6.6KW OBC

Release time:

2023-05-24 10:52

PROJECT INTRODUCTION
The reference design is a 6.6kW OBC solution with input voltagerange 176-264Vac, rated output 240-420Vdc/16A. The input topologyis interleaved parallel PFC, DC/DC is full-bridge LLC, and the output isSiC diode bridge rectifier. For the short-circuit protection issue of LLCa more reliable two-level overcurrent protection is used to improvethe system reliability.
 
DESIGN SPECIFICATION
Input Voltage 176Vac~264Vac
Output Voltage 240~410Vdc
Rated Power 6600W
Switching Frequency 94% @full load
System Efficiency PFC:60KHz;LLC:80~300KHz

 

FEATURES

· Interleaved design, minimize EMl filter and output capacitor:

· Dualloop control, output CC & CV mode;

· SiC SBD rectifier, no trr issue and improve system efficiency:

· Full protection,including input UVLO, output OVP/OCP.

· Small volume:145mm*235mm*45mm, power density67W/incha3

 

MAIN TOPOLOGY

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MAIN DEVICES
 
Function Part Number Brand
Input Rectifier DSP45-12A IXYS
PFC MOS IXFH60N65X2 IXYS
PFC Diode C3D20060D Wolfspeed
MOSFET Driver IXDN604SIA IXYS
LLC MOS IXFH60N65X2 IXYS
LLc Diode C3D20060D IXYS

 

 MEASUREMENT RESULTS AND WAVEFORMS

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PFC working woveform, Vgs&Iin&Vds

 

 

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PFC MOSFET Vgs&Vds

 

 

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LLC fs<<fr

 

 

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LLC  fs==fr

 

 

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LLC fs>>fr

 

 

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Start up @no load, Vo&Io

 

 

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Start up @full loadVo&Io

 

 

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Dynamic: 25%load->100% load

 

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Dynamic: 0% load->100%load

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6.6KW OBC

2023-05-24