Electromagnetic undervoltage release

Abstract

The invention relates to the technical field of undervoltage releases, in particular to an electromagnetic undervoltage release which is provided with a forced start-up circuit; the forced start-up circuit comprises a filter circuit connected with a power grid, a voltage-reduction capacitor, a bridge rectification circuit, a start-up capacitor, an energy-storage voltage detection circuit for detecting the voltage of the start-up capacitor, a power grid voltage detection circuit for detecting the voltage of the power grid, a control circuit and a system power circuit for supplying power to the control circuit; the output end of the filter circuit is serially connected with the voltage-reduction circuit and then connected with the bridge rectification circuit, the output end of the bridge rectification circuit is connected with the anode of the start-up capacitor and an electromagnetic coil, the cathode of the start-up capacitor is grounded, the other end of the electromagnetic coil is serially connected with a switch circuit controlled by the control circuit, and the other end of the switch circuit is grounded; and the output ends of the energy-storage voltage detection circuit and the power grid voltage detection circuit are connected with the input end of the control circuit. The invention solves the technical problems that the coil has large heating quantity, the starting torque of the undervoltage release is small, the circuits are excessively complex, and the like in the prior electromagnetic undervoltage release.

Description

technical field [0001] The invention relates to the technical field of undervoltage releases, in particular to an electromagnetic undervoltage release. Background technique [0002] The undervoltage release is the core component of the low-voltage switch. There are two types of working methods for the undervoltage release to drive the ejector rod: electromagnetic type and permanent magnet type. [0003] Compared with the permanent magnet type undervoltage release, the electromagnetic type undervoltage release has a simple circuit. After the power is cut off, the ejector rod has the ability of "self-resetting" under the action of the spring force. [0004] Existing electromagnetic undervoltage releases generally have problems such as high coil heat generation, low starting torque of the undervoltage release, or too complicated circuits. Contents of the invention [0005] The technical problem to be solved by the present invention is: to solve the technical problems of the ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to solve the technical problems of the existing electromagnetic undervoltage release, such as high calorific value, small starting torque or too complicated circuit when undervoltage tripping, the present invention provides an electromagnetic undervoltage release The release, which has low heat generation and large starting torque, is suitable for undervoltage tripping occasions required by various low-voltage switches such as self-suction type and suction-assisted type.

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