Chengdu Monolithic Power Systems Co., Ltd.

Hangzhou Mps Semiconductor Technology Ltd.

Monolithic Power Systems, Inc.

Qiming Zhao

Min Xu

Eric X Yang

Naixing Kuang

Licheng Sheng

Hongqiang Qin

Bo Yu

Lijie Jiang

Guangchao Zhang

Bairen Liu

Wenbin Lu

Sicong Lin

Xiaoqing Li

Siran Wang

Rui Wang

Wangmiao Hu

Kai Wang

Fei Xiong

John Wiggenhorn

Long Li

Xiaoli Kong

Jianyu Xie

Xue Jiang

Yimin Liang

Yishan Ma

A BLDC motor system having a power stage, a hall sensor and a logical control circuit is discussed. The BLDC motor system improves performances by judging an initial rotation direction through the back electromotive force generated by the stator together with the induced signal sensed by the hall sensor.

BLDC motor system with reduced power loss and the initial rotation direction judging method thereof

A motor control system has a computing device and a motor controller. The computing device receives user demands through a GUI, and provides a preset speed table based on the user demands. The preset speed table has a plurality of fixed values of a duty cycle of a pulse width modulation signal and a plurality of preset values of a preset motor speed corresponding to the plurality of fixed values of the duty cycle of the pulse width modulation signal. The motor controller provides the pulse width modulation signal to drive a motor based on the preset speed table.

Motor control system and associated method to control motor speed

A battery balancing method and circuit for balancing the voltages between battery units with a fly capacitor. In a first time period of a switching cycle, the first battery unit is used to charge the fly capacitor or the first battery unit is used to discharge the fly capacitor, depending on which of the first battery unit and the fly capacitor having a larger voltage value; and in a second time period of the switching cycle, the second battery unit is used to charge the fly capacitor or the second battery unit is used to discharge the fly capacitor, depending on which of the second battery unit and the fly capacitor having a larger voltage value.

Battery balancing circuit balancing voltages between battery units with a fly capacitor

A battery charging system has a switching circuit and a control circuit. The switching circuit has a first switch, and the control circuit has a plurality of analog control loops and a digital control unit. Each of the analog control loops provides a loop control signal based on a corresponding feedback signal, a corresponding reference signal and a slope compensation signal. The digital control unit provides a switching control signal to control the first switch based on the plurality of analog control loops and a time period control signal, and the digital control unit turns ON or turns OFF the first switch automatically in response to one of the plurality of analog control loops.

Digital controlled battery charging system

A charging circuit adopts a plurality of feedback control circuits, a constant time signal generator and a logic circuit to control the operation of a power switch. The charge circuit needs no oscillator with high frequency, error amplifier with high speed and high accuracy, or compensation circuit with complicated structure, so the system portability is highly improved.

Charging circuit and the method thereof

A battery charging circuit has a first switching circuit and a second switching circuit which are coupled in parallel. A control circuit has a plurality of feedback control loops, a logic integrated circuit, a first logic circuit and a second logic circuit, wherein the plurality of feedback control loops provides a plurality of feedback control signals, the logic integrated circuit provides a logic integrated signal based on the plurality of feedback control signals, the frequency dividing circuit provides a first frequency dividing signal and a second frequency dividing signal based on the logic integrated signal, the first logic circuit controls the first switching circuit based on the first frequency dividing signal and a first duration signal, the second logic circuit controls the second switching circuit based on the second frequency dividing signal and a second duration signal.

Battery charging circuit with high capacity, control circuit and associated control method

A battery charging circuit has a first switching circuit and a second switching circuit coupled in parallel between an input port and a node, a first switch coupled between the node and a system ground, a second switch coupled between the node and an output port, and a control circuit. When an input voltage is higher than a system voltage, the control circuit controls the first switching circuit and the second switching circuit turned ON and OFF with interleaving, the first switch maintains OFF and the second switch maintains ON. When the input voltage is lower than the system voltage, the control circuit controls the first switch and the second switch turned ON and OFF, and at least one of the first switching circuit and the second switching circuit maintains ON.

Buck-boost battery charging circuit, control circuit and associated control method

A battery fuel gauge current sensing circuit includes: a sense unit coupled in series with the battery and configured to sense the battery current; a control unit configured to adjust the ON resistance of the sense unit based on the comparison of the voltage across the sense unit and a threshold voltage until the voltage across the sense unit is greater than the threshold voltage; and a sample unit coupled across the sense unit and configured to sample the voltage across the sense unit and to provide an analog sample voltage when the voltage across the sense unit is greater than the threshold voltage.

Battery fuel gauge current sensing circuit and method thereof

A LED driver adopts one power stage to provide a constant drive current to drive a load, and to provide different power supply voltages to power a smart module according to a dimming signal input by users through the smart module. The LED driver provides high performance with simple circuit structure.

Smart LED driver and LED drive method

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 power bank circuit controlling power switches to operate at different modes in accordance with different external coupling situations is discussed. The power bank circuit may be coupled to either a power source, a digital device, or a plurality of series coupled batteries at a high voltage port; and may be coupled to either a power source, a digital device, or a single battery at a low voltage port.

Power bank circuit and the method thereof

A method of capacitive mode detection is used in a resonant converter. The resonant converter has a square wave generator having a first switch and a second switch, a resonant network, an isolated transformer having a primary winding and a second winding, and a rectifier network providing an output DC voltage for a load. The method of capacitive mode detection includes: detecting a voltage of the secondary winding and generating a voltage detection signal; detecting an output DC voltage of the rectifier network and generating a voltage detecting threshold; comparing the voltage detection signal with the voltage detection threshold when either of the first and the second switches is turned OFF; generating a flag signal indicating whether the resonant converter enters into a capacitive mode based on the comparison result.

Resonant converter with capacitive mode detection and associated detection method

A primary control LED driver includes: a switching converter having a main switch and a first winding, and configured to provide an LED driving current; a second winding magnetically coupled to the first winding and configured to provide a power supply voltage at a first terminal; a first sensing resistor with a first terminal coupled to the main switch; a second sensing resistor with a first terminal coupled to the second terminals of the first sensing resistor and the second winding; an output current calculator calculating an equivalent value of the LED driving current based on the voltage at the first terminal of the first sensing resistor; an error amplifier configured to generate a compensation signal based on the equivalent value and a reference voltage; and a control circuit generating a control signal to control the main switch based on the compensation signal.

Primary control LED driver with additional power output and control 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 battery discharge circuit has a switching circuit and a controller. The switching circuit is coupled between a battery and a load. The controller is configured to generate a control signal to control the switching circuit. When the battery voltage drops below a first reference voltage, the controller adjusts the control signal to regulate the battery voltage to be equal to the first reference voltage.

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Hangzhou, China

Qiming Zhao