Under voltage/subexcitation drop-away device circuit

Abstract

This invention relates to undertension / trip circuit composed of rectifying filter circuit, board voltage DC regulation, hysteresis comparison, pulse latching, pulse width modulation generation, trigger, sampling feed-back, MOSFET tube drive and program control timing circuits with the connection between circuits of the rectifying filter and broad voltage DC regulation and sampling feedback, the broad voltage DC regulation and hysteresis comparison, pulse latching, pulse modulation generation, trigger, MOSFET tube drive and program control timing, the hysteresis comparison and the pulse width modulation generation and trigger, the output of pulse width modulation generation, the sampling feedback light-coupled to trigger, program control timing and the pulse latching.

Description

technical field [0001] The invention relates to an undervoltage / shunt release circuit integrating an undervoltage release and a shunt release, and belongs to the technical field of low-voltage switch accessories. Background technique [0002] In the prior art, a comparator composed of two triodes detects the rectified voltage and controls the pulse generator to work. The pulse generator uses the voltage before and after the zero crossing of the power supply to compare with a certain voltage (threshold). The power tube is turned on before and after the zero crossing point (the voltage is less than the threshold value at this time), and it is turned off for the rest of the time. The delay is mainly realized by the charge and discharge of the capacitor, and the delay can be changed by adjusting the potentiometer. Its main defect is that the entire line is high-voltage. If there is a peak voltage, it is easy to damage components; the system has poor anti-interference ability a...

AI Technical Summary

Problems solved by technology

Its main defect is that the entire line is high-voltage. If there is a peak voltage, it is easy to damage components; the system has poor anti-interference ability and is prone to malfunction; the temperature rise of the electromagnetic system is high; The repair rate is high; the holding force is not enough when undervoltage; the delay error is large, and it is inconvenient to modify; different products cannot be used universally, and the inventory is large; the volume is large and not beautiful;

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