CURRENT SUPPLY CIRCUIT ARRANGEMENT

A circuit arrangement for the supply of emergency current in the case of a mains failure, comprises an electrolytic capacitor which is connected through a diode to a charging voltage which is higher than the required output voltage. The new current supply circuit arrangement avoids energy losses as far as possible and guarantees a sufficiently rapid availability of the energy to be stored in the electrolytic capacitor in that the capacitor charging voltage is derived from an auxialiary voltage source. In a further embodiment, a transistor is connected between the electrolytic capacitor and the output terminal of the current supply circuit and is operated in the inverse mode in order to precharge the electrolytic capacitor with a base charge. This current supply circuit arrangement can be used for the emergency current supply of microcomputer systems.