![](https://d3ilqtpdwi981i.cloudfront.net/Ka3Dh2r9pMuAVrWygimuX4TR1RU=/425x550/smart/https://bepress-attached-resources.s3.amazonaws.com/uploads/ea/ba/36/eaba3696-7f86-465c-9bcf-560f6ec2a8e3/thumbnail_a85373dc-fd69-49d1-b73a-efd57e744e14.jpg)
Interleaving PWM waveforms is a proven method to reduce ripple in dc-dc converters. The present work explores interleaving for three-phase motor drives. Fourier analysis shows that interleaving the carriers in conventional uniform PWM significantly reduces the common-mode voltage. New DSP hardware supports interleaving directly with changes to just two registers at setup time, so no additional computation time is needed during operation. The common-mode voltage reduction ranges from 36% at full modulation to 67% when idling with zero modulation. Third harmonic injection slightly reduces the advantage (to 26% at full modulation). However, the maximum RMS common-mode voltage is still less than 20% of the bus voltage under all conditions. Low-voltage experimental results support the findings.
National Science Foundation (U.S.). Industry/University Cooperative Research Centers Program
- DC-DC Power Convertors,
- PWM Power Convertors,
- Digital Signal Processing Chips,
- Fourier Analysis,
- Additional Computation Time,
- Bus Voltage,
- Common Mode Voltage,
- DSP Hardware,
- Low-Voltage,
- Set-Up Time,
- Third Harmonic,
- Three Phase Motor,
- Uniform PWM,
- Wave Forms,
- Zero Modulation,
- Electric Drives,
- Pulse Modulation,
- Pulse Width Modulation,
- Power Electronics
Available at: http://works.bepress.com/jonathan-kimball/85/