Vehicle-mounted filtering delay shutdown circuit

Abstract

The invention discloses a vehicle-mounted filtering delay shutdown circuit. The circuit comprises an ACC positive port, the ACC positive port is connected with one end of a fuse resistor FS, and the other end of the fuse resistor FS is connected a resistor R0, a capacitor C3 and a resistor R6 at the same time. The resistor R0 is also connection with a resistor R2 and a resistor R1 in parallel, which are connected in series. The other end of the resistor R6 is connected with the base electrode of a triode Q2. Two ends of the capacitor C3 are respectively connected with one end of an inductor L3 and one end of an inductor L2, and the other end of the inductor L3 is connected with the alternating-current positive input AC+ port of a rectifier D5 and one end of a capacitor C4. The other end of the inductor L2 is connected with the alternating-current negative input AC- port of the rectifier D5 and the end of the capacitor C4. The circuit has a good time delay effect, is achieved through employing discrete elements, and has the advantages of simple structure, low cost, reasonable design, good rectification and filtering effects and the stable power supply.

Description

technical field [0001] The invention relates to a vehicle-mounted circuit, in particular to a vehicle-mounted filter delay shutdown circuit. Background technique [0002] The switch control signal of the on-board electronic equipment is generally taken from the ACC (the power supply for the car, controlled by the car key, which supplies power for some components such as the on-board electronic equipment) signal on the car. When the car key is inserted into the keyhole and turned to the ACC position, the car Electronic devices on the computer, such as radios, cigarette lighters, etc., are powered on. When the car is ignited, a strong current is needed. At this time, ACC stops supplying power. After the car is ignited, ACC starts to supply power again. In this state, the electronic equipment on the car will often stop working due to the shutdown of the ACC control voltage. In order to avoid this situation, there is a detection circuit using a single-chip microcomputer to moni...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing technologies do not process the ACC control voltage, but only increase the capacity of the filter capacitor at the power input terminal of the vehicle electronic equipment to achieve delayed shutdown, but the effect of delay (that is, delay) is negligible. If the ACC voltage is turned off for more than 20ms (milliseconds), the on-board electronic equipment will crash or shut down.

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