Novel IGBT current feedback dead time compensation method
A dead-time compensation and current feedback technology, applied in the field of dead-time compensation, can solve the problems of increased low-order harmonics, system instability, and reduced output voltage fundamental wave amplitude, achieving low-speed performance improvement, good compensation effect, and current The effect of waveform distortion rate reduction
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[0051] Usually in the inverter circuit of the frequency converter, the upper and lower power switching devices of the same phase bridge arm work in a complementary state. Such as figure 1As shown, the inverter circuit in the frequency converter is composed of 6 IGBT switch tubes, and the two switch tubes of VT1 and VT4, VT3 and VT6, VT5 and VT2 work in a complementary state respectively. The action of power devices requires a certain turn-on and turn-off time, and generally the turn-off time is longer than the turn-on time. In order to avoid shoot-through, time delay technology is adopted to insert enough dead time between the drive signals of the upper and lower transistors of the same-phase bridge arm to prevent shoot-through during the commutation process.
[0052] Take the U phase of the inverter as an example, assuming that i u A positive current flows out of the bridge arm, and a negative current flows into the bridge arm. Such as figure 2 As shown, when i u When >...
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