Vehicle control circuit, vehicular switch power supply adjuster and vehicle

Abstract

The invention provides a vehicle control circuit, a vehicular switch power supply adjuster and a vehicle; the vehicle control circuit comprises a filter circuit, an optically-coupled isolation circuit, a power control circuit and a power input end. The filter circuit receives a first enable signal and outputs a second enable signal; the optically-coupled isolation circuit is connected with the output end of the filter circuit, and is closed and then outputs an electrical signal when receiving the second enable signal; the power control circuit controls on and off of a power supply and is connected with the output end of the optically-coupled isolation circuit and the output end of a low-voltage power supply, and is closed when receiving the electrical signal; the power input end is connected with the output end of the power control circuit. The control circuit adjusts the enable signal of an original vehicle control vehicular switch power supply adjuster from a main loop directly controlling low-voltage auxiliary power to power of an isolated control feedback loop PWM (Pulse width modulation) generator, isolated control between the vehicular switch power adjuster and a vehicle is achieved, and driving safety is guaranteed.

Description

technical field [0001] The invention relates to a control circuit, in particular to a vehicle control circuit, a vehicle-mounted switching power supply regulator and an automobile. Background technique [0002] In electric vehicles, the vehicle-mounted switching power supply regulator DC / DC is a device used to control the energy transmission between the main traction power supply and the low-voltage power supply. Among them, the vehicle-mounted DC / DC auxiliary power supply mostly adopts a flyback structure closed-loop control output. Voltage and current regulation Pulse width modulated PWM frequency to get a stable output voltage. The existing vehicle-mounted DC / DC enable control is to directly control the input end of the DC / DC auxiliary power supply by the whole vehicle, by driving a relay or a metal-oxide-semiconductor field-effect transistor (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor) switch Closing realizes the on-off of the input, the vehicle enable si...

AI Technical Summary

Problems solved by technology

The existing vehicle-mounted DC / DC enable control is to directly control the input end of the DC / DC auxiliary power supply by the whole vehicle, by driving a relay or a metal-oxide-semiconductor field-effect transistor (MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor) switch Closing realizes the on-off of the input, the vehicle enable signal is not isolated from the primary side circuit of the auxiliary power supply, the electromagnetic compatibility (EMC, ElectroMagnetic Compatibility) performance is poor, and the input current needs to pass through the switch tube first, the power consumption is large, and the power supply Reduced efficiency

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