Method for reducing loss of electromobile vehicle-mounted inverter and improving current output capacity of electromobile vehicle-mounted inverter

Abstract

The invention discloses a method for reducing loss of an electromobile vehicle-mounted inverter and improving current output capacity of the electromobile vehicle-mounted inverter, which is characterized in that a given voltage vector is formed by combining six basic voltage vectors with two zero current vectors so as to be equalized into a circular voltage rotary vector, and the time of the zero current vectors is completely 111, wherein 111 represents that three high-end tubes are all opened. In the invention, a novel control strategy is introduced to solve the problems of more switching times, low efficiency and asymmetric loads brought by a conventional modulation mode, so heating is reduced, the efficiency of the inverter is improved, heat asymmetry between an IGBT (Insulated Gate Bipolar Transistor) and a diode is reduced, and the current output capacity of the inverter is improved.

Description

technical field [0001] The invention relates to an electronic and electrical method for automobiles, in particular to an electrical and electronic method for an inverter onboard an electric vehicle. Background technique [0002] In electric / hybrid vehicles, the vehicle inverter is the main load of the high-voltage battery, which directly provides energy to the vehicle's drive motor, and its current is large, and its power is tens or even hundreds of kilowatts. So even if it is very efficient, it will generate a loss of several kilowatts. A big technology bottle of electric vehicles is its short cruising range, so it is very meaningful to be able to improve efficiency. In addition, the loss of several kilowatts will place high demands on the heat dissipation of the inverter. The power of the cooling water pump of the electric vehicle is small, and the high loss makes it difficult to bear. Ordinary SVPWM modulation mode, when the electric vehicle motor is dragging or braking...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method for reducing the loss of the vehicle-mounted inverter of an electric vehicle and improving its current output capability, which mainly solves the high loss and low efficiency of the current electric vehicle inverter; the excessive heat dissipation load of the cooling system; IGBT and diode loads in the inverter are seriously asymmetrical, which greatly limits the current output capability of the inverter

[0012] The beneficial effect of the present invention is that: a new control strategy is introduced to solve the problems of many switching times, low efficiency and load asymmetry caused by the traditional modulation method, so as to reduce heat generation, improve inverter efficiency and reduce IGBT , the thermal asymmetry between the diodes improves the current output capability of the inverter

Images