Patents Assigned to UIS Abler Electronics Co., Ltd.
  • Patent number: 6906501
    Abstract: A control method for the parallel-connected power converters includes a control circuit comprising a voltage feedback circuit and a current feed-forward circuit. The voltage feedback circuit, consisting of a voltage regulated control circuit and a waveform control circuit, is used to control the power converter's output voltage with constant amplitude and low total harmonic distortion. By adjusting the gain of waveform control circuit, it can regulate the current distribution among the parallel-connected power converters. The current feed-forward circuit separates the power converter's output current into the fundamental component and the harmonic component, and amplifies them by different gain. The amplified fundamental component acts as a fundamental resistor to suppress the circulating current among the parallel-connected power converters, and the amplified harmonic component acts as a harmonic damper for preventing from high frequency oscillation generated by the L-C filter.
    Type: Grant
    Filed: May 9, 2003
    Date of Patent: June 14, 2005
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Nan-Ying Shen, Yao-Jen Chang
  • Publication number: 20050088043
    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 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: Application
    Filed: June 29, 2004
    Publication date: April 28, 2005
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Ya-Tsung Feng, Chin-Chang Wu, Hung-Liang Chou, Nan-Ying Shen, Kuo-Fang Huang, Yao-Jen Chang
  • Patent number: 6876179
    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 is consisted of 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 the supplied current is approximated to be a sinusoidal waveform. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: April 5, 2005
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Hurng-Liang Chou, Chin-Chang Wu, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20040222776
    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: Application
    Filed: March 18, 2004
    Publication date: November 11, 2004
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Ya-Tsung Feng, Chi-Nan Hsieh, Yao-Jen Chang
  • Patent number: 6801023
    Abstract: A DC/DC boost converter is consisted of an inductor, a power electronic switch, a control circuit, a first diode, a second diode and a capacitor. The power electronic switch is not operated if the input DC voltage is higher than the specified low reference DC voltage and it is regarded as the normal input DC voltage. If the input DC voltage is lower than the specified low reference DC voltage and this condition is regarded as the abnormal input DC voltage, the power electronic switch is controlled by pulse width modulation control and a dc voltage across the capacitor is created. Then, the output DC voltage is the summation of the input DC voltage and the capacitor voltage. Thus, the inventive DC/DC boost converter operates only when the input DC voltage is abnormal, thereby avoid additional power loss in the duration of normal input DC voltage.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: October 5, 2004
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Ming-Hong Chiueh, Yao-Jen Chang
  • Publication number: 20040155633
    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 is consisted of 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 provide with a serial-connected virtual harmonic damping. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.
    Type: Application
    Filed: July 25, 2003
    Publication date: August 12, 2004
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20040090212
    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 is consisted of 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: Application
    Filed: August 25, 2003
    Publication date: May 13, 2004
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Wen-Pin Hsu, Yao-Jen Chang
  • Publication number: 20040090214
    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 is consisted of 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 the supplied current is approximated to be a sinusoidal waveform. Therefore, it can avoid the destruction of AC power capacitor caused by the power resonance.
    Type: Application
    Filed: April 29, 2003
    Publication date: May 13, 2004
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Hurng-Liang Chou, Chin-Chang Wu, Wen-Pin Wu, Yao-Jen Chang
  • Publication number: 20040076027
    Abstract: A control method for the parallel-connected power converters includes a control circuit comprising a voltage feedback circuit and a current feed-forward circuit. The voltage feedback circuit, consisting of a voltage regulated control circuit and a waveform control circuit, is used to control the power converter's output voltage with constant amplitude and low total harmonic distortion. By adjusting the gain of waveform control circuit, it can regulate the current distribution among the parallel-connected power converters. The current feed-forward circuit separates the power converter's output current into the fundamental component and the harmonic component, and amplifies them by different gain. The amplified fundamental component acts as a fundamental resistor to suppress the circulating current among the parallel-connected power converters, and the amplified harmonic component acts as a harmonic damper for preventing from high frequency oscillation generated by the L-C filter.
    Type: Application
    Filed: May 9, 2003
    Publication date: April 22, 2004
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Nan-Ying Shen, Yao-Jen Chang
  • Publication number: 20040066179
    Abstract: A DC/DC boost converter is consisted of an inductor, a power electronic switch, a control circuit, a first diode, a second diode and a capacitor. The power electronic switch is not operated if the input DC voltage is higher than the specified low reference DC voltage and it is regarded as the normal input DC voltage. If the input DC voltage is lower than the specified low reference DC voltage and this condition is regarded as the abnormal input DC voltage, the power electronic switch is controlled by pulse width modulation control and a dc voltage across the capacitor is created. Then, the output DC voltage is the summation of the input DC voltage and the capacitor voltage. Thus, the inventive DC/DC boost converter operates only when the input DC voltage is abnormal, thereby avoid additional power loss in the duration of normal input DC voltage.
    Type: Application
    Filed: April 23, 2003
    Publication date: April 8, 2004
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Ming-Hong Chiueh, Yao-Jen Chang
  • Patent number: 6717465
    Abstract: 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: Grant
    Filed: December 31, 2002
    Date of Patent: April 6, 2004
    Assignee: UIS Abler Electronics Co., Ltd.
    Inventors: Hurng-Liang Chou, Chin-Chang Wu, Ya-Tsung Feng, Yao-Jen Chang
  • Publication number: 20030184926
    Abstract: A hybrid switch module comprises an auxiliary thyristor switch turning on/off an AC power capacitor, an electromagnetic switch connected parallel thereto, and a control circuit outputting control signals with time difference thereto. During the turn on process, a control signal turns on the thyristor switch while the voltage across the hybrid switch module at the zero crossing point, and then turns on the electromagnetic switch that minimizes an inrush current on the energized capacitor. The thyristor is disabled as the electromagnetic switch is turned on. During the turn off process, a control signal turns on the thyristor switch, and then the electromagnetic switch is turned off to avoid an electric arc due to the voltage across the electromagnetic switch. The driving signal of the thyristor switch is disabled after the electromagnetic switch is completely turned off, and the thyristor switch is turned off while current passing through is at the zero crossing point.
    Type: Application
    Filed: December 31, 2002
    Publication date: October 2, 2003
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hurng-Liang Chou, Kuen-Der Wu, Yao-Jen Chang
  • Publication number: 20030169109
    Abstract: 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: Application
    Filed: December 31, 2002
    Publication date: September 11, 2003
    Applicant: UIS Abler Electronics Co., Ltd.
    Inventors: Hurng Liang Chou, Chin Chang Wu, Ya Tsung Feng, Yao Jen Chang