High Voltage DC Supply

Project Title

High Voltage DC Supply

Project Area of Specialization Wearables and ImplantableProject Summary

HVDC power supplies are used in different industries for high voltage application  and it’s hardly available in market. HVDC is  producing greater than 30kV with power rating around 300W. This project is based on cock croft Walton voltage multiplier that converts AC electrical power from low voltage level to higher voltage DC level.  For the modification in earlier design we have used fly back driver circuit. Efforts have been made to get efficient design using  minimum number of stages. Output of Fly-back is 2.5KV. Further is the work of multiplier in which a specific number of stages are producing 30KV DC.  Ampere Rating of supply is 10mA .

Project Objectives

The aim of this project is to produce DC supply which can produce High voltage. The objective is to achieve up to 30 kV with low current requirement and power values using fly back driver circuits.  It is desired to construct small size, simple and low cost device. High voltage DC supply can be used in insulation test on cables and capacitors. To avoid large current flow in case of using AC for testing purposes. Project mainly deals with the two important fields of Electrical engineering namely Power and Electronics.

Project Implementation Method

In account of research:  we gone through some research papers consulting the importance and earlier work that has been done in this field.  In account of Simulations:  we have worked on different essential software, Proteus and PSpice. Simulations for Fly Back converter, IC 4093, and Multiplier Circuit have been done on Proteus 8.1 Software.  In account of hardware, we have worked on:  Stepdown Transformer.  Bridge Rectifiers.  Driver Circuit.  Fly-back Transformer.  Cock-Craft Walter voltage Multiplier.  Measurement Devices.  PWM Generation  PWM is being generated by analog circuit using 4093 IC.  High AC Generation Technique.  Fly-Back Transformer Generating High AC through pulsating DC by driver circuit.  Multiplier Circuit.  We have used seven   stages of voltage doubler containing diodes and capacitors in certain arrangement for voltage multiplication.  

Benefits of the Project

High Voltage Direct Current (HVDC) offers a range of technical, environmental and economic advantages over High Voltage Alternating Current (HVAC). Over long distances HVDC is a more attractive technology as it is more efficient and has lower electrical losses compared to AC. HVDC is the only viable technology for long distance subsea cable routes due to technical limitations of AC cable technology.  The inherent controllability of a HVDC line, due to fast and accurate power electronic control, is a major advantage of HVDC. With the ability to provide constant power as well as a range of other control functions, HVDC has become a very important technology in improving the stability, reliability and transmission capacity of power systems.  Demand for long distance transmission is increasing, as sources of renewable energy are generally located far from populous areas were electricity demand is high. All over the world, HVDC is enabling the connection of more renewable energy sources to the grid, replacing conventional power plants and leading to reductions in carbon emissions.

Technical Details of Final Deliverable

Step Down Center Tapped Transformer. At first, we have centered tapped step down transformer. Transformer is stepping 220V down to the require value of 30V. As it is center trapped transformer, there would be two outputs of 15 volts each.  One of the output voltage is going direct to Fly-Back Transformer after being rectified. The 2nd output of step down transformer is going to Driver Circuit after being rectified. Rectification. Both outputs of center trapped transformer are being rectified for changing AC into DC voltages. Voltage Regulation. Voltage is being regulated to operate 4093 IC at 12v.  Switching.  Fly-Back Transformer. Operation modes of Fly-back circuit include the discontinuous current, critical current and continuous current modes. These operation modes vary depending on the status of input voltage and output current. Fly-back transformer is here for jumping the DC voltage high to the value of 5KV.  Cock-Croft Walton Multiplier circuit. Multiplier Circuit is consist of 6 stages. It is multiplying the output coming from Fly-Back transformer. As there are 6 stages, it is multiplying 5KV output  six times and in result we are getting 30KV DC as our required output.    

Final Deliverable of the Project HW/SW integrated systemType of Industry Energy Technologies OthersSustainable Development Goals Industry, Innovation and Infrastructure, Responsible Consumption and ProductionRequired Resources

Item Name	Type	No. of Units	Per Unit Cost (in Rs)	Total (in Rs)
			Total in (Rs)	26540
Step Down Transformers	Equipment	1	5000	5000
Fly-Back Transformer	Equipment	1	6500	6500
Transistros	Equipment	10	30	300
Resistors	Equipment	40	15	600
Capacitors	Equipment	40	30	1200
Diodes	Equipment	40	15	600
IC 4093	Equipment	2	170	340
KV meter	Equipment	2	800	1600
PCB	Equipment	2	200	400
Wire Bundles	Equipment	4	100	400
Breaker	Equipment	2	150	300
Variable Knobs	Equipment	4	250	1000
Indication Lamp	Equipment	2	150	300
Documentation	Miscellaneous	2	1000	2000
Overheads	Miscellaneous	3	2000	6000