Abstract: A power supply circuit for providing power and detecting a plurality of loads' input voltages on a motherboard includes a pulse width modulation (PWM) controller, a voltage output circuit and a voltage feedback circuit electrically connected to the PWM controller and the plurality of loads. The PWM controller outputs PWM control signals. The voltage output circuit receives the PWM control signals and outputs working voltage to the plurality of loads according to the received PWM control signals. The voltage feedback circuit detects the plurality of loads' input voltages and outputs feedback signals to the PWM controller according to the detected input voltages. The PWM controller adjusts its PWM control signal outputs, according to the received feedback signals, and adjusting working voltages to the plurality of loads.

Abstract: A power source switching circuit includes a main source input terminal, an auxiliary source input terminal, a control circuit, a first switch, a second switch, and an output terminal. The control circuit is connected to the main source input terminal and the auxiliary source input terminal. The first switch is connected to the main source input terminal and the control circuit. The second switch is connected to the auxiliary source input terminal and the control circuit. The output terminal is connected to the first switch and the second switch. When the main source input terminal is at high level, the auxiliary source input terminal remains high level, the first switch is turned on, and the second switch is turned off by the control circuit.

Abstract: A pulse modulation method for adjusting pulse signals according to a working voltage of a load, the method includes the following steps. The working voltage of the load is detected by a feedback terminal of a PWM controller. Whether the load is a light load or a heavy load is determined, if the load is a light load, a pulse skipping mode is entered; the voltage output to the load is detected by the feedback terminal. Whether the voltage output to the load is normal is determined, if the voltage output to the load is low, the pulse skipping mode is stayed for a number of clock cycles; the voltage output to the load is detected to determine whether the voltage is normal. If the voltage output to the load is still low, the pulse skipping mode is jumped out and a normal working mode is entered.

Abstract: A transient voltage compensation apparatus and a power supply using the same are provided. The power supply mainly uses a compensation circuit coupled between an input terminal and an output terminal of a power converter. When a load of the power supply is switched in a very short time, a power coupled to the compensation circuit is retrieved to compensate the output of the power supply, such that the output voltage is kept steady, and the transient response of the power supply is increased.

Abstract: A power supply circuit for providing power and detecting a plurality of loads' input voltages on a motherboard includes a pulse width modulation (PWM) controller, a voltage output circuit and a voltage feedback circuit electrically connected to the PWM controller and the plurality of loads. The PWM controller outputs PWM control signals. The voltage output circuit receives the PWM control signals and outputs working voltage to the plurality of loads according to the received PWM control signals. The voltage feedback circuit detects the plurality of loads' input voltages and outputs feedback signals to the PWM controller according to the detected input voltages. The PWM controller adjusts its PWM control signal outputs, according to the received feedback signals, and adjusting working voltages to the plurality of loads.

Abstract: A PWM control system includes a multi-phase PWM controller and at least one single-phase PWM controller. The multi-phase PWM controller is capable of generating a multi-phase PWM signal. The at least one single-phase PWM controller is capable of generating a single-phase PWM signal. A phase difference between the single-phase PWM signal and the multi-phase signal is greater than 0 degree and less than 180 degree.

Abstract: A PWM control system includes a multi-phase PWM controller and at least one single-phase PWM controller. The multi-phase PWM controller is capable of generating a multi-phase PWM signal. The at least one single-phase PWM controller is capable of generating a single-phase PWM signal. A phase difference between the single-phase PWM signal and the multi-phase signal is greater than 0 degree and less than 180 degree.

Abstract: A power source switching circuit includes a main source input terminal, an auxiliary source input terminal, a control circuit, a first switch, a second switch, and an output terminal. The control circuit is connected to the main source input terminal and the auxiliary source input terminal. The first switch is connected to the main source input terminal and the control circuit. The second switch is connected to the auxiliary source input terminal and the control circuit. The output terminal is connected to the first switch and the second switch. When the main source input terminal is at high level, the auxiliary source input terminal remains high level, the first switch is turned on, and the second switch is turned off by the control circuit.

Abstract: The present invention provides an image processing method for a display device. The method includes: calculating an average brightness of an image; adjusting the average brightness to generate an adjusted average brightness; utilizing Brightness Preserving Bi-Histogram Equalization (BBHE) and the adjusted average brightness to process the image; and displaying the image.

Abstract: A transient voltage compensation apparatus and a power supply using the same are provided. The power supply mainly uses a compensation circuit coupled between an input terminal and an output terminal of a power converter. When a load of the power supply is switched in a very short time, a power coupled to the compensation circuit is retrieved to compensate the output of the power supply, such that the output voltage is kept steady, and the transient response of the power supply is increased.

Abstract: A transient voltage compensation apparatus and a power supply using the same are provided. The power supply mainly uses an energy transferring circuit coupled between an input terminal and an output terminal of a power converter. When a load of the power supply is switched in a very short time, a power coupled to the energy transferring circuit is retrieved to compensate the output of the power supply, such that the output voltage is kept steady, and the transient response of the power supply is increased.

Abstract: A boost converter includes a first boost conversion unit and a second boost conversion unit. Coils of the first boost conversion unit and the second boost conversion unit are coupled with each other. Due to coupling of the coils, the second boost conversion unit releases energy while the first boost conversion unit stores energy in a period of time. Furthermore, due to coupling of the coils, the first boost conversion unit releases energy while the second boost conversion unit stores energy in another period of time. The two boost conversion units operate alternately, thereby adjusting switching loss and averaging output power of components. Furthermore, as switching frequency increases, the coil inductance, as well as the capacitance required in the two boost conversion units can be reduced correspondingly, thus substantially enhancing responses of the two boost conversion units as a whole.

Abstract: The invention relates to a buck converter including a first high-side switch circuit having an input terminal electrically connected to a first power input terminal, a control terminal electrically connected to a first control signal source, and an output terminal; a second high-side switch circuit having an input terminal electrically connected to a second power input terminal, a control terminal electrically connected to a second control signal source, and an output terminal electrically connected to the output terminal of the first high-side switch; a lower-side switch circuit having a first terminal electrically connected to the output terminal of the first high-side switch and a second terminal electrically connected to a reference power terminal; and a filter electrically connected to the output terminal of the first high-side switch and a power output terminal, wherein the first and second high-side switch circuits will not turn on at the same time.

Abstract: A photoelectric conversion structure includes a light energy plate, a thermoelectric cooling element and a control circuit. The light energy plate is suitable to receive light energy and convert the light energy to electrical energy. The thermoelectric cooling element has a hot side and a cold side. The hot side faces the light energy plate. The control circuit is electrically connected to the light energy plate and the thermoelectric cooling element. The control circuit is suitable to provide the electrical energy for the thermoelectric cooling element.

Abstract: A transient voltage compensation apparatus and a power supply using the same are provided. The power supply mainly uses an energy transferring circuit coupled between an input terminal and an output terminal of a power converter. When a load of the power supply is switched in a very short time, a power coupled to the energy transferring circuit is retrieved to compensate the output of the power supply, such that the output voltage is kept steady, and the transient response of the power supply is increased.

Abstract: A level shifter includes a reference voltage level and a voltage dividing circuit. The voltage dividing circuit is connected to the reference voltage level, a first voltage level, and a second voltage level. The second voltage level is between the reference voltage level and the first voltage level.

Abstract: A voltage regulator circuit with over-current protection, which includes a linear regulator, a voltage controller, and an over-current protection circuit. The linear regulator includes a converter and a driver. The converter is connected to a voltage input terminal and a voltage output terminal. An output terminal of the driver is connected to the converter for controlling the operation of the converter. The voltage controller is connected to the voltage output terminal, the output terminal and a first input terminal of the driver, respectively, for providing a feedback voltage. The over-current protection circuit is connected to the output terminal of the driver and the linear regulator. The over-current protection circuit detects the output voltage of the driver for comparing with a comparison voltage. When the output voltage is larger than the comparison voltage, the over-current protection circuit controls the driver to turn off the converter.

Abstract: The invention relates to a buck converter including a first high-side switch circuit having an input terminal electrically connected to a first power input terminal, a control terminal electrically connected to a first control signal source, and an output terminal; a second high-side switch circuit having an input terminal electrically connected to a second power input terminal, a control terminal electrically connected to a second control signal source, and an output terminal electrically connected to the output terminal of the first high-side switch; a lower-side switch circuit having a first terminal electrically connected to the output terminal of the first high-side switch and a second terminal electrically connected to a reference power terminal; and a filter electrically connected to the output terminal of the first high-side switch and a power output terminal, wherein the first and second high-side switch circuits will not turn on at the same time.

Abstract: A backlight device capable of increasing luminance efficiency includes a power transformation device having a primary end and a secondary end for transforming current received by the primary end and outputting transformed current from the secondary end. The backlight device further includes a double-wind coupling element including a first coupling element and a second coupling element coupled to terminals of the secondary end, for adjusting current between the first coupling element and the second coupling element, and a cold cathode fluorescent lamp coupled to the first coupling element and the second coupling element, for making current flowing into the cold cathode fluorescent equal to current flowing out from the cold cathode fluorescent according to adjusted current between the first coupling element and the second coupling element.

Abstract: The invention relates to an energy transfer circuit. The energy transfer circuit has a first electromagnetic induction device, electrically connected to a first power supply node; a first switch circuit for connecting the first electromagnetic induction device and a second power supply node according to a first control signal; a snubber electrically connected between the first electromagnetic induction device and the second power supply node; a second electromagnetic induction device, coupled to the first electromagnetic induction device and electrically connected to the snubber and the second power supply node; and a third electromagnetic induction device coupled to the first and second electromagnetic induction devices and electrically connected to an output port of the energy transfer circuit.