Abstract: A method for reducing EMI for a frequency-modulated DC-DC converter includes pre-regulating an input voltage of the frequency-modulated DC-DC converter, so that the frequency-modulated DC-DC converter changes an operating frequency of the frequency-modulated DC-DC converter to stabilize an output voltage of the frequency-modulated DC-DC converter, so as to achieve a desired frequency extension.

Abstract: A current fed high-frequency isolated matrix converter and the corresponding modulation and control schemes are provided. The converter includes a current source full-bridge converter, a high-frequency transformer, a matrix converter, and a three-phase filter. An optimized space vector modulation solution is used for controlling the converter, and by comparing magnitudes of three-phase filter capacitor voltages to determine an action sequence of space vectors, switch tubes are turned on at zero voltage. A current source full-bridge circuit adopts a commutation strategy of a secondary clamping, and by calculating a leakage inductive current commutation time, full-bridge switch tubes are turned off at zero current to achieve safe and reliable commutation, and having advantages of a low system loss, a high efficiency, and a high power density.

Abstract: A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

Abstract: A voltage converter powers a load. The voltage converter includes a first power converter and a second power converter. The first power converter produces an intermediate voltage and a first output current derived from an input voltage. The first power converter supplies the intermediate voltage to the second power converter. The second power converter produces a second output current based on the intermediate voltage received from the first power converter. An output node of the voltage converter outputs a sum of the first output current and the second output current to produce an output voltage.

Abstract: The disclosure provides a single-stage isolated bidirectional converter and a control method thereof. The converter includes: a first full-bridge circuit unit, a half-bridge circuit unit, a second full-bridge circuit unit, a phase-shift inductor unit, a transformer and a filter capacitor. The transformer includes a first winding and a second winding, and the first winding is provided with a center tap. The center tap is connected to the first port, two ends thereof are connected to the midpoints of the two bridge arms of the first full-bridge circuit unit through the phase-shift inductor unit, and two ends of the second winding are connected to the midpoints of the two bridge arms of the second full-bridge circuit unit. Two ends of the first full-bridge circuit unit are connected to two ends of the half-bridge circuit unit; two ends of the half-bridge circuit unit are connected to two ends of the filter capacitor.

Abstract: A control circuit for an NPC-type three-level converter is provided. Each phase bridge arm of the NPC-type three-level converter includes multiple IGBT devices. For each phase bridge arm, a control circuit corresponding to the phase bridge arm includes an off-time control circuit and a timing control circuit. The off-time control circuit is configured to reserve a preset time period for turn-off of the multiple IGBT devices in the corresponding phase bridge arm. The timing control circuit includes a first sub-circuit and a second sub-circuit, and each sub-circuit of the first sub-circuit and the second sub-circuit includes: a first fixed delay circuit, a second fixed delay circuit, a first AND gate circuit and a first OR gate circuit. For each sub-circuit, output terminals of the first AND gate circuit and the first OR gate circuit serve as output terminals of the timing control circuit, respectively.

Abstract: A method for controlling an electronic switching unit for supplying electric power to an inductive power load, includes the following steps: activating an initial filter capacitor by connecting it between the electric power supply of the electronic unit and ground, and deactivating the other capacitors of the bank of filter capacitors; measuring the current flowing through this initial filter capacitor; if this current is above a predetermined nominal current threshold, activating an additional filter capacitor by connecting it between the electric power supply of the electronic unit and ground, in parallel with the initial filter capacitor.

Abstract: A switched mode power supply (SMPS) includes a filter (202), a power factor correction (PFC) circuit (204), and a control circuit (206, 406) configured to determine various electrical parameters of the SMPS. In some embodiments, the control circuit (206, 406) is configured to determine a power line frequency and an AC input voltage based on an AC line voltage and an AC neural voltage. In other embodiments, the control circuit (206, 406) is configured to determine an AC input current based on a reactive current flowing through the filter (202) and a PFC AC current. In further embodiments, the control circuit (206, 406) is configured to report a value of an electrical parameter if value is determined to be accurate. Other example switch mode power supplies, control circuits and methods are also disclosed.

Abstract: A control circuit for a power factor correction (PFC) circuit, the control circuit includes a multiplier having first, second, and third multiplier inputs and a multiplier output. The control circuit has an adder having first and second inputs and an output. The first input of the adder is coupled to the multiplier output. The control circuit further includes a root mean square (RMS) calculation circuit configured to determine a square of a root mean square of an input sinusoidal voltage. The RMS calculation circuit has an output coupled to the second multiplier input. An input voltage square calculation circuit is configured to determine a square of the input sinusoidal voltage. The input voltage square calculation circuit has an output coupled to the third multiplier input.

Abstract: A bridge circuit includes a first leg and a second leg arranged in parallel between the first node and the third node. A clamp circuit includes a third leg including a first bidirectional switch disposed between a fourth node that is a midpoint of the first leg and a fifth node that is a midpoint of the second leg. A first reactor is connected with the fourth node and a sixth node, and a second reactor is connected with a fifth node and a seventh node. A fourth leg includes a second bidirectional switch disposed between the second node and the fourth node or the fifth node.

Abstract: Obtain an electric power converter by which a downsizing and a low cost can be realized in such a way that main components are standardized. A transformer and rectifier elements of a rectifier circuit are configured by using a single module, and a center tap is configured by laminating one pullout portion of a first secondary winding and one pullout portion of a second secondary winding, and a central connecting component is connected to a center tap and a terminal of a smoothing coil which composes a smoothing reactor.

Abstract: A two-stage power converter can incorporate a buck pre-regulator and a resonant bus converter. Such a converter may be operated to achieve unconditional soft switching operation (zero voltage switching a/k/a ZVS) over a wide input and output range, while delivering excellent power conversion efficiency at lower power levels and in a no load condition.

Abstract: An AC/DC Switching Mode Power Supply (SMPS) comprises a PFC stage, an isolated LLC DC/DC converter stage, and a control circuit that provides feedback/control signals to PFC and LLC controllers, to enable a plurality of operating modes, dependent on a sensed peak AC input voltage and required output voltage Vo. The PFC provides a first DC bus voltage Vdc (e.g. 200V) for low line AC input and a second DC bus voltage (e.g. 400V) for high line or universal AC input. A multi-mode LLC converter is operable in a half-bridge mode or a full-bridge mode. For low line AC input, output voltage Vo, and PFC output Vdc, the LLC operates in full-bridge mode; for high line input, output voltage Vo and PFC output 2×Vdc, the LLC operates in half-bridge mode; for universal AC input, output voltage 2×Vo, and PFC output 2×Vdc, the LLC operates in full-bridge mode.

Abstract: A power conversion system comprising, three full wave LLC resonant converters each of which has an associated high frequency isolation transformer, a full wave rectifier and an unfolding inverter, to provide a direct connection to a Medium Voltage (MV) three-phase grid for a high power photovoltaic system.

Abstract: In a method for operating a controllable converter with an intermediate circuit capacitor, the control behavior can be improved by transmitting, depending on an intermediate circuit voltage applied to the intermediate circuit capacitor, an additional power component via the controllable converter such that the electric current that is generated by the controllable converter for the additional power component counteracts an oscillation of the intermediate circuit voltage. The additional power component is transmitted by the controllable converter to a connected motor as a pulsating additional torque. Also described is a controllable converter with a control unit for carrying out a method, wherein the controllable converter has semiconductors that can be switched off, and an intermediate circuit capacitor designed as a film-type capacitor.

Abstract: Voltage converter circuits including a first and second branch. The first branch is coupled between a first DC terminal and a second DC terminal and includes a first and second winding around a magnetic core. The first and second winding are coupled to an AC terminal via a common node. The second branch is coupled in parallel to the first branch between the first and second DC terminals and includes a third winding around the magnetic core. The third winding is coupled to the AC terminal such that the first and second branches convert a first voltage into a second voltage. The first, second and third windings are configured to cause magnetic flux generated by a differential mode (DM) component of a first current in the first branch and magnetic flux generated by the DM component of a second current in the second branch to enhance with each other.

Abstract: A DC-DC auto-converter module includes a positive source terminal, a negative source terminal, a positive load terminal, a negative load terminal, and a DC-DC converter. The negative source terminal cooperates with the positive source terminal to facilitate electrical connection of a DC power source thereto. The negative load terminal cooperates with the positive load terminal to facilitate connection of an electrical load thereto. The isolated DC-DC converter comprises an input circuit and an output circuit that is galvanically isolated from the input circuit. The DC-DC converter includes a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal. At least one of the positive input terminal, the negative input terminal, the positive output terminal, and the negative output terminal is galvanically connected to at least one of the positive source terminal, the negative source terminal, the positive load terminal, and the negative load terminal.

Abstract: The present disclosure provides a series resonant converter and its corresponding control method. In one aspect, the series resonant converter includes m (m=1, 2, 3, . . . ) sets of primary side stages in parallel, wherein each primary side stage is identical and includes n (n=2, 3, . . . ) stacked element circuits, where the primary side stages receive an input voltage; n×m resonant networks coupled to the primary side stages; n×m transformers having n×m primary side windings and n×m secondary side windings, where the primary side windings are coupled to the n×m resonant networks; p (p=1, 2, 3, . . . ) sets of secondary side stages in parallel, wherein each secondary side stage is identical and includes q (q=n×m/p) stacked element circuits, where the secondary side stages are coupled to n×m secondary side windings; and a control block controlling the primary side switches according to the output voltage, input voltage and input capacitor voltages.

Abstract: A switch-mode power supply includes a pair of input terminals for receiving an alternating current (AC) or direct current (DC) voltage input from an input power source, a pair of output terminals for supplying a direct current (DC) voltage output to a load, and a three-level LLC circuit coupled between the pair of input terminals and the pair of output terminals. The circuit includes a first switch coupled with a first diode to define a first half-bridge and a second switch coupled with a second diode to define a second half-bridge. The power supply further includes a third switch coupled across the first diode and the second diode to short circuit the first diode and the second diode when the third switch is closed, and a control circuit including a voltage-controlled oscillator (VCO), at least one flip-flop and multiple logic gates to operate the three switches with zero-voltage switching (ZVS).

Abstract: One or more chip-embedded integrated voltage regulators (“CEIVR's”) are configured to provide power to a circuit or chip such as a CPU or GPU and meet power delivery specifications. The CEIVR's, circuit or chip, and power delivery pathways can be included within the same package. The CEIVR's can be separate from the circuit or chip.