Efficient PWM controller

Details Efficient PWM controller Efficient PWM controller

2008-12-10

2011-10-25

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C327S132000

Reexamination Certificate

active

08044651

ABSTRACT:
This patent discloses an efficient PWM controller for generating a pulse signal in response to a feedback signal, capable of operating in a normal mode or a green mode, comprising: a capacitor for building a saw-tooth signal by current integration, the saw-tooth signal having a ramp-up period and a ramp-down period; a first composite current source for the ramp-up period, detachable into a first constant current source and a first variable current source; and a second composite current source for the ramp-down period, detachable into a second constant current source and a second variable current source; wherein, the first variable current source is attached to the first constant current source and the second variable current source is attached to the second constant current source respectively in the green mode.

REFERENCES:
patent: 5760623 (1998-06-01), Hastings
patent: 6519165 (2003-02-01), Koike
patent: 7106130 (2006-09-01), Gan et al.
patent: 7800352 (2010-09-01), Qiu et al.
patent: 7928715 (2011-04-01), Shibata

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