Delta Electronics, Inc.

Chao-Shun Yang

Cheng-Hsun Chang

Chien-Jen Chen

Yao-Hsien Huang

The present disclosure provides a conversion circuit including a power supply module, positive and negative input terminals, positive and negative output terminals, a switch, an inductor, input and output capacitors, and a controller. The power supply module converts an AC power for providing three potentials on three power supply terminals respectively. The potential on the first power supply terminal is higher than the potential on the second power supply terminal, which is higher than the potential on the third power supply terminal. The positive and negative input terminals are electrically connected to the first and third power supply terminals respectively, and a voltage therebetween is an input voltage. The negative output terminal is electrically connected to the third power supply terminal. The controller is electrically connected to the positive input terminal, the second power supply terminal and the switch. A voltage across the controller is lower than the input voltage.

Conversion circuit

A projection apparatus and a method for adjusting a driving voltage of the projection apparatus are provided. The projection apparatus comprises an illuminant module, an output voltage control module, an illuminant driver module, and an illuminant driver management module. The output voltage control module is configured to output a driving voltage. The illuminant driver module is configured to output an illuminant voltage to the illuminant module after receiving the driving voltage. The illuminant driver management module is configured to receive the illuminant voltage and to detect a variation in the illuminant voltage. Then, the illuminant driver management module outputs a control signal to the output voltage control module according to the variation of the illuminant voltage. Finally, the output voltage control module adjusts the driving voltage according to the control signal.

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Taoyuan Hsien, Taiwan

Chao-Shun Yang