2.6  Voltage - Multiplier

2.6.1  How it works

For a voltage multiplier the input voltage must be alternating. The output will be a direct voltage.

 

 

Figure 2.6: Smoothing circuit

 

The multiplier uses the effect, that basically a capacitor is conductive for ac and nonconductive for dc and that a diode is only conductive, when the voltage potential at the anode is higher than at the cathode. Figure 2.6 shows a simple smoothing circuit. When V1 is turned on, the capacitor C1 will be charged with the negative half wave to 100V through D1. So the voltage at the junction between D1 and C1 is UV1 + 100V. Figure 2.7 shows the simulated voltages. V(C1:1) is the voltage level of C1 on the left side, V(C1:2) is the voltage level on the right side.

 

Figure 2.7: Smoothing circuit, loading of C1

 
 

Figure 2.8: Voltage multiplier, one stage, schematic

 

In Figure 2.8 another rectifying / smoothing circuit is added to the circuit of Figure 2.6: The voltage level at D1 is rectified. The result is shown in Figure 2.9: C2 is charged to a voltage level of about 2 · vampl.

 

Figure 2.9: One stage voltage multiplier, simulation data, start

 

 

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