Elevator brake silent operation control circuit

Abstract

The invention relates to an elevator-brake mute-operation control circuit, which comprises parts, such as a time-delay circuit, an exciting-voltage pulse-width modulating circuit, a modulation-switching circuit, a maintaining-voltage pulse-width modulating circuit, a direct-current stabilized-voltage power supply, a rectifying and wave-filtering circuit, a direct-current wave chopper, a freewheeling circuit, an exciting-voltage tracking and holding circuit, a maintaining-voltage tracking and holding circuit and the like. In the invention, direct-current wave-chopping type adjustment for a direct-current working voltage applied to a magnetic-device coil is carried out through a pulse-width modulation-controlling mode, so that low-frequency electromagnetic noise is eliminated, the mute operation of an elevator brake is realized, the use requirements of a machine-room-less tractor brake are met, meanwhile, various potential safety hazards produced by using a controlled-silicon voltage-regulating circuit are also eliminated, an exciting voltage and a maintaining voltage on the magnetic-device coil are kept unchanged when an electric-network voltage is changed, and the elevator-brake mute-operation control circuit is stable and reliable in working.

Description

technical field [0001] The invention relates to a control circuit of a braking electromagnet, in particular to a control circuit for silent operation of an elevator brake. Background technique [0002] At present, most elevator brake controllers use thyristor phase-shift voltage regulation to provide excitation voltage and maintenance voltage. Although this kind of silicon controlled rectifier phase-shifting and voltage-regulating working method can improve the reliability of the elevator brake, however, the use of silicon-controlled rectifier phase-shifting and voltage-regulating working method will generate a strong high-order voltage in the control circuit. Harmonic components not only pollute the power grid, but also cause the elevator brake to generate large electromagnetic noise during operation, and this electromagnetic noise can be transmitted to the elevator car through the resonance amplification of the steel structure of the elevator and the elevator shaft . In ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a control circuit for silent operation of elevator brakes to solve the problem of high electromagnetic noise of elevator brakes and realize silent operation of elevator brakes

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