Abstract: A flux-corrected switching power converter includes a first transformer, a first switching stage, a controller, and a flux correction current source. The first transformer includes a first magnetic core, a first primary winding, and a first secondary winding, and the first switching stage is electrically coupled to the first secondary winding. The controller is configured to control switching of at least the first switching stage. The flux correction current source is electrically coupled to the first primary winding, and the flux correction current source is configured to inject current into the first primary winding to at least partially cancel magnetic flux in the first magnetic core that is generated by current flowing through the first secondary winding.

Abstract: A half bridge switching cell includes two primary switching elements and a transformer with primary and secondary windings. Synchronized rectifiers correspond to the primary switching elements such that each of the synchronized rectifiers conducts when the corresponding primary switching element is not conducting. Each secondary winding is connected to one of the synchronous rectifiers and to a common connection and controlled current source. The primary switching elements conduct during offset times separated by a dead time. A magnetizing current flows through the secondary windings and synchronous rectifiers during the dead time. The magnetizing current flows into the primary winding when each of the synchronous rectifiers is turned off after the dead time, discharging a parasitic capacitance across the one of the primary switching elements when the corresponding synchronous rectifier is turned off, thereby creating a zero voltage switching condition at turn on for the primary switching elements.

Abstract: An alternating current to direct current conversion circuit includes a rectifier circuit, a first DC to DC conversion module and a second DC to DC conversion module. The first DC to DC conversion module includes multiple power switches and an inductor and is coupled between the rectifier circuit and the second DC to DC conversion module. Multiple power switches in the first DC to DC conversion module are controlled to be turned on simultaneously, so that a voltage across each of the power switches in the first DC to DC conversion module is reduced. The alternating current to direct current conversion circuit includes no power switch with a high withstand voltage, so that the alternating current to direct current conversion circuit has a small volume, low switching loss, less energy loss, and good heat dissipation, thereby increasing power density.

Abstract: Disclosed herein is an improved flyback converter that separates the magnetic components of the converter into a transformer and a separate, discrete energy storage inductor. This arrangement can improve the operating efficiency of the converter by reducing the commutation losses as compared to a conventional flyback converter. The magnetic components may be constructed on separate magnetic cores or may be constructed on magnetic cores having at least one common element, thereby allowing for at least partial magnetic flux cancellation in a portion of the core, reducing core losses.

Abstract: A control circuit for a power converter comprising switching transistors and an output inductor is disclosed. One terminal of the output inductor serves as an output node, and another terminal of the output inductor serves as a switching node. The control circuit is configured to generate a control signal for controlling switching transistors in the power converter. The control circuit includes: a RC oscillator network connected to two terminals of the output inductor, the RC oscillator network configured to generate an oscillation signal containing a feedback ramp slope compensation component in response to a change in a voltage across the terminals of the output inductor; a comparator; an on-time generation circuit; and a control signal generation circuit to generate the control signal for controlling the switching transistors in the power converter.

Abstract: An alternating current to direct current conversion circuit includes N first power converters instead of a boost circuit including a power switch with a high withstand voltage. The N first power converters each have an input end and theses input ends are connected in series, to perform power factor correction. Therefore, the alternating current to direct current conversion circuit includes no power switch with a high withstand voltage, so that the alternating current to direct current conversion circuit has a small volume, low switching loss, less energy loss, and good heat dissipation, thereby increasing power density.

Abstract: A power converter converts a medium-voltage output from a solar module to an appropriate voltage to power a solar tracker system. The power converter includes a voltage divider having at least two legs, a first semiconductor switch subassembly coupled in parallel with a first leg of the voltage divider, and a second semiconductor switch subassembly coupled in parallel with a second leg of the voltage divider. The power converter may be a unidirectional or a bidirectional power converter. In implementations, the signals for driving the semiconductor switches of the first and second semiconductor switch subassemblies may be shifted out of phase from each other. In implementations, if the bus voltages to the semiconductor switches are not balanced, the pulse width of the driving signal of the semiconductor switch supplied with the higher bus voltage is decreased for at least one cycle.

Abstract: A synchronous average harmonic current controller for a line connected bidirectional resonant power converter results in a harmonic voltage gain closely related to the commanded bridge duty cycles. A primary bridge has its duty cycle set to achieve controlled line power transfer and voltage regulation of a primary bus energy storage capacitor. A secondary bridge circuit has its duty cycle set to achieve voltage regulation of secondary bus energy storage capacitor. A first embodiment uses the independent energy storage elements to achieve power factor correction and low noise regulation using a single stage. A second embodiment uses feedforward duty cycle control to achieve isolated voltage regulation using the well-defined voltage gain resulting from the synchronous average harmonic current controller.

Abstract: A communication control circuit for a power supply chip, can include: a main control die having a main control circuit; a plurality of sub-control dice configured to respectively receive a control signal sent by the main control die, where each sub-control die comprises a sub-control circuit; and where a reference ground of each sub-control die is different from a reference ground of the main control die, the reference grounds of the plurality of sub-control dice are different with each other, and communication between the main control die and each sub-control die is achieved by a corresponding level conversion circuit.

Abstract: A loss optimization control method for modular multilevel converters (MMCs) under fault-tolerant control is disclosed. The method includes the following steps: when a fault of a SM in a MMC occurs, bypassing the faulty SM to achieve fault-tolerant control; suppressing the fundamental circulating current using a fundamental circulating current controller; respectively calculating the loss of each SM in faulty arms and healthy arms by using loss expressions of different switching tubes in SMs of the MMC; aiming at the loss imbalance between the arms of the MMC, taking the loss of a healthy SM as the reference, adjusting the period of capacitor voltage sorting control in the faulty SMs, achieving the loss control over the working SMs in the faulty SMs, and finally achieving the loss balance of each SM in the faulty arms and the healthy arms. Compared with the conventional methods, the proposed method is easier to implement and does not increase the construction cost of MMCs.

Abstract: A DC-DC converter includes a first switching network that receives the input DC voltage and outputs a first AC voltage, a transformer, and a secondary side conversion circuit that receives the second AC voltage and outputs the output DC voltage. The transformer includes a first plurality of primary windings, a second plurality of primary windings and a plurality of secondary windings. The transformer is configured to receive the first AC voltage and outputting a second AC voltage. When the input DC voltage is intended to be used in a low voltage range, the first plurality of primary windings and the second plurality of primary windings are configured to be in parallel at the time the DC-DC converter is manufactured. When the input DC voltage is intended to be used in a high voltage range the first plurality of primary windings and the second plurality of primary windings are configured to be in series at the time of manufacture.

Abstract: A method for operating a DC-DC voltage converter apparatus having a plurality of DC-DC voltage converter units connected in parallel in an electrical network is provided. The DC-DC voltage converter units are operated in a master/slave configuration based on current mode control in order to set a desired output voltage. Here, a reference voltage, to which the output voltage is intended to be adjusted, for the slave converters is determined by way of a preconditioning function according to a predetermined calculation specification from a master reference voltage prescribed by the master converter. Stable control can therefore be ensured even in the case of fluctuating loading at the respective DC-DC voltage converter units.

Abstract: An alternating current (AC)-side symmetrically-split single-phase inverter for decoupling, which includes an H-bridge inverter, the H-bridge inverter includes an upper half-bridge structure and a lower half-bridge structure that are symmetrical to each other, the upper half-bridge structure includes an upper half-bridge first unit and an upper half-bridge second unit in parallel, the upper half-bridge first unit includes an insulated-gate bipolar transistor G1, a diode D1, and a capacitor C3 in parallel, the upper half-bridge second unit includes an insulated-gate bipolar transistor G3, a diode D3, and a capacitor C4 in parallel; and the lower half-bridge structure includes a lower half-bridge first unit and a lower half-bridge second unit in parallel, the lower half-bridge first unit includes an insulated-gate bipolar transistor G2, a diode D2, and a capacitor C1 in parallel, the lower half-bridge second unit includes an insulated-gate bipolar transistor G4, a diode D4, and a capacitor C2 in parallel.

Abstract: A power converter includes a first circuit including an inductor and configured to convert an input voltage into a first voltage, a second circuit including a transformer and configured to convert the first voltage input to the insulating transformer to a second voltage, a control circuit configured to control the first circuit, a first power supply circuit including a first winding magnetically coupled to the inductor and configured to output a third voltage generated by the first winding to the first control circuit, and a second power supply circuit including a second winding magnetically coupled to the transformer and configured to output a fourth voltage generated by the second winding to the first control circuit. When the second voltage is not output the third voltage is output to the control circuit, and when the second voltage is output the fourth voltage is output to the control circuit.

Abstract: A drive system (300) includes a plurality of power cells (312) supplying power to one or more output phases (A, B, C), each power cell (312) having multiple switching devices (315a-d) incorporating semiconductor switches, and a control system (400) in communication with the plurality of power cells (312) and controlling operation of the plurality of power cells (312), wherein the control system (400) includes a system on chip (410) with one or more central processing units (412, 414) and a field programmable gate array (416) in communication with the one or more central processing units (412, 414).

Abstract: A split DC (Direct Current) bus inverter architecture includes a positive DC bus, a negative DC bus, and a neutral node. It further includes a first capacitor between the positive DC bus and the neutral node. It further includes a second capacitor between the negative DC bus and the neutral node. It further includes a split phase output. A first output of a DC-DC converter is connected to the neutral node and a second output of the DC-DC converter is connected to one of the positive DC bus or the negative DC bus.

Abstract: A multi-phase control circuit and a temperature balance control method thereof The temperature balance control method of the multi-phase control circuit includes the steps of: acquiring a first temperature signal reflecting a representative temperature among a plurality of power stages, then acquiring a plurality of second temperature signals reflecting a respective temperature of each of the plurality of power stages; and adjusting a pulse width and/or frequency of a pulse width modulation signal of at least one of the plurality of power stages according to a comparison result between the first temperature signal and the second temperature signal so as to balance the temperatures of the plurality of power stages.

Abstract: A zero-voltage-switching control circuit for a switching power supply having a main power switch and a synchronous rectifier switch, is configured to: control the synchronous rectifier switch to be turned on for a first time period before the main power switch is turned on and after a current flowing through the synchronous rectifier switch is decreased to zero according to a switching operation of the main power switch in a previous switching period of the main power switch; and where a drain-source voltage of the main power switch is decreased when the main power switch is turned on, in order to reduce conduction loss.

Abstract: The present disclosure provides a power conversion device including an input end having positive and negative input terminals, two bridge arms, two transformers and an output capacitor. Each bridge arm is connected to the input end in parallel, and includes three switches coupled in series. Two terminals of one switch are electrically connected to the positive input terminal and a primary node respectively. Two terminals of another switch are electrically connected to the negative input terminal and a secondary node respectively. Each transformer includes primary and secondary windings coupled to each other. Two primary windings are serially coupled between two primary nodes. Two secondary windings are serially coupled between two secondary nodes. Two terminals of the output capacitor are electrically connected to output positive and negative terminals respectively.

Abstract: The objective is to provide a function of detecting loss of a current detection function, at a time when a switching device has an open failure, in an arm that has the current detection function and a temperature detection function and in which two or more switching devices are connected in parallel with one another. A switching apparatus includes a current detector and a temperature detector provided in at least one of the two or more switching devices that are connected in parallel with one another and a controller that determines an overcurrent in the switching device in which the current detector is provided, that determines an overheating state and a temperature-rising failure in the switching device in which the temperature detector is provided, based on an output of the temperature detector, and that controls the switching devices.