Abstract: A voltage setting value adjusting device includes a controller, a plurality of laser light sources and a voltage setting value adjusting circuit. The controller has a voltage setting value input end and a driving voltage output end. The laser light sources are coupled to the driving voltage output end, and the controller outputs a driving current to the laser light sources according to a voltage setting value. The voltage setting value adjusting circuit is coupled between the voltage setting value input end and the driving voltage output end to detect a driving voltage of the laser light sources and adjust the voltage setting value according to the driving voltage.

Abstract: A driver circuit includes a first voltage conversion unit, a second voltage conversion unit, a third voltage conversion unit, a light driver and a control circuit. The first voltage conversion unit may convert a first voltage to a second voltage. The second voltage conversion unit may convert the second voltage to a third voltage in a non-electrically isolated manner. The third voltage conversion unit may convert the second voltage to a fourth voltage in a non-electrically isolated manner. The light driver may receive the third voltage and a control signal to generate a control current according to the control signal. The control circuit may receive the fourth voltage and an image signal to generate the control signal according to the image signal.

Abstract: A voltage setting value adjusting device includes a controller, a plurality of laser light sources and a voltage setting value adjusting circuit. The controller has a voltage setting value input end and a driving voltage output end. The laser light sources are coupled to the driving voltage output end, and the controller outputs a driving current to the laser light sources according to a voltage setting value. The voltage setting value adjusting circuit is coupled between the voltage setting value input end and the driving voltage output end to detect a driving voltage of the laser light sources and adjust the voltage setting value according to the driving voltage.

Abstract: A driver circuit includes a first voltage conversion unit, a second voltage conversion unit, a third voltage conversion unit, a light driver and a control circuit. The first voltage conversion unit may convert a first voltage to a second voltage. The second voltage conversion unit may convert the second voltage to a third voltage in a non-electrically isolated manner. The third voltage conversion unit may convert the second voltage to a fourth voltage in a non-electrically isolated manner. The light driver may receive the third voltage and a control signal to generate a control current according to the control signal. The control circuit may receive the fourth voltage and an image signal to generate the control signal according to the image signal.

Abstract: A driver circuit includes a first voltage converter, a light source driver, a second voltage converter and a control circuit. The first voltage converter converts a first voltage to a second voltage. The light source driver is coupled to the first voltage converter, converts the second voltage to a third voltage and outputs the third voltage to a light source for providing light. The second voltage converter is coupled to the first voltage converter, converts the second voltage to a fourth voltage and outputs the fourth voltage. The control circuit is coupled to the second voltage converter to receive the fourth voltage and outputs a first control signal to control the light source driver for controlling the light source. The first voltage is lower than the second voltage, the second voltage is higher than the third voltage, and the second voltage is higher than the fourth voltage.

Abstract: An electronic device includes a first light module, a second light module, a primary driver, and a first secondary driver. The first light module is used to emit a first light, and the second light module is used to emit a second light. The primary driver has a first control terminal for turning on the first light module during a first duration, and a second control terminal for turning on the second light module during a second duration. The first secondary driver is used to turn on the first light module during the second duration.

Abstract: An electronic device includes a first light module, a second light module, a primary driver, and a first secondary driver. The first light module is used to emit a first light, and the second light module is used to emit a second light. The primary driver has a first control terminal for turning on the first light module during a first duration, and a second control terminal for turning on the second light module during a second duration. The first secondary driver is used to turn on the first light module during the second duration.

Abstract: Power factor correction circuits are provided, in which a boosting converter comprises a switching element and an inductor, to convert a rectified voltage to a DC output voltage. An adjustment unit comprises a thermister with positive temperature coefficient, to generate an adjustment signal according to a present temperature and the DC output voltage. A control unit controls a duty cycle of the switching element according to the adjustment signal, thereby adjusting the voltage difference between the rectified voltage and the DC output voltage.

Abstract: A D-class audio power amplifier including a microprocessor, a power amplifier, and a low pass filter is provided. The microprocessor is used to sample an input audio signal and output a pulse width modulation (PWM) clock signal. The power amplifier is used to amplify the power of the PWM clock signal and output a power-amplified signal. The low-pass filter is used to filter the high-frequency signal portion off the power-amplified signal and output an output audio signal. The method includes sampling the input audio signal to obtain a number of digital sampling values; obtaining corresponding duty cycles according to the digital sampling values and a reference voltage level and generating the PWM clock signal accordingly; power-amplifying the PWM clock signal to obtain the power-amplified signal; and filtering the high-frequency signal portion off the power-amplified signal to obtain the output audio signal.

Abstract: An electronic device having an illumination circuit. The illumination circuit utilizes an AC current of an AC driving device to drive an illumination device such as an electroluminescent lamp and the remaining life of the AC driving device indicated by the brightness of illumination device.

Abstract: A D-class audio power amplifier including a microprocessor, a power amplifier, and a low pass filter is provided. The microprocessor is used to sample an input audio signal and output a pulse width modulation (PWM) clock signal. The power amplifier is used to amplify the power of the PWM clock signal and output a power-amplified signal. The low-pass filter is used to filter the high-frequency signal portion off the power-amplified signal and output an output audio signal. The method includes sampling the input audio signal to obtain a number of digital sampling values; obtaining corresponding duty cycles according to the digital sampling values and a reference voltage level and generating the PWM clock signal accordingly; power-amplifying the PWM clock signal to obtain the power-amplified signal; and filtering the high-frequency signal portion off the power-amplified signal to obtain the output audio signal.

Abstract: An electronic device having an illumination circuit. The illumination circuit utilizes an AC current of an AC driving device to drive an illumination device such as an electroluminescent lamp and the remaining life of the AC driving device indicated by the brightness of illumination device.

Abstract: The present invention provides a power supply apparatus for outputting an output voltage according to a first signal from outside, the power supply apparatuses comprises a rectifier, a power transformer, a power control circuit, and a switching device. The rectifier is provided for supplying a DC voltage source. The power transformer receives the DC voltage source, then outputs the output voltage and a second signal. The power control circuit is provided for controlling the output voltage of the power transformer according to the second signal, then the switching device outputs the second signal to the power control circuit according to the first signal.

Abstract: The present invention provides a power supply apparatus for outputting an output voltage according to a first signal from outside, the power supply apparatuses comprises a rectifier, a power transformer, a power control circuit, and a switching device. The rectifier is provided for supplying a DC voltage source. The power transformer receives the DC voltage source, then outputs the output voltage and a second signal. The power control circuit is provided for controlling the output voltage of the power transformer according to the second signal, then the switching device outputs the second signal to the power control circuit according to the first signal.