Bus capacitor discharging circuit of vehicle motor controller

Abstract

The invention relates to a capacitor discharging circuit, in particular to a bus capacitor discharging circuit of a vehicle motor controller, and solves the problems of complex signal transmission, influence to the discharge speed, generation of signal interference, increasing of the circuit load and the like caused by unreasonable control mode of a controllable release switch in an active discharging circuit adopted by a bus capacitor discharging circuit of an existing vehicle motor controller, and solves the problems of high power consumption and high failure risk caused by the mode of a combination of an active discharging circuit and a passive discharging circuit adopted by the bus capacitor discharging circuit of the existing vehicle motor controller. The bus capacitor discharging circuit of the vehicle motor controller is composed of at least one active discharging circuit connected with the two ends of a bus capacitor in parallel, wherein the active discharging circuit is formedby connecting an active discharge resistor and a controllable release switch in series; the opening and closing of the controllable release switch are directly controlled by a vehicle key switch signal; or a motor controller MCU of the vehicle acquires the vehicle key switch signal and outputs a signal for controlling opening and closing of the controllable release switch.

Description

technical field [0001] The invention relates to a capacitor discharge circuit, in particular to a motor controller bus capacitor discharge circuit for a vehicle. Background technique [0002] New energy vehicles work in a high-voltage environment. With the rapid development of new energy vehicles, people pay more and more attention to the high-voltage safety of new energy vehicles, and the high-voltage safety requirements of the electric drive system of new energy vehicles are also getting higher and higher. [0003] The bus capacitor is an important part of the power circuit of the automotive motor controller. Together with the automotive power battery, it provides a reliable and stable power supply for the power module, smoothing the bus voltage and reducing the line inductance, thereby ensuring the good operation of the drive motor. When the vehicle is running, the bus capacitor is always in a high voltage state. If the vehicle is normally stopped and the power is cut of...

Images