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参数资料
| 型号： | MR3025G |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 整流器 |
| 英文描述： | 25 A, 250 V, SILICON, RECTIFIER DIODE |
| 封装： | MICRODE BUTTON, 2 PIN |
| 文件页数： | 5/7页 |
| 文件大小： | 104K |
| 代理商： | MR3025G |
TRA2525, MR3025
http://onsemi.com
609
Figure 10. Rectification Waveform Efficiency
f, FREQUENCY (kHz)
100
1
5
10
50
,EFFICIENCY
F
ACT
OR
(%)
10
square wave input
sine wave input
TJ = 25°C
Figure 11. Single Phase HalfWave Rectifier Circuit
RS
RL
VO
RECTIFICATION EFFICIENCY NOTE
The rectification efficiency factor
shown in Figure 10
was calculated using the formula:
+
P(dc)
P(rms)
+
V2o(dc)
R
L
V2o(rms)
RL
.100%
+
V2o(dc)
V2o(ac)
) V2o(dc)
.100%
(1)
For a sine wave input Vm sin(wt) to the diode, assume
lossless, the maximum theoretical efficiency factor
becomes:
(sine) +
V2m
p2RL
V2m
4RL
.100% + 4
π2
.100%
+ 40.6%
(2)
For a square wave input of amplitude Vm, the efficiency
factor becomes:
(square) +
V2m
2RL
V2m
RL
.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 increase ac voltage component
across RL which is opposite in polarity to the forward
current, thereby reducing the value of the efficiency factor
, 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
VO 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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