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    Inverter apparatus and method for high frequency fluorescent lamp operation
    2.
    发明授权
    Inverter apparatus and method for high frequency fluorescent lamp operation 失效
    逆变器装置和高频荧光灯操作方法

    公开(公告)号：US3707648A

    公开(公告)日：1972-12-26

    申请号：US3707648D

    申请日：1970-09-28

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： ROSA JOHN

    IPC: H02M7/515 ,  H05B41/282 ,  H05B37/00

    CPC classification number: H05B41/282 ,  H02M7/515 ,  Y02B20/183 ,  Y10S315/05

    Abstract: Apparatus and method for operating fluorescent lamps with high frequency AC inverted from a DC source comprises a thyristor bridge having an inductor in circuit therewith. The bridge is adapted to be connected directly to the power source and is also adapted to be disconnected therefrom to permit ''''free-wheeling'''' operation of the lamps from energy previously stored in the inductor. For a part of each operating half cycle, energy previously stored in the inductor is used to operate the lamps with the power supply being disconnected, and for the remainder of the half cycle, the lamps are operated directly from the power source and energy is stored in the inductor for lamp operation during a part of the next half cycle.

    Abstract translation: 用于操作从DC电源反相的高频AC的荧光灯的装置和方法包括具有电路的电感器的晶闸管桥。 桥适于直接连接到电源，并且还适于与其断开连接，以允许灯从“预先存储在电感器中的能量”的“续流”操作。 对于每个运行半周期的一部分，先前存储在电感器中的能量用于在电源断开的情况下操作灯，并且在半周期的剩余时间内，灯直接从电源操作并且存储能量 在下一个半周期的一部分期间用于灯操作的电感器。

    Force commutation circuits
    4.
    发明授权
    Force commutation circuits 失效
    强制通信电路

    公开(公告)号：US3614594A

    公开(公告)日：1971-10-19

    申请号：US3614594D

    申请日：1970-03-11

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： ROSA JOHN

    IPC: H02M1/06 ,  H02M3/135 ,  H02M7/515 ,  H02M7/48

    CPC classification number: H02M1/06 ,  H02M3/135 ,  H02M7/5155

    Abstract: A commutation circuit is disclosed for commutating power-control switching devices, such as thyristors or silicon-controlled rectifiers, utilized for supplying a load from a DC source, wherein a commutating capacitor is operatively connected across the power control switching device to be commutated by selectively turning on commutation-controlled switching devices, which may also comprise thyristors or silicon-controlled rectifiers. Also unidirectional devices are employed to provide a circuit path for any reactive energy trapped in the load circuit during the commutation operation.

    Selective phase angle pulse-generating circuit
    5.
    发明授权
    Selective phase angle pulse-generating circuit 失效
    选择相角脉冲发生电路

    公开(公告)号：US3558915A

    公开(公告)日：1971-01-26

    申请号：US3558915D

    申请日：1968-03-01

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： WOOD PETER ,  ROSA JOHN

    IPC: H02M7/523 ,  H03K5/135 ,  H03K17/72 ,  H03K17/73 ,  H03D3/02

    CPC classification number: H03K17/73 ,  H02M7/5233 ,  H03K5/135 ,  H03K17/72

    Abstract: The present disclosure relates to circuitry for generating output pulses at a selected phase angle with respect to an alternating signal, such as a sinusoid, independent of the amplitude and frequency thereof and wherein the alternating signal may vary over a wide range of amplitudes and frequencies. The pulse-generating circuit is ideally adapted for use in induction heating apparatus of the type which employs an inverter drive including controlled switching devices for supplying an alternating signal to a tuned load including an induction heating coil. The circuit is operative to generate the output pulses by detecting, through peak detection for example, the substantial peak of the alternating signal and comparing a selected portion of the peak value with the instantaneous value of the alternating signal. The comparison is made in a comparison stage, including for example an active device such as a transistor or plurality of transistors, with operating power for the comparison stage being supplied from a separate power supply independent of the alternating signal. An output pulse at the selected phase angle is provided when the compared signals bear a predetermined relationship with respect to each other.

    Static surge-current limiter
    8.
    发明授权
    Static surge-current limiter 失效
    静态浪涌电流限制器

    公开(公告)号：US3921038A

    公开(公告)日：1975-11-18

    申请号：US44387574

    申请日：1974-02-19

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： KERNICK ANDRESS ,  ROSA JOHN ,  BOWLES DAVID L

    IPC: H02H9/02 ,  H02H7/10

    CPC classification number: H02H9/02

    Abstract: A solid state or static current limiter which provides a relatively low impedance electrical current conducting path between a source of power and a load or between two interconnected sources or networks during non-overload conditions. The main current carrying device comprises a thyristor or similar gated element which is shunted by an auxiliary circuit which includes a capacitive element, a controlled thyristor and an inductance element. The capacitive element is shunted by a current limiting circuit which cooperates with the capacitive element to limit current in the load once the main current carrying thyristor has been turned off and the current flowing therethrough has been commutated into the auxiliary circuit as when an overload or short circuit condition has been sensed in the load. The rate of turnoff of the main thyristor is limited primarily by the inductive element in the auxiliary circuit. The inductive element need not carry appreciable load current for an extended period of time as the main current limiting function for the circuit is provided by forward biasing a diode which is connected in series with a current limiting capacitor shortly after the main thyristor has been turned off.

    Abstract translation: 固态或静态限流器，其在非过载条件下提供功率源和负载之间或两个互连的源或网络之间的相对低阻抗的电流传导路径。 主载流装置包括由包括电容元件，受控晶闸管和电感元件的辅助电路分流的晶闸管或类似的门控元件。 电容元件由电流限制电路分流，该电流限制电路与电容元件配合，一旦主电流承载晶闸管已经关闭并且流过其中的电流已经被转换到辅助电路中，就会限制负载中的电流，如过载或短路 在负载中已经检测到电路状况。 主晶闸管的关断速率主要由辅助电路中的电感元件限制。 电感元件不需要延长的负载电流，因为电路的主要限流功能是通过在主晶闸管关断后不久与限流电容串联连接的二极管来提供的 。

    Novel integral firing angle control for converters
    9.
    发明授权
    Novel integral firing angle control for converters 失效
    用于转换器的新型集成式发射角控制

    公开(公告)号：US3585485A

    公开(公告)日：1971-06-15

    申请号：US3585485D

    申请日：1969-06-20

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： GYUGYI LASZLO ,  ROSA JOHN ,  PELLY BRIAN R

    IPC: H02M5/27 ,  H02M5/14 ,  H02M5/30

    CPC classification number: H02M5/271

    Abstract: An improved method of firing angle control of thyristor type converters and particularly cycloconverters each of the component waveforms of the converter as well as the composite output waveform of the converter are summed with a reference waveform and the difference resulting from each of the summations is integrated. The firing angles of the thyristors are established when a predetermined relationship exists between the integral corresponding to the composite output waveform and the integrals corresponding to the component waveforms. A system of control is employed wherein the firing points are determined as a function of the integral of the converter output waveform.

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