Abstract: A data storage device requires a nominal input supply voltage, within a range having upper and lower tolerance limits in which stored data is retained. A capacitor is coupled to the data storage device. A supply voltage has a voltage greater than at least the upper tolerance limit. A regulator energized by the power supply provides a regulated voltage to the data storage device and the capacitor, the regulator presenting a low leakage discharge path for the capacitor. A feedback circuit is coupled to the regulated voltage and the regulator, the regulated voltage being held, preferably precisely held, at a voltage level between the nominal input supply voltage and the upper tolerance limit. The capacitor energizes the data storage device following an interruption of power from the power supply, discharging very slowly through the low leakage discharge path. The stored data is retained for an extended period of time.

Abstract: A method and apparatus for apportioning standby power implements a first transition mode between standby and run modes of operation in which a control circuit is energized by a standby power supply in a fully active state and generates an on/off command signal responsive to detection of an input signal and a second transition mode between the standby and run modes of operation in which the control circuit is energized by the standby power supply in a partially active state and generates the on/off command signal and a drive signal generator is fully energized by the standby supply. An intermediate transition mode may also be implemented between the first and second transition modes, in which the control circuit and the generator are both energized in a fully active state for a brief interval by the standby power supply and an auxiliary energy source.