Patents Assigned to Chengdu Monolithic Power Systems Co., Ltd.
  • Patent number: 10855171
    Abstract: A control method of a PFC (Power Factor Correction) circuit having at least one power switch, the control method having: producing an effective value of an input voltage; generating a compensation signal based on an output voltage and an output voltage reference signal; generating an on time signal based on the compensation signal, the effective value of the input voltage, a first on time period value and a second on time period value; generating an on time delay signal based on the input voltage, the output voltage, the first on time period value, the effective value of the input voltage and the compensation signal; and generating a current valley signal based on the input voltage, the effective value of the input voltage, the compensation signal, the second on time period value, and an inductance value of the inductor adopted by the PFC circuit.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: December 1, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Wenbin Lu
  • Patent number: 10826401
    Abstract: Input AC voltage sensing for a flyback circuit. The flyback circuit is configured as “primary-high”, namely a primary switch of the flyback circuit is positioned “high” to receive an input AC voltage through a first rectifying circuit. A primary winding of the flyback circuit is coupled to a primary ground reference. A voltage sensing circuit has a processing circuit and a first sensing resistor. The processing circuit has a first terminal coupled to the input AC source through a second rectifying circuit, a second terminal coupled to the primary ground reference and an output terminal. The processing circuit subtracts a voltage at the second terminal from a voltage at the first terminal to obtain a differential voltage, which is then sampled and held as an input AC voltage sensing signal.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: November 3, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Siran Wang
  • Patent number: 10790737
    Abstract: A current threshold regulation method is used in a switching converter with a tank element and a transistor. The current threshold regulation method includes: detecting whether the input voltage is lower than an input under voltage threshold and generating an input under voltage indication signal; detecting whether the output voltage is lower than an output under voltage threshold and generating an output under voltage indication signal; generating a current threshold based on the input under voltage indication signal and output under voltage indication signal; comparing a current flowing though the tank element with the current threshold and generating a current comparison signal; and generating a control signal based on the current comparison signal to control the transistor.
    Type: Grant
    Filed: April 10, 2019
    Date of Patent: September 29, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Suhua Luo, Qian Ouyang, Wei Yuan, Pengpeng Ma
  • Patent number: 10784791
    Abstract: A driving circuit and driving method for driving a synchronous rectifier. When a drain-source detecting voltage between a drain terminal and a source terminal of the synchronous rectifier reaches a second reference voltage, the driving voltage applied at a gate terminal of the synchronous rectifier is decreased to regulate the drain-source detecting voltage to a first reference voltage. The first reference voltage is lower than the second reference voltage. And when the drain-source detecting voltage reaches an off reference voltage, the synchronous rectifier is turned off.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: September 22, 2020
    Assignee: Chengdu Monolithic Power SYstems Co., Ltd.
    Inventors: Lin Feng, Jiayou Ye
  • Patent number: 10763752
    Abstract: A method of controlling a flyback circuit and control circuit thereof. The flyback circuit has a transformer having a primary winding and an auxiliary winding, and the primary winding and the auxiliary winding have opposite dot orientations with each other. During a switching cycle, a primary switch coupled to the primary winding is turned off; then, an auxiliary switch coupled to the auxiliary winding is turned on when, after an elapse of a predetermined waiting time counted from a predetermined moment in an immediate preceding switching cycle, an auxiliary switch voltage signal decreases to a valley of the auxiliary switch voltage signal. The auxiliary switch is turned off when the auxiliary switch current signal increases to a reference current. The primary switch is turned on when a primary switch voltage signal decreases to a valley of the primary switch voltage signal.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: September 1, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Yancun Li
  • Patent number: 10756621
    Abstract: A voltage regulator provides an output voltage and an output current. The output voltage decreases with an increase of the output current when the output current is lower than a current breaking point, and the output voltage is maintained when the output current reaches the current breaking point.
    Type: Grant
    Filed: April 19, 2019
    Date of Patent: August 25, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Binci Xu, Yongliang Wang, Tao Zhao, Lijie Jiang
  • Patent number: 10727742
    Abstract: A power converter including a load transient enhancing module and associated method for improving load transient response of the power converter. The load transient enhancing module detects whether load transient is occurring in a load of the power converter, and turns the secondary switch off and locks the secondary switch at “OFF” state to turn on a body diode of the secondary switch once load transient is occurring in the load.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: July 28, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Changjiang Chen, Lei Li
  • Patent number: 10715044
    Abstract: A control circuit of a power converter providing at least a first output voltage and a second output voltage, having: a first loop control circuit, configured to provide a first error amplifying signal based on the first output voltage and a first reference voltage; a second loop control circuit, configured to provide a second error amplifying signal based on the second output voltage and a second reference voltage; a saturation detecting circuit, configured to provide a saturation indicating signal based on the first error amplifying signal and a saturation reference signal; and a first current source circuit, configured to charge an output terminal of the second error amplifier based on the saturation indicating signal.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: July 14, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Bairen Liu, Shufa Jiang, Bo Yu
  • Patent number: 10673344
    Abstract: A switching power supply circuit with synchronous rectifier has an energy storage component, a rectifier switch coupled to a secondary side of the energy storage component, and a secondary side control circuit. The secondary side control circuit provides a driving signal to control the rectifier switch. When the drain-source voltage across the rectifier switch is less than a first threshold value, the secondary side control circuit controls the driving signal to be a maximum voltage to control the rectifier switch being fully on for a predetermined duration. After a predetermined duration, the secondary side control circuit adjusts the voltage of the driving signal based on the drain-source voltage across the rectifier switch and a second threshold value.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: June 2, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Siran Wang
  • Patent number: 10673268
    Abstract: A multiphase charging circuit includes a first phase having a first switch and a second phase having a second switch to provide a system voltage for a system load, a control method of the multiphase charging circuit includes: generating a plurality of feedback control signals with generating each of feedback control signal based on a corresponding feedback signal, a ramp signal, a corresponding reference signal and a current flowing through the first phase; selecting one of the plurality of feedback control signals as a first enable signal; generating a first control signal of the first switch based on the first enable signal and a first time period control signal; generating a second enable signal by shifting a pre-determined phase difference to the first control signal; and generating a second control signal of the second switch based on the second enable signal and a second time period control signal.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: June 2, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Min Xu
  • Patent number: 10673336
    Abstract: A DC-DC converter with droop regulation for better transient performance. The DC-DC converter includes a switching circuit, a comparison circuit and a logic control circuit. A differential voltage indicative of an output voltage of the switching circuit, and a droop voltage indicative of an output current of the switching circuit, are generated. A high-pass filtered signal is obtained by high-pass filtering the droop voltage. The comparison circuit responds to the differential voltage, a reference voltage and the high-pass filtered signal to generate a set signal. The logic control circuit generates a control signal based on the set signal to control the switching circuit.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: June 2, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Lijie Jiang, Xiaokang Wu, Binci Xu
  • Patent number: 10673331
    Abstract: A feedback block used with an isolated switching converter, having: a variable resistance circuit receiving a resistance control signal and having an equivalent resistance in proportional to a duty cycle of the resistance control signal; and a resistance control circuit, configured to provide the resistance control signal based on a load of the isolated switching converter; wherein the duty cycle of the resistance control signal varies in response to the load of the isolated switching converter.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: June 2, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Wenbin Lu, Lei Miao
  • Patent number: 10666272
    Abstract: A COT control circuit for DC-DC converter. The COT control circuit has a synchronizing signal generator, an on time generator and a frequency locking circuit. The synchronizing signal generator generates a synchronizing signal and a frequency-modulated signal. The on time generator receives an input voltage signal, an output voltage signal, an error signal and the frequency-modulated signal to generate an on time signal. The error signal is generated by the frequency locking circuit based on the on time signal and the synchronizing signal. The operation frequency of a steady state of the DC-DC converter is regulated through changing the value of the frequency-modulated signal.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: May 26, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Lei Li
  • Patent number: 10651721
    Abstract: A multi-phase converter has a plurality of switching circuits coupled in parallel and a control circuit. The control circuit provides a set signal to successively turn ON the switching circuits under power operation based on an output voltage, a reference signal and a nonlinear control signal. When a number of switching circuits under power operation decreases, the nonlinear control signal increases to a preset value from an initial value, and then the nonlinear control signal decreases to the initial value with a preset slew rate.
    Type: Grant
    Filed: June 26, 2019
    Date of Patent: May 12, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Xiaokang Wu, Lijie Jiang, Suhua Luo
  • Patent number: 10651738
    Abstract: A multi-mode circuit has a first switch, a second switch, a third switch and a fourth switch. A current sampling circuit applied to the buck-boost has a first sampling circuit, a second sampling circuit and a current processing circuit. The first sampling circuit generates a first sampling current by sampling the current flowing through the first switch, the second sampling circuit generates a second sampling current by sampling the current flowing through the second switch, and the current processing circuit generates a third sampling current based on the first sampling current and the second sampling current. An average value of the third sampling current of one cycle represents the output current of the multi-mode circuit.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: May 12, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Junyong Gong, Jian Zhang
  • Patent number: 10637256
    Abstract: A charging mode auto-detection module for a charging circuit and associated charging mode auto-detection method. The charging mode auto-detection module compatibly includes a voltage dividing charging mode, a BC1.2 mode, a SAMSUNG 1.2V/1.2V charging mode and a QC3.0 mode and can detect which of the charging modes is an adaptable charging mode to a needing to be charged device and generate an indication signal indicative of a required charging voltage by the needing to be charged device so that the charging circuit can regulate its bus voltage to the required charging voltage based on the indication signal.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: April 28, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Junyong Gong, Changjiang Chen, Jian Jiang
  • Patent number: 10622880
    Abstract: An isolated power supply circuit has a first reference ground, a second reference ground, a power source, a first receiving circuit, a second receiving circuit, a first inverter circuit, a second inverter circuit and an isolated conversion circuit. The first reference ground and the second reference ground are isolated from each other. The first receiving circuit is coupled to the first reference ground. The second receiving circuit is coupled to the second reference ground. The power source provides a first power signal for the first receiving circuit directly. The first inverter circuit and the second inverter circuit receive the first power signal and produce a first inverter signal and a second inverter signal. And the isolated conversion circuit outputs a second power signal to the second receiving circuit based on the first inverter signal and the second inverter signal.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: April 14, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Yike Li
  • Patent number: 10624172
    Abstract: A short protecting circuit for a LED (Light-emitting Diode) driver for powering a plurality of LED strings, having: a short comparing circuit, configured to provide a plurality of short fault indicating signals; a first logic circuit, configured to provide a short fault signal based on the plurality of short fault indicating signals to indicate a short fault condition; a timing circuit, configured to provide a short protecting enable signal; and a second logic circuit, configured to provide a plurality of short isolating signals; wherein the short isolating signals are blocked when an open fault signal is valid.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: April 14, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Bo Yu, Junxin Tan, Taofeng Li, Shufa Jiang, Li Yang
  • Patent number: 10620677
    Abstract: An autonomous power system has a voltage regulator which converts an input voltage to an output voltage according to a reference voltage. A control method for the power system: receiving a voltage identification code sent by a processor; providing an autonomous voltage identification code when the voltage identification sent by the processor keeps constant during a first preset duration, wherein the autonomous voltage identification code can be updated self-adaptively; providing a reference voltage according to a sum of the voltage identification code and the autonomous identification code; and adjusting the output voltage according to the reference voltage.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: April 14, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Reagan Luo, Qian Ouyang, Lijie Jiang, Marvin Ma, Xiaokang Wu
  • Patent number: 10615598
    Abstract: An electrical circuit has a first integrated AC switch circuit connecting a first load to an AC voltage when the first integrated AC switch circuit is ON and a second integrated AC switch circuit connecting a second load to the AC voltage when the second integrated AC switch circuit is ON. The first integrated AC switch circuit generates a first DC voltage across a first capacitor and provides a pulse signal. When a VCCE pin of the second integrated AC switch circuit is coupled to a reference ground, a second capacitor is charged by the second integrated AC switch circuit to provide a second DC voltage. And when the VCCE pin of the second integrated AC switch circuit is floating or pulls high, the second capacitor is charged by the pulse signal.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: April 7, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Jian Jiang, Pengjie Lai, Bo Zhou, Junyong Gong, Eric Yang