Power supply system and electric apparatus mounting it

The present invention relates to a power supply system and an electric device equipped with the power supply system, and more particularly to a power supply system for supplying drive power to a device capable of operating in a normal operating state and a standby operating state, and an electric device equipped with the power supply system.

Electric devices such as televisions and stereos are configured so that the main power can be turned on / off with a remote controller or the like. Therefore, in the electric device, the minimum necessary circuit is in an operating state so that the main power can be turned on by the main power on operation by the remote controller even after the main power is turned off. This state is called the standby operating state. Therefore, it was necessary to supply power in order to operate the minimum necessary circuit even in the standby operating state.

The power supply during standby operation and the standby power supply have a smaller current supply capacity than the main power supply supplied during normal operation. Therefore, when the main power supply is used for the standby operation, wasteful power is consumed in the power supply device due to the conversion efficiency of the transformer and the like.

In order to reduce waste of power consumption during standby operation, a switching element is connected to the transformer and the load current is detected to detect that it is during standby operation, and by controlling the switching element during standby operation. There was a power supply device that reduced power consumption by operating the transformer intermittently (see Patent Document 1).

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2001-145354</text></patcit>

<p> However, if the power supply capacity of the power supply device is large, the basic loss of the device becomes large. Therefore, even if the power consumption of the standby operation of the electric device is reduced, the power consumption of the power supply device cannot be sufficiently reduced, and thus the reduction of the power consumption during the standby operation is suppressed. Further, as the power consumption during the standby operation of the electric device decreases, the loss of the power supply device appears to be relatively large.</p><p> The present invention has been made in view of the above points, and an object of the present invention is to provide a power supply system capable of significantly reducing power consumption during standby and an electric device equipped with the same.</p>

<p> According to the present invention, in a power supply system that supplies drive power to a device (13) that can operate in a normal operating state and a standby operating state, a main power source that generates a main power source that normally operates the device (13) is generated from an input power source. The power supply unit (12) and the main power supply unit (12) are independent units, and the power supply capacity is lower than that of the main power supply unit (12). A standby power supply (10) that generates power and an input power supply (12) that supplies input power to the main power supply (12) when the equipment is in normal operating state, and an input power supply main power supply (12) when the equipment (13) is in standby operation. ) Is provided with a switching means (11) for stopping the supply to the).</p><p> The standby power supply device (10) is characterized in that it is composed of a switching regulator type power supply circuit. Further, the standby power supply device (10) is characterized in that the power supply capacity is 0.1 watt or less. Further, the standby power supply device (10) is detachably mounted by a connector (CN).</p><p> Further, the present invention is characterized in that the above-mentioned power supply system is mounted on an electric device.</p><p> The reference symbols in parentheses are provided for easy understanding, and are merely examples, and the scope of claims is not limited by the reference numerals.</p>

<p> According to the present invention, when the device enters the standby operation state, the supply of input power to the main power supply is stopped by the operation switching means, and the unit is made independent of the main power supply device and has a lower power supply capacity than the main power supply device. At least during the standby operation of the equipment, the standby power is supplied to the equipment from the input power supply by the standby power supply that enables the equipment to operate in standby, so the power consumption during standby of the electrical equipment is significantly reduced. Can be done. Further, the standby power supply device is a device independent of the main power supply device and can generate a standby power supply from the input power supply, so that it can be easily mounted in various systems.</p>

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a system configuration diagram of an embodiment of the present invention.

The system 1 of this embodiment is composed of a standby power supply device 10, a switching device 11, a main power supply device 12, and an electric device main body 13.

The standby power supply device 10 is formed on a printed wiring board (PWB) independent of the main power supply device 12, is configured as an independent unit, and can be connected to an AC100V input power supply and an electric device main body 13 by a connector CN. There is. The standby power supply device 10 generates a standby power supply having a predetermined DC voltage from an input power supply of AC100V.

FIG. 2 shows a block configuration diagram of the standby power supply device 10.

The standby power supply device 10 is composed of a rectifying and smoothing circuit 20, a switching unit 21, a transformer 22, a rectifying and smoothing circuit 23, a voltage detection circuit 24, a photocoupler 25, and a control circuit 26, and constitutes a so-called switching regulator type power supply circuit. ing.

An input power supply of AC100V is supplied to the rectifying smoothing circuit 20. The rectifying / smoothing circuit 20 rectifies and smoothes the AC100V input power supply and supplies it to the switching unit 21. The switching unit 21 is switched according to the switching pulse from the control circuit 26, and controls the supply of the direct current rectified and smoothed by the rectified and smoothed circuit 20 to the transformer 22.

In the transformer 22, the switching unit 21 controls the current flowing through the primary coil L1, thereby controlling the voltage generated through the secondary coil L2. The voltage generated in the secondary coil L2 is supplied to the rectifying smoothing circuit 23. The rectifying / smoothing circuit 23 rectifies and smoothes the voltage generated in the secondary coil L2 of the transformer 22 and outputs it as a standby power supply. The standby power supply is supplied to the electric device main body 13. The standby power supply is used inside the main body 13 of the electric device to drive a circuit that requires power supply during standby operation.

For example, in the main power supply device 12, the power consumption of the device itself is about 5 W even when there is no load. On the other hand, the standby power supply device 10 can reduce the power consumption of the device itself to 0.1 W or less even in the standby state.

At least the microcomputer 14 and the light receiving element 16 are built in the electric device main body 13. The microcomputer 14, the light receiving element 16, and the like built in the power supply device main body 13 need to detect the operation from the remote controller 15 during the standby operation, and correspond to a circuit that requires standby power supply.

The light receiving element 16 receives infrared rays from the remote controller 15 and supplies an electric signal corresponding to the received infrared rays to the microcomputer 14. The microcomputer 14 analyzes the electric signal supplied from the light receiving element 16 and controls the operation of the switching device 11 and other circuits inside the electric device main body 13 according to the operation of the remote controller 15.

The voltage detection circuit 24 detects the output voltage of the rectifying and smoothing circuit 23, and causes the light emitting diode 25a of the photocoupler 25 to emit light according to the output voltage level of the rectifying and smoothing circuit 23. In the photocoupler 25, a phototransistor 25b is arranged so as to face the light emitting diode 25a, and a current corresponding to the amount of light emitted from the light emitting diode 25a is drawn from the collector.

The phototransistor 25b constituting the photocoupler 25 is connected to the control circuit 26. The control circuit 26 controls the pulse width of the switching pulse supplied to the switching unit 21 according to the current drawn from the phototransistor 25b of the photocoupler 25.

In the control circuit 26, when the output voltage of the rectifying and smoothing circuit 23 becomes large, the period for passing a current through the primary coil L1 becomes short, and when the output voltage of the rectifying and smoothing circuit 23 becomes small, the period for passing a current through the primary coil L1 becomes short. The pulse width of the switching pulse supplied to the switching unit 21 is controlled so as to be longer. As a result, the output voltage of the rectifying / smoothing circuit 23 is controlled to be constant.

At this time, the standby power supply device 10 only needs to be able to supply electric power of 0.1 W or less, the voltage fluctuation is small, and the load is a microcomputer or the like, so that the output voltage can be lowered. Therefore, the characteristics and withstand voltage of the elements such as the transformer 22 are determined with a lower power supply capacity than that of the main power supply device 12.

For example, the capacitances of the rectifying and smoothing circuits 20 and 23 are smaller than those of the main power supply device 12. Further, the transformer 22 is made smaller than the main power supply device 12. Further, as the transistor, the photocoupler 25, and the like constituting the switching unit 21, parts having a small withstand voltage and the like are used.

The switching device 11 is composed of a relay or the like, and input power is supplied to one end thereof, and the other end is connected to the main power supply device 12. The switching device 11 turns on / off the connection between one end and the other end in response to an instruction from the microcomputer 14 built in the electric device main body 13.

The main power supply device 12 is composed of, for example, a switching regulator type power supply circuit, and is sufficient to drive the electric device main body 13 in a normal operating state when the switching device 11 is turned on and input power is supplied. Generates power and supplies it to the electrical equipment body 13. Further, since the main power supply device 12 supplies power during the normal operation of the electric device main body 13, it is necessary to cope with a relatively large load. Therefore, for example, the capacitance of the rectifying / smoothing circuit is larger than that of the standby power supply device 10. In addition, the transformer is larger than the standby power supply device 10. Further, a transistor having a large withstand voltage and the like is also used for a transistor constituting a switching unit for switching the current flowing through the primary coil of the transformer, a photocoupler for feeding back, and the like.

The main power source generated by the main power supply device 12 is supplied to the electric device main body 13. The main power supply from the main power supply device 12 is supplied to at least the microcomputer 14 of the electric device main body 13 and other circuits except the light receiving element 16. Except for at least the microcomputer 14 and the light receiving element 16 of the electric device main body 13, other circuits are driven by the main power supply from the main power supply device 12.

Next, the operation of the system 1 will be described.

FIG. 3 is an operation explanatory view of an embodiment of the present invention. FIG. 3 (A) shows the system state when the electric device main body 13 is in normal operation, and FIG. 3 (B) shows the system state when the electric device main body 13 is in standby operation.

During normal operation, as shown in FIG. 3A, the switching device 11 is turned on and input power is supplied to both the standby power supply device 10 and the main power supply device 12. As a result, the standby power generated by the standby power supply device 10 is supplied to the microcomputer 14 of the electric device main body 13, and the main power generated by the main power supply device 12 is at least the microcomputer 14 of the electric device main body 13 and the microcomputer 14 and the like. It is supplied to other circuits except the light receiving element 16.

As a result, the electric device main body 13 is in the main power-on state, and normal operation is performed. At this time, the standby power supply is supplied to the microcomputer 14 from the standby power supply device 10, and the operation of the remote controller 15 can be recognized. Therefore, the electric device main body 13 can be operated by operating the remote controller 15.

Here, when the main power supply is instructed to be turned off by the operation of the remote controller 15, the microcomputer 14 turns off the switching device 11 as shown in FIG. 3 (B). When the switching device 11 is turned off, the input power is not supplied to the main power supply device 12. The main power supply device 12 stops generating the main power supply when the input power supply is no longer supplied. Therefore, the main power supply is not supplied to the electric device main body 13.

Since the input power supply is supplied to the standby power supply device 10 regardless of the state of the switching device 11, the standby power supply device 10 continues to generate the standby power supply. Therefore, even if the switching device 11 is turned off, the standby power supply is supplied to the microcomputer 14 and the like of the electric device main body 13.

According to this embodiment, when the electric device main body 13 is put into the standby operation state by the operation of the remote controller 15 or the like, the operation of the main power supply device 12 is stopped, and the unit is made independent of the main power supply device 12 and is the main. By supplying the standby power supply to the electric device main body 13 by the standby power supply device 13 having a configuration having a lower power supply capacity than the power supply device 12, the power consumption in the power supply device can be significantly reduced.

Further, the standby power supply device 10 is unitized, is formed as a unit separate from the main power supply device 12, and is easily attached to and detached from the connector CN. Therefore, it can be easily mounted on an existing electric device on which the main power supply device 12 is mounted. In addition, it can be easily replaced in the event of a failure, and is excellent in maintainability.

<figref num="1">It is a system block diagram of one Example of this invention.</figref><figref num="2">It is a block block diagram of the standby power supply device 10.</figref><figref num="3">It is operation explanatory drawing of one Example of this invention.</figref>

Code description

1 System 10 Standby power supply 11 Switching unit 12 Main power supply unit 13 Electrical equipment body 14 Microcomputer 15 Remote control 16 Receiver 20 Rectifier smoothing circuit 21 Switching unit 22 Transformer 23 Rectifier smoothing circuit 24 Voltage detection circuit 25 Photocoupler 25a Light emitting diode 25b Phototransistor 26 Control circuit CN connector