Under-voltage tripper circuit for miniature circuit breaker

Abstract

The invention relates to an under-voltage tripper circuit for a miniature circuit breaker. The under-voltage tripper circuit for the miniature circuit breaker comprises a power supply circuit, and is characterized by also comprising an under-voltage detection and control circuit and a tripping circuit, wherein the power supply circuit, the under-voltage detection and control circuit and the tripping circuit are connected in sequence. The under-voltage detection and control circuit consists of a voltage detector U1, a resistor R4, a resistor R5, a resistor R6 and a capacitor C2; the voltage detector U1 is connected with the resistor R5 in series after being connected with the resistor R4 in parallel; the resistor R6 and the resistor R5 are connected in series; the anode of the capacitor C2 is connected with one end of the resistor R6; the cathode of the capacitor C2 is connected with the negative electrode of silicon controlled D6 in the tripping circuit; the other end of the resistor R6 is connected with a control electrode of the silicon controlled D6 in the tripping circuit. The under-voltage tripper circuit for the miniature circuit breaker provided by the invention has the advantages that the working temperature rise of a tripper is reduced, the fluctuation range of an under-voltage protection threshold value is small, the power consumption is low, the operating characteristic is stable, the circuit design is simple, the EMC (electromagnetic compatibility) resistance is strong, and the reliability is high, and more meets the actual demand of the under-voltage tripper for the miniature circuit breaker.

Description

technical field [0001] The invention relates to the field of release circuits, more specifically, to an undervoltage release circuit for a small circuit breaker. Background technique [0002] With the rapid development of my country's industrial and civil buildings, as well as higher and higher requirements for power supply and distribution safety, when the power supply system has voltage abnormalities, such as undervoltage or overvoltage faults, it will cause loss of function of electrical equipment or appliances Or permanent damage, not only will cause economic losses, but also cause disasters and accidents. The existing circuit breaker undervoltage release circuit adopts the following scheme: the undervoltage release circuit is only responsible for the processing of voltage signals, and does not perform voltage undervoltage judgment, and the entire undervoltage judgment depends entirely on the coil suction and reaction force of the release The elasticity of the spring is ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a small circuit breaker in view of the defects of the prior art such as frequent false tripping, large fluctuation range of undervoltage protection threshold, high power consumption, unstable action characteristics, and complicated circuit design. The undervoltage release circuit of the device at least includes: a power supply circuit; an undervoltage detection and control circuit; a trip circuit; wherein, the power supply circuit, the undervoltage detection and control circuit, and the trip circuit are connected in sequence

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