ABB ZCU-14（3AXD5000005164）Control Unit

ABB ZCU-14（3AXD5000005164）Control Unit

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A first estimation of dynamical losses can be done utilizing Figure 24. The diagram hints out typical losses depending on RG, IC and junction temperature Tvj. 

The switching loss diagram Figure 24b and Figure 35b shows also the allowed external gate resistor values. The left end of the curves in Fig 24b and Fig 35b specifies the minimum allowed external gate resistor value. The gate resistors must not be lower because this may lead to a destruction of the device. The short circuit characteristic strongly depends on application specific parameters like temperature, stray inductances, gate driving circuits and the resistance of the short circuit path. For device characterization, a test setup as drawn in Figure 25a is used. One IGBT is short circuited while the other IGBT is driven with a single pulse. 

The corresponding typical voltage and current waveforms are illustrated in Figure 25b. The current in the conducting IGBT increases rapidly with a current slope that is depending on parasitic inductances and the DC-Link voltage. Due to desaturation of the IGBT, the current is limited to about 5 times the nominal current in case of IGBT3 and the collector-emitter voltage remains on the high level. The chip temperature increases during this short circuit due to high currents and thus high losses. Because of the increasing chip temperature the current decreases slightly while operating in short circuit condition. Within a defined short-circuit-withstand time tsc the IGBT has to be switched off to avoid a device failure.

ABB ZCU-14（3AXD5000005164） Technical drawing:

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