Voltage mode pulse width modulation controller

Details Voltage mode pulse width modulation controller Voltage mode pulse width modulation controller

1993-04-29

1995-05-09

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

G05F 144

Patent

active

054143420

ABSTRACT:
A pulse width modulator voltage feedforward circuit which includes a gating circuit for providing a control signal to a charge circuit which charges an integration circuit with a current proportional to an input voltage. The integration circuit provides an output ramp signal waveform having a slope proportional to the input voltage value. The gating circuit also provide a control signal to a discharge circuit, to thus alternately charge and discharge the integration circuit. The gating circuit insures that a minimum deadtime for a transformer reset will occur regardless of input voltage variations by preventing a fixed frequency signal provided by an oscillator from beginning a new ramp waveform signal period until the integration circuit is discharged to a minimum reference voltage level.

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