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Method and apparatus for PWM drive

  • US 7,358,696 B2
  • Filed: 08/15/2006
  • Issued: 04/15/2008
  • Est. Priority Date: 09/02/2005
  • Status: Expired due to Fees
First Claim
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1. A method for driving a PWM motor drive, wherein a load is connected to output terminals of first and second output stage circuits, respectively, said output stage circuits driven by first and second PWM signals, respectively, each having a high level and a low level, from a PWM generating section, the method comprising:

  • detecting a signal level of a first PWM signal;

    determining whether one of first and second PWM signals is at low level or high level after the other of the first and second PWM signals is switched between a low level and a high level;

    powering the load only when the first PWM signal and the second PWM signal are at different levels from each other;

    providing dead time when two switching elements in series are both turned off, said switching elements constituting first and second output stage circuits, and thus operating the first and second output stage circuits; and

    driving the load such that the first and second output stage circuits do not have dead time simultaneously.

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