SIMPLE_CIRCUIT_TO_DISCONNECT_LOAD_FROM_BATTERY

Published:2009/7/17 2:31:00 Author:Jessie | From:SeekIC

To prevent battery damage, the circuit disconnects the load at a predetermined level of load voltage. This level (Vtrip, closely proportional to the battery voltage) is determined by R1 and R2 so that the voltage at pin 3 of IC1 equals 1.15 V: Vtrip = 1.15 V(R1 + R2) /R1 The allowed range for Vtrip is 2 V to 16.5 V. The load-battery connection remains open until the system receives a manual reset command. Pressing Reset (or pulling pin 3 above 1.15 V with a transistor) reconnects the load after the battery is recharged or replaced. Battery drain with the load disconnected is only 5 μA, so the circuit can remain in that state for an extended period without causing a deep discharge of the battery. Choose Q1 for a minimal voltage drop (source to drain) at the required load current.



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