Patents Assigned to Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
  • Patent number: 9991787
    Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: June 5, 2018
    Assignee: SHANGHAI SIM-BCD SEMICONDUCTOR MANUFACTURING CO., Ltd.
    Inventors: Meiling Zhang, Xiaoru Gao, Chao Chen, Yajiang Zhu
  • Patent number: 9893626
    Abstract: A switch mode power supply (SMPS) has a primary-side controller configured to control a power switch for turning on and turning off a current flow in the primary winding. A secondary-side controller is coupled to the secondary winding for providing constant voltage (CV) and constant current (CC) control of the SMPS. The secondary-side controller is configured to receive an output selection signal and, based on the output selection signal, select a voltage reference signal from a plurality of voltage reference signals and select a current reference signal from a plurality of current reference signals. The secondary-side controller is configured to monitor an output voltage and an output current of the SMPS, and is configured to provide a turn-on signal to the primary-side controller for turning on the power switch upon determining that the output voltage is below the selected voltage reference signal and the output current is below the selected current reference signal.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: February 13, 2018
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Hu Wang, Yajiang Zhu, Chao Gao, Yawei Tang
  • Patent number: 9831763
    Abstract: A discharging circuit for a power supply includes a rectifying circuit for coupling to an input filter capacitor coupled to an AC input voltage for providing a rectified AC voltage. A discharge resistor is coupled to the rectifying circuit, and a power switch and a discharging current source are coupled in series with the discharging resistor. A discharge control circuit is coupled to the discharge resistor for providing a discharge signal to cause the power switch to turn on for discharging the capacitor using the discharging current source. The discharging control circuit includes an AC voltage sampling circuit for providing a sampled rectified voltage, a signal-shaping circuit for providing a time-varying signal derived from the sampled rectified voltage, a comparator circuit for comparing the sampled rectified voltage and the time-varying signal, and a counter circuit for providing the discharge signal in response to an output of the comparator circuit.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: November 28, 2017
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: An Dong Zhao, Zheng Ying
  • Patent number: 9748834
    Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: August 29, 2017
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Meiling Zhang, Xiaoru Gao, Chao Chen, Yajiang Zhu
  • Patent number: 9596725
    Abstract: A switch mode power supply (SMPS) includes a buck converter circuit that includes a first inductor coupled to an output terminal and a switch device coupled the first inductor. A controller is configured for regulating the output current based at least in part on controlling a peak current in the first inductor according to a ratio between an instantaneous voltage to an average voltage at the negative output terminal. The controller is configured to cause the SMPS to operate in a boundary conduction mode (BCM). The controller is configured to maintain a constant average output current that is substantially independent of the input voltage and the output voltage, and also provide a high power factor.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: March 14, 2017
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Zhimin Hu, Qun Li, Lei Cheng, Junelei Li
  • Patent number: 9431895
    Abstract: An SMPS received a rectified periodic input line voltage and is configure to provide a regulated output. A power switch has a constant turn-on time in a given cycle of the rectified periodic input line voltage. A maximum value of the envelope of peak currents through the power switch is determined and is compared with a reference value, and the power switch turn-on time in the next cycle is adjusted accordingly. The output of the power supply is regulated to a target output value, and the current is in phase with the periodic input line voltage, resulting in a high power factor. No sampling of the line voltage is needed to maintain the high power factor. A controller chip can have as few as five pins. Alternatively, a seven-pin controller chip can have two external resistors for selecting operations in either Boundary Conduction Mode (BCM) or Discontinuous Conduction Mode (DCM).
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: August 30, 2016
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Na Liu, Zeqiang Chen, Yajiang Zhu, Jianhua Duan, Chao Deng, Zhimin Hu, Siyuan Xu
  • Patent number: 9293981
    Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: March 22, 2016
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Meiling Zhang, Xiaoru Gao, Chao Chen, Yajiang Zhu
  • Patent number: 9196318
    Abstract: A voltage reference circuit includes a first enhancement-mode PMOS transistor, a first enhancement mode NMOS transistor, and a first depletion-mode PMOS transistor coupled in series between a voltage supply and a ground. A second depletion-mode PMOS transistor is coupled to the first enhancement PMOS transistor to form a feedback circuit. A first resistive device is coupled between the voltage supply and the second depletion-mode PMOS transistor, and a second resistive device is coupled between the second depletion-mode PMOS transistor and the ground. A bias circuit is coupled to a gate of the first enhancement-mode NMOS transistor. The first enhancement-mode PMOS transistor and the first depletion-mode PMOS transistor are configured to operate in saturation region. A first reference voltage across the first resistor and a second reference voltage across the second resistor are configured to be independent of the magnitude of the voltage supply and have low temperature drift.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: November 24, 2015
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing CO., LTd.
    Inventors: Shaohua Peng, Zutao Liu
  • Publication number: 20140239930
    Abstract: A control circuit is provided for a buck converter that includes at least an inductor coupled to an output of the buck converter. The control circuit includes a power switch configured for coupling to a line voltage and configured for charging the inductor, an input line voltage sampling circuit, and a constant-voltage (CV) and constant-current (CC) control module coupled to the power switch. During a charging period of the inductor, the CV and CC control module is configured to control the power switch to provide a constant output current by maintaining a constant peak inductor current, even when the input line voltage changes. During a discharging period of the inductor, the CV and CC control module is configured to monitor the sensed output voltage to control the power switch to provide a constant output voltage.
    Type: Application
    Filed: September 20, 2013
    Publication date: August 28, 2014
    Applicant: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: Hu Wang, Yajiang Zhu, Ruixia Fei, Shuzhuang Lv
  • Publication number: 20140104964
    Abstract: A voltage reference circuit includes a first enhancement-mode PMOS transistor, a first enhancement mode NMOS transistor, and a first depletion-mode PMOS transistor coupled in series between a voltage supply and a ground. A second depletion-mode PMOS transistor is coupled to the first enhancement PMOS transistor to form a feedback circuit. A first resistive device is coupled between the voltage supply and the second depletion-mode PMOS transistor, and a second resistive device is coupled between the second depletion-mode PMOS transistor and the ground. A bias circuit is coupled to a gate of the first enhancement-mode NMOS transistor. The first enhancement-mode PMOS transistor and the first depletion-mode PMOS transistor are configured to operate in saturation region. A first reference voltage across the first resistor and a second reference voltage across the second resistor are configured to be independent of the magnitude of the voltage supply and have low temperature drift.
    Type: Application
    Filed: October 11, 2013
    Publication date: April 17, 2014
    Applicant: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: SHAOHUA PENG, Zutao Liu
  • Patent number: 8665572
    Abstract: The present invention relates to a battery charge/discharge protection circuit that protects an associated battery from charge/discharge damage. The charge/discharge protection circuit includes a first terminal, a second terminal, a charge over-current detection circuit, a discharge over-current detection circuit, a short circuit detection circuit, and a PMOS transistor. A drain electrode and a gate electrode of the PMOS transistor are connected to the first terminal and the second terminal respectively. A source electrode of the PMOS transistor is connected to the charge over-current detection circuit, the discharge over-current detection circuit and the short circuit detection circuit, such that when a voltage above an overvoltage threshold is supported by the charger, the voltage of the source electrode of the PMOS transistor is maintained above a negative threshold voltage and the elements in these circuits do not receive such a voltage output by the charger.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: March 4, 2014
    Assignee: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventor: Zutao Liu
  • Publication number: 20130343101
    Abstract: A control circuit for a switch mode power supply (SMPS) includes a power switch for coupling to a primary winding of the power supply and a startup resistor coupled to an external input voltage and to a control terminal of the power switch. The control circuit also includes a controller. During startup, the controller is configured to cause the power switch to amplify a startup current from an external input voltage through the startup resistor and provide a startup power to the controller. During normal operation, the controller is configured to provide a power switch control signal to turn on and off the power switch for controlling a current flow in the primary winding and regulating an output of the power supply. The controller is configured to provide a current signal for driving an NPN power switch and to provide a voltage signal for driving an NMOS power switch.
    Type: Application
    Filed: August 28, 2013
    Publication date: December 26, 2013
    Applicant: Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
    Inventors: MEILING ZHANG, Xiaoru Gao, Chao Chen