Abstract: A scan-type display device control circuit is suitable for receiving successive frame data and driving a light-emitting diode (LED) display device accordingly. The scan-type display device control circuit includes a ping-pong buffer, a data storage controller, a line scan controller, a display buffer, and a scrambled pulse width modulation (PMW) signal generating device. The scan-type display device control circuit can utilize frame data circularly and repeatedly, so as to prevent a great mass of data from being transmitted repeatedly. Therefore, a band width for inputting data can be reduced significantly. Furthermore, the scrambled PMW signal generating device can scramble a PMW signal with a long period into a plurality of scrambled PMW signals with a short period. Therefore, the refresh rate can be efficiently enhanced without changing the band width for inputting data.

Abstract: A light-emitting diode driving circuit includes an AC/DC converting circuit for converting an AC power source into a DC power source; a switching element having an input contact connected to the AC/DC converting circuit; a control unit for outputting a control signal to the switching element at a set frequency to turn on or turn off the switching element, wherein a first resistor is disposed between a power contact thereof and the input contact of the switching element; a second resistor for enabling the control unit to detect a half-cycle voltage of the DC power source; a capacitor having a first end connected to the power contact, and a second end connected to a ground contact of the control unit; and an inductor having a first end connected to the ground contact and the second end of the capacitor, and a second end connected to a light-emitting diode.

Abstract: A fixed frequency dimming method and fixed frequency dimming circuit for a light emitting module can control light emitting brightness of the light emitting module through a hysteresis control circuit. A voltage difference between an upper limit voltage and a lower limit voltage of a hysteresis width of the hysteresis control circuit is maintained at a fixed value, and a driving current flowing through the light emitting module is changed by changing the upper limit voltage or the lower limit voltage.

Abstract: The present invention discloses a cooperation circuit, comprising: a first control module, capable of generating a first control signal and a second control signal, the pulse width of the first control signal being determined by the pulse width of the second control signal; and a second control module, coupled to the first control module to receive the first control signal and the second control signal and generate a third control signal according to the first control signal and the second control signal; wherein, according to the first control signal and the second control signal, the second control module enables the third control signal and the second control signal to exhibit the same frequency and the same duty cycle with a phase delay.

Abstract: An illuminating device and a luminance switching device thereof for controlling luminance of light emitting states of LED light source are provided.

Abstract: A single-stage isolated high power factor AC/DC converter with a leakage inductor energy recovery function includes a buck-boost circuit, for step-down or step-down a power supply; a transformer, electrically connected to the buck-boost circuit, for transforming the stepped-down or stepped-up power supply; a switch, electrically connected to the buck-boost circuit; an input capacitor, electrically connected to the buck-boost circuit; and an output circuit, for outputting the power supply transformed by the transformer. When the switch is cut off, the buck-boost circuit provides an energy recovery path to return energy stored in a leakage inductor of the transformer to the input capacitor. The energy stored in the leakage inductor of the transformer in a flyback converter or a forward converter is returned to the input capacitor through the energy recovery path. The problem caused by the leakage inductor of the transformer is solved without using any additional element.

Abstract: A powering circuit of an AC-DC converter, for converting a high AC input voltage into a low DC output voltage to provide a load voltage in a stable DC bias range, includes a rectifier, a sensing circuit, a control switching circuit, and a voltage regulating capacitor. The rectifier has a primary side coupled to an AC power supply and a secondary side for outputting a DC power supply. The sensing circuit compares the AC input voltage with a preset reference voltage, and turns on a second switch in the control switching circuit when the AC input voltage is lower than the reference voltage, thereby providing a low DC output voltage. The control switching circuit sustains the DC output voltage in a stable DC bias range. Therefore, in addition to reducing the power consumption of the second switch, this circuit structure is simple and can achieve the purpose of circuit integration.

Abstract: A light-emitting diode driving circuit includes an AC/DC converting circuit for converting an AC power source into a DC power source; a switching element having an input contact connected to the AC/DC converting circuit; a control unit for outputting a control signal to the switching element at a set frequency to turn on or turn off the switching element, wherein a first resistor is disposed between a power contact thereof and the input contact of the switching element; a second resistor for enabling the control unit to detect a half-cycle voltage of the DC power source; a capacitor having a first end connected to the power contact, and a second end connected to a ground contact of the control unit; and an inductor having a first end connected to the ground contact and the second end of the capacitor, and a second end connected to a light-emitting diode.

Abstract: A photovoltaic circuit configured to supply an output current to a tank module is provided. The photovoltaic circuit comprises a photovoltaic transformation module, a first process module, a plurality of second process modules, and a first control module. The process modules are connected to each other in parallel. The process modules in the parallel connection are connected to the photovoltaic transformation module and the tank module in series. The first control module is connected to the first process module and generates a control signal to the process modules in response to a divided current, a modulation current, and a last output current generated by the first process module. Thereby, the process modules interlacedly output the corresponding modulation current as the output current supplied to the energy reserve module.

Abstract: The present invention discloses a power driving device for an electronic device, comprising: a data input terminal capable of receiving a sequential data comprising at least a first power control sequential data and at least a second power control sequential data; an operation module capable of performing operation on the first power control sequential data and the second power control sequential data to generate a control signal; and a power control module coupled to the operation module to generate at least an output power according to the control signal. Therefore, the control signal can be used to control various power states of an electronic device.

Abstract: A powering circuit of an AC-DC converter, for converting a high AC input voltage into a low DC output voltage to provide a load voltage in a stable DC bias range, includes a rectifier, a sensing circuit, a control switching circuit, and a voltage regulating capacitor. The rectifier has a primary side coupled to an AC power supply and a secondary side for outputting a DC power supply. The sensing circuit compares the AC input voltage with a preset reference voltage, and turns on a second switch in the control switching circuit when the AC input voltage is lower than the reference voltage, thereby providing a low DC output voltage. The control switching circuit sustains the DC output voltage in a stable DC bias range. Therefore, in addition to reducing the power consumption of the second switch, this circuit structure is simple and can achieve the purpose of circuit integration.

Abstract: A signal encoder and a signal decoder involves the signal encoder for receiving a data signal and a clock signal, including a first code output terminal and a second code output terminal. When the data signal is logic one, the signal encoder outputs a modulated signal through the first code output terminal, and outputs a fixed level signal through the second code output terminal. When the data signal is logic zero, the signal encoder outputs the fixed level signal through the first code output terminal, and outputs the modulated signal through the second code output terminal. The signal decoder converts the modulated signal and the fixed level signal output from the signal encoder into the data signal and the clock signal.

Abstract: A drive circuit for light emitting diode (LED) is provided, which is used to drive a plurality of LEDs to emit light. The LEDs are connected in series into a plurality of LED strings. The drive circuit includes a power converter, a detection circuit, and a report circuit. The power converter provides a driving voltage to the LED strings, and the detection circuit detects a string voltage of each LED string, and compares the string voltage with a default reference voltage, so as to determine whether the string voltage is different from the reference voltage (which indicates that the LED string is operated under a non-default state), and sends a detection signal to the report circuit. The report circuit receives the detection signal and outputs the control signal to the power converter, such that the power converter adjusts the driving voltage according to the control signal.

Abstract: A signal encoder and a signal decoder involves the signal encoder for receiving a data signal and a clock signal, including a first code output terminal and a second code output terminal. When the data signal is logic one, the signal encoder outputs a modulated signal through the first code output terminal, and outputs a fixed level signal through the second code output terminal. When the data signal is logic zero, the signal encoder outputs the fixed level signal through the first code output terminal, and outputs the modulated signal through the second code output terminal. The signal decoder converts the modulated signal and the fixed level signal output from the signal encoder into the data signal and the clock signal.

Abstract: The present invention provides method for operating a multipoint control system. It utilizes start packets pass through every one of controlled units which could be modified and transmitted to the next stage to achieve addressing for all of the system.

Abstract: The present invention discloses a set of devices in cascade for driving display devices. For each of the driving devices, the serial-data-in pin and the serial-data-out pin traditionally used to transfer image data can further deliver commands from and/or internal statuses of the driving devices to an external controller. Accordingly, inventive functions of command transfer and/or status feedback can be achieved without adding extra pins. The present invention also discloses a device suitable for forming the driving set, in which a command register and/or a status register is provided.

Abstract: The present invention discloses a light-emitting device, in which at least one light emitting diode and a driver integrated circuit chip are integrally packaged. The driver chip provides a constant current output to the light emitting diode based on characteristics thereof. Accordingly, brightness of the light emitting diode can be precisely adjusted.

Abstract: The present invention discloses a device for generating combining light of desired colors. This device includes at least three light emitting diodes and a current-driving integrated circuit chip encapsuled integrally. The driver chip provides constant current outputs to light emitting diodes of different colors, which are preset based on respective characteristics thereof. As a result, the current input and brightness of each light emitting diode is adjustable and thus combining light of expected color is generated, such as white light of color temperature 6,500˜8,000° K.

Abstract: The present invention discloses a set of devices in cascade for driving display devices. For each of the driving devices, the serial-data-in pin and the serial-data-out pin traditionally used to transfer image data can further deliver commands from and/or internal statuses of the driving devices to an external controller. Accordingly, inventive functions of command transfer and/or status feedback can be achieved without adding extra pins. The present invention also discloses a device suitable for forming the driving set, in which a command register and/or a status register is provided.

Abstract: The present invention discloses an AC/DC converting control circuit, which is used in transformerless AC/DC converting apparatuses. The control circuit primarily includes a current-switch circuit, a duty-control circuit and a load-current limiting circuit. When electrically connecting with a load and a voltage source in series, the control circuit of the present invention reduces the oscillation during on/off switching and provides a stable output current.