1. EPNES Meeting
February 4, 2003

2. PSpice Simulation of Series and Parallel Switches
Simulation Objectives
Create M x N matrix of switches and transient protection circuits
Evaluate and test different methods of interconnecting the parallel strings
Design switch and snubber circuits
Load modeling
Construct a robust system to simulate errors in component values and asynchronous switching
Build hierarchical blocks to provide easy manipulation of switches

3. M x N switch matrix with RCD voltage snubbers
Connection Methods
M x N switch matrix with RCD voltage snubbers

4. Connection Methods
Isolated String Cross Bridge

5. Switch and Snubber Design
Switching specifications:
On-State Resistance: .4 ohms
Off-State Resistance: Meg- ohms
Operating Voltage: 1.9v
Release Voltage: .7V
Turn-on Time: 1ms
Turn-off Time: .2ms

6. Switch and Snubber Design
Turn-off Snubber Turn-on Snubber

7. Load Modeling Load Specifications: Method 1: Method 2: RL load
400 Vdc supply
10,000 watt load
Method 1:
Assume RL load with a power factor of 86% lagging.
Method 2:
Construct a 10kW constant-power steady-state load
RL load

8. Constant-Power Load

9. Hierarchical Block Construction

10. Hierarchical Block Construction

11. Hierarchical Block Construction

12. Hierarchical Block Construction

13. Hierarchical Block Construction

14. Hierarchical Block Construction

15. 4x64 Switch Cross Bridge Simulation: Synchronized switching

16. 4x64 Switch Cross Bridge Simulation: Asynchronized switching

17. 4x64 Switch Cross Bridge Simulation: Asynchronized switching Parallel Switch Currents

18. 4x64 Switch Isolated String Simulation: Synchronized switching

19. 4x64 Switch Isolated String Simulation: Asynchronized switching

20. Future Goals
Verify simulated systems (on a smaller scale) with actual experimental data
Source impedance modeling
Finalize load model
Analysis of system during switch failure
Analytical model of system behavior

21. References
H. A. C. Tilmans, E. Fullin, H. Ziad, “A fully-packaged electro-magnetic microrelay,”
N. Mohan, T. Undeland, W. Robbins, Power Electronics, John Wiley and Sons, New York, 1995.