Patents by Inventor Zhao-Jun Wang
Zhao-Jun Wang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20090268362Abstract: A power supply controller method and apparatus measuring impedance is disclosed. An apparatus according to aspects of the present invention includes a sense circuit coupled to a sense terminal. A regulation circuit coupled to the sense circuit and coupled to regulate the sense terminal to a first voltage level when a current flowing through the sense terminal is less than a first threshold current level. The regulation circuit is further coupled to regulate the sense terminal to a second voltage level when the current flowing through the sense terminal reaches the first threshold current level. A response circuit is coupled to the sense circuit and is responsive to the current flowing through the sense terminal when the sense terminal is regulated at the second voltage level.Type: ApplicationFiled: July 2, 2009Publication date: October 29, 2009Applicant: POWER INTEGRATIONS, INC.Inventors: Zhao-Jun Wang, Stefan Baurle, David Michael Hugh Matthews
-
Patent number: 7576528Abstract: A power supply controller measuring impedance includes a sense circuit coupled to a sense terminal. A regulation circuit is coupled to the sense circuit and is also coupled to regulate the sense terminal to a first voltage level when a current flowing through the sense terminal is less than a first threshold current level. The regulation circuit is further coupled to regulate the sense terminal to a second voltage level when the current flowing through the sense terminal reaches the first threshold current level. A response circuit is coupled to the sense circuit and is responsive to the current flowing through the sense terminal when the sense terminal is regulated at the second voltage level.Type: GrantFiled: October 4, 2006Date of Patent: August 18, 2009Assignee: Power Integrations, Inc.Inventors: Zhao-Jun Wang, Stefan Bäurle, David Michael Hugh Matthews
-
Publication number: 20090189682Abstract: A method is disclosed to add functionality to a terminal of a high voltage integrated circuit without the penalty of additional high voltage circuitry. The benefit is that alternative modes of operation can be selected for testing, trimming parameters of the integrated circuit, or any other purpose without the cost of an additional terminal. In one embodiment, ordinary low voltage circuitry monitors the voltage on the terminal that normally is exposed to high voltage. The configuration of a simple voltage detector and an ordinary latch allows easy entry into the test and trimming mode when the integrated circuit is not in the intended application, but prohibits entry into the test and trimming mode when the integrated circuit operates in the intended application.Type: ApplicationFiled: March 30, 2009Publication date: July 30, 2009Applicant: POWER INTEGRATIONS, INC.Inventors: Alex B. Djenguerian, William B. Smith, Kent Wong, Zhao-Jun Wang
-
Publication number: 20090175058Abstract: An apparatus and method of switching a switch of a power supply in response to an input voltage signal are disclosed. According to aspects of the present invention, a power supply controller includes a switch duty cycle controller coupled to receive a feedback signal and a duty cycle adjust signal. The switch duty cycle controller is coupled to generate a drive signal coupled to control switching of a switch, which is coupled to an energy transfer element, to regulate energy delivered from an input of a power supply to an output of the power supply. The power supply controller also includes a gain selector circuit coupled to receive an input voltage signal, which is representative of an input voltage to the power supply, to generate the duty cycle adjust signal received by the switch duty cycle controller. The maximum duty cycle of the drive signal to be varied in response to a plurality of linear functions over a range of values of the input voltage signal.Type: ApplicationFiled: February 11, 2009Publication date: July 9, 2009Applicant: POWER INTEGRATIONS, INC.Inventors: Stefan Baurle, Zhao-Jun Wang
-
Patent number: 7554315Abstract: A circuit includes a current divider to divide a current from a current source into a first current and a reference current. The circuit also includes a current mirror coupled to the current divider to receive the first current from the current divider and to receive an adjustment current. The adjustment current is to set the reference current.Type: GrantFiled: June 6, 2008Date of Patent: June 30, 2009Assignee: Power Integrations, Inc.Inventor: Zhao-Jun Wang
-
Patent number: 7535130Abstract: A method is disclosed to add functionality to a terminal of a high voltage integrated circuit without the penalty of additional high voltage circuitry. The benefit is that alternative modes of operation can be selected for testing, trimming parameters of the integrated circuit, or any other purpose without the cost of an additional terminal. In one embodiment, ordinary low voltage circuitry monitors the voltage on the terminal that normally is exposed to high voltage. The configuration of a simple voltage detector and an ordinary latch allows easy entry into the test and trimming mode when the integrated circuit is not in the intended application, but prohibits entry into the test and trimming mode when the integrated circuit operates in the intended application.Type: GrantFiled: May 12, 2008Date of Patent: May 19, 2009Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, William B. Smith, Zhao-Jun Wang, Kent Wong
-
Patent number: 7502236Abstract: An apparatus and method of switching a switch of a power supply in response to an input voltage signal are disclosed. According to aspects of the present invention, a power supply controller includes a switch duty cycle controller coupled to receive a feedback signal and a duty cycle adjust signal. The switch duty cycle controller is coupled to generate a drive signal coupled to control switching of a switch, which is coupled to an energy transfer element, to regulate energy delivered from an input of a power supply to an output of the power supply. The power supply controller also includes a gain selector circuit coupled to receive an input voltage signal, which is representative of an input voltage to the power supply, to generate the duty cycle adjust signal received by the switch duty cycle controller. The maximum duty cycle of the drive signal to be varied in response to a plurality of linear functions over a range of values of the input voltage signal.Type: GrantFiled: October 4, 2006Date of Patent: March 10, 2009Assignee: Power Integrations, Inc.Inventors: Stefan Bäurle, Zhao-Jun Wang
-
Publication number: 20080238401Abstract: A circuit includes a current divider to divide a current from a current source into a first current and a reference current. The circuit also includes a current mirror coupled to the current divider to receive the first current from the current divider and to receive an adjustment current. The adjustment current is to set the reference current.Type: ApplicationFiled: June 6, 2008Publication date: October 2, 2008Applicant: Power Integrations, Inc.Inventor: Zhao-Jun Wang
-
Publication number: 20080218001Abstract: A method is disclosed to add functionality to a terminal of a high voltage integrated circuit without the penalty of additional high voltage circuitry. The benefit is that alternative modes of operation can be selected for testing, trimming parameters of the integrated circuit, or any other purpose without the cost of an additional terminal. In one embodiment, ordinary low voltage circuitry monitors the voltage on the terminal that normally is exposed to high voltage. The configuration of a simple voltage detector and an ordinary latch allows easy entry into the test and trimming mode when the integrated circuit is not in the intended application, but prohibits entry into the test and trimming mode when the integrated circuit operates in the intended application.Type: ApplicationFiled: May 12, 2008Publication date: September 11, 2008Applicant: POWER INTEGRATIONS, INC.Inventors: Alex B. Djenguerian, William B. Smith, Kent Wong, Zhao-Jun Wang
-
Patent number: 7397231Abstract: Examples of a method and apparatus for adjusting a reference. One circuit includes a current divider to divide a current from a current source into a first current and a reference current. The circuit also includes a current mirror coupled to the current divider to receive the first current from the current divider and to receive an adjustment current. The adjustment current is to set the reference current such that the reference current is adjustable between a full value and a fraction of the full value in response to the adjustment current. A change in the reference current and a change in the adjustment current are proportional when the adjustment current is between an upper and a lower threshold value.Type: GrantFiled: July 25, 2006Date of Patent: July 8, 2008Assignee: Power Integrations, Inc.Inventor: Zhao-Jun Wang
-
Patent number: 7385312Abstract: A method is disclosed to add functionality to a terminal of a high voltage integrated circuit without the penalty of additional high voltage circuitry. The benefit is that alternative modes of operation can be selected for testing, trimming parameters of the integrated circuit, or any other purpose without the cost of an additional terminal. In one embodiment, ordinary low voltage circuitry monitors the voltage on the terminal that normally is exposed to high voltage. The configuration of a simple voltage detector and an ordinary latch allows easy entry into the test and trimming mode when the integrated circuit is not in the intended application, but prohibits entry into the test and trimming mode when the integrated circuit operates in the intended application.Type: GrantFiled: September 26, 2006Date of Patent: June 10, 2008Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, William B. Smith, Kent Wong, Zhao-Jun Wang
-
Publication number: 20080084234Abstract: An apparatus and method of providing a pulse width modulated signal that is responsive to a current are disclosed. A circuit according to aspects of the present invention includes a capacitor to convert a first current to a first voltage on the capacitor during a first time duration and to discharge a second current from the capacitor to change the first voltage to a second voltage during a second time duration. A comparator is also included and is coupled to an output of the capacitor to compare a voltage on the capacitor to a reference voltage during the second time duration to change a pulse width of a periodic output signal in response to an input current.Type: ApplicationFiled: October 4, 2006Publication date: April 10, 2008Inventor: Zhao-Jun Wang
-
Publication number: 20080084712Abstract: A power supply controller method and apparatus measuring impedance is disclosed. An apparatus according to aspects of the present invention includes a sense circuit coupled to a sense terminal. A regulation circuit coupled to the sense circuit and coupled to regulate the sense terminal to a first voltage level when a current flowing through the sense terminal is less than a first threshold current level. The regulation circuit is further coupled to regulate the sense terminal to a second voltage level when the current flowing through the sense terminal reaches the first threshold current level. A response circuit is coupled to the sense circuit and is responsive to the current flowing through the sense terminal when the sense terminal is regulated at the second voltage level.Type: ApplicationFiled: October 4, 2006Publication date: April 10, 2008Inventors: Zhao-Jun Wang, Stefan Baurle, David Michael Hugh Matthews
-
Publication number: 20080084198Abstract: An apparatus and method of switching a switch of a power supply in response to an input voltage signal are disclosed. According to aspects of the present invention, a power supply controller includes a switch duty cycle controller coupled to receive a feedback signal and a duty cycle adjust signal. The switch duty cycle controller is coupled to generate a drive signal coupled to control switching of a switch, which is coupled to an energy transfer element, to regulate energy delivered from an input of a power supply to an output of the power supply. The power supply controller also includes a gain selector circuit coupled to receive an input voltage signal, which is representative of an input voltage to the power supply, to generate the duty cycle adjust signal received by the switch duty cycle controller. The maximum duty cycle of the drive signal to be varied in response to a plurality of linear functions over a range of values of the input voltage signal.Type: ApplicationFiled: October 4, 2006Publication date: April 10, 2008Inventors: Stefan Baurle, Zhao-Jun Wang
-
Publication number: 20080024105Abstract: Examples of a method and apparatus for adjusting a reference are disclosed. In one aspect of the invention, a circuit includes a current divider to divide a current from a current source into a first current and a reference current. The circuit also includes a current mirror coupled to the current divider to receive the first current from the current divider and to receive an adjustment current. The adjustment current is to set the reference current.Type: ApplicationFiled: July 25, 2006Publication date: January 31, 2008Inventor: Zhao-Jun Wang
-
Publication number: 20070018508Abstract: A method is disclosed to add functionality to a terminal of a high voltage integrated circuit without the penalty of additional high voltage circuitry. The benefit is that alternative modes of operation can be selected for testing, trimming parameters of the integrated circuit, or any other purpose without the cost of an additional terminal. In one embodiment, ordinary low voltage circuitry monitors the voltage on the terminal that normally is exposed to high voltage. The configuration of a simple voltage detector and an ordinary latch allows easy entry into the test and trimming mode when the integrated circuit is not in the intended application, but prohibits entry into the test and trimming mode when the integrated circuit operates in the intended application.Type: ApplicationFiled: September 26, 2006Publication date: January 25, 2007Inventors: Alex Djenguerian, William Smith, Kent Wong, Zhao-Jun Wang
-
Patent number: 7157813Abstract: A method is disclosed to add functionality to a terminal of a high voltage integrated circuit without the penalty of additional high voltage circuitry. The benefit is that alternative modes of operation can be selected for testing, trimming parameters of the integrated circuit, or any other purpose without the cost of an additional terminal. In one embodiment, ordinary low voltage circuitry monitors the voltage on the terminal that normally is exposed to high voltage. The configuration of a simple voltage detector and an ordinary latch allows easy entry into the test and trimming mode when the integrated circuit is not in the intended application, but prohibits entry into the test and trimming mode when the integrated circuit operates in the intended application.Type: GrantFiled: October 3, 2003Date of Patent: January 2, 2007Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, William B. Smith, Kent Wong, Zhao-Jun Wang
-
Publication number: 20050073785Abstract: A method is disclosed to add functionality to a terminal of a high voltage integrated circuit without the penalty of additional high voltage circuitry. The benefit is that alternative modes of operation can be selected for testing, trimming parameters of the integrated circuit, or any other purpose without the cost of an additional terminal. In one embodiment, ordinary low voltage circuitry monitors the voltage on the terminal that normally is exposed to high voltage. The configuration of a simple voltage detector and an ordinary latch allows easy entry into the test and trimming mode when the integrated circuit is not in the intended application, but prohibits entry into the test and trimming mode when the integrated circuit operates in the intended application.Type: ApplicationFiled: October 3, 2003Publication date: April 7, 2005Inventors: Alex Djenguerian, William Smith, Kent Wong, Zhao-Jun Wang