JPS6231322A - Power source breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement in a power cutoff device for a power supply device used to convert alternating current to direct current and supply power to various electrical and electronic devices. .

[Technical background of the invention]

A conventional device of this kind is shown in FIG. 1 indicates a circuit breaker, and this circuit breaker has an input terminal 1.
Power is supplied via an input terminal 21 from an AC power supply (not shown) connected to 0.11.

Constant voltage circuits 2 and 3 are connected to output terminals n and 23 of the circuit breaker 1 in parallel. Constant voltage circuit 2,
3, output terminal 12.13 and output terminal 14.1, respectively.
Power is supplied to an electronic/electrical device (not shown) via 5. Over/under voltage detection circuits 5 and 6 are connected between the output lines of the constant voltage circuits 2 and 3, and overcurrent detection circuits 7 and 8 are connected to one output line of each of the constant voltage circuits 2 and 3. It is connected.

Reference numeral 4 indicates a control section, and this control section 4 controls the breaking operation of the circuit breaker I. Further, the control unit 4 is operable by being supplied with power from the constant voltage circuit 3, and is configured to operate within the circuit breaker 1 based on the outputs of the over/under voltage detection circuits 5, 6 and the overcurrent detection circuits 7, 8. Voltage trip coil #
A signal is given to L3 via the input terminal u, 25. In addition, in the circuit seeker 1, overcurrent 4 removal coil Ll,
L2 is provided, and even when an overcurrent flows through these coils Ll and L2, the circuit breaker 1 is activated and cuts off the AC path.

[Problems with background technology]

However, according to such a conventional power cutoff device, when a short circuit occurs between the output terminals 14 and 15, power is no longer supplied to the control unit 4, and the circuit breaker 1 is activated to cut off the supply of AC power. This resulted in major damage to electronic and electrical equipment, constant voltage circuits 2 and 3, etc.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned drawbacks of the power cutoff device, and its purpose is to reliably switch off the AC path when the power supplied to the control unit that controls the circuit breaker becomes abnormal. It is an object of the present invention to provide a power cutoff device that can cut off power.

[Summary of the invention]

Therefore, in the present invention, when there is an abnormality in the power supply to the control unit that controls the breaking operation of the circuit breaker installed in the path through which AC reaches the power supply unit, the auxiliary power supply unit supplies the power required by the control unit. The above object has been achieved by configuring the power cutoff device to supply .

[Embodiments of the invention]

FIG. 1 is a block diagram of one embodiment of the present invention.

In this figure, the same components as in FIG. 2 are given the same reference numerals and their explanations are omitted. 50 is connected. This auxiliary power supply section 50 consists of a diode D1 and a capacitor C1. Diode D1 is provided to prevent current from flowing in the direction of arrow X.

Further, the capacitor CI accumulates the electric charges given from the constant voltage circuit 3, and when an abnormality occurs in the electric power given from the constant voltage circuit 3 to the control section 4, the capacitor CI supplies the electric power from the accumulated charges to the control section 4.

In such a power cutoff device, by turning on the handle lever (not shown) of the circuit breaker 1, AC power is transmitted from the input terminal 10.11 to the constant voltage circuit 2.3 through the circuit breaker 1. The outputs of the constant voltage circuits 2 and 3 are provided to the electric/electronic device via output terminals 12.13 and 14.15, respectively.

The control unit 4 receives power from the constant voltage circuit 3 via the diode D1 in the auxiliary power supply unit 50, and is in an operable state. At this time, when an abnormality occurs in the constant voltage circuit 2m and a signal is output from the over/under voltage detection circuit 5 or the overcurrent detection circuit 7, the control section 4 applies a voltage to the coil L3 based on this. This causes the circuit breaker l to cut off the alternating current power. On the other hand, when an abnormality occurs in the constant voltage circuit 3 and its output suddenly drops, or when a short circuit occurs between the output terminals 14 and 15, power is supplied to the control unit 4 by the capacitor C1. become. As a result, a voltage can be applied to the 1-voltage σ■ removal coil L3 without being affected by the output of the constant voltage circuit 3, and the circuit breaker 1 can cut off alternating current power. child .

When , the capacitor C1 increases due to the action of diode D1.
This prevents more current from flowing to the constant voltage circuit 3 side.
Power can be appropriately supplied to the control unit 4.

In the embodiment, the capacitor C1 and the diode D1 are used, but in addition to the capacitor C1, a power storage means such as a storage battery can be used. Preventive measures can be used. In addition, even if there is only one constant voltage circuit,
There may be three or more circuits. Further, the voltage applied to the auxiliary power supply unit 50 may be a rectified voltage before being stabilized by the constant voltage circuit.

〔Effect of the invention〕

As explained above, according to the present invention, appropriate power is always supplied to the control unit, so even if the power supply to the control unit becomes abnormal, AC power can be reliably cut off, and each circuit damage can be minimized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional power cutoff device.

Claims (2)

[Claims] (1) A circuit breaker that cuts off an AC path to a power supply unit that exchanges AC into DC; a control unit that is driven by DC supplied from the power supply to control the breaking operation of the circuit breaker; A power cutoff device comprising: an auxiliary power supply section that supplies power to the control section when an abnormality occurs in the supplied DC power. (2) The auxiliary power supply section consists of a storage means for storing electric power supplied from the power supply section, and a backflow prevention means connected to prevent the current from the storage means from flowing back to the power supply section. A power cutoff device according to claim (1).