Synchronous rectifier and control circuit thereof
AssigneesSamsung Electro-Mechanics Co., Ltd., Research & Business Foundation Sungkyunkwan University
InventorsChang Soo Kang, Chul Gyun Park, Young Jun Park, Kang Yoon Lee
Life of this patent
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Abstract
A synchronous rectifier includes: a rectifying circuit including transistors, the rectifying circuit being configured to generate rectified power by rectifying input power input to an input terminal of the rectifying circuit depending on switching operations of the transistors, and output the rectified power to an output terminal of the rectifying circuit; and a controller configured to apply a gate signal to each of the, and adjust a pulse width of the gate signal depending on a difference between the input power and the gate signal.
Claims18
A synchronous rectifier comprising:
- a rectifying circuit comprising transistors, the rectifying circuit being configured to generate rectified power by rectifying input voltage input to an input terminal of the rectifying circuit depending on switching operations of the transistors, and to output the rectified power to an output terminal of the rectifying circuit;
- and
- a controller comprising
- a pulse width modulation (PWM) signal generator configured to generate PWM signals maintained at a high level during reference times from start points in time of a positive level and a negative level of the input voltage,
- a gate signal generator configured to generate gate signals based on the PWM signals, and to apply the gate signals to the transistors, and
- a comparing device configured to compare a phase of the input voltage to phases of the gate signals to determine difference between the phase of the input voltage and the phases of the gate signals, and to generate compensation signals based on the determined differences between the phase of the input voltage and the phases of the gate signals,
- wherein the PWM signal generator is configured to adjust pulse widths of the PWM signals based on the compensation signals.
A control circuit for a synchronous rectifier, comprising:
- an input power detector configured to detect input voltage input to transistors performing a rectifying operation;
- a PWM signal generator configured to generate PWM signals maintained at a high level during reference times from start points in time of a positive level and a negative level of the input voltage detected in the input power detector;
- a gate signal generator configured to generate gate signals provided to the transistors depending on the PWM signals;
- and
- a comparing device configured to compare a phase of the input voltage to phases of the gate signals to determine differences between the phase of the input voltage and the phases of the gate signals, and to generate compensation signals based on the determined differences between the phase of the input voltage and the phases of the gate signals,
- wherein the PWM signal generator is configured to adjust pulse widths of the PWM signals based the compensation signals.
Dependencies are inferred from the claim text.