The following is the circuit diagram of [LM431 designed delay switch circuit] Delay switch circuit designed by LM431
Working principle: R1 and C1 form a delay circuit, the delay time is required to be 1 second, and C1 should use a tantalum capacitor that can work at -55 ~ 125 °C. After power-on, the LM431 input terminal is low level, the output terminal is about 23 volts, Q1 and Q2 are turned on, the ignition coil is energized for a short time, and the current is about 24 amps. After one second of power-on, the LM431 input terminal rises to 2.5 volts due to At this time, the output of the LM431 is about 2. volt, so the Zener Z2 with a regulation value of 6.2V should be connected in series at its output, so that Q1 and Q2 can be turned off and the ignition coil is de-energized. The ignition coil is an inductive load, the DC resistance is about 1 ohm, and the working power supply is a 24 volt battery. The measured current is about 25 amps. The operating temperature range of this circuit can reach -40 ~ 121 °C, which can fully meet the requirements of automotive electronics.
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