ABB INNPM22 Network Processor Module

ABB INNPM22 Network Processor Module

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The nominal diode current rating can be exceeded in an application for a short time. This is defined as repetitive peak forward current in the datasheet for the specified pulse duration, for example 1ms as noted in Figure 31. In theory, this value can be derived from the feasible power dissipation and the transient thermal impedance Zth, if the duration of the over current condition is defined. 

However, this theoretical value is not taking any limitations of bond wires, bus-bars or power connectors into account. To investigate the transient behavior of a diode, the surrounding circuitry as already shown in Figure 8 on page 11 has to be taken into account. To simplify the circuitry, the output current of the half bridge can be assumed to be constant during commutation. 

The remaining stray inductances formed by the current loop can now be replaced by just one stray inductance between high-side and low-side switch/freewheeling diode.

ABB INNPM22 Technical drawing:

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