team 2 Electricivic

1. team 2Electricivic Benjamin Dannan Mark Snyder Matt Klutzke Mike Mitchell

2. OUTLINE • Definition of Failure and Reliability • Component Failure Analysis • Component Failure Rates • Questions

3. What is Failure? The termination of the ability…….. …of the product as a whole to perform its required function. …of any individual component to perform its required function. What is Reliability? …is the ability of a system or component to perform its required functions under stated conditions for a specific period of time.

4. Component Failure Analysis • FPGA failure • Undetermined state on an I/O pin • Current Sensor (LEM LTS25) • Fails to read current value properly • IGBT failure • The high and low leg of an IGBT pair both switch high

5. Section A: FPGA • FPGA failure would result in an undetermined state on an I/O pin • Cases of Undetermined State: • A pair of IGBTs could switch high • Send random data to master (dsPIC) • Not receive fail safes from master (dsPIC) • Ramp current continuously in one direction A

6. Section B: Current Sensor (LTS25) • Failure to Read Current properly • Would result in a failure of system to switch current properly • Current continuously ramps in one direction (positively or negatively) • Feedback not responding • => system will not achieve wanted current B

7. Section C: IGBTs • IGBT failure would result: • Direct short to ground would occur, causing IGBTs to blow up • Possible PCB damage C

8. Component Analysis Table

9. Failure Rates of Components Analyzed FPGA Failure Rate: λp = 2.52 e -8 failures/hour Current Sensor Failure Rate: λp = 2.47 e -7 failures/hour IGBT Failure Rate: λp = 1.98 e -7 failures/hour

10. Questions?