Patents by Inventor Chi-Chen Chung
Chi-Chen Chung 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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Patent number: 10992234Abstract: A circuit for controlling a power converter includes an SR switching device, a light load detection circuit generating a load detection signal in response to a conduction signal and an operation mode signal, and an SR driver generating a control signal having a value according to the load detection signal and provide the control signal to the SR switching device. A method of controlling a power converter includes generating a load detection signal in response to a conduction signal and an operation mode signal and generating a control signal having a value according to the load detection signal. The control signal has a first value when the load detection signal is asserted and has a second value when the load detection signal is de-asserted.Type: GrantFiled: January 23, 2018Date of Patent: April 27, 2021Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Sangcheol Moon, Jintae Kim, Chi-Chen Chung, Cheng-Sung Chen
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Patent number: 10608544Abstract: A Synchronous Rectifier (SR) controller circuit includes a dead time evaluation circuit, an offset voltage controller circuit, an off threshold control circuit, and a comparator circuit. The dead time evaluation circuit produces an indication of whether a measured dead time of an SR switching device is less than a target dead time. The offset voltage controller circuit determines an offset count using the indication, an offset voltage using the offset count, and high and low saturation indicators according to the offset count. The off threshold control circuit determines a threshold count using the high and low saturation indicators and an off threshold voltage using the threshold count. The comparator circuit determines whether a measured voltage of the SR switching device is greater than a virtual off threshold voltage, the virtual off threshold voltage corresponding to the off threshold voltage minus the offset voltage.Type: GrantFiled: September 19, 2018Date of Patent: March 31, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Sangcheol Moon, Hangseok Choi, Chi Chen Chung, Cheng-Sung Chen
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Publication number: 20190229634Abstract: A circuit for controlling a power converter includes an SR switching device, a light load detection circuit generating a load detection signal in response to a conduction signal and an operation mode signal, and an SR driver generating a control signal having a value according to the load detection signal and provide the control signal to the SR switching device. A method of controlling a power converter includes generating a load detection signal in response to a conduction signal and an operation mode signal and generating a control signal having a value according to the load detection signal. The control signal has a first value when the load detection signal is asserted and has a second value when the load detection signal is de-asserted.Type: ApplicationFiled: January 23, 2018Publication date: July 25, 2019Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Sangcheol MOON, Jintae KIM, Chi-Chen CHUNG, Cheng-Sung CHEN
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Publication number: 20190020283Abstract: A Synchronous Rectifier (SR) controller circuit includes a dead time evaluation circuit, an offset voltage controller circuit, an off threshold control circuit, and a comparator circuit. The dead time evaluation circuit produces an indication of whether a measured dead time of an SR switching device is less than a target dead time. The offset voltage controller circuit determines an offset count using the indication, an offset voltage using the offset count, and high and low saturation indicators according to the offset count. The off threshold control circuit determines a threshold count using the high and low saturation indicators and an off threshold voltage using the threshold count. The comparator circuit determines whether a measured voltage of the SR switching device is greater than a virtual off threshold voltage, the virtual off threshold voltage corresponding to the off threshold voltage minus the offset voltage.Type: ApplicationFiled: September 19, 2018Publication date: January 17, 2019Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Sangcheol MOON, Hangseok CHOI, Chi Chen CHUNG, Cheng-Sung CHEN
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Patent number: 10110137Abstract: A Synchronous Rectifier (SR) controller circuit includes a dead time evaluation circuit, an offset voltage controller circuit, an off threshold control circuit, and a comparator circuit. The dead time evaluation circuit produces an indication of whether a measured dead time of an SR switching device is less than a target dead time. The offset voltage controller circuit determines an offset count using the indication, an offset voltage using the offset count, and high and low saturation indicators according to the offset count. The off threshold control circuit determines a threshold count using the high and low saturation indicators and an off threshold voltage using the threshold count. The comparator circuit determines whether a measured voltage of the SR switching device is greater than a virtual off threshold voltage, the virtual off threshold voltage corresponding to the off threshold voltage minus the offset voltage.Type: GrantFiled: April 13, 2017Date of Patent: October 23, 2018Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Sangcheol Moon, Hangseok Choi, Chi Chen Chung, Cheng-Sung Chen
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Publication number: 20180301999Abstract: A Synchronous Rectifier (SR) controller circuit includes a dead time evaluation circuit, an offset voltage controller circuit, an off threshold control circuit, and a comparator circuit. The dead time evaluation circuit produces an indication of whether a measured dead time of an SR switching device is less than a target dead time. The offset voltage controller circuit determines an offset count using the indication, an offset voltage using the offset count, and high and low saturation indicators according to the offset count. The off threshold control circuit determines a threshold count using the high and low saturation indicators and an off threshold voltage using the threshold count. The comparator circuit determines whether a measured voltage of the SR switching device is greater than a virtual off threshold voltage, the virtual off threshold voltage corresponding to the off threshold voltage minus the offset voltage.Type: ApplicationFiled: April 13, 2017Publication date: October 18, 2018Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Sangcheol MOON, Hangseok CHOI, Chi Chen CHUNG, Cheng-Sung CHEN
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Patent number: 9401592Abstract: A discharge circuit for an electromagnetic interference (EMI) filter is provided. The discharge circuit includes a switch circuit, a control circuit, and a detection circuit. The switch circuit is coupled to an X-capacitor of the EMI filter. The control circuit is coupled to the switch circuit and configured to turn on the switch circuit in a predetermined period to provide a discharge path. The detection circuit is coupled to the discharge path. In the predetermined period, the detection circuit detects whether a cross point occurs between a discharge voltage signal on the discharge path and a reference voltage signal to generate a detection signal which is provided to the control circuit. When the detection circuit detects that the cross point does not occur, the control circuit continuously turns on the switch circuit according to the detection signal after the predetermined period has elapsed.Type: GrantFiled: November 26, 2014Date of Patent: July 26, 2016Assignee: FAIRCHILD (TAIWAN) CORPORATIONInventors: Yuan-Pu Lee, Chi-Chen Chung, Chen-Hua Chiu, Wei-Hsuan Huang
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Patent number: 9379616Abstract: A control circuit with deep burst mode for power converter according to the present invention comprises a load detection circuit and a PWM circuit. The load detection circuit generates a switching control signal in response to a feedback signal. The feedback signal is correlated to a load condition of the power converter. The PWM circuit generates a switching signal to regulate an output of the power converter in response to the switching control signal and the feedback signal. The control circuit performs a deep burst mode to switch the switching signal only one time during each deep burst period when the load condition of the power converter is a very light-load. Therefore, switching loss is reduced so that the power consumption of the power converter is also reduced.Type: GrantFiled: August 13, 2012Date of Patent: June 28, 2016Assignee: System General Corp.Inventors: Chi-Chen Chung, Wei-Hsuan Huang
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Patent number: 9337736Abstract: A controller with power saving for a power converter includes a delay circuit, a detection circuit, an output circuit, a counter circuit, a wake-up circuit and a PWM circuit. The delay circuit determines a delay time. The detection circuit activates the delay circuit whenever an output load of the power converter is lower than a light-load threshold. The output circuit generates a power-saving signal to cease a regulation of the power converter after the delay time ends. The regulation of the power converter is resumed once the output load increases during the regulation of the power converter is being ceased. The counter circuit coupled to the delay circuit is counted by the delay circuit to determine a sleep period. The output circuit generates the power-saving signal to cease the regulation of the power converter after the sleep period ends.Type: GrantFiled: March 6, 2013Date of Patent: May 10, 2016Assignee: SYSTEM GENERAL CORPORATIONInventors: Chi-Chen Chung, Wei-Hsuan Huang
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Patent number: 9306459Abstract: This invention provides a control circuit for burst switching of a power converter comprising: an adaptive circuit generating an adaptive threshold in response to a feedback signal correlated to an output load of the power converter; and a switching circuit generating a switching signal to switch a transformer of the power converter in accordance with the adaptive threshold and the feedback signal for regulating an output of the power converter.Type: GrantFiled: June 29, 2011Date of Patent: April 5, 2016Assignee: SYSTEM GENERAL CORPORATIONInventors: Ta-Yung Yang, Wei-Hsuan Huang, Chi-Chen Chung
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Publication number: 20150146331Abstract: A discharge circuit for an electromagnetic interference (EMI) filter is provided. The discharge circuit includes a switch circuit, a control circuit, and a detection circuit. The switch circuit is coupled to an X-capacitor of the EMI filter. The control circuit is coupled to the switch circuit and configured to turn on the switch circuit in a predetermined period to provide a discharge path. The detection circuit is coupled to the discharge path. In the predetermined period, the detection circuit detects whether a cross point occurs between a discharge voltage signal on the discharge path and a reference voltage signal to generate a detection signal which is provided to the control circuit. When the detection circuit detects that the cross point does not occur, the control circuit continuously turns on the switch circuit according to the detection signal after the predetermined period has elapsed.Type: ApplicationFiled: November 26, 2014Publication date: May 28, 2015Inventors: Yuan-Pu Lee, Chi-Chen Chung, Chen-Hua Chiu, Wei-Hsuan Huang
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Publication number: 20140043002Abstract: A control circuit with deep burst mode for power converter according to the present invention comprises a load detection circuit and a PWM circuit. The load detection circuit generates a switching control signal in response to a feedback signal. The feedback signal is correlated to a load condition of the power converter. The PWM circuit generates a switching signal to regulate an output of the power converter in response to the switching control signal and the feedback signal. The control circuit performs a deep burst mode to switch the switching signal only one time during each deep burst period when the load condition of the power converter is a very light-load. Therefore, switching loss is reduced so that the power consumption of the power converter is also reduced.Type: ApplicationFiled: August 13, 2012Publication date: February 13, 2014Applicant: SYSTEM GENERAL CORP.Inventors: CHI-CHEN CHUNG, WEI-HSUAN HUANG
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Publication number: 20130241509Abstract: The present invention proposes a controller with power saving for a power converter. The controller includes a delay circuit, a detection circuit, an output circuit, a counter circuit, a wake-up circuit and a PWM circuit. The delay circuit determines a delay time. The detection circuit activates the delay circuit whenever an output load of the power converter is lower than a light-load threshold. The output circuit generates a power-saving signal to cease a regulation of the power converter after the delay time ends. The regulation of the power converter is resumed once the output load increases during the regulation of the power converter is being ceased. The counter circuit coupled to the delay circuit is counted by the delay circuit to determine a sleep period. The output circuit generates the power-saving signal to cease the regulation of the power converter after the sleep period ends.Type: ApplicationFiled: March 6, 2013Publication date: September 19, 2013Applicant: SYSTEM GENERAL CORPORATIONInventors: Chi-Chen CHUNG, Wei-Hsuan HUANG
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Publication number: 20120206944Abstract: This invention provides a control circuit for burst switching of a power converter comprising: an adaptive circuit generating an adaptive threshold in response to a feedback signal correlated to an output load of the power converter; and a switching circuit generating a switching signal to switch a transformer of the power converter in accordance with the adaptive threshold and the feedback signal for regulating an output of the power converter.Type: ApplicationFiled: June 29, 2011Publication date: August 16, 2012Applicant: System General CorporationInventors: Ta-Yung Yang, Wei-Hsuan Huang, Chi-Chen Chung
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Publication number: 20080309302Abstract: The invention discloses DC-DC converters comprising an inductance, a pulse width modulator generating a pulse signal according to the voltage level of a transformed voltage output terminal, a load sensor sensing a load current, an adaptive enable signal generator generating a PMOS transistor enable signal and an NMOS transistor enable signal based on the pulse signal and the load current, and a power transistor set comprising at least one PMOS transistor and an NMOS transistor. The power transistor set is used in coupling the transformed voltage output terminal to an original DC voltage source or ground via the inductance. The conductance of the PMOS and NMOS transistors are controlled by the PMOS and NMOS transistor enable signals, respectively. The adaptive enable signal generator makes a first dead-time between the PMOS and NMOS transistor enable signals decreasing with increasing load current.Type: ApplicationFiled: December 27, 2007Publication date: December 18, 2008Applicant: INDUSTRIAL TECHNOLOGY RERSEARCH INSTITUTEInventors: Ke-Horng Chen, Hong-Wei Huang, Sy-Yen Kuo, Chi-Chen Chung
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Patent number: 7358805Abstract: A fully differential sensing apparatus and an input common mode feedback circuit are provided. The input common mode feedback circuit includes a common mode error amplifier and a plurality of adaptive conductance elements. Each adaptive conductance element behaves with a low impedance characteristic when its anode voltage is greater than its cathode voltage by a positive threshold voltage or, on the contrary, when the anode voltage of such an adaptive conductance element is lower than its cathode voltage by a negative threshold voltage, the adaptive element also behaves with a low impedance characteristic; otherwise the aforementioned adaptive conductance element behaves with a high impedance characteristic. The common mode error amplifier and a plurality of such adaptive conductance elements form a negative feedback loop to effectively maintain the input common voltage of a fully differential input amplifier, which can be used for a fully differential sensing apparatus.Type: GrantFiled: August 25, 2006Date of Patent: April 15, 2008Assignee: Industrial Technology Research InstituteInventors: Tim K. Shia, Chi-Chen Chung, Long-Xi Chang
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Publication number: 20070285166Abstract: A fully differential sensing apparatus and an input common mode feedback circuit are provided. The input common mode feedback circuit includes a common mode error amplifier and a plurality of adaptive conductance elements. Each adaptive conductance element behaves with a low impedance characteristic when its anode voltage is greater than its cathode voltage by a positive threshold voltage or, on the contrary, when the anode voltage of such an adaptive conductance element is lower than its cathode voltage by a negative threshold voltage, the adaptive element also behaves with a low impedance characteristic; otherwise the aforementioned adaptive conductance element behaves with a high impedance characteristic. The common mode error amplifier and a plurality of such adaptive conductance elements form a negative feedback loop to effectively maintain the input common voltage of a fully differential input amplifier, which can be used for a fully differential sensing apparatus.Type: ApplicationFiled: August 25, 2006Publication date: December 13, 2007Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Tim K. SHIA, Chi-Chen Chung, Long-Xi Chang
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Patent number: 5293759Abstract: An absorption refrigeration system uses a solution and a refrigerant contained in the solution as working mediums.Type: GrantFiled: July 15, 1992Date of Patent: March 15, 1994Assignee: Industrial Technology research InstituteInventors: Chung-Chiang Lee, Hung-Yao Chao, Peggy Lin, Chi-Chen Chung, Yuh-Yuan Yo