Abstract: A power supply system and operating method thereof are provided. The power supply system includes a power generation circuit and a discharge circuit. The power generation circuit is configured to provide an output voltage at an output end when a power is started, and stop providing the output voltage when the power is off. The discharge circuit includes a capacitor, a comparison circuit, and a switch circuit. The comparison circuit is configured to compare a voltage at a detection end and the output voltage at the output end to generate a comparison result. The switch circuit is configured to discharge the output end according to the comparison result when the power is off. The power supply system and an operating method thereof provided by the disclosure can reduce loss when the power is off, so as to improve the operation quality of the circuit.

Abstract: A driving circuit for driving a light source and a projection device are provided. The driving circuit includes a power converter, a detection circuit, and a control circuit. The power converter provides a driving power to the light source. The detection circuit provides a feedback signal according to a current value of the light source. The control circuit receives an operation command and the feedback signal. The control circuit determines whether the driving circuit enters a light-load state according to at least one of the operation command and the feedback signal. When the driving circuit is determined to enter the light-load state, the control circuit controls the power converter to decrease a current value of the driving power and controls the power converter to increase a switching frequency of the driving power. The driving circuit and the projection device may prevent the light source from flickering under the light-load state.

Abstract: A hot air flow direction control mechanism of a base board baking machine includes a stand, a controller, a housing, a hot air device, an air suction unit, and a top cover. Thus, the hot air device blows the hot air into the housing, and the air suction unit sucks the hot air so that the hot air is circulated evenly in the housing and around the periphery of the housing.

Abstract: Abase board baking machine includes a stand, a controller, a housing, a heating mechanism, and a top cover. The heating mechanism includes a heating plate, an infrared heater, and a heated air device. The heating plate in placed in the housing. The infrared heater is mounted on a bottom of the top cover and corresponds to the heating plate. The heated air device is mounted on a side of the housing. Thus, the interior of the housing contains three different heat sources to heat a base board evenly and completely.

Abstract: A hot air flow direction control mechanism of a base board baking machine includes a housing, a heated air device and a plurality of air suction units. The heated air device blows heated air, and the air suction units suck and drain the heated air. Thus, the heated air device and the air suction units form an air convection of the heated air, so that the heated air is full of the housing, and the base board is baked evenly and completely.

Abstract: A power supply module is formed as a package body suitable to be assembled in a light emitting diode illumination apparatus. The power supply module includes a light emitting diode driver, a feedback control unit, a current converting unit, and a package material. The light emitting diode driver, the feedback control unit, and the current converting unit are packaged integrally by the package material. The current converting unit is suitable for supplying power to the light emitting diode driver and the feedback control unit. The feedback control unit is suitable to receive a feedback signal from a light source module disposed outside of the package body and provide an adjusting signal to the light emitting diode driver, so as to make the light emitting diode driver to adjust the magnitude of a control current and provide the control current to the light source module.