STEVAL-ISA147V3 Datasheet, PDF (1/10 Pages) STMicroelectronics – Semi-Bridgeless PFC stage

STEVAL-ISA147V3
500 W fully digital AC-DC power supply (D-SMPS) based on
STM32F334C8 microcontroller
Data brief
Features
 Input AC voltage: 90 V to 264 V
 Input AC frequency: 45 Hz to 65 Hz
 Nominal power: 500 W
 Output voltage: 12 V
 Semi-Bridgeless PFC stage
 DC-DC stage: resonant LLC with
synchronous rectification
 Peak efficiency: 94%
 PFC switching frequency: 60 kHz
 DC-DC switching frequency: 80 kHz to 115
kHz (burst mode above)
 HF transformer isolation voltage: 4 kV
 Cooling: natural convection up to 300 W,
forced cooling above 300 W
 PFC control: managed by STM32F051K8
 LLC control: managed by STM32F334C8
 Input short-circuit protection
 Input under/overvoltage protection
 Input under/overfrequency protection
 DC Bus under/overvoltage protection
 Output short-circuit protection
 Output under/overvoltage protection
 Overtemperature protection
 RoHS compliant
Description
The STEVAL-ISA147V3 is a digital switch mode
AC-DC converter consisting of two power stages:
an input semi-bridgeless power factor corrector
(SBPFC) controlled by an STM32F051K8, and a
regulation stage implemented with an LLC half
bridge with synchronous rectification (SR),
controlled by an STM32F334C8 microcontroller.
This 500 W AC-DC converter uses the so-called
bridgeless PFC topology, with the advantage of
lower conduction losses and higher efficiency by
eliminating the need for a diode rectifier stage.
This choice also allows a reduced component
count compared to a standard PFC.
The input stage is typically controlled using an
outer voltage loop for bus voltage regulation and
an inner control loop to shape the current
according to a sinusoidal waveform. The outer
loop adjusts the current reference in order to
maintain a regulated bus voltage, independent of
load or input voltage variations. The output
isolation and regulation stage is implemented
using a half-bridge LLC topology, operating with
constant duty cycle and variable frequency
control.
March 2016
DocID029092 Rev 1
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