The invention improves efficiency of a DC-DC converter. When it is determined that a high-voltage battery is not being charged in Step S1, a switching frequency of a switching circuit of the DC-DC converter is set in Step S4 based on an output current of t...

Disclosed is a charger including a first rectifying portion that rectifies an alternating power and outputs the rectified power to a neutral point of a 3-phase motor; a second rectifying portion/inverter that charges output power of the first rectifying po...

A lithium ion battery (11) is connected in parallel to a lead acid battery (9) charged with electric power generated by a generator (2). The lithium ion battery (11) has internal resistance smaller than internal resistance of the lead acid battery (9) and ...

The vehicle has a voltage source (1), control electronics (2) and an electric drive (4) and can be operated with electrical voltage sources with different rated voltages. The control electronics can be operated with electrical voltage sources with differen...