Short-circuit protection circuit, method and system for electromagnetic lock of rail transit safety door

Abstract

The invention discloses a short-circuit protection circuit for an electromagnetic lock of a rail transit safety door. The short-circuit protection circuit comprises an optical coupler, a first resistor, a second resistor, an N-MOS tube, a diode and a resettable fuse, wherein the optical coupler is connected with a single chip microcomputer, is conducted when thesingle chip microcomputer outputs a low level signal and is cut off when the single chip microcomputer outputs a high level signal; the first resistor is connected with the optical coupler; the second resistor is connected with the first resistor; the N-MOS tube is connected with the first resistor and the second resistor, is conducted when the optical coupler is conducted and is cut off when the optical coupler is cut off; and the diode and the resettable fuse are connected with the N-MOS tube. The resettable fuse is added to a power supply loop in which the electromagnetic lock and a safety door controller are located; and when a short-circuit phenomenon appears, the resettable fuse is cut off, and the safety door controller is disconnected from the power supply circuit of the electromagnetic lock, so that the safety door controller is not burnt out due to the short-circuit phenomenon of the electromagnetic lock. In addition, the invention further discloses a short-circuit protection method and system for the electromagnetic lock of the rail transit safety door.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a short-circuit protection circuit, method and system for an electromagnetic lock of a rail transit safety door. Background technique [0002] In rail transit, the platform safety door electromagnetic lock is installed outside the safety door controller, and the two components are independently completed from production, installation and commissioning. During the operation of the subway, the safety door controller directly provides electric energy for the electromagnetic lock and controls the electromagnetic lock accordingly. Therefore, when the external electromagnetic lock is short-circuited, it will directly short-circuit the circuit supplying the electromagnetic lock inside the safety door controller, thereby Lead to burnout of the internal devices of the safety door controller. [0003] It can be seen that, when a short circuit occurs in the electromagnetic lock, how to...

AI Technical Summary

Problems solved by technology

During the operation of the subway, the safety door controller directly provides electric energy for the electromagnetic lock and controls the electromagnetic lock accordingly. Therefore, when the external electromagnetic lock is short-circuited, it will directly short-circuit the circuit supplying the electromagnetic lock inside the safety door controller, thereby Causes burnout of internal devices of the safety door controller

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