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| Number | Title | Issue Date |
| 7209819 | Drive circuit for a firing cap of a vehicle restraint system A drive circuit for a firing cap, triggerable by an electric direct current firing pulse, of a vehicle restraint system, has a firing circuit which forms a series connection of a high side switch to the firing cap and to a low side switch. The firing circuit is conn... | 04/24/2007 |
| 7072196 | Multi-stage high voltage solid state switch A method for triggering a high voltage solid state switch comprised of a set of thyristors connected in series. Initiating switch turn-on requires command triggering of only the lowest voltage thyristor, thereby eliminating the need for expensive high voltage pulse ... | 07/04/2006 |
| 7049793 | Boost switching power supply The present invention provides a boost switching power supply with low switching loss. The boost switching power supply of the present invention includes a coil portion 3a and a first diode 4 that are serially connected between one terminal of a... | 05/23/2006 |
| 6930899 | N-point-converter circuit An n-point-converter circuit with two series-connected power converter valves, each having (n−1) turn-off semiconductor switches, is disclosed. The converter circuit has a voltage intermediate circuit with (n−1) electrically series-connected capacitors. The volt... | 08/16/2005 |
| 6853570 | Circuit for quasi-square-wave or resonant driving of a capacitive load The invention discloses a method, together with circuits for performing these actions, of driving a capacitance with a quasi-square wave of variable duty cycle and frequency in such a manner that the energy stored in the capacitor is not lost. The energy is actually... | 02/08/2005 |
| 6654261 | Inverter DC link volts "tooth" modulation scheme The invention in the simplest form is a power conditioning and inverting system for improved and efficient power generation. In particular, the present invention is a modulated dc link scheme that dramatically reduces the switching frequency ripple across... | 11/25/2003 |
| 6563723 | Fault tolerant power supply circuit A fault current tolerant power supply circuit having a dc power source and switching devices for inverting dc current from the source into ac load current includes a protective circuit for protecting the switching devices from overvoltage conditions when ... | 05/13/2003 |
| 6404656 | Control equipment for thyristor-controlled series capacitor equipment, and a method for control thereof Thyristor-controlled series capacitor equipment (CEQ), intended for connection between an ac network (NET) and a converter (CONV), connected thereto, for conversion between alternating current ((IT) and high-voltage direct current (Id), with a controllabl... | 06/11/2002 |
| 6278626 | ARCP multi-point converter having variable-potential intermediate-circuit capacitances An ARCP converter having a series circuit formed of at least four main switches per converter phase, which are connected electrically in parallel between DC voltage rails is described. A capacitance is connected in parallel with each individual main switc... | 08/21/2001 |
| 6058037 | Power conversion device Reflux diode 5u~5w and 5x~5z are in anti-parallel connected to MOSFET 4u~4w and 4x~4z. When MOSFET 4u~4w and 4x~4z are turned OFF, an electric current flows in a forward direction to reflux diode 5u~5w and 5x~5z. In the case of this construction, whe... | 05/02/2000 |
| 5969959 | Converter circuit arrangement with protection circuit A converter circuit arrangement is specified having a rectifier, an intermediate circuit and an invertor connected thereto. In order to protect the circuit against failures and overvoltage, a protection circuit which comprises, in particular, varistors is... | 10/19/1999 |
| 5870292 | Series resonant converter for switched reluctance motor drive A resonant DC link converter which is specifically adapted for driving a switched reluctance motor (SRM) using low power (VA) rated switches, includes an input circuit providing a DC supply voltage, a resonating inductance (connected to the switched input... | 02/09/1999 |
| 5798916 | High power inverter pole employing series connected devices configured for reduced stray loop inductance A high power inverter pole for a voltage sourced inverter suitable for providing compensation in electric power transmission and distribution systems, has a positive switching valve and a negative switching valve connected between closely spaced dc-source... | 08/25/1998 |
| 5737205 | Semiconductor static electric power converter optimized for operation in zero-voltage mode The invention relates to static electric power conversion using semiconductors using soft switching in zero-voltage mode and controlled to perform pulse width modulation, having a first interface (L, C, Ta, Da) in series between a DC... | 04/07/1998 |
| 5731967 | Converter circuit arrangement with minimal snubber A converter circuit arrangement in which the gate turn-off thyristors are driven hard, i.e., the GTO is driven with a gate current configured in such a way that the turn-off gain IS/IGpeak is distinctly less than 3 so as to result in an anode voltage rise... | 03/24/1998 |
| 5631820 | Multiple DC, single AC converter with a switched DC transformer The invention is an improvement of the PASC inverter, wherein the improvements include the reduction from two shorting gates per transformer to one shorting gate per transformer and replacement of active control of the shorting gate with passive control o... | 05/20/1997 |
| 5579215 | Power conversion device with snubber energy regenerating circuit A power conversion device including a plurality of bridge connected self-turn-off modules. Each of the self-turn-off modules includes a plurality of self-turn-off devices connected in series and a plurality of first snubber circuits, each including a firs... | 11/26/1996 |
| 5544035 | Converter arrangement having a low-inductance commutation circuit A converter circuit arrangement is specified which is constructed to have a particularly low inductance. This is achieved by the circuit area of the commutation circuit being kept as small as possible. A circuit area which is as small as possible is achie... | 08/06/1996 |
| 5539631 | Converter circuits using a silicon controlled rectifier A voltage converter circuit uses a silicon-controlled rectifier for converting input voltage to selected levels of output voltage. The silicon-controlled rectifier is connected in a circuit including a capacitor which oscillates between charging and disch... | 07/23/1996 |
| 5418706 | Wide load matching capability power supply A high frequency power inverter comprises a power supply, a thyristor for switching the energy from the power supply to a load and a neutral capacitor for storing energy cyclically to assure reverse voltage is applied to the thyristor. A clamp circuit is ... | 05/23/1995 |
| 5250777 | Method and apparatus for variable phase induction heating and stirring In one embodiment, an induction furnace is disclosed having a crucible, first and second set of induction coils surrounding the crucible and master and slave inverters, whereas in another embodiment, related to a channel-type induction furnace, the lower ... | 10/05/1993 |
| 5237225 | Switching arrangement for an RF GTO A switching arrangement for an RF-GTO is specified. It comprises a latching-type semiconductor component (GTO) of familiar construction. The circuit for turning off the semiconductor component (GTO) is designed in such a manner that the turn-off gain I | 08/17/1993 |
| 5164892 | Pulse electric power unit A pulse electric power unit according to this invention performs a switching control of output current from a direct current power supply by means of an electronically-operated switch to thereby effect a voltage conversion for producing a voltage having t... | 11/17/1992 |
| 5150287 | Quarter-bridge circuit for high currents In a quarter-bridge circuit for high currents the total current is subdivided into a plurality of parallel current paths. In each current path a semiconductor component (5.1, . . . , 5.n, 6.1, . . . , 6.n) that can be turned off via a gate, a freewheeling... | 09/22/1992 |
| 5041960 | Frequency doubler and/or self-oscillating inverter An electrical circuit receives an alternating input signal and full-wave rectifies the alternating input signal. The rectified signal is then developed by the circuit into an output signal which has a frequency double the frequency of the alternating inpu... | 08/20/1991 |
| 4949233 | Power supply circuit in microwave ovens A power supply circuit for a high-frequency source (M) in a microwave oven includes a switched-mode-power-supply unit having a resonant circuit which contains a coil (L2) and a controllable switch (D1). The switching of the controllable switch is controll... | 08/14/1990 |
| 4862340 | DC power transmission system In a DC power transmission system wherein two AC systems are interconnected by a first converter, a DC transmission line and a second converter to transmit power from one of the AC systems to the other of the AC systems via the DC transmission line, the D... | 08/29/1989 |
| 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 |
| 4727468 | Digital PWM control circuit The PWM-controlled circuit includes an up/down counter and utilizes the fact that, when a numerical value is a complementary binary value, the sign is indicated by its most significant bit (sign bit). In the PWM control circuit, the up/down counter is con... | 02/23/1988 |
| 4723201 | Control apparatus for pulse width modulation inverters In a PWM inverter, a first three pulse mode, in which three voltage pulses exist within 120° in the electric angle of the inverter output voltage, is changed over to a single pulse mode, in which the pulse width is equal to 120°, through a second three ... | 02/02/1988 |
| 4686393 | Circuit breakers for direct and alternating current Circuit breakers which employ a capacitor to pass a current in opposition to a load current through a thyristor when interruption is required suffer from the disadvantage that high switching over-voltages occur. In the present invention current is diverte... | 08/11/1987 |
| 4670830 | Method and apparatus for the protection of converter equipment with GTO thyristors against short circuit In order to protect converter equipment which includes GTO switching-off thyristors and having d-c inputs and a protective inductance connected in series therewith against short circuit currents, a short circuit path for d-c current flowing from a d-c sup... | 06/02/1987 |
| 4453068 | Induction cook-top system and control An induction heating system (40) is provided and includes a plurality of induction heating coils (118). Touch control pads (50, 52, 70, 72) are provided together with circuitry (80) for generating energization control signals. Circuitry (112, 116) is prov... | 06/05/1984 |
| 4442483 | Resonant circuit inverter A resonant circuit inverter has an LC series resonant circuit and a switching device for connecting the resonant circuit with periodically alternating polarity to a dc voltage source, the switching device feeding a high voltage transformer. The resonant c... | 04/10/1984 |
| 4429205 | Induction heating apparatus An induction heating apparatus which includes an induction coil with an associated load and a resonant inverter circuit coupled to a DC power supply for energizing the heating coil. The inverter circuit includes a gate controlled thyristor which is cyclic... | 01/31/1984 |
| 4424558 | Freely commutating chopper circuit The invention relates to a chopper circuit with free commutation for the supply of power to a load from a source of direct current. It comprises a principal thyristor with a return diode, a series resonant circuit as the commutation circuit and a free-whe... | 01/03/1984 |
| 4415963 | FET commutated current-FED inverter A shunt switch comprised of a field-effect transistor (Q1) is employed to commutate a current-fed inverter (10) using thyristors (SCR1, SCR2) or bijunction transistors (Q2, Q3) in a full bridge (1, 2, 3, 4) or half bridge ... | 11/15/1983 |
| 4409647 | Power converter using a resonant circuit A power converter which converts alternating current (AC) utility power or direct current (DC) power to any DC output voltage by use of at least one switch and a resonant circuit resulting in power conversion by means of sinusoidal waveshapes. The resonan... | 10/11/1983 |
| 4386395 | Power supply for electrostatic apparatus A power supply for electrostatic apparatus provides a high voltage output. The high voltage output is provided by the half wave rectification and filtering of a pulse signal from a secondary winding of a high voltage pulse transformer. The primary winding... | 05/31/1983 |
| 4376250 | Portable power source An apparatus providing a source of alternating power for power devices is disclosed. The apparatus comprises a frame member having a plurality of ground engaging wheels for transporting the frame member along the ground. The frame member carries a plurali... | 03/08/1983 |
