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office
2 kW fully digital AC-DC power supply (D-SMPS) evaluation
board
Features
Input AC voltage: 90 V to 264 V
Output voltage: 48 V or 52 V, Max output
current: 42 A
Input AC frequency: 45 Hz to 65 Hz
Nominal output power: 2 kW
Interleaved PFC stage
PFC switching frequency: 60 kHz
PFC Average current mode control
Cycle by cycle PFC current control
Maximum power factor: 0.99
DC-DC stage: full-bridge phase-shifted ZVS
with synchronous rectification
DC-DC switching frequency: 100 kHz
Overall efficiency: 80 PLUS Platinum level
HF transformer isolation voltage: 4 kV
Forced cooling with air flow speed
modulation according to the output power
Over-temperature protection
Output short-circuit protection
PFC control & DC-DC control: managed by
STM32F334C8
PFC power stage based on MDmesh M2
Power MOSFETs and SiC Diodes
DC-DC power stage based on MDmesh
DM2 Power MOSFETs
Synchronous rectification based on
STripFET Power MOSFETs
Active clamp circuit based on MDmesh DM2
Power MOSFETs
EMC filter for noise reduction
RoHS compliant
Description
The STEVAL-ISA172V2 is a 2 kW fully digital
switch mode AC-DC converter consisting of two
power sections: a two phase interleaved power
factor corrector (PFC) and a DC-DC phase-
shifted full-bridge converter, controlled by a
STM32F334 microcontroller for each section.
The interleaved PFC comprises two boost
converters operating with 180° out of phase,
based on 600 V MDmesh M2 Power MOSFETs.
The downstream section comprises of a DC-DC
phase-shifted full-bridge converter based on
MDmesh DM2 Power MOSFETs and performing
voltage step down using HF transformer, with a
primary to secondary ratio chosen to maintain
high enough efficiency and regulation over the
entire operating range.
On the primary side the transformer is supplied
by the full-bridge converter and switching losses
are reduced thanks to zero voltage switching
(ZVS) operation.
On the secondary side synchronous rectification
(SR) is used to ensure low conduction losses.
The output voltage waveform is rectified by
STripFET Power MOSFETs and then smoothed
by the output filter.