A system and method for providing power to independent movers traveling along a track in a motion control system without requiring a fixed connection between the mover and a power source external to the mover. In one embodiment, a sliding transformer transfers power between the track and each mover. In another embodiment, an optical transmitter transfers power between the track and an optical receiver mounted on each mover. In yet another embodiment, a generator includes a drive wheel engaging the track as each mover travels along the track. A power converter on the mover receives the power generated on and/or transmitted to the mover to control an actuator or a sensor mounted on the mover or to activate drive coils mounted on the mover to interact with magnets mounted along the track and, thereby, control motion of each mover.

A resonant inverter of a power supply for electric vehicle includes a first resonant capacitor and a switching element cutting off a current flowing in a resonant circuit and generates first alternating-current power from direct-current power. The transformer is included in a part of the resonant circuit, supplies the first alternating-current power generated by the resonant inverter to a first winding, and supplies second alternating-current power after conversion of the first alternating-current power to a load from a second winding. A control unit confines a difference between a resonant frequency of the resonant circuit and a switching frequency of the switching element to a predetermined range to cause that a current flowing in switching of the switching element to at least the first winding or the second winding is equal to or less than a predetermined value and to cause the resonant inverter to perform soft switching.

A resonant inverter of a power supply for electric vehicle includes a first resonant capacitor and a switching element cutting off a current flowing in a resonant circuit and generates first alternating-current power from direct-current power. The transformer is included in a part of the resonant circuit, supplies the first alternating-current power generated by the resonant inverter to a first winding, and supplies second alternating-current power after conversion of the first alternating-current power to a load from a second winding. A control unit confines a difference between a resonant frequency of the resonant circuit and a switching frequency of the switching element to a predetermined range to cause that a current flowing in switching of the switching element to at least the first winding or the second winding is equal to or less than a predetermined value and to cause the resonant inverter to perform soft switching.

Systems and methods for charging an electric bus having a charging interface on its roof may include determining that an approaching bus is supposed to be charged at the charging station, lowering the charging head of the charging station to land on the roof of the bus, and moving the bus with the charge head on its roof to engage the charging head with the charging interface.

A power transmitter module is disclosed. In embodiments, a power transmitter module includes a module LC input filter configured to receive regulated DC current, a module transmitter circuit configured to receive the regulated DC current from the module LC input filter and generate a high-frequency AC current. A power transmitter module further includes a module transmitter coil and compensation circuit comprising a transmitter coil, and a first capacitor in parallel with the transmitter coil. The module transmitter coil and compensation circuit are configured to receive the high-frequency AC current from the module transmitter circuit and generate a time-varying magnetic field emitted from the transmitter coil. Additionally, a power transmitter module further includes a module controller configured to receive a power transmission input signal and further configured to control a state of the module transmitter circuit based on the power transmission input signal.

A DC traction sub-station for supplying at least one vehicle, preferentially a railway vehicle, with a direct current, including a first terminal connecting the DC traction sub-station to an alternating current electrical power grid, a second terminal connecting the DC traction sub-station to a power supply conductor in order to provide driving current to the at least one vehicle or to receive regenerative braking current from the at least one vehicle, a third terminal connected to an energy storage device, one or more first current supply chains electrically connecting the first terminal to the second terminal, wherein the first current supply chain includes a first AC/DC converter, and one or more second current supply chains electrically connecting the first terminal to the third terminal, wherein the second current supply chain includes a second AC/DC converter, and wherein a DC/DC converter electrically connects the second terminal to the third terminal.

A power transmitter according to an aspect of the present disclosure includes a first coil to wirelessly transmit power to a second coil of a power receiver; a converter to receive direct current (DC) power, convert the DC power into alternating current (AC) power, and supply the AC power to the first coil; and a controller to execute power control for causing power supplied to a load to approach desired power. The controller executes frequency control of the AC power and at least one control of phase shift control of the converter and voltage control of the DC power as the power control. When the power supplied to the load cannot be caused to approach the desired power by the frequency control, the controller executes at least one of the phase shift control and the voltage control.

A power transmitter according to an aspect of the present disclosure includes a first coil to wirelessly transmit power to a second coil of a power receiver; a converter to receive direct current (DC) power, convert the DC power into alternating current (AC) power, and supply the AC power to the first coil; and a controller to execute power control for causing power supplied to a load to approach desired power. The controller executes frequency control of the AC power and at least one control of phase shift control of the converter and voltage control of the DC power as the power control. When the power supplied to the load cannot be caused to approach the desired power by the frequency control, the controller executes at least one of the phase shift control and the voltage control.

A vehicle to be driven by electric power which is wirelessly transmitted from a power transmitter having two transmission electrodes includes: two reception electrodes to receive AC power from the two transmission electrodes through capacitive coupling respectively with the two transmission electrodes; a power receiving circuit which is connected to the two reception electrodes to convert AC power received by the two reception electrodes into DC power or another form of AC power, and supply the DC power or other form of AC power to an electric motor which drives the vehicle; and a control circuit which, while the vehicle is traveling over the two transmission electrodes, increases an impedance of the vehicle as viewed from the power transmitter when a value of at least one of power, voltage and current in the power receiving circuit, or a change rate over time thereof, exceeds a threshold value.

A motor vehicle with at least one energizable active current line, which at least sometimes carries an active current for the operation of at least one electrical consumer. At least one attenuation line layout is coupled by way of an inductive coupling to the energizable active current line in such a way that, in a protection area spaced apart from the active current line and the attenuation line layout, a magnetic field generated by the active current and/or a perturbation superimposed on the active current and/or a leakage current produced by the active current is attenuated by current flow induced in the attenuation line layout.