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    BACKUP POWER SOURCE AND PROVIDING METHOD FOR BACKUP POWER TO AC BUS AND POWER FACILITY
    1.
    发明专利
    BACKUP POWER SOURCE AND PROVIDING METHOD FOR BACKUP POWER TO AC BUS AND POWER FACILITY 失效

    公开(公告)号：JP2000166126A

    公开(公告)日：2000-06-16

    申请号：JP33131099

    申请日：1999-11-22

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： MAO HENGCHUN

    IPC: H02J7/34 ,  H02J9/06 ,  H02M7/72 ,  H02M7/48

    Abstract: PROBLEM TO BE SOLVED: To provide a system for providing backup power suitable for use with a remote communications system such as a wireless base station. SOLUTION: A backup power source 150 which is used with this power facility provides primary power to an AC bus 140 for conversion into DC power performed afterwards. This system comprises a battery charger/inverter 155 which is connected to the AC bus bar and is connectable to a battery 160. The battery charger/inverter operates so as to convert a part of the primary power and to charge the battery in a normal mode, and operates so as to convert the DC power from the battery, and to provide backup power to the AC bus bar, in a battery backup mode.

    TEMPERATURE COMPENSATION CIRCUIT
    2.
    发明专利
    TEMPERATURE COMPENSATION CIRCUIT 失效

    公开(公告)号：JP2000116119A

    公开(公告)日：2000-04-21

    申请号：JP28396999

    申请日：1999-10-05

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： MAO HENGCHUN

    IPC: H02M3/155 ,  H02M3/156

    Abstract: PROBLEM TO BE SOLVED: To provide such a system that can stabilize the control of a power converter by compensating the influence of temperature on the element of the converter and protecting an electric current. SOLUTION: A temperature compensation circuit, which is used together with a semiconductor switch 110 indicating a temperature-dependent electric characteristic, and a current detecting circuit 115 which adopts the characteristic of the switch 110 for obtaining a switch current signal, is arranged in a state of transferring heat generated from the switch 110, has a temperature-dependent electric characteristic which is in the inverse relation with that of the switch 110, and is provided with an electric element 105 which generates an intermediate signal based on the actual temperature of the switch 110, and a signal adjusting circuit 120 which is connected to the element 105 and adjusts the intermediate signal for generating the compensating signal corresponding to the variation of the temperature dependency of the switch current signal.

    DOUBLE OUTPUT POWER SUPPLY AND ITS OPERATION METHOD
    3.
    发明专利
    DOUBLE OUTPUT POWER SUPPLY AND ITS OPERATION METHOD 失效

    公开(公告)号：JP2000152654A

    公开(公告)日：2000-05-30

    申请号：JP32185699

    申请日：1999-11-12

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： FARRINGTON MARK W ,  JACOBS MARK E ,  MAO HENGCHUN ,  THOTTUVELIL VIJAYAN J

    IPC: H02M3/28 ,  H02M3/335 ,  H02M7/48

    Abstract: PROBLEM TO BE SOLVED: To comprise both AC and DC voltages and to achieve the bi- directional four-quadrant power flow by operating a bi-directional switch during one portion of the switching cycle of an AC voltage, which is connected between the input and output of a four-quadrant inverter, thereby changing the voltage of an output waveform. SOLUTION: A main bi-directional switch Sa with first and second uni-directional switches Sw1 and Sw2 are connected between the input and output of a four-quadrant inverter 150. Also, a controller 160 that is connected to an auxiliary bi-directional switch Sb and the main bi-directional switch Sa with third and fourth uni-directional switches Sw3 and Sw4 of the four-quadrant inverter 150 operates Sa and Sb so that the input and output of the four- quadrant inverter 150 can be connected during the main period or the auxiliary period of the switching cycle of the AC voltage. therefore, by adjusting the continuity period of the main and auxiliary bi-directional switches Sa and Sb, the AC output voltage of the AC output waveform can be changed.

    POWER FACTOR CORRECTING ELECTRIC CONVERTER
    4.
    发明专利
    POWER FACTOR CORRECTING ELECTRIC CONVERTER 失效

    公开(公告)号：JP2001190073A

    公开(公告)日：2001-07-10

    申请号：JP2000356856

    申请日：2000-11-24

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： MAO HENGCHUN

    IPC: H02M7/12 ,  H02M1/00 ,  H02M1/42 ,  H02M3/00

    Abstract: PROBLEM TO BE SOLVED: To provide an apparatus and a method for reducing the distortion of an input current near the zero crossing point of an input signal. SOLUTION: The power factor correcting electric converter comprises an input tracing circuit 150 connected to a power source, a rectifier 12 connected to the power source, and a filtering circuit 2 connected to the rectifier. In this case, an input detector 26 is connected to the circuit 150, and its output circuit is connected to the circuit 22. A feedback circuit 52 is connected to an input detecting node 32 and an output detecting node 50 to receive an input designation signal and an output designation signal and to generate a gating signal. The output circuit responds to the gating signal to control to switch the connection to a load. The input detector or the feedback circuit may be constituted to delay to differentiate the phases of the input designation signal and the input signal.

    POWER SUPPLY FOR USING CIRCULATION CAPACITOR AND ITS OPERATION METHOD
    5.
    发明专利
    POWER SUPPLY FOR USING CIRCULATION CAPACITOR AND ITS OPERATION METHOD 失效

    公开(公告)号：JP2000152615A

    公开(公告)日：2000-05-30

    申请号：JP32187399

    申请日：1999-11-12

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： JACOBS MARK E ,  JIANG YIMIN ,  MAO HENGCHUN ,  THOTTUVELIL VIJAYAN J

    IPC: H02M3/28 ,  H02M3/335 ,  H02M7/48

    Abstract: PROBLEM TO BE SOLVED: To reduce costs and simplify structure by providing an insulation transformer with primary coil winding that is connected to a primary side power switch, a secondary side power switch that is connected to the secondary coil winding of the insulation transformer, and a capacitor that is connected to the secondary side power switch. SOLUTION: A secondary side power switch Sw can be operated so that it conducts electricity during the conduction period of a primary side power switch to allow current to flow from an insulation transformer T1 to output. The current is partially accumulated in a power supply 200 during the non- conduction period of the secondary side power switch Sw. Therefore, the power supply 200 further includes a capacitor (circulation capacitor Cf) that is connected to the secondary side power switch Sw for circulating one portion of current during the non-conduction period of the secondary side power switch Sw in the direction of the output. The costs of the capacitor are low and the use of a bi-directional active switch prevents the structure from becoming complex as a passive device.

    POWER CONVERTER HAVING MULTIPLE OUTPUT VOLTAGE CAPABILITY AND METHOD OF OPERATION THEREOF
    8.
    发明专利
    POWER CONVERTER HAVING MULTIPLE OUTPUT VOLTAGE CAPABILITY AND METHOD OF OPERATION THEREOF 未知

    公开(公告)号：CA2246840A1

    公开(公告)日：1999-03-23

    申请号：CA2246840

    申请日：1998-09-09

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： MAO HENGCHUN ,  JACOBS MARK ELLIOTT

    IPC: H02M3/28 ,  H02M7/06

    Abstract: For use in a power converter having first and second output diodes coupled to a secondary winding of an isolation transformer and first and second output inductors, coupled to the first and second output diodes, respectively, and an output derived from the first and second output inductors and a center tap of the secondary winding, a circuit for, and method of allowing the power converter to provide an output current at multiple output voltages. In one embodiment, the circuit includes: (1) a contactor, coupled to a first node between the first output diode and output inductor and a second node between the second output diode and output inductor, that selectively: (1a) closes to create an inter-inductor conductive path to couple the first and second output inductors in parallel and to allow the power converter to operate at a first output voltage and (1b) opens to break the inter-inductor conductive path and to allow the power converter to operate at a second output voltage lower than the first output voltage and (2) first and second conductive paths, coupling the center tap to the first node and the second node, respectively, that provide conductive paths for the output current.

    A SWITCHING NETWORK AND METHOD OF REDUCING INPUT CURRENT TOTAL HARMONIC DISTORTION FOR A BOOST CONVERTER
    10.
    发明专利
    A SWITCHING NETWORK AND METHOD OF REDUCING INPUT CURRENT TOTAL HARMONIC DISTORTION FOR A BOOST CONVERTER 未知

    公开(公告)号：CA2273477A1

    公开(公告)日：2000-01-17

    申请号：CA2273477

    申请日：1999-05-28

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： JIANG YIMIN ,  MAO HENGCHUN

    IPC: H02M1/00 ,  H02M1/42 ,  H02M1/12 ,  H02M7/06

    Abstract: For use with a boost converter having first, second and third input inductors, a switching network, method of reducing input current total harmonic distortion (THD) associated with the boost converter, and boost converter employing the switching network and method. In one embodiment, the switching network includes a first switch coupled between corresponding rails of the boost converter. The switching network also includes first, second and third L-C resonant networks wye-coupled to a common node and coupled to the first, second and third input inductors, respectively. The first switch and the first, second and third L-C resonant networks cooperate to create resonant voltages across, and induce phase currents through, the first, second and third input inductors to reduce input current THD associated with the boost converter.

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