6.3.1 IGBT Collector-emitter sustaining voltage (VCE*sus):IGBT集电极-发射极维持电压
The purpose is to ensure that the collector-emitter sustaining voltage of an IGBT
is not less than the maximum specified value V
CE*sus under specified conditions.文章来源：http://www.igbt8.com/jc/172.html
(see Figure 11)
Figure 11 – Circuit for measuring the collector-emitter sustaining voltage VCE*sus
The IGBT is operated in a saturated condition under pulse operation.
Due to the inductance L
, switching off the gate voltage causes the IGBT to be swept through a current-voltage cycle.
The voltage source V
CC1 is adjustable; it enables the collector current to be set to the specified value.
A voltage clamping unit, indicated in Figure 11 as a variable voltage source V
CC2 in series with a diode, limits the voltage V
CC2 is set to the expected value of V
The minimum value of load inductance L
may be given in the detail specification; otherwise, it may be calculated from
min = (V
CC2 – V
CC1) * t
off / 0,1 I
This ensures that I
C does not drop by more than 10% during t
The clamping unit is adjusted to operate at the specified minimum value V
CE*sus. With voltage V
CC1 set at zero, V
GE is adjusted so that the specified current I
C can be reached with a V
CE value in the saturated condition (point A in Figure 12).
The value V
CC1 is progressively increased until the specified current I
C is reached for the expected V
CE*sus (point B in Figure 12). As a result, the current at which the cycle starts may reach a value I
0 slightly higher than the specified current I
C (point A′ of Figure 12).
Figure 12 – Operating locus of the collector current
In a preliminary test, the action of the clamping unit should be verified by decreasing its adjustable voltage V
2; then the clamping unit should be adjusted to the desired value of V
CE that corresponds to the specified current I
C (point B of Figure 12).转载请注明出处：http://www.igbt8.com/
– The IGBT is satisfactory when the trace moving from point B to point C does not pass to the left of the line BC.
– When the clamping unit is not used, the IGBT is satisfactory if the trace effectively turns around point B, as shown in Figure 12.
– Case or ambient or virtual junction temperature T
c or T
a or T
– Collector current I
– Minimum sustaining voltage V
– Value of load inductance L
, where appropriate：合适的负载电感
– Value of unclamped stray inductance L
– Frequency of the gate voltage pulse generator V
G, if different from 50 Hz：门极电压脉冲发生器频率。
– Gate resistor R
2, if available：若需要，门极电阻R1，R2
– Gate voltage V
GG1 and V
GG2 (shall be specified)：门极电压VGG1及VGG2