Multi-mode switching composite power supply topological structure of electric vehicle and control method

Abstract

The invention discloses a multi-mode switching composite power supply topological structure of an electric vehicle and a control method. The multi-mode switching composite power supply topological structure of the electric vehicle comprises a first voltage stabilization capacitor, a second voltage stabilization capacitor, a battery pack, a super capacitor, a motor inverter, a voltage sampling circuit, a current sampling circuit and an ARM controller, wherein a first energy storage inductor, a first MOS tube and a fourth diode form a main booster circuit; a second energy storage inductor, a second MOS tube and a third diode form an auxiliary boost-buck circuit; the controller controls the MOS tubes to be connected or disconnected according to the actual requirement of the electric vehicle, to realize the switching or combination of the main booster circuit and the auxiliary boost-buck circuit; during output, on the basis of guaranteeing the power performance of the electric vehicle, the optimal boosting mode of the super capacitor or the running charging mode is chosen, to decrease energy loss; during braking, the super capacitor is chosen preferentially to recover energy independently, and to ensure system safety, the boosting mode is adopted to charge the battery pack when the super capacitor is about to be fully charged, so that the stability of braking energy recovery is guaranteed.

Description

technical field [0001] The invention belongs to the field of on-board power supplies of electric vehicles, and relates to a multi-mode switching composite power supply topology and control method for electric vehicles. Background technique [0002] Traditional internal combustion engine vehicles have the disadvantages of low efficiency and environmental pollution. In contrast, high efficiency and zero emissions give pure electric vehicles an absolute advantage. While advancing technology, the country is also actively introducing various policies to promote the development and popularization of electric vehicles . However, the vehicle energy storage system has become one of the bottlenecks restricting the development of electric vehicles. Although the commonly used lithium battery energy storage system has high energy density, its power density is relatively low, which adversely affects the performance of the vehicle. The supercapacitor has the characteristics of high energy...

AI Technical Summary

Problems solved by technology

However, the vehicle energy storage system has become one of the bottlenecks restricting the development of electric vehicles. Although the commonly used lithium battery energy storage system has high energy density, its power density is relatively low, which adversely affects the performance of the vehicle.

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