Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2006-09-05
2006-09-05
Vo, Tuyet Thi (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S307000, C315S247000, C315S276000
Reexamination Certificate
active
07102300
ABSTRACT:
A ballast device having active ballasting circuit and method thereof, which are used for controlling a HID lamp's power supply real-timely and steadily, comprising: a power supply unit in said ballast device for generating an outer working voltage, which has a DC-DC transformer to step down the output voltage; a micro control unit, which fetches the parameters of the ballast device other than itself or the HID lamp's various working status and generates a predefined load current by these parameters; a PWM control unit, which has a PID control module, the PID control module calculates said predefined load current and the HID lamp's practical load current, and makes said DC-DC transformer change it's output voltage by the calculate results. The present invention has a simple structure and can change the load current real-timely and steadily.
REFERENCES:
patent: 6642674 (2003-11-01), Liao et al.
patent: 6812916 (2004-11-01), Hwang
patent: 2003/0076053 (2003-04-01), Kambara et al.
patent: 2006/0055341 (2006-03-01), Watanabe et al.
Chieh Pi-Yao
Wang Chang-Feng
Asia Optical Co. Inc.
Troxell Law Office PLLC
Vo Tuyet Thi
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