Author Topic: Simple battery simulator  (Read 88 times)

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Online Rachie5272

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Simple battery simulator
« on: Yesterday at 08:56:42 pm »
I'm looking for a simple Li+ battery simulator, for testing charging circuits.  I don't need anything fancy, and don't even need to measure the output precisely.  I need more of a dummy battery, in order to keep the charger trying to charge.  Something which simulates a half-charged cell, and will simply dissipate any current sourced by the charger.

Does such a thing exist, or do I need to buy a full benchtop load/simulator?


Offline ResistorRob

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Re: Simple battery simulator
« Reply #1 on: Yesterday at 09:22:08 pm »
You can do this pretty easily with a DC power supply and a DC load with the outputs hooked together.   Set the power supply to your desired battery voltage, and set the DC load to constant V mode, a couple dozen millivolts above the output of the power supply.  When your circuit tries to charge the battery, the 'battery' voltage rises  a few mV, but not enough to trip OVP on the power supply and the load starts sinking current.

Online bdunham7

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Re: Simple battery simulator
« Reply #2 on: Yesterday at 09:27:34 pm »
Why not a 3.3 volt 5 watt zener diode in series with a 1 ohm 1 watt resistor?  That would be a 'good enough' simulation of a small cell with a max charge rate of about 1 amp.  Just parallel a few if you want to simulate a larger cell.
A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit DMM is good enough for most people.

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