Power Mosfets
2008
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Power Mosfets
Tips And Tricks For 12 Volt Power Supply
12 Volt Power Supply
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How to increase current (amps) in circuit without decreasing voltage?
I have a circuit running at about 5.02 volts under load, but it's only drawing less than 100mA. I need it to draw at least 100mA, possibly up to 200. The power is being generated by a DC motor. Is there any way I can increase this current without dropping the voltage under 5v?
I've heard uses of transistors or mosfets to do such a thing, but the only way I can think of is adding a battery to one to add current. I'm not sure on the exact implementation, however.
If all else fails, I can try better wire. How would I go about adding a battery into the circuit? Could I just put it inline with the generator?
First off decreasing the Voltage will not increase the current as your question implys. If lowering the load resistance which increases the load current causes a drop in source Voltage then you are probably overloading the dc generator.
If the load resistance is fixed then the only way you can increase the load current is to raise the source Voltage. If the load resistance can be lowered then the load current will increase proportionally if the 5.02 Volts can be maintained.
The current capabilities of Voltage sources in series is limited to the current capabilities of the Voltage source in the series with the lowest current capabilities so you will not gain any current capacity by adding a Voltage source in series with what you now have if current capacity is what your problem is. If low Voltage magnitude is your only problem then adding a Voltage source in series would eliminate the problem but I would not recommend that as a permanent fix.
I think you need to do as Bilrus recommended and get a single dc power supply with the Volt Amp capacity to furnish at least 200 mA at the Voltage required to produce 200 mA through the load that you have. If the load is drawing less than 100 mA at 5.02 Volts then you need a power supply with a Voltage output in the neighborhood of 10 or 12 Volts to produce 200mA of current through the existing load.
I think you are wasting time replacing the wiring to try to increase the circuit`s current unless the wiring is extremely small in diameter or extremely long in length.
Asymmetric MOSFET Saves Space/Increases Power Density (Vishay Product Demo)
