Electrical power supply circuit, in particular for portable appliances

摘要

An electricity power supply circuit for an external appliance whose consumption varies over time. The circuit comprises an electrochemical cell, a supercapacitor serving as a source of electricity for said appliance, and a chopper voltage converter between the cell and the supercapacitor, the converter serving to charge the supercapacitor at constant current while monitoring the voltage across the terminals thereof. The circuit is applicable to cellular radiotelephones.