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IRS26072DSPbF
Figure 14: D3 conducting
Figure 15: Q4 conducting
However, in a real inverter circuit, the V S voltage swing does not stop at the level of the negative DC bus, rather it
swings below the level of the negative DC bus. This undershoot voltage is called “negative V S transient”.
The circuit shown in Figure 16 depicts one leg of the three phase inverter; Figures 17 and 18 show a simplified
illustration of the commutation of the current between Q1 and D2. The parasitic inductances in the power circuit
from the die bonding to the PCB tracks are lumped together in L C and L E for each IGBT. When the high-side
switch is on, V S1 is below the DC+ voltage by the voltage drops associated with the power switch and the parasitic
elements of the circuit. When the high-side power switch turns off, the load current momentarily flows in the low-
side freewheeling diode due to the inductive load connected to V S1 (the load is not shown in these figures). This
current flows from the DC- bus (which is connected to the COM pin of the HVIC) to the load and a negative
voltage between V S1 and the DC- Bus is induced (i.e., the COM pin of the HVIC is at a higher potential than the V S
pin).
Figure 16: Parasitic Elements
Figure 17: V S positive
Figure 18: V S negative
In a typical motor drive system, dV/dt is typically designed to be in the range of 3-5 V/ns. The negative V S transient
voltage can exceed this range during some events such as short circuit and over-current shutdown, when di/dt is
greater than in normal operation.
International Rectifier’s HVICs have been designed for the robustness required in many of today’s demanding
applications. An indication of the IRS26072D’s robustness can be seen in Figure 19, where there is represented
the IRS26072D Safe Operating Area at V BS =15V based on repetitive negative V S spikes. A negative V S transient
voltage falling in the grey area (outside SOA) may lead to IC permanent damage; vice versa unwanted functional
anomalies or permanent damage to the IC do not appear if negative Vs transients fall inside SOA.
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