PRIMARY SIDE REGULATION POWER SUPPLY DEVICE
First Claim
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1. A primary-side regulation (PSR) power supply device comprising:
- a power switch;
an auxiliary wiring from which an auxiliary voltage that depends on an output voltage is generated during a turn-off period of the power switch;
a clamping circuit configured to clamp a voltage corresponding to the auxiliary voltage to a predetermined voltage;
a voltage follower configured to decrease a sense voltage according to a decrease of the auxiliary voltage; and
a switch control circuit configured to control a switching operation of the power switch by using the sense voltage.
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Abstract
A primary-side regulation (PSR) power supply device according to the invention includes: a power switch; an auxiliary wiring from which an auxiliary voltage that depends on an output voltage is generated during a turn-off period of the power switch and being provided in a primary side; a clamping circuit clamping a voltage corresponding to the auxiliary voltage to a predetermined voltage; a voltage follower decreasing the sense voltage according to a decrease of the auxiliary voltage; and a switch control circuit controlling a switching operation of the power switch by using the sense voltage.
12 Citations
16 Claims
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1. A primary-side regulation (PSR) power supply device comprising:
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a power switch; an auxiliary wiring from which an auxiliary voltage that depends on an output voltage is generated during a turn-off period of the power switch; a clamping circuit configured to clamp a voltage corresponding to the auxiliary voltage to a predetermined voltage; a voltage follower configured to decrease a sense voltage according to a decrease of the auxiliary voltage; and a switch control circuit configured to control a switching operation of the power switch by using the sense voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification