JP2519799B2 - Power supply - Google Patents

Description

The present invention relates to a power supply device that handles a high-voltage power supply, and for the purpose of ensuring the safety of the device when operating the device, by supplying and non-supplying a drive input signal, respectively. A control circuit that controls the supply and non-supply of input power to the power supply line and the opening and closing of the door of the device is monitored. If it is closed, the above-mentioned drive input signal is supplied to the control circuit, while if it is open, the drive input to the control circuit A door monitoring circuit that performs a door monitoring operation that does not supply a signal, a self-holding start circuit that turns on when self-holding is required, and a self-holding state by turning on the self-holding start circuit even when the door opening of the door monitoring circuit is detected. And
Supplying a drive input signal to the control circuit despite the door opening,
When the door is closed, the drive input signal is continuously supplied even when the door is detected after the self-holding start circuit is turned on. The holding state is released, and a self-holding circuit for validating the door monitoring operation of the door monitoring circuit is provided.

[Industrial applications]

 The present invention relates to a power supply device that handles a high voltage power supply.

For example, when testing an infrared device or the like, a power supply device that handles a high voltage power supply is used as the test device. When the input power source has a high voltage, it is dangerous to touch the inside of the device during operation and safety is required. For this reason, when a person who does not know that a high voltage is applied inside the device opens the door of the device panel, power is not supplied when the door is open (state 1), and in the case of a test, etc. It is necessary to return to the above state 1 when power is supplied and the test or the like is completed even when the is opened.

[Conventional technology]

FIG. 3 shows a schematic configuration diagram of a conventional example. In the figure, when power is supplied to the inside of the power supply device (test device) 1, the switch 2 is turned on after confirming the safety by visual inspection or the like, and the control circuit driving input signal is supplied via the switch 2 to the control circuit 3 To supply the high voltage input power to the internal power supply line by the operation of the control circuit 3.

[Problems to be Solved by the Invention]

In the above conventional device, the door of the device panel and the switch 2 have no relation to each other. Therefore, even if the door is open, if the switch 2 is on, a high voltage is applied to the inside as it is. For this reason, if a person who does not know that a high voltage is applied to the inside touches the inside from an open door, there is a problem that it is extremely dangerous.

An object of the present invention is to provide a power supply device capable of ensuring the safety when operating the device.

[Means for solving the problem]

FIG. 1 shows the principle of the present invention. In the figure, reference numeral 20 denotes a control circuit, which controls supply / non-supply of input power to the power supply lines by supplying / non-supplying a driving input signal. Reference numeral 21 denotes a door monitoring circuit, which monitors the opening and closing of the door of the device, and supplies a driving input signal to the control circuit 20 when closed, and does not supply a driving input signal to the control circuit 20 when opened and performs a door monitoring operation. . 22 is a self-holding start-up circuit, which turns on when self-holding is required. 23 is a self-holding circuit, which is brought into a self-holding state by turning on the self-holding starting circuit 22 even when the door open circuit 21 detects that the door is open, and supplies a drive input signal to the control circuit 20 in spite of the door open. When the door is closed, the self-holding starter circuit is turned on, and then the drive input signal is continuously supplied even when the door is opened, and the door monitoring circuit 21
When the door is closed, the self-holding state is released regardless of the state of the self-holding starting circuit 22, and the door monitoring circuit 21
The above-mentioned door monitoring operation is validated.

[Action]

Normally, when the door is closed, the input power is supplied to the power supply line by the control circuit 20, and when the door is open, the input power is not supplied to the power supply line by the control circuit 20 receiving the door open signal from the monitoring circuit 21. This eliminates the risk of electric shock even if a person who does not know that a high voltage is applied inside opens the door. On the other hand, when performing a test with the door open, if the door is opened with the self-holding start circuit 22 turned on, or if the self-holding start circuit 22 is turned on after the door is opened, the self-holding state is set. The control circuit 20 is put into the operating state through the self-holding circuit 23, and the input power is supplied to the power supply line with the door open. When the test is completed and the door is closed, the self-holding state of the self-holding circuit 23 is released and the initial state is restored again. If the door is opened again, the operation in which the input power is not supplied to the power supply line is performed.

As described above, the power supply is cut off when the door is normally opened, and the power can be supplied with the door opened during a test or the like, and the initial state can be restored again when this is completed.

〔Example〕

FIG. 2 shows a block diagram of an embodiment of the present invention. In the figure,
10 is a power supply device (testing device), which is a control circuit 11 for supplying high-voltage input power to the internal power supply line, a door monitoring circuit 12 for monitoring the door of the device panel, a self-holding circuit 13, a self-holding starter circuit 14, a device It is composed of a power switch 15.

When supplying power to the device, the door is closed and the device power switch 15 is turned on. By closing the door, the momentary switch 12a of the door monitoring circuit 12 is connected to the terminal a side, whereby the relay 11a of the control circuit 11 is activated and its contact switch 11b is connected to the terminal a side. As a result, the high voltage input power is supplied to the internal power supply line via the contact switch 11b. When the door is opened in this state, the switch 12a of the door monitoring circuit 12 is connected to the terminal b side, the relay 11a of the control circuit 11 is deactivated, and its contact 1
1b is connected to the terminal b and the power supply is cut off. Therefore, even if a person who does not know that a high voltage is applied to the inside opens the door and touches the inside, the high voltage supply is cut off by opening the door, so there is no risk of electric shock.

Next, when the door is opened and the test is performed with the high voltage applied to the internal power supply line, the self-holding start circuit
Open the door with the momentary switch 14a of 14 on, or after opening the door, self-holding start circuit
When the momentum switch 14a of 14 is turned on, the switch 12a of the door monitoring circuit 12 is connected to the terminal b as described above. By connecting the switch 12a to the terminal b and turning on the switch 14a, the self-holding circuit 13 is turned on. Relay 13a is activated,
The interlocking relay contact 13b, which was normally connected to terminal a,
13c is connected to the terminal b. As a result, a path is formed in which the control circuit driving input signal is supplied to the relay 11a of the control circuit 11 via the contact 13c of the self-holding circuit 13. That is, even if the door is opened and the switch 12a is connected to the terminal b, a high voltage is continuously applied to the power supply line by self-holding and the test can be performed. At this time, switch 14
Even when a is turned off, the switch 13b is connected to the terminal b, so that the relay 13a remains in the operating state.

When the test is completed and the door is closed, the switch 12a turns to the terminal a.
Connected to. As a result, the relay 13a is deactivated, its contacts 13b, 13c are respectively connected to the terminal a, the self-holding is released, and the device returns to the initial state. In order to cancel the self-holding, the reset input may be supplied to the switch 12a and forcibly connected to the terminal a. In this case, since the door is in the open state, the monitoring circuit 12 immediately switches the switch 12a to It is connected to the terminal b and the power supply is cut off. In this way, it is safe even if a person who does not know the high voltage approaches, and when the test is immediately restarted, the switch 14a may be turned on.

〔The invention's effect〕

As described above, according to the present invention, when the door is opened normally, the power supply is cut off. Therefore, a person who does not know that a high voltage is applied to the inside of the door does not have a fear of electric shock even when the door is opened. On the other hand, during the test, the power supply can be continued even if the door is opened during the test, so the test can be performed as it is.If the test is completed and the door is closed, the power will be supplied if the door is opened. You will be refused.

[Brief description of drawings]

 FIG. 1 is a principle diagram of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, and FIG. 3 is a schematic configuration diagram of a conventional example. In the figure, 10 is a power supply device (test device), 11 and 20 are relay control circuits, 11a and 13a are relays, 11b, 12a, 13b, 13c and 14c are switches, 12 and 21 are door monitoring circuits, and 13 and 23 Shows the self-holding circuit and 14,22 shows the self-holding start circuit.

Claims (1)

(57) [Claims] 1. A control circuit (20) for controlling the supply and non-supply of an input power to a power line by supplying and non-supplying a driving input signal, and a door opening / closing of a device is monitored, and if it is closed. A door monitoring circuit (21) for performing a door monitoring operation in which the drive input signal is supplied to the control circuit (20) while the drive input signal is not supplied to the control circuit (20) when the control circuit (20) is open; A self-holding starting circuit (22) that is turned on when holding is required, and even when the door opening of the door monitoring circuit (21) is detected, the self-holding starting circuit (22) is turned on to be in a self-holding state, The drive input signal is supplied to the control circuit (20) regardless of the door opening, and the drive input signal is detected even when the door is detected after the self-holding start circuit (22) is turned on when the door is closed. Continuously supply and close the door of the door monitoring circuit (21). A self-holding circuit (23) for canceling the self-holding state regardless of the state of the self-holding start-up circuit (22) by detection and validating the door monitoring operation of the door monitoring circuit (21); Characteristic power supply device.