Patents Assigned to Chengdu Monolithic Power Systems Co., Ltd.
  • Driving circuit and method for buck-boost converter with bootstrap voltage refresh
    Patent number: 10491112
    Abstract: A driving circuit and method for buck-boost converter with bootstrap voltage refresh. The driving circuit includes a first bootstrap capacitor provided a first bootstrap voltage to drive the corresponding switch, and a second bootstrap capacitor provided a second bootstrap voltage to drive the corresponding switch. When converter operates in buck mode and the first or second bootstrap voltage is smaller than a threshold, the driving circuit generates current signals to respectively charge the first and second bootstrap capacitors based on an input voltage, and the first and second bootstrap voltages. When converter operates in boost mode and the first or second bootstrap voltage is smaller than the threshold, the driving circuit generates current signals to respectively charge the first and second bootstrap capacitors based on an output voltage, and the first and second bootstrap voltages.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: November 26, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Lei Li
  • Over current protecting circuit and the method thereof
    Patent number: 10468973
    Abstract: An over current protecting circuit, used with a switching converter having a switch, having: a current limiting circuit, configured to receive a limit indicating signal and to provide an on time signal to control an on time period of the switch based on the limit indicating signal, wherein if the limit indicating signal indicates a current flowing through the switch of the switching converter is larger than a limiting threshold, the on time period of a next switching cycle of the switch is subtracted with a first period, otherwise, the on time period of the switch of the next switching cycle is added with a second period; wherein a maximum on time period of the switch is fixed to be an on time reference.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: November 5, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Xiaokang Wu, Qian Ouyang, Yu Zhang, Xiaogang Wei
  • Signal amplifying system in a hall detecting and amplifying system
    Patent number: 10432159
    Abstract: A signal amplifying system having an oscillator and an amplifying circuit. The oscillator has a first resistor with a first resistance R1 and a first capacitor with a first capacitance C1, and generates an oscillating signal having a frequency f which equals to k1/(R1*C1), k1 is a first proportional parameter. The amplifying circuit has an input terminal to receive an input signal and amplifies the input signal under the control of the oscillating signal. The amplifying circuit has a second resistor with a second resistance R2 and a second capacitor with a second capacitance C2. The amplifying circuit has a ?3 dB bandwidth W?3 dB which equals to k2/(R2*C2), k2 is a second proportional parameter. In this signal amplifying system, the product of the first resistance R1 and the first capacitance C1 is proportional to the product of the second resistance R2 and the second capacitance C2.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: October 1, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Zhijiang Yang
  • Control circuit for synchronous rectifier and the method thereof
    Patent number: 10432104
    Abstract: A synchronous switching converter with an energy storage component and a synchronous rectifier coupled to the energy storage component, having: a secondary control circuit configured to receive a slew rate threshold adjusting signal and a voltage across the synchronous rectifier, and to provide a secondary control signal; wherein the secondary control circuit detects a slew rate of the voltage across the synchronous rectifier, and maintains the synchronous rectifier being off when the slew rate of the voltage across the synchronous rectifier is lower than a slew rate threshold.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: October 1, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Hui Li, Lei Miao, Siran Wang, Lin Feng
  • Resonant converter with improved light load efficiency and the method thereof
    Patent number: 10425013
    Abstract: A resonant converter highly improves light load efficiency. The resonant converter blocks control signals which are used to control power switches in an input power stage and an output stage in light load condition until an output voltage drops to a preset value. The input power stage and the output stage are coupled by way of a resonant net and a transformer.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: September 24, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Qian Ouyang
  • Control circuit for voltage regulator with reference signal generating and associated method
    Patent number: 10404153
    Abstract: A method for controlling a voltage regulator is receiving a voltage identification code which has a pulse width modulation signal, providing a duty signal via measuring a duty cycle of the pulse width modulation signal, calculating a target voltage based on the duty signal, providing a reference signal via filtering the duty signal by a first filter if the voltage identification code varies, and providing the reference signal via filtering the duty signal by a second filter if the reference signal is in a range determined by the target voltage.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: September 3, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Binci Xu, Lijie Jiang, Chao Liu, Tao Zhao
  • Digital controlled battery charging system
    Patent number: 10381854
    Abstract: 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.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: August 13, 2019
    Assignee: Chengdu Monolithic Power Systems co., Ltd.
    Inventors: Min Xu, Qiming Zhao, Xiaoqing Li
  • Power supply circuit for computing platform
    Patent number: 10348115
    Abstract: A system has a processor, a battery charging circuit, a voltage regulating circuit and a control circuit. The control circuit provides digitalized feedback signals representative of circuit parameters of the battery charging circuit and circuit parameters of the voltage regulating circuit to the processor and receives a first information and a second information from the processor. The processor is able to adjust its operating states in response to the digitalized feedback signals. The control circuit controls the battery charging circuit in response to the circuit parameters of the battery charging circuit and the first information received from the processor, and the control circuit controls the voltage regulating circuit in response to the circuit parameters of the voltage regulating circuit and the second information received from the processor.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: July 9, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Qian Ouyang
  • Switching converter with quasi-resonant control and the method thereof
    Patent number: 10348182
    Abstract: A switching converter with quasi-resonant control having a switch and an energy storage component, comprising a peak current regulating circuit configured to provide a peak current regulating signal to regulate a peak current signal or a current sense signal, wherein the peak current regulating signal is adjusted when non-CCM (Current Continuous Mode) and non-valley-switching are detected.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: July 9, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Siran Wang
  • Oscillator with inherent comparator delay influence eliminated
    Patent number: 10348277
    Abstract: There is provided an oscillator which includes a current source, a capacitor coupled between the current source and a reference ground, a first switch coupled to the capacitor in parallel, an error amplifier, a comparator and a one-shot circuit. The error amplifier is coupled to the capacitor and configured to generate a regulation voltage based on a reference voltage and the voltage across the capacitor. The comparator is configured to compare the voltage across the capacitor with the regulation voltage and generate a comparison signal. The one-shot circuit is coupled to the comparator, wherein based on the comparison signal, the one-shot circuit generates a trigger signal to control the first switch.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: July 9, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Li Xu
  • Supply voltage generating circuit and associated integrated circuit
    Patent number: 10348215
    Abstract: A supply voltage generating circuit for generating a supply voltage signal to supply the active elements of an AC-DC voltage converter. The supply voltage generating circuit has a charging switch, a charging diode and a charging capacitor. When a main switch of the AC-DC voltage converter is turned on, the charging switch is turned on. Primary current flows through the charging switch and the main switch to the logic ground. When the main switch is turned off and the voltage across the charging capacitor is smaller than a charging threshold, the charging switch is kept on for a period of time and the primary current flows through the charging switch and the charging diode to the charging capacitor. When the period of time is expired or the supply voltage signal is larger than the charging threshold signal, the charging switch is turned off.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: July 9, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Lin Feng
  • Power converter with average current detection and the detecting circuit and method thereof
    Patent number: 10261113
    Abstract: A power converter with average current detection and the corresponding detecting method and detecting circuit are disclosed. The average current detecting circuit has an average voltage detecting circuit and a voltage-current converting circuit. The average voltage detecting circuit generates a voltage across a detecting resistor by letting an inductor current flowing through an output inductor of the power converter flowing through the detecting resistor. Further, the average voltage detecting circuit samples the voltage across the detecting resistor when a switch of the power converter transits from an on state into an off state and the opposite and then calculates the average value of the two sampled voltages. The voltage-current converting circuit converts the average value into an average current by multiplying the average value by a scaling factor.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: April 16, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Yike Li
  • Resonant converter with adaptive switching frequency and the method thereof
    Patent number: 10263528
    Abstract: A resonant converter with adaptive switching frequency operates continuously at best efficiency point. A power switch at primary side is turned off when a current flowing through a corresponding output power stage at secondary side falls to zero.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: April 16, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Qian Ouyang
  • Current sensing circuit and integrated circuit for four-switch buck-boost convertor
    Patent number: 10254314
    Abstract: A current sensing circuit used in a buck-boost converter having a pair of buck switches and a pair of boost switches, including: a first sensing circuit providing a detection current though a first normally-ON transistor and a second normally-ON transistor, and a second sensing circuit detecting an average of the detection current and providing a current sensing signal in accordance with the average. During a turn ON time of a first low side switch of the pair of buck switches, the detection current represents a current flowing through the first low side switch, the current sensing signal represents an output current. During a turn ON time of the second low side switch of the pair of boost switches, the detection current represents a current flowing through the second low side switch, and the current sensing signal represents an input current.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: April 9, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Lei Li
  • Multi-phase power supply with DC-DC converter integrated circuits having current sharing function
    Patent number: 10256727
    Abstract: An interleaved multi-phase power supply with a plurality of DC-DC converter ICs. Each DC-DC converter IC has a current sharing pin, and the current sharing pins of the plurality of DC-DC converter ICs are connected together. Each DC-DC converter IC receives a feedback voltage signal to compare with a reference voltage signal to generate an error voltage signal as a reference of an output current of the corresponding DC-DC converter IC. And each DC-DC converter IC has a mismatch voltage regulation module regulating the error voltage signal to be equal to an average of error voltage signals of the plurality of DC-DC converter ICs.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: April 9, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Wanke Tao, Tianzhu Zhang
  • Control circuit for buck-boost power converter with seamless mode transition control
    Patent number: 10250141
    Abstract: A buck-boost power converter and a control circuit for the buck-boost converter. The control circuit includes a buck cycle pulse width modulation module and a boost cycle pulse width modulation module respectively having a first controllable hysteresis and a second controllable hysteresis. The buck cycle pulse width modulation module can regulate the first controllable hysteresis during the buck-boost power converter transits between a buck mode and a buck-boost mode so as to eliminate or at least reduce sparks in an output voltage. The boost cycle pulse width modulation module can regulate the second controllable hysteresis during the buck-boost power converter transits between the buck-boost mode and a boost mode so as to eliminate or at least reduce sparks in the output voltage.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: April 2, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Jian Zhang
  • Integrated circuit for switching converter and method for providing power supply voltage to the same
    Patent number: 10224823
    Abstract: An integrated circuit used for a switching converter has a power supply circuit for providing a power supply voltage, and a control circuit. The switching converter has a switching circuit converting a DC input voltage into an output signal. The power supply circuit has a protection circuit, an UVLO unit and a current source coupled to a power supply capacitor. The protection circuit detects whether the DC input voltage is at a brown-in state. The UVLO unit generates a lock out signal by comparing the power supply voltage with a upper threshold voltage and a lower threshold voltage. The lower threshold voltage is selectively limited to one of a first value or a second value based on the detection. The second value is less than the first value. The current source provides the power supply voltage under the control of the lock out signal.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: March 5, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Yuedong Chen
  • Resonant converter with adaptive on-time control and the method thereof
    Patent number: 10186975
    Abstract: A resonant converter adopts adaptive on-time control to provide better transient response. When the output voltage of the resonant converter varies, the on-time length of a power switch in power stages is adjusted, so that the switching frequency and the gain are regulated and optimized.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: January 22, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Qian Ouyang
  • Control circuit for buck-boost power converter with stable bootstrap voltage refresh
    Patent number: 10181793
    Abstract: A buck-boost power converter and a control circuit for the buck-boost converter. The buck-boost power converter includes a first power switch and a second power switch coupled in series between an input port and a reference ground, and a third power switch and a fourth power switch coupled in series between an output port and the reference ground. The control circuit receives a pulse skipping control signal and a zero-crossing indication signal, and controls the second power switch and/or the third power switch to turn on when the pulse skipping control signal controls the buck-boost power converter to enter into a pulse skipping mode and the zero-crossing indication signal indicates that an output inductor current of the buck-boost power converter crosses zero.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: January 15, 2019
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Jian Zhang
  • Non-audible control circuit for a buck converter in DCM mode
    Patent number: 10164514
    Abstract: Noise-free control circuit and control method for controlling a switching converter to avoid generating audile noises. The noise-free control circuit has a timer used to set a noise-free frequency threshed. When the switching frequency of the switching converter is decreased to the noise-free frequency threshold, the switching frequency of the switching converter is limited to the noise-free frequency threshold. The noise-free frequency threshold is higher than a maximum audible frequency of an audio noise.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: December 25, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Lei Li