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AC-input BLDC motor drive

Products and reference designs
Block diagram

AC-input BLDC motor drive

Block diagram

Overview

Our integrated circuits and reference designs help you create compact, fully protected and efficient alternating current (AC) input speed-controlled brushless direct current (BLDC) drives with smooth torque and accurate speed control.

Design requirements

AC-input BLDC drives often require:

  • Small form factor, efficient and protected power stage.
  • Precise current and voltage sense for low torque ripple and sensorless speed control.
  • IEC-compliant isolated analog and digital interfaces.
  • Efficient small form factor non-isolated and isolated power supplies.
Explore applications similar in function and design

Block diagram

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AC-input BLDC motor drive

AC-mains (100-400Vac) AC-mains (100-400Vac) DC Link DC Link Status LEDs Status LEDs Speed reference Speed reference Source/Sink I/O, Pulse train Source/Sink I/O, Pulse train Control module, PC, field network connection Control module, PC, field network connection Switch/button Switch/button Segment display Segment display Vref Vref Multiple isolated rails (point-of-load) Multiple isolated rails (point-of-load) Vdd Vdd Rotary knob Rotary knob DC link voltage DC link voltage BLDC BLDC Optional, not required for sensorless control Optional, not required for sensorless control NTC NTC AC line voltage AC line voltage Non-isolated AC/DC power supply Non-isolated AC/DC power supply AC/DC rectifier AC/DC rectifier PFC PFC Inrush current control Inrush current control Over current protection Over current protection Isolated DC/DC power supply Isolated DC/DC power supply PWM controller PWM controller REF REF DC/DC DC/DC LDOs LDOs Digital input/output Interface Digital input/output Interface Isolated digital input receiver Isolated digital input receiver Protection Protection Digital output driver Digital output driver Isolator Isolator Self-diagnostics/monitoring Self-diagnostics/monitoring Temp sensor Temp sensor SVS SVS Comp Comp Analog input interface Analog input interface LDO LDO Protection Protection IsoAmp IsoAmp Digital processing Digital processing MCU MCU Logic Logic Buffer Buffer 3-phase power stage 3-phase power stage IGBTs/FETs IGBTs/FETs Half-bridge gate drivers Half-bridge gate drivers Current & voltage sense Current & voltage sense Reference Reference Amps Amps Comp Comp Position sensing Position sensing Hall sensors Hall sensors Hall sensor interface Hall sensor interface Level translator Level translator Load switch Load switch User interface User interface Buffer/driver Buffer/driver GPIO expander GPIO expander Shift register Shift register Isolator Isolator Fieldbus/configuration Interface Fieldbus/configuration Interface USB USB Protection Protection Isolator Isolator RS485 RS485 CAN CAN

Technical documentation

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Type Title Date
Technical article What is “real-time control” and why do you need it? PDF | HTML 28 Sep 2023
White paper High Voltage Isolation Quality and Reliability for AMC130x 27 Jun 2016
Analog Design Journal Pushing the envelope with high-performance digital-isolation technology (Rev. A) 22 Aug 2018
Application note Architecture for Brushless-DC Gate Drive Systems (Rev. A) 22 Aug 2018
Application note Sensorless Trapezoidal Control of BLDC Motors (DRV8312-EVM) 21 May 2015
White paper Replacing single-phase ACIMs with three-phase BLDC motors saves energy 15 Apr 2016
Application brief Voltage Reference Solutions in Motor Control Drives 10 May 2022
White paper Power Electronics in Motor Drives: Where is it? (Rev. A) 08 Oct 2019
White paper Fully integrated signal and power isolation – applications and benefits 04 Apr 2017
Application note Trapezoidal Control of BLDC Motors Using Hall Effect Sensors 01 Jul 2013

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