0 Members and 1 Guest are viewing this topic.
Parantap Nandi asked the Naked Scientists: Please tell me if 9V D.C can be stepped up to 220V D.C directly without any other device (oscillator).Parantap NandiWhat do you think?
You can connect a 9 vdc battery to an R-C oscillator to produce an a/c sine wave of about 9 volts peak-to-peak. Connect that a/c to the primary coil of a 1:25 step-up transformer, and the secondary will be about 220 volts peak-to-peak or 155 vac. Put that thru a full-wave rectifier to get 220 vdc. Of course if you put too much of a load on the circuit, the a/c will no longer be a sine wave, and the output voltage will decrease. You can get higher voltages with the same transformer if you continually interrupted the current from a battery to the primary coil by rapidly switching the primary current on and off. Before we had transistors and solid-state relays, this was done by connecting a relay's output contacts in series with its own current. The d/c voltage output of the vibrating switch is a square wave, but the primary current is more like a trapezoidal wave. A transformer with a 1:10 ratio will increase the voltage of a sine-wave input ten fold. But the output voltage depends on the rate at which the input current rises and falls. You might get 1:100 voltage increase from a 1:10 transformer.
Many things are possible once you have an oscillator or some kind of switching but it is hard to devise a completely static way to do it , perhaps you could charge up a capaitor with a liquid dielectric and then let the liquid drain out or would that be cheating ?