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參數(shù)資料
| 型號(hào)： | MR2940 |
| 廠商： | Shindengen Electric Manufacturing Company, Ltd. |
| 英文描述： | Provision for Standby mode operation Partial Resonance Power Supply IC Module |
| 中文描述： | 撥備待機(jī)模式操作局部共振電源IC模塊 |
| 文件頁(yè)數(shù)： | 15/19頁(yè) |
| 文件大?。?/td> | 226K |
| 代理商： | MR2940 |
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Shindengen Electric MFG.CO.,LTD
- 15 -
16
Primary coil size
(min)
f
on(max)
t
×
DC(min)
V
×
O
NP
η
×
3
α
P
D
2
A
×
×
×
×
=
[mm
2
]
17
Secondary coil size
(min)
f
q
off(max)
(t
O
(min)
f
q
NS
)
t
3
α
I
)
×
(t
D
×
1
2
A
×
×
×
×
=
[mm
2
]
A
NC
=0.2mm dia. is recommended for the N
C
coil for ease of calculation.
5.3 Main Transformer Design Examples
5.3.1 Initial Setup
Input voltage
Efficiency
AC90
～
276V
85%
V
O1
：
DC135V, 0.45A
V
O2
：
DC35V,0.40A
V
O3
：
DC16V,0.40A
Rated output
Total output
81.2W
Oscillation
frequency at droop
29.6kHz
Droop output
110.36W (rated output x 1.36)
Duty ratio
T
ON
/T=0.655
5.3.2 Primary Inductance (L
P
) Calculations
Ensure that t
on(max)
is
29
μ
s or less.
Droop output (rated total
output x 1.36) calculated
as P
L
5.3.3 Calculation of Number of Turns in Primary Coil (N
P
), and Gap (I
g
)
The maximum rating for
Δ
B for PC40 at 100
°
C is
390mT.
Δ
B has been derated to
310mT in this example.
The number of turns has
been rounded to the
nearest integer, however
this value may be
adjusted as necessary.
Primary inductance (L
P
) calculated using equations 1, 4, 9, and 10 in 5.2.2.
108
=
90
1.2
=
V
×
1.2
=
V
AC(min)
DC(min)
×
［
V
］
22.13
10
×
29.6
0.655
f
D
t
3
(min)
on(max)
=
=
=
［μ
s
］
3.67
0.655
×
108
×
0.85
110.36
×
2
D
V
×
η
P
2
I
DC(min)
L
CP
=
=
×
×
=
［
A
］
651.24
3.67
10
×
22.13
108
I
t
V
L
-6
CP
on(max)
DC(min)
P
=
×
=
×
=
［μ
H
］
Primary inductance L
P
=0.65mH.
The number of turns in the primary coil is calculated using equation 11 in 5.2.2.
Specifications require the use of PC40 EER39L steel in the transformer core.
Substitute A
e
=130mm
×
=
×
The gap (I
g
) is calculated using equation 12 in 5.2.2.
×
×
=
=
2
and
Δ
B=310mT in equation 11.
59
59.3
130
×
310
10
×
10
×
22.13
108
A
Δ
B
10
×
t
V
N
9
-6
e
9
on(max)
DC(min)
P
=
×
=
［
Turn
］
0.87
10
×
0.65
59
130
3
-
10
3.14
4
L
N
A
10
×
4
π
l
2
10
P
2
P
e
-10
g
=
×
×
×
×
［
mm
］
The number of turns in the primary coil is N
P
=59, and the gap I
g
=0.87mm.
The gap (I
g
) calculated above is a reference value.
During trial manufacture, adjust the gap (I
g
) in relation to the value found in the calculations,
and ensure that it is appropriate to the primary inductance value.
Substitute
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