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Pure simulation circuit for realizing undervoltage instantaneous release

An analog circuit and undervoltage technology, applied in the field of pure analog circuits, can solve the problems of weak anti-electromagnetic interference ability and poor real-time response characteristics.

Active Publication Date: 2009-10-07
SEARI ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Different types of single-chip microcomputers are generally used in the existing undervoltage release control circuits, and the logic processing function and PWM modulation function of the single-chip microcomputer are used for breaking control. The real-time response characteristics are poor and the anti-electromagnetic interference ability is weak.

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  • Pure simulation circuit for realizing undervoltage instantaneous release
  • Pure simulation circuit for realizing undervoltage instantaneous release
  • Pure simulation circuit for realizing undervoltage instantaneous release

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Embodiment Construction

[0028] For undervoltage instantaneous tripping, there are the following requirements:

[0029] When the power supply voltage is higher than 85% of the rated voltage of the undervoltage release, the control circuit ensures that the excitation coil is connected, the armature is pulled in, and the circuit breaker is in a normal operating state; when the power supply voltage drops to 85% of the rated voltage of the undervoltage release 35% to 70%, the control circuit can choose to turn off the excitation coil.

[0030] In the design of the instantaneous undervoltage release, two requirements must be achieved. One is that it needs to respond quickly to the change of the grid voltage, the armature is stable, and the tripping action is fast when the voltage is undervoltage; When the coil is engaged for a long time, it will not overheat and burn out.

[0031] According to the above requirements, the present invention provides a pure analog circuit 100 for realizing undervoltage tripp...

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Abstract

The invention discloses a pure simulation circuit for realizing undervoltage release. The circuit comprises: a rectifying circuit connected to an alternating current input power supply, a pull-in maintaining circuit connected to the rectifying circuit to generate a signal of the pull-in maintaining circuit, an undervoltage threshold decision circuit connected to the rectifying circuit to judge the undervoltage threshold, an initial pull-in current delay circuit connected to the undervoltage threshold decision circuit, an MOSFET drive circuit connected to the outputs of the rectifying circuit, the pull-in maintaining circuit and the initial pull-in current delay circuit and then a drive signal is output after the outputs of the three circuits are integrated, and an electromagnet actuating mechanism connected to the MOSFET drive circuit to control the pull-in or breakoff of the electromagnet according to the drive signal.

Description

technical field [0001] The invention relates to an undervoltage release control circuit, more specifically, a pure analog circuit for realizing undervoltage instantaneous release. Background technique [0002] Different types of single-chip microcomputers are generally used in the existing undervoltage release control circuits, and the logic processing function and PWM modulation function of the single-chip microcomputer are used for breaking control. The real-time response characteristics are poor and the anti-electromagnetic interference ability is weak. Contents of the invention [0003] The invention provides a pure analog circuit for realizing undervoltage instantaneous tripping. [0004] According to the present invention, a purely analog circuit for realizing undervoltage tripping is provided, comprising: [0005] rectification circuit, connected to the AC input power supply; [0006] The pull-in circuit is maintained, connected to the rectifier circuit, and the p...

Claims

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Application Information

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IPC IPC(8): H02H3/24H01F7/18H01H47/02
Inventor 张聪施惠冬谈永根
Owner SEARI ELECTRIC TECH