How does an IPM detect an overcurrent?
2.2.1. Short Circuit Protection (SCP) The IPM’s short circuit protection circuit detect the overcurrent by comparing the CIN pin voltage generated at the external shunt resistor. After the detection of an overcurrent, the SCP protection operates, turns off all low side IGBTs and the FO open drain is activated.
How does the IPM monitor a low side IGBT?
The IPM monitors the FO pin input voltage in order to turn off low side IGBTs. The low side IGBTs turn off period can be extended by external CR. (Fault pulse tuning) The device integrates an open drain output that need to be pulled up to external power supply. Figure 2.2.13 shows V-I characteristics of the FO pin as a representative example.
What is IPM thermal shutdown function?
IPM has thermal shutdown function by monitor the LVIC temperature. In case the LVIC temperature exceeds and keeps over the thermal shutdown trip level, the FO open drain is activated and all low side IGBTs turn off. ■ Shutdown (TSD) Operating sequence (Monitoring LVIC temperature) d1. Normal operation. IGBT ON and outputs current Ic. d2.
How to protect IPM from extra surge?
Snubber Circuit In order to protect IPM from extra surge, the wiring length between the smoothing capacitor and the P pin-N points (shunt resistor terminal) should be as short as possible. Also, from 0.1μF to 0.22μF snubber capacitor should be mounted in the DC-link and near to the P pin and N points.
How many control supplies are needed for three-phase inverter circuit driving?
For three-phase inverter circuit driving, normally four isolated control supplies (three for high side driving and one for low side driving) are necessary. The use of floating control supply with bootstrap circuit can reduce the number of isolated control supplies from 4 to 1 (Low side control 15V supply).
What is IPM ul1557?
IPM is certificated by UL1557 at the condition of 2500Vrms with a convex shape heat sink. The above specification shows the thermal resistance between chip junction and the case at steady state. The thermal resistance saturates in about 10s. The unsaturated thermal resistance or transient thermal impedance is reported in Figure 2.1.3.
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