DSP-based flush type electric automobile frequency conversion control method and device

Abstract

The present invention relates to embedded frequency varying control apparatus based on DSP for electromobile and its control method. The present invention has battery to provide the system with electric energy via a switching power module, a triphase voltage type frequency converter to constitute a DC / AC converter circuit, a gate signal isolating driver circuit to generate frequency variable AC voltage driving a triphase squirrel cage motor; a signal A / D detection interface circuit module including the feedback inputs of triphase current signal, DC voltage signal, frequency converter temperature signal, pedal accelerator signal, etc.; the DSP to read and judge the I / O signal from the driver controller for corresponding treatment and operation and to read the feedback signal for vector control or direct torsion control; and a communication module for real-time control via serial port or CAN bus. The present invention has the features of small size, light weight, simple and compact structure, high efficiency, etc.

Description

technical field [0001] The invention belongs to a special AC motor frequency conversion control technology, specifically a DSP (digital signal processor)-based embedded electric vehicle frequency conversion control method and device. Background technique [0002] With the development of high-energy battery technology, modern power electronics technology, sensor technology, microcomputer processing technology, motor control technology and modern control theory, traditional vehicles that use gasoline and diesel as energy sources will gradually be replaced by electric vehicles. Therefore, it has become inevitable to study electric vehicle drive systems with high efficiency, fast response, wide range of speed regulation, and safety and reliability. The motor drive system of electric vehicles generally consists of four main parts, namely controller, power converter, motor and sensor. All requirements on the drive system are concentrated on the control of ...

AI Technical Summary

Problems solved by technology

The DC drive system uses a DC motor as the motor, which has the characteristics of simple control and good dynamic performance and is still widely used. However, due to the existence of the DC motor commutator, the performance of the system is greatly reduced and the maximum speed of the motor is limited. And it brings a lot of problems to the maintenance of the drive system

Compared with DC motors, AC motors have the advantages of small size, high power, high efficiency, simple structure, and easy maintenance. There are obvious limitations in speed regulation methods such as resistance speed regulation, cascade speed regulation, pole-changing speed regulation, etc.

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