Electromagnetic type undervoltage tripping device

Abstract

The invention discloses an electromagnetic type undervoltage tripping device which comprises a filter circuit, a full-bridge rectifying circuit, a sampling circuit, a single-chip microcomputer circuit, a drive circuit, an electromagnet and a power supply circuit for providing power for the single-chip microcomputer circuit and the drive circuit. The power supply input end of the filter circuit is connected with a power grid. The output end of the filter circuit is connected with the input end of the full-bridge rectifying circuit. The output end of the full-bridge rectifying circuit is connected with one end of the electromagnet, the input end of the power supply circuit and the input end of the sampling circuit. One output end of the power supply circuit is connected with the single-chip microcomputer circuit. The other output end of the power supply circuit is connected with the drive circuit. The output end of the sampling circuit is connected with the single-chip microcomputer circuit. The output end of the single-chip microcomputer circuit is connected with the drive circuit. The drive circuit is connected with a coil winding of the electromagnet. The electromagnetic type undervoltage tripping device is reliable in attraction, safe in operation, small in coil heat value and capable of achieving instantaneous undervoltage tripping and delayed undervoltage tripping without increasing the circuit cost.

Description

technical field [0001] The invention relates to the field of low-voltage electrical releases, in particular to an electromagnetic undervoltage release. Background technique [0002] The undervoltage release is one of the important components of circuit breakers, especially frame circuit breakers. The undervoltage release is a release that makes the circuit breaker disconnect with or without delay when its terminal voltage drops to a certain range. When the power supply voltage drops, it even slowly drops to the rated working voltage. Within the range of 70% to 35% of the release, the undervoltage release should operate. 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 from fully closing. The coil of the release is de-energized, and the movable armature in the coil is ejected by the return spring—tripping; when the power supply voltag...

AI Technical Summary

Problems solved by technology

However, if the DC resistance of the coil is too low, the load of the modulation device will increase seriously, and the modulation device will easily heat up, or seriously affect the safety of the modulation device, or the cost of the modulation device needs to be increased in order to improve the safety of the modulation device

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