Patents by Inventor David Kung
David Kung 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).
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Publication number: 20130083565Abstract: An example controller for a power converter includes a feedback sampling circuit, drive logic and a false sampling prevention circuit. The feedback sampling circuit is coupled to sample a feedback signal received from a terminal of the controller and to generate a sample signal representative of a value of the feedback signal. The drive logic is coupled to the feedback sampling circuit and coupled to control the power switch to regulate an output of the power converter in response to the sample signal. The false sampling prevention circuit is coupled to receive a sampling complete signal that indicates when the sampling of the feedback signal is complete. The false sampling prevention circuit is further coupled to the drive logic to extend the off time of the power switch until the sampling complete signal indicates that the sampling of the feedback signal by the feedback sampling circuit is complete.Type: ApplicationFiled: September 29, 2011Publication date: April 4, 2013Applicant: POWER INTEGRATIONS, INC.Inventors: Yury Gaknoki, David Kung
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Publication number: 20130080197Abstract: Various embodiments of systems and methods for evaluating a trust value for a report are disclosed herein. The method includes obtaining (110) one or more reports 270 by the computer 260, where the reports 270 are formed of one or more fields of data. An end-to-end lineage for the data is determined to trace the data back to the data source system 210, 211, and/or 212 from which the data had originated initially. Further, the method includes validating each of the multiple data source systems 210, 211, and 212 including intermediate tables, and determining (130) a data quality score for each of the multiple data source systems 210, 211, and 212. A trust value for the report 270 is calculated (140) based on the data quality scores for the one or more data source systems 210, 211, and 212 and intermediate tables, and rendered along with the report.Type: ApplicationFiled: September 22, 2011Publication date: March 28, 2013Inventors: DAVID KUNG, Marc Maillart, Suryanarayana Mangipudi, Aun-Khuan Tan
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Publication number: 20120326697Abstract: A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.Type: ApplicationFiled: September 6, 2012Publication date: December 27, 2012Applicant: POWER INTEGRATIONS, INC.Inventors: David Kung, Leif Lund
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Patent number: 8325505Abstract: An example power supply includes an energy transfer element, a switch and a controller. The controller includes a logic circuit and a constant current control circuit. The logic circuit generates a drive signal to control the switch in response to a control signal. The constant current control circuit generates the control signal in response to a received input current sense signal, input voltage sense signal, and output voltage sense signal. An integrator included in the constant current control circuit integrates the input current sense signal to generate an integrated signal representative of a charge taken from the input voltage source. The constant current control circuit is adapted to generate the control signal to provide a constant current at the output of the power supply such that the integrated signal is proportional to a ratio of the output voltage sense signal to the input voltage sense signal.Type: GrantFiled: February 21, 2012Date of Patent: December 4, 2012Assignee: Power Integrations, Inc.Inventors: David Kung, William M. Polivka
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Patent number: 8299772Abstract: An example circuit includes a regulator circuit coupled to first and second nodes. A capacitance circuit and a slew rate control circuit are coupled between the first and second nodes. The regulator circuit is coupled to charge a capacitance of the capacitance circuit with a charge current. The slew rate control circuit is coupled to control a change in voltage over change in time between the first and second nodes during a power up mode of the circuit. The slew rate control circuit further includes a switch and a resistor. The slew rate control circuit is coupled to switch the switch in response to a voltage between the first and second nodes. A voltage drop across the resistor is limited to a base-emitter voltage drop of a transistor coupled between the first and second nodes to set the change in voltage over change in time.Type: GrantFiled: October 13, 2011Date of Patent: October 30, 2012Assignee: Power Integrations, Inc.Inventors: David Kung, Leif Lund
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Patent number: 8278994Abstract: A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.Type: GrantFiled: February 16, 2012Date of Patent: October 2, 2012Assignee: Power Integrations, Inc.Inventors: David Kung, Leif Lund
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Patent number: 8209703Abstract: A computer readable storage medium includes executable instructions to assess system cache resources, inter-process communication requirements and staging requirements to divide an extract, transform, load (ETL) dataflow task into a plurality of sub-tasks. The sub-tasks are then executed in parallel on distributed resources.Type: GrantFiled: December 7, 2007Date of Patent: June 26, 2012Assignee: SAP France S.A.Inventors: Monfor Yee, Wu Cao, Hui Xu, Anil Kumar Samudrala, Balaji Gadhiraju, Kurinchi Kumaran, David Kung
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Publication number: 20120146607Abstract: An example power supply includes an energy transfer element, a switch and a controller. The controller includes a logic circuit and a constant current control circuit. The logic circuit generates a drive signal to control the switch in response to a control signal. The constant current control circuit generates the control signal in response to a received input current sense signal, input voltage sense signal, and output voltage sense signal. An integrator included in the constant current control circuit integrates the input current sense signal to generate an integrated signal representative of a charge taken from the input voltage source. The constant current control circuit is adapted to generate the control signal to provide a constant current at the output of the power supply such that the integrated signal is proportional to a ratio of the output voltage sense signal to the input voltage sense signal.Type: ApplicationFiled: February 21, 2012Publication date: June 14, 2012Applicant: POWER INTEGRATIONS, INC.Inventors: David Kung, William M. Polivka
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Publication number: 20120146715Abstract: A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.Type: ApplicationFiled: February 16, 2012Publication date: June 14, 2012Applicant: Power Integrations, Inc.Inventors: David Kung, Leif Lund
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Publication number: 20120105018Abstract: A switch is coupled to a control circuit and to an input of a power converter. The control circuit is coupled to drive the switch in a first operating mode to transfer energy from the input to an output of the power converter when an electrical energy source is coupled to the input of the power converter. The control circuit is coupled to drive the switch in a second operating mode when the electrical energy source is uncoupled from the input. A capacitance is coupled between input terminals of the input of the power converter and is discharged to a threshold voltage in less than a maximum period of time from when the electrical energy source is uncoupled from the input terminals. The control circuit is coupled to drive the switch to have a high average impedance in the first operating mode.Type: ApplicationFiled: January 6, 2012Publication date: May 3, 2012Applicant: POWER INTEGRATIONS, INC.Inventors: Balu Balakrishnan, David Kung, Raymond Kenneth Orr, David Michael Hugh Matthews
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Publication number: 20120068680Abstract: An example circuit includes a regulator circuit coupled to first and second nodes. A capacitance circuit and a slew rate control circuit are coupled between the first and second nodes. The regulator circuit is coupled to charge a capacitance of the capacitance circuit with a charge current. The slew rate control circuit is coupled to control a change in voltage over change in time between the first and second nodes during a power up mode of the circuit. The slew rate control circuit further includes a switch and a resistor. The slew rate control circuit is coupled to switch the switch in response to a voltage between the first and second nodes. A voltage drop across the resistor is limited to a base-emitter voltage drop of a transistor coupled between the first and second nodes to set the change in voltage over change in time.Type: ApplicationFiled: October 13, 2011Publication date: March 22, 2012Applicant: POWER INTEGRATIONS, INC.Inventors: David Kung, Leif Lund
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Patent number: 8139384Abstract: An example controller includes a constant current control circuit and an integrator included in the constant current control circuit. The constant current control circuit is to be coupled to receive an input current sense signal, an input voltage sense signal, and an output voltage sense signal. The control circuit is adapted to regulate an output current of a power supply by generating a control signal to control switching of a switch. The integrator is coupled to integrate the input current sense signal during a switching period of the control signal to generate an integrated signal representative of a charge taken from an input voltage source of the power supply. The constant current control circuit is adapted to control the switching of the switch such that the integrated signal is proportional to a ratio of the output voltage sense signal to the input voltage sense signal.Type: GrantFiled: June 2, 2009Date of Patent: March 20, 2012Assignee: Power Integrations, Inc.Inventors: David Kung, William M. Polivka
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Patent number: 8125265Abstract: A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.Type: GrantFiled: August 15, 2011Date of Patent: February 28, 2012Assignee: Power Integrations, Inc.Inventors: David Kung, Leif Lund
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Patent number: 8115457Abstract: A circuit to discharge a capacitance between input terminals of a power system is disclosed. An example circuit includes a control circuit coupled to an input of a power system. The control circuit is coupled to detect whether an electrical energy source is coupled to an input of the power system. A switch is also included and is coupled to the control circuit and to the input of the power system. The control circuit is coupled to drive the switch in a first operating mode when the electrical energy source is coupled to the input of the power system. The control circuit is coupled to drive the switch in a second operating mode when the electrical energy source is uncoupled from the input of the power system. A capacitance coupled between input terminals of the input of the power system is discharged through the switch to a threshold voltage in less than a maximum period of time from when the electrical power source is uncoupled from the input terminals of the power system.Type: GrantFiled: July 31, 2009Date of Patent: February 14, 2012Assignee: Power Integrations, Inc.Inventors: Balu Balakrishnan, David Kung, Raymond Kenneth Orr, David Michael Hugh Matthews
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Publication number: 20110298529Abstract: A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.Type: ApplicationFiled: August 15, 2011Publication date: December 8, 2011Applicant: Power Integrations, Inc.Inventors: David Kung, Leif Lund
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Patent number: 8063622Abstract: A circuit to control the slew rate of charging a capacitance using the capacitance is disclosed. An example circuit includes a regulator circuit to regulate a supply voltage during a normal operation mode of the circuit. A capacitance circuit is coupled to the regulator circuit. The regulator circuit is coupled to charge a capacitance between a first node and a second node of the capacitance circuit with a charge current. A slew rate control circuit is coupled to the regulator circuit and the capacitance circuit. The slew rate control circuit sets a slew rate of a voltage between the first and second nodes during a power up mode of the circuit.Type: GrantFiled: October 2, 2009Date of Patent: November 22, 2011Assignee: Power Integrations, Inc.Inventors: David Kung, Leif Lund
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Patent number: 7999606Abstract: A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.Type: GrantFiled: January 31, 2011Date of Patent: August 16, 2011Assignee: Power Intergrations, Inc.Inventors: David Kung, Leif Lund
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Publication number: 20110145005Abstract: A system and method for automatic business content discovery are described. In various embodiments, a system includes modules to bind business terms to data validation rules and search data sources for data matching data validation rules. In various embodiments, the system binds matching data to data validation rules. In various embodiments, a user interface is provided for creating and managing business terms and data validation rules. In various embodiments, a method for profiling and monitoring data via graphical controls is presented.Type: ApplicationFiled: December 10, 2009Publication date: June 16, 2011Inventors: Wu Cao, Balaji Gadhiraju, Sridhar Gantimahapatruni, David Kung, Marc Maillart, Awez Syed, Aun-Khuan Tan
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Publication number: 20110121889Abstract: A temperature independent reference circuit includes first and second bipolar transistors with commonly coupled bases. First and second resistors are coupled in series between the emitter of the second bipolar transistor and ground. The first and second resistors have first and second resistance values, R1 and R2, and third and second temperature coefficients, TC3 and TC2, respectively. The resistance values being such that a temperature coefficient of a difference between the base-emitter voltages of the first and second bipolar transistors, TC1, is substantially equal to TC2×(R2/(R1+R2))+TC3×(R1/(R1+R2)), resulting in a reference current flowing through each of the first and second bipolar transistors that is substantially constant over temperature. A third resistor coupled between a node and the collector of the second bipolar transistor has a value such that a reference voltage generated at the node is substantially constant over temperature.Type: ApplicationFiled: January 31, 2011Publication date: May 26, 2011Applicant: Power Integrations, Inc.Inventors: David Kung, Leif Lund
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Publication number: 20110080761Abstract: An integrated circuit (IC) comprises a rectifier/regulator circuit coupled to receive an ac source voltage and output a regulated dc voltage. The rectifier/regulator circuit includes first and second switching elements that provide charging current when enabled. The first and second switching elements do not provide charging current when disabled. A sensor circuit is coupled to sense the regulated dc voltage and generate a feedback control signal coupled to the rectifier/regulator circuit that enables the first and second switching elements when the regulated dc voltage is above a target voltage, and disables the first and second switching elements when the regulated dc voltage is below the target voltage.Type: ApplicationFiled: October 6, 2009Publication date: April 7, 2011Applicant: Power Integrations, Inc.Inventor: David Kung