Vehicle-mounted ECU power supply input circuit

Abstract

The invention discloses a vehicle-mounted ECU (Electronic Control Unit) power supply input circuit. The circuit comprises a first filtering loop, a first driving circuit, a first electrostatic protection circuit, a hard turn-off circuit, a second filtering loop, a second driving circuit and a second electrostatic protection circuit, wherein the second driving circuit and the second filtering loop are sequentially connected, an output end of the second filtering loop is connected with the first driving circuit through the hard turn-off circuit, the first driving circuit is further connected with the first electrostatic protection circuit and the first filtering loop; the first filtering loop comprises an MOS tube Q1, an MOS tube Q2, a fuse F1, a common mode inductor LB1, a capacitor C2 and a capacitor C3, a drain electrode of the MOS tube Q1 is connected with an input power supply VBAT24V, and a grid electrode of the MOS tube Q1 is connected with a grid electrode of the MOS tube Q2. The circuit is advantaged in that the vehicle-mounted ECU is powered, and the anti-interference capability and power supply stability can be improved.

Description

technical field [0001] The invention relates to the field of electronic circuits, and more specifically relates to a vehicle-mounted ECU power supply input circuit. Background technique [0002] With the rapid development of new energy vehicles, the mileage and horsepower of the vehicle will increase day by day, so the power of the power battery and the motor will also increase accordingly. In addition, the number of in-vehicle ECUs is also increasing. In this way, the electrical system of new energy vehicles will become more complex and the electrical environment will become more severe, thus increasing the requirements for the anti-interference ability of the vehicle ECU power management system. However, for the upstream power management chip, the manufacturer has not targetedly updated and improved its anti-interference ability, or the design cost will be greatly increased, and the power supply stability will also be affected by the weak anti-interference ability. [00...

AI Technical Summary

Problems solved by technology

However, it does not provide a circuit structure or method for improving the anti-interference ability and power supply stability of the vehicle-mounted ECU power supply circuit

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