Dual power supply and energy crossfeed system used for motor drive

Abstract

The present invention provides a dual power supply and energy crossfeed system used for motor drive. The system comprises a dual power supply switching circuit connected between a dual power supply and an inverter and used for switching the operation modes of a power supply mode, a charging mode, a crossfeed mode or a power supply / crossfeed mode of the dual power supply; the inverter connected between the dual power supply switching circuit and a motor and used for converting a DC outputted by the dual power supply into an AC, and driving the motor or converting the AC fed back by the motor into the DC to charge the dual power supply; a control circuit used for sending a control command of switching the operation mode of the dual power supply and controlling the inverter to drive the motor to operate according to a received control instruction and the acquired current and voltage information; a drive circuit used for controlling the dual power supply switching circuit to switch the operation mode of the dual power supply and controlling the inverter to drive the motor to operate according to the control command. According to the present invention, an independent and bidirectional DC / DC converter is saved, and the cost, the size and the weight of the system are reduced.

Description

technical field [0001] The invention relates to a dual power supply and energy mutual feedback system for motor drive, belonging to the fields of power electronics and motor drive. Background technique [0002] Motors are widely used in daily life, such as refrigerators, washing machines, electric windows, hybrid cars and elevators. Usually, in some application fields with special requirements, a dual power supply system is equipped. When the first power supply loses power or fails, the second power supply can be activated or supply power for a short time to ensure that the equipment or application can be stopped in the state that people need. [0003] For example, in the ISG system of a hybrid electric vehicle, the motor is powered by two power sources, and it is required that the first power source and the second power source can supply power to the motor respectively, and energy exchange between the first power source and the second power source can be carried out, and e...

AI Technical Summary

Problems solved by technology

[0008] The present invention solves the problem that the existing dual power supply motor drive system adopts an independent DC / DC converter to convert the first power supply or the second power supply, resulting in higher system cost and larger volume and weight of the system, and further A dual power supply and energy mutual feedback system for motor drive is proposed, which specifically includes the following technical solutions:

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