Power source of elevator contracting brake

Abstract

The invention discloses a power source of an elevator contracting brake. The power source comprises a direct-current power source and a chopper circuit. The elevator contracting brake comprises a contracting brake coil, an input end of the chopper circuit is connected with the direct-current power source, and an output end of the chopper circuit is connected with the contracting brake coil. The chopper circuit comprises a microcontroller, a switching tube, a freewheeling diode, an output current detection circuit, an output voltage detection circuit and a switching tube drive circuit. The switching tube is serially connected in a main circuit of the chopper circuit, and a control electrode of the switching tube is connected with a drive signal output end of the switching tube drive circuit. An output end of the output current detection circuit and an output end of the output voltage detection circuit are respectively connected with the microcontroller, and a control signal output end of the microcontroller is connected with a control end of the switching tube drive circuit. An anode of the freewheeling diode is connected with a cathode of the output end of the chopper circuit, and a cathode of the freewheeling diode is connected with an anode of the output end of the chopper circuit. The power source has advantages of small device quantity, low cost, reduction of direct-current voltage pulsation, few circuit faults and low later maintenance cost.

Description

[0001] [technical field] [0002] The invention relates to an elevator brake, in particular to an elevator brake power supply. [0003] [Background technique] [0004] Elevator brakes are one of the most important safety devices for elevator products. Due to different brands of elevators and different load tonnages, the required brake force is also different. The resulting brake coil parameters are also varied. The gate voltage is DC200V and DC110V, and the maintenance voltage is also different. At present, domestic elevator manufacturers generally use silicon controlled rectifiers to chop AC power into DC current and rectify AC power into DC power, and then use BUCK circuit to transform into required DC power. [0005] In the prior art, the pulsation component of the DC voltage obtained by the thyristor chopping method is relatively large, which may lead to insufficient opening of the brake and operation with the brake, resulting in the risk of brake wear; the BUCK circuit me...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the pulsation component of the DC voltage obtained by the thyristor chopping method is relatively large, which may lead to insufficient opening of the brake and operation with the brake, resulting in the risk of brake wear; the BUCK circuit method has many circuit components, The cost is high, which increases the cost of failure points and post-maintenance

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