Constant power circuit

Hello All,

I am trying to determine if it is possible to develop a constant power load circuit using microcontrollers. Is it possible to use the PWM feature on a microcontroller to control the power being delivered from a battery load? The microcontroller would use two A/D converters one for voltage and another for the current and then calculate the power. The PWM output would adjust its duty cycle depending on if the calculated power is lower or higher than the set value. Is this possible? How are constant power loads normally made using digital and analog circuits? I have uploaded a circuit of what I am thinking.

Amir

One of the IC manufactures has an IC that communicates via I2c and will measure voltage, current and power.

An "Electronic Load" has modes of constant I, R, V and power. Usually you program a compliance. e.g. 1A current, voltage < 100V

KeepItSimpleStupid said:

One of the IC manufactures has an IC that communicates via I2c and will measure voltage, current and power.

An "Electronic Load" has modes of constant I, R, V and power. Usually you program a compliance. e.g. 1A current, voltage < 100V

Click to expand...

Hello KeepItSimpleStupid,

That sounds like a very useful IC. Do you know who manufactures such a part?

It took me about 15 minutes to find it:

https://www.linear.com/product/LTC2945

KeepItSimpleStupid said:

It took me about 15 minutes to find it:

https://www.linear.com/product/LTC2945

Click to expand...

Thanks KeepItSimpleStupid.

Amir