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
An example power converter 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. Feedback circuitry is coupled to receive a feedback signal, which is representative of an output of a power converter during a feedback portion of an off time of the power switch. The feedback circuitry is coupled to respond to the feedback signal to control the clock signal generator to regulate a duty cycle of the feedback portion of the off time of the power switch as a proportion of a total power switch switching cycle period.
Claims15
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 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 duty cycle of the feedback portion of the off time of the power switch as a proportion of a total power switch switching cycle period,
- wherein the feedback circuit further comprises a feedback capacitor coupled to be charged during the feedback portion of the off time of the power switch and coupled to be discharged for a remaining portion of the total power switch switching cycle period and comprises first and second current sources coupled to charge and discharge the feedback capacitor;
- and
- a voltage stabilization circuit coupled to the feedback circuit to stabilize first and second voltages across first and second current sources, respectively.
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 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 duty cycle of the feedback portion of the off time of the power switch as a proportion of a total power switch switching cycle period;
- and
- wherein the feedback circuit further comprises a feedback capacitor coupled to be charged during the feedback portion of the off time of the power switch and coupled to be discharged for a remaining portion of the total power switch switching cycle period.
Dependencies are inferred from the claim text.