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Distributed power supply for high frequency PWM motor controller with IGBT switching transistors

  • US 5,754,732 A
  • Filed: 06/07/1995
  • Issued: 05/19/1998
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Fees
First Claim
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1. A power supply for a brushless motor controller for a motor having at least one winding, said controller being of the type including an digital electronic section to determine the amplitude, phase and frequency of the motor excitation current, a high frequency PWM electronic analog section for providing one or more pulse trains with pulse widths corresponding to sinusoidal current excitation for said motor, power transistors for controlling energization of said at least one winding in on/off fashion, and a separate gate drive responsive to one of said pulse trains for each of said power transistors to control the conductive state, wherein the gate drives and power transistors are isolated from said digital and analog electronic sections by pulse transformers, the improvement comprising:

  • a main power supply connected to supply current to said power transistors for energizing said at least one motor winding according to the pulse widths determined by said PWM electronic analog section;

    a separate floating power supply for each of said gate drives, said separate floating power supplies being coupled to the power source through a first transformer;

    a power supply for said PWM analog components coupled to the source via a second transformer separate from said first transformer;

    wherein said isolation between said analog components and said gate drive components is maintained in the respective power supplies.

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