Shenzhen Sendis Semiconductor Co., Ltd

Other

Shenzhen Sendis Green Power Integrations Technology Corporation

Xunsheng Deng

Yanquan Mai

Xiaoyu Chen

Bo Song Chen

Wenpan Wang

Jian Ding

Jing Zhang

Bo Chen

Yu'An Ye

Hengyou Chen

Disclosed are detection circuit and device of TRIAC dimmer and detection method. Detection circuit comprises line voltage sampling module, peak voltage sampling module, average voltage sampling module, judgment module, bleeder module, line voltage sampling module samples line voltage, outputs sampling voltage to peak voltage sampling module and average voltage sampling module; peak voltage sampling module outputs first comparison voltage to judgment module according to sampling voltage, average voltage sampling module outputs second comparison voltage to judgment module according to sampling voltage; judgment module compares first comparison voltage with second comparison voltage and outputs control signal according to comparison result to control connection or disconnection of bleeder module; bleeder module provides discharge current for TRIAC dimmer when being connected. According to invention, problem that detection result of TRIAC dimmer is unreliable can be effectively solved, and detection accuracy is improved.

Detection circuit and device of TRIAC dimmer and detection method

Device time synchronization control method in wireless mesh network, comprising: pulse converter converts input AC into periodic pulse signal; controller sends time setting instruction to adjacent node device at preset time; adjacent node device updates device time according to preset algorithm when periodic signal is on rising edge or falling edge, take updated device time as setting time and forward to other adjacent node devices before arrival of next rising edge or falling edge; other adjacent devices update own device time when periodic signal is on rising edge or falling edge; after all node devices finish updating device time, controller sends control commands, and all node devices execute synchronously upon arrival of execution time. Node devices update own time according to pulse signal changes, realizing clock synchronization and synchronization control over node devices by uniform execution time.

Device time synchronization control method and system in wireless mesh network

A multi-segment linear LED drive circuit, device and method. A Multi-segment linear LED drive circuit includes a reference voltage input module, current source module, voltage control module, current regulation module, at least two LED light strings connected in series and at least two driving modules correspondingly. The reference voltage input module provides reference voltage for each of driving module; the current source module provides DC current for voltage control module; the voltage control module controls input voltage of driving module according to DC current; the driving module lights corresponding LED light string on or off according to reference voltage, input voltage and line voltage constant current; the current adjusting module adjusts constant current; constant current of rear driving module is greater than that of front driving module, and when current passes through rear driving module, front driving module stops driving, harmonic influence and circuit implementation cost are reduced.

Multi-segment linear LED drive circuit, device and driving method

An apparatus and method for simultaneously adjusting brightness and color temperature, and an LED lamp. The apparatus includes a phase control dimmer, a rectification module, a phase detection module, a current control module and an LED module. Cutting the phase of an input alternating current by the phase control dimmer changes the effective voltage of the alternating current, then the cut alternating current is rectified by the rectification module and output to the LED module, thus adjusting the brightness of the LED module; information about the cut phase is detected by the phase detection module and a current control signal is output to a current control module according to the cut phase information, and the current control module controls change in the brightness ratio of mixed colors of the LED module according to the current control signal and adjusts the color temperature of the LED module.

Apparatus and method for simultaneously adjusting brightness and color temperature, and LED lamp

An LED driving device and a constant power dimming circuit and dimming method therefor. The constant power dimming circuit comprises a line voltage compensation module, a modulation module, a filtering module, and a constant current source module. The line voltage compensation module detects changes in line voltage and outputs a first reference voltage. The modulation module modulates the first reference voltage and outputs to the filtering module a second reference voltage. The filtering module filters the second reference voltage signal and then outputs a third reference voltage to the constant current source module. The constant current source module outputs constant current to drive an LED load to operate. By controlling a constant current source circuit, when the duty cycle of the PWM signal is not changed but a mains input voltage is changed, the input power of the system can be maintained constant, and voltage flicker is reduced.

LED driving device, constant-power dimming circuit and dimming method thereof

A system and method using a switch to realize light fixture dimming and state restoration. The system comprises a switch, a line voltage sampling module, a switching action judging module and a dimming control module. The switch connects to at least one light fixture. The line voltage sampling module samples a rectified line voltage output and outputs a corresponding voltage level signal. The switching action judging module identifies and determines a current switching action and outputs a corresponding control instruction to the dimming control module. The dimming control module regulates the lighting state of each light fixture or controls each light fixture to return to its initial lighting state. By identifying and judging switching actions to realize light fixture dimming and state restoration control, the invention can realize a regular dimming function, and can quickly restore the light to a preset initial lighting state.

System and method using switch to realize light fixture dimming and state restoration

A linear constant current LED drive device capable of driving reduced number of LEDs, comprises: a rectifier module, an energy storage component, a switch module, a constant current supply module, a measurement module and a control module. When voltage differences between two ends of both switch module and constant current supply module are less than according threshold voltages, control module turns on switch module, enabling rectifier module to charge energy storage component and LED string lights. When voltage difference between two ends of either switch module or constant current supply module exceeds according threshold voltage, control module turns off switch module, enabling energy storage component to charge LED string lights. So rectifier module and energy storage component supply electricity to plurality of LED string lights alternately, number of LEDs can be reduced, while maintaining high drive efficiency.

Linear constant current LED drive device capable of driving reduced number of LEDs

Disclosed is a line voltage compensation AC LED driving device. The line voltage compensation AC LED driving device comprises a line voltage compensation module and an AC LED driving module. The line voltage compensation module detects an output voltage of a rectifier bridge, and outputs a corresponding line voltage compensation reference voltage to the AC LED driving module according to the change of the output voltage of the rectifier bridge, and the AC LED driving module adjusts a driving current in real time according to the line voltage compensation reference voltage to keep the output power unchanged. In the present invention, the line voltage compensation module detects the output voltage of the rectifier bridge, and outputs the corresponding line voltage compensation reference voltage to the AC LED driving module according to the change of the output voltage of the rectifier bridge, and the AC LED driving module adjusts the driving current in real time according to the line voltage compensation reference voltage to keep the output power unchanged, and therefore the output luminous flux of a lamp can be basically unchanged, the luminance of the LED lamp is stable, and the voltage flicker of the LED lamp is eliminated.

Line voltage compensation AC LED driving device

The invention discloses an LED driving device for dynamic segment configurations and the LED lighting apparatus thereof, wherein, the said LED driving device includes a first adjustable LED lamp string unit, a first N-type switch module, at least one second adjustable LED lamp string unit, one unidirectional conduction unit, one P-type switch module, one second N-type switch module, control logic module and current detection module; the control logic module outputs control signals, based on output voltage changes from the bridge rectifier, to control the on and off states of the first adjustable LED lamp string unit, the adjustable LED lamp string module, the P-type switch module, the first and second N-type switch module, also it adjusts the parallel and serial connection states of the first and second adjustable LED lamp string units dynamically. The invention adopts the dynamically configuring technology, improving the lighting effects and the utilization of LED lamps.

LED driving device for dynamic segment configurations and the LED lighting apparatus thereof

The present invention discloses a driving device for LED and the driving method thereof, includes: a bridge rectifier, at least one LED-lamp bunch and LED-lamp group and P-type switching module and N-type driving module, and a logic controller; the LED-lamp bunch and group are connected orderly in series; the bridge rectifier's positive end connects to the LED-lamp bunch's anode, while a negative end gets grounded; the logic controller connects to the anode and cathode of LED-lamp bunch through the P-type switching module respectively, the cathode of LED-lamp group through N-type driving module, and the negative input end of the bridge rectifier; by controlling the N-type driving module and P-type switching module makes the number of lit-on LED-lamps change following the rectified input signal voltage changes; thus its efficiency is improved and easy to be integrated into chips.

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Shenzhen, China

Xunsheng Deng