Patents by Inventor Chih-Hsien HSIEH
Chih-Hsien HSIEH 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: 10027165Abstract: An electrical circuit for a power supply includes a primary-side controller integrated circuit (IC) that outputs a drive signal on a switch pin to control a switching operation of a switch that is coupled to a primary winding of a transformer. The primary-side controller IC places the switch pin at high impedance during a sense window and turns on the switch in response to sensing a dynamic detection signal on the switch pin during the sense window. The dynamic detection signal is induced by a secondary-side controller IC by controlling switching of a switch that is coupled to a secondary winding of the transformer when the output voltage drops below a predetermined threshold during standby or other low load conditions.Type: GrantFiled: May 19, 2017Date of Patent: July 17, 2018Assignee: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Zhibo Tao, Zhao-Jun Wang, Chih-Hsien Hsieh, Li Lin
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Publication number: 20180166993Abstract: An exemplary embodiment of an alternating valley switching controller is provided. The alternating valley switching controller includes a valley detection circuit and an alternating circuit. The valley detection circuit is coupled to an auxiliary winding of a transformer to generate a valley-detection signal. The alternating circuit alternates a plurality of switching periods of a switching signal according to a blanking-window signal and the valley-detection signal. The blanking-window signal switches between a first voltage level and a second voltage level in the plurality of switching periods. The plurality of switching periods includes at least two first periods and at least two second periods which occur alternately in response to the first voltage level and the second voltage of the blanking-window signal.Type: ApplicationFiled: February 9, 2018Publication date: June 14, 2018Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Chien-Tsun HSU, Hang-Seok CHOI, Chih-Hsien HSIEH
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Patent number: 9985548Abstract: A method for communicating with a power converter comprises initiating a communication sequence by sensing a first distortion of a sensed waveform during a discharge period of a first power transfer cycle of the power converter. The sensed waveform is proportional to a secondary current of the power converter. At a primary side of the power converter, a data bit is received from a secondary side of the power converter, by sensing a second distortion to represent one state of the data bit and sending an absence of the second distortion to represent another state of the data bit. The secondary distortion is applied to the secondary current during the discharge period of a subsequent power transfer cycle.Type: GrantFiled: June 19, 2017Date of Patent: May 29, 2018Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Li Lin, Zhibo Tao, Chih Hsien Hsieh, Yue-Hong Tang, Ching Wen Fu, Ju-Hyun Kim
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Patent number: 9929657Abstract: An exemplary embodiment of an alternating valley switching controller is provided. The alternating valley switching controller includes a valley detection circuit and an alternating circuit. The valley detection circuit is coupled to an auxiliary winding of a transformer to generate a valley-detection signal. The alternating circuit alternates a plurality of switching periods of a switching signal according to a blanking-window signal and the valley-detection signal. The blanking-window signal switches between a first voltage level and a second voltage level in the plurality of switching periods. The plurality of switching periods includes at least two first periods and at least two second periods which occur alternately in response to the first voltage level and the second voltage of the blanking-window signal.Type: GrantFiled: February 16, 2016Date of Patent: March 27, 2018Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Chien-Tsun Hsu, Hang-Seok Choi, Chih-Hsien Hsieh
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Publication number: 20170373606Abstract: A method for communicating with a power converter comprises initiating a communication sequence by sensing a first distortion of a sensed waveform during a discharge period of a first power transfer cycle of the power converter. The sensed waveform is proportional to a secondary current of the power converter. At a primary side of the power converter, a data bit is received from a secondary side of the power converter, by sensing a second distortion to represent one state of the data bit and sending an absence of the second distortion to represent another state of the data bit. The secondary distortion is applied to the secondary current during the discharge period of a subsequent power transfer cycle.Type: ApplicationFiled: June 19, 2017Publication date: December 28, 2017Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Li LIN, Zhibo TAO, Chih Hsien HSIEH, Yue-Hong TANG, Ching Wen FU, Ju-Hyun KIM
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Publication number: 20170366044Abstract: An electrical circuit for a power supply includes a primary-side controller integrated circuit (IC) that outputs a drive signal on a switch pin to control a switching operation of a switch that is coupled to a primary winding of a transformer. The primary-side controller IC places the switch pin at high impedance during a sense window and turns on the switch in response to sensing a dynamic detection signal on the switch pin during the sense window. The dynamic detection signal is induced by a secondary-side controller IC by controlling switching of a switch that is coupled to a secondary winding of the transformer when the output voltage drops below a predetermined threshold during standby or other low load conditions.Type: ApplicationFiled: May 19, 2017Publication date: December 21, 2017Applicant: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Zhibo TAO, Zhao-Jun WANG, Chih-Hsien HSIEH, Li LIN
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Publication number: 20170302184Abstract: In one embodiment, a power supply controller, or alternately a semiconductor device having a power supply controller, may have a circuit configured configuring the PWM circuit to form a first signal having a value formed to be representative of a peak value of a primary current through the power switch and having a duration that is representative of a time interval that a secondary current is flowing through a secondary winding wherein the peak value is the peak value during an on-time of the power switch, and configured to form a current having a value that is representative of an average value of the secondary current.Type: ApplicationFiled: March 28, 2017Publication date: October 19, 2017Applicant: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Lei CHEN, Chih-Hsien HSIEH, Yue-Hong TANG
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Publication number: 20170302185Abstract: In one embodiment, a power supply controller, or alternately a semiconductor device having a power supply controller, may have a first circuit configured to form a sense signal that is representative of a signal from an auxiliary winding of a transformer. A feedback circuit may be configured to allow the sense signal to increase in response to a turn-off of the power switch, to subsequently detect a second increase of the sense signal prior to subsequently turning on the power switch, and to form a feedback signal as a value of the sense signal responsively to the second increase of the sense signal.Type: ApplicationFiled: March 29, 2017Publication date: October 19, 2017Applicant: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Zhibo TAO, Chih-Hsien HSIEH, Yue-Hong TANG
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Publication number: 20160261201Abstract: A switched-mode power supply with near valley switching includes a quasi-resonant converter. The converter includes a switch element that is turned on not only at the valley, but also in a window range of ?tNVW close to the valley, where the voltage across the switch element is at its minimum. This advantageously reduces switching loss and maintains a balance between efficiency and frequency variation.Type: ApplicationFiled: February 25, 2016Publication date: September 8, 2016Applicant: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Zhibo TAO, Jung-Sheng CHEN, Li LIN, Kai-Fang WEI, Chih-Hsien HSIEH, Hangseok CHOI, Yue-Hong TANG
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Publication number: 20160241150Abstract: An exemplary embodiment of an alternating valley switching controller is provided. The alternating valley switching controller includes a valley detection circuit and an alternating circuit. The valley detection circuit is coupled to an auxiliary winding of a transformer to generate a valley-detection signal. The alternating circuit alternates a plurality of switching periods of a switching signal according to a blanking-window signal and the valley-detection signal. The blanking-window signal switches between a first voltage level and a second voltage level in the plurality of switching periods. The plurality of switching periods includes at least two first periods and at least two second periods which occur alternately in response to the first voltage level and the second voltage of the blanking-window signal.Type: ApplicationFiled: February 16, 2016Publication date: August 18, 2016Inventors: Chien-Tsun HSU, Hang-Seok CHOI, Chih-Hsien HSIEH
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Publication number: 20160241016Abstract: A power adapter includes a protocol integrated circuit (IC) on a secondary side of a transformer and a controller IC on a primary side of the transformer. The power adapter has an output voltage that changes depending on the charging voltage requirement of an electronic device (e.g., mobile device) connected to receive power from the power adapter. The power adapter includes an adaptive overvoltage protection mode that sets an overvoltage protection threshold to a low level during startup and thereafter sets the overvoltage protection threshold to a higher level after detecting proper operation of the protocol IC.Type: ApplicationFiled: January 29, 2016Publication date: August 18, 2016Applicant: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Dibyendu RANA, Chih-Hsien HSIEH, Demon HSU, Hangseok CHOI
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Patent number: 9344002Abstract: An adaptive sampling circuit of the power converter according to the present invention comprises a sample-and-hold unit and a signal-generation circuit. The sample-and-hold unit is coupled to a transformer to generate a feedback signal by sampling a demagnetized voltage of the transformer in response to a sample signal. The signal-generation circuit generates the sample signal in response to a magnetized voltage of the transformer, the demagnetized voltage of the transformer, a switching signal and a code. The sample signal is used for sampling the demagnetized voltage. The feedback signal is correlated to an output voltage of the power converter. The switching signal is generated in response to the feedback signal for switching the transformer and regulating the output of the power converter. The adaptive sampling circuit is used to precisely measure the demagnetized voltage of the transformer without the limitation of the transformer design.Type: GrantFiled: January 16, 2013Date of Patent: May 17, 2016Assignee: System General Corp.Inventors: Ta-Yung Yang, Li Lin, Jung-Sheng Chen, Chih-Hsien Hsieh
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Patent number: 9252676Abstract: A control circuit of a flyback power converter according to the present invention comprises a low-side transistor, an active-clamper, a high-side drive circuit, and a controller. The low-side transistor is coupled to switch a transformer. The active-clamper is coupled in parallel with the transformer. The high-side drive circuit is coupled to drive the active-clamper. The controller generates a switching signal and an active-clamp signal. The switching signal is coupled to drive the low-side transistor. The switching signal is generated in accordance with a feedback signal for regulating an output of the flyback power converter. The active-clamp signal is coupled to control the high-side drive circuit and the active-clamper. The active-clamp signal is generated in response to a demagnetizing time of the transformer. The pulse number of the active-clamp signal is less than the pulse number of the switching signal in a light load condition.Type: GrantFiled: February 18, 2014Date of Patent: February 2, 2016Assignee: System General Corp.Inventors: Ta-yung Yang, Chih-hsien Hsieh, Kai-fang Wei, Jung-sheng Chen
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Patent number: 9093918Abstract: The present invention provides a control circuit for a power converter. The control circuit includes a switching circuit, an input-voltage detection circuit and a current-limit threshold. The switching circuit generates a switching signal coupled to switch a transformer of the power converter for regulating an output of the power converter in response to a feedback signal. The input-voltage detection circuit generates a control signal when an input voltage of the power converter is lower than a low-input threshold. The feedback signal is generated in response to the output of the power converter. A maximum duty of the switching signal is increased in response to the control signal. The current-limit threshold is for limiting a maximum value of a switching current flowing through the transformer. The current-limit threshold is increased in response to the control signal. An input of the power converter doesn't connect with electrolytic bulk capacitors.Type: GrantFiled: September 5, 2012Date of Patent: July 28, 2015Assignee: SYSTEM GENERAL CORPORATIONInventors: Ta-Yung Yang, Chih-Hsien Hsieh, Jung-Sheng Chen
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Publication number: 20140233275Abstract: A control circuit of a flyback power converter according to the present invention comprises a low-side transistor, an active-damper, a high-side drive circuit, and a controller. The low-side transistor is coupled to switch a transformer. The active-damper is coupled in parallel with the transformer. The high-side drive circuit is coupled to drive the active-clamper. The controller generates a switching signal and an active-clamp signal. The switching signal is coupled to drive the low-side transistor. The switching signal is generated in accordance with a feedback signal for regulating an output of the flyback power converter. The active-clamp signal is coupled to control the high-side drive circuit and the active-damper. The active-clamp signal is generated in response to a demagnetizing time of the transformer. The pulse number of the active-clamp signal is less than the pulse number of the switching signal in a light load condition.Type: ApplicationFiled: February 18, 2014Publication date: August 21, 2014Applicant: System General Corp.Inventors: TA-YUNG YANG, CHIH-HSIEN HSIEH, KAI-FANG WEI, JUNG-SHENG CHEN
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Patent number: 8664998Abstract: An adaptive filter circuit for sampling a reflected voltage of a transformer of a power converter includes a first switch for receiving the reflected voltage, a resistor having a first terminal and a second terminal, the first terminal of the resistor being coupled to the first switch, a capacitor coupled to the second terminal of the resistor for holding the reflected voltage, and a second switch coupled to the resistor in parallel, wherein the resistor and the capacitor develop a filter for sampling the reflected voltage which is sampled without filtering by the filter in a first period during a disable period of a switching signal and also sampled with filtering by the filter in a second period during the disable period of the switching signal.Type: GrantFiled: December 23, 2011Date of Patent: March 4, 2014Assignee: System General CorporationInventors: Ta-Yung Yang, Li Lin, Jung-Sheng Chen, Chih-Hsien Hsieh, Yue-Hong Tang
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Patent number: 8587964Abstract: A control circuit for power converter according to the present invention comprises a PWM circuit generating a switching signal coupled to switch a transformer of the power converter. A feedback input circuit is coupled to an output of the power converter for generating a feedback signal. The feedback signal is coupled to turn off the switching signal. A detection circuit is coupled to the transformer for generating a valley signal in response to a waveform of the transformer. A frequency-variation circuit is coupled to receive the feedback signal and the valley signal for generating a frequency-variation signal. The frequency-variation signal is coupled to turn on the switching signal. A burst circuit is coupled to receive the feedback signal for generating a burst signal to disable the switching signal.Type: GrantFiled: July 14, 2011Date of Patent: November 19, 2013Assignee: System General Corp.Inventors: Ta-yung Yang, Jung-Sheng Chen, Chuh-Ching Li, Chih-Hsien Hsieh
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Patent number: 8432109Abstract: A control circuit of a LED driver according to the present invention comprises an output circuit, an input circuit and an input-voltage detection circuit. The output circuit generates a switching signal to produce an output current for driving at least one LED in response to a feedback signal. The switching signal is coupled to switch a transformer. The input circuit samples an input signal for generating the feedback signal. The input signal is correlated to the output current of the LED driver. The input-voltage detection circuit generates an input-voltage signal in response to an input voltage of the LED driver. The input circuit will not sample the input signal when the input-voltage signal is lower than a threshold. The control circuit can eliminate the need of the input capacitor for improving the reliability of the LED driver.Type: GrantFiled: March 28, 2011Date of Patent: April 30, 2013Assignee: System General Corp.Inventors: Ta-Yung Yang, Li Lin, Chih-Hsien Hsieh, Chuh-Ching Li, Chi-Yin Lo, Kuo-Hsiem Huang
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Publication number: 20130094253Abstract: The present invention provides a control circuit for a power converter. The control circuit includes a switching circuit, an input-voltage detection circuit and a current-limit threshold. The switching circuit generates a switching signal coupled to switch a transformer of the power converter for regulating an output of the power converter in response to a feedback signal. The input-voltage detection circuit generates a control signal when an input voltage of the power converter is lower than a low-input threshold. The feedback signal is generated in response to the output of the power converter. A maximum duty of the switching signal is increased in response to the control signal. The current-limit threshold is for limiting a maximum value of a switching current flowing through the transformer. The current-limit threshold is increased in response to the control signal. An input of the power converter doesn't connect with electrolytic bulk capacitors.Type: ApplicationFiled: September 5, 2012Publication date: April 18, 2013Applicant: SYSTEM GENERAL CORPORATIONInventors: Ta-Yung YANG, Chih-Hsien HSIEH, Jung-Sheng CHEN
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Publication number: 20120212287Abstract: An adaptive filter circuit for sampling a reflected voltage of a transformer of a power converter includes a first switch for receiving the reflected voltage, a resistor having a first terminal and a second terminal, the first terminal of the resistor being coupled to the first switch, a capacitor coupled to the second terminal of the resistor for holding the reflected voltage, and a second switch coupled to the resistor in parallel, wherein the resistor and the capacitor develop a filter for sampling the reflected voltage which is sampled without filtering by the filter in a first period during a disable period of a switching signal and also sampled with filtering by the filter in a second period during the disable period of the switching signal.Type: ApplicationFiled: December 23, 2011Publication date: August 23, 2012Applicant: System General CorporationInventors: Ta-Yung YANG, Li Lin, Jung-Sheng Chen, Chih-Hsien Hsieh, Yue-Hong Tang