Discharge control device and method for bus capacitor and electric control equipment

Abstract

The invention discloses a discharge control device for a bus capacitor, electric control equipment and a bus capacitor discharge control method. The device comprises a discharge unit which is in parallel connection with two ends of a bus capacitor, and is used for forming a discharge loop with the bus capacitor under the condition that the discharge unit is connected, so as to discharge the bus capacitor through the discharge loop; in the control unit, a sampling unit is used for sampling a bus voltage to obtain a bus sampling voltage; a voltage stabilizing source assembly is used for converting the bus voltage to obtain a first reference voltage; and a comparison unit is used for sending a first control signal to the discharge unit by taking the first reference voltage as a working voltage and a first reference value under the condition that the bus sampling voltage is smaller than the first reference value so as to control the discharge unit to be switched on. According to the scheme, the problem of potential safety hazards caused by serious heating of the discharge resistor during discharge of the bus capacitor can be solved, and the effect of improving the safety by avoiding serious heating of the discharge resistor during discharge of the bus capacitor is achieved.

Description

technical field [0001] The invention belongs to the technical field of power supply control, and in particular relates to a discharge control device for bus capacitors, electric control equipment and a method for controlling the discharge of bus capacitors, in particular to a fast control device for optimized discharge of bus capacitors, electric control equipment and the bus Capacitor discharge control method. Background technique [0002] When the controller of the electric vehicle is in use, the voltage on the bus capacitor is high voltage. When the power is disconnected, the bus capacitor needs to quickly release the voltage below the safe voltage within a certain period of time. Since the voltage changes quickly when the bus capacitor is discharged, the discharge resistor installed on the discharge branch of the bus capacitor needs to bear a large power, which is prone to heat and cause potential safety hazards. [0003] The above content is only used to assist in unde...

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Problems solved by technology

[0004] The object of the present invention is to provide a discharge control device for bus capacitors, electric control equipment and a method for controlling the discharge of bus capacitors, so as to solve the problem of serious heating of the discharge resistor and potential safety hazards when the bus capacitor is discharged, so as to avoid the discharge of the bus capacitor When the discharge resistor heats up seriously, the effect of improving safety is achieved.

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