11KW BI-DIRECTIONAL OBC

Release time:

2023-05-24 11:02

PROJECT INTRODUCTION
This reference design is a 6.6kW bi-directional OBC base on full SiCdevices design, with single-phase & three-phase compatible AC input.and maximum output power is 6.6KW for single-phase input and11KW for three-phase input. PFC and LLC are each controlled by oneDSP respectively. PFC bus voltage can be regulated in real timeaccording to the output voltage, which optimizes LLC operation andimprove system efficiency. While in reverse operation, the invertoutput is maximum 6.6KW single-phase 220Vac.
 
DESIGN SPECIFICATION
Input Voltage 380Vac/220Vac
Output Voltage 240~500Vdc
Rated Power 11KW/6.6KW
System Efficiency Peak 96%
PF PF >0.99
Switching Frequency PFC:45KHz;LLC:80KHz~300KHz

 

FEATURES

· Full SiC design, lower switching loss, higher efficiency, peak up to 96%:

· Bi-directional design, charge forward or invert single-phase AC output:

· Compatible with 6.6KW single-phase input and 11kW three-phase input;

· Digital control, completely eliminate the zero-crossing distortion of totempole PFC:

· Two DSP controller design, PFC BUS can be regulated in real time tooptimize the system efficiency according to the output voltage.

· CAN communication;

· Full protection, including input OVP/UVP/OCP, BUS OVP, output OVP/UVPOCP, and short circuit protection:

 

MAIN TOPOLOGY

pic

 

MAIN DEVICES
 
Function Part Number Brand
PFC MOS C3M0065120K Wolfspeed
LLC Primary MoS C3M0065120K Wolfspeed
LLC Secondary MOS C3M0032120K Wolfspeed
Current Sensor MCA1101-50-5 Aceinna

 

 MEASUREMENT RESULTS AND WAVEFORMS

picEfficiency curve @230Vac single phase input

picEfficiency curve @380Vac three phas e input

 

 

picInvert output efficiency curve under different battery voltage

picPF value @ three phase 380Vac input

 

 

picTHD @ three phase 380Vac input

pic11KW 3 phase input

 

 

pic6.6kW single phase input

picLLCVgs&Vds&Ipri

 

 

picLLC Ipri&Isec Vgs Pri& Vgs Sec

picReverse invert output voltage & current

 

 

 Simulation waveform

picThree phase PFC simulation: 3 phase voltage & current waveform

picTotem-pole PFC simulation: current & voltage waveform @ full load

 

 

picLLC simulation: 700Vin, 500Vout fs=fr

picLLC simulation: 400Vin, 240Vout @ full load, 115KHz

 

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11KW bi-directional OBC

2023-05-24