A charging system for electric vehicles includes a line interphase transformer, LIT-based rectifier configured for connecting an input of the LIT-based rectifier to an AC medium-voltage power signal and for outputting a medium-voltage DC-signal; a modular DC/DC converter with large step-down gain is configured for transforming the medium-voltage DC-signal into a medium-voltage HF-AC-signal; and a medium-frequency transformer, MFT, is configured for transforming the medium-voltage HF-AC-signal into a low-voltage HF-AC-signal for the at least one charging box.

A persistent DC circuit breaker provides a persistent single or dual DC voltage for a power distribution circuit coupled to a power panel. A control mechanism ensures a constant and consistent DC power output from the persistent DC circuit breaker. The persistent DC circuit breaker can replace an AC circuit breaker to convert an AC power panel into a coexisting AC and DC power panel or an entire DC power panel.

A system is described that turns off a high power, power supply when a device no longer needs high power. A low power, power supply or a rechargeable battery provides power to determine when the device again needs high power. The low power supply consumes a minimum possible power when the device does not need high power and the power rechargeable battery is not charged. That is, the high power and low power, power supplies are turned on or off based on the real time power consumption need of the device and the charged state of the battery. The power need of the device is monitored by a current shunt monitoring circuit and a control signal monitoring circuit.

A system is described that turns off a high power, power supply when a device no longer needs high power. A low power, power supply or a rechargeable battery provides power to determine when the device again needs high power. The low power supply consumes a minimum possible power when the device does not need high power and the power rechargeable battery is not charged. That is, the high power and low power, power supplies are turned on or off based on the real time power consumption need of the device and the charged state of the battery. The power need of the device is monitored by a current shunt monitoring circuit and a control signal monitoring circuit.

An electrical energy distribution system for a vessel or platform includes a plurality of DC buses, each DC bus coupled to a corresponding energy storage bus; each energy storage bus being coupled to a neighboring energy storage bus of the system through a first DC/DC converter. The plurality of energy storage buses are connected together to form a ring. Each energy storage bus is further coupled to an energy store through a second DC/DC converter.

An electrical energy distribution system for a vessel or platform includes a plurality of DC buses, each DC bus coupled to a corresponding energy storage bus; each energy storage bus being coupled to a neighboring energy storage bus of the system through a first DC/DC converter. The plurality of energy storage buses are connected together to form a ring. Each energy storage bus is further coupled to an energy store through a second DC/DC converter.

A power receiving circuit, a power transmitting circuit, an apparatus, and a feed system are disclosed. The power receiving circuit receives power in a noncontact manner, and comprises an LC parallel resonant circuit and a reactance element that is electrically connected in series to the LC parallel resonant circuit. The reactive element may be a capacitive or inductive element. In effect, a coil or capacitor in the LC parallel resonant circuit and the reactance element define another LC resonant circuit, namely, an LC series resonant circuit. The power transmitting circuit transmits power in a noncontact manner, and in one example, may also include a similar configuration.

A handheld device includes an electronic instrument and a capacitive power supply for storing and delivering power to the electronic instrument. The capacitive power supply includes at least one capacitor, and an electronic circuit operable to boost a voltage from the capacitor to a higher voltage for use by the electronic instrument. The capacitive power supply can be rapidly recharged. Some configurations include an accelerometer which permits the handheld device to detect movement and perform various operations responsive to detected movement. A dual charging station is also disclosed.

A method and apparatus are provided for determining, by a wireless power transmitter, whether a wireless power receiver is removed from a wireless power network managed by the wireless power transmitter. The method includes transmitting a command signal to report power information of the wireless power receiver at stated periods; determining whether a report signal corresponding to the command signal is received from the wireless power receiver; and determining that the wireless power receiver is removed from the wireless power network, if the report signal is not received after transmitting the command signal a predetermined number of times at the stated periods.

A method and apparatus are provided for controlling wireless power in a wireless power network managed by a wireless power transmitter. The control method includes registering a wireless power receiver to a wireless power network corresponding to the wireless power transmitter; applying a charging power for charging the wireless power receiver to a resonator of the wireless power transmitter; detecting a change of magnitude of power applied to the resonator; detecting that a communication unit of the wireless power transmitter fails to receive a communication signal from the wireless power receiver a predetermined time; and in response to detecting the change of the magnitude of power applied to the resonator and that the communication unit fails to receive the communication signal from the wireless power receiver in the predetermined time, removing the wireless power receiver from the wireless power network.