AN1279-Addendum

OFFLINE UPS ADDENDUM TO AN1279
This addendum is to be used in conjunction with the Offline UPS Reference Design Application Note (AN1279). The
material covered in this addendum applies to the 110V version of the Offline UPS Reference Design.
Efficiency Graph
110V UPS Efficiency
90
Percent (%)
85
80
75
70
65
10
20
30
40
50
60
70
80
90
100
% Load
Hardware Changes
The following table calls out specific hardware changes made for the 110V Offline UPS Reference Design.
Designator
Value / Description
Manufacturer
Part Number
T1
Push-Pull Transformer (N = 4:32)
Custom Wound
C5, C7
Q7, Q8, Q9, Q10
Push-Pull Output Capacitors
(1500 µF, 250V)
Comments
The construction of the transformer,
bobbin, and core remained the same
EET-ED2E152EA
Inverter IGBT's (600V, 40A)
STGP19NC60WD
R87
9.10 kOhm 1/8W 1%
MCR10EZHF9101
R138, R158,
R162, R178
4.30 kOhm 1/8W 1%
MCR10EZHF4301 AC sense (ACI, ACO)
R137, R157
3.30 kOhm 1/8W 1%
MCR10EZHF3301 DC Bus sense (UDC)
© 2009 Microchip Technology Inc.
page 1
OFFLINE UPS ADDENDUM TO AN1279
Electrical Specifications
The following table provides the electrical specifications for the 110V version of the Offline UPS Reference Design.
Parameter
Description
Min
Typ
Max
Units
Comments
VIN
Input Voltage
99
110
121
V
fIN
Input Frequency
57
60
63
Hz
VOUT
Output Voltage
—
110
—
V
fOUT
Output Frequency
59
60
61
Hz
Battery Input Voltage
34
36
45
V
POUT
Continuous Output Power
—
—
1000
VA
OLP
Over Load Protection
>100
—
135
%
1350 VA (2 sec)
THD
Output Voltage THD
—
—
5
%
Full Load Resistive
System Efficiency Battery Charger
Mode
—
84
—
%
Inverter Mode System Efficiency
—
84
—
%
Mains to Inverter Transfer Time
—
—
12
ms
Inverter to Mains Transfer Time
—
0
—
ms
Battery Charge Current
—
2
2.5
A
Battery Input Current (Note 1)
—
—
40
A
Operating Temperature
—
25
—
°C
CF
Crest Factor
—
—
3:1
—
PF
Power Factor (Inductive Load)
.65
—
—
—
Power Factor (Rectifier Load)
.65
—
—
—
VBATTERY
η
tTRANSFER
ICHARGE
I_BATTERY
T
Note 1:
page 2
@100% Load
Only tested at .8 PF
UPS run time will vary with output load current and the discharge rate of the batteries. Refer to the battery
data sheet for specific discharge times.
© 2009 Microchip Technology Inc.
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