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

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Presentation transcript:

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

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

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.

Block diagram

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)

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 + - _

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

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.