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Brushless DC Motor Control Using PIC18FXX31 MCUs


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From Microchip Technology, Inc.
A PICDEM™ MC demo board was used to develop, test and debug the motor control code. The PICDEM MC has a single-phase diode bridge rectifier, converting AC input to DC and a power capacitor bank that keeps a stable DC bus. A 3-phase IGBT-based inverter bridge is used to control the output voltage from the DC bus. The control circuit and power circuits are optically isolated with respect to each other. An on-board fly-back power supply generates +5VD, with respect to the digital ground used for powering up the control circuit, including the PICmicro® device. +5VA and +15VA are generated with respect to the power ground (negative of DC bus). The feedback interface circuit is powered by +5VA, while +15VA supplies power to the IGBT drivers located inside the Integrated Power Module (IPM).
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