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fobos3
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Is there a way to deliver constant power to a varying load. Any ideas will be appreciated.
russ_watters said:Could you elaborate please - the question doesn't seem to make much sense.
fobos3 said:I've attached my idea.
U2 is a differential amplifier with gain 1. U1 is there to make sure the voltage at + and - is the same.
rbj said:the idea is good. i think R1 should be lower resistance and U2 gain be larger.
what do you plan to use for your analog multiplyer? you might want to look into something from Analog Devices, say the AD633 or AD734 or something like that. you can get some of them pretty cheap ($8) at Digi-Key.
you also want to have some pot in there to set and control the power.
fobos3 said:I was thinking with two log amplifiers then a summing amplifier and exponential amplifier.
[tex]e^{\ln a+\ln b}=ab[/tex]
With something like LM324(quad) which costs 10p(£0.10).
rbj said:you still need a logarithmic element (actually 3 of them). run-of-the-mill diodes don't follow the curve good enough. what do you plan to use for that?
fobos3 said:Transistors.
Here's my final schematics. I haven't calculated the values of the resistors so all are 10k.
Edit
Still need to figure out the gain for each op amp taking into account the offset voltage. In particular the log amplifiers.
Constant power to a varying load refers to a power supply or system that maintains a consistent output power level to a load that may change or vary over time.
Constant power to a varying load typically involves a feedback control mechanism that adjusts the power output to compensate for changes in the load. This can involve varying the voltage, current, or frequency of the power supply.
Using constant power to a varying load allows for more stable and reliable operation of electronic devices that may experience changes in their power requirements. It can also improve energy efficiency by only supplying the necessary amount of power to the load.
Constant power to a varying load is commonly used in electronic devices such as computers, smartphones, and other portable devices. It is also used in larger systems such as power grids and renewable energy sources.
While constant power to a varying load can provide stable and efficient power, it may not be suitable for all applications. Some systems may require a constant voltage or current instead of constant power, and in these cases, a different type of power supply may be needed.