Power adapter with voltage-stabilized compensation

Details Power adapter with voltage-stabilized compensation Power adapter with voltage-stabilized compensation

2011-01-04

2011-01-04

Nguyen, Matthew V (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021120

Reexamination Certificate

active

07864550

ABSTRACT:
A power adapter with voltage-stabilized compensation includes a pulse frequency modulation circuit to generate a driving pulse which has a variable OFF time interval to control power transformed and output by a transformer. The power adapter also has an ancillary coil to induce a feedback signal on the secondary coil of the transformer. The pulse frequency modulation circuit includes a time interval modulation unit to receive the feedback signal and a feedback compensation unit. The time interval modulation unit sets a level voltage compared with the feedback signal to generate a sample signal to modulate the OFF time interval. The feedback compensation unit provides a compensation signal to the time interval modulation unit to change the size of the feedback signal or sample signal thereby to compensate the voltage output from the secondary side.

REFERENCES:
patent: 4763236 (1988-08-01), Usui
patent: 5138543 (1992-08-01), Harm et al.
patent: 5909363 (1999-06-01), Yoon
patent: 6396717 (2002-05-01), Yasumura
patent: 6515876 (2003-02-01), Koike et al.
patent: 2008/0130325 (2008-06-01), Ye

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