Battery power supply with automatic load sensing

摘要

A battery power supply with extended shelf-life is composed of a plurality of batteries connected in series with a switching element and voltage booster. The switching element is composed of a transistor in parallel with a passive component that produces a voltage drop when the transistor is off. The voltage booster maintains an output voltage at set value when battery capacity deteriorates. A micro-controller is used to monitor voltage potentials to detect the presence of an external load. When no load is detected, all active components are disabled to conserve energy and avoid self-discharge.

主权项

1. A battery power supply with automatic load sensing, for extending battery life in an auxiliary power supply which can be connected to a load, comprising:
a battery portion having a positive side and a negative side; a controllable ON-OFF portion; said controllable ON-OFF portion being in series with said positive side of said battery portion, and having an ON state and an OFF state; a voltage booster having an inductor, said voltage booster being in series with said controllable ON-OFF portion; a pair of voltage dividers respectively disposed on opposite sides of said controllable ON-OFF portion, for providing first and second sense voltages before and after said controllable ON-OFF portion; a micro-controller having inputs receiving said first and second sense voltages, and said micro-controller having a booster enable output for controlling said voltage booster and an FET control output for controlling said controllable ON-OFF portion; said micro-controller having an active mode and a sleep mode; and said micro-controller being capable of switching itself between said sleep mode and said active mode, and between said active mode and said sleep mode.