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7622886 |
Method for determination of the risk to disturbance-free operation of a frequency converter
The invention relates to a method for determining the chance of a disturbance-free operation of a frequency converter ( 2 ) connected to a feeding network ( 18 ). According to the invention, during...
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7622823 |
Uninterruptible power supply with low leakage current
An uninterruptible power supply having a controllable leakage current is disclosed. The leakage current is controlled by adjusting a switching speed (i.e., dV/dt rate) of switches in the output...
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7619907 |
DC/DC power conversion device
A DC/DC power conversion device includes n-stage circuits comprised of an inverter circuit for driving which is connected between positive terminals and negative terminals of smoothing capacitors,...
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7612514 |
Architecture and a multiple function power converter for aircraft
A method and apparatuses are implemented for electric power systems. An apparatus for power conversion according to one embodiment comprises: a multiple function power converter ( 77 ), the...
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7609022 |
Power supply system for vehicle with improved energy efficiency and vehicle including the same
A matrix converter ( 38 ) converts three-phase AC power input from a first motor-generator (MG 1 ) directly to three-phase AC power for driving a second motor-generator (MG 2 ) and outputs the...
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7602622 |
Compensator with filter for use with a three-phase drive powering a one-phase load
The present invention is directed to a compensator-filter circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system...
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7599200 |
Electric power converter
In an electric power converter, a main circuit unit and a control unit are detachably attached to each other, and another control unit differing in a control manner can be newly attached to the...
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7593244 |
Limit for the harmonics of a current
A wiring arrangement and an appliance for limiting the harmonics of a current supplied to a frequency converter from an AC electricity supply network, which frequency converter can be connected to...
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7586763 |
Electric power converter circuit
An electric power converter circuit includes a rectifying circuit having diodes, a coil, and a full-bridge circuit including switching devices, which are connected in cascade to an AC power supply ...
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7573732 |
Protective circuit and method for multi-level converter
A protective circuit for a multi-level converter including a DC link capacitor bank includes: an energy absorbing element; switches, wherein at least two of the switches each couple the energy...
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7567446 |
Power conversion apparatus including a rectifier circuit and an inverter circuit
A power conversion apparatus is disclosed. In the case where a coil is arranged in a power module, the circuit system between the ends of the coil in the power module, regardless of where the coil...
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7566232 |
Bidirectional DC/AC inverter
A bidirectional DC/AC inverter includes a power conversion means in connection with an electric storage means, a control means operable to control an operation of the power conversion means, a plug...
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7564703 |
Method and apparatus for synchronized parallel operation of PWM inverters with limited circulating current
An apparatus and method for converting DC voltage across positive and negative DC buses to three phase AC voltages on first, second and third AC output lines, the method comprising the steps of...
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7558091 |
Switching power supply apparatus
The switching power supply apparatus includes detection means for detecting that leak current of an input smoothing capacitor becomes a predetermined value or more and first auxiliary switching...
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7558090 |
System for transferring an alternating voltage into a direct voltage
A system for transferring an alternating voltage into a direct voltage includes a rectifier, a filter, a transformer, a switch, a switch control circuit and a voltage feedback circuit. The...
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7545655 |
Inverter apparatus
An inverter apparatus in which a control power source connected to a microcomputer or a peripheral circuit included in at least one of an inverter main body, a built-in option, and a parameter unit...
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7539029 |
3-phase solar converter circuit and method
A conversion circuit for converting solar power into an alternating 3-phase mains comprises a converter for converting the power from a solar cell into an unipolar converter output voltage provided...
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7535737 |
AC/AC multiple-phase power converter configured to be mounted on a substrate
An arrangement is provided a converter, an inverter, a smoothing condenser connected between the converter and the inverter, and reactors each connected between the connection point of each pair of...
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7532445 |
Transient voltage clamping circuit
A circuit for transient voltage clamping, the circuit being internal to a motor driver ASIC for a hard drive and including a power transistor for sinking a power supply voltage subjected to...
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7525824 |
Method to control a frequency converter
A method for the control of a static frequency converter, in which an alternating voltage provided by a generator with a first frequency is first rectified in a switched rectifier, and in which the...
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7525278 |
Voltage conversion apparatus, power output apparatus, and control method of voltage converter
An upper limit value setting unit of a control device conducts integration on the change in battery power, and determines whether the integrated value is lower than a preset first threshold value...
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7518890 |
AC/DC/AC converter with reduced inductance in the DC filter capacitors
A frequency converter in which the inductance is reduced by enlarging the forms of bus bars which connect a P phase, an N phase of an inverter part and a positive electrode or a negative electrode...
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7511447 |
Motor drive apparatus
When a torque command value from an external ECU is within a predetermined variation width, a control unit generates a signal and outputs the signal to a voltage command calculation unit so that...
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7511250 |
Transport system
In order to provide a transport system with a conductor system, which includes at least one supply conductor, which is connected to an energy source, at least one transport carriage movable along a...
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7508685 |
Stabilized power supply
A stabilized power supply for X-ray tubes having a first rectifier circuit, an inverter circuit comprising main switches, a transformer, a second rectifier circuit an oscillation circuit and an...
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7505291 |
AC/DC converter capable of actively restraining an inrush current
An AC/DC converter includes a rectifier circuit, at least one restraining unit, and a power interruption detection circuit. The rectifier circuit is used for converting an AC (alternating current)...
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7502238 |
Rectifier for reducing current harmonics from unbalanced source
A rectifier includes a transformer, a rectifying bridge, a link capacitor, and at least a first resonance loop. The transformer is operable to receive three phase input signals having a source...
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7502233 |
DC power supply using either AC or DC input for both
There is provided a power supply for AC/DC and DC/DC conversion which receives the DC power supplied from airplanes, vehicles and vessels as well as normal AC power, and converts the power to DC...
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7500118 |
Network device with power potential rectifier
In a network device, a power potential rectifier is adapted to conductively couple a network connector to an integrated circuit that rectifies and passes a power signal and data signal received...
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7499297 |
Low-harmonics, polyphase converter circuit
A polyphase converter circuit having p≧3 phases (R, Y, B) and a converter circuit element provided for each phase (R, Y, B) is specified, each converter circuit element having a rectifier unit, a...
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7499296 |
Electric power converter device with control means and process and converting power
An electric power converter with a control device that comprises a processing unit receives control signals and sends modulated signals to inverter stages of the electric power converter. The...
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7499291 |
DC power transmission system of voltage source converter using pulse-interleaving auxiliary circuit
A DC power transmission system of a voltage source converter using a pulse-interleaving auxiliary circuit is disclosed. The converter system comprises an IGBT converter for converting an AC power...
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7495410 |
Systems and methods for improved motor drive power factor control
Systems and methods are described for controlling power factor in motor drives having a switching rectifier providing a DC link current to an inverter in which the rectifier gain is increased to...
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7489532 |
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit are proposed. A voltage divider and a feedback unit output a compensation voltage and a...
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7477531 |
Compensation circuit for use with a three-phase drive powering a single-phase load
A compensator circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage...
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7471525 |
Converter and power converter that becomes it with the converter
A converter includes a converter circuit 1 having a plurality of bridge-connected semiconductor switching devices for converting AC power into DC power, a smoothing condenser connected in...
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7471004 |
Driving/electric-power generating system for vehicle
An AC generator comprises a rotor and a stator having a three-phase winding. A three-phase inverter is connected to the three-phase winding. Here, the three-phase winding comprises at least two...
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7466083 |
Protective device for vehicle electronic apparatus
A protective device for a vehicle electronic apparatus, which includes an inverter for converting a direct-current voltage into an alternating-current voltage for the vehicle electronic apparatus,...
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7463500 |
Monopolar DC to bipolar DC to AC converter
An electrical DC-to-AC power conversion apparatus is disclosed that is primarily intended for use with solar photovoltaic sources in electric utility grid-interactive applications. The invention...
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7457136 |
Overcurrent protective device for switching element
An overcurrent protective device has a current detecting section and a control section. The current detecting section detects the amount of a current flowing through switching elements of an...
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7450408 |
Integrated converter having three-phase power factor correction
An integrated converter having three-phase power factor correction is provided. The integrated converter includes two PFC circuits. Two DC/DC converters are controlled and switched by the...
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7436147 |
Motor driving apparatus
A motor driving apparatus drives a motor by means of an AC/AC direct converter such as a matrix converter. The motor driving apparatus is provided with a current detecting section for detecting...
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7433212 |
System linking apparatus for generated electric power
A system linking apparatus for generated electric power which may be made smaller and more efficient. The system linking apparatus is intended for connecting an electric power system to an output...
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7430132 |
Medium voltage inverter system
A medium or high voltage multi-inverter system is described, in which multiple inverter cells are included in a phase line to increase the voltage level supported by the system, and support higher...
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7428157 |
Apparatus and method for virtually shielding a synchronous switching regulator
Virtual shielding is used to reduce the sources/origins of latchup and switching noise in a synchronous switching regulator. The regulator power stage may be split into two half stages. The ground...
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7408791 |
Frequency converter assembly and method of using frequency converter assembly
A frequency converter assembly comprising a direct-voltage circuit and brake chopper means, the direct-voltage circuit including a first branch (DC+) and a second branch (DC−), and the brake...
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7403403 |
Noise suppressor
A noise suppressor capable of preventing degradation in an attenuation characteristic by a parasitic component so as to obtain a favorable attenuation characteristic is provided. The noise...
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7403399 |
Active primary-sided circuit arrangement for a switch-mode power supply
The invention under consideration refers to a circuit arrangement for a switch-mode power supply, wherein the switch-mode power supply has a primary side, which can be connected to a supply...
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7400102 |
Method for controlling a polyphase voltage inverter
The present invention relates to a method for controlling a polyphase voltage inverter the inverter being designed to control a load in terms of pulse width modulation and to be connected upstream...
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7391132 |
Methods and apparatus providing double conversion/series-parallel hybrid operation in uninterruptible power supplies
An uninterruptible power supply (UPS) includes an AC power source, a DC power source coupled to a DC bus, a load, a converter, an inverter and a controller. Responsive to the controller, the...
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