Liming key switch contact analysis, Li Ming button switch contact point analysis, Li Ming button self-locking switch circuit solution to illustrate Li Ming button switch contact analysis, Li Ming button switch contact point analysis, Li Ming button self-locking Switch circuit solution description AY,AYP type double stage centrifugal pump Double Stage Centrifugal Pump,High-Pressure Double Stage Centrifugal Pump Shenyang pump products sales co., LTD , https://www.syipsc.com
The Liming button switch combines the normally open and normally closed button switches into a single button switch, which has a normally closed contact and a normally open contact. When not pressed, the normally closed contact is closed and the normally open contact is open. When the button is pressed, the normally closed contact is first disconnected, and the normally open contact is closed; when released, the push button switch is firstly opened by the return spring, and then the normally closed contact is closed. . The composite button is used in the interlock control circuit. 
The Liming button switch charges the capacitor when it is triggered, and the charging cycle ends when the triggering period is completed. At this time, the gate capacitance of the insulated gate FET is applied to a high voltage at the gate, the FET is turned on, and the drain of the gate is turned off. After a load, the load will work. Since the resistance of the gate to the ground is very high, usually there are several hundred megaohms, so the discharge is slow, so a discharge resistor is usually added, usually an adjustable resistor, which is used to adjust the delay time, the resistance is large, and the delay is long. The resistance is small and the delay is short. When the capacitor is dead, there is no voltage at the gate, the FET enters the off state, and the load on the drain stops working.
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Liming key switch contact analysis, Li Ming button switch contact point analysis, Li Ming button self-locking switch circuit solution description