Silergy Semiconductor Technology (hangzhou) Ltd

Jianxin Wang

Huiqiang Chen

Hongbin Lai

Longqi Wang

Qiukai Huang

Zhishuo Wang

Qingliang Zheng

Xiaoqiang Xu

Ligang Xu

Wei P Chen

Hao Chen

Wei Ye Chen

Guojia Liu

Yuanyu Yang

A single wire serial communication method for a system having a master device and a plurality of slave devices sequentially connected by a single wire can include: in each communication, transmitting a data packet by the master device, and sequentially receiving the data packet by each of the slave devices; receiving the data packet and forwarding the data packet to a next slave device by a current slave device, where each of the plurality of slave devices when receiving the data packet serve as the current slave device; modifying device address data in the data packet by the current slave device; and comparing the device address data in the data packet received by the current slave device against a preset data or the device address data in the data packet transmitted by the master device, in order to find at least one target slave device in the communication.

Single wire serial communication method and single wire serial communication system

A voltage converter can include: an input end configured to receive an input voltage; an output end configured to generate an output voltage; N switched capacitor circuits sequentially coupled in series between the input end and the output end, where N is a positive integer greater than or equal to 2; where each switched capacitor circuit comprises a switch circuit and a flying capacitor, and at least the flying capacitor of an i-th switched capacitor circuit is configured as an output capacitor of an (i−1)-th switched capacitor circuit, where i is a positive integer that is greater than or equal to 2 and less than or equal to N; and a first energy storage element coupled to the output end.

Voltage converter having switched capacitor circuits

A control circuit for a switching converter having a main power switch and an auxiliary power switch, where the control circuit is configured to: charge and discharge a junction capacitor of the main power switch during a turn-off period of the main power switch; and adjust a conduction time of the auxiliary power switch according to a difference between the charged and discharged charge levels across the junction capacitor.

Switching converter and control circuit thereof

A method of controlling a power convertor to perform diming control for a light-emitting diode (LED) load, can include: adjusting a length of a switching period of the power converter in accordance with a dimming signal; and controlling the power converter to generate a drive current corresponding to the dimming signal.

Dimming control method, dimming control circuit and power converter thereof

A control circuit for a switching converter, where: the control circuit is configured to generate a switching control signal according to an output voltage of the switching converter to control a switching state of a power transistor in the switching converter, and to adjust an output current of the switching converter; and a change trend of a length of a switching period of the power transistor is opposite to a change trend of the output voltage.

Control circuit for a switching converter

A control circuit for controlling an AC-DC power supply, can include: a pulse-width modulation (PWM) signal generating circuit configured to generate a PWM signal in accordance with a reference voltage and a current sampling signal representing an inductor current flowing through an inductor of the AC-DC power supply, and to control a power stage circuit of the AC-DC power supply in accordance with the PWM signal; and a reference voltage generating circuit configured to generate the reference voltage based on an input voltage of the AC-DC power supply.

Control method and control circuit for an AC-DC power supply

A dimming signal generation circuit configured for an LED driver can include: a voltage-type dimmer configured to generate a dimming voltage; a dimming control circuit comprising a transformer and a power switch coupled in series between a first voltage and ground; where a secondary side of the transformer is coupled to the voltage-type dimmer is configured to receive the dimming voltage; where a primary side of the transformer is configured to receive the first voltage; and where a dimming reference signal is generated at the primary side of the transformer in accordance with the dimming voltage.

Dimming signal generation circuit, dimming signal generation method and LED driver

A dimming control circuit for an LED driver, can include: an adjusting circuit configured to generate an adjusting signal in accordance with a PWM dimming signal; and where a switching state of a power transistor of the LED driver is adjusted in accordance with the adjusting signal and a constant current control signal. A dimming control method for an LED driver, can include: determining a first threshold in accordance with a frequency of the PWM dimming signal and a frequency range of audio noise; generating an adjusting signal having a first duty cycle when a duty cycle of a PWM dimming signal is not greater than the first threshold; and controlling, by the adjusting signal, a switching state of a power transistor in the LED driver, where the first duty cycle is greater than the duty cycle of the PWM dimming signal.

Dimming control circuit, dimming control method and LED driver thereof

A method of controlling a power convertor to perform dimming control for a light-emitting diode (LED) load, can include: adjusting a length of a switching period of the power converter in accordance with a dimming signal; and controlling the power converter to generate a drive current corresponding to the dimming signal.

A power converter for an LED drive circuit, can include: a capacitor and an LED load coupled in parallel to receive an output signal of a rectifier circuit; a power switch coupled in series with the LED load, and being configured to control a current path from the rectifier circuit to the LED load; and a control circuit configured to control the power switch to be turned off in accordance with an error between an output current flowing through the LED load and a desired current value to decrease power consumption of the power switch, where the operation of the power switch is controlled to transition between on and off states in each sinusoidal half-wave period.

Power converter, LED driver and control method

A current drive circuit applied in an LED drive circuit that is compatible with a triac dimmer and is configured to generate a direct current bus voltage includes: a current generation circuit configured to receive the direct current bus voltage, and to generate a drive current based on a PWM dimming signal, in order to drive an LED load; and an input current regulation circuit configured to generate a regulation signal based on a duty cycle of the PWM dimming signal, in order to control an operation state of the triac dimmer.

Current drive circuit and method, and light emitting diode lighting device thereof

A leakage protection circuit can include: a pull-down current generation circuit coupled between output terminals of a rectifier circuit; and a control circuit configured to control the pull-down current generation circuit to generate a pull-down current during a predetermined time interval, and to determine whether leakage occurs in accordance with a voltage detection signal that is representative of an output voltage of the rectifier circuit.

Leakage protection circuit, leakage protection method and load driving circuit

A power converter can include: a rectifier circuit; a silicon controlled dimmer coupled between an AC input terminal and an input terminal of the rectifier circuit; and a bleeder circuit coupled to an output terminal of the rectifier circuit, and being configured to provide a bleeder current after the silicon controlled dimmer is turned off. A method of controlling a power converter, can include: generating a bleeder current flowing though output terminals of a rectifier circuit of the power converter after a silicon controlled dimmer is turned off; and where the silicon controlled dimmer coupled to the rectifier circuit receives an AC input voltage.

Power converter and control method thereof

An LED drive circuit can include: a transistor and an LED load coupled in series, and being configured to receive a direct current bus voltage, and to generate an input current; and a control circuit configured to generate a drive signal to control an operation state of the transistor to control a distribution range of the input current by controlling an amount of accumulated charge of the input current during a half power frequency period.

LED drive circuit and method thereof

An apparatus for an LED driver with a silicon-controlled dimmer, can include: a bleeder circuit coupled to a DC bus of the LED driver; and a controller configured to control the bleeder circuit to draw a bleeder current from the DC bus when a conduction angle of the silicon-controlled dimmer is less than an angle threshold, in order to maintain a conduction state of the silicon-controlled dimmer.

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Hangzhou, China

Jianxin Wang