High-frequency-link driver for brushless motor of electric automobile

Abstract

The invention discloses a high-frequency-link driver for a brushless motor of an electric automobile and a 180-degree control method of a high-frequency-link driver. A high-frequency-link matrix converter is used in a driver of the electric automobile, so that the driver of the electric automobile has the capacity of a brushless direct-current motor. A high-frequency-link matrix converter decoupling thinking and circuit driving signals of a common full-bridge brushless direct-current motor 180-degree triangular conduction control mode are used together to obtain a novel modulation strategy of the high-frequency-link matrix converter with a brushless direct-current motor load, three windings of the motor can be controlled to operate together by a triangular conduction brushless motor control system, the use ratio of the windings is improved further, torque fluctuation is reduced, and the outputting power of the motor is increased. The high-frequency-link driver for the brushless motor of the electric automobile has a wide application prospect in the field of electric automobiles.

Description

technical field [0001] The invention relates to a high-frequency chain driver for a brushless motor of an electric vehicle, in particular to a high-frequency chain driver for a brushless motor of an electric vehicle with 180-degree control, and belongs to the fields of power electronic power converter modulation and brushless motor control. Background technique [0002] The main research core of electric vehicles is the electric drive system, but the electric drive system currently used mainly has the disadvantages of large size and bulkiness, low efficiency and high noise. Traditional inverter technology is difficult to solve the above problems. The high-frequency chain inverter technology uses a smaller high-frequency transformer. Therefore, the high-frequency chain inverter technology saves the bulky power frequency transformer. By increasing the operating frequency of the transformer, the volume of the transformer is greatly reduced and the power of the system is increase...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the known ordinary inverter has large volume, low efficiency, high noise, and the direct short circuit of the upper and lower switching tubes of the same bridge arm in the 180-degree conduction mode, which causes damage to the switching device, and solves the problem of high-frequency chain matrix The modulation and control method of the converter is complex, and it cannot simply and effectively solve the problem of safe commutation of bidirectional switches. A HPWM modulation strategy suitable for 180-degree controlled brushless DC motor high-frequency chain driver of electric vehicles is proposed.

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