1.8KW high frequency and power density DC-DC converter

Release time:

2023-04-23 15:51

pic

 

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

pic

 

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

 

 MEASUREMENT RESULTS AND WAVEFORMS

pic

Efficiency vs.Io

 

pic

Working waveform @20% load

 

pic

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

 

pic

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

 

pic

10% load to 90% load

 

pic

90% load to 10% load

 

pic

Soft start @ no load

 

pic

Soft start @ full load

Download related files

File name
Release time
Download

1.8KW high frequency and power density DC-DC converter

2023-05-24