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參數(shù)資料
| 型號(hào)： | MR2504 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Medium-Current Silicon Rectifiers(中等電流整流器) |
| 中文描述： | 25 A, 400 V, SILICON, RECTIFIER DIODE |
| 封裝： | PLASTIC, 2 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 91K |
| 代理商： | MR2504 |
MR2502, MR2504, MR2510
http://onsemi.com
5
Figure 10. Rectification Waveform Efficiency
f, FREQUENCY (kHz)
2.0
1.0
60
20
10
6.0
70
3.0
5.0
100
8.0
,
40
7.0 10
20
30
50
T
J
= 25
°
C
CURRENT INPUT WAVEFORM
Figure 11. Single–Phase Half–Wave Rectifier Circuit
RECTIFICATION EFFICIENCY NOTE
R
S
R
L
V
O
The rectification efficiency factor
σ
shown in Figure 10
was calculated using the formula:
σ
P
(dc)
P
(rms)
V
2
o
(dc)
R
L
V
2
o
(rms)
R
L
.100%
V
2
o
(dc)
V
2
o
(
ac)
V
2
o
(dc)
.100%
(1)
For a sine wave input V
m
sin (
ω
t) to the diode, assume
lossless, the maximum theoretical efficiency factor
becomes:
σ
(sine)
V
2m
2
R
L
V
2m
4R
L
.100%
4
π
2
.100%
40.6%
(2)
For a square wave input of amplitude V
m
, the efficiency
factor becomes:
σ
(square)
V
2m
2
R
L
V
2m
R
L
.100%
50%
(3)
(A full wave circuit has twice these efficiencies)
As the frequency of the input signal is increased, the
reverse recovery time of the diode (Figure 9) becomes
significant, resulting in an increasing ac voltage component
across R
L
which is opposite in polarity to the forward
current, thereby reducing the value of the efficiency factor
σ
, as shown on Figure 10.
It should be emphasized that Figure 10 shows waveform
efficiency only; it does not provide a measure of diode
losses. Data was obtained by measuring the ac component of
V
O
with a true rms ac voltmeter and the dc component with
a dc voltmeter. The data was used in Equation 1 to obtain
points for Figure 10.
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