Duty ratio detecting apparatus with small return time

Details Duty ratio detecting apparatus with small return time Duty ratio detecting apparatus with small return time

2005-08-30

2005-08-30

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C327S175000, C327S425000

Reexamination Certificate

active

06937485

ABSTRACT:
In a duty ratio detecting apparatus, a duty ratio detecting circuit is constructed by first and second nodes, a load current supplying circuit for supplying first and second load currents to the first and second nodes, respectively, and a current switch connected to the first and second nodes. The current switch is operated in response to first and second complementary duty ratio signals. A duty ratio maintaining circuit is constructed by third and fourth nodes for receiving and maintaining voltages at the first and second nodes, respectively. A first switch is connected between the first and third nodes, and a second switch is connected between the second and fourth nodes. The load current supplying circuit is controlled by voltages at the third and fourth nodes.

REFERENCES:
patent: 4881041 (1989-11-01), Kawanabe et al.
patent: 5047988 (1991-09-01), Mizuta
patent: 5057702 (1991-10-01), Kitagawa et al.
patent: 6147536 (2000-11-01), Jeong
patent: 6198322 (2001-03-01), Yoshimura
patent: 6577167 (2003-06-01), Soda
patent: 6624676 (2003-09-01), Daio
patent: 2002-135105 (2002-05-01), None

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