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5933331 Battery coupling apparatus  
An apparatus for coupling a battery to a mains-powered Sc link circuit of a converter. The this apparatus has two capacitors and two converter bridge arms which are each connected electrically in...
5923547 Snubber circuit for a power converter and method of operation thereof  
For use with a power converter having a switching circuit coupled to a primary winding of a transformer and a rectifier coupled to a secondary winding of the transformer, the switching circuit...
5920473 Dc-to-Dc power converter with integrated magnetic power transformer  
A dc-to-dc power converter for delivering continuous and controlled power to a load includes first and second controllable switching devices having a junction therebetween. Each of the first and...
5920472 High voltage converter circuit  
A power supply apparatus for a drive unit in a high voltage converter circuit, the circuit has a plurality of power semiconductors connected in series. Each power semiconductor is connected to a...
5917722 Controlled commutator circuit  
A commutator circuit includes a bridge (1), which may have a half-bridge or a full-bridge topology, and a switch resonant arm (3, L, C). The resonant arm is coupled to the midpoint of the bridge,...
5912545 System and methods using a motor drive circuit to both drive a battery operated motor and to recharge the battery  
A battery-operated motor system includes a rechargeable battery, a motor and circuitry for recharging the battery. The recharging circuit processes externally applied energy to provide a source of...
5910892 High power motor drive converter system and modulation control  
A high power motor drive converter includes a three level neutral point clamped (NPC) output power conversion stage including switches; a split series connected DC capacitor bank coupled in...
5907483 Control system for power conversion system  
A control system for a power conversion system, composed of at least one voltage source type converter and a transformer. The control system includes, a circuit for detecting line-to-line voltages...
5905646 Power modulator  
The invention relates to a power modulator of pulse transformer type. The pulse transformer includes at least one secondary winding and a number of primary windings. The primary windings share a...
5898585 Apparatus and method for providing supplemental alternating current from a solar cell array  
A novel solar inverter circuit is used to connect a solar photovoltaic (PV) array with an alternating current (AC) voltage source to convert direct current (DC) power from the PV array to AC power....
5898581 Active snubber for buck-based converters and method of operation thereof  
For use with a buck-based converter having an isolation transformer, a snubber circuit and a method of damping a transient in the power rectifying diode due to its reverse recovery. In one...
5896282 Inverter circuit and integrated uninterruptible power supply protection system  
An uninterruptible power supply (UPS) system comprising an inverter for converting a DC voltage into an AC voltage comprising a full-bridge circuit having four silicon controlled rectifier (SCR)...
5896287 Bridge-type direct current boost converter for driving a capacitive load  
A direct current boost converter which has a simple structure using only one coil, and which can apply a driving voltage to a capacitive load which reciprocates in polarity is discussed. A first...
5896285 Apparatus for interconnection in voltage-stiff converter devices  
An apparatus for interconnection in a voltage-stiff converter is provided. The converter has at least one phase leg with at least two current valves. The apparatus connects a current valve with a...
5894412 System with open-loop DC-DC converter stage  
Innovative systems and methods for advantageous use of a new isolated power converter topology, in which transformer isolation is provided by a very simple DC-DC converter operated in open-loop...
5880950 Inverter driving circuit for brushless d.c. motor  
This invention provides an inverter driving circuit for brushless d.c. motor adapted to pass PWM signal to switching elements of the inverter, enabling reduction of the manufacturing cost, the...
5877947 Snubber circuit for a rectifier and method of operation thereof  
For use in a power converter having a rectifier coupled to an output thereof, a snubber circuit including an energy storage device coupled to the rectifier that moderates a voltage across the...
5877950 Device for measuring currents in a converter  
This invention relates to a device for measuring currents used in a converter (1) powered by a DC power source and equipped with six switches (T1, T2, T3, T4, T5, T6) associated with diodes (D1,...
5877951 Circuit for and method of decreasing conducted and radiated electromagnetic interference of a power converter and a full bridge power converter employing the same  
For use in a power converter having a controlled full bridge coupled to a transformer, the bridge delivering power received from an input of the power converter to a primary winding of the...
5875107 Inverter apparatus  
After a DC voltage outputted from a rectifying circuit 2 is smoothed by a smoothing capacitor 3, transistors 4 and 5 are turned ON/OFF so as to convert the smoothed DC voltage into high frequency...
5875106 Galvanic decoupling supply unit for an electric vehicle  
A supply unit including a direct voltage energy source formed of a number of rechargeable batteries; an electric motor for driving the vehicle; and an electric circuit interposed between the direct...
5872703 System and method for regulating power in tank circuits having a bridge configuration  
A system for regulating an alternating current voltage source has a pair of P-channel MOSFETs and a pair of N-channel MOSFETs in a bridge configuration with an inductor-capacitor tank there...
5872707 SVC converter with an extra phase leg to replace a failed phase leg  
A plant for transmitting electric power having an alternating voltage network with at least one phase and at least one VSC converter is provided. The converter has at least one phase leg with two...
5870298 Power converter with a loop-compensated filter  
A power converter with a loop-compensated filter is disclosed. The power converter includes a decoupling circuit coupled to receive a signal having a dc component and a ripple component, wherein...
5870300 Voltage converter having a commutation circuit with reduced inductance  
A VSC converter has each current valve of a phase leg formed by a plurality of units of semiconductor elements and rectifying members, located on top of each other forming at least one stack. The...
5867373 Switched-mode power supply  
The invention relates to a switched-mode power supply having a switching transistor which periodically switches through a voltage which is applied to a primary winding of a transformer, having a...
5867376 DC magnetization suppression in power converter transformers  
A power converting apparatus includes a power converter connected to a power line via a transformer 3, and current detectors 5A and 5B for detecting the currents of the windings of the transformer....
5864471 Energy recovery circuit for use in a converter  
A full-bridge converter circuit which implements an energy recovery circuit. The energy recovery circuit provides clamping of an output diode reverse voltage to a primary bank voltage of an...
5864477 Converter circuit for a polyphase switched inductive load  
A converter circuit for an inductive load, such as the phase windings of a switched reluctance motor, uses only n-switches for n-phases. In a four phase machine, each of three of the phases is...
5859769 Piloting system for electric inverter  
The MOSFETs or IGBTs of respective arms of an electronic inverter are in series with SCRs or TRIACs triggered into conduction during intervals of intended conduction of the respective MOSFETs or...
5859770 Output circuit for PWM inverter with no floating state  
An output circuit for a PWM inverter is provided which has an N-type first power device and a P-type second power device. Gates of the first and second power devices are connected to each other....
5859771 Half/full bridge converter  
Known converters for converting a d.c. voltage at their input to a rectifiable a.c. voltage at the output operate reliably with very small input voltage fluctuations and relatively small...
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...
5852558 Method and apparatus for reducing common mode voltage in multi-phase power converters  
Multi-phase power is provided to a load via the use of an inverter which has an even number of inverter legs. DC source voltage, such as from an AC-to-DC converter receiving power from a main AC...
5841644 Passively clamped quasi-resonant DC link converters  
A passively clamped quasi-resonant DC link ("PCQRL") converter includes an output inverter having a plurality of switches, and a DC link between a DC power source and the output inverter. The DC...
5841647 Power conversion system  
A power conversion system including, a series circuit of an upper arm and a lower arm connected between a positive terminal and a negative terminal of a DC power source. Each of the upper and lower...
5841649 Current-sensing mosfets in paralleled mosfet power circuit  
Six sets of parallel-connected MOSFETs are gated to provide a 3-phase output. At least one of the MOSFETs in each of three sets of the six sets has a separately metallized current-sensing pad. The...
5841646 Resonance inverter power supply control device including transistor switch-over decision signals  
In a device for the control of a circuit comprising a resonance inverter power supply for at least one load comprising an inductive component, the inverter power supply comprises at least two...
5841645 Multi-level inverter with low loss snubbing circuits  
A multi-level inverter, including an AC output terminal, at least four DC input terminals with different potentials having a first DC input terminal with a maximum potential and a second DC input...
5835371 Bridge type power converter  
A bridge-type power converter has, in each phase, a inductor (L1) connected between a connection point of said two switching elements (Q1, Q2) and an output terminal; capacitors (C1, C2) connected...
5828559 Soft switching active snubber  
A soft switching device for electric power switching applications includes a switching element and a soft switching active snubber. The soft switching active snubber includes a capacitor, a...
5818180 Voice coil motor feedback control circuit  
A circuit for driving a voice coil motor used to position the heads of a disk drive is disclosed. The circuit consists of a an H-bridge circuit, a controller, and a feedback loop. The feedback loop...
5815391 Current sensing circuit for pulse width modulated motor drive  
Inverter-switch currents are sensed using a conventional a-c current transformer whose primary winding is connected to the inverter-switch and whose secondary winding is connected to a...
5815381 Single-barrier closed loop DC-to-DC converter and method  
A DC to DC converter repeatedly divides a first digital signal (26) into 8 time frames, and repeatedly generates a second digital signal (VS) during one of the 8 time frames. A DC input signal...
5808884 Circuit and method for conserving energy in a boost regulator circuit  
A boost regulator circuit includes a rechargeable power supply Vcc, an energy storage component 22 coupled to the rechargeable power supply, a load CL, and a bi-directional drive means (S1-S6, 20...
5805438 Current controlled PWM inverter for driving a motor without gain adjustment  
A low-cost, completely adjustment-free current-controlled PWM inverter substantially solving the conventional problems associated with the gain adjustment of a current error amplifier is provided....
5801936 Semiconductor module for a power conversion device  
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second...
5793621 Switching power supply for computer-driven displays or the like  
A power supply system has a switching element to be turned on and off for d.c. to d.c. conversion of a unidirectional supply voltage in synchronism with horizontal synchronizing pulses used for...
5784270 Method of controlling an H-bridge  
Controlling an H-bridge of switches, characterized in that during a cycle, the current takes a peak value of constant sign during a continuous portion corresponding to a cycle fraction equal to...
5780975 Low cost inverter with both discrete and integrated power switches  
An inverter for powering an electroluminescent lamp includes a supply terminal, a ground terminal, a first switching transistor, an inductor, and a second switcing transistor connected in series...