How to discharge a battery onto a load with constant voltage/current while battery output voltage decreases.

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cathal mcsweeney 2022-3-20

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评论： SALAH alatai 2022-8-10

Hi, I am looking for a solution to discharge a battery. I want the battery to be constantly applying 300w to a load, even as the battery discharges and is reducing its output voltage. Would a buck dc-dc converter give a constant voltage/ current output?

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回答（1 个）

Xiangchun 2022-7-18

Hi Cathal,

To maintain a constant discharge power from the battery, it would be necessary to increase discharge current progressively as voltage decreases during discharge. A closed-loop feedback control would be needed to adjust the current for maintaining a constant power.

Best wishes,

Xiangchun

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Xiangchun 2022-8-9

@SALAH alatai.

Hi Salah, here is an example which contains a closed-loop feedback control to maintain a constant voltage by changing the charge current. It can be easily modified to maintain a constant power (i.e. current times voltage).

Smartphone Battery Charging - MATLAB & Simulink (mathworks.com)

Best,

Xiangchun

SALAH alatai 2022-8-10

@Xiangchun thanks for the response. This model has been built by the foundation library (blue lines) and I am working with a specialized library (black lines), much different even the battery and the powergiu block.

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