Control power input isolation circuit for electric automobile

Abstract

The invention relates to a control power input isolation circuit for an electric automobile. The circuit includes an anti-reverse connection circuit; the input end of the anti-reverse connection circuit is connected to a control power VCC, the output end is connected to the input end of an overvoltage protection circuit, the output end of the overvoltage protection circuit is connected to the input end of a capacitance-resistance absorbing circuit, the output end of the capacitance-resistance absorbing circuit is connected to the input end of a common mode current filter circuit, the output end of the common mode current filter circuit is connected to the input end of a Y-type capacitor isolation and filter circuit, and the Y-type capacitor isolation and filter circuit adopts Y-type capacitors CY1 and CY2 and is connected to an automotive housing through the capacitors CY1 and CY2. According to the control power input isolation circuit, a rectifier diode D1 is arranged for reverse connection prevention, a voltage stabilization diode Z1 is arranged for voltage stabilization, the capacitance-resistance absorbing circuit is arranged for voltage filter, a common mode inductor L is arranged for current filter, the Y-type capacitors CY1 and CY2 are arranged for raising the potential, the power is isolated from the automotive housing, the insulation of the control power with the automotive housing is improved, the immunity of the control power is improved effectively, and the stability of system operation is guaranteed.

Description

[0001] technical field [0002] The invention relates to the technical field of new energy vehicles, in particular to a control power input isolation circuit for electric vehicles. [0003] Background technique [0004] In the power supply mode of traditional automobile control power supply, the negative pole of the control power supply is connected to the car body, that is, the outer shell of the car. This wiring method has problems for electric vehicles, because the control part of electric vehicles uses Microelectronics technology and digital communication technology, this technology has strict requirements on the power supply quality of the control power supply, that is, the stability of the power supply must be high. If the traditional power supply method is used, once the overvoltage (atmospheric overvoltage or operating overvoltage) or high frequency strong Under the interference of the ground, it will cause the "ground" of the control power supply to be unstable, th...

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Problems solved by technology

[0004] In the power supply mode of traditional automobile control power supply, the negative pole of the control power supply is connected to the car body, that is, the outer shell of the car. This wiring method has problems for electric vehicles, because the control part of electric vehicles uses Microelectronics technology and digital communication technology, this technology has strict requirements on the power supply quality of the control power supply, that is, the stability of the power supply must be high. If the traditional power supply method is used, once the overvoltage (atmospheric overvoltage or operating overvoltage) or high frequency strong Under the interference of the control power supply, the "ground" of the control power supply will be unstable, that is, the ground potential will drift, which will lead to the unstable operation of the control system

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