Device and Method for Controlling Power Supply with Delay Behavior in a Power Circuit
AssigneesSanken Electric Co., Ltd., Sanken Electric Korea Co.,Ltd.
InventorsEun Suk LEE, Masaaki SHIMADA, Mi Yong KIM, Tetsuya TABATA, Hiroaki NAKAMURA
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Abstract
A device and method for controlling a power supply. The method includes: a voltage signal in a primary winding is delayed, and the delayed voltage signal is sampled and held after a time when a rectifying diode stops conducting a current, then the sampled and held signal is used as a feedback signal of the power supply. Therefore, only one sampling and holding circuit is needed, the area of the circuit can be reduced and the cost of the integrated circuit can be decreased, meanwhile regulation characteristics are not deteriorated.
Claims20
A device for controlling a power supply;
- the power supply comprising a switching element, a transformer with a primary winding and a secondary winding, and a rectifying diode connected to the secondary winding;
- wherein the device comprises:
- a smooth filtering circuit configured to filter at least one of a ringing voltage and a surging voltage of a voltage signal in the primary winding and pass a voltage greater than a reference voltage and to generate a filtered voltage signal;
- a snubber circuit connected to the primary winding, wherein the snubber circuit is configured to filter at least one of the ringing voltage and the surging voltage of the voltage signal in the primary winding;
- a delay circuit configured to delay the filtered voltage signal from the smooth filtering circuit and generate a delayed voltage signal;
- and
- a sampling and holding circuit configured to sample and hold the delayed voltage signal after a time when the rectifying diode stops conducting a current, and to output a feedback signal used for controlling the switching element.
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A method for controlling a power supply;
- the power supply comprising a switching element, a transformer with a primary winding and a secondary winding, and a rectifying diode connected to the secondary winding;
- wherein the method comprises:
- filtering, using a smooth filtering circuit and a snubber circuit, at least one of a ringing voltage and a surging voltage of a voltage signal in the primary winding and passing a voltage greater than a reference voltage to generate a filtered voltage signal;
- delaying the filtered voltage signal and generating a delayed voltage signal;
- and
- sampling and holding the delayed voltage signal after a time when the rectifying diode stops conducting a current, and to output a feedback signal used for controlling the switching element.
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Dependencies are inferred from the claim text.