Short-circuit protection circuit, method and system for electromagnetic lock of rail transit safety door
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A technology for protecting circuits and rail transit, which is applied in the electronic field and can solve problems such as burnout of safety door controller devices
Active Publication Date: 2016-06-15
CHONGQING CHUANYI AUTOMATION
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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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Embodiment 1
[0032] figure 1 A circuit diagram of a short-circuit protection circuit for an electromagnetic lock of a rail transit safety door provided by the present invention. Such as figure 1 As shown, the short-circuit protection circuit of the rail transit safety door electromagnetic lock includes:
[0033] Connected with the single-chip microcomputer 10, it is turned on when the single-chip microcomputer 10 outputs a low-level signal, and an optocoupler 11 that is cut off when the single-chip microcomputer 10 outputs a high-level signal;
[0034] a first resistor R1 connected to the optocoupler 11;
[0035] a second resistor R2 connected to the first resistor R1;
[0036] An N-MOS transistor 12 connected to the first resistor R1 and the second resistor R2, which is turned on when the optocoupler 11 is turned on, and turned off when the optocoupler 11 is turned off;
[0037] A diode 13 and a resettable fuse 14 connected to the N-MOS tube 12;
[0038] Wherein, the source of the N-...
Embodiment 2
[0049] figure 2 It is a flowchart of a short-circuit protection method for an electromagnetic lock of a rail transit safety door provided by the present invention. It should be noted that this method is based on the protection circuit described in the first embodiment. The short-circuit protection method of the rail transit safety door electromagnetic lock includes:
[0050] S10: When the electromagnetic lock is in the locked state and the single chip microcomputer sends a high-level signal, the safety door controller detects the state of the electromagnetic lock at least once when the preset time arrives.
[0051] The short circuit phenomenon occurs when the electromagnetic lock changes from the locked state to the unlocked state. Therefore, when the electromagnetic lock is in the locked state and the single-chip microcomputer sends a high-level signal, the safety door controller obtains the state of the electromagnetic lock through the sensor in the electromagnetic lock to...
Embodiment 3
[0060] The rail transit safety door electromagnetic lock short-circuit protection system includes the protection circuit described in Embodiment 1, a single-chip microcomputer connected with the protection circuit, an electromagnetic lock, and a safety door controller connected with the electromagnetic lock.
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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...
Claims
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Application Information
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