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| Number | Title | Issue Date |
| 5614771 | Extended high voltage SCR switch A high voltage switch in which an extended SCR is built in an insulated polysilicon layer for providing a single structure high voltage switch. The high voltage SCR is built by building unit SCRs comprising a cathode, a gate, an anode and a voltage sustai... | 03/25/1997 |
| 5331234 | Solid state switch A solid state switch, with reverse conducting thyristors, is designed to operate at 20 kV hold-off voltage, 1500 A peak, 1.0 μs pulsewidth, and 4500 pps, to replace thyratrons. The solid state switch is more reliable, more economical, and more easily rep... | 07/19/1994 |
| 4758942 | Turn-off control circuit for a gate turn-off thyristor A turn-off control circuit for a gate turn-off thyristor is used in a state where one end of an inductive load is connected therewith on the cathode side. The turn-off control circuit includes a first turning-off transistor, which takes-out electric curre... | 07/19/1988 |
| 4675800 | Power converter with a failure detector of a self-turn-off semiconductor element A power converter including a plurality of serially connected self-turn-off semiconductor elements, including a first control circuit for producing a plurality of control signals, and a plurality of second control circuits is connected to receive respecti... | 06/23/1987 |
| 4621314 | Thyristor converter control apparatus including differentiation arrangement to prevent abnormal operation An apparatus for controlling a thyristor converter includes a plurality of voltage detectors provided for individual series-connected thyristors respectively for detecting the presence or absence of voltage applied to the thyristors, and elements for gene... | 11/04/1986 |
| 4614897 | Switching circuit An electronic switch is disclosed that uses two complementary regenerative latches connected in a push-pull arrangement. The latches are interconnected so that when either latch turns on, the other latch is forced to turn off. In this arrangement, the inh... | 09/30/1986 |
| 4613932 | Method and circuit for reduction of stress in thyristors operating in the individual emergency firing mode The invention is a method and a circuit for the emergency firing of individual thyristors in a thyristor valve that have a protection circuit for providing an emergency gate control signal for firing the thyristor when the voltage applied thereto equals o... | 09/23/1986 |
| 4600917 | Gate-turn-off thyristor failure detecting circuit A gate-turn-off thyristor failure detecting circuit includes a detector which detects an off-gate signal for a gate-turn-off thyristor and a current level detector which compares the signal with a predetermined value and produces an output signal indicati... | 07/15/1986 |
| 4535400 | Means and method for simultaneously triggering series SCR's A method for simultaneously triggering a plurality of serially connected SCR's transfers energy from a relatively low voltage energy source to each of a plurality of energy storage devices which are coupled respectively to the gate of a corresponding SCR ... | 08/13/1985 |
| 4528462 | Integrated circuit switch using stacked SCRs An integrated circuit switch having a pair of serially connected SCRs with diodes connecting the gates of the SCRs to independent biasing and switching sources such that the second SCR is gated on first to enable the gating of the first SCR in the series ... | 07/09/1985 |
| 4528461 | Integrated circuit switch using stacked SCRs An integrated circuit switch having a pair of serially connected SCRs with diodes connecting the gates of the SCRs to an independent bias source such that the second SCR is gated on first to enable the gating of the first SCR in the series connection.... | 07/09/1985 |
| 4527227 | False recovery detection circuit for parallel or serial strings of thyristors A thyristor converter control system comprising a voltage detector for detecting the thyristor voltage and a detector output suppressing circuit provided at the output of the voltage detector. The detector output suppressing circuit operates to detect an ... | 07/02/1985 |
| 4477748 | Solid state ballast A thyristor/capacitor inverter bridge energizes the lamp circuit with a high frequency oscillating voltage derived from full-wave rectified line voltage. Lamp current is regulated by a commutation circuit which is synchronized with zero crossings of the t... | 10/16/1984 |
| 4432032 | Auxiliary voltage snubber circuit In an inverter comprising power transistors selectively switched on and off to supply a predetermined current waveform to an inductive load, including a standard RC voltage snubber for suppressing load generated voltage surges during turn-off transitions ... | 02/14/1984 |
| 4337404 | Apparatus for firing series-connected thyristors An apparatus for simultaneously firing a plurality of series-connected thyristors having a control pulse transformer for each thyristor. Each transformer has first and second primary windings, with the first windings being connected in series with each ot... | 06/29/1982 |
| 4333137 | Thyristor switch with transient protection and RF interference suppression A high voltage power converter has a number of thyristors interconnected. Symmetrical voltage dividers maintain equal voltage distribution across the thyristors. Each thyristor has a plurality of inductors associated therewith for reducing rapid current i... | 06/01/1982 |
| 4325114 | Gate controlling circuit for a thyristor converter A gate controlling circuit for a thyristor converter having a forward/reverse bias voltage detecting circuit connected between the anode and the cathode of one of a plurality of serially connected thyristors in a thyristor arm of the converter for determi... | 04/13/1982 |
| 4302651 | High-voltage SCR circuit for microwave oven and the like An SCR circuit is provided in a high-voltage supply for energizing a magnetron that is assembled in a microwave oven. The high-voltage supply circuit includes a voltage step-up transformer. This transformer is arranged with a low-voltage secondary winding... | 11/24/1981 |
| 4242594 | Switch arrangement A switch arrangement for interruption of an electrical current in a circuit with a large self-induction. One application of the switch arrangement is for systems where energy stored in an inductor is to be transferred to a load. In this case, the switch a... | 12/30/1980 |
| 4196359 | Differentially-charged and sequentially-switched square-wave pulse forming network A pulse forming network for delivering a high-energy square-wave pulse to a load, including a series of inductive-capacitive sections wherein the capacitors are differentially charged higher further from the load. Each charged capacitor is isolated from a... | 04/01/1980 |
| 4158151 | Semiconductor laser modulating circuit By using two or more series connected silicon controlled rectifiers a laser odulator is created which provides higher current, faster rise time and narrower pulses than can be provided by existing single or multiple silicon controlled rectifier circuits. I... | 06/12/1979 |
| 4100434 | Gate controlling apparatus for a thyristor valve A gate controlling apparatus for a thyristor valve including a plurality of series connected thyristors controlled by a narrow gate pulse. The apparatus includes means for judging whether the thyristor valve is to be in the conductive state or not, means ... | 07/11/1978 |
| 4084206 | Protection circuit for serially connected thyristors A protection circuit for protecting the thyristors of a series circuit of several thyristors, each of which has a corresponding firing circuit to which its anode-cathode voltage is applied. The protection circuit comprises: a plurality of first monitoring... | 04/11/1978 |
| 4077057 | Gas-insulated thyristor arrangement comprising a pressure encapsulation formed in the manner of a tank A gas-insulated thyristor arrangement with at least one thyristor column which is constructed of disk-type thyristors and is arranged, together with its associated drive and external-circuit modules, in a rotationally-symmetric shield which is fastened vi... | 02/28/1978 |
| 4023051 | Rectifier switch with series-connected thyristors A rectifier switch has a plurality of series-connected thyristors, the forward and reverse blocking voltages of which exhibit a large spread of at least 10%. A plurality of voltage limiting elements are disposed to shunt the plurality of series-connected ... | 05/10/1977 |
| 3984751 | High D.C. voltage generating apparatus A high D.C. voltage generating apparatus for generating a high D.C. voltage across an inductive load, in which a circuitry serving to supply a D.C. current to the load and a circuitry serving to generate a high D.C. voltage across the load are separated f... | 10/05/1976 |
| 3968397 | Firing apparatus for a plurality of electric valves The invention concerns a firing device for a number of electric valves, particularly thyristors. Each thyristor control path is associated with a firing circuit with a detector for electromagnetic radiation responsive to a transmitter which is controlled ... | 07/06/1976 |
| 3962624 | Thyristor rectifier A thyristor rectifier for a static converter is formed of a plurality of thyristors, each provided with a control device and a control circuit for the entire rectifier connected to these control devices. Detectors are provided and arrangements are provide... | 06/08/1976 |
| 3944815 | Firing apparatus for a plurality of electric valves The invention concerns a firing device for a number of electric valves, particularly thyristors. Each thyristor control path is associated with a firing circuit with a detector for electromagnetic radiation responsive to a transmitter which is controlled ... | 03/16/1976 |
