Patent ID: 7747331

Claim:
An active implantable medical device, comprising: a principal circuit; an auxiliary RF telemetry circuit; a supply battery having an internal resistance; a voltage multiplying stage comprising a plurality of condensers connected by a plurality of switches for multiplying a voltage delivered by the supply battery by charging the plurality of condensers; and a regulating circuit comprising an accumulator, the accumulator having a load level and being connected to a load circuit, wherein the supply battery, while providing power to the principal circuit with a first voltage, charges the plurality of condensers of the voltage multiplying stage during a first phase of a variable period and charges the accumulator to a second voltage by changing connectivity among the plurality of condensers using the plurality of switches during a second phase of the variable period; wherein the load circuit detects a terminal voltage of the accumulator; and wherein the accumulator delivers power with the second voltage to the auxiliary RF telemetry circuit, and the load circuit maintains the accumulator at a predetermined load level by varying the variable period and/or controlling at least one switch of the plurality of switches of the regulating circuit in response to the detected terminal voltage of the accumulator.