Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2007-05-28
2009-06-02
Vu, David Hung (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S307000, C315S360000
Reexamination Certificate
active
07541750
ABSTRACT:
Disclosed is a DC to DC converter, which comprises: a transforming circuit, for transforming an input voltage to an output voltage; a comparator, for comparing a reference voltage and a feedback voltage proportional to the output voltage to generate a comparing signal; a control circuit, coupled to the transforming circuit and the comparator, for controlling the transforming circuit according to the comparing signal; and a time-counting device, coupled to the control circuit, for counting the time of a specific voltage level of the comparing signal; wherein the time-counting device informs the control circuit that a load open situation occurs if the specific voltage level of the comparing signal lasts a predetermined time, then the control circuit turns off the transforming circuit.
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patent: 6515434 (2003-02-01), Biebl
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patent: 2007/0001624 (2007-01-01), Blondia
Shen Yi-Lun
Wei Da-Chun
Hsu Winston
Le Tung X
Leadtrend Technology Corp.
Vu David Hung
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