The charge control ECU (40) sets the decided operational voltage, as a target voltage (VR), to the charge converter (20) and then causes the charge converter (20) to resume its operation.

There is therefore no separate charging unit provided in the vehicle but instead the power converter (3) of the drive unit (1) is used as a charging or discharging power converter when there is a connection to a power supply system.

Each pixel sensor includes a capacitor, a plurality of light sensors, a charge converter and a transfer gate.

The charge packets of each of the pixels grouped together are added up in the charge/voltage converter (12) and the charge packets which have been added up are converted into the voltage values (U1 + U2) of each of the pixels grouped together.

Each pixel sensor includes a photodetector[46], a charge conversion circuit[34], and a gate transistor[36].

An amplifier module (101) is comprises a balanced-unbalanced converter (1), an unbalanced amplifier (2), and a filter (3).

The received electromagnetic energy is converted into electrical energy by the charging converting circuit (20) and then transmitted to the battery (2).

Each interchangeable charging device may be a charge converter device (40) for coupling to an AC or DC adapter or a battery charge device for containing at least one battery.

The number of photodiodes that are connected to the capacitor during the readout can be controlled to assure that the charge converter does not saturate.

At a certain output voltage, the charging converter takes out the power from the solar panel at two operating points where the power can be taken out from the solar panel and charges the storage battery.

A wireless charger (1) includes a coil (10) and a charging converting circuit (20) connected to the coil (10).

A charge control ECU (40) halts a charge converter (20) periodically or at a predetermined timing, and uses a voltage sensor (50) to determine an open-circuit voltage of a solar battery (30).

The operational voltage for the capacitive energy store can be regulated in a temperature-dependent manner to a constant or approximately constant value by means of a charge converter (13).