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Pulse width modulation (PWM) control circuit of elevator brake

A technology for elevator brakes and control circuits, which is applied in elevators, hoisting devices, transportation and packaging, etc., can solve the problems of high noise in elevator brakes, achieve the effects of curbing freewheeling currents, eliminating hidden dangers, and working stably

Active Publication Date: 2012-11-28
SHIJIAZHUANG WULON BRAKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an elevator brake PWM control circuit to solve the problem of high noise in the elevator brake, to overcome the adverse effects of the use of thyristor voltage regulation on the reliability of the elevator brake, and to meet the normal use of the elevator Require

Method used

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  • Pulse width modulation (PWM) control circuit of elevator brake

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Embodiment Construction

[0036] Such as figure 1 As shown, the control circuit of the present invention includes an EMI filter 1, an AC / DC converter 2, a high-end power switch circuit 3, a low-end power switch circuit 4, a pulse width modulation circuit 5, an excitation voltage adjustment feedback circuit 6, and a holding voltage adjustment feedback circuit. Circuit 7, excitation control circuit 8, residual magnetization control circuit 9, freewheeling circuit 10, discharge circuit 11, DC power supply 12 and other parts.

[0037] The output of the EMI filter 1 is connected to the AC / DC converter 2 , the positive output terminal of the DC output of the AC / DC converter 2 is connected to the high-end power switch circuit 3 , and the negative output terminal is connected to the low-side power switch circuit 4 . The output end of the high-end power switch circuit 3 is the high-end output node A of the control circuit, the output end of the low-end power switch circuit 4 is the low-end output node B of the ...

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Abstract

The invention relates to a pulse width modulation (PWM) control circuit of an elevator brake. The PWM control circuit comprises an electro-magnetic interference (EMI) filter, an alternating current / direct current converter, a high-end power switching circuit, a low-end power switching circuit, a pulse width modulation circuit, an excitation voltage regulation feedback circuit, a sustaining voltage regulation feedback circuit, an excitation control circuit, a residual magnetism removal control circuit, a freewheeling circuit, a bleeder circuit, a direct current power supply and the like. The PWM control circuit adopts a pulse width modulation mode to control the direct current working voltage of the elevator brake, thereby eliminating electromagnetic noise of the elevator brake, and improving the working stability, reliability and interference resistance of the elevator brake. The PWM control circuit can be used in various elevator brakes with different structures and other electromagnetic brakes, and can be provided with various backup and online uninterrupted power supplies (UPS).

Description

technical field [0001] The invention relates to a control circuit of a brake electromagnet, in particular to a PWM control circuit of an elevator brake. Background technique [0002] Elevator brakes play a pivotal role in elevator safety protection. The failure of the brakes will directly cause the elevator to slide, which in turn can lead to very serious vicious safety accidents such as shearing, squatting, and roofing. Every normal operation and start and stop of the elevator requires the participation of the brake, and the execution of most of the electrical protection of the elevator (door lock, limit, limit, overspeed, etc.) depends on the brake. Therefore, once the elevator brake fails, all the electrical safety protection devices of the elevator (such as overspeed safety gear, rope clamp, terminal buffer, etc.) will be useless. Therefore, as a special equipment elevator, the reliability of the brake is particularly important in terms of the particularity of its use a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66D5/30
CPCB66B1/32
Inventor 芮振璞
Owner SHIJIAZHUANG WULON BRAKE
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