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#TitleUser StoryImportanceNotes
1Voltage IsolationHigh voltages must be isolated from the 12V rail of the vehicle, so in case of a failure in the resistors, HV will not go into the 12V railMust Have
  • Looking into Optoisolators or Digital Isolators with a isolated power supply
2    Reliable Operation Must reliably initiate pre-charge and discharge when powered on and powered offMust Have  


Questions

Below is a list of questions to be addressed as a result of this requirements document:

Part NumberDescriptionLinkPurposeLM311MNS/NOPB-NDComparator General Purpose DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL 8-SOIChttp://www.digikey.ca/product-detail/en/texas-instruments/LM311M-NOPB/LM311MNS-NOPB-ND/32589P470KBYCT-NDRES SMD 470K OHM 1% 1/4W 0603http://www.digikey.ca/product-detail/en/panasonic-electronic-components/ERJ-PA3F4703V/P470KBYCT-ND/5036197Voltage Divider R1P33KBYCT-NDRES SMD 33K OHM 1% 1/4W 0603http://www.digikey.ca/product-detail/en/panasonic-electronic-components/ERJ-PA3F3302V/P33KBYCT-ND/5036176Voltage Divider R2PB1248CT-NDTelecom Relay SPST-NO (1 Form A) Surface Mounthttp://www.digikey.ca/product-detail/en/te-connectivity-potter-brumfield-relays/1462041-3/PB1248CT-ND/2126954Pre-ChargePB1250CT-NDTelecom Relay SPDT (1 Form C) Surface Mounthttp://www.digikey.ca/product-detail/en/te-connectivity-potter-brumfield-relays/1462042-9/PB1250CT-ND/2126956DisCharge945-1209-NDIsolated Module DC DC Converter 1 Output 12V 21mA 10.8V - 13.2V Inputhttp://www.digikey.ca/product-detail/en/recom-power/RM-1212S/945-1209-ND/2256389DCDC1080-1201-1-NDLogic Output Optoisolator 1MHz Open Collector 5000Vrms 1 Channel 6-SMD

http://www.digikey.ca/product-search/en?keywords=1080-1201-1-ND

Voltage Isolation497-15521-1-NDMOSFET P-CH 30V 4A SOT23-6http://www.digikey.ca/product-detail/en/stmicroelectronics/STT4P3LLH6/497-15521-1-ND/5244878Main RelayBSS138-FDICT-NDMOSFET N-CH 50V 200MA SOT23-3http://www.digikey.ca/product-detail/en/diodes-incorporated/BSS138-7-F/BSS138-FDICT-ND/7178432* for Pre-Charge Relay & DCDC296-14106-1-NDS-R Latch 4 Channel 1:1 IC Tri-State 16-TSSOPhttp://www.digikey.ca/product-detail/en/texas-instruments/CD4043BPWR/296-14106-1-ND/525904Latch OutputWM2282CT-ND4 Position Receptacle Connector 0.079" (2.00mm) Surface Mount, Right Angle Tinhttp://www.digikey.ca/product-detail/en/molex-llc/5024940470/WM2282CT-ND/2380440HV & Power to BoardWM2274-ND4 Position Rectangular Housing Connector Plug White 0.079" (2.00mm)http://www.digikey.ca/product-detail/en/molex-llc/5024390400/WM2274-ND/2380424WM3978CT-NDContact Crimp Non-Gendered 22-26 AWG Tinhttp://www.digikey.ca/product-detail/en/molex-llc/5024380000/WM3978CT-ND/2421937WM9812CT-ND2 Position Receptacle Connector 0.059" (1.50mm) Surface Mount, Right Angle Tinhttp://www.digikey.ca/product-detail/en/molex-llc/5025850270/WM9812CT-ND/4176661To Main RelayWM11189-ND2 Position Rectangular Housing Connector Plug Beige 0.059" (1.50mm)http://www.digikey.ca/product-detail/en/molex-llc/5025780200/WM11189-ND/2818998311-15KGRCT-NDRES SMD 15K OHM 5% 1/10W 0603http://www.digikey.ca/product-detail/en/yageo/RC0603JR-0715KL/311-15KGRCT-ND/7296642* Pull up Resistor490-10731-1-ND2.2µF ±10% 25V Ceramic Capacitor X5R 0603 (1608 Metric)http://www.digikey.ca/product-detail/en/murata-electronics-north-america/GRM188R61E225KA12D/490-10731-1-ND/5251369RC delay for DCDC_IN

987-1016-1-ND

20k Ohm 0.25W, 1/4W Gull Wing Surface Mount Trimmer Potentiometer Cermet 1 Turn Top Adjustmenthttp://www.digikey.ca/product-detail/en/tt-electronics-bi/23BR20KLFTR/987-1016-1-ND/2409027Adjustment for voltage divider
QuestionOutcome
Minimum differential voltage before the main relay can close< 0.7V should be enough to prevent any arcing
P-ch MOSFET goes to DCDC and Pre-charge relay, with RC circuit going to Pre-charge relay for >5ms. What voltage does DCDC need? Add another N-ch MOSFET for higher current?

Proposed Parts 

12VDC for DCDC, Use Additional mosfet and RC circuit for time delay.

Proposed Parts 


Changes:

  • Look at Chaos MOSFETS 
  • Change to N channel mosfets, standardize 

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