Electronic Load - Constant Voltage

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02:30:53

Close the switch to start. Tweak the feedback resistors to get a different voltage drop.

A Constant Voltage Electronic Load is a test equipment that is used to test constant current sources, such as battery charger circuits and the CC function of a bench PSU. It senses the voltage at the input terminals and compares it against a reference and adjusts the resistance of the MOSFET in such a way that the voltage drop across it remains constant irrespective of the current draw.  

The value of constant voltage is given by
     
                 Vconst = Vref*(1+R2/R1)

Putting Vref = 2.5V, R2 = 10k, R1 = 20k, we get Vconst = 3.75V, which is the nominal voltage of a lithium ion battery.

Constant Current Type: http://everycircuit.com/circuit/4538767357247488

Constant Resistance Type: http://everycircuit.com/circuit/5400474459832320

published 4 years ago

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