Method and apparatus for regulating a diode conduction duty cycle
AssigneePower Integrations, Inc.
InventorsChan Woong Park, Leif O. Lund
Life of this patent
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Abstract
A power converter control method and apparatus is disclosed. An example control circuit includes a clock signal generator coupled to generate a clock signal to control switching of a power switch to be coupled to the control circuit. A feedback circuit is coupled to receive a feedback signal which is representative of an output of a power converter during a duration of a feedback portion of an off time of the power switch. The feedback circuit is coupled to respond to the feedback signal to control the clock signal generator to regulate a ratio of the duration of the feedback portion of the off time of the power switch divided by a duration of a total power switch switching cycle period.
Claims30
A control circuit for use in a power converter, comprising:
- a clock signal generator coupled to generate a clock signal to control switching of a power switch to be coupled to the control circuit;
- and
- a feedback circuit coupled to receive a feedback signal which is representative of an output of a power converter during a duration of a feedback portion of an off time of the power switch, the feedback circuit coupled to respond to the feedback signal to control the clock signal generator to regulate a ratio of the duration of the feedback portion of the off time of the power switch divided by a duration of a total power switch switching cycle period.
A control circuit for use in a power converter, comprising:
- a clock signal generator coupled to generate a clock signal to control switching of a power switch to be coupled to the control circuit;
- a feedback circuit coupled to receive a feedback signal which is representative of an output of a power converter during a duration of a feedback portion of an off time of the power switch, the feedback circuit coupled to respond to the feedback signal to control the clock signal generator to regulate a ratio of the duration of the feedback portion of the off time of the power switch divided by a duration of a total power switch switching cycle period;
- and
- wherein the clock signal generator further comprises a comparator coupled to hold an oscillator from oscillating in response to the feedback circuit.
A power converter, comprising:
- an energy transfer element coupled between a power converter input and a power converter output, the power converter input including first and second input terminals;
- a power switch coupled to the energy transfer element such that a current flows between the first and second input terminals through the energy transfer element and the power switch during an on time of the power switch;
- and
- a control circuit coupled to the power switch and coupled to receive a feedback signal which is representative of an output of the power converter during a duration of a feedback portion of an off time of the power switch, wherein the control circuit is coupled to regulate a ratio of the duration of the feedback portion of the off time of the power switch divided by a duration of a total power switch switching cycle period.
A method for controlling a power converter, comprising:
- switching a power switch on and off;
- generating a feedback signal which is representative of a power converter output during a duration of a feedback portion of an off time of the power switch;
- and
- controlling switching of the power switch to regulate a ratio of the duration of the feedback portion of the off time of the power switch divided by a duration of a total power switch switching cycle period.
Dependencies are inferred from the claim text.