Hi all,
New to the forum, and rusty in circuit design. I'm tasked with adding a backup battery and switchover circuit to a system that currently runs off 3 D-cell alkalines.
1. The circuit needs to be modified to run off the main 3-Dcell pack until voltage drains to below 4V.
2. At this point it needs to switch to the secondary 3-AA cell pack until drained.
3. The current system draws only 5mA to a max of 150 mA, and is required to run for several months of constant sampling. This means my new circuit must be a very small additional load.
4. The circuit must "seamlessly" switch batteries.
I've attempted using a TPS2112 for this, and can supply the schematic if needed, but this seems to be an un-ideal candidate. Firstly, I don't want the batteries oscillating back and forth. Secondly, the circuit does not seem to switch seamlessly enough. The voltage drop upon switch seems to cause the system to glitch. I'm hoping for any assistance/advice or best yet a diagram.
New to the forum, and rusty in circuit design. I'm tasked with adding a backup battery and switchover circuit to a system that currently runs off 3 D-cell alkalines.
1. The circuit needs to be modified to run off the main 3-Dcell pack until voltage drains to below 4V.
2. At this point it needs to switch to the secondary 3-AA cell pack until drained.
3. The current system draws only 5mA to a max of 150 mA, and is required to run for several months of constant sampling. This means my new circuit must be a very small additional load.
4. The circuit must "seamlessly" switch batteries.
I've attempted using a TPS2112 for this, and can supply the schematic if needed, but this seems to be an un-ideal candidate. Firstly, I don't want the batteries oscillating back and forth. Secondly, the circuit does not seem to switch seamlessly enough. The voltage drop upon switch seems to cause the system to glitch. I'm hoping for any assistance/advice or best yet a diagram.