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BLDC adaptive zero-cross detection method, motor controller and system

A zero-cross detection, motor technology, used in AC motor control, electronic commutation motor control, control systems, etc., can solve problems such as damaged samples

Active Publication Date: 2021-07-20
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, motor characteristics can damage these samples

Method used

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  • BLDC adaptive zero-cross detection method, motor controller and system
  • BLDC adaptive zero-cross detection method, motor controller and system
  • BLDC adaptive zero-cross detection method, motor controller and system

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Embodiment Construction

[0033] According to various embodiments, a digital-to-analog converter (DAC) may be used to provide the BEMF reference voltage. A voltage comparator can be used to detect zero crossing events from the BEMF voltage coupled from the undriven motor phase of the BLDC motor. Next, the DAC level is adjusted so that the applied voltage waveform is in phase with the waveform produced by the motor. In conventional BLDC control systems, there is a strong rejection of BEMF reference voltages that are not somehow derived from the motor supply voltage or the motor terminals themselves. The invention disclosed herein breaks this trend and mainly provides a hardware solution, whereas existing BLDC control techniques are focused on software solutions.

[0034] Referring now to the drawings, details of certain example embodiments are schematically illustrated. Like elements in the drawings are denoted by like numerals, and like elements are denoted by like numerals with different lowercase l...

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Abstract

BLDC Adaptive Zero Crossing Detection compares the BEMF voltage in the floating phase of the BLDC motor with a reference voltage; the rising time interval is measured during the rising BEMF period when the BEMF voltage is greater than the reference voltage, and when the BEMF voltage is less than The reference voltage is measured during the falling BEMF period during the falling time interval. The reference voltage is adjusted such that the rising and falling time intervals are substantially the same, thereby causing the drive voltage to be in phase with the voltage generated by the motor itself, thus ensuring maximum efficiency of the BLDC motor.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to commonly owned US Provisional Patent Application No. 62 / 121,767, filed February 27, 2015; which is hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to brushless direct current (BLDC) motors, and more particularly, the present invention relates to adaptive zero-crossing detection in BLDC motor applications. Background technique [0004] Brushless DC (BLDC) motors are used in industries such as home appliances, automotive, aerospace, consumer, medical, industrial automation equipment and instruments. Instead of using brushes for commutation, BLDC motors use electronic commutation. BLDC motors have advantages over brushed DC motors and induction motors, such as: better speed with respect to torque characteristics, higher dynamic response, higher efficiency, longer operating life, longer between services time intervals, substant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/182
CPCH02P6/182H02P6/20H02P27/08
Inventor W·R·布朗
Owner MICROCHIP TECH INC