BiDirectional Automotive 4214 Volt Bus DCDC Converter

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Bi-Directional Automotive 42/14 Volt Bus DC/DC
Converter

• Arthur Pfaelzer Maurice Weiner Art Parker

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Objectives

• Introduce power conversion module
• Description of both modes of operation
• Resulting waveforms

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Modes of Control

• Buck mode control
• FETs Q1A (phase 1) and Q1B (phase 2)
• Series switches
• FETs Q2A and Q2B (phase 1/phase 2
  inverted)
• Synchronous rectifiers

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The power card module
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Converter Waveforms
42 Volt ripple 2?s/Div .1A/Div Vds buck
FETs 20V/Div Output current 12 A
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Converter Waveforms
14 Volt ripple 2?s/Div 20mA/Div Vds sync. rec.
FETs 20V/Div Output current 12 A
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Modes of Control

• Boost mode control
• Switches Q1A and Q1B
• Synchronous rectifiers
• Switches Q2A and Q2B
• Shunt switches

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The power card module
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Converter Waveforms
42 Volt ripple 2?s/Div .1A/Div Vds buck
FETs 20V/Div Output current 4 A
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Converter Waveforms
14 Volt ripple 2?s/Div 20mA/Div Vds buck
FETs 20V/Div Output current 4 A
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Converter Ratings

• Buck Mode
• Output power 284 Watts
• Efficiency 90
• Load regulation
• Ten to one range 0.07
• Boost Mode
• Output power 193 Watts
• Efficiency 86
• Load regulation
• Five to one range 0.2

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Extension to more modules

• Paralleled/interleaved converter
• Increase converter power
• Provide redundancy

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Future Investigations

• Fault protection
• Cooling
• Input and output conducted EMI
• Conducted susceptibility