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| 型號： | AN5374S |
| 英文描述： | Consumer IC |
| 中文描述： | 消費性IC |
| 文件頁數(shù)： | 2/5頁 |
| 文件大?。?/td> | 82K |
| 代理商： | AN5374S |
www.dynexsemi.com
AN5370 Application Note
2/5
Reverse voltage
R
V
(AB) min
I
max
Spread of
avalanche voltages
Spread of
leakage currents
I
max
= Maximum reverse current in a series string
V
(AB) min
= Minimum avalanche voltage
Fig.3 Spread of reverse characteristics
Reverse applied
voltage
V
(AB) min
I
F
Commutation dI/dt
Stored charge
Fig.4 Commutation waveforms
the peak reverse applied voltage (PIV) . If N is the number of
series diodes and VRRM is the reverse repetitive voltage of the
diode then
N x V
RRM
= 2.4 x PIV (2.4 safety margin)....................(1)
In the case of bridge rectifiers
PIV = K x 1.57 x UDC ( single phase).........................(2)
PIV = K x 1.05 x UDC (Three phase)..........................(3)
Where UDC is the DC voltage and K is the mains overvoltage
factor typically 5%.
Using the above formula with K equal to 1.05 the number in
series is
N = 3.96 x U
DC
V
RRM
(Single phase)..........................(4)
N = 2.56 x U
DC
V
RRM
(Three phase)...........................(5)
3. VOLTAGE SHARING
a) Static
A series string of avalanche diodes will contain diodes with
different reverse leakage and differing avalanche voltage levels.
This is inevitable given that any production contains diodes
having a spread of characteristics and that diodes do not
normally have to be selected. The only criteria for avalanche
diodes used in a string is that they should have the same
repetitive voltage rating. This means that the leakage current at
the repetitive voltage will be less than the value given in the data
sheet.
When the diodes are connected in series without sharing
components there is a unique leakage current such that the sum
of the voltages across the individual diodes will be equal to the
applied voltage. According to the design rules given above the
design voltage per diode, assuming they share equally could be
V
diode
= V
RRM
……………
.......................................(6)
2.4
That is 416V for a 1000V diode and 583V for a 1400V diode.
The distribution of voltage between the diodes will depend upon
the applied voltage, the number of diodes and the leakage
characteristics ( these are temperature dependent)
The design voltage is considerably less than the avalanche
voltage however, it is conceivable that diodes of such extreme
characteristics could be in series causing one or more diodes to
avalanche during the reverse blocking of normal operation. This
is not serious because the current level will be of the order of
milliamps. If the equipment has been designed according to the
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