AN1779无线电机讲义材料.pdf

AN1779 Sensored Single-Phase BLDC Motor Driver Using PIC16F1613 Authors: Mike Gomez BLOCK DIAGRAM Mark Pallones Figure 1 shows the block diagram of a single-phase Microchip Technology Inc. BLDC driver based on the PIC16F1613 microcontroller. The peripherals used in the application INTRODUCTION are: • Complementary Waveform Generator (CWG) This application note describes a driver solution for • Signal Measurement Timer (SMT) single winding single-phase BLDC, based on the • Analog-to-Digital Converter (ADC) PIC16F1613 microcontroller. The driver exploits two • Digital-to-Analog Converter (DAC) feedback loops: the inner loop, which is responsible for • Capture Compare PWM (CCP) the commutation control, and the outer loop which is • Fixed Voltage Reference (FVR) responsible for the speed control. The speed of the • Timer 1 (TMR1) motor is referenced to an external analog voltage. Fault • Comparator detection can be sensed during overcurrent and • Temperature Indicator overtemperature conditions. These peripherals are internally connected by firmware, significantly reducing the number of external pins required for the