Control device of air-conditioner

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a control device for an air conditioner, and more particularly to a control method for safely and surely stopping a compressor when a high pressure on the discharge side of the compressor becomes abnormal.

【0002】

[Conventional technology]

In an air conditioner in which a compressor is driven by an inverter, if some abnormal state occurs, the high pressure of the refrigerant on the discharge side of the compressor may rise abnormally. Therefore, in order to solve such a problem, for example, a control device for an air conditioner (manufactured by Mitsubishi Electric, model PURY-250M-A) as shown in FIG. 14 has been developed. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. Coolant piping, 8 is a forward conversion means that rectifies a 3-phase input AC power supply to DC, 9 is a reverse conversion means that converts the output voltage from the forward conversion means 8 to AC, 10 is a variable voltage and variable to the reverse conversion means 9. Inverse converter control means that outputs command signals related to frequency, 11 is high-pressure pressure detection means that detects high-pressure pressure on the discharge side of compressor 1, and 17 is flat DC voltage waveform including pulsation from forward conversion means 8. Smoothing means that converts to voltage, 13 is an inrush current prevention means that limits the charging current to the smoothing means 17 when the power is turned on, 20 is a microcomputer that calculates and outputs a control signal to the inverse conversion means 9 by software processing, 21 is It is a 3-phase input AC power supply.

【0003】

In the conventional device having the above configuration, when the high pressure on the discharge side of the compressor 3 becomes equal to or higher than a predetermined value considered to be abnormal while the pressure signal from the high pressure pressure detecting means 11 is being input to the microcomputer 20, the microcomputer Within 20, the abnormal state of high pressure pressure is determined by the software function, and the control signal output from the inverse converter control means 10 is stopped by software processing. As a result, the output to the inverse conversion means 9 is stopped, and as a result, the compressor 3 is stopped.

【0004】

[Problems to be Solved by the Invention]

Since the control device of the conventional air conditioner is configured as described above, the following problems are inherent. That is, since the high-pressure pressure abnormal state determination process and the inverter control signal output stop process were performed by the software function in the microcomputer 20, the high-pressure pressure detection means 11 and the microcomputer 20 itself malfunction due to the influence of external noise and the like. There was a risk of accidental stoppage of the compressor 3 or stop delay.

【0005】

[Means for solving problems]

The present invention has been made to solve the above problems of the prior art, and the first invention is from a forward conversion means for rectifying a three-phase input AC power supply to direct current and a forward conversion means. It is equipped with a power supply circuit that has an inverse conversion means that converts output power to alternating current and an inverse converter control means that outputs command signals related to variable voltage and variable frequency to the inverse conversion means, and is installed in an air conditioner. The refrigerant detected by the high-pressure pressure detecting means in the control device that drives and controls the compressor by the power supply circuit based on the high-pressure pressure of the refrigerant detected by the high-pressure pressure detecting means on the compressor discharge side of the refrigerant circuit. It is provided with an opening / closing means for opening / closing the power supply circuit and stopping the power supply to the compressor when the high-voltage pressure exceeds a predetermined value related to the high-voltage abnormal state.

【0006】

The second invention also includes a forward conversion means for rectifying a three-phase input AC power supply to direct current, an inverse conversion means for converting an output power supply from the forward conversion means to alternating current, and a control signal output means. A power supply circuit having a reverse converter control means that amplifies a command signal related to a variable voltage and a variable frequency from an output means with an amplifier and outputs the command signal to the reverse conversion means is provided, and a refrigerant deployed in an air conditioner is provided. In a control device that drives and controls the compressor by a power supply circuit based on the high-voltage pressure of the refrigerant detected by the high-voltage pressure detecting means on the discharge side of the compressor of the circuit, the amplifier is configured by the current amplification means with an output cutoff function. When the high-voltage pressure of the refrigerant detected by the high-voltage pressure detecting means exceeds the predetermined value related to the high-voltage abnormal state, the current amplification means with an output cutoff function cuts off the command signal from the control signal output means to supply power to the compressor. The supply is stopped.

【0007】

The third invention has a forward conversion means for rectifying a three-phase input AC power supply to direct current, an inverse conversion means for converting an output power supply from the forward conversion means to AC, and a control signal output means. A power supply circuit having an inverse converter control means for outputting a command signal related to a variable voltage and a variable frequency from an output means to the inverse conversion means is provided, and a compressor discharge of a refrigerant circuit installed in an air conditioner is provided. In a control device that drives and controls a compressor by a power supply circuit based on the high-pressure pressure of the refrigerant detected by the high-pressure pressure detecting means on the side, the control signal output means is configured by the control signal output means with a reset function, and the high-pressure pressure. When the high-pressure pressure of the refrigerant detected by the detection means exceeds the predetermined value related to the high-pressure abnormal state, the control signal output means with a reset function cuts off the command signal from the control signal output means to supply power to the compressor. It is designed to be stopped so that it can be reset.

【0008】

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention 1. FIG. 1 is a circuit block diagram of a control device for an air conditioner according to claim 1 of the present invention. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means for rectifying the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means for converting the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Reverse converter control means that outputs a command signal related to variable frequency to reverse conversion means 9, 11 is a pressure switch type high pressure detection means that detects the high voltage on the discharge side of the compressor 1, and 12 is a 3-phase input AC power supply 21. An opening / closing means provided between the and forward conversion means 8, 13 is an inrush current prevention means provided in parallel with any two of the three opening / closing means 12, 16 is a control signal output means composed of, for example, a microcomputer, 17 Is a smoothing means that converts a voltage waveform including pulsation from the forward conversion means 8 into a flat DC voltage, and 22 is a power supply circuit consisting of a forward conversion means 8, an inverse conversion means 9, an inverse converter control means 10, and the like. .. Here, the inrush current preventing means 13 limits the charging current to the smoothing means 17 when the power is turned on. In addition, the opening / closing means 12 employs a highly reliable mechanical opening / closing mechanism with excellent operating characteristics, component life, and durability, one for each of the three power lines from the three-phase input AC power supply 21. A total of three are deployed. Further, the drive power line from the high pressure pressure detecting means 11 is connected to each opening / closing means 12.

【0009】

In the control device of the first embodiment, the high pressure pressure on the discharge side of the compressor 3 is a predetermined value related to an abnormal state (a value mechanically set in the high pressure pressure detecting means 11 for the pressure switch in advance. Each of the following embodiments When the above is achieved, the drive power from the high-voltage pressure detecting means 11 is supplied to the opening / closing means 12 to open the opening / closing means 12 in the power supply circuit 22 for supplying power to the control device. Mechanically shut off certain components. As a result, the output to the inverse conversion means 9 is stopped. As a result, the compressor 3 can be stopped safely and surely.

【0010】

That is, according to this control method, the inrush current prevention circuit by the opening / closing means 12 and the inrush current prevention means 13 required in the device in which the smoothing means 17 is provided between the forward conversion means 8 and the reverse conversion means 9 is used. By doing so, the purpose was achieved.

【0011】

Embodiment 2. FIG. 2 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means for rectifying the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means for converting the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Reverse converter control means that outputs a command signal related to variable frequency to reverse conversion means 9, 11 is a pressure switch type high pressure detection means that detects the high pressure on the discharge side of the compressor 1, and 12 is a 3-phase input AC power supply 21. A total of two opening / closing means are provided for three power lines between the forward conversion means 8 and the forward conversion means 8, 16 is a control signal output means, and 17 is a conversion of a voltage waveform including pulsation from the forward conversion means 8 into a flat DC voltage. The smoothing means, 13 is provided in parallel with each of the two opening / closing means 12, and the inrush current preventing means for limiting the charging current to the smoothing means 17 when the power is turned on, 22 is the forward conversion means 8, the reverse conversion means 9, and the reverse converter. It is a power supply circuit including control means 10 and the like. Each of the opening / closing means 12 is composed of a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the drive power line from the high pressure pressure detecting means 11 is connected to each opening / closing means 12.

【0012】

In the control device of the second embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, the drive power from the high pressure pressure detecting means 11 is supplied to the opening / closing means 12 to open the opening / closing means 12 to the control device. The power supply is mechanically cut off. As a result, the output to the inverse conversion means 9 is stopped. As a result, the compressor 3 can be stopped safely and surely.

【0013】

That is, according to this control method, the inrush current prevention circuit by the opening / closing means 12 and the inrush current prevention means 13, which is necessary for the equipment in which the smoothing means 17 is provided between the forward conversion means 8 and the reverse conversion means 9, is used. By doing so, I was able to achieve my goal. Further, as compared with the first embodiment, the number of opening / closing means 12 can be reduced from three to two, so that cost reduction and space saving in the apparatus can be realized.

【0014】

Embodiment 3. FIG. 3 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means for rectifying the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means for converting the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Reverse converter control means that outputs a command signal related to a variable frequency to reverse conversion means 9, 11 is a pressure switch type high-voltage pressure detection means that detects the high-voltage pressure on the discharge side of the compressor 1, and 12 is a 3-phase input AC power supply 21. An opening / closing means provided for three power lines between the forward conversion means 8 and the control signal output means, 17 is a smoothing that converts a voltage waveform including pulsation from the forward conversion means 8 into a flat DC voltage. Means, 13 are rush current prevention means, which are provided in parallel with any one of the two opening / closing means 12, and limit the charging current to the smoothing means 17 when the power is turned on. 22 are forward conversion means 8 and reverse conversion means 9. It is a power supply circuit including the reverse converter control means 10 and the like. Each of the opening / closing means 12 is composed of a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the drive power line from the high pressure pressure detecting means 11 is connected to each opening / closing means 12.

【0015】

In the control device of the third embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, the drive power from the high pressure pressure detecting means 11 is supplied to the opening / closing means 12 to open the opening / closing means 12 to the control device. The power supply is mechanically cut off. Therefore, since the output to the inverse conversion means 9 is stopped, the compressor 3 can be stopped safely and surely.

【0016】

That is, according to this control method, the inrush current prevention circuit by the opening / closing means 12 and the inrush current prevention means 13, which is necessary for the equipment in which the smoothing means 17 is provided between the forward conversion means 8 and the reverse conversion means 9, is used. By doing so, I was able to achieve my goal. Further, as compared with the first embodiment, the number of opening / closing means 12 can be reduced to two for every three, and the number of inrush current preventing means 13 can be reduced to one for every two, so that cost reduction and space saving can be further realized.

【0017】

Embodiment 4. FIG. 4 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means that rectifies the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means that converts the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Reverse converter control means that outputs a command signal related to variable frequency to reverse conversion means 9, 11 is a pressure switch type high pressure pressure detection means that detects high pressure on the discharge side of compressor 1, and 12 is smooth with forward conversion means 8. The opening / closing means provided between the means 17, 16 is the control signal output means, 17 is the smoothing means for converting the voltage waveform including the pulsation from the forward conversion means 8 into a flat DC voltage, and 13 is the opening / closing means 12 in parallel. A power supply circuit is provided, which is provided with an inrush current preventing means for limiting the charging current to the smoothing means 17 when the power is turned on, and 22 is a power supply circuit including a forward conversion means 8, a reverse conversion means 9, a reverse converter control means 10, and the like. The opening / closing means 12 includes a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the drive power line from the high pressure pressure detecting means 11 is connected to each opening / closing means 12.

【0018】

In the control device of the fourth embodiment, when the high-voltage pressure becomes equal to or higher than a predetermined value, the drive power from the high-voltage pressure detecting means 11 is supplied to the opening / closing means 12 to open the opening / closing means 12, thereby causing the inverse conversion means 9 to open. Input to is blocked. As a result, the compressor 3 can be stopped safely and surely.

【0019】

That is, according to this control method, the inrush current prevention circuit by the opening / closing means 12 and the inrush current prevention means 13, which is necessary for the equipment in which the smoothing means 17 is provided between the forward conversion means 8 and the reverse conversion means 9, is used. By doing so, I was able to achieve my goal. Further, as compared with the first embodiment, the number of opening / closing means 12 can be reduced to one for every three, and the number of inrush current prevention means 13 can be reduced to one for every two, so that further cost reduction and space saving are realized. it can.

【0020】

Embodiment 5. FIG. 5 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means that rectifies the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means that converts the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Reverse converter control means that outputs a command signal related to variable frequency to reverse conversion means 9, 11 is a pressure switch type high pressure detection means that detects high pressure on the discharge side of compressor 1, and 12 is reverse conversion means 9 and compression. A total of three opening / closing means, one for each of the three power lines between the machines 3, 16 is the control signal output means, and 17 is the flat DC voltage that includes the pulsation from the forward conversion means 8. The smoothing means 13 is provided between the forward conversion means 8 and the reverse conversion means 9, and the inrush current prevention means that limits the charging current to the smoothing means 17 when the power is turned on, 22 is the forward conversion means 8 and the reverse conversion means. It is a power supply circuit consisting of 9 and an inverse converter control means 10. Each of the opening / closing means 12 is composed of a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the drive power line from the high pressure pressure detecting means 11 is connected to each of the opening / closing means 12 described above.

【0021】

According to the control device of the fifth embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, the drive power from the high pressure pressure detecting means 11 is supplied to the opening / closing means 12 to open the opening / closing means 12, thereby opening the compressor. The power input to 3 is cut off. As a result, the compressor 3 can be stopped safely and surely.

【0022】

Embodiment 6. FIG. 6 is a circuit block diagram of a control device for an air conditioner according to claim 2. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. The refrigerant pipe forming the refrigerant circuit, 8 is the forward conversion means for rectifying the 3-phase input AC power supply 21 to DC, 9 is the reverse conversion means for converting the output power supply from the forward conversion means 8 to AC, 10 is the variable voltage and Reverse converter control means that outputs a command signal related to a variable frequency to reverse conversion means 9, 11 is a pressure switch type high pressure detection means that detects the high pressure on the discharge side of the compressor 1, 16 is a control signal output means, 14 Is a current amplification means with an output cutoff function provided between the control signal output means 16 and the photocoupler 23 in the inverse converter control means 10, and 17 is a flat DC voltage with a voltage waveform including pulsation from the forward conversion means 8. The smoothing means 13 is provided between the forward conversion means 8 and the reverse conversion means 9, and the inrush current prevention means that limits the charging current to the smoothing means 17 when the power is turned on, 22 is the forward conversion means 8 and the reverse conversion means. It is a power supply circuit consisting of 9 and an inverse converter control means 10. The current amplification means 14 with an output cutoff function is composed of highly reliable electric components having excellent operating characteristics, component life, and durability. Further, a driving signal line from the high-voltage pressure detecting means 11 (which supplies a low-voltage power source for protecting the control device; the same applies hereinafter) is connected to the current amplifying means 14 with an output cutoff function.

【0023】

According to the control device of the sixth embodiment, when the high-pressure pressure of the refrigerant detected by the high-pressure pressure detecting means 11 exceeds a predetermined value related to the high-pressure abnormal state, the reset signal from the high-pressure pressure detecting means 11 has an output cutoff function. When the current amplification means 14 is input to the current amplification means 14, the current amplification means 14 with an output cutoff function cuts off the command signal from the control signal output means 16 to the photocoupler 23. Therefore, the power supply to the compressor 3 is stopped. As a result, the compressor 3 can be stopped safely and surely.

【0024】

Embodiment 7. FIG. 7 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means that rectifies the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means that converts the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and An inverse converter control means that outputs a command signal related to a variable frequency to an inverse conversion means 9, 11 is a pressure switch type high pressure pressure detecting means that detects a high pressure on the discharge side of the compressor 1, and 12 is an inverse converter control means 10. An opening / closing means provided between the control power supply 24 and the photocoupler 23, 16 is a control signal output means, and 17 is a smoothing means for converting a voltage waveform including pulsation from the forward conversion means 8 into a flat DC voltage. 13 is an inrush current prevention means provided between the forward conversion means 8 and the reverse conversion means 9 to limit the charging current to the smoothing means 17 when the power is turned on, and 22 is the forward conversion means 8 and the reverse conversion means 9 and the reverse converter control. It is a power supply circuit composed of means 10 and the like. The opening / closing means 12 includes a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the driving signal line from the high pressure pressure detecting means 11 is connected to the opening / closing means 12.

【0025】

According to the control device of the seventh embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, a drive signal from the high pressure pressure detecting means 11 is input to the opening / closing means 12 to open the opening / closing means 12, thereby opening the control signal. The output of the control signal from the output means 16 is cut off. As a result, the output to the inverse conversion means 9 can be stopped. As a result, the compressor 3 can be stopped safely and surely.

【0026】

8. FIG. 8 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means that rectifies the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means that converts the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and An inverse converter control means that outputs a command signal related to a variable frequency to an inverse conversion means 9, 11 is a pressure switch type high pressure pressure detecting means that detects a high pressure on the discharge side of the compressor 1, and 12 is an inverse converter control means 10. The opening / closing means provided in parallel with the light emitting element of the photocoupler 23, 16 is the control signal output means, 17 is the smoothing means for converting the voltage waveform including the pulsation from the forward conversion means 8 into a flat DC voltage, and 13 is the smoothing means. The inrush current prevention means provided between the forward conversion means 8 and the reverse conversion means 9 and limiting the charging current to the smoothing means 17 when the power is turned on, 22 is the forward conversion means 8, the reverse conversion means 9, and the reverse converter control means 10. It is a power supply circuit consisting of such as. The opening / closing means 12 includes a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the driving signal line from the high pressure pressure detecting means 11 is connected to the opening / closing means 12.

【0027】

According to the control device of the eighth embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, a drive signal from the high pressure pressure detecting means 11 is input to the opening / closing means 12 to close the opening / closing means 12, thereby closing the photocoupler 23. The output of the control signal from the control signal output means 16 can be cut off by bypassing the current to. As a result, the output to the inverse conversion means 9 is stopped. As a result, the compressor 3 can be stopped safely and surely.

【0028】

Embodiment 9. FIG. 9 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means that rectifies the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means that converts the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and An inverse converter control means that outputs a command signal related to a variable frequency to an inverse conversion means 9, 11 is a pressure switch type high pressure pressure detecting means that detects a high pressure on the discharge side of the compressor 1, and 12 is an inverse converter control means 10. An opening / closing means provided between the light emitting element of the photocoupler 23 and the microcomputer 25, 16 is a control signal output means, and 17 is a smoothing means for converting a voltage waveform including pulsation from the forward conversion means 8 into a flat DC voltage. , 13 are rush current prevention means provided between the forward conversion means 8 and the reverse conversion means 9 to limit the charging current to the smoothing means 17 when the power is turned on, and 22 are the forward conversion means 8 and the reverse conversion means 9 and the reverse converter. It is a power supply circuit including control means 10 and the like. The opening / closing means 12 includes a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the driving signal line from the high pressure pressure detecting means 11 is connected to the opening / closing means 12.

【0029】

According to the control device of the ninth embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, a drive signal from the high pressure pressure detecting means 11 is input to the opening / closing means 12 to open the opening / closing means 12, thereby opening the control signal. The control signal output from the output means 16 is cut off. As a result, the output to the inverse conversion means 9 is stopped. As a result, the compressor 3 can be stopped safely and surely.

【0030】

Embodiment 10. FIG. 10 is a circuit block diagram of a control device for an air conditioner according to claim 3. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means that rectifies the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means that converts the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Reverse converter control means that outputs a command signal related to variable frequency to reverse conversion means 9, 11 is a pressure switch type high pressure detection means that detects the high pressure on the discharge side of the compressor 1, and 12 is a 3-phase input AC power supply 21. An opening / closing means provided between the and forward conversion means 8, 16 is a control signal output means, 17 is a smoothing means for converting a voltage waveform including pulsation from the forward conversion means 8 into a flat DC voltage, and 13 is a forward conversion means. An inrush current prevention means provided between 8 and the reverse conversion means 9 that limits the charging current to the smoothing means 17 when the power is turned on, 18 is a control signal output means with a reset function provided in the reverse converter control means 10, 22 Is a power supply circuit including forward conversion means 8, reverse conversion means 9, reverse converter control means 10, and the like. The control signal output means 18 with a reset function has excellent operating characteristics, component life, and durability, and is highly reliable. Further, the drive signal line from the high pressure pressure detecting means 11 is connected to the control signal output means 18 with a reset function.

【0031】

In the control device of the tenth embodiment, when the high pressure pressure of the refrigerant detected by the high pressure pressure detecting means 11 exceeds a predetermined value related to the high pressure abnormal state, a reset signal from the high pressure pressure detecting means 11 is input. The control signal output means 18 with a reset function stops its own command signal output. As a result, the output to the inverse conversion means 9 is stopped. As a result, the compressor 3 can be safely and reliably stopped in addition to being resettable. Then, after the reset operation, the compressor 3 can be restarted and if normal, the operation can be continued.

【0032】

Embodiment 11. FIG. 11 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means for rectifying the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means for converting the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Inverse converter control means that outputs a command signal related to a variable frequency to the inverse conversion means 9, 11 is a pressure switch type high pressure detection means that detects the high pressure on the discharge side of the compressor 1, and 12 is the inverse converter control means 10. Opening / closing means provided between the signal wiring connecting the transistors 26 and 27 in the reverse conversion means 9 and the transistor / diode set 29 in the reverse conversion means 9 and the ground 28, 16 is the control signal output means, and 17 is the pulsation from the forward conversion means 8. Smoothing means for converting a voltage waveform including the above into a flat DC voltage, 13 is an inrush current preventing means provided between the forward conversion means 8 and the reverse conversion means 9 to limit the charging current to the smoothing means 17 when the power is turned on. Reference numeral 22 denotes a power supply circuit including the forward conversion means 8, the reverse conversion means 9, the reverse converter control means 10, and the like. The opening / closing means 12 includes a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the driving signal line from the high pressure pressure detecting means 11 is connected to the opening / closing means 12.

【0033】

According to the control device of the eleventh embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, a drive signal from the high pressure pressure detecting means 11 is input to the opening / closing means 12 to close the opening / closing means 12, thereby closing the inverse converter. The control signal output from the control means 10 is cut off. As a result, the output to the inverse conversion means 9 is stopped. As a result, the compressor 3 can be stopped safely and surely.

【0034】

Embodiment 12. FIG. 12 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means that rectifies the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means that converts the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and An inverse converter control means that outputs a command signal related to a variable frequency to an inverse conversion means 9, 11 is a pressure switch type high pressure pressure detecting means that detects a high pressure on the discharge side of the compressor 1, and 12 is an inverse converter control means 10. The switching means provided in parallel between the two signal wirings connected to the reverse conversion means 9, 16 is the control signal output means, and 17 is the flat DC voltage including the pulsation from the forward conversion means 8. The smoothing means 13 is provided between the forward conversion means 8 and the reverse conversion means 9, and the inrush current prevention means that limits the charging current to the smoothing means 17 when the power is turned on, 22 is the forward conversion means 8 and the reverse conversion means. It is a power supply circuit consisting of 9 and an inverse converter control means 10. The opening / closing means 12 includes a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the driving signal line from the high pressure pressure detecting means 11 is connected to the opening / closing means 12.

【0035】

According to the control device of the twelfth embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, a drive signal from the high pressure pressure detecting means 11 is input to the opening / closing means 12 to close the opening / closing means 12, thereby closing the inverse converter. The control signal output from the control means 10 is cut off. Therefore, the output to the inverse conversion means 9 is stopped. As a result, the compressor 3 can be stopped safely and surely.

【0036】

Embodiment 13. FIG. 13 is a circuit block diagram of a control device for an air conditioner according to claim 1. In the figure, 1 is an outdoor unit, 2 is an indoor unit, 3 is a compressor, 4 is an outdoor unit heat exchanger, 5 is an indoor unit heat exchanger, 6 is a throttle device, and 7 is an outdoor unit 1 and an indoor unit 2. 8 is a forward conversion means for rectifying the 3-phase input AC power supply 21 to DC, 9 is a reverse conversion means for converting the output power supply from the forward conversion means 8 to AC, 10 is a variable voltage and Reverse converter control means that outputs a command signal related to variable frequency to reverse conversion means 9, 11 is a pressure switch type high pressure detection means that detects the high pressure on the discharge side of the compressor 1, and 12 is a 3-phase input AC power supply 21. The opening / closing means provided between the and forward conversion means 8, 16 is the control signal output means, 17 is the smoothing means for converting the voltage waveform including the pulsation from the forward conversion means 8 into a flat DC voltage, and 13 is the smoothing means 17. A power supply consisting of a forward conversion means 8, a reverse conversion means 9, a reverse converter control means 10, and the like, which is provided between the reverse conversion means 9 and the inrush current prevention means for limiting the charging current to the smoothing means 17 when the power is turned on. It is a supply circuit. The opening / closing means 12 includes a highly reliable mechanical opening / closing mechanism having excellent operating characteristics, component life, and durability. Further, the drive power line from the high pressure pressure detecting means 11 is connected to the opening / closing means 12.

【0037】

According to the control device of the thirteenth embodiment, when the high pressure pressure becomes equal to or higher than a predetermined value, a drive signal from the high pressure pressure detecting means 11 is supplied to the opening / closing means 12 to open the opening / closing means 12, thereby causing the inverse conversion means. The power input to 9 is cut off. As a result, the compressor 3 can be stopped safely and surely.

【0038】

[Effect of the invention]

As described in detail above, the present invention has the following effects. According to the invention of claim 1, when the high pressure of the refrigerant on the discharge side of the compressor becomes abnormal, the power supply circuit is opened and closed by the opening / closing means to stop the power supply to the compressor. Therefore, the compressor can be stopped safely and surely. Further, this opening / closing means is excellent in operating characteristics, component life, or durability, and can provide a highly reliable control device.

【0039】

Then, in the invention according to claim 2, when the high pressure of the refrigerant on the discharge side of the compressor becomes abnormal, the command signal from the control signal output means is cut off by the current amplification means with an output cutoff function to the compressor. Since the power supply of the compressor is stopped, the compressor can be stopped safely and surely.

【0040】

Further, according to the third aspect of the present invention, when the high pressure of the refrigerant on the discharge side of the compressor becomes abnormal, the control signal output means with a reset function blocks the command signal from the control signal output means to compress the compressor. Since the power supply to the machine is stopped in a resettable manner, the compressor can be stopped safely and surely. Then, after the reset operation, it is possible to restart and continue the operation if it is normal.

[Simple explanation of drawings]

[Figure 1]

It is a block diagram of Embodiment 1 in this invention.

[Figure 2]

It is a block diagram of Embodiment 2 in this invention.

[Fig. 3]

It is a block diagram of Embodiment 3 in this invention.

[Fig. 4]

It is a block diagram of Embodiment 4 in this invention.

[Fig. 5]

It is a block diagram of Embodiment 5 in this invention.

[Fig. 6]

It is a block diagram of Embodiment 6 in this invention.

[Fig. 7]

It is a block diagram of Embodiment 7 in this invention.

[Fig. 8]

It is a block diagram of Embodiment 8 in this invention.

[Fig. 9]

It is a block diagram of Embodiment 9 in this invention.

[Fig. 10]

It is a block diagram of Embodiment 10 in this invention.

[Fig. 11]

It is a block diagram of Embodiment 11 in this invention.

[Fig. 12]

It is a block diagram of Embodiment 12 in this invention.

[Fig. 13]

It is a block diagram of Embodiment 13 in this invention.

[Fig. 14]

It is a block diagram of a conventional example.

[Explanation of symbols]

3 Compressor, 8 Forward conversion means, 9 Reverse conversion means, 10 Reverse converter control means, 11 High voltage pressure detection means, 12 Open / close means, 14 Current amplification means with output cutoff function, 16 Control signal output means, 18 With reset function Control signal output means, 213 phase input AC power supply, 22 power supply circuit.