Three-phase MOS transistor driving power supply used for electric vehicle AC motor controller

Abstract

The present invention provides a three-phase MOS transistor driving power supply used for an electric vehicle AC motor controller. The three-phase MOS transistor driving power supply comprises a flyback power supply control circuit, a transformer, diodes, filtering capacitors and load resistors. The flyback power supply control circuit is connected with a primary winding of the transformer, and the transformer has four output secondary windings, wherein three output secondary windings respectively form the power supplies of three upper-bridge driving power supplies via the diodes, the filtering capacitors and the load resistors, and the fourth output secondary winding forms the power supplies that are not common ground but share a coil of the transformer via three rectifying diodes. Compared with a scheme that the upper-bridge driving power supplies are isolated, and the lower-bridge driving power supplies are not isolated, the circulation of a DC-upper power part and a control part caused by the stray inductance can be suppressed, and compared with a method that six power supplies are totally and electrically isolated, two transformer windings can be reduced, the size of the transformer, the system cost and the fault rate are reduced, but the effects that the six driving power supplies are all not common ground, and the circulation is suppressed still can be realized.

Description

technical field [0001] The invention belongs to the technical field of driving power supply, and in particular relates to a three-phase MOS tube driving power supply for an AC motor controller of an electric vehicle. Background technique [0002] In the traditional three-phase MOS tube drive power supply used for electric vehicle AC motor controllers, one way is to use 6 completely isolated drive power supplies to drive the upper and lower tubes of the 3-phase bridge arm respectively. This circuit is complex and expensive , Another way is to use 4 completely isolated driving power supplies, 3 of which are used as the driving power of the 3 upper bridge arms, and the 4th is used as the common power supply for the three lower bridge arms. The disadvantage of this method is that it is easy to A circulating current is generated and the circuit stability is poor. Contents of the invention [0003] In view of this, the present invention aims to propose a three-phase MOS tube dr...

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Problems solved by technology

[0002] In the traditional three-phase MOS tube drive power supply used for electric vehicle AC motor controllers, one way is to use 6 completely isolated drive power supplies to drive the upper and lower tubes of the 3-phase bridge arm respectively. This circuit is complex and expensive , Another way is to use 4 completely isolated driving power supplies, 3 of which are used as the driving power of the 3 upper bridge arms, and the 4th is used as the common power supply for the three lower bridge arms. The disadvantage of this method is that it is easy to Circulating current is generated, and the circuit stability is poor

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