Abstract: A method of operating a multilevel converter having multiple phase modules, each with three phase module branches. In a first switching position, a switching device of each phase module connects an alternating voltage connection of the phase module to a first connection point between a first phase module branch and a third phase module branch. In a second switching position, the switching device connects the alternating voltage connection to a second connection point between the third phase module branch and a second phase module branch. In the method, circulating currents of the multilevel converter are controlled in accordance with total energy variables and differential energy variables of the phase modules to balance the energy between the phase module branches.

Abstract: A voltage clamp circuit comprises an input portion arranged to receive an input voltage at an input terminal. The input portion comprises a clamp diode having an anode connected to the input terminal. A first terminal of a switching element is connected to a cathode of the clamp diode and a control terminal of the switching element is connected to a reference node (Vref). A resonant tank portion comprises an inductor and a capacitor connected in series at a resonance node (Vres). The resonance node is connected to a second terminal of the switching element. The capacitor is connected between the resonance node and the first terminal of the switching element. The inductor is connected between the resonance node and an output terminal of the voltage clamp. When a voltage at the first terminal of the switching element is greater than a threshold value the switching element is turned on.

Abstract: The purpose of the present disclosure is to protect a power circuit of a base station in a wireless communication system, the base station comprising: at least one module for processing a signal; and the power circuit for supplying power to the at least one module. The power circuit comprises a transformer, a rectifier circuit and a smoothing circuit, and the power circuit reduces the ratio of an on-section of the rectifier circuit if a reverse current from the at least one module is detected.

Abstract: A power supply device according to the present disclosure includes a first resistor and a second resistor connected in series between an output terminal and a reference potential; a power converter connected to the output terminal and a reference point between the first resistor and the second resistor, configured to supply a first voltage to the output terminal, and configured to control the first voltage to cause a second voltage generated at the reference point, to have a predetermined value; a protective current output circuit configured to output a protective current depending on an output current supplied to the output terminal and a limit current; and a control circuit to which the protective current is input, the control circuit being configured to draw in, from the reference point, a drawn-in current obtained by subtracting the protective current from a set current depending on a set value.

Abstract: A multiphase interleaved forward power converter includes an inductor and first and second subconverter comprising respective transformers. The converter also includes first and second drives configured to respectively operate the first and second subconverters with cycling periods comprising a conduction period, a reset period, and an idle period. The first and second drives are also configured to phase shift the cycling periods in each subconverter such that the conduction period of the subconverter is at least partially complementary to the idle period of the other subconverter. The second drive also clamps a voltage across a winding of the transformer of the first subconverter to substantially prevent a first resonance voltage from propagating in the first subconverter during the idle period of the first subconverter.

Abstract: A converter assembly has multi-phase multi-stage converters which are connected to parallel-connected transformers. The converter assembly contains series-connected partial converters, each having three parallel-connected bipolar phase modules, which are formed of two series-connected converter modules. The connection points of the converter modules form the phase connections for the transformers. The phase modules of a first partial converter consist only of unipolar sub-modules and those of a second partial converter consists only of bipolar sub-modules. A controller respectively reduces at least the partial DC voltage of the second partial converter, wherein the partial DC voltage thereof can be inverted at least until compensating the partial DC voltage of the first partial converter if the direct current exceeds a target value.

Abstract: A power supply control device according to one or more embodiments may be provided to: control a power conversion device that has a configuration in which a resonant circuit is provided on an output side of a matrix converter including switching circuits having snubber elements, and that performs AC-AC conversion of output from a multi-phase AC power supply. The power supply control device performs control such that: the output current, which has a phase difference caused by the resonant circuit, is negative during a period in which an absolute value of a positive-going output voltage that is output from the power conversion device increases while the output current is positive during a period in which the absolute value of a negative-going output voltage increases; and a polarity of the output current does not change within a period in which the snubber element is discharged.

Abstract: A fault detection method is sampling currents flowing through a plurality of switching circuits to generate a plurality of current sampling signals, generating a first reference signal and a second reference signal based on a predetermined reference signal and a ripple threshold signal, and generating a plurality of fault signals based on comparison results of each of the plurality of current sampling signals with the first reference signal and the second reference signal. When one of the plurality of current sampling signals is between the first reference signal and the second reference signal, a corresponding one of the plurality of fault signals changes to a first state, and when the corresponding one of the plurality of fault signals remains the first state for more than a predetermined time period, a corresponding one of control signals turns off a corresponding one of the plurality of switching circuits.

Abstract: A simulation current signal generation circuit applied to a power conversion circuit is disclosed. The power conversion circuit has an output terminal and includes an output stage, a PWM circuit and an impedance component. One terminal of impedance component is coupled to the output terminal. The generation circuit includes a first current signal circuit, a second current signal circuit and a switching circuit. The first current signal circuit, coupled to another terminal of impedance component, provides a first current signal. The second current signal circuit, coupled to the output stage, senses a current of a power switch in the output stage to provide a second current signal. The switching circuit, coupled to the first current signal circuit, second current signal circuit and PWM circuit respectively, selectively outputs the first current signal or second current signal according to a PWM signal provided by the PWM circuit.

Abstract: In one embodiment, a control circuit configured for an interleaved switching power supply, can include: (i) a feedback compensation signal generation circuit configured to sample an output voltage of the interleaved switching power supply, and to generate a feedback compensation signal; (ii) a first switch control circuit configured to compare a voltage signal indicative of an inductor current in the first voltage regulation circuit against the feedback compensation signal, and to control a first main power switch in the first voltage regulation circuit; and (iii) a second switch control circuit configured to turn on a second main power switch in the second voltage regulation circuit after half of a switching cycle after the first main power switch is turned on, and to regulate an on time of the second main power switch.

Abstract: According to one aspect, embodiments of the invention provide a UPS comprising a line input, an interface configured to be coupled to a DC power source, an output, a PFC converter, a positive DC bus coupled to the PFC converter and configured to provide a positive DC output, a negative DC bus coupled to the PFC converter and configured to provide a negative DC output, a DC-DC converter coupled to the interface, and a controller configured to operate, in an online mode of operation, the PFC converter to provide regulated DC power, derived from input AC power, to the positive DC bus and the negative DC bus, and operate, in a backup mode of operation, the DC-DC converter to convert backup DC power to unregulated power, and the PFC converter to provide regulated DC power, derived from the unregulated power, to the positive DC bus and the negative DC bus.

Abstract: A power supply according to the present disclosure includes: a step-down circuit which has at least one pair of positive/negative step-down switching elements; at least one pair of positive/negative inductors to which voltage is applied via the step-down switching element, and one pair of positive/negative output capacitors which are connected in series and charged by electrical current passing through the inductor, and steps down input voltage and then outputs; an inverse-conversion circuit which has a plurality of inverse-conversion switching elements, and inverse-converts output voltage of the step-down circuit into alternating current; and a control circuit which controls switching of the plurality of step-down switching elements so that the output voltage of the step-down circuit becomes a desired voltage.

Abstract: The invention discloses a system and a method for dynamic over-current protection for power converters. The system can be connected to the output of a power stage and comprises: a comparator that measures an output current (IOUT) of the power stage; a control device that measures a voltage (VDC) of the power stage; a test generator that comprises pairs of voltage-current values (VDC-IREF) that relate voltage values with current values of the power stage, where the test generator receives the measured voltage value from the control device and sends the corresponding current value from the pairs of voltage-current values to the comparator, which halts the power stage if the output current of the power stage is higher than or equal to the value of the current associated with the measured voltage.

Abstract: A control circuit of the present invention includes a drive circuit for outputting a gate drive signal, a charging circuit for generating a charging current when the drive circuit is started up, and a Vcc control circuit for, upon receiving an output from the charging circuit, outputting a control signal for supplying Vcc for the drive circuit, wherein the drive circuit, the charging circuit, and the Vcc control circuit are provided in one chip.

Abstract: The invention relates to the controlling of a multi-phase rectifier for adapting the temperature distribution in the rectifier. According to the invention, the phase currents in the individual phases are adjusted on the output-side of the rectifier with a different amplitude. Correspondingly, the respective half bridges in the rectifier are loaded to a differing degree. In this way, an uneven temperature distribution can be compensated in the rectifier. Alternatively, an uneven temperature distribution can also be adjusted in the rectifier in a targeted manner, in order to take further parameters into account.

Abstract: The present invention provides for an electronic isolator, or barrier, device arranged for receiving field wiring from a field element and further including connection means arranged to receive a surge element for providing surge functionality to the device, and to provide surge protection to the connectivity by way of the field wiring, the device arranged such that the surge element connects to the device and to the said field wiring by way of the said connection means so that operational connection/disconnection of the surge element to the device does not require disconnection of the field wiring from the device.

Abstract: A control device of a multi-phase converter having N converter circuits connected in parallel includes: a determination unit configured to determine each share ratio of the N converter circuits to unevenly share input current to the multi-phase converter among the N converter circuits such that a conversion efficiency indicating a ratio of output power from the multi-phase converter with respect to input power to the multi-phase converter is higher in the case where the input current is unevenly shared by the N converter circuits compared to the case where the input current is evenly shared by the N converter circuits when the number of driven converter circuits is one or more and N?1 or less and the start condition is satisfied; and a diagnosis unit configured to diagnose an abnormality of the N converter circuits when the N converter circuits are driven in accordance with the determined share ratios.

Abstract: A redundant energy acquisition circuit of a power module includes at least one power semiconductor device, a first capacitor, and a first bypass switch. The redundant energy acquisition circuit of the power module includes: a power supply board acquiring energy from the first capacitor, supplying power to a control board, and charging a discharge circuit. A first charging circuit has one end connected to a positive electrode of the first capacitor and another end connected to the discharge circuit, and charges the discharge circuit when the power supply board is not operating normally. The control board controls the discharge circuit to close. The discharge circuit discharges and triggers the first bypass switch to close after the discharge circuit is closed.

Abstract: Systems and methods are provided for improved stability of driver amplifiers. In one example, a system includes an NMOSFET power device operable to generate a current signal at a drain terminal. The system further includes a current comparison amplifier operable to amplify a difference signal comprising a difference between a replica current signal of the NMOSFET power device and a reference current signal to drive a current comparison amplifier voltage output signal. The system further includes a PMOSFET clamp device comprising a source terminal coupled to a gate terminal of the NMOSFET power device operable to limit a voltage at the gate terminal of the NMOSFET power device responsive to the current comparison amplifier voltage output signal.

Abstract: A method may include: applying a first voltage on at least one first terminal of a first direct current (DC) bus electrically connected to a power source, obtaining at least one indication that discharge of a second voltage related to the first voltage should be performed, and discharging the second voltage by electrically connecting at least one second terminal of a second DC bus to a ground in response to the at least one indication. Another method may include: injecting a current at at least one terminal of a direct current (DC) bus that is electrically connected to a power source, simultaneous to injecting the current, measuring an insulation relative to ground, obtaining an electrical parameter related to the power source, and, in response to the electrical parameter, maintaining the current injected at the terminal of the DC bus without ceasing the measuring of the insulation relative to a ground.