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
文件頁數(shù)： 17/19頁
文件大小： 226K
代理商： MR2940
Shindengen Electric MFG.CO.,LTD
- 17 -
5.3.8 Calculation of Wire Size for Primary Coil (N
P
)
Adjust current density in
accordance with
conditions of use and
structure of the
transformer.
5.3.9 Calculation of Wire Size for Secondary Coils (N
S1
, N
S2
, N
S3
)
Coil size is calculated using the rated output power.
Cross-sectional area of the primary coil is calculated using equation 16 in 5.2.2.
With current density
（α）
set at 6A/mm
2
,
(min)
f
on(max)
t
DC(min)
V
×
O
NP
η
×
3
α
P
×
D
2
A
×
×
×
×
=
0.210
10
×
29.6
10
×
22.13
108
×
0.85
3
6
81.2
0.655
×
2
3
6
=
×
×
×
×
×
=
［
mm
2
］
A diameter of 0.50mm is therefore appropriate for the wire size of the primary coil.
Cross-sectional area of the secondary coil is calculated in the same manner as in 5.3.8 using equation 17 in 5.2.2.
toff(max) is first calculated using equation 5 in 5.2.2.
11.73
=
10
×
2.5
1)
+
(135
59
10
×
22.13
108
×
31
t
)
V
(V
N
t
V
×
N
t
6
-6
q
F1
O1
P
ON(max)
DC(min)
S1
off(max)
+
×
×
=
+
+
×
×
=
［μ
s
］
0.165
10
×
29.6
)
10
×
2.5
10
×
(11.73
3
6
0.45
)
10
×
29.6
10
(2.5
0.655
×
1
2
f
)
t
(t
3
α
I
)
×
f
(t
D
×
1
2
A
3
6
3
6
6
(min)
q
off(max)
O1
(min)
q
NS1
=
×
×
×
×
×
×
=
×
×
×
×
=
［
mm
2
］
0.146
10
×
29.6
)
10
×
2.5
10
×
(11.73
3
6
0.40
×
)
10
×
29.6
10
(2.5
0.655
×
1
2
f
)
t
(t
3
α
I
)
×
f
(t
D
×
1
2
A
3
6
3
6
6
(min)
q
off(max)
O2
(min)
q
NS2
=
×
×
×
×
×
=
×
×
×
×
=
［
mm
2
］
0.146
10
×
29.6
)
10
×
2.5
10
×
(11.73
3
6
0.40
)
10
×
29.6
10
(2.5
0.655
×
1
2
f
)
t
(t
3
α
I
)
×
f
(t
D
×
1
2
A
3
6
3
6
6
(min)
q
off(max)
O3
(min)
q
NS3
=
×
×
×
×
×
×
=
×
×
×
×
=
［
mm
2
］
The wire sizes for the secondary coils are therefore as follows.
N
S1
: 0.32mm dia. x 2 wires
N
S2
: 0.29mm dia. x 2 wires
N
S3
: 0.29mm dia. x 2 wires
The structure of the transformer requires that all turns in coil N
S1
be in a single layer.
Fig.5.1 Transformer Specifications and Coil Structure
1
6
5
3
2
N
P
1
N
P
2
N
C
N
S
1
N
P
1=37
［
Turn
］
0.50mm
φ
N
P
2=22
［
Turn
］
0.50mm
φ
N
S
2
12
10
7
11
N
C
=4
［
Turn
］
0.20mm
φ
N
S
3=4
［
Turn
］
0.30mm
φ×
2wires
NP2
N
P
1
N
S
2
N
S
1
N
C
Spacer
Spacer
N
S
3
8
N
S
3
N
S
1=31
［
Turn
］
0.30mm
φ×
2wires
N
S
2=8
［
Turn
］
0.30mm
φ×
2wires
Primary inductance (L
P
): 0.65mH (between transformer pins
①
and
③
)
Gap I
g
: 0.87mm
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