Composite power system of electric vehicle DC-DC converter and control method

Abstract

The invention discloses a composite power system of an electric vehicle DC-DC converter and a control method. The composite power system comprises a first MOS tube, a second MOS tube, a third MOS tube, a first diode, a second diode, a third diode, the DC-DC converter, a battery pack, a super capacitor, a motor inverter and a DSP controller which is used for controlling the first MOS tube, the second MOS tube, the third MOS tube and the DC-DC converter. A composite power source is connected or disconnected by controlling the MOS tubes and works efficiently according to different schemes and in different modes according to the magnitude of power, and both the super capacitor and the battery pack can work independently without passing through the DC-DC converter. The composite power system of the electric vehicle DC-DC converter and the control method improve the independent working efficiency of two common power sources; when the DC-DC converter works in a boosting mode, highest-power output is realized and high-efficiency work of the composite power system is realized.

Description

technical field [0001] The invention belongs to the field of vehicle-mounted power supplies for electric vehicles, and relates to a composite power supply system and a control method for DC-DC converters of electric vehicles. Background technique [0002] With the increasingly prominent energy crisis and increasingly serious environmental pollution, people's awareness of energy conservation, emission reduction and sustainable development has been continuously enhanced. With the rapid development of the automobile industry, the R&D and production of green and environmentally friendly new energy vehicles have attracted more and more attention from all over the world, and zero-emission electric vehicles are an inevitable trend in the development of new energy vehicles. [0003] Battery packs for electric vehicles have the characteristics of high energy density but relatively low power density. Only the battery pack cannot meet the high power output requirements of the car unde...

AI Technical Summary

Problems solved by technology

[0004] A composite power supply generally includes one or more DC-DC converters, but multiple DC-DC converters will increase the cost of the system; existing patents or related products only have one DC-DC converter, batteries and supercapacitors Only one can work alone without the DC-DC converter, which does not solve the problem that both the battery and the supercapacitor can work alone without the DC-DC converter.

Images