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Abnormal current detecting circuit for circuit breaker

A technology for abnormal current and circuit detection, applied in circuit breaker testing, measuring current/voltage, circuit devices, etc., to solve problems such as changes in integrated circuits, failure to provide reliable detection of abnormal current, and failure to ensure reliable operation of circuit breakers

Active Publication Date: 2010-12-22
LSIS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This detection delay in circuit breakers that require fast tripping presents a problem that will cause damage to the load equipment and the circuit
[0006] Furthermore, in the abnormal current detection circuit for a circuit breaker according to the prior art, when its detection circuit is configured with typical electronic equipment, the characteristics of the equipment vary with temperature and production process speed variations ) (i.e., low-speed products, standard-speed products, and high-speed products), or the characteristics of the integrated circuit may change in configuring the integrated circuit, thereby causing failure to provide reliable detection of abnormal current, and failure to ensure reliable operation of the circuit breaker question

Method used

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  • Abnormal current detecting circuit for circuit breaker
  • Abnormal current detecting circuit for circuit breaker
  • Abnormal current detecting circuit for circuit breaker

Examples

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Embodiment Construction

[0025] Objects of the present invention, configurations and operations for accomplishing the above objects will be clearly understood through the following description of preferred embodiments of the present invention with reference to the accompanying drawings.

[0026] First, combine figure 1 An overall circuit diagram showing an abnormal current detection circuit for a circuit breaker according to the present invention and a power circuit mounted with a circuit breaker including the abnormal current detection circuit is described.

[0027] The entire power circuit installed with a circuit breaker can be configured to include an alternating current (AC) current source 100, a zero-phase converter (hereinafter abbreviated as ZCT) 102, a filter circuit 103, a resistor 101 for voltage formation, a direct current (DC) Convert the power supply circuit section 104, the abnormal current detection circuit 200, the solid-state switch (so-called semiconductor switch) SCR, the trip coil...

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Abstract

Disclosed herein is an abnormal current detection circuit for circuit breaker, comprising a full-wave amplifier, a positive wave-period comparator for comparing a positive wave-period amplification voltage signal with a positive wave-period reference voltage signal to output a pulse signal, a negative wave-period comparator for comparing a negative wave-period amplification voltage signal with a negative wave-period reference voltage signal to output a pulse signal, a combining circuit for combining pulse signals outputted from the positive wave-period comparator and the negative wave-period comparator to output a full-wave combining signal, a reference voltage generator for generating a reference voltage signal, and a comparative driving circuit section for comparing the combining signal with the reference voltage signal to output a signal for controlling a circuit breaker to be driven to a circuit breaking position when the combining signal is greater or equal to the reference voltage signal.

Description

technical field [0001] The present invention relates to a circuit breaker, and more particularly, to an abnormal current detection circuit for the circuit breaker configured to electrically detect abnormal current in the circuit, thereby allowing the circuit breaker to cut off the circuit when the abnormal current flows in the circuit. Background technique [0002] A circuit breaker is a power device used to detect abnormal current to automatically disconnect the circuit, thereby protecting life, electric load equipment and circuits from power and load when abnormal currents such as overcurrent, short circuit current or others occur in the circuit. damage by fault currents in the supply circuit between them. Among such circuit breakers, the earth leakage circuit breaker is a circuit breaker having a function of breaking a circuit when leakage current, overcurrent and short circuit current are detected, thereby protecting life, load equipment and circuits from fault current. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08G01R19/165
CPCH02H3/33H02H1/0092G01R19/00G01R31/327
Inventor 宣钟局
Owner LSIS CO LTD
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