Patent ID: 7235933

Claim:
A reversible dimmer device of gas discharge lamp making use of at least one power switch to control actions of at least one gas discharge lamp, said reversible dimmer device comprising: a rectifier connected to said power switch to rectify a power signal input from said power switch; a power factor correction circuit connected to said rectifier to perform power factor correction and boost to said power signal; a variable frequency resonance drive circuit for producing an AC signal with a certain frequency according to said power signal to drive said gas discharge lamp; a detection circuit connected to said rectifier to detect the state of said power switch; a logic control circuit connected to said detection circuit to output a control command according to the times and timing of off-on switching of said power switch in a short period; a frequency modulation control circuit for adjusting a power parameter according to said control command so that said variable frequency resonance drive circuit can vary a drive frequency of said power signal based on said power parameter so as to adjust the luminous mode of said gas discharge lamp; and a charging/discharging controller connected to said logic control circuit, said charging/discharging controller providing a sufficient power for said variable frequency resonance drive circuit from a power storage device during switching of said power switch.