a power interface is proposed , which keeps an adjustable power supply circuit in a conducting state even if the average current consumption of an attached load is below the adjustable power supply circuit &# 39 ; s holding current requirement . the power interface makes use of the dynamic properties of adjustable power supply circuits . due to the recovery time of the adjustable power supply circuit , it will stay in the conducting state even if there is no current flowing for a short while . the power interface makes use of this effect by interrupting and re - establishing a current flow from the adjustable power supply circuit .