Patents by Inventor Ya-Tsung Feng
Ya-Tsung Feng 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: 7345380Abstract: A backup power supply system supplies power from a first ac power source in normal condition. Once the first ac power source is abnormal or fails, the system automatically turns off the first ac power source and turns on a second ac power source with null transfer time. When the first ac power source is normal, a dc/ac power inverter is controlled to supply an approximately null current such that a mechanical switch is allowed to be closed and no circulating current is generated between the first ac power source and the dc/ac power inverter. Since the mechanical switch is continuously closed, and requires no switching operation, the backup power supply system can supply the backup power with a null transfer time.Type: GrantFiled: June 29, 2004Date of Patent: March 18, 2008Assignee: UIS Abler Electronics Co., Ltd.Inventors: Ya-Tsung Feng, Chin-Chang Wu, Hung-Liang Chou, Nan-Ying Shen, Kuo-Fang Huang, Yao-Jen Chang
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Publication number: 20080062724Abstract: A bidirectional active power conditioner includes a DC side, a bidirectional DC/DC power converter, a DC/AC inverter and an AC side. The DC side electrically connects with a DC source while the AC side electrically connects with a load and an AC source. The bidirectional DC/DC power converter is controlled via high-frequency pulse width modulation (PWM) switching so as to generate a predetermined DC voltage or DC current while the DC/AC inverter is controlled to convert the predetermined DC voltage or DC current into a predetermined AC voltage or AC current.Type: ApplicationFiled: June 11, 2007Publication date: March 13, 2008Inventors: Ya-Tsung FENG, Chin-Chang WU, Hung-Liang CHOU
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Publication number: 20070290668Abstract: A maximum power point tracking method, applied to a tracking device, employs a DC/DC converter connecting with a solar cell array, and including a controller actuating the DC/DC converter to perform an active resistance characteristic; a maximum power point tracking circuit adjusting the active resistance of the DC/DC converter; monitoring a change of an output power of the solar cell array in determining a direction for adjusting the active resistance of the DC/DC converter; and the maximum power point tracking circuit repeatedly adjusting the active resistance of the DC/DC converter. If the change of the output power of the solar cell array is positive, the active resistance of the DC/DC converter is adjusted in the same direction; but, conversely, if the change of the output power of the solar cell array is negative, the active resistance of the DC/DC converter is adjusted in an opposite direction.Type: ApplicationFiled: October 3, 2006Publication date: December 20, 2007Applicant: UIS Abler Electronics Co., Ltd.Inventors: Hung-Liang Chou, Wen-Jung Chiang, Chin-Chang Wu, Ya-Tsung Feng, Li-Hsiang Lai
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Patent number: 7301787Abstract: An active type harmonic suppression apparatus, connected in parallel to a power feeder, supplies a compensation current for injecting into the power feeder such that a utility current of a power source is approached to a sinusoidal wave. The control circuit retrieves a load current, a utility current, an output current of the power converter, a power source voltage and a voltage of the dc power capacitor for calculating and sending a reference signal of compensation voltage to a pulse-width-modulation circuit which generates switching signals for the power converter. Furthermore, the harmonic suppression apparatus can provide a fixed or variable reactive power.Type: GrantFiled: July 11, 2005Date of Patent: November 27, 2007Assignee: UIS Abler Electronics Co., ltd.Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Wen-Pin Hsu, Yao-Jen Chang
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Publication number: 20070252600Abstract: A diagnosis method for SOH of batteries includes the steps of: providing data of discharge voltages and currents of a battery unit; setting an acceptable value of a predetermined period of time and an acceptable range of variation rate of discharge current for the battery unit; calculating variation rates of discharge voltages and currents of the battery unit within the predetermined period of time by using the data of discharge voltages and currents; recording the data of discharge voltages and currents of the batteries and variation rates thereof; comparing the data of discharge voltages of the batteries and the variation rates thereof if the variation rates of discharge current are fallen within the acceptable range of current variation with selected reference data; and converting results of compared data of discharge voltages of the battery unit and the variation rates thereof into a SOH index.Type: ApplicationFiled: January 22, 2007Publication date: November 1, 2007Applicant: ABLEREX ELECTRONICS CO., LTD.Inventors: Hung-Liang Chou, Yu-Hua Sun, Kuen-Der Wu, Chin-Chang Wu, Ming-Hsun Hsieh, Ya-Tsung Feng
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Publication number: 20070103004Abstract: An islanding detection apparatus for a distributed generation power system and a detection method therefor operates a power converter to act as a virtual capacitor or inductor at a frequency close to but unequal to that of a utility power system under abnormal condition of the utility power system. When power failure occurs in the utility power system, only the distributed generation power system supplies power to a load so that a load voltage has been changed in at least one of amplitude and frequency which can be immediately detected islanding phenomenon.Type: ApplicationFiled: October 12, 2006Publication date: May 10, 2007Applicant: UIS Abler Electronics Co., Ltd.Inventors: Hung-Liang Chou, Wen-Jung Chiang, Chin-Chang Wu, Ya-Tsung Feng
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Publication number: 20070076451Abstract: An active power conditioner, connecting with a load and a power source in parallel, includes a DC power capacitor, a power converter, a high-frequency filter and a control circuit. The control circuit detects the voltage of the DC power capacitor and the current of the power source, thereby performing a closed loop control to stabilize the voltage of the DC power capacitor and performing a feed forward control to generate a driving signal for driving the power converter. The power converter actuates the DC power capacitor to supply a current via the high-frequency filter to reduce the reactive and harmonic components of load current. The load is converted to the linear resistance characteristic, observed from the power source side.Type: ApplicationFiled: August 11, 2006Publication date: April 5, 2007Applicant: UIS Abler Electronics Co., Ltd.Inventors: Chin-Chang Wu, Hung-Liang Chou, Wen-Pin Hsu, Yu-Ting Kuo, Ya-Tsung Feng
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Patent number: 7091704Abstract: A three-phase three-wire active power filter includes a dc power capacitor, a power converter, a filter inductor set, a reactive power compensating capacitor set, a combined capacitor/resistor filtering set and a control circuit. The dc power capacitor provides with a regulated voltage. The power converter includes a two-arm bridge power converter, and has a pair of ac terminals and a pair of dc terminals. A phase of the three-phase three-wire active power filter, without control of the power electronic switch set, directly connects with any one of the dc terminals. Consequently, the number of power electronic switches employed in the two-arm bridge power converter of the three-phase three-wire active power filter can be reduced.Type: GrantFiled: June 16, 2005Date of Patent: August 15, 2006Assignee: UIS Abler Electronics Co., Ltd.Inventors: Hung-Liang Chou, Chin-Chang Wu, Wen-Pin Hsu, Ya-Tsung Feng, Yao-Jen Chang
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Publication number: 20060044850Abstract: An active type harmonic suppression apparatus, connected in parallel to a power feeder, supplies a compensation current for injecting into the power feeder such that a utility current of a power source is approached to a sinusoidal wave. The control circuit retrieves a load current, a utility current, an output current of the power converter, a power source voltage and a voltage of the dc power capacitor for calculating and sending a reference signal of compensation voltage to a pulse-width-modulation circuit which generates switching signals for the power converter. Furthermore, the harmonic suppression apparatus can provide a fixed or variable reactive power.Type: ApplicationFiled: July 11, 2005Publication date: March 2, 2006Applicant: UIS Abler Electronics Co., Ltd.Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Wen-Pin Hsu, Yao-Jen Chang
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Publication number: 20060033479Abstract: A three-phase three-wire active power filter includes a dc power capacitor, a power converter, a filter inductor set, a reactive power compensating capacitor set, a combined capacitor/resistor filtering set and a control circuit. The dc power capacitor provides with a regulated voltage. The power converter includes a two-arm bridge power converter, and has a pair of ac terminals and a pair of dc terminals. A phase of the three-phase three-wire active power filter, without control of the power electronic switch set, directly connects with any one of the dc terminals. Consequently, the number of power electronic switches employed in the two-arm bridge power converter of the three-phase three-wire active power filter can be reduced.Type: ApplicationFiled: June 16, 2005Publication date: February 16, 2006Applicant: UIS Abler Electronics Co., Ltd.Inventors: Hung-Liang Chou, Chin-Chang Wu, Wen-Pin Hsu, Ya-Tsung Feng, Yao-Jen Chang
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Patent number: 6960901Abstract: A bi-directional dc/dc power converter having a neutral terminal includes a first dc voltage terminal set and a second dc voltage terminal set. When the direction of power flow is from the first dc voltage terminal set to the second dc voltage terminal set, the Output voltage of power converter is the double of the input dc voltage. When the power flow direction is in reverse from the second dc voltage terminal set to the first dc voltage terminal set, the output voltage of power converter is half of the input dc voltage in this power flow direction.Type: GrantFiled: March 18, 2004Date of Patent: November 1, 2005Assignee: UIS Abler Electronics Co., Ltd.Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Chi-Nan Hsieh, Yao-Jen Chang
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Publication number: 20050154799Abstract: A switching device for RS-232 serial port and USB serial port is adapted to simultaneously provide a RS-232 serial port and a USB serial port for a micro-processor with a single USART. The switching device can automatically switch to select either of the RS-232 serial port or the USB serial port as a main interface for communicating with other external computer facilities and related peripheries. When one of the serial ports is selected as the main communication interface to communicate with one of external computers, the other one serial port thereof still can transmit signals from the micro-processor to another computer through its transmitting data pin (TXD).Type: ApplicationFiled: December 21, 2004Publication date: July 14, 2005Applicant: UIS Abler Electronics Co., Ltd.Inventors: Ya-Tsung Feng, Ming-Hung Chueh, Yu-Shan Liu, Yao-Jen Chang
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Publication number: 20050088043Abstract: A backup power supply system supplies power from a first ac power source in normal condition. Once the first ac power source is abnormal or failed, the system automatically turns off the first ac power source and turns on a second ac power source with null transfer time. When the first ac power source is normal, a dc/ac power inverter is controlled to supply an approximately null current that a mechanical switch is allowed to being closed and no circulating current is generated between the first ac power source and the dc/ac power inverter. Since the mechanical switch is successively closed, and it requires no switching operation, the backup power supply system can supply the backup power with a null transfer time.Type: ApplicationFiled: June 29, 2004Publication date: April 28, 2005Applicant: UIS Abler Electronics Co., Ltd.Inventors: Ya-Tsung Feng, Chin-Chang Wu, Hung-Liang Chou, Nan-Ying Shen, Kuo-Fang Huang, Yao-Jen Chang
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Publication number: 20040222776Abstract: A bi-directional dc/dc power converter having a neutral terminal includes a first dc voltage terminal set and a second dc voltage terminal set. When the direction of power flow is from the first dc voltage terminal set to the second dc voltage terminal set, the Output voltage of power converter is the double of the input dc voltage. When the power flow direction is in reverse from the second dc voltage terminal set to the first dc voltage terminal set, the output voltage of power converter is half of the input dc voltage in this power flow direction.Type: ApplicationFiled: March 18, 2004Publication date: November 11, 2004Applicant: UIS Abler Electronics Co., Ltd.Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Chi-Nan Hsieh, Yao-Jen Chang
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Patent number: 6717465Abstract: An active harmonic suppression equipment is consisted of a dc capacitor, a power converter, a serially connected inductor/capacitor set, a C-R-C filter set and a control circuit. The dc capacitor operates as an energy storage device and supplies a dc voltage, and the power converter electrically connected thereto is used to convert the dc voltage into a compensating voltage. The inductor/capacitor set and the C-R-C filter set are commonly converting the compensating voltage into a compensating current injecting into a power feeder in order to suppress harmonic currents generated by nonlinear loads, thereby adjusting an utility current to be approximated as a sine-wave.Type: GrantFiled: December 31, 2002Date of Patent: April 6, 2004Assignee: UIS Abler Electronics Co., Ltd.Inventors: Hurng-Liang Chou, Chin-Chang Wu, Ya-Tsung Feng, Yao-Jen Chang
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Publication number: 20030169109Abstract: An active harmonic suppression equipment is consisted of a dc capacitor, a power converter, a serially connected inductor/capacitor set, a C-R-C filter set and a control circuit. The dc capacitor operates as an energy storage device and supplies a dc voltage, and the power converter electrically connected thereto is used to convert the dc voltage into a compensating voltage. The inductor/capacitor set and the C-R-C filter set are commonly converting the compensating voltage into a compensating current injecting into a power feeder in order to suppress harmonic currents generated by nonlinear loads, thereby adjusting an utility current to be approximated as a sine-wave.Type: ApplicationFiled: December 31, 2002Publication date: September 11, 2003Applicant: UIS Abler Electronics Co., Ltd.Inventors: Hurng Liang Chou, Chin Chang Wu, Ya Tsung Feng, Yao Jen Chang