Apparatus for stopping power supply

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a power supply stop device, and more specifically, a power supply stop device that determines whether a variable power supply and a product that supplies the variable power supply are appropriate and controls so that an abnormal voltage is not applied to the product. It is about.

【0002】

[Conventional technology]

As a conventional technique, a power supply stop device for detecting an abnormality by an induced voltage caused by an electric leakage or the like in an emergency such as an earthquake or a seismic sensor that senses vibration or shock is disclosed in Japanese Patent Application Laid-Open No. 8-242531. .. Further, as disclosed in Japanese Patent Application Laid-Open No. 9-104239, many power supply stop devices specialized for a particularly dangerous battery portion of an electric vehicle or the like have been proposed. Further, as disclosed in Japanese Patent Application Laid-Open No. 11-283705, there is also a method in which a power blocking means such as a fuse is inserted in the plug of the product to prevent damage to the product.

【0003】

[Problems to be Solved by the Invention]

However, the technologies in each of the above publications are only available in the event of an abnormal situation such as electric leakage or disconnection, and other products use part of the configuration and are difficult to use. If an excessive voltage is applied, the fuse will break and cannot be used unless it is replaced. In general, factories often mix and produce models with different rated voltages on the same line, and a self-propelled trolley system that follows the products flowing on the line is adopted. FIG. 15 is a conceptual diagram in which a voltage is supplied from a variable power supply to models having different rated voltages via a self-propelled trolley which is a conventional self-propelled power supply device. Since the variable power supply 1 supplies power to the self-propelled trolley 2 and the models with different rated voltages have different plug shapes, the attachment 3 for connecting the self-propelled power supply device and the product is used. An appropriate voltage is supplied to the product 4 through the attachment 3. However, in the factory, domestic products and overseas products are mixed and handled with a variable power supply, so if you accidentally apply a voltage that greatly exceeds the rated voltage, the product will be damaged. There is. Especially in mixed production, when domestic machines (100V), North American machines (115V) and European machines (220V) are produced on the line, the voltage of the variable power supply is set to a large voltage such as 220V for Europe by mistake of the operator. Then, the voltage was applied to domestic and North American aircraft, and an accident occurred in which the product could not withstand the overvoltage and was damaged. It is conceivable that the cause of this is that the operator visually checks the voltage of the variable power supply and the product that supplies the voltage, and manually changes the power supply of the variable power supply and plugs it in. Therefore, such mistakes often occur, damaging the product. In view of the drawbacks of the prior art, it is an object of the present invention to provide a power supply stopping device that stops the power supply when a voltage significantly exceeding the rated voltage is applied to prevent damage to the product. ..

【0004】

[Means for solving problems]

In order to solve such a problem, the invention according to claim 1 is a variable voltage detecting means for detecting a voltage from a variable power supply and a rated voltage detection for detecting a rated voltage of a product operating with the power of the variable power supply. A means, a state determining means for determining whether or not a voltage from the variable power source can be supplied to the product by a signal from the variable voltage detecting means and the rated voltage detecting means, and a state determining means from the state determining means. It is characterized in that it is provided with a power supply control means for supplying or stopping the voltage of the variable power supply to the product by the signal of. According to such an invention, the voltage of the variable power supply and the rated voltage of the product to which the power supply should be supplied are compared, and if the rated voltage and the voltage of the variable power supply are different, the power supply control means is used to supply the product. This is to prevent damage to the product by preventing an abnormal voltage from being applied. Therefore, even if a mistake in the voltage setting of the variable power supply or a product with a rated voltage different from the voltage of the variable power supply is mistakenly connected, the difference is automatically detected to protect the product, resulting in an improvement in product yield. , Labor saving can be achieved. Further, according to the invention of claim 2, the variable voltage detecting means for detecting the voltage from the variable power supply, the rated voltage detecting means for detecting the rated voltage of the product operating with the power of the variable power supply, and the variable voltage detecting means. A state determining means for determining whether or not the voltage from the variable power source can be supplied to the product by a signal from the rated voltage detecting means is provided, and the voltage of the variable power source is determined by a signal from the state determining means. The power supply control means for supplying or stopping the product is integrated with the variable power supply. According to the present invention, the variable voltage detecting means, the rated voltage detecting means, the state determining means, and the power supply controlling means are all built in the variable power supply, and the variable power supply includes the rated voltage signal from the product and the rated voltage signal. It is connected only by the power supply line to the product, and from the product side, it is simply connected to the power supply, which simplifies the connection form. According to such an invention, when an electric circuit is to be realized as a means for preventing damage to a product, a power source for operating the circuit is required. To. When power is supplied from the outside, the circuit becomes large because a transformer or the like is incorporated. By incorporating an electric circuit in the variable power supply itself, a stable power supply can be secured and miniaturization can be achieved.

【0005】

Further, according to the invention of claim 3, it is possible to supply the voltage from the variable power supply to the product by the variable voltage detecting means for detecting the voltage from the variable power supply and the rated voltage from the product operating with the power of the variable power supply. A power supply control means for supplying or stopping the voltage of the variable power supply to the product by a signal from the state determination means is built in the power plug provided in the product. It is characterized by having done it. According to the present invention, since the variable voltage detecting means, the state determining means, and the power supply controlling means are built in the power plug of the product, the plug itself can determine the power supply voltage to the product. Then, the rated voltage detecting means can be omitted. Therefore, according to the present invention, no matter what variable power source is used to apply a voltage to the product, the product will not be damaged, and the product can be prevented from being damaged without selecting a variable power source. Further, according to the invention of claim 4, it is possible to supply the voltage from the variable power supply to the product by the variable voltage detecting means for detecting the voltage from the variable power supply and the rated voltage from the product operating with the power of the variable power supply. It is characterized in that the product is provided with a state determining means for determining whether or not to perform, and a power supply controlling means for supplying or stopping the voltage of the variable power supply to the product by a signal from the state determining means. .. According to the present invention, since the variable voltage detecting means, the state determining means, and the power supply controlling means are built in the product, the product itself has a function of determining the power supply voltage and shutting off the abnormal voltage. Therefore, even if the product is connected to a power supply having the wrong voltage, the product will not be damaged. According to such an invention, since the appearance does not change by being incorporated in the product, it can be attached without interfering with work such as production. In addition, damage to the product can be prevented without selecting a variable power supply. Further, according to the invention of claim 5, the variable voltage detecting means for detecting the voltage from the variable power supply, the rated voltage detecting means for detecting the rated voltage of the product operating with the power of the variable power supply, and the variable voltage detecting means. Communication from the rated voltage detecting means The product is provided with a state determination means for determining whether or not the voltage from the variable power supply can be supplied to the product according to the number, and the voltage of the variable power supply is supplied or stopped to the product by a signal from the state determination means. It is characterized in that the power supply control means is built in an intermediary system connecting the variable power supply and the product. According to such an invention, when a product moves during production work such as line production, power is supplied to a place where power supply is mediated, such as an intermediary system connecting a variable power supply and the product (for example, a self-propelled power supply device that follows a line). By assembling a circuit that stops the supply, it can be mounted without disturbing the work. A circuit operating power supply is required, but since it can be supplied by incorporating it into an intermediary system, the circuit can be miniaturized.

【0006】

Further, according to the invention of claim 6, the rated voltage detecting means can also detect by the presence or absence of a switch provided in the power plug of the product. Furthermore, according to the invention of claim 7, it is also an effective means of the present invention to detect the shape of the power plug of the product by image recognition. According to such technical means, it is necessary to recognize the difference in the plug of the product in order to detect the rated voltage of the product. Instead of incorporating a rated voltage detection circuit in order to miniaturize the circuit, a simple switch can be attached to the plug of the product so that the circuit can recognize the ON / OFF state of the switch by an electric signal. Alternatively, by attaching a camera and recognizing the shape of the plug of the product by image processing, it is possible to detect the product in a non-contact manner, so that the rated voltage of the product can be recognized more safely. Further, according to the invention of claim 8, the state determining means can be configured to logically determine the signals from the variable voltage detecting means and the rated voltage detecting means. According to such technical means, after detecting the voltage of the variable power supply and the rated voltage of the product, it is necessary to judge whether the power can be supplied from these two pieces of information. In order to realize this, it is possible to implement a power supply stop device with a small number of elements by providing a circuit for performing logical operations in the circuit. Further, according to the invention of claim 9, the power supply control means can be configured to connect or disconnect the variable power supply to the product by a result signal from the state determination means. According to such technical means, since the target is the voltage of the variable power supply and the rated voltage of the product, it is effective to detect the state and determine the supply by using an electric circuit. Therefore, a circuit that controls the supply or stop of power based on the judgment result is required. By receiving a signal from the power supply stop state determination circuit and controlling the power supply from the variable power supply to the product with a relay, it can be realized reliably and at low cost.

【0007】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail using the embodiments shown in the drawings. However, unless otherwise specified, the components, types, combinations, shapes, relative arrangements, etc. described in this embodiment are merely explanatory examples, not the purpose of limiting the scope of the present invention to that alone. .. FIG. 1 is a flowchart showing an operation concept of the power supply stop device of the present embodiment. First, the rated voltage is detected from the product using the rated voltage detection circuit (SP1). At the same time, the current voltage of the variable power supply is detected using a voltage detection circuit of the variable power supply, which is a known comparator (SP2). After detecting both pieces of information, the state judgment circuit determines whether the current voltage of the variable power supply greatly exceeds the rated voltage of the product (SP3). If it seems to be exceeded, the power supply is stopped by the power supply control circuit (SP5). If there is no problem, power is supplied as it is (SP4). FIG. 2 is a block diagram of the power supply stop device of the first embodiment. The power supply stop device 20 mainly adds the variable power supply voltage detection circuit 10 that detects the voltage of the variable power supply 1, the rated voltage detection circuit 12 that detects the rated voltage of the product 4, and the voltage of the variable power supply 1 to the product 4. It is composed of a state determination circuit 11 for determining whether or not to proceed, and a power supply control circuit 13 for stopping the power supply from the variable power supply 1 to the product 4 when it is determined that a voltage should not be applied. The solid line shows the flow of power, and the broken line shows the flow of signals used to determine whether to apply voltage to the product. Based on the signal from the variable power supply 1, the voltage of the variable power supply 1 is detected by using the voltage detection circuit 10 of the known variable power supply. Further, the rated voltage of the product 4 is determined by using the information that the shape of the plug is different for each rated voltage and detecting the rated voltage of the product 4 by using the rated voltage detection circuit 12 of the product 4. Based on the detected variable power supply information and product information, the state determination circuit 11 is used to determine whether the voltage of the variable power supply 1 should be applied to the product 4. Finally, when the state judgment circuit 11 determines that the voltage of the variable power supply 1 significantly exceeds the rated voltage of the product 4 and the voltage should not be applied based on the result of the state judgment circuit 11.

【0008】

FIG. 3 is a block diagram of the power supply stop device of the second embodiment. Since the same reference numbers are assigned to the parts equivalent to the parts of the embodiment shown in FIG. 2 in FIG. 3, duplicate description will be omitted. The same shall apply hereinafter. The difference from the first embodiment of FIG. 2 is that the power supply stop device is mounted inside the variable power supply device 21. The solid line shows the flow of power, and the broken line shows the flow of signals used to determine whether to apply voltage to the product. By incorporating it into the variable power supply device 21, the power input line from the variable power supply becomes unnecessary, and the current voltage judgment of the variable power supply device 21 is attached to itself, which facilitates the voltage judgment of the variable power supply. Further, a power supply for operating the circuit for stopping the power supply is required, but the circuit can be miniaturized because the power supply can be supplied from the variable power supply itself. FIG. 4 is a block diagram of the power supply stop device of the third embodiment. The difference from the first embodiment of FIG. 2 is that the power supply stop device is mounted inside the plug 22 of the product, and the rated voltage detection circuit 12 is omitted. The solid line shows the flow of power, and the broken line shows the flow of signals used to determine whether to apply voltage to the product. By doing so, it is not necessary to change the variable power supply at the line production site in the factory, and the labor at the time of introducing the line can be reduced. Further, since the rated voltage of the product is fixed by attaching it to the plug of the product, the rated voltage detection circuit can be omitted. Moreover, no matter what kind of variable power supply is changed, the power supply can be stopped by the plug, so that the product can be reliably prevented from being damaged. FIG. 5 is a block diagram of the power supply stop device of the fourth embodiment. The difference from the first embodiment of FIG. 2 is that the power supply stop device is mounted inside the product device 23. The solid line shows the flow of power, and the broken line shows the flow of signals used to determine whether to apply voltage to the product. In factories, especially in line production, there is no need to change the variable power supply, and there is less effort when introducing the line. Since the rated voltage of the product is fixed by attaching it to the product, the rated voltage detection circuit can be omitted. .. Moreover, no matter what kind of variable power supply is changed, the power supply can be stopped, so that the product can be prevented from being damaged. In addition, the power supply stop device can be mounted without changing the shape of the plug of the product.

【0009】

FIG. 6 is a block diagram of the power supply stop device of the fifth embodiment. The difference from the first embodiment of FIG. 2 is that the power supply stop device is mounted inside the intermediary system 24 that connects the variable power supply and the product. The solid line shows the flow of power, and the broken line shows the flow of signals used to determine whether to apply voltage to the product. In factories, especially in line production, products move on the line, so a power intermediary system that follows them is required. When mounted on this power intermediary system, the operating power of the power supply stop device can be supplied from the variable power supply 1, and the constituent circuit can be miniaturized. Moreover, since it is built in the intermediary system 24 that connects the variable power supply 1 and the product 4, it does not interfere with the line production workers. FIG. 7 is an external view of a plug equipped with a switch for detecting the rated voltage. As shown in the figure, as one means of determining the rated voltage of a product, when there are few targets, attach a switch to the plug of a specific product, do not attach it to the plug of a product with a different rated voltage, and distinguish by the presence or absence of a switch. There is a way. The figure shows an example of mounting on a plug with a low rated voltage of the product. When this method is used, as shown in Fig. 8, the rated voltage detection circuit of the product can be detected with a single switch, which reduces the number of components of the rated voltage detection circuit of the product and enables miniaturization. .. FIG. 9 is a conceptual diagram for image recognition of differences in product plugs depending on the camera. The figure shows an example in which the camera 30 is mounted on the self-propelled trolley 2. As shown in the figure, the shape of the plug differs for each product with a different rated voltage, so identification is possible based on features such as color and shape. As shown in the figure, the camera 30 is installed directly above the plug to take a picture of the plug 3 of the product 4, and the rated voltage of the product can be detected even without contact by image processing. In addition, even if the shape or color of the plug changes, it can be easily handled by simply digitizing and inputting the features into an image processing device (not shown). The self-propelled trolley 2 in the figure is a known power supply device, which is a system that mediates between a variable power supply that moves following a product flowing on a line and supplies electric power to the product.

【0010】

FIG. 10 is a diagram showing an input / output relationship of a logic circuit as a state determination circuit of the present embodiment. As a means for determining whether the power of the variable power supply can be applied to the product, it is most common to determine the state using a logic circuit. When the target product is domestic (100V), North America (115V), Europe (220V), the voltage of the variable power supply is H (5V) when set to 220V, and L (0V) when set to 100 or 115V. The signal is converted and used as an input to the logic circuit 31. The rated voltage of the product is H for European machines without a switch, and L for domestic and North American machines with a switch, as shown in Fig. 7. When a NAND circuit is used for the logic circuit 31 shown in FIG. 10, it is a circuit that outputs L only when the input is HH. The figure shows the input / output relationship of the logic circuit 31 when it is determined that power should not be supplied. With inputs other than this case, there is no problem with product damage, so H is output to supply power. When the voltage of the variable power supply is 220V, the signal from the variable power supply becomes H, and when the rated voltage is 100 or 115V, the signal from the product becomes H, and the input to the logic circuit 31 becomes HH and outputs L. .. When this logic circuit 31 outputs L, it is determined that the power of the variable power supply should not be applied to the product, and the power supply is stopped. In this case, the NAND circuit is used for the logic circuit 31, but other logic circuits may be used. FIG. 11 is an example of a power supply control circuit. When the state determination circuit 11 determines that power should not be supplied, as a means of stopping the power supply, is the voltage of the variable power supply 1 supplied to the product 4 by opening and closing the contact using a relay as shown in the figure? There is a way to control whether or not. The power supply control circuit 13 is a method of controlling the power supply by turning on / off the contact 13b of the relay element 13a in response to the power supply stop signal from the state determination circuit 11. If the state determination circuit 11 determines that the voltage of the variable power supply 1 significantly exceeds the rated voltage of the product 4, and transmits the command to a power supply stop device (not shown), a part of the power supply control circuit 13 A certain relay element 13a is turned off, and the contact 13b is opened so that the power of the variable power supply 1 is not applied to the product 4. Conversely, if the state determination circuit 11 determines that the voltage of the variable power supply 1 does not significantly exceed the rated voltage of the product 4, the product 4 will not be damaged even if power is supplied, so the relay element 13a is turned ON. The contact 13b is closed and power is supplied.

【0011】

[Example] FIG. 12 is a diagram showing an input / output relationship of a power supply stop circuit. First, regarding the detection of the voltage of the variable power supply, since there is a voltage detection circuit 10 that detects the voltage of the variable power supply in the self-propelled trolley, that information is used. The output of the voltage detection circuit 10 becomes H when the voltage of the variable power supply is high (220V) and L when the voltage of the variable power supply is low (100V). In addition, the plug of the product is different for each model with a different rated voltage. And there is an attachment to connect the self-propelled trolley and the plug of the product, and there is an attachment for each different model. FIG. 13 is a diagram showing the correspondence between the attachment and the product plug. In this example, the attachment switch is attached to the plug of the product with a low rated voltage. The switch turns on when the attachment is connected to the trolley. Attachments compatible with plugs of products with a high rated voltage do not have a switch to distinguish them, and the switch is always off. In the power supply control circuit, information on the rated voltage of the product is obtained from the ON / OFF state of the switch of the attachment, which is the rated voltage detection circuit of this product. The power supply control circuit controls whether to supply power to the product from these two pieces of information. The output of the power supply control circuit sends a power supply stop signal when the switch of the attachment is ON and the voltage of the variable power supply is judged to be high. On the contrary, in other states, a power supply signal is sent to the product.

【0012】

FIG. 14 is a circuit diagram of the power supply stop circuit of the present invention. Circuit operation power supply (not shown) is supplied from the power supply in the self-propelled trolley. This is the power required to operate the power supply control circuit 13. The operating power supply of each logic circuit is supplied by dropping the voltage to 5V using a 3-terminal regulator 40 based on the circuit operating power supply. This is because the H level of the logic circuit used this time is 5V. The input to the state determination circuit 11 consisting of the AND circuit 41 and the NOT circuit IV2 is the signal from the voltage detection circuit of the self-propelled trolley that indicates the voltage of the variable power supply 1 and the product currently connected from the attachment switch SW1. It is a signal indicating the rated voltage. Then, the ON / OFF of the relay element RL of the power supply control circuit 13 is controlled by the output signal. When it is ON, the contact 42 closes and supplies power to the product 4, and when it is OFF, the contact 42 opens and stops the power supply. At the first stage, the relay element RL is not conducting and power is not supplied to the product. When the output from the self-propelled trolley is H, a voltage of 5V or more is applied, so it is only adjusted by resistors R1 and R3. L is entered. When the attachment switch SW1 is ON, it is grounded to GND and L is input to the NOT circuit IV1. Therefore, H is input to the AND circuit 41. When the attachment switch SW1 is OFF, 5V from the 3-terminal regulator 40 is applied via the resistor R1, so H is input. Therefore, L is input to the AND circuit 41. When the output of the AND circuit 41 is H, the output of the NOT circuit IV2 is L. Therefore, since no current flows through the transistor Tr1, the relay element RL is turned off. When the output of the AND circuit 41 is L, the output of the NOT circuit IV2 becomes H. Therefore, since the current flows through the transistor Tr1, the relay element RL is turned on. From the above, in this circuit, when the voltage detection result is H and the attachment switch is ON, the relay element RL is turned OFF to supply power to the product. Stop. In other combinations, the relay element RL is turned on to supply power to the product. This circuit makes it possible to prevent damage to the product caused by overcurrent when the voltage of the variable power supply is connected in a state where the voltage of the variable power supply greatly exceeds the rated voltage of the product.

【0013】

[Effect of the invention]

According to the invention described in claim 1 as described above, even if a voltage significantly exceeding the rated voltage is applied to the product due to a human error of the operator, the power supply to the product can be stopped. it can. As a result, if the power is not turned on, the operator notices an abnormality and returns to a normal state to prevent the product from being damaged. According to the invention of claim 2, the current voltage determination of the variable power supply is facilitated because it is implemented in itself. Since the variable power supply itself can supply electric power for operating the circuit that stops the electric power supply, the circuit can be miniaturized. According to the invention described in claim 3, the labor required for introducing the line is small, and the power supply stop device can be easily mounted, which leads to an improvement in productivity. No matter what the variable power supply is changed, the power supply can be stopped by the plug, so the product can be prevented from being damaged. Further, since it is mounted on the plug of the product, the information on the rated voltage of the product can be given to the device from the beginning, and the rated voltage detection circuit of the product becomes unnecessary. According to the invention described in claim 4, the burden on the operator is reduced without changing the shape of the plug, and the product itself can stop the power supply regardless of the variable power supply. Can be prevented from being damaged. Further, since it is mounted on the product itself, information on the rated voltage of the product can be given to the device from the beginning, and the rated voltage detection circuit of the product becomes unnecessary.

【0014】

According to the invention of claim 5, since the voltage detection circuit of the variable power supply is provided in the self-propelled trolley, the voltage detection of the variable power supply becomes easy. Further, since the operating power supply for the circuit can be supplied from the self-propelled trolley itself, the circuit can be miniaturized. Furthermore, since the shape of the plug is not changed, it does not interfere with the work. According to the invention described in claim 6, the rated voltage of the product can be easily found by simply attaching a simple switch to the plug of the product, and the circuit can be miniaturized. According to the invention described in claim 7, the rated voltage of the product can be accurately detected by attaching a camera to the plug or the self-propelled trolley and recognizing the shape of the plug by simple image processing. Also, when attached to the self-propelled trolley side, the rated voltage of the product can be known even if the plug is not in contact, which is safer. According to the invention described in claim 8, the relay element can be switched ON / OFF by a simple logical operation based on the state of the variable power supply and the state of the rated voltage of the product. The number can be reduced and the size can be reduced. According to the invention described in claim 9, the state of the variable power supply and the state of the rated voltage of the product can be determined by an electric signal, and the device itself becomes only an electric circuit board, which is practical. Further, if the state of the variable power supply is improved by using an electronic circuit such as a relay element, the power supply can be automatically restarted without damaging the product.

[Simple explanation of drawings]

[Figure 1]

It is a flowchart which shows the operation concept of the power supply stop device of this embodiment.

[Figure 2]

It is a block diagram of the power supply stop device of 1st Embodiment.

[Fig. 3]

It is a block diagram of the power supply stop device of the 2nd Embodiment.

[Fig. 4]

It is a block diagram of the power supply stop device of 3rd Embodiment.

[Fig. 5]

It is a block diagram of the power supply stop device of 4th Embodiment.

[Fig. 6]

It is a block diagram of the power supply stop device of 5th Embodiment.

[Fig. 7]

It is the outline drawing of the plug which attached the switch for the rated voltage detection.

[Fig. 8]

It is a figure which shows the example which used the switch in the rated voltage detection circuit of a product.

[Fig. 9]

It is a conceptual diagram which image recognizes the difference of a product plug by a camera.

[Fig. 10]

It is a figure which shows the input / output relation of the logic circuit as the state determination circuit of this embodiment.

[Fig. 11]

It is a figure which shows an example of the power supply control circuit.

[Fig. 12]

It is a figure which shows the relation of input / output of a power supply stop circuit.

[Fig. 13]

It is a figure which shows the correspondence between the attachment and the product plug.

[Fig. 14]

It is a circuit diagram of a power supply stop circuit.

[Fig. 15]

It is a conceptual diagram which supplies a voltage from a variable power source to the models having different rated voltages through a self-propelled trolley which is a conventional self-propelled power supply device.

[Explanation of symbols]

1 Variable power supply 4 products 10 Variable power supply voltage detection circuit 11 State judgment circuit 12 Product rated voltage detection circuit 13 Power supply control circuit 20 Power supply stop device