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| Number | Title | Issue Date |
| 7843711 | Switching transistor driver circuit controlling power supply to the load Of a pair of switching transistors connected in series between a high voltage power source and the ground, when the switching transistor on the high potential side is controlled by an RS flip-flop in response to an input signal, in order to prevent a malfunction cau... | 11/30/2010 |
| 7791912 | Protection method, system and apparatus for a power converter Among many embodiments, a power converter and a method for operating a power converter are disclosed. The power converter may include a pair of switches connected in series, an output transformer connected to a common node between the switches and a protection appar... | 09/07/2010 |
| 7626838 | Inverter circuit with switching deadtime synchronized sample and hold current detection In an inverter circuit including switching devices and diodes connected in parallel with the switching devices which are provided in pairs of upper and lower arms, and also including resistances for detecting phase currents in a motor connected to the lower arms, du... | 12/01/2009 |
| 7397675 | Inverter-filter non-linearity blanking time and zero current clamping compensation system and method Inverter-filter non-linearity blanking time and zero current clamping compensation is accomplished by comparing the average output current with the discontinuous current mode threshold values to determine when the average output current is entering a discontinuous c... | 07/08/2008 |
| 7313006 | Shoot-through prevention circuit for passive level-shifter A shoot-through prevention circuit is used in a power conversion circuit that uses a passive level-shifter to drive a P-type transistor in a switching network. The shoot-through prevention circuit is coupled between a controller output that provides a driving signal... | 12/25/2007 |
| 7286375 | Dead-time compensation method for electric drives Methods and apparatus are provided for compensating for a deviation in voltage output of a phase leg inverter when dead-time periods are inserted to prevent shoot-through failures. The method includes determining a pulse width for an input signal to the inverter suc... | 10/23/2007 |
| 7236003 | H-bridge circuit with shoot through current prevention during power-up The H-bridge circuit with shoot through current prevention during power-up includes: a high side transistor; a low side transistor coupled in series with the high side transistor; pull down devices coupled to a control node of the high side transistor and to a contr... | 06/26/2007 |
| 7190225 | Efficient low EMI switching output stages and methods Efficient low EMI switching output stages and methods that may be used, by way of example, in class D amplifiers. The output stages comprise class AB output stages having complementary FETs for the output. The FETs are switched in response to a switch control signal... | 03/13/2007 |
| 7126304 | Motor controller and electric power steering apparatus A microcomputer includes a rotation angular velocity computation section, a feedback gain determination section, and a dead time compensation amount determination section. The rotation angular velocity determination section computes the rotation angular velocity of ... | 10/24/2006 |
| 7110272 | Inverter bridge controller implementing short-circuit protection scheme A fault handling system for short circuit recovery in three-phase multiple-level inverter bridges, used to drive inductive loads, which waits for either desaturation of switches or expiration of a delay period based upon an amount of time before saturated switches a... | 09/19/2006 |
| 7088601 | Power conversion apparatus and methods using DC bus shifting A power converter apparatus, such as a double-conversion or line-interactive UPS, includes first and second DC voltage busses and a polyphase DC to AC converter circuit coupled to the first and second DC voltage busses and operative to generate a polyphase AC output... | 08/08/2006 |
| 7054174 | Series power switch bridge having the ability of automatic voltage-sharing A series power switch bridge having the ability of automatic voltage-sharing, which belongs to the field of electric controlling equipments. It consists of a power switch bridge and a dynamic-static voltage-sharing absorption circuit (DRwC) bridge. The very power sw... | 05/30/2006 |
| 7038332 | Power discriminating systems The present invention relates to a control system for selectively supplying electrical power in a remote environment. The system comprises a plurality of electrical circuits, each designed to operate over a unique frequency passband. Power transmitted within the fre... | 05/02/2006 |
| 7034479 | Digital interface for driving at least a couple of power elements, in particular in PWM applications A digital interface for driving at least one complementary pair of first and second power elements connected in an inverter configuration between first and second voltage references is provided. The digital interface includes a first input terminal for receiving a P... | 04/25/2006 |
| 6927988 | Method and apparatus for measuring fault diagnostics on insulated gate bipolar transistor converter circuits A method for diagnosing faults using a load. In the method IGBTs are controlled such that certain currents are expected. If the currents are not as expected, a fault may be diagnosed. ... | 08/09/2005 |
| 6909620 | Inverter configurations with shoot-through immunity An inverter phase leg with shoot-through protection that may be used in inverters includes a high side semiconductor switch and a low side semiconductor switch which are connected across DC supply lines and which have an output node between them. A series diode or c... | 06/21/2005 |
| 6909619 | Spike control apparatus for DC-DC converter There are disclosed a synchronous rectifying type of DC—DC converter, a DC—DC converter control circuit constituting such a type of DC—DC converter, a monitor circuit for monitoring an operation of a DC—DC converter, and an electronic equipment having a DCâ€... | 06/21/2005 |
| 6842352 | Inverter module for train traction systems An inverter module for an electric railcar includes an inverter composed of three 2 in 1 IGBTs, a breaker composed of semiconductor line breaker, and a dry filter capacitor, wherein one inverter corresponds to a single motor. The inverter is a snubberless inverter o... | 01/11/2005 |
| 6813169 | Inverter device capable of reducing through current A first transistor is turned on when an H-level signal is input. A power supply voltage is applied to a gate electrode of a first switching element to charge a miller capacitance of the first switching element. As a result, gate voltage of the first switching elemen... | 11/02/2004 |
| 6545886 | Power conditioning for model railroad control decoders New techniques are presented for increased power handling capability for model railroad decoders and other attached electronics when space and cooling limitations exist. Additionally, novel usage of existing electronic voltage measurements permit an impro... | 04/08/2003 |
| 6515840 | Solid state circuit breaker with current overshoot protection A solid state circuit breaker is disclosed for use in connection with a voltage bus, the voltage bus supplying electrical current to a load. The solid state circuit breaker includes a current controller for controlling the magnitude of current supplied by... | 02/04/2003 |
| 6477068 | Apparatus and method for controlling DC power to primary and secondary load utilizing capacitor An apparatus for supplying and controlling electrical power having a power source for supplying electrical power to a primary load and a secondary load, a capacitor connected to an input to the secondary load and control means operable to cause an operati... | 11/05/2002 |
| 6438004 | Power conversion apparatus utilizing soft switching resonant snubber circuitry The present invention discloses a power conversion apparatus comprising a control circuit for generating a switching signal at the timing allowing soft-switching to be achieved, and free from any occurrence of ripple. The power conversion apparatus includes a ... | 08/20/2002 |
| 6201716 | Controller of power supplying apparatus with short circuit preventing means The controller of power supplying apparatus, upon outputting of a timing signal from a timer, brings a switching element, which is in the conductive state, into the non-conductive state and, in the meantime, brings a switching element, which is in the non... | 03/13/2001 |
| 6198263 | Power MOSFET switching dead time control method and apparatus A dead time regulating apparatus is used in a switch mode power system. The apparatus, comprises a power MOSFET circuit with PMOS and NMOS devices. Driving means is connected for driving and for turning-on a delay in the MOSFETs. A time delay detecting me... | 03/06/2001 |
| 6157556 | Switched inverter circuit providing increased short circuit protection An inverter inputs sinusoidal currents into an alternating current network. The inverter reduces the risk of short circuiting. One switching unit is used to generate a semi-oscillation of a sinusoidal oscillation. In order to generate a positive semi-osci... | 12/05/2000 |
| 6081435 | Cross-conduction limiting circuit, method of operation thereof and DC/DC converter employing the same For use in a power converter including first and second controllable switches coupled in series across an input, the switches are also coupled to a power transformer, a cross-conduction limiting circuit for, and method of, limiting cross-conduction curren... | 06/27/2000 |
| 5991176 | Method for processing PWM waves and devices therefor A method for processing PWM waves for a voltage inverter or a voltage-controlled rectifier, including at least one pair of switches, said inverter or rectifier being controlled by a modulator and a discriminator. According to the method, two set waves cor... | 11/23/1999 |
| 5953222 | Neutral point clamped converter A switching module, including a first self-turn-off device, a second self-turn-off device connected in series with the first self-turn-off device, a first diode connected in antiparallel with the first self-turn-off device, a second diode connected in ant... | 09/14/1999 |
| 5933341 | Power converting apparatus A power converting apparatus is comprised of an inverter unit arranged by a switching semiconductor element 51a for an upper arm and another switching semiconductor element 51d for a lower arm, and for turning ON/OFF the switching semiconductor elements t... | 08/03/1999 |
| 5930132 | Semiconductor device, and method and apparatus for reducing a dead time in PWM inverter In a PWM inverter having a two-arm structure of upper and lower arms, the dead time is reduced to a minimum for improving the controlling accuracy and linearity under a very small rate of the inverter power output. Also, in the PWM control on a motor, the... | 07/27/1999 |
| 5859519 | Single phase motor drive A motor having a stationary assembly including a winding and a rotatable assembly in magnetic coupling relation to the stationary assembly. A bridge circuit for use in driving the motor has upper and lower power switches connected between the winding and ... | 01/12/1999 |
| 5604670 | Power converting apparatus and control device for a power converting apparatus A power converting apparatus comprises a converter, a control device, and a protection device. The converter has first and second semiconductor devices coupled in series. The control device outputs a plurality of control signals for switching on the first... | 02/18/1997 |
| 5309347 | H-bridge circuit with protection against crossover conduction An H-bridge circuit which includes four power transistors (an npn pull-down and a pnp pull-up for each of the output terminals). Two control circuits are connected to drive these transistors in a complementary crossover configuration, so that each control... | 05/03/1994 |
| 5227961 | Symmetrical delay circuit Dead time circuitry for ensuring that no two switching devices in a half-bridge, or in the same leg of a full-bridge, are conductive simultaneously employs a symmetrical delay circuit which independently delays the rising and falling edges of each signal ... | 07/13/1993 |
| 5159515 | Protection circuit for power FETs in a half-bridge circuit A small size FET has its drain connected to the gate of a high-side power FET of an N-channel half-bridge circuit and its gate connected to the gate of the low-side power FET of the half-bridge circuit. The source of the small FET is connected to ground. ... | 10/27/1992 |
| 5111378 | DC chopper converter A DC chopper converter including four switching elements arranged in a four-arm or an H-bridge configuration between power supply terminals and on opposite sides of a load, each switching element having a free-wheeling diode connected parallel thereto, wh... | 05/05/1992 |
| 5105099 | Level shift circuit with common mode rejection A system includes an upper driver circuit connected between a first source of voltage and a first point of reference potential, for driving the gate of a first switching device having a main current path connected between a second source of operating volt... | 04/14/1992 |
| 5099408 | System for controlling a PWM inverter having delay time compensation A system is provided for controlling a PWM inverter having three main circuit arms in which free-wheel diodes are connected in parallel to positive and negative side switching elements. The inverter takes three phase alternating current from an intermedia... | 03/24/1992 |
| 4989127 | Driver for high voltage half-bridge circuits A driver circuit for a high voltage switching power transistor has a first stage connected to the power transistor control terminal for turning the power transistor on and off, and a second stage connected to the power transistor control terminal acting a... | 01/29/1991 |
