Patents Assigned to UIS Abler Electronics Co., Ltd.
  • Patent number: 7450407
    Abstract: A harmonic-suppressing AC/DC power converter employs a control method for permitting the AC/DC power converter only to detect an input AC current and an output DC voltage. The control method can control the AC side of the AC/DC power converter to generate a voltage which is proportional to the input AC current. Thereby, the AC/DC power converter acts as a virtual resistor having a linear resistance characteristic. Accordingly, the input AC current of the AC/DC power converter can be controlled to approximate nearly as a sinusoidal wave with the performance of high input power factor and low input harmonic current.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: November 11, 2008
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Min-Sheng Huang, Wen-Jet Hou
  • Patent number: 7398336
    Abstract: 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: Grant
    Filed: December 21, 2004
    Date of Patent: July 8, 2008
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Ya-Tsung Feng, Ming-Hung Chueh, Yu-Shan Liu, Yao-Jen Chang
  • Patent number: 7394237
    Abstract: 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: Grant
    Filed: October 3, 2006
    Date of Patent: July 1, 2008
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Hung-Liang Chou, Wen-Jung Chiang, Chin-Chang Wu, Ya-Tsung Feng, Li-Hsiang Lai
  • Patent number: 7345380
    Abstract: 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: Grant
    Filed: June 29, 2004
    Date of Patent: March 18, 2008
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Ya-Tsung Feng, Chin-Chang Wu, Hung-Liang Chou, Nan-Ying Shen, Kuo-Fang Huang, Yao-Jen Chang
  • Publication number: 20070290668
    Abstract: 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: Application
    Filed: October 3, 2006
    Publication date: December 20, 2007
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Hung-Liang Chou, Wen-Jung Chiang, Chin-Chang Wu, Ya-Tsung Feng, Li-Hsiang Lai
  • Patent number: 7301787
    Abstract: 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: Grant
    Filed: July 11, 2005
    Date of Patent: November 27, 2007
    Assignee: UIS Abler Electronics Co., ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Wen-Pin Hsu, Yao-Jen Chang
  • Patent number: 7272026
    Abstract: A power converter for a hybrid power filter includes a power electronic switch set and a DC capacitor. The power converter permits a power line of a power system to directly connect or connect through the passive power filter to a positive or a negative terminal of the DC capacitor of the power converter for free control of the power electronic switches. Consequently, the power converter has a structural configuration that reduces the number of power electronic switches, which can reduce manufacturing costs.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: September 18, 2007
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Hung-Liang Chou, Chin-Chang Wu, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20070103004
    Abstract: 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: Application
    Filed: October 12, 2006
    Publication date: May 10, 2007
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Hung-Liang Chou, Wen-Jung Chiang, Chin-Chang Wu, Ya-Tsung Feng
  • Publication number: 20070076451
    Abstract: 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: Application
    Filed: August 11, 2006
    Publication date: April 5, 2007
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Wen-Pin Hsu, Yu-Ting Kuo, Ya-Tsung Feng
  • Patent number: 7183751
    Abstract: A reactive power compensator device includes an AC capacitor and a small-capacity power converter serially connected thereto that avoid the problems of power resonance and harmonic current injection. The reactive power compensator device provides with compensation reactive power current with fixed amplitude or adjustable amplitude. The power converter permits one of power lines of a power system to be connected to either a positive or negative dc terminal of the power electronic switch set through no power electronic switch. Consequently, the number of the power electronic switches is reduced.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: February 27, 2007
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20060244426
    Abstract: A harmonic-suppressing AC/DC power converter employs a control method for permitting the AC/DC power converter only to detect an input AC current and an output DC voltage. The control method can control the AC side of the AC/DC power converter to generate a voltage which is proportional to the input AC current. Thereby, the AC/DC power converter acts as a virtual resistor having a linear resistance characteristic. Accordingly, the input AC current of the AC/DC power converter can be controlled to approximate nearly as a sinusoidal wave with the performance of high input power factor and low input harmonic current.
    Type: Application
    Filed: January 17, 2006
    Publication date: November 2, 2006
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Min-Sheng Huang, Wen-Jet Hou
  • Patent number: 7091704
    Abstract: 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: Grant
    Filed: June 16, 2005
    Date of Patent: August 15, 2006
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Hung-Liang Chou, Chin-Chang Wu, Wen-Pin Hsu, Ya-Tsung Feng, Yao-Jen Chang
  • Patent number: 7058672
    Abstract: A resonant protection kit for a power supply includes a circuit adapted to perform analysis, determinative, and counter functions. The circuit collects a divided voltage on a capacitor to calculate an effective voltage value and uses fundamental and non-fundamental waveforms to calculate an effective total current value of the capacitor. The circuit is selectively actuated to cut off the capacitor from a power system or adjust its impedance characteristic for protection if an abnormal voltage or current is sensed.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: June 6, 2006
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Yao-Jen Chang, Yi-Hu Lee, Hurng-Liahng Jou
  • Publication number: 20060044850
    Abstract: 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: Application
    Filed: July 11, 2005
    Publication date: March 2, 2006
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20060033479
    Abstract: 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: Application
    Filed: June 16, 2005
    Publication date: February 16, 2006
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Hung-Liang Chou, Chin-Chang Wu, Wen-Pin Hsu, Ya-Tsung Feng, Yao-Jen Chang
  • Patent number: 6982546
    Abstract: A hybrid reactive power compensation device comprises a passive type reactive power compensator and an active type reactive power compensator serially connected thereto. The passive type reactive power compensator is an AC power capacitor adapted to provide the reactive power that reduces capacity of the active type reactive power compensator. The active type reactive power compensator comprises a power converter, a DC capacitor, a high-frequency ripple filter and a controller. The hybrid reactive power compensation device can supply a linearly adjustable reactive power within a predetermined range, and is adapted to supply a current with a nearly sinusoidal waveform. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.
    Type: Grant
    Filed: August 25, 2003
    Date of Patent: January 3, 2006
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Wen-Pin Hsu, Yao-Jen Chang
  • Patent number: 6960901
    Abstract: 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: Grant
    Filed: March 18, 2004
    Date of Patent: November 1, 2005
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Chi-Nan Hsieh, Yao-Jen Chang
  • Publication number: 20050212494
    Abstract: A reactive power compensator device includes an AC capacitor and a small-capacity power converter serially connected thereto that avoid the problems of power resonance and harmonic current injection. The reactive power compensator device provides with compensation reactive power current with fixed amplitude or adjustable amplitude. The power converter permits one of power lines of a power system to be connected to either a positive or negative dc terminal of the power electronic switch set through no power electronic switch. Consequently, the number of the power electronic switches is reduced.
    Type: Application
    Filed: January 28, 2005
    Publication date: September 29, 2005
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20050207197
    Abstract: A power converter for a hybrid power filter includes a power electronic switch set and a DC capacitor. The power converter permits a power line of a power system to directly connect or connect through the passive power filter to a positive or a negative terminal of the DC capacitor of the power converter for free control of the power electronic switches. Consequently, the power converter has a lesser number of the power electronic switches that can reduce the manufacture cost.
    Type: Application
    Filed: January 28, 2005
    Publication date: September 22, 2005
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Hung-Liang Chou, Chin-Chang Wu, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20050154799
    Abstract: 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: Application
    Filed: December 21, 2004
    Publication date: July 14, 2005
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Ya-Tsung Feng, Ming-Hung Chueh, Yu-Shan Liu, Yao-Jen Chang