AC/DC converter and its use in a telephone apparatus.

摘要

The converter circuit according to the invention comprises a linearising circuit (8), a programmable voltage regulator (12) governing the intermediate source voltage (4), and a DC-DC voltage converter (13) with cut-out. An input-voltage effective value detector (11) allows the intermediate source voltage (4) to be governed as a function of the input voltage. The reference voltage (7) fixing the output voltage (5) drops when the load at the output exceeds the energy capacity of the intermediate source. <IMAGE>