Abstract: A converter arrangement with at least two single LLC converters, a pulse generator per single LLC converter wherein each pulse generator is configured to supply switching pulses to one single LLC converter and an output controller configured to use switching frequency control and/or phase-shift control to control the pulse generators comprises a load balancing control for overcoming unbalanced loading of the converter arrangement.

Abstract: A forward converter comprises a magnetic component with a transformer and a filter output inductor. Also disclosed is a method for assembly of a forward converter. A first and a second U/UR core are arranged to form an O-core. Windings of the transformer are arranged on the O-core. A bobbin-less U/UR core is arranged to abut the O-core, and windings of a filter output inductor are arranged directly on a body section of the bobbin-less U/UR core. Alternatively, windings of the transformer are arranged on a first section of an E/ER core, and windings of the filter output inductor are arranged directly on a second, bobbin-less section of the E/ER core.

Abstract: The invention relates to a power conversion system, wherein a first switch is connected between a input voltage source and a second switch, wherein the second switch is connected to a third switch, wherein the third switch is connected to a fourth switch, wherein the fourth switch is connected to the input voltage source, wherein a first diode is connected between a neutral point and the second switch, wherein a second diode is connected between the third switch and the neutral point. Two or more current transformers are arranged such that a drive signal is produced in an interleaved mode.

Abstract: In an AC-AC converter comprising a primary side, a secondary side and a regulator, wherein the regulator comprises a voltage regulation circuit configured to determine an error voltage based on an at least partially alternating feedback voltage fed into the regulator from the secondary side of the AC-AC converter and to supply this error voltage and/or an information about this error voltage to the primary side of the AC-AC converter, the regulator comprises an averaging circuit configured to determine an average DC voltage based on the feedback voltage.

Abstract: The invention relates to a surge protected power supply for feeding a device with electrical energy. The power supply includes a surge protection device SPD connected in series with a controllable switch where this series connection is connected between two current conductors of the power supply. The power supply further includes a device for determining a comparison voltage such that the comparison voltage is in some form indicative of a surge voltage present at the input of the power supply. This comparison voltage then is compared to a threshold. If the comparison voltage is higher than the threshold, the controllable switch is closed such that the SPD in series with the switch is effectively connected between the two current conductors to divert the surge current through the SPD. If the comparison voltage is lower than the threshold the switch remains open.

Abstract: A converter arrangement (C.5, C.7, C.8, C.9, C.11, C.12) with at least two single LLC converters (L), a pulse generator (2) per single LLC converter (L) wherein each pulse generator (2) is configured to supply switching pulses to one single LLC converter (L) and an output controller (11) configured to use switching frequency control and/or phase-shift control to control the pulse generators (2) comprises a load balancing control (7.5, 7.7, 7.8, 7.9, 7.11, 7.12) for overcoming unbalanced loading of the converter arrangement (C.5, C.7, C.8, C.9, C.11, C.12).

Abstract: The invention relates to a method for operating a power converter (1), preferably a solar inverter, for feeding a load current (Iload) into a grid (3). The method includes the steps of determining the load current (Iload), monitoring an output voltage (Uout) of the power converter (1), and controlling the load current (Iload), to avoid that the output voltage (Uout) exceeds a voltage limit (Uout,lim), wherein the voltage limit (Uout,lim) is adjusted in dependency of the load current (Iload). Furthermore the invention relates to a corresponding power converter (1) for connecting to a grid (3), preferably it relates to a solar power converter. This power converter (1) includes a load current sensor (142), an output voltage sensor (143) and a load current controller (141).

Abstract: A converter transformer (7) with a primary winding and a secondary winding, an integrated current transformer arranged to measure a winding current of the converter transformer, and a synchronous rectifier (11, 12) connected to the secondary winding of the converter transformer are provided. A controller is arranged to close respectively to open the synchronous rectifier depending on the measured winding current. The controller is arranged to close and/or to open the synchronous rectifier as a function of the winding current at a later and/or at an earlier time, whereby the time difference between the later and the earlier time is linearly dependent on the winding current difference, particularly to optimize a discharge process, and/or that an auxiliary supply circuit is arranged to provide auxiliary supply power, wherein the auxiliary supply circuit is arranged to derive auxiliary supply power from the integrated current transformer, in particular in overload situations.

Abstract: Several new and useful features for a magnetic structure are provided. One feature is that the magnetic structures are configured to help minimize the winding's AC losses, improving the system's efficiency. Another feature is that the combination of different magnetic hats creates a shaping path for the magnetic field. Still another feature is that a magnetic hat concept can be applied to a variety of magnetic core shapes.

Abstract: A controller for determining the duty-ratio for a pulse width modulator of a converter includes an inner current loop, an outer voltage loop and a multiplier with an input voltage feed forward to connect both loops. A prediction unit determines a correction signal icor that is added to the reference current iref by means of an adder and it further determines a sample correction signal to correct the current samples in the current loop. This error-controlled duty-ratio prediction with sample correction results in an improved total harmonic distortion as well as in an improved power factor of the converter.

Abstract: A choke for an EMI filter is provided. The EMI filter includes a first filtering circuit and a second filtering circuit. The choke includes a magnetic core assembly and four winding coils. The magnetic core assembly includes a first magnetic core and a second magnetic core. The first winding coil and the second winding coil are directly wound around the first magnetic core. The third winding coil and the fourth winding coil are directly wound around the second magnetic core. The first winding coil is serially connected with a first positive path of the first filtering circuit. The second winding coil is serially connected with a second positive path of the second filtering circuit. The third winding coil is serially connected with a first negative path of the first filtering circuit. The fourth winding coil is serially connected with a second negative path of the second filtering circuit.

Abstract: A stencil assembly structure is used for printing solder paste on a printed circuit board. The stencil assembly structure includes a stencil and a fixing frame. The stencil includes plural first apertures and plural second aperture. The plural first apertures are collaboratively defined as a solder paste printing region. The fixing frame includes a frame body and plural guide pins. After the plural guide pins of the frame body are penetrated through the corresponding second apertures of the stencil, the stencil is fixed on the frame body. The guide pins have respective perforations, and a wire is penetrated through the perforations. By selectively loosening or tightening the wire, a tension of the stencil is adjustable.

Abstract: A boost PFC converter includes a rectifier, a converter and an output stage comprising an output capacitor where the DC output voltage is provided across the output capacitor. The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements are thyristors and where the lower two are diodes. In that the thyristors are controlled such as to be open for only a part of each half period of the input voltage, the amount of current per half period that is passed to the output capacitor is controllable and can be made very small. Accordingly, the charge current for precharging the output capacitor can be controllably limited such that a bulky precharge resistor is not required anymore to avoid high inrush currents.

Abstract: A power supply unit (1) that is to be connected to different types of power supply networks includes an input (2) to receive AC power from the power supply network and an output (3) for providing power to an electrical device. The electrical device may for example be a computer, a telecom infrastructure device, inductive cooking/heating systems or an on-board charger of an electrical automotive vehicle. The power supply unit (1) includes at least two converters (4) that are connected between the inputs (2) and the output (3) and it further includes a controllable switching arrangement (5). The switching arrangement (5) includes a number of controllable switches (6) to controllably connect the converters (4) in different configurations to the input (2) and therefore also controllably to different supply lines of the power supply network.

Abstract: In a method for detection of an arc in a current path of a converter arrangement (2) for converting a DC input power to an output power, an arc is detected by sensing the current (4) in the current path by means of a current transformer (11), filtering the current signal (4?) with an analog band pass filter (14), converting the analog filtered current signal (4?) into a digital current signal (4??), determining the harmonic content (19) of the digital current signal (4??) and then deciding whether an arc exists if the harmonic content (19) exceeds a threshold, where the threshold is determined at the beginning as a multiple of the average harmonic content during a certain period of time of the current signal.

Abstract: In a converter for converting energy from a generator to a power network, wherein the converter comprises multiple power modules, wherein each power module includes at least two power cells and a transformer for connecting the power cells to the power network, wherein each power cell includes a phase input, a phase output, a transformer output connected to the transformer, a rectifier circuit and an inverter, the transformer (T) of a power module (4.1, . . . , 4.n) includes one generator-side winding (10) for each of the power cells (5) and exactly one common grid-side winding for balancing an energy flow through the power cells (5) of a power module (4.1, . . . , 4.n).

Abstract: A resonant converter comprises first and second input terminals (1, 2) to connect a voltage source (VBulk). A series connection of a first switch (S1) and a second switch (S2) is connected between the input terminals. A resonant circuit with a resonant inductance, at least one resonant capacitor (C1, C2, Cs), and at least a primary winding of a transformer (T1, T1—a, T1—b) is connected to the common Terminal of the first switch (S1) and the second switch (S2). A diode (D3) is connected in conduction direction from the first input Terminal (1) to the clamping capacitor (Cclamp). Another diode (D4) is connected in conduction direction from the clamping capacitor (Cclamp) to the second input terminal (2). A comparator (5) is connected across the clamping capacitor (Cclamp). The comparator (5) is further connected to a pulse control unit (3) to control the first and second switches (S1, S2).

Abstract: A new and useful cable plug is provided, that is configured for a socket-plug system connecting a PSU to a load device over a 2 wire cable. The cable plug is selectively moveable to one of a plurality of positions for selecting a predetermined output voltage (or other operational characteristic) for the load device In addition, a new and useful socket is provided, that is configured to mate with the cable plug, to provide the selected output voltage (or other operational characteristic) for the load device.

Abstract: A forward converter comprises a magnetic component with a transformer and a filter output inductor. Also disclosed is a method for assembly of a forward converter. A first and a second U/UR core are arranged to form an O-core. Windings of the transformer are arranged on the O-core. A bobbin-less U/UR core is arranged to abut the O-core, and windings of a filter output inductor are arranged directly on a body section of the bobbin-less U/UR core. Alternatively, windings of the transformer are arranged on a first section of an E/ER core, and windings of the filter output inductor are arranged directly on a second, bobbin-less section of the E/ER core.

Abstract: A device for locking a unit (2) in a holder (1), having a first locking element (3), which has a first latching element (4) and is contained by the unit (2), and having a second locking element (5), which has a second latching element (5) and is contained by the holder (1), wherein at least one of the locking elements (3, 5) is mounted in a movable manner and can be subjected to force for the purpose of locking the two latching elements (4, 5), and wherein the locking device comprises a first stop (18), for limiting maximum deflection of the movable locking element (3), the locking device comprises a second stop (19), for limiting overlapping of the two latching elements (3, 5) in the locked state.