Inverter capable of switching working frequency

Details Inverter capable of switching working frequency Inverter capable of switching working frequency

2007-07-17

2007-07-17

Chen, Shih-Chao (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C363S015000

Reexamination Certificate

active

11279905

ABSTRACT:
An inverter capable of switching working frequency for activating a lamp. The inverter comprises a voltage converter, a feedback circuit, a control unit and a frequency switcher. The voltage converter transforms a DC input voltage into a second AC voltage according to a control signal. The lamp is activated and generates a feedback current. The circuit converts the feedback current into the feedback voltage. The control unit for generating a first working frequency includes a resonance circuit having a specific resistance and capacitance, and a control device for generating the control signal according to a reference voltage, the first working frequency and the feedback voltage in a predetermined period. Then, the switcher changes the specific resistance and/or capacitance for enabling the control unit to generate a second working frequency. The control device outputs the control signal according to the second working frequency and the feedback voltage.

REFERENCES:
patent: 5883473 (1999-03-01), Li et al.
patent: 5969483 (1999-10-01), Li et al.
patent: 6075326 (2000-06-01), Nostwick
patent: 6515436 (2003-02-01), Kobayashi et al.
patent: 2003/0155349 (2003-08-01), Matsuo et al.

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