Automobile reversing camera withstand voltage pulse design
The circuit in this example uses a simple comparator circuit to delay the power-up time for the car reversing camera. Automakers typically use a backup light circuit to power the camera for reversing. In an automatic car, when shifting from park to driving (or vice versa), the gear shifts through the reverse gear, and the camera adds a short power pulse. This sudden voltage pulse is not conducive to sensitive circuitry in the camera and may shorten its life. This example presents a simple and inexpensive way to avoid this. 
The picture circuit generates a 2s power supply delay for the car's reversing camera.
The input of this circuit is connected to the positive and negative terminals of the backup lamp. The circuit powers the camera through a MOSFET. R1 and C1 form a time delay element (Reference 1). When the backup light is on, it slowly charges the capacitor through resistor R1. R3 and R4 form a voltage divider that sets the inverting terminal of the comparator to 6V. At the instant when the power supply is applied to the circuit, the comparator output is low and the MOSFET is turned off. When the voltage of C1 rises above 6V, the comparator output is high and the MOSFET is turned on. The values ​​of R1 and C1 set the delay time to 2.2 seconds. According to the charging time of the capacitor, this time value can be calculated by the following formula:
VC(t)=VIN×[1-e-(t/R1C1)],
6=12×[1-e-(t/33kΩ×100μF)], and t=2.287s
Changing the value of R1 or C1 can set different delay times. When the shift lever is switched from the reverse position to any other position, the capacitor C1 is discharged through D1, R3 and R4 within 60 ms. When you switch between parking and driving, when the lever passes the reverse position, the camera will not be powered due to a 2s time delay.
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