TRA2525 データシートの表示（PDF） - ON Semiconductor

部品番号

コンポーネント説明

メーカー

TRA2525

Medium-Current Silicon Rectifiers

ON Semiconductor 

TRA2525 MR3025

50

sine wave input

square wave input

TJ = 25°C

10

5

1

10

100

f, FREQUENCY (kHz)

Figure 10. Rectification Waveform Efficiency

RECTIFICATION EFFICIENCY NOTE

RS

RL

VO

Figure 11. Single Phase Half–Wave Rectifier Circuit

The rectification efficiency factor ∂ shown in Figure 10

was calculated using the formula:

ē

+

P(dc)

P(rms)

+

V2o(dc)

RL

V2o(rms)

.100%

+

V2o(dc)

V2o(ac) ) V2o(dc)

(1)

.100%

RL

For a sine wave input Vm sin(wt) to the diode, assume

lossless, the maximum theoretical efficiency factor

becomes:

V2m

ē(sine)

+

p2RL

V2m

.100%

+

4

π2

.100%

+

40.6%

(2)

4RL

For a square wave input of amplitude Vm, the efficiency

factor becomes:

V2m

ē(square)

+

2RL

V2m

.100%

+

50%

(3)

RL

(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.

http://onsemi.com

5

Share Link: