My question is simple. I have one power supply which generate 28 volt. I would like to obtain -18V and 18V. I don't want to voltage divider with resistor. I generated 18 V to use regulator. But I couldn't generate negative voltage. Is there any component which does this conversion ? if yes there is, Can I simulate it in multisim ?
Thanks for your coorperation
Electronic – How to obtain negative voltage from positive voltage
converterdc/dc converterpower supply
Related Solutions
Here's a simple way to get regulated 120 volts, DC from 240 volt mains, but DANGER, WILL ROBINSON!!! it's not isolated from the mains, so if you get 240 hot and 240 neutral connected backwards it could seriously fry some equipment or make you dead.
If you want to play with the circuit, here's the LTspice .asc file you can use to run a simulation.
How about a simple inverting amplifier:
$$ Vout = - \frac{Rf}{Ri} Vin $$
simulate this circuit – Schematic created using CircuitLab
Ri at around 10Kohm can be a good starting value. Choose Rf to scale the output voltage such that it is always within the output voltage limit of the opamp and the input limit of the ADC.
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Best Answer
One way is to charge up a capacitor with the positive voltage, and then disconnect the charged capacitor and connect the + lead to the ground of the circuit. You'll now have a negative voltage (relative to circuit ground) at the - lead of the charge capacity.
Of course, in practice this is typically driven by an oscillator that does the charge/disconnect/reverse cycle frequently and then uses diodes to transfer the negative charge to a holding capacitor that keep the negative voltage present continuously.