Chengdu Monolithic Power Systems Co., Ltd.

Other

Sicong Lin

Yiqing Jin

Lijie Jiang

Qiming Zhao

Yuedong Chen

Guangchao Zhang

Wenbin Lu

Yuancheng Ren

Junming Zhang

Wangmiao Hu

Zhengxing Li

Lianfeng Ding

An isolated switching converter includes a transformer, a primary circuit, a rectifying circuit and an optocoupler with a photo-sensitive device and a light emitting device, wherein the light emitting device has a first terminal coupled to an output voltage of the switching converter. A method for controlling the switching converter includes: sensing the output voltage and generating a voltage feedback signal; generating an error amplifying signal based on a reference signal and the voltage feedback signal, and providing the error amplifying signal to a second terminal of the light emitting device; disconnecting the error amplifying signal from the second terminal of the light emitting device if the error amplifying signal becomes lower than a first threshold voltage; and reconnecting the error amplifying signal to the second terminal of the light emitting device when the voltage reference signal becomes lower than a second threshold voltage.

Isolated switching converter with optocoupler and secondary control circuit thereof

A digital PFC circuit with improved power factor is described. The digital PFC circuit uses a compensation current generating unit and a reference current adjust unit to eliminate the effect of a current flowing through an input capacitor to the input current, so that the input current and the input line voltage of the digital PFC circuit are controlled to be in-phase.

PFC control circuit, digital PFC circuit and the method thereof

A switching mode power supply with resonant technology. The switching mode power supply current uses current polarity evaluation to avoid capacitive mode by triggering the capacitive protection if the evaluation indicates that the system will enter capacitive mode.

Switching mode power supply and the controller and the method thereof

A PFC circuit having a switching circuit and a control circuit, the control circuit controls an operation mode of the switching circuit based on an input current and a switching frequency of the switching circuit, when the switching circuit works under a continuous current mode, the switching circuit is turned ON when the input current is less than an OFF current reference signal, and when the switching circuit works under a first discontinuous mode or a second discontinuous mode, the switching circuit is turned ON after a turn ON delay time period when the input current is less than the OFF current reference signal.

Digitally controlled PFC converter with multiple discontinuous modes

A resonant converter has a switching circuit having a first switch and a second switch, a control circuit and a resonant circuit. The control circuit has a slope sensing circuit providing a slope sense signal based on a voltage variation at the common node of the first switch and the second switch, a slope judge circuit providing a slope judge signal, and a turn-ON control circuit providing a first reset signal to adjust a first dead-time period from turning OFF the first switch to turning ON the second switch based on the slope judge signal, the slope signal, and a current flowing through the resonant tank, and providing a second reset signal to adjust a second dead-time period from turning OFF the second switch to turning ON the first switch based on the slope judge signal, the slope signal, and the current flowing through the resonant tank.

Resonant converter, control circuit and associated control method with adaptive dead-time adjustment

A PFC circuit includes: a switching circuit having a power switch; an on time control circuit for controlling an on time period of the power switch; a first off time control circuit; a second off time control circuit; and a logic circuit selectively controls the power switch working under CCM or DCM; when working under CCM, the first off time control circuit controls an off time period of the power switch and when working under DCM, the second off time control circuit controls the off time period of the power switch.

Multi-mode PFC control and control method thereof

A boost PFC converter, a method and a control circuit used for boost PFC converter are discussed in the present invention. The boost PFC converter decreases the switching frequency when a line voltage is around zero, so that the whole operating efficiency is not decreased.

Boost PFC converter, method and control circuit used for boost PFC converter

A power factor correction circuit including a rectifier bridge, an energy storage component, a power switch, a second switch and a control circuit provides reduced THD and improved PF performance under a high input AC voltage.

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Hangzhou, China

Sicong Lin