A direct-current to direct-current (DC-DC) converter is provided for use in an electric vehicle. The DC-DC converter is configured to be used as either a resonant converter or a PWM converter in the electric vehicle. For example, the DC-DC converter may operate as a resonant converter in which a current is sequentially applied through a first conversion unit, a resonant tank, a transformation unit, and a second conversion unit. The DC-DC converter may further operate as a pulse width modulation (PWM) converter in which a current is sequentially applied through the second conversion unit, the transformation unit, and a third conversion unit.

A charging apparatus for an electric vehicle is disclosed. The charging apparatus includes an AC power input stage receiving at least one AC input power from among single-phase AC power and multi-phase AC power, a power factor corrector having full bridge circuits receiving AC input power, a link capacitor charged through the power factor corrector, a switch network having a first switch connecting any one of an AC power input line and a neutral line of the AC power input stage to the power factor corrector and at least one second switch connecting the AC power input stage to the power factor corrector or the link capacitor, and a controller controlling the power factor corrector and the switch network according to AC input power condition. The second switch includes switches selectively connecting at least one full bridge circuit to a positive(+) electrode of a battery.

This electrical energy distribution system comprises assembly of electrical energy generators each driven by a heat engine and supplying a distribution network; means for recovering the heat energy generated during the operation of the heat engines and for vaporizing a working fluid; steam turbine driven by the working fluid and associated with a generator connected to the distribution network for converting the recovered heat energy into electrical energy and at least one frequency converter arranged between the distribution network and an electrical load. It comprises means for controlling the frequency of the distribution network, where the flow rate of the vaporized working fluid is regulated to a maximum value.

A power conversion system for vehicles is provided. The system includes a switching circuit having first input/output terminals, second input/output terminals and a plurality of switching elements connected between the first input/output terminals and the second input/output terminals. A first energy storage device is connected to the second input/output terminals and has a preset charging/discharging voltage. A first voltage conversion circuit converts power output from the first input/output terminals to output a voltage less than the voltage of the first energy storage device. A second energy storage device is charged/discharged with the output voltage of the first voltage conversion circuit. A controller controls open/short-circuit states of the switching elements based on whether the first energy storage device is being charged and whether the vehicle is traveling. When the first energy storage device is being charged, AC charging power is provided to the first input/output terminals from outside of the vehicle.

There is provided an electric traction system, comprising: a step-down transformer comprising a primary winding for operatively coupling to an AC power supply and a secondary winding which is inductively coupled to the primary winding; a traction converter module comprising a first input terminal and a second input terminal which are operatively coupled to the secondary winding, and a plurality of AC-to-AC power converters, each of which comprises first and second input nodes, configured to receive AC power and output nodes configured to supply AC power, wherein the first and second input nodes, of the plurality of AC-to-AC power converters are electrically connected in series between the first input terminal and the second input terminal; and at least one electric motor configured to be driven by the traction converter module.

A control box for charging includes: a first connector connected to a supply cable having a plug, which is connected to an external power source, at a first end, and having a plurality of connection pins; and a control board having a first switch mounted therein and configured to control the first switch in a first state such that an input signal is transmitted to an output terminal of the control box when power is supplied in a first mode in which a signal is input from the first connector. In particular, the control board is configured to control the first switch in a second state to transmit and receive signals to and from a vehicle connected to the output terminal when power is supplied in a second mode in which a signal is not input from the first connector.

Provided relates to a transformer for an on-board charger (OBC) of an electric vehicle, the OBC of the electric vehicle being adapted to charge a high-voltage battery of the electric vehicle with commercial AC power (200V AC) supplied from an electric vehicle charger, the transformer including: a housing in which an insertion space portion is formed; a cover for opening and closing the insertion space portion of the housing; a flat plate type primary coil built in the insertion space portion of the housing and receiving current from the electric vehicle charger; and a plurality of flat plate type secondary coils built in the insertion space portion of the housing and generating induced current by means of magnetic induction of the current flowing to the primary coil, independently of one another, to supply the generated induced current to the high-voltage battery of the electric vehicle.

Provided relates to a transformer for an on-board charger of an electric vehicle, including a primary coil receiving power from the charger of the electric vehicle; and a secondary coil outputting induced current to the high-voltage battery, wherein the primary coil is formed by winding a first adhesive-coated rectangular wire in a coil shape, and the secondary coil is formed by winding the second adhesive-coated rectangular wire in a coil shape. The first and second adhesive-coated rectangular wires include: copper stranded wires formed by twisting multiple strands of copper wires and arranged to be in contact with each other; copper stranded wire rectangular bundles formed to have a rectangular shape of the arrangement of the copper stranded wires; insulating envelopes applied along the outer surface of the copper stranded wire rectangular bundles; and bonding layers formed by applying adhesive on the outer surface of the insulating envelopes.

The technology of this application relates to an arrangement for electric power conversion and dual electric drive, a system comprising the arrangement, a method of operating the arrangement, and a computer program for carrying out the method, which enable charging of dual-drive electric vehicles (EV) from a three-phase power grid without producing any torque, while making use of all the power electronics already existing for the traction system and the motor inductances. As such, space is saved and power density, efficiency and reliability are increased.

There is provided an electric traction system, comprising: a step-down transformer comprising a primary winding for operatively coupling to an AC power supply and a secondary winding which is inductively coupled to the primary winding; a traction converter module comprising a first input terminal and a second input terminal which are operatively coupled to the secondary winding, and a plurality of AC-to-AC power converters, each of which comprises first and second input nodes, configured to receive AC power and output nodes configured to supply AC power, wherein the first and second input nodes, of the plurality of AC-to-AC power converters are electrically connected in series between the first input terminal and the second input terminal; and at least one electric motor configured to be driven by the traction converter module.