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PDF R0472YS14E Datasheet ( Hoja de datos )

Número de pieza R0472YS14E
Descripción Distributed Gate Thyristor
Fabricantes IXYS 
Logotipo IXYS Logotipo
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R0472YS14E datasheet

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R0472YS14E pdf
WESTCODE An IXYS Company
Distributed Gate Thyristor types R0472YS12# to R0472YS16#
(iii)
15.0 Reverse Recovery Loss
K
Factor
=
t1
t2
15.1 Determination by Measurement
From waveforms of recovery current obtained from a high frequency shunt (see Note 1, Page 5) and
reverse voltage present during recovery, an instantaneous reverse recovery loss waveform must be
constructed. Let the area under this waveform be E joules per pulse. A new heat sink temperature can
then be evaluated from the following:
( )TK (new) = TK (original ) E k + f Rth(JK )
Where k=0.227 (°C/W)/s
E = Area under reverse loss waveform per pulse in joules (W.s.)
f = rated frequency Hz at the original heat sink temperature.
Rth(JK) = d.c. thermal resistance (°C/W).
The total dissipation is now given by:
W (TOT) = W (original) + E f
15.2 Determination without Measurement
In circumstances where it is not possible to measure voltage and current conditions, or for design
purposes, the additional losses E in joules may be estimated as follows.
Let E be the value of energy per reverse cycle in joules (curves in Figure 9).
Let f be the operating frequency in Hz
( )TK (new) = TK (original ) E Rth f
Where TK (new) is the required maximum heat sink temperature and
TK (original) is the heat sink temperature given with the frequency ratings.
A suitable R-C snubber network is connected across the thyristor to restrict the transient reverse voltage
to a peak value (Vrm) of 67% of the maximum grade. If a different grade is being used or Vrm is other than
67% of Grade, the reverse loss may be approximated by a pro rata adjustment of the maximum value
obtained from the curves.
NOTE 1- Reverse Recovery Loss by Measurement
This thyristor has a low reverse recovered charge and peak reverse recovery current. When measuring
the charge, care must be taken to ensure that:
(a) a.c. coupled devices such as current transformers are not affected by prior passage of high
amplitude forward current.
(b) A suitable, polarised, clipping circuit must be connected to the input of the measuring oscilloscope
to avoid overloading the internal amplifiers by the relatively high amplitude forward current signal
(c) Measurement of reverse recovery waveform should be carried out with an appropriate critically
damped snubber, connected across diode anode to cathode. The formula used for the calculation
of this snubber is shown below:
R2
=
4
Vr
CS di dt
Vr = Commutating source voltage
Where: CS = Snubber capacitance
R = Snubber resistance
Data Sheet. Types R0472YS12# to R0472YS16# AD Issue 1
Page 5 of 12
June, 2008

5 Page

R0472YS14E arduino
WESTCODE An IXYS Company
Figure 13 - Sine wave frequency ratings
1.00E+05
200A
R0472YS12# -16#
AD Issue 1
Tk=55°C
100% Duty Cycle
1.00E+04
550A
1kA
1.00E+03
2kA
3kA
1.00E+02
Distributed Gate Thyristor types R0472YS12# to R0472YS16#
Figure 14 - Sine wave frequency ratings
1.00E+05
200A
R0472YS12# -16#
AD Issue 1
Tk=85°C
1.00E+04
550A
1kA
1.00E+03
2kA
100% Duty Cycle
1.00E+02
3kA
1.00E+01
1.00E+01
1.00E-05
1.00E-04
1.00E-03
Pulse Width (s)
1.00E-02
1.00E+00
1.00E-05
1.00E-04
1.00E-03
Pulse width (s)
1.00E-02
Figure 15 - Square wave frequency ratings
1.00E+05
R0472YS12# -16#
AD Issue 1
200A
1.00E+04
550A
di/dt=100A/µs
Tk=55°C
100% Duty Cycle
1kA
1.00E+03
2kA
3kA
1.00E+02
Figure 16 - Square wave frequency ratings
1.00E+05
200A
R0472YS12# -16#
AD Issue 1
di/dt=500A/µs
Tk=55°C
1.00E+04 550A
1kA
100% Duty Cycle
1.00E+03
2kA
3kA
1.00E+02
1.00E+01
1.00E+01
1.00E+00
1.00E-05
1.00E-04
1.00E-03
Pulse width (s)
1.00E-02
1.00E+00
1.00E-05
1.00E-04
1.00E-03
Pulse width (s)
1.00E-02
Data Sheet. Types R0472YS12# to R0472YS16# AD Issue 1
Page 10 of 12
June, 2008

10 Page





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