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.

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.

A device for power factor correction can include a converter housing having an inner surface; a first converter substrate mounted on the inner surface of the converter housing; a second converter substrate mounted on another surface of first converter housing opposite to the inner surface; and a housing cover covering the first converter substrate and coupled to an upper surface of the converter housing, in which the second converter substrate includes a first surface having a first region including a source pad, and a second region including a drain pad spaced apart from the source pad, the source pad including a source pad extension portion extending into the second region; and a second surface including a heat dissipation pad for communicating heat from the source and drain pads to an outside of the device, in which the first region of the second converter substrate overlaps with the another surface of first converter housing, and the second region of the second converter substrate faces the housing cover without overlapping with the first converter substrate.

A switch circuit includes n switching elements (n≥2) connected in series between an input node and an output node. A control device is configured to convert DC power in a power storage device into AC power synchronized with AC power supplied from an AC power supply during a normal state and supply the AC power to the output node, by controlling a power converter, when an abnormality of at least one of the AC power supply and the switch circuit is sensed in a state where the control device outputs conduction commands for the n switching elements. The control device is further configured to produce cutoff commands for cutting off the n switching elements during execution of power conversion in the power converter, and sense a cutoff abnormality of the switch circuit based on terminal-to-terminal voltages of the n switching elements during production of the cutoff commands.

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.

A power source equipment is configured to provide a power to a powered device in a power over Ethernet. The power source equipment includes a first port, a second port, and a control circuit. The first port is configured to perform a power classification on the powered device, and provide a first voltage to the powered device in a first stage. The second port is configured to provide a second voltage to the powered device in a second stage. The control circuit is configured to disable the second port in the first stage, and configured to control the second port to output the second voltage and increase the first voltage in the second stage.

A bidirectional power converter includes flyback converter units connected in parallel, each having a controller and adapted to accumulate power from a primary side during an ON time and to deliver the accumulated power to a secondary side during an OFF time, the primary and secondary sides being interchangeable as to the direction of power conversion, the controller operating at a boundary between discontinuous and continuous conduction modes and performing valley switching when switching from OFF to ON, one converter unit operating as a master wherein the controller is adapted to control the length of ON time in order to feedback-control an overall current output of the converter, and each other converter unit operating as a slave wherein the controller controls the length of ON time in order to feedback-control a phase delay of ON time of the slave relative to ON time of another converter unit.

Synchronous rectification in active clamp flyback power converters. At least some example embodiments are methods including: sensing a first slope of voltage on a secondary winding of the transformer, the first slope indicative of the power converter entering a charge mode of the transformer; modifying, responsive the sensing, an operational state of a secondary rectifier (SR), driver coupled to a secondary rectifier; making the secondary rectifier conductive by the SR driver during a discharge mode of the transformer; sensing a second slope of voltage on the secondary of the transformer, the second slope indicative of ending of the discharge mode of the power converter; and then returning, responsive to sensing the second slope, the SR driver to an original operational state.

In accordance with an embodiment, a switched-mode power supply (SMPS) includes a transformer having a plurality of windings sharing a common core and a plurality of primary stages coupled in series. Each of the plurality of primary stages include a winding of the plurality of windings, a switch having a first node coupled to a first terminal of the winding, and a first capacitor coupled between a second terminal of the winding and a second node of the switch.

A transformer for a DC-DC converter, such as a resonant converter, is provided. The converter includes a transformer unit that includes at least one winding with a first winding connection and a second winding connection, and a capacitor assembly consisting of at least one capacitor with a first capacitor assembly connection and a second capacitor assembly connection. The capacitor assembly is arranged so as to lie against the transformer unit in order to form an assembly. The capacitor assembly connections are connected to the winding connections via one or more first connection parts in a specified manner with respect to the electric connections. The capacitor assembly connections and/or the winding connections are electrically connected to multiple second connection parts in a specified manner with respect to the electric connections for connecting to a first power module and a second power module.