UM2076
Demonstration
board overview
DocID029457 Rev 1
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The principal sections of the STEVAL-ISF003V1 board are:
1.
T1 and T2 silicon-controlled rectifiers (SCRs) in the mixed rectifier bridge.
2.
The MCU, which drives SCRs through opto-transistors (see APPENDIX 6) and can
also activate any supply or motor inverter referenced to the DC bus ground (GND_DC)
in a final application.
3.
The flyback power converter providing the sources in the table below.
Table 1: Power sources from flyback converter
Source
Output Ground
Destination
Maximum output
current
VCC_AC
5 V
GND_AC is
connected to the
HVDC bus
control SCRs (T1 and T2)
200 mA
5V_DC
+5 V
referenced to the
DC bus Ground
(GND_DC)
MCU and control circuits
90 mA
15V_DC
+15 V
referenced to the
DC bus Ground
(GND_DC)
can supply an IPM to control a
three-phase motor in a final
application
500 mA (together
with 5V_DC
consumption)
VCC_INS
+5 V
insulated output
for components which must be
insulated from the mains voltage,
(e.g., sensors). Not used on the
demoboard
90 mA
For further information regarding the SMPS outputs, please refer to
ISF003V1 power supplies and typical consumption"
1.3
Target applications
Target applications include all those using a diode-bridge to rectify the AC line voltage,
where NTC or PTC resistor removal and loss reduction in standby are desirable, such as:
EV chargers.
Telecom power supplies.
1.4
Main part numbers
The references of the main part-numbers used in this demoboard are:
Inrush-current-limiter SCRs: TN5050H-12WY
Rectifier diodes: STBR6012WY
Microcontroller unit (MCU): STM8S003F3
Flyback IC: VIPER26LD
1.5
Operating range
The STEVAL-ISF003V1 board is designed to operate inside following operating ranges:
RMS line voltage range:85 to 264 V
RMS
Line voltage frequency range: 45 to 65 Hz
Ambient temperature range is: 0 to 60 °C (heatsink fans keep junction temperature of
bridge components below T
j
max)
Maximum input current: 32 A
RMS
(7.4 kW input power for operation on 230 V
RMS
and
3.6 kW input power on 120 V
RMS
).
