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SKIC2001A Datasheet(PDF) 4 Page - Semikron International |
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SKIC2001A Datasheet(HTML) 4 Page - Semikron International |
4 / 5 page 4 0699 © by SEMIKRON Functional description Interlock Fig. 2 demonstrate the right function of interlock of TOP- and BOTTOM-IGBT. Fig. 2 Interlock function At first BOTTOM is switched off immediately after the corresponding input signal (at 5 µs), while TOP is switched on with a delay of about 1 µs (setting of interlock 4 µs). After 10 µs both inputs become „on“. This isn’t a correct state (both IGBT „on“ means short circuit) and that is why both are switched off. A switch on of BOTTOM is possible not before TOP is „off“ (at 25 µs, interlock and delay time about 5 µs). Fig. 3 shows the behavior, if the interlock function isn’t active (SELECT „low“). Both outputs react immediately to the corresponding input (the difference is the signal delay time). Fig. 3 Interlock function not active Shortpulse suppression Fig. 4 presents the short pulse suppression. Pulses shorter than 480 ns are suppressed (noise) and pulse longer than 640 ns are valid. Fig. 4 Short pulse suppression VCEsat error processing Fig. 5 VCE-error processing In Fig. 5 the signals at the signal transformer are described. About 860 ns after TOP is „on“ (delay time), we see a positive needle on the transformer at the gate driver side and the IGBT will switch on. After about 3 µs a VCE- error signal will appear, the IGBT will switch off and an error-signal (smaller positive needle) is transformed to the low voltage side. The control IC processes this signal and gives an off impulse (negative needle) to the IGBT. (The needles on the transformers are converted in rectangular pulses by a gate driver input with Schmitt trigger- characteristic). |
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