Protection Electronics and Upgrades for
High Voltage Pulse Power Networks
Superadivisor: Dr. Jorge Rocca
Advisor: Mark Woolston
Senior Student: Xiang Sun
Outline

About PFN

Problem In PFN

Our Idea

Our Approach

Current Development

Future Development

Conclusion

Acknowledgement

Q&A
About PFN

PFN – Pulse Forming Network
Consist of series capacitors and inductors
electrical circuit accumulate energy with long time,
then release these energy in brief duration

PFN in Advanced Beam Laboratory
storing 2000 joules of energy & dumping 4000 A pulses
provide high pump laser power for laser amplification

Previous Work
Developed to 2nd Generation
Problem In PFN

Simmer Unit In PFN

Problem For Simmer Unit

Crisis
Cost, other equipment
, schedule & 20 PFNs
Our Idea

We proposed two way to solve this issue:

1. Reduce reverse recovery time
lower the possibility of electrical spike

2. Protection circuit to store high power energy
snubber which composed by RC circuit and
diode
Our Approach

1. Simulate on the software (LTspice)
Ltspice: simulator of electronic circuits
provide schematic capture
and waveform viewer
Goal: a. original performance of PFN
b. examine our idea
c. decide the proper component
Our Approach
c. decide the proper component and component value
Diode: Choose from 1N6517 1N6519 Z100SG Z50UFG
Performance Temperature
Decide 1N6517
Our Approach

2. Used the sample components to do the simulation on
PFN (Digital Storage Oscilloscope)
Sample protection module
Plastic shield used to avoid the potential
damage from high voltage capacitor
use digital storage oscilloscope
and high voltage probe to
measure the result
Our Approach

3. Combine the diodes and protection
circuit as a module on PCB (ExpressPCB)
limit inner space of PFN
hole size
extra high voltage wire
different connectors
Current Development

Assemble all components onto 20 PCBs

Modify PCB layout and change component

Install PCBs into 20 PFNs

Design metal bar to fix PCB into PFN (solid work)
Future Development

Design & produce plastic shield for protection module

Install metal bar, plastic shield, protection module into
PFN

Periodic test and modification

Design remote control module on PFN
Budget
Item
Quantities
Unit Price
Total Price
Diode
8*20+10
13.65
2320.5
Resistor
2*20+10
0.26
13
Capacitor
2*20+10
2.8336
141.68
PCB
1*20+10
--
734.5
Connector
3*20+40
--
115.1
Metal bar
20
4.33
86.6
Plastic Shield
20
5.06
101.2
Total = 3512.58
Conclusion


Challenge:

20 PFNs as the total, each units have little different

High power risk
what I learned:

Various software: Ltspice, ExpressPCB, SolidWork

Multiple Mechanical skills and Electronic product skill

Professional skills as Electrical Engineering
Acknowledgement

Thanks Dr. Jorge Rocca give me this opportunity

Thanks Mark Woolston instruct me on this project

Thanks Yong Wang, Shoujun Wang and Alex Rockwood
help me on my regular work
Question
Reference

Data sheet for Z50SG
http://www.voltagemultipliers.com/pdf/Z25SG-Z100SG.pdf

http://www.voltagemultipliers.com/pdf/1N6513_1N6515_1N6517_1N
6519.pdf

Mark Woolston. Fall Semester 2008. “Power Electronics for High
Power Lasers Pulse Power Systems for a Flashlamp Pumped Laser
Amplifier”.

http://www.cash-online.de/berater/2013/infinus-bafin/159227/print/
Thank You!