Brake Energy Recovery System of Electric Vehicle

Abstract

A system for recover brake energy of electric vehicle includes the permanent magnet synchronous motor of the original vehicle, three-phase alternating current switch, three-phase full-bridge rectifierand high-voltage battery pack, Brake energy recovery switch, energy storage buffer capacitor, DC buck charger and low voltage battery, A permanent magnet synchronous motor is connected with a three-phase full-bridge rectifier through a three-phase alternating current switch, The output of the three-phase full-bridge rectifier is connected to an energy storage buffer capacitor. The output of the energy storage buffer capacitor is provided with two channels. A low-voltage battery is connected through a DC buck charger, A high-voltage battery pack is connected with the other way through a high-voltage charging isolation diode. the output end of the low-voltage battery is connected to the control end of the three-phase alternating current switch through the brake energy recovery switch, A low-voltage battery is use for supplying pow to that low-voltage electric load of the original vehicle. From the practical application of the electric vehicle, the invention can charge the high-voltage battery pack under the high voltage, and when the low-voltage battery pack is lower than the high-voltage battery pack, the low-voltage battery pack on the vehicle is char, and the energy generated bybraking can be recovered.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a braking energy recovery system for electric vehicles. Background technique [0002] Since the birth of electric vehicles, their cruising performance has always been the focus of attention. In addition to improving energy storage and driving methods, braking energy recovery is a major development direction. For this reason, many electric vehicle manufacturers want to effectively improve the cruising range of electric vehicles. A lot of brake energy recovery systems have been developed, which are widely used in electric vehicles. However, since the braking process is the process of generating voltage from the highest to the lowest, and the instantaneous current impact is relatively large, under the limitation of manufacturing cost, most of them have the problem of low braking energy recovery rate. Contents of the invention [0003] The purpose of the pres...

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Problems solved by technology

However, since the braking process is the process of generating voltage from the highest to the lowest, and the instantaneous current impact is relatively large, under the limitation of manufacturing cost, most of them have the problem of low braking energy recovery rate

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