A power convertor configured to output power to an electrofusion welding coupler for performing electrofusion welding. The power convertor comprises an array of connected DC to DC power convertor circuits. In use, the array of connected DC to DC power convertor circuits is configured to receive, at a first interface, power at a first voltage level from a battery and output power, at a second interface, at a second voltage level to provide power to electrofusion welding cable means. The DC to DC power convertors are arranged in a buck-boost configuration which can operate in a boost mode in which the first voltage level is less than the second voltage level and in a buck mode in which the first voltage level is greater than the second voltage level.

A hydrogen production power supply system is provided by the present disclosure, wherein two stage conversion modules are arranged between the power supplies, and each output end of the second stage conversion module is connected to a power supply end of each hydrogen production device, respectively, so that independent power supply is provided for each hydrogen production device, which eliminates the loss of gas production caused by the non-uniform load among the hydrogen production devices. In addition, being different from the conventional technology, it is unnecessary for the hydrogen production power supply system to adapt the voltage by using a customized power frequency converter in the present disclosure. Therefore, the path loss issue can be avoided.

A method of controlling charge of a vehicle battery includes: determining, by a control unit, whether a high voltage battery and a low voltage battery are charged in a first charging mode, a second charging mode, or a third charging mode; and charging at least one of the high voltage battery or the low voltage battery by controlling a first full-bridge circuit unit, a second full-bridge circuit unit, and a low voltage direct current (DC) converter unit based on the determined first, second or third charging mode.

In described examples, a power management circuit includes a voltage sensor and a differential power converter. The voltage sensor is coupled in series with other voltage sensors between a high voltage bus and a ground bus. The voltage sensor senses a voltage across an impedance and outputs a control signal in response to the sensed voltage. The differential power converter is coupled in series with other differential power converters and in parallel with a load between the high voltage bus and the ground bus. The differential power converter is configured to increase or decrease a supplied current in response to a change in magnitude of the control signal.

A multi-stage driver system includes a switched mode power circuit for providing power to different electrical load(s). Multi-stage driver system includes a control block including at least one microcontroller coupled to control operations of the switched mode power circuit. Switched mode power circuit includes a high voltage region, a low voltage region, and an isolation barrier. High voltage region of the switched mode power circuit includes a switched rectifier and a switched bridge circuit configured to produce a high voltage bidirectional pulse train signal for output to an isolation barrier. Low voltage region of the switched mode power circuit includes a rectification circuit coupled to the isolation barrier and at least one switched converter circuit coupled to the rectification circuit. Control block receives real-time input signals (e.g., analog voltage reading(s)) from the high and low voltage regions and responsively produces control signals to the high and low voltage regions.

A power supply circuit is provided with: an AC voltage supply part; and one or more Cockcroft-Walton circuits. The one or more Cockcroft-Walton circuits include a plurality of output terminals and are supplied with an AC voltage from the AC voltage supply part. The plurality of output terminals are configured to output different DC potentials for each output terminal according to a magnitude of the AC voltage.

The present embodiments relate to an inductor device, a filter device and a steering assist device. The inductor device can comprise: a core including a magnetic material; and a wire which is wound around the core and which includes a low resistance material.

A solar control device controls a solar power generation system having at least one first group including a solar panel and a first DC/DC converter and at least one second group including a second DC/DC converter and a battery. The solar control device includes an electronic control unit that sets an output command value for the second DC/DC converter such that the output command value periodically switches between a first value and a second value that is smaller than the first value, when an output of the second DC/DC converter is equal to or smaller than a threshold value, and determines that the second DC/DC converter is abnormal when the output command value and the output of the second DC/DC converter satisfy a predetermined condition.

A motor driving system includes first and second motors including multiple first windings and second windings; a first inverter including a DC terminal connected to a DC voltage source and an AC terminal connected to the multiple first windings; a first switch part including a plurality of first mode change switches connected to the multiple first windings; a second inverter including a DC terminal connected to the DC voltage source and an AC terminal connected to the plurality of first mode change switches; a second switch part including a plurality of second mode change switches connected to the AC terminal of the second inverter and the multiple second windings; a third switch part including a plurality of third mode change switches connected to the multiple first windings; and a controller configured to control the short-circuited state or the open state of the multiple first mode, second and third mode change switches, based on whether the first and the second motors are driven.

The present disclosure relates to an apparatus for adjusting AC-DC converter output voltage, the apparatus includes a plurality of ports, an AC-DC converter circuit, a plurality of DC-DC converters coupled to a plurality of controllers, where the plurality of controllers coupled to corresponding plurality of ports to operate the one or more loads, wherein at least one controller is a master controller and the other plurality of controllers are slave controllers. The master controller configured to determine, from the slave controllers power levels for each port, calculate an optimal input voltage value for the DC-DC converters and communicate the calculated value to the AC-DC converter circuit through a constant current source to regulate the amount of DC voltage that is being supplied to the DC-DC converters to operate the one or more loads, thereby leading to improved system efficiency of multiport USB based power adapter.