How to limit DC current without affecting Voltage?

I would like to be able to choke current example 12-20amps from the 40amp peak to peak keeping voltage level to rise when the current begins to fall again as stabling after a huge load peak. This will preserve energy consumption on my circuit.

Things ive researched

Transformer choke
Current limit thorough chips
add a pwm and control (expensive and time consuming)

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ArturoC6 (author) 2 years ago

Well i have a motor that pulls a constant amperage and runs at 12v. The motor goes up and down in rpm dependent on load. Since a drop in rpm will not hurt the system. Id like to have a way to control current to not overheat the dc motors. Does having a h bridge with pwm help control heat i was thinking with a arduino.

You're trying to beat physics, and you can't. A DC motor draws a variable current depending on its load, to draw that current, the RPM changes.

+1 Fixing the current will just cause the motor to drop more RPM under load - or to look at it another way it will limit the output of the motor.

As I said originally you need to be MUCH more specific in your project requirements to allow us to asses what you can or an not do.

I think you did not understand the basics of electrics.
And I don't even try to explain things as there is not enough from your end to go with.

iceng2 years ago

It seems you do not have experience with DC power supplies.

If you have a [stiff = low impedance] DC power supply then it makes no difference if the current is full-flow, half-flow or not-flowing and the voltage will be constant = the same.

To adjust the current flow you will need a power mosfet and the electronics to control it. Weather you go analog or PWM depends on over 3 semesters of education and the load requirements you have not even mentioned.

rickharris2 years ago

Yet again we need to know a lot more about what your trying to achieve.

will give you a constant current.

In general a circuit will draw the current it need to operate - or as much as it can depending on the type of circuit.

Power is a product of current and voltage - I x V=W

For a given voltage you will use a given wattage if the current if fixed. however your circuit may not operate as you think if you limit the current. (depends on what it is)