Front-stage voltage-adjustment inverter

Details Front-stage voltage-adjustment inverter Front-stage voltage-adjustment inverter

2007-12-31

2010-11-23

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S299000, C315S308000

Reexamination Certificate

active

07839100

ABSTRACT:
The present invention discloses a front-stage voltage-adjustment inverter, which comprises: a front-stage voltage-adjustment unit, a duty cycle modulation unit, a half-bridge driving unit and a transformer unit. The front-stage voltage-adjustment unit receives an input power, a dimming signal and a feedback signal. The front-stage voltage-adjustment unit varies the voltage of the input power according to the dimming signal and performs a feedback adjustment according to the feedback signal. In the present invention, the cycle signal generated by the duty cycle modulation unit does not vary with the dimming signal and feedback signal. Thus, the half-bridge driving unit can work in a zero-voltage switching state constantly and drive the transformer unit to output a driving power. Thereby, the present invention can decrease the switching loss and increase the service lives of loads and electronic elements.

REFERENCES:
patent: 5751115 (1998-05-01), Jayaraman et al.
patent: 5914572 (1999-06-01), Qian et al.
patent: 6995989 (2006-02-01), Wang
patent: 2009/0045755 (2009-02-01), Cheng et al.
patent: 518633 (2003-01-01), None
patent: I242177 (2005-10-01), None
patent: I273764 (2007-02-01), None

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