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DescriptionProject plan for the DCDC converter board
Target releaseMSXII
Epic
Document owner

Taiping Li

Project leadsTaiping Li


Team members


Goals

  • Provide a stable, reliable 12V supply to all of the LV systems

Background and strategic fit

The lithium-ion battery in the car is charged at a maximum voltage of 150 V. However, all of the LV system is designed to operate off of 12V. Two DC-DC converters will be used in parallel to reduce the load under normal conditions, and if a failure occurs, each DC-DC should be able to handle the entire LV system's load continuously. 

Requirements

#TitleUser StoryImportanceNotes
1Step down voltage from 151 V to 12 VFind an appropriate part
  • Input range for the DCDC converter is the range of voltages for the battery (108 - 151 V, 129.6 V nominal)
2

Supply the required current for the electrical components on the board

Find required part or use multiple converters to supply the proper current


  • Designed to supply ~ 20A continuously with no significant temperature rise (< 20 degrees C) 
3Provide redundancy for the circuit boardsPut parts into a configuration that allows for redundancy in case of failure
  • Parallel operation
4Add protection to converter inputAssure that the DCDC converter board is adequately protected from overvoltage, overcurrent, and reverse voltage
  • Input fusing according to manufacture specifications, and output fusing is done on Power Distribution
5Temperature SensingWe need a way to wire thermistors up to the DC-DC. The reference voltage and output signal is sent to Power Distribution where it will be sampled by the MCU's ADC
  • Through hole 10k NTC and taped to the DC-DC? Or we can also use a SMD thermistor near the DC-DC for convenience

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