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UM0527 Datasheet(PDF) 22 Page - STMicroelectronics

Part # UM0527
Description  UPS evaluation board
PDF  66 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0527 Datasheet(HTML) 22 Page - STMicroelectronics

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General description
UM0527
22/66
Referring to Figure 10, the measurements are defined as follows:
a)
Output current. Input voltage measurement unit is built as a differential amplifier
with a 2.5 V offset (LM324). The output signal from the amplifier is connected to
the A/D converter in the microcontroller.
b)
Battery voltage. The input voltage phase unit works as a comparator (LM324) and
contains information about the sign of the input voltage waveform.
c)
Inverter output voltage. Output current unit is built as a differential amplifier with
2.5 V offset (LM324). The output signal from the amplifier is connected to the A/D
converter in the microcontroller.
d)
Input voltage. The inverter output voltage is monitored through the voltage divider
and connected to the microcontroller A/D converter input.
e)
Input voltage phase. The battery voltage measurement uses a resistive voltage
divider and the next A/D converter input of the microcontroller.
1.1.13
Battery overcurrent protection
Figure 11.
Battery overcurrent protection
The battery overcurrent protection is given by a fuse.
1.1.14
Mains protection
The mains is protected by an automatic fuse mounted in an enclosure. If tripping occurs, the
fuse can be reset by the UPS user.
1.1.15
UPS modes
F2
3,15A 250V
VAKK
VBAT
GND
1
J12
1
J16
VAKK
VBAT
GND
Table 4.
UPS modes
Mains
mode
Boost
mode
Buck
mode
Inverter
mode
Standby
mode
Standby
charge
mode
OFF
mode
UPS input
On
On
On
Off
Off
On
Off
UPS output
On/off
On/off
On/off
On
Off
Off
Off
Battery charger
On
On
On
Off(1)
Off
On
Off
Inverter
Off
Off
Off
On
Off
Off
Off



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