Solution

1.8KW high frequency and power density DC-DC converter

Release time:

2023-04-23 15:51

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PROJECT INTRODUCTION
The reference design is a high frequency 1.8kW DC/DC converterbased on SiC device with input voltage range 300-400Vdc, ratedoutput 12V/50A. Synchronous LLC topology and main controllerFAN7688 used selected, with peak current control, cycle-by-cyclecurrent limit, and output OvP & short circuit protections. Powerdensity reaches 190W/inch^3。
 
DESIGN SPECIFICATION
Input Voltage 3oovdc-420Vdc
Output Voltage 12Vdc
Rated Power 18Oow
Switching frequency 120~40OKHz
System Efficiency 97.14%@25%load: 93.4%afull load

 

FEATURES

· High frequency, small size, power density is 190W/inch^3；

· Peak current control mode, cycle-by-cycle current limit;

· No electrolytic capacitor, longer life and higher reliability:

· Full protection,including input OVP & UVP, output OVP & OCP, short circuit protection

 

MAIN TOPOLOGY

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MAIN DEVICES
 
Function Part Number Brand
Primary MOS C3MOO650903 Wolfspeed
Secondary MOSFET Driver IXDN6o9SIA 力特

 

 MEASUREMENT RESULTS AND WAVEFORMS

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Efficiency vs.Io

 

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Working waveform @20% load

 

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Working waveform @full load, Pri Vgs&Sec Vgs&Ipri&Sec Vds

 

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Working waveform, Pri Vgs&Sec Vgs &Ipri&Pri Vds

 

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10% load to 90% load

 

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90% load to 10% load

 

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Soft start @ no load

 

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Soft start @ full load

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1.8KW high frequency and power density DC-DC converter

2023-05-24