Multiple Output Flyback Converter, Motor Driver and New Energy Vehicle

Abstract

An embodiment of the present invention provides a multi-output flyback converter, The multi-output flyback converter comprises an input unit, a switching unit, a control unit, a voltage feedback unitand a plurality of mutually independent transformers, wherein, each of the transformers comprises a primary side winding, a secondary side winding and a primary side feedback winding; The input unit,the primary winding of the transformer and the switching unit are connected to form a primary side loop, and the primary winding of the plurality of transformers are connected in parallel in the primary side loop; An input terminal of the voltage feedback unit is connected to an output terminal of the plurality of primary feedback windings, and a reference ground of the primary feedback windings is the same as a reference ground of the control unit; The output terminal of the control unit is connected to the control terminal of the switching unit. The embodiment of the invention can effectively improve the cross regulation rate of the output voltages of each transformer while avoiding the use of a high-cost isolation feedback circuit.

Description

technical field [0001] Embodiments of the present invention relate to the field of switching converters, and more specifically, relate to a multi-output flyback converter, a motor driver and a new energy vehicle. Background technique [0002] The power supply system in the motor driver has the characteristics of wide distribution, different types and large quantities. For example, in the motor driver of an electric vehicle, the power supply system has only one input, that is, the low-voltage battery, and there are various outputs, such as the power supply of the central controller, generally 1.3V, 3.3V and 5V, and the drive of the inverter. power supply etc. [0003] For high-power three-phase inverters, in order to effectively eliminate the ground loop noise of the three-phase lower bridge arm, it is necessary to use six isolated driving power sources to power the three-phase inverter. Therefore, if multiple independent DC converters (ie, DC / DC converters) are used to con...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the embodiments of the present invention is that the improvement measures adopted for the above-mentioned existing multi-output flyback converter to improve the cross-regulation rate all need to introduce an isolation feedback device, resulting in high cost and linearity affected by temperature. Problems that have a greater impact, provide a new multi-output flyback converter, motor driver and new energy vehicles

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