this shows how to generate High Voltage Dc from low input Ac a complex circuit may comprise of 8 stage Voltage Multiplier followed by a Voltage Doubler Circuit

1. HIGH VOLTAGE DC UPTO 3KV FROM AC
BY USING DIODE AND CAPACITORS IN
LADDER NETWORK
Submitted by:

2. Contents
 Project overview
 Block diagram
 Capacitor
 Diode
 Schematic & working of project
 Applications
 Advantages
 Future scope
 Conclusion

3. Project overview
 This project describes the design and
implementations from a single phase ac to high
voltage DC power supply till 10kVoutput.
 The implementation of the hardware work to
build a high voltage DC power supply is meant
for use in the laboratory.
 The designed DC power supply can be used in
industrial applications also.
 The design of the circuit involves voltage doubler,
whose principle is to double the output voltage.
 The output from the voltage doubler is given to a
series of cascaded circuit that generates up to
10KV but for the student project it is advisable to
go up to 2KV for safety reasons.

4. Block diagram

5. Capacitor
 A basic capacitor has
two parallel plates
separated by an
insulating material
 A capacitor stores an
electrical charge
between the two plates
 The unit of capacitance
is Farads (F)

6. Storing a charge between the plates
 Electrons on the left plate
are attracted toward the
positive terminal of the
voltage source
 This leaves an excess of
positively charged holes
 The electrons are pushed
toward the right plate
 Excess electrons leave a
negative charge
+ -
+
_

7. Diode
 Simplest semiconductor device
 Non linear
 Used in power supplies
 Voltage limiting circuits

8. Working of project
 This project uses voltage multiplier circuit in multistage
using a no of silicon diodes (D1-D8) and a set of
electrolytic capacitors of 2 no’s of 100mf/400V connected
in series.
 Thus 16 capacitor of 100mf/400V are used for 8 stage
voltage multiplication.
 Thus if the input is 230v rms the output will be
approximately [sqrt 2 x 230 x 8 = appx 2.5kv].
 In order to measure this voltage a potential divider
arrangement comprising of 10resistors in series is made
such that the voltage across 1 resistor is 2.5/10=250V,
Which can be easily read by any standard meter to indicate
that the full voltage is approximately 2.5kV.
 500k resistors are connected across each pair of capacitors
to discharge them automatically after use, it will prevent
from high voltage electric shock.