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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

Active Publication Date: 2015-05-27
美玛特电子科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the phenomenon that the existing undervoltage release has a small starting force and is prone to non-adhesion, the average working voltage of the electromagnet is unstable during normal operation, it is easy to generate heat, the circuit is too complicated, and the anti-interference Technical problems such as weak ability or difficult implementation

Method used

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  • Double-coil undervoltage tripper
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Examples

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Embodiment 1

[0030] Embodiment one, such as figure 2 as shown,

[0031] C1, L1 and C2 form an EMC filter circuit to bidirectionally suppress interference signals from the power grid and the circuit. The input power supply is connected to L and N, and connected to the full-wave rectifier bridge BG1 through the EMC filter circuit. The rectified full-wave voltage is defined as VH. VH is filtered by the voltage dividing sampling circuit composed of R1, R2 and C3 to form a sampling voltage defined as VS.

[0032] VS is isolated by the non-inverting follower U1A and transmitted to the PWM circuit composed of R3, R4, R5, R6, C4 and U1B. The duty cycle of the square wave signal output by the PWM circuit is inversely proportional to VS, that is, the higher the VS, the higher the duty cycle. The smaller it is, in order to keep the working voltage of the winding at a constant value.

[0033] The square wave signal output by the PWM circuit is limited by R7 to control the first switch circuit comp...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/24
Inventor 吴志祥方晓毅徐维邹一琴
Owner 美玛特电子科技(常州)有限公司
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