Abstract: A power factor correction circuit comprising: a global voltage input; and means for deriving a reference current from the global voltage; whereby the means for deriving the reference current comprises a leading phase admittance cancellation, LPAC, transfer function and a filter, whereby the reference current is derived from a sum of an output of the LPAC transfer function and an output of the filter.

Abstract: A proportional integrator for control of a motor drive arranged to be connected in parallel with one or more other motor drives to drive a common load. The proportional integrator includes means to receive an input command signal and to compare with a local measured signal from the motor drive and to output a local control signal for that motor drive, further comprising a global input signal indicative of the behaviour of the one or more other motor drives, the global input signal being incorporated into the proportional integral function with the input command signal and the local measured signal to provide the local control signal.

Abstract: A proportional integrator for control of a motor drive arranged to be connected in parallel with one or more other motor drives to drive a common load. The proportional integrator includes means to receive an input command signal and to compare with a local measured signal from the motor drive and to output a local control signal for that motor drive. Also includes are a global input signal indicative of the behaviour of the one or more other motor drives, the global input signal being incorporated into the proportional integral function with the input command signal and the local measured signal to provide the local control signal.

Abstract: A magnetic core section of a transformer or an inductor, includes a substantially rectangular core section body having opposing sides joined by opposing ends, and further comprising interlocking features provided at each of the ends, shaped to interlock with interlocking features of complementary core sections.

Abstract: A power factor correction circuit comprising: a global voltage input; and means for deriving a reference current from the global voltage; whereby the means for deriving the reference current comprises a digital leading phase admittance cancellation, DLPAC, transfer function and a filter, whereby the reference current is derived from a sum of an output of the DLPAC transfer function and an output of the filter, and further comprising means for compensating for delays in the DLPAC function.

Abstract: An electrical power converter (1, 1?, 1?) includes a DC link capacitor (3, 3?, 3?) configured for connection to a DC power source to provide an input load, at least one pair of semiconductor switches (2a, 2b, 2c, 2a?, 2b?, 2a?, 2b?) connected in parallel with the DC link capacitor (3, 3?, 3?) and positioned on either side of an output load terminal (10a, 10b, 10c, 10a?, 10b?, 10a?, 10b?). The electrical power converter (1, 1?, 1?) further includes an inductive current sensor (12, 12?, 12?), arranged to sense a primary current from a terminal of the DC link capacitor (3, 3?, 3?), and a detection circuit (14), connected to the inductive current sensor (12, 12?, 12?) and arranged to monitor for an over-current condition, and to produce an output which causes at least one of the pair of semiconductor switches (2a, 2b, 2c, 2a?, 2b?, 2a?, 2b?) to be switched to a non-conducting state when an over-current condition is detected.

Abstract: An auto-transformer rectifier system comprising an 18-pulse (or multiple of 18-pulse) autotransformer rectifier unit ATRU having three, or a multiple of three, diode bridge rectifiers and a balancing resistor to balance the power flow through the diode bridge rectifiers, wherein the balancing resistor has a variable resistance, and further comprising a controller configured to identify imbalances between power flows of the respective diode bridge rectifiers and to adjust the resistance of the balancing resistor in response to the detected imbalance.

Abstract: A system for detecting a fault in electric power conversion equipment having an input stage and an output stage includes an output voltage sensor positioned within the output stage and configured to generate an output voltage signal; an input current sensor positioned at the input stage and configured to generate an input current signal; and a processor configured to analyze the output voltage signal and the input current signal to determine an occurrence of the fault in the electric power conversion equipment.

Abstract: A system for providing power to one or more loads includes a plurality of power converters where each power converter is configured to be arranged in a parallel configuration with one or more additional power converters so as to provide power to the one or more loads. The system also includes a central controller configured to receive a plurality of local voltage reference values from each of the power converters, output a global voltage reference value based on the local voltage reference values, and transmit the global voltage reference value to each of the power converters.

Abstract: A switching bridge for the DC-DC stage of a power converter, the switching bridge having one or more sets of upper and lower series-connected switches (S1, S2) connected across a DC bus and arranged to be switched to provide an output AC voltage, the switching bridge further comprising a voltage divider (C1) arranged to vary the output AC voltage level according to the switching state of the switches.

Abstract: A bootstrap gate driver charging circuit arranged to drive the gate of an upper switch (QU) and a lower switch (QL) connected in series to provide an AC output voltage (400) voltage by alternatively turning on and off according to a predetermined duty cycle of alternate upper switch turn-on and lower switch turn-on phases, the bootstrap gate driver charging circuit comprising: an input terminal; an output terminal; an H-bridge inverter with an inverter input and an inverter output; a charging path; and a bootstrap capacitor. The input inverter is electrically connected to the input terminal, the inverter output is electrically connected to a first end of the bootstrap capacitor, the charging path is electrically connected between a second end of the bootstrap capacitor and a gate driver supply voltage; wherein in response to the lower switch being turned ON and providing a path to ground with respect to the supply voltage.

Abstract: A zero-sequence blocking transformer includes a first core part, a first pair of windings wound around the first core part, a second core part and a second pair of windings wound around the second core part, the first core and the second core having a geometry to generate a leakage inductance.

Abstract: A system for detecting a fault in electric power conversion equipment having an input stage and an output stage includes an output voltage sensor positioned within the output stage and configured to generate an output voltage signal; an input current sensor positioned at the input stage and configured to generate an input current signal; and a processor configured to analyze the output voltage signal and the input current signal to determine an occurrence of the fault in the electric power conversion equipment.

Abstract: A system for controlling one or more loads. The system comprises a plurality of power converters, wherein each power converter is configured to be arranged in a parallel configuration with one or more additional power converters so as to control the one or more loads, and a central controller configured to output a common reference based on local current or voltage values received from each power converter; and transmit the common reference to each of the power converters. Each power converter comprises an inverter configured to control the one or more loads based on voltage switching signals, a module configured to provide the voltage switching signals to the inverter according to a modulation scheme.

Abstract: A power factor correction circuit comprising: a global voltage input; and means for deriving a reference current from the global voltage; whereby the means for deriving the reference current comprises a digital leading phase admittance cancellation, DLPAC, transfer function and a filter, whereby the reference current is derived from a sum of an output of the DLPAC transfer function and an output of the filter, and further comprising means for compensating for delays in the DLPAC function.

Abstract: A power factor correction circuit comprising: a global voltage input; and means for deriving a reference current from the global voltage; whereby the means for deriving the reference current comprises a leading phase admittance cancellation, LPAC, transfer function and a filter, whereby the reference current is derived from a sum of an output of the LPAC transfer function and an output of the filter.

Abstract: A power converter for providing power to one or more loads, wherein the power converter is configured to be arranged in a parallel configuration with one or more additional power converters. The power converter comprises an inverter for receiving an input voltage and converting this to an output voltage having an associated output current, a module configured to modulate the output voltage using a modulation scheme and first and second feedback circuits.

Abstract: A proportional integrator for control of a motor drive arranged to be connected in parallel with one or more other motor drives to drive a common load. The proportional integrator includes means to receive an input command signal and to compare with a local measured signal from the motor drive and to output a local control signal for that motor drive. Also includes are a global input signal indicative of the behaviour of the one or more other motor drives, the global input signal being incorporated into the proportional integral function with the input command signal and the local measured signal to provide the local control signal.

Abstract: A power converter comprising a single-ended primary-inductor converter (“SEPIC”) includes a first inductive element (L1) and a second inductive element (L2) that are arranged, in the usual way, to provide a first, non-isolated load. The power converter further includes an isolated load circuit comprising a third inductive element (L3) connected to a second output for delivery a second, isolated load. The third inductive element (L3) is coupled to the first inductive element (L1) and/or the second inductive element (L2) to transfer power to the isolated load circuit to deliver the second load, and wherein the first inductive element (L1), the second inductive element (L2) and the third inductive element (L3) are each wound around a single magnetic core.

Abstract: There is provided a system for providing (e.g., configured to provide) power to one or more loads. The system comprises a plurality of power converters, wherein each power converter is configured to be arranged in a parallel configuration with one or more additional power converters so as to provide power to the one or more loads. The system further comprises a central controller configured to receive a plurality of local current measurement values from each of the power converters, output a global current measurement value based on the local current measurement values, and transmit the global current measurement value to each of the power converters, wherein each power converter comprises an inverter for receiving an input voltage and converting this to an output voltage having one or more associated output current(s).