A charging system for a vehicle includes: a power transmitter transmitting power for charging a battery of a vehicle; a charger including a three-phase motor and inverter, and receiving the power from the power transmitter; an input voltage calculating processor selecting any one of a plurality of predetermined duty ratios and calculating a value of an input voltage supplied to the charger based on the selected duty ratio and a voltage value of the battery of the vehicle; an input current calculating processor calculating a value of an input current based on the calculated value of the input voltage and a value of the power transmitted by the power transmitter; a power transmission controller instructing the calculated input current to be input to the charger; and a charging controller instructing the battery of the vehicle to be charged.

A charging system for a vehicle includes: a power transmitter transmitting power for charging a battery of a vehicle; a charger including a three-phase motor and inverter, and receiving the power from the power transmitter; an input voltage calculating processor selecting any one of a plurality of predetermined duty ratios and calculating a value of an input voltage supplied to the charger based on the selected duty ratio and a voltage value of the battery of the vehicle; an input current calculating processor calculating a value of an input current based on the calculated value of the input voltage and a value of the power transmitted by the power transmitter; a power transmission controller instructing the calculated input current to be input to the charger; and a charging controller instructing the battery of the vehicle to be charged.

A power generation unit includes a motor generator having a rotor with magnet, and a stator with coils driven in a plurality of phases, the coils of the respective phases not being connected to each other; and a driving control part that performs control so that a coil of each phase of the stator is brought into any one of a first state in which torque is generated by the rotor, a second state in which both ends of the coil are electrically released, and a third state in which both ends of the coil are short-circuited.

A battery charging apparatus for a vehicle includes a driver, a position detector, and a controller. The driver includes switching elements to convert three-phase AC power outputted from a winding of each phase of a stator of a three-phase AC generator into DC power to supply the DC power to a battery. The position detector is configured to output a position detection signal indicating a position of a rotor of the three-phase AC generator. The controller is configured to control the switching elements to be switched between an energized state and non-energized state. The controller is configured to have a maintenance period during a period until next input of the position detection signal if the period exceeds an energization period. The switching elements are to be maintained in the maintenance period in the energized state or non-energized state immediately before the period exceeding the energization period.

The present invention creates an electrical filter circuit (100) for an electric drive (200), wherein the filter circuit (100) comprises an x-capacitor (CX_i), a first and a second y-capacitor (CY1_i, CY2_i). The x-capacitor (CX_i) is connected between a first and the third filter output terminal (212, 216), or a first and a third filter input terminal (213, 217), and the first y-capacitor (CY1_i) is connected between the third filter output terminal (216) or the third filter input terminal (217) and a reference potential or ground. The second y-capacitor (CY2_i) is connected between the second filter output terminal (214) or the second filter input terminal (215) and a reference potential or ground.