Abstract: Electrical current transducer (2) of a closed-loop type for measuring a primary current (IP) flowing in a primary conductor (1), comprising a fluxgate measuring head (7) and an electronic circuit (16) including a microprocessor (18) for digital signal processing. The measuring head includes a secondary coil (6) and a fluxgate detector (4) comprising an excitation coil and a magnetic material core. The electronic circuit comprises an excitation coil drive circuit (14) configured to generate an alternating excitation voltage to supply the excitation coil with an alternating excitation current (Ifx), the secondary coil (6) connected in a feedback loop (12) of the electronic circuit to the excitation coil drive circuit (14), the electronic circuit further comprising a ripple compensation circuit (26, 28) configured to compensate for a ripple signal generated by the alternating excitation voltage.

Abstract: A method predicts a voltage collapse in a micro-grid connected to a power distribution network by measuring states at a point of common coupling of the micro-grid, and a connected bus of the power distribution network connected to the micro-grid through a connection link. Then, it is determined whether a reactive power generation limit of the micro-grid is reached based on the states, and if no, repeating the measuring, and otherwise determining parameters of the connection link using the measurements. A static voltage stability margin index is determined, and a voltage stability margin index is predicted using the static voltage stability margin index and a forecast of future load variations in the micro-grid. Then, it is determined whether the voltage stability margin index is smaller than a threshold, and if no, repeating the measuring, determining and predicting steps, and otherwise if yes, signaling a control action indicating the voltage collapse.

Abstract: Disclosed examples include methods, power converters and damping circuits to control damping of an input filter circuit, in which a low-voltage secondary winding is wound around a common core with a primary winding connected between an AC input and a rectifier input of the converter, where the secondary winding is coupled in a series circuit with a damping resistor and a switch, and a controller selectively closes the switch with a controlled on-time at system power up and/or in response to detection of oscillation or transients in the power converter.

Abstract: The disclosure discloses a printer including a load circuit, a controller, a power receiving terminal, a first switching circuit, and a second switching circuit. The controller is configured to control voltage supply to the load circuit, and is connected to an input part. The power receiving terminal is configured to be connected to a power feeding terminal of an external power source device. The first switching circuit includes a first switch element configured to switch between conduction and interruption in accordance with a first control signal input from the controller, and is connected between the power receiving terminal and the input part. The second switching circuit includes a second switch element configured to switch between conduction and interruption in accordance with a second control signal input from the controller, and is connected between the battery storage part and the input part.

Abstract: According to one embodiment, a radio communication device 1 includes a variable frequency divider 17 that divides a frequency of a reference clock REFCLK and outputs a frequency divided clock DCLK; a controller 15 that controls a frequency dividing ratio of the variable frequency divider 17 so that an integral multiple of a frequency of the frequency divided clock DCLK is not included in a frequency band of a high-frequency signal that has been received from outside by radio; and a DCDC converter 18 that performs a switching operation in synchronization with the frequency divided clock DCLK to generate an output voltage Vout obtained by stepping down an input voltage Vin.

Abstract: In a power converter, a housing is grounded. A power converter circuit is installed in the housing and configured to perform power conversion of input power into output power. An external terminal is electrically connected to the power converter circuit for connection of an external device to the power converter circuit. A first capacitor has first and second electrodes. The first electrode of the first capacitor is connected to the external terminal, and the second electrode thereof is connected to the housing. A second capacitor has first and second electrodes. The first electrode of the second capacitor is connected to the external terminal, and the second electrode thereof is connected to the housing. The first capacitor, the external terminal, the second capacitor, and the housing is arranged to provide a conductive loop.

Abstract: A circuit arrangement with an interference protection is disclosed, including a supply line and a ground line, a first circuit and a second circuit. Each of the first and second circuit is connected to the supply line and to the ground line. The circuit arrangement also includes a blocking device coupled to at least the supply line to suppress any interfering signals from being applied to the supply line.

Abstract: A power converter for operating a three-phase AC electrical machine from a single phase AC power source includes an ASD having a rectifier and inverter, and an add-on power conversion module external to the ASD that is electrically connected to each of the power source and the ASD. The power conversion module includes one or more input inductors configured to store and filter single-phase AC power received from the power source and a pair of switching devices connected to each of the input inductors at an output end thereof. A controller operably connected to the power conversion module selectively controls switching of the pair of switching devices associated with each of the one or more input inductors so as to cause a sinusoidal single phase AC power to be output from the add-on power conversion module for rectification by the rectifier.

Abstract: The invention relates to a method (40) for controlling an inverter (10) using space-vector pulse width modulation, in particular to control an electric machine (14), said inverter (10) being equipped with a plurality of controllable switches (S) and a corresponding plurality of freewheeling diodes (D) and being designed to provide a polyphase electric current (IU, IV, IW) and a polyphase voltage in the form of current space vectors (I*, U*), in particular to supply polyphase electric current (IU, IV, IW) to the electric machine (14).

Abstract: A filter for filtering a three-phase electrical power waveform produces a three-phase output power waveform. The filter has an inductor with three sets of first and second coils, each having a capacitor connected in series therewith. Each of the three sets of first and second coils has a tap intermediate the first and second coils where the output waveform is present, each tap capable of being connected to a load. In some embodiments, the inductor is passive adaptive and includes resistors for reducing current in-rush.

Abstract: A common mode noise sensor with a single amplification path is disclosed. The common mode noise sensor includes first and second terminals for receiving respective first and second signals from a power supply, an amplifier stage connected to the first and second terminals and having an output and a resistor network connected to the amplifier stage. The resistor network is arranged such that the output of the amplifier stage is configured to provide an output signal in which a differential mode noise in the first and second signals is suppressed in preference to a common mode noise in the first and second signals.

Abstract: This invention provides a memory structure and an operation method thereof. The memory structure includes a triode for alternating current (TRIAC) and a memory cell. The memory cell is electrically connected to the TRIAC.

Abstract: In certain embodiments, a system includes a master node device. The master node device includes communication circuitry configured to facilitate communication with a welding power supply unit via a long-range communication link, and to facilitate wireless communication with one or more welding-related devices via a short-range wireless communication network. The master node device also includes control circuitry configured to manage power consumption of on-board batteries of the master node device and the one or more welding-related devices.

Abstract: A system including a converter and a snubber circuit. The converter converts an alternating current voltage into a direct current voltage and outputs the direct current voltage across an inductance and a switch connected in series. The inductance has a center tap connected to a node, which is connected to a load. In response to the switch being turned on, a first current flows through the inductance and the switch. In response to the switch being turned off, a second current flows from the node to the load. The snubber circuit is connected across the node and a junction of the inductance and the switch. In response to the switch being turned off, the snubber circuit receives a third current from the junction, and supplies a first portion of the third current to the node. The second current and the first portion of the third current flow through the load.

Abstract: A driver circuit for use with LED lamps. The driver circuit uses a rectifier, a power factor correction subcircuit, a voltage conversion subcircuit, and a semiconductor switch. The power factor correction subcircuit uses a film capacitor instead of an electrolytic capacitor. As well, the power factor correction subcircuit uses either an inductor or a transformer to shape the incoming current to a substantially sinusoidal waveform that is in phase with the input AC current. The semiconductor switch provides a high frequency pulsating triangular current at the output of the rectifier.

Abstract: A converter to which an alternating current is inputted from an AC power supply rectifies the alternating current to output it to a DC link. An inverter is connected through the DC link to the converter and converts a direct current into an alternating current to output it to a load. A leakage current detector outputs a detection current corresponding to a leakage current leaking from the load. A compensating current output end is connected to a location where the leakage current leaks, and outputs a compensating current compensating for the leakage current in response to the detection current. A switch sets whether to input the detection current to the compensating current output section or not.

Abstract: A power conversion circuit comprises an AC source, a power conversion unit, a filter inductor unit and a common mode noise suppression circuit. The power conversion unit has DC terminals and AC terminals. The filter inductor unit has first and second terminals, being respectively connected to the AC source and the AC terminals of the power conversion unit. The common mode noise suppression circuit has a capacitive impedance network with first and second terminals, and an impedance balancing network with first and second terminals. The second terminals of the capacitive impedance network are connected to the first terminals of the impedance balancing network, the first terminals of the capacitive impedance network are connected to the first terminals of the filter inductor unit, and the second terminals of the impedance balancing network are connected to the DC terminals of the power conversion unit.

Abstract: A switching power supply determines the order n (a natural number) of the power supply higher harmonic component near the receiving frequency fc of an AM radio broadcast, and judges whether the higher harmonic component of the order n is higher or lower than the receiving frequency fc of the AM radio broadcast. According to the judgment result, the switching power supply determines an upper limit value and a lower limit value for the power supply frequency fs that does not interfere with the receiving frequency fc of the AM radio broadcast from the values of the fundamental power supply frequency fso of the switching operation, the order n of the higher harmonic component, the receiving frequency fc of the AM radio broadcast, and the bandwidth BW of the receiving frequency. The power supply frequency fs is set within the range specified by the upper and lower limit values.

Abstract: A system for distributing medium to high voltage AC electric power from a wind farm to electrolyzer modules requiring DC power. The system includes one or more of each of a central step down n-pulse transformer, a non-regulated n-pulse rectifier, a regulated n-pulse chopper type DC-DC converter, respective electrolyzer module controllers, a dispatch controller, an alternative load, and an alternative power source.

Abstract: The invention concerns a method and a system for online ferroresonance detection in a high voltage electrical distribution network. The method includes: Overflux detection (23), which acts as the start element, overflux being set if the flux is greater than a threshold for specified time duration, mode verification (26) which is to recognize the modes of the ferroresonance, a fuzzy logic method being used to discriminate the ferroresonance modes.

Abstract: A power converter includes a plurality of switches that interconnect first and second input terminals of the power converter with first and second output terminals of the power converter. The switches are switched to convert power from the input terminals to the output terminals. During the switching, voltage spikes are mitigated by a first RLC branch connected from the first input terminal to the first output terminal and by a second RLC branch connected from the second input terminal to the second output terminal.

Abstract: A direct current (DC)-DC converter, which includes an open loop ripple cancellation circuit, a switching supply, and a parallel amplifier, is disclosed. During a calibration mode, the parallel amplifier provides a parallel amplifier output current to regulate a power supply output voltage based on a calibration setpoint. The switching supply drives the parallel amplifier output current toward zero using a switching control signal, such that during the calibration mode, an estimate of a current gain is based on the switching control signal. Further, during the calibration mode, the open loop ripple cancellation circuit is disabled. During a normal operation mode, the open loop ripple cancellation circuit provides a ripple cancellation current, which is based on the estimate of the current gain.

Abstract: An apparatus and system comprise a noise cancelation power converter being configured for phase inverted synchronous operation with respect to a primary power converter. The primary power converter is operable to supply power to at least one device. The primary power converter produces a first electromagnetic interference during operation to supply the power. The first electromagnetic interference is coupleable to the device. The noise cancelation power converter further is configured with parasitic components substantially matching parasitic components of the primary power converter. The noise cancelation power converter further produces a second electromagnetic interference that is coupleable to the device.

Abstract: A pulse generator system and method, including an inductive storage device configured to perform a charging process using a high current received from a first power supply; and a switch that is powered by a second power supply and configured to receive a step signal through a gate driver for controlling a repetition rate of the inductive storage device charging process and a pulse repetition frequency (PRF) of an output pulse.

Abstract: A power converter includes a plurality of switches electrically coupled to each other for converting input power to output power. Each of the switches is sufficiently isolated to protect adjacent switches upon failure of one or more switches. The power converter also includes a controller for reconfiguring operation of the switches to provide at least a partial operating mode upon a switch failure.

Abstract: The invention provides a digital active EMI filter that removes, minimizes, or reduces unwanted interference (i.e., EMI noise) generated by a power circuit such as, for example, a power converter. Digital active filtering includes digital sampling of the incident noise signal amplitude and frequency, discrete time conversion of the EMI noise source, processing (e.g., inverting) the digital signal, and then constructing an analog output signal (i.e., an EMI compensation signal) which is injected to the input of the power circuit. A digital EMI filter as described herein may be used in both differential-mode and common-mode configurations, and overcomes limitations of passive and active analog EMI filters.

Abstract: An apparatus for estimating capacitance of a DC link capacitor in an inverter is provided. The apparatus for estimating capacitance of a DC link capacitor selects a unit power cell in which capacitance of a DC link capacitor is to be estimated, from unit power cells, and estimates capacitance of the DC link capacitor by correcting a reference voltage that controls a plurality of unit power cells.

Abstract: A method for controlling torsional oscillation includes detecting angular position of a wound field synchronous generator machine, extracting information indicative of torsional oscillation, selecting synchronous torsional oscillations, compensating for the synchronous torsional oscillations with an exciter signal, and controlling field current in the wound field synchronous generator using the exciter signal. A damping controller includes a damping module with a synchronous selective compensator and a synchronous notch filter for generating torsional oscillation compensation signals for asynchronous torsional oscillation.

Abstract: The invention relates to a hybrid integrated wind-solar-diesel-city power supply system, which comprises at least one subsystem selected from wind power subsystems or solar power subsystems and at least one diesel-city power subsystem, a direct-current bus unit, a main control unit, multiple high frequency rectifiers and a direct-current distribution unit. Each one subsystem has a DC output coupled to said direct-current bus unit for afflux.

Abstract: A submodule for forming a multilevel power converter for electric energy distribution and transmission, includes a capacitor unit and a power semiconductor circuit having power semiconductors that can be switched off. The capacitor unit and the power semiconductor circuit are interconnected in such a way that, depending on the actuation of the power semiconductors of the power semiconductor circuit, at least the voltage released at the capacitor unit or a zero voltage can be generated at output terminals of the submodule. The submodule is not only able to compensate for reactive power, but to exchange active power with a connected alternating current network. An additional energy storage device is connected to the capacitor unit through a chopper unit for regulating current flow between the additional energy storage device and the capacitor unit.

Abstract: A system includes a power source that provides alternating current (AC) power and is connected to system ground; a dual-DC bus that provides direct current (DC) power to a load, and comprises a positive line, a negative line, and a midpoint line; an active rectifier that converts AC power from the power source to DC power for the dual-DC bus; and an impedance circuit connected between the midpoint of the dual-DC bus and the system ground that provides impedance for third harmonic common-mode current.

Abstract: A filter for filtering a three-phase electrical power waveform produces a three-phase output power waveform. The filter has an inductor with three sets of first and second coils, each having a capacitor connected in series therewith. Each of the three sets of first and second coils has a tap intermediate the first and second coils where the output waveform is present, each tap capable of being connected to a load. In some embodiments, the inductor is passive adaptive and includes resistors for reducing current in-rush.

Abstract: An integrated circuit for digital controlling switching noise spurs in a receiver by shifting a switching frequency (fs) to a clock frequency (fs+?f) to move a Kth harmonic of the switching frequency (fs) is provided. The integrated circuit includes a spur controlled clock that operates the clock frequency (fs+?f), and a DC-DC converter circuitry that includes a first power switch, and a second power switch. The first power switch and the second power switch are driven by the clock frequency (fs+?f). ?f ranges from ( f RF - Kf s ) + BW K ? ? to ? ? ( f RF - ( K - 1 ) ? f s ) - BW K - 1 , and fRF is center frequency of a received channel. None of the harmonics of the clock frequency (fs+?f) is present in a channel of interest. The switching frequency is larger than the channel bandwidth 2BW.

Abstract: A power source circuit includes a switching circuit 4 that converts a direct current voltage obtained by converting an alternating voltage from an alternating power source input through a pair of power supply lines 2 and 3 into a predetermined direct current voltage by a switching operation. A fuse 5 is provided on one power supply line 2. A series circuit 9 including a first line bypass capacitor 7 and a resistor element 8 is connected between one power supply line 2 and a ground 6. A second line bypass capacitor 10 is connected between the other power supply line 3 and the ground 6. Imbalance of the circuit by an excess current protection element is prevented to reduce common mode noise.

Abstract: A noise suppression circuit for a power adapter is disclosed. The noise suppression circuit can reduce or eliminate adapter-induced noise that could interfere with an electronic device powered by the adapter. In one example, the noise suppression circuit can include an active circuit to detect and attenuate or cancel the induced noise. In another example, the noise suppression circuit can include an RLC circuit in parallel with the adapter choke to suppress the induced noise at the operating frequencies of the powered electronic device. In still another example, the noise suppression circuit can include a modified adapter Y capacitor connection so as to bypass the adapter choke, thereby reducing or eliminating the choke's induced noise.

Abstract: A power conversion device according to the aspects of the present technique is presented. The device includes a first converter and a second converter operatively coupled to the first converter. Moreover, the device includes a phase leg operatively coupled between the first converter, the second converter, where the phase leg includes a first unidirectional switch, a second unidirectional switch operatively coupled to the first unidirectional switch, and a first bidirectional switch, where a first end of the first bidirectional switch is operatively coupled to at least one of the first unidirectional switch and the second unidirectional switch.

Abstract: A noise reduction unit includes a plurality of cores each having formed therein a through hole, a plurality of wires connected to a noise source and each wound around the corresponding core through the through hole, and a core supporting member that supports the plurality of cores. The core supporting member supports the plurality of cores in such a manner that the plurality of cores is disposed parallel to each other along a through direction of the through holes and spaced apart from each other with a predetermined gap in the through direction.

Abstract: A control apparatus for a power quality device comprises: a power quality analysis module, for sampling a power supply network to obtain a power quality information, and performing an analysis and computing on the sampling, so as to output an instruction information; N tracking control modules, for receiving respectively the instruction information and tracking the instruction information, so as to output N PWM control signals having a same frequency and constant phase shift therebetween, where N is a positive integer and N?2, thereby to control the power quality device; wherein the power quality analysis module and the N tracking control modules are operated based on a synchronized signal.

Abstract: A filter apparatus includes at least one filter, each filter being tunable and including at least one capacitor arrangement. The capacitor arrangement includes a plurality of first capacitors, a plurality of second capacitors, and a plurality of switches. Each switch is switchable between a non-conducting mode and a conducting mode. The plurality of second capacitors and the plurality of switches are arranged to connect or disconnect the second capacitors on different potentials in order to tune the filter by adjusting the capacitance of the filter. An electrical power transmission or distribution system includes such a filter apparatus. A method is provided for filtering harmonics in an electrical power transmission or distribution system by means of such a filter apparatus.

Abstract: The disclosure relates to a passive power factor correction circuit. The passive power factor correction circuit comprises: a filtering device being used for decreasing high order harmonic of an input current; a resonance device being coupled to the filtering device for controlling operation time of the input current; and a suppression device being coupled to the resonance device for suppressing ripple of the input current.

Abstract: An apparatus for compensating a power system transmission line (46). The apparatus comprises an autotransformer (40) disposed in series with the transmission line (46). An autotransformer series winding (40A) extends from an input terminal (46) to a neutral terminal (44) and a common winding (40B) extends from an output terminal (54) to the neutral terminal (44). A compensating device (42) is connected between the neutral terminal (44) and ground. Although connected in shunt with the transmission line (46), the compensating device (42) operates as a series-connected compensating device relative to the transmission line (46). The autotransformer (40) can be connected in a buck or a boost configuration with a fixed or moveable winding tap (88). Also, two autotransformers (110, 114) can be connected in a back-to-back configuration with the compensating device (42) connected to either autotransformer (110, 114).

Abstract: A ripple compensation apparatus comprises a ripple detection unit to detect a ripple on a dual DC bus, a waveform generation unit to generate a modulated waveform based on a base waveform and the detected ripple, and a multi-phase control signal generation unit to receive the modulated waveform and to generate at least one pulse width modulated control signal based on the modulated waveform.

Abstract: A current control unit takes a deviation between a current command value and a current flowing through an inverter of a power conversion device, and controls the inverter based on the deviation. A harmonic sensing part receives input of an output current of an AC filter, and outputs a predetermined order harmonic of the input current in a direct current value form. A disturbance observer estimates the disturbance of the harmonic based on the output current and a coefficient defined as an inverse function of a transfer function from harmonic suppression current command value to filter output current detection value. A harmonic suppression control unit takes the deviation between the estimated harmonic disturbance and a disturbance command value that suppresses the disturbance, and calculates a harmonic suppression current command value. The harmonic suppression current command value is superimposed on the current command value of the current control unit.

Abstract: There is provided a filter for receiving a rectangular or stepped source voltage to be filtered and for providing an output voltage, the filter including means arranged to determine the output voltage in dependence on the frequency components of the source voltage within the filter passband, and independent of output current drawn.

Abstract: The present invention provides for EMI mitigation in switching circuitry, such as power converters, by implementing a controlled, non-random change in frequency in every cycle of switch control signals based on a static or dynamically changing modulation cycle. This permits frequency spreading across a wide range while avoiding excessive jitter between cycles and voltage dropouts common to randomized EMI control circuitry. Further, since it may be implemented digitally, some embodiments may avoid performance, size and power consumption problems experienced by mixed signal or analog switch control circuitry and EMI control circuitry. Further still, implementations of the present invention may mitigate EMI from a constant frequency source without the necessity of a variable frequency source, such as one generated by a VCO, to realize frequency variation.

Abstract: A switched-mode power supply (SMPS) and a method of control thereof is described, wherein the SMPS is operable to apply a spread spectrum modulation to a switching driver signal to reduce EMI in the SMPS. The SMPS is operable to perform voltage and current monitoring in parallel to the spread spectrum modulation to provide variable limit threshold detection and shutdown capabilities for circuit protection.

Abstract: A power converter including a rectifier stage connected to plural phases of a network delivering an input current at a determined fundamental frequency, a DC power supply bus and a bus capacitor connected to the DC power supply bus. The converter includes a controlled current source situated on the DC power supply bus, the current source making it possible to control a rectifier current, flowing on the DC power supply bus, and a controller for the controlled current source to control a rectifier current, flowing on the DC power supply bus. The controller is configured to implement a regulation loop into which are injected a first harmonic and a second harmonic synchronized respectively at six times and twelve times the fundamental frequency of the input current delivered by the network, the amplitude and phase of these harmonics being determined to limit the THDi and the PWHD.

Abstract: A monitoring method with a function of correlation-based system identification applicable for a digitally controlled DC-DC converter system is revealed. The monitoring method includes a plurality of steps. After the system is operated in a steady state, input a pseudo random binary sequence signal into the system via a pseudo random binary sequence generator and store the pseudo random binary sequence signal and an output signal of a path to be monitored in a memory unit. Then perform a correlation analysis of data stored in the memory unit by a correlation analysis module and output an impulse response. Next obtain a frequency response of the impulse response by a discrete-time Fourier transform module. Finally, smooth the frequency response by an adaptive sliding window smoothing module so that a monitoring curve of the frequency response becomes smooth.

Abstract: The invention comprises a high frequency inductor filter apparatus coupled with an inverter yielding high frequency harmonics and/or non-sixty Hertz output. For example, an inductor/converter apparatus is provided using a silicon carbide transistor that outputs power having a carrier frequency, modulated by a fundamental frequency, and a set of harmonic frequencies. A filter, comprising an inductor having a distributed gap core material and optional magnet wires, receives power output from the inverter/converter and processes the power by passing the fundamental frequency while reducing amplitude of the harmonic frequencies.

Abstract: In a power source circuit including a switching circuit 8 as a power conversion circuit for converting by a switching operation at least one of a frequency and a voltage of an alternating voltage from an alternating power source 2 via a pair of supply lines 3 and 4, one supply line 3 includes a fuse 5 as an excess current protection element, and between a ground line 10 and one supply line 3, a first line bypass capacitor 6 is connected. Between the ground line 10 and another supply line 4, a second line bypass capacitor 7 is connected, and another supply line 4 includes an inductor 9. With this configuration, an unbalanced state of the circuit due to the excess current protection element is reduced so as to restrain the common mode noise.