Double-coil undervoltage tripper

An undervoltage release and double-coil technology, which is applied in the direction of protection against undervoltage or no voltage, can solve the problems of unstable operating voltage, weak anti-interference ability, and small starting force of the electromagnet, and achieve High reliability pull-in, low cost, low working current effect
CN104659741AActive Publication Date: 2015-05-27美玛特电子科技(常州)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
美玛特电子科技(常州)有限公司
Publication Date
2015-05-27

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Abstract

The invention discloses a double-coil undervoltage tripper. The double-coil undervoltage tripper comprises an EMC filter circuit, a rectifying circuit, a sampling circuit, a PWM circuit, a first switch circuit, a power supply circuit, a comparing circuit, a bolt circuit, a differentiating circuit, a second switch circuit and a double-coil undervoltage electromagnet, wherein the EMC filter circuit is used for bidirectionally inhibiting interference signals generated by a power grid and an internal circuit; the double-coil undervoltage electromagnet comprises a stabilizing winding, a strong starting winding and a movable iron core. According to the double-coil undervoltage tripper, the reliable pull-in when the voltage of the power grid is higher than 85% of rated voltage is guaranteed, and the reliable tripping when the voltage of the power grid is lower than 50% of the rated voltage is guaranteed; by virtue of relatively high power of the strong starting winding and relatively low power of the stabilizing winding, the high-reliability pull-in can be achieved, and the low-power operation is simultaneously considered, so that the heating of the electromagnet is avoided. Besides, after a power supply circuit of the double-coil undervoltage tripper is connected to the second switch circuit in series, the energy efficiency of the circuit is effectively improved when the integral circuit is adequately simplified.
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Description

technical field

[0001] The invention relates to a low-voltage circuit breaker tripping technology, in particular to a double-coil undervoltage tripper. Background technique

[0002] The undervoltage release is one of the important components of circuit breakers, especially frame circuit breakers. According to GB14148.1-2006 "General Rules for Low-Voltage Switchgear and Control Equipment" and GB14048.2-2008 "Low-Voltage Switchgear and Control Equipment Part 2: Circuit Breakers", the undervoltage release is when its terminal voltage drops to A release that makes the circuit breaker disconnect with or without delay within a certain specified range. When the power supply voltage drops, or even slowly drops to the range of 70% to 35% of the rated working voltage, the undervoltage trips. When the power supply voltage of the undervoltage release is equal to 35% of the rated operating voltage of the release, the undervoltage release should be able to prevent the circuit breaker fro...

Claims

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