Transcription of One Technology Way • P.O. Box 9106 • Norwood, MA 02062 ...
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One Technology Way • P.O. Box 9106 • Norwood, MA 02062 ...
AN-1316 APPLICATION NOTEOne Technology Way P. O . Box 9106 Norwood, MA 02062 -9106, Te l : Fax: Generating Multiple isolated Bias Rails for IGBT Motor Drives with Flyback, SEPIC, and uk Combination by Bob Zwicker Rev. 0 | Page 1 of 15 INTRODUCTION State-of-the-art motor drives use a 3-phase, insulated gate bipolar transistor (IGBT)-based inverter that is powered by a dc link voltage typically in the region of 400 V dc to 800 V dc. That high voltage rail can be derived directly from a 3-phase rectifier bridge filter combination or from a power factor corrected boost rectifier, which produces the high voltage rail from a 3-phase ac input (see Figure 1). The IGBTs are the main power switches, which provide a (typically 10 kHz) pulse width modulated (PWM) output to each of the three motor phases. Induction and permanent magnet motors generally have high winding inductance, which integrates this PWM voltage into a low frequency winding current waveform that is approximately sinusoidal in shape.
Secondary side voltage sensing can alternatively regulate a weighted combination of several outputs; however, these outputs normally must all be within one isolated domain.
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