Fsp Technology Inc.

Ken-Chuan Hsu

Shih An Liang

Kuo-Hei Lee

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.

Front-stage voltage-adjustment inverter

The present invention includes a PWM unit, a switch unit, a resonance unit, a transformer, a feedback unit and a frequency control unit, wherein the switch unit obtains a DC power from a power source, the PWM unit produces a working cycle signal to drive the switch unit to convert the DC power into a pulse power and the resonance unit converts the pulse power into a driving power for providing to the transformer to convert thereof into an output power, characterized in that when the resonance unit is under a starting frequency and a working frequency higher than the starting voltage, a starting voltage gain and a working voltage gain respectively corresponding thereto are produced, wherein the starting voltage gain is larger than the working voltage gain, so that the larger starting voltage gain can produce the output power with higher voltage to smoothly initiate the lamp tube set.

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Taoyuan Hsien, Taiwan

Ken-Chuan Hsu