Anpec Electronics Corporation

Che-Chang Chang

Yun-Li Liu

Te-Sheng Chen

Chieh-Wen Cheng

Yuan-Hung Wang

Ruei-hung Chiou

Yung-Ning Yang

A dimming control system having an asynchronous pulse width modulation mechanism is provided. When a transition in a level of a synchronous signal meets a specified transition, a width of a pulse wave that is currently generated in a pulse width modulation signal may not reach a preset pulse width. Under this condition, the dimming control system delays generating subsequent pulse waves of the pulse width modulation signal until the width of the pulse wave that is currently generated reaches the preset pulse width. Alternatively, the dimming control system forcibly transits the pulse wave that is currently generated from a high level to a low level to stop increasing the width of the pulse wave, maintains the pulse wave as an incomplete pulse wave, and increases widths of one or more of the subsequent pulse waves of the pulse width modulation signal.

Dimming control system having asynchronous pulse width modulation mechanism

A hub transmission direction control method, a hub and a control circuit are provided. The method includes processes of: detecting a clock signal of a host serial clock line; starting timing when the clock signal meets a trigger condition; when the timed time reaches a preset time, detecting a host data signal of a host data line communicated with a host device and a local data signal of a local data line communicated with a local device; and setting, according to a detection result of the host data signal and the local data signal, a first transmission direction in which data is transmitted from the host data line to the local data line, or a second transmission direction in which data is transmitted from the local data line to the host data line, as a transmission direction between the host data line and the local data line.

Hub transmission direction control method, hub and control circuit

A method of adjusting brightness of a display device is provided. The method includes steps of: generating a synchronization signal having a plurality of periods each of which is a frame time; determining bit values of dithering data according to target brightness data; and determining how many pulse waves in the pulse wave width modulation signal need to be modulated within the frame time according to the bit values of the dithering data, and accordingly modulating widths of the pulse waves of the pulse wave width modulation signal.

Method of adjusting brightness of display device

A dimming signal arranging method used for a light emitting diode display device is provided in the present disclosure. The dimming signal arranging method used for a light emitting diode display device includes the steps: determining whether a total number of dimming unit signals of a dimming signal is greater than a number of frames of a working interval; averagely arranging a first group of the dimming unit signals in at least one frame of the frame groups that is not a predetermined frame of each frame group; arranging a second group of the dimming unit group in at least one predetermined frame of the frame groups; and providing a dimming signal.

Method for generating dimming signal of light emitting diode display device

An audio control circuit is provided in the present disclosure. The audio control circuit includes an input module, a volume signal detecting module and a volume adjusting module. The input module is used for receiving an audio signal. The volume signal detecting module is used for receiving a volume control signal and generates a volume adjusting signal according to the volume control signal. The volume adjusting module is used for receiving the audio signal and the volume adjusting signals and generates an amplified audio signal according to the audio signal and the volume adjusting signal. The volume control signal is a pulse width modulation signal.

Audio control circuit

The present disclosure provides a dimming controller and a backlight module having the same, capable of distributing lighting times of each LED channel to a period of time. The dimming controller can decrease the duration of the LED string of each LED channel while maintaining under the duty cycle, thereby reducing the damage to the transistors. Besides, the dimming controller can turn on the transistors of the LED channels at different time points to avoid the higher current fluctuations at the output end, thereby reducing the flicker of the LED strings.

Dimming controller and backlight module having the same

The present disclosure illustrates a bidirectional wireless charging device. The bidirectional wireless charging device comprises a transceiver chip which is configured to receive a switch signal. The transceiver chip comprises a power stage circuit and a control module. The power stage circuit is coupled to a coil, and the control module is coupled to the power stage circuit. The power stage circuit is configured to output a voltage to the coil, or to receive an induced voltage from the coil. The control module is configured to control the transceiver chip to enter a power mode or a charging mode based upon the switch signal. When the transceiver chip enters the power mode, the transceiver chip provides the voltage to the coil. When the transceiver chip enters the charging mode, the transceiver chip receives the induced voltage from the coil and charges a power storage unit.

Bidirectional wireless charging device and bidirectional wireless charging system

Disclosed is an operation method for LED dimming device. The operation method includes the following steps. Step A: sampling a pulse width modulation signal, and respectively counting for a time period when the pulse width modulation signal is at high level and a time period when the pulse width modulation signal is at low level. Step B: determining whether a rising edge of the pulse width modulation signal is detected. Step C: calculating a duty cycle of the pulse width modulation signal when the rising edge is detected. Step D: resetting a counter module. Step E: driving a LED module according to the duty cycle.

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Hsinchu County, Taiwan

Che-Chang Chang