An Interleaved Parallel Buck Converter for High Speed ​​Motor Control

Abstract

The invention provides an interleaving Buck converter for the control of a high-speed motor. The interleaving Buck converter comprises three power switch tubes, three freewheel diodes, one three-way coupling inductor, a bus voltage sensor, a bus current sensor, a digital controller, a line counter electromotive force zero-crossing signal detection circuit, a three-phase bridge type converter and the high-speed motor. A direct current is chopped through the power switch tubes and the freewheel diodes, and then, is filtered by the three-way coupling inductor; and the filtered direct current is detected by the bus voltage sensor and the bus current sensor, and then, is input to the three-phase bridge type converter and the high-speed motor. The digital controller receives two paths of analog signals output by the bus voltage sensor and the bus current sensor as well as three paths of line counter electromotive force zero-crossing signals and carries out logical operation, and then outputs three paths of PWM phase shift signals for carrying out output energy tracking control of the interleaving Buck converter. The interleaving Buck converter solves the problem of power electronic transformation for the control of the high-speed motor and has an important application value for the study of control of the high-speed motor.

Description

technical field [0001] The invention relates to a power electronic conversion technology for high-speed motor control, in particular to a power electronic conversion device and a modulation method for an interleaved parallel Buck converter used in a high-power high-speed motor control system. Background technique [0002] With the demand for green and energy-saving motors, high-speed motors have become one of the research hotspots in the direction of motors because of their high speed, high power density, and small size. When the high-speed motor runs at high speed, the corresponding three-phase bridge inverter switching tube has a high operating frequency, and the freewheeling diode has a long reverse recovery time, which leads to large inverter losses and low efficiency. [0003] In order to improve the system efficiency, the DC power is firstly modulated by a high-frequency Buck converter and then sent to the three-phase bridge inverter and then connected to the motor win...

AI Technical Summary

Problems solved by technology

The literature usually designs the switching power supply from the aspects of magnetic element design, control circuit design, phase-shift control, etc., which cannot meet the inductive load requirements of high-speed motors with small armature inductance characteristics, and does not provide interleaved parallel Buck conversion for high-speed motor control systems. modulation method

[0006] Therefore, the existing interleaved parallel Buck converters cannot meet the needs of high-efficiency power electronic conversion for high-power high-speed motors running at high speeds, and cannot solve the modulation problem of interleaved parallel Buck converters used in high-speed motor control systems

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