Voltage Multipliers - Half Wave Voltage Doubler Circuit

in this video we're gonna talk about voltage multipliers a circuit that can increase the voltage of the input by some multiple so in this example what we have is a half wave of voltage doubler we have an AC signal at the input and we're gonna get a DC signal at the output we have two capacitors which we'll call c1 and c2 and we have two diodes d1 and d2 and the resistor is the load of resistor now let's talk about how this circuit works this circuit can increase the voltage so let's say the voltage of the input is 10 the voltage of the output if you don't take into account the voltage drop of the diodes will be approximately 20 volts however there's a trade off this circuit doesn't increase the energy of the system if you so at a hundred percent efficiency let's say the current was 10 amps the maximum current that you can get at the output will be 5 amps such that the power transferred is a hundred watts power is voltage times current so whenever a circuit increases the voltage without applying any input energy to the circuit the current is going to decrease because we don't have any external power sources that's going to increase the voltage the voltage is being increased by passive elements not by any active element so as the voltage goes up the current goes down now let's talk about how the circuit increases the voltage and to do that let's briefly review batteries let's say if we have two batteries connected in series let's say the first one is a 10 volt battery and the second one is a 25 volt battery what is the output voltage across those two batteries and now what's going to happen if we switch the polarity of the 10 volt battery what will be the output now so feel free to pause the video and think about that for a moment whenever you connect the negative terminal of one battery to the positive terminal of the other battery the voltages add up