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Leakage circuit breaker

A leakage circuit breaker and circuit technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as power circuit failures of leakage circuit breakers, and achieve the effect of preventing failures

Active Publication Date: 2016-10-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if Figure 7 As shown, if a load circuit is connected to an earth leakage circuit breaker, it may be accidentally damaged by the devices connected to the earth (such as surge absorbing capacitors, noise filters, etc.) Ground continuously applies overvoltage between phases, as a result, the power supply circuit of the leakage circuit breaker fails

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] figure 1 It is a circuit diagram showing the structure of an earth leakage circuit breaker using a power supply circuit according to Embodiment 1 of the present invention, figure 2 yes means figure 1 A circuit diagram showing an example of the details of the integrating circuit.

[0024] exist figure 1 Among them, the leakage circuit breaker 100 has: a switch contact 2, which makes the AC circuit 1 on and off; a leakage detection circuit 6, which is connected to the zero-phase-sequence converter 3 inserted in the AC circuit 1, that is, the leakage current detector, And based on the detection signal of the zero-phase-sequence converter 3, the leakage is detected; the tripping device 4 has a tripping coil 4a and a tripping mechanism 4b, wherein the tripping coil 4a is based on the output signal of the leakage detection circuit 6, via a switch (switching) unit 8 to generate electromotive force, the tripping mechanism 4b separates and drives the switch contact 2 when...

Embodiment approach 2

[0058] image 3 It is a circuit diagram showing the structure of an earth leakage circuit breaker using a power supply circuit according to Embodiment 2 of the present invention, Figure 4 yes means image 3 A block diagram showing an example of the details of the leakage detection circuit.

[0059] The leakage circuit breaker 101 of this embodiment is provided with the leakage test circuit 10 including the overvoltage detection circuit instead of the overvoltage detection circuit 9 of the first embodiment, and achieves various effects similar to those of the first embodiment described above.

[0060] exist image 3 Among them, the leakage test circuit 10 of the leakage circuit breaker 101 is composed of the following components: the 4th Zener diode 9a, the cathode of which is connected to the cathode of the 3rd Zener diode 56; the test switch 10a, one end of which is connected to the first constant voltage circuit 7 The output connection of the other end is connected with th...

Embodiment approach 3

[0083] Figure 5 It is a circuit diagram showing the structure of the earth leakage circuit breaker for DC using the power supply circuit of Embodiment 3 of this invention.

[0084] exist Figure 5 In the earth leakage circuit breaker 102 of this embodiment, the overvoltage detection circuit 9 of Embodiment 1 is applied to the earth leakage circuit breaker for DC. In the first embodiment, the zero-phase-sequence converter is used as the leakage current detector, but the fluxgate sensor 31 capable of detecting a direct current leakage current is used as the leakage current detector, and various functions similar to those in the above-mentioned first embodiment are realized. Effect.

[0085] Such as Figure 5 As shown, the fluxgate sensor 31 has: an annular iron core 31a, into which the DC circuit 11 is inserted; a coil 31b, which is wound on the iron core 31a; 31a applies a voltage so as to saturate the magnetic flux density of the coil 31b while reversing the direction; an...

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Abstract

The purpose of the present invention is to provide a leakage circuit breaker, which can prevent a built-in power circuit from breakdown by cutting off the leakage circuit breaker even in a condition such as a voltage withstand testing in which overvoltage is applied on an AC circuit continuously. The leakage circuit breaker of the present invention comprises: a rectification circuit for converting an AC voltage supplied from a AC circuit (1) to a DC voltage; a second constant voltage circuit (53) of stepping down the voltage output from the rectification circuit; a second zener diode (54) for detecting overvoltage from the output voltage of the rectification circuit; a second resistor (55) for stepping up the output voltage of the second constant voltage circuit (53) while the overvoltage is detected by the second zener diode (54); a third zener diode (56) for absorbing surge current while the output voltage of the second constant voltage circuit (53) reaches to a first predetermined value; and a overvoltage detection circuit (9) for detecting whether the output voltage of the second constant voltage circuit (23) reaches to the predetermined value so as to activate a tripping device.

Description

technical field [0001] The present invention relates to an earth leakage circuit breaker which disconnects a circuit when the leakage current of the circuit becomes greater than or equal to a predetermined value, and in particular relates to an operating power supply of the earth leakage circuit breaker. Background technique [0002] The power supply circuit built into this leakage circuit breaker converts the AC voltage (for example, AC100V) supplied from the AC circuit into a DC voltage by a rectification circuit, and then converts the rectified DC voltage to a lower voltage by a step-down circuit. A DC voltage (for example, DC24V) is supplied as a drive power supply to the leakage detection circuit and the tripping device. [0003] In such a power supply circuit, when a surge voltage (surge voltage) is induced in the AC circuit due to lightning strike, arcing ground, etc., it is necessary to protect the leakage detection circuit and the tripping device from the surge volt...

Claims

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Application Information

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IPC IPC(8): H02H3/34
CPCH02H3/162
Inventor 金山健志佐藤和志长畑和宏
Owner MITSUBISHI ELECTRIC CORP
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