Normal mode and green mode pulse width modulation controller

Details Normal mode and green mode pulse width modulation controller Normal mode and green mode pulse width modulation controller

2006-11-01

2008-10-14

Luu, An T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S175000, C327S026000, C327S037000, C323S282000, C323S284000

Reexamination Certificate

active

07436233

ABSTRACT:
A PWM controller that effectively transitions between normal mode and green power mode is disclosed. A driver provides a normal drive signal during normal operation. A pulse width detector detects the pulse width of the PWM signal and if the pulse width drops below a threshold the normal mode drive signal will be turned off and a pulse ON time measurer will begin storing the pulse ON time. When the total ON time reaches a total ON time threshold or the output voltage drops below a voltage limit, a green mode drive signal will be output to the power converter. During green mode the driver will continue sending the green mode drive signal at intervals until a heavy load condition when the green mode drive signal will be shut off and the driver will resume sending the normal mode drive signal.

REFERENCES:
patent: 6713995 (2004-03-01), Chen
patent: 6798180 (2004-09-01), Sase et al.
patent: 7109692 (2006-09-01), Wu et al.

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