Patents Assigned to Chengdu Monolithic Power Systems Co., Ltd.
  • Switching mode power supply and the controller and the method thereof
    Patent number: 9634572
    Abstract: 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.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: April 25, 2017
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yiqing Jin, Yuedong Chen, Sicong Lin
  • Multi-mode power converter and associated control method
    Patent number: 9634570
    Abstract: A multi-mode power converter and associated method for configuring and controlling a multi-mode power converter. The multi-mode power converter may have a boost operation mode and a buck operation mode. A first transistor is coupled between a switching terminal and a ground, and a second transistor and a third transistor are coupled in series between the switching terminal and an output port of the multi-mode power converter. In the buck mode, an on-resistance of the second transistor is regulated to ensure the multi-mode power converter to operate normally in the buck operation mode.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: April 25, 2017
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Yike Li
  • Digitally controlled PFC converter with multiple discontinuous modes
    Patent number: 9621028
    Abstract: 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.
    Type: Grant
    Filed: April 21, 2015
    Date of Patent: April 11, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Sicong Lin, Wenbin Lu, Wangmiao Hu, Lijie Jiang, Qiming Zhao, Guangchao Zhang
  • Trans-conductance regulation circuit, trans-conductance error amplifier and power converter
    Patent number: 9606566
    Abstract: A trans-conductance regulation circuit, a trans-conductance error amplifier module and a power converter. The trans-conductance regulation circuit provides a bias current at least partially based on an output voltage of the power converter. The bias current is sent to bias a trans-conductance operational amplifier in the trans-conductance error amplifier module so that a trans-conductance of the trans-conductance operational amplifier is direct proportional to the output voltage of the power converter. The power converter regulates the output voltage based on a negative feedback loop comprising the trans-conductance error amplifier module. The trans-conductance error amplifier module may help to maintain a band width of the negative feedback loop substantially stable and immune to variations in the output voltage.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: March 28, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Lei Li
  • Switching converter with controllable restart delay and associated control method
    Patent number: 9608509
    Abstract: A switching converter providing an output voltage has a first switch and a control circuit. The control circuit provides an auxiliary power supply voltage, and a switching control signal to control the first switch based on the output voltage and a reference signal. The switching converter is shut down by the control circuit when a fault happens, and the switching converter restarts when the auxiliary power supply voltage decreases to a first threshold.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: March 28, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Li Xu, Yike Li
  • Switching converter with adaptive off time control and the method thereof
    Patent number: 9608519
    Abstract: A switching converter having a power stage with a main switch to convert an input voltage to an output voltage; a current sense circuit generating a current sense signal indicative of a current flowing through the main switch; a PWM generator generating a PWM signal; an OFF time controller generating an OFF time control signal relating to the input voltage and the output voltage; and a logic circuit generating a switching signal based on the OFF time control signal and the PWM signal to control the main switch.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: March 28, 2017
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Chuan Ding, Tianzhu Zhang
  • Battery discharge circuit and discharge method with over discharge protection
    Patent number: 9608516
    Abstract: 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.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: March 28, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Min Xu, Qiming Zhao
  • Switching regulator and the method thereof
    Patent number: 9608510
    Abstract: A switching regulator uses an over voltage comparator to compare an envelop line signal with a reference wave signal, to detect whether the system is in an over voltage condition. The envelop line signal is indicative of a peak value of an inductor current.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: March 28, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Naixing Kuang
  • Efficient control circuit for buck-boost converters and control method thereof
    Patent number: 9602004
    Abstract: A controller used in a buck-boost converter includes a logic control circuit, a pulse width increasing circuit, a pulse width decreasing circuit, a first driving circuit and a second driving circuit. The pulse width increasing circuit generates a sum control signal based on a logic control signal generated by the logic control circuit. The pulse width increasing circuit increases the pulse width of the logic control signal by a first value to generate the pulse width of the sum control signal. The pulse width decreasing circuit generates a difference control signal based on the logic control signal. The pulse width decreasing circuit decreases the pulse width of the logic control signal by a second value to generate the pulse width of the difference control signal. The first and second driving circuit respectively generates driving signals based on the sum control signal and the difference control signal.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: March 21, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Chenggang Deng
  • Isolated switching mode power supply and the method thereof
    Patent number: 9595885
    Abstract: An isolated switching mode power supply, having: an input terminal; an output terminal; a transformer having a primary winding and a secondary winding; a primary power switch coupled to the primary winding; a secondary power switch coupled between the secondary winding and the output terminal of the power supply; a secondary controller configured to generate a frequency modulation signal based on the output voltage and the first feedback signal; a coupled device configured to provide a frequency control signal based on the output voltage and the frequency modulation signal; and a primary controller configured to provide a switching signal to control the primary power switch based on the current sense signal and the frequency control signal.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: March 14, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Siran Wang, Junming Zhang, Yuancheng Ren
  • Bootstrap refresh control circuit, voltage converter and associated method
    Patent number: 9590608
    Abstract: A voltage converter having a bootstrap refresh control circuit and a method for controlling the voltage converter. The bootstrap refresh control circuit monitors a bootstrap voltage across a bootstrap capacitor and provides a high side driving signal to a high side switch of the voltage converter. The bootstrap refresh control circuit also controls the charging of the bootstrap capacitor through decreasing the output voltage of the voltage converter once the bootstrap voltage is dropped to be smaller than a bootstrap refresh threshold. When the output voltage of the voltage converter is decreased enough, the bootstrap refresh control circuit switches the high side switch and the low side switch on and off to refresh the bootstrap voltage.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: March 7, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Li Xu
  • Peak sample circuit for AC voltage and method thereof
    Patent number: 9577514
    Abstract: A peak sample circuit for AC voltage, including: a rectifier coupled to receive an AC voltage and to rectify the AC voltage to generate a rectified signal; a delay circuit coupled to receive the rectified signal and to delay the rectified signal to generate a delayed rectified signal; a comparison circuit coupled to receive the delayed rectified signal and to generate a square signal based on the comparison of the rectified signal and the delayed rectified signal; and a sample output circuit coupled to receive the rectified signal, wherein the sample output circuit samples the rectified signal under the control of the square signal and provides a peak sample signal representative of the peak value of the AC voltage.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: February 21, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Siran Wang, Yike Li, Kun Yi, Yuancheng Ren, Junming Zhang, En Li
  • Power converter with bootstrap circuit
    Patent number: 9577520
    Abstract: A power converter with bootstrap circuit, the power converter has a high side switch, a low side switch, a bootstrap circuit and a bootstrap capacitor for providing a bootstrap voltage to supply a high side driver of the high side switch. The power converter receives an input voltage and provides an output voltage based on driving the high side switch and the low side switch to switch on and off. The bootstrap circuit has a first comparing circuit, a first comparing circuit, a boost circuit and a second charging circuit. The second charging circuit charges the bootstrap capacitor when a voltage difference between the input voltage and the output voltage is smaller than a voltage threshold.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: February 21, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Liping Xiu, Yike Li
  • Switch mode power supply, control circuit and associated control method
    Patent number: 9559586
    Abstract: A switch mode power supply having an output terminal configured to provide an output voltage, the switch mode power supply has a first switch and a control circuit. The control circuit is configured to provide a switching control signal to turn ON and turn OFF the first switch, an on-time period of the first switch is proportional to a first value when the switch mode power supply works in a power saving mode, and the on-time period of the first switch is proportional to a second value when the switch mode power supply works in a normal mode, wherein the first value is larger than the second value.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: January 31, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Qian Ouyang
  • Control circuit with chopping amplifier for switching converter
    Patent number: 9553513
    Abstract: A control circuit for switching converter has a chopping amplifier, a sample-hold circuit, a first comparator, an oscillator and a logic circuit. The chopping amplifier generates an amplified error signal based on a reference signal and a feedback signal. The sample-hold circuit generates a sample-hold signal based on the amplified error signal. The first comparator generates a first logic signal based on a comparison result between the sample-hold signal and a current sensing signal representing a current flowing through a power switch in the switching converter. The oscillator generates a clock signal. The logic circuit generates a control signal based on the first logic signal and the clock signal, the control signal is used to control the power switch.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: January 24, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Li Xu
  • Power converter with pseudo-constant-on-time control and the control circuit and method thereof
    Patent number: 9525342
    Abstract: A control circuit for controlling a switching circuit is disclosed. The control circuit has a ramp compensation circuit, a ramp regulating circuit and a comparison circuit. The ramp compensation circuit generates a ramp compensation signal with the amplitude proportional to the difference between 1 and the duty cycle of a main switch of the switching circuit. The ramp regulating circuit generates a ramp regulating signal with the amplitude proportional to the duty cycle of the main switch. The comparison circuit compares a reference signal with the sum of the ramp compensation signal, the ramp regulating signal and a feedback signal representative of an output voltage of the switching circuit, so as to provide a comparison result to control the switching circuit.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: December 20, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Lei Li
  • Resonant converter, control circuit and associated control method with adaptive dead-time adjustment
    Patent number: 9525358
    Abstract: 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.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: December 20, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Yiqing Jin, Yuedong Chen, Sicong Lin
  • Constant on-time switching converters with ultrasonic mode determination circuit and control methods thereof
    Patent number: 9520778
    Abstract: A control method used in a constant on-time switching converter includes: judging whether the switching converter enters into an ultrasonic mode; turning ON the low-side switch to discharge the output capacitor when the switching converter enters into the ultrasonic mode; generating an additional slope compensation signal during the discharge of the output capacitor; comparing a feedback signal indicative of the output voltage of the switching circuit with the sum of a reference voltage and the additional slope compensation signal; turning OFF the low-side switch and turning ON the high-side switch when the feedback signal decreases to reach the sum of the reference voltage and the additional slope compensation signal.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: December 13, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Lijie Jiang, Chia-Hsin Chang, Wenbin Lu, Wangmiao Hu, Qian Ouyang
  • Soft start circuit for switching converter and associated soft start method
    Patent number: 9496781
    Abstract: A soft start circuit for a switching converter, the soft start circuit has an internal soft start voltage generating circuit, an amplifier circuit and a buffer circuit, the internal soft start voltage generating circuit provides an internal soft start voltage, the amplifier circuit has a first input terminal receiving the internal soft start voltage, a second input terminal receiving a soft start reference signal and an output terminal, the buffer circuit has an input terminal coupled to the output terminal of the amplifier circuit and an output terminal providing the soft start reference signal. An external soft start capacitor coupled to the output terminal of the amplifier circuit is charged to provide an external soft start voltage, and the soft start reference signal is provided based on the internal soft start voltage and the external soft start voltage.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: November 15, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Lei Li
  • Controller with thermal balance and control method thereof for multi-phase switching converters
    Patent number: 9496792
    Abstract: A controller used in a multi-phase switching converter, including: a bias current generator that generates a plurality of bias current signals; a temperature balance modulating circuit that generates a plurality of on time signals based on the plurality of the bias current signals; and a logic circuit that generates a plurality of control signals based on the plurality of on time signals. The plurality of the control signals is used to control a plurality of switching circuits of the multi-phase switching converter.
    Type: Grant
    Filed: June 28, 2014
    Date of Patent: November 15, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Qian Ouyang