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Pulse width modulator control circuit

  • US 5,045,800 A
  • Filed: 03/23/1990
  • Issued: 09/03/1991
  • Est. Priority Date: 03/23/1990
  • Status: Expired due to Term
First Claim
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1. A circuit which generates control signals used in pulse width modulation, the control signals including a square wave signal and a sawtooth signal, the sawtooth signal oscillating between a maximum voltage level and a minimum voltage level, the circuit comprising:

  • sawtooth signal generating means, for generating the sawtooth signal; and

    ,square wave signal generating means, coupled to the sawtooth signal generating means, for receiving the sawtooth signal, for comparing the voltage level of the sawtooth signal with a first voltage slightly above the minimum voltage level and with a second voltage slightly below the maximum voltage level, and for generating a square wave with a rising edge that occurs only when voltage of the sawtooth signal is increasing and reaches the first voltage and with a falling edge that occurs only when voltage of the sawtooth signal is increasing and reaches the second voltage.

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