Bidirectional DC/DC (direct current/direct current) control system and working method thereof

Abstract

The invention provides bidirectional DC / DC (direct current / direct current) control system which comprises an energy storage device and a conversion circuit, wherein the conversion circuit is connected with a working unit with an energy feedback function. The DC / DC control system also comprises a logic circuit and a control unit, wherein the control unit sends out a control signal CTR, a first control wave signal PWM1 and a second control wave signal PWM2 to the logic circuit; the logic circuit is used for detecting current IL in the conversion circuit and control the conversion circuit according to the current IL, the control signal CTR, the first control wave signal PWM1 and the second control wave signal PWM2. By utilizing the technical proposal, the problems of disorder control, imprecise control and low energy transfer efficiency caused by energy countercurrent when two switching tubes are simply used for complementary conduction control in the traditional technical proposal can be overcome, thus the conversion circuit of the system can be effectively controlled, energy flow between the energy storage device and the working unit can be effectively improved and controlled, and the working performance of the motor can be effectively improved.

Description

technical field [0001] The invention relates to a DC / DC control system and its working method, in particular to a bidirectional DC / DC control system and its working method on an electric vehicle. Background technique [0002] As we all know, electric vehicles use the motor as the power source of the vehicle to drive the vehicle, and the energy storage device (power battery) that provides electric energy for the motor has also become an indispensable part of the electric vehicle. The communication between the two and The energy transfer system determines whether the energy storage device can provide the motor with a working voltage and current that meet the requirements; at the same time, when the electric vehicle brakes or goes downhill, the motor can recover the kinetic energy of the wheels, thereby converting the kinetic energy of the wheels into Electric energy charges the energy storage device to realize energy feedback. [0003] Through the above, a bidirectional DC / DC...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low energy transmission efficiency between the energy storage device and the working unit with energy feedback and poor working performance of the working unit in the prior art, and provide a bidirectional DC / DC control system to effectively control The energy flow between the energy storage device and the working unit can effectively improve the working performance of the working unit

Images