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Method of driving brushless motors, corresponding device, motor and computer program product

A device and driver technology, applied in the direction of AC motor control, electronic commutation motor control, single motor speed/torque control, etc.

Active Publication Date: 2016-06-22
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, back EMF sensing during the PWM off-time requires that a minimum PWM "off" time must exist such that the PWM duty cycle is limited to less than 100%
In various applications, this may represent an unacceptable disadvantage

Method used

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  • Method of driving brushless motors, corresponding device, motor and computer program product
  • Method of driving brushless motors, corresponding device, motor and computer program product
  • Method of driving brushless motors, corresponding device, motor and computer program product

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Embodiment Construction

[0022] In the ensuing description, one or more specific details are shown in order to provide a thorough understanding of examples of embodiments. Embodiments may be obtained without one or more of the specific details, or with other methods, elements, materials, etc. In other instances, known structures, materials, or operations are not shown or described in detail so as not to obscure aspects of the embodiments.

[0023] Reference to "an embodiment" or "one embodiment" in the framework of this specification is intended to indicate that a specific configuration, structure, or characteristic described according to the embodiment is included in at least one embodiment. Thus, phrases such as "in an embodiment" or "in one embodiment," which may be present at one or more points in this specification, do not necessarily refer to the same embodiment. Furthermore, particular configurations, structures or characteristics may be combined in any suitable manner in one or more embodimen...

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Abstract

A driver device for driving a DC motor using PWM modulated drive signals includes comparator circuits for producing digitalized Back-EMF signals having first and second values as a function of the Back-EMF signals being above or below a respective threshold, and an inverter for driving the PWM modulated drive signals in a phased relationship with the digitalized Back-EMF signals. The driver device also includes controller circuits configured for controlling the respective threshold by minimizing the error between a time measured between two consecutive opposed edges of the digitalized Back-EMF signal and half a time measured between two consecutive homologous edges of the digitalized Back-EMF signal.

Description

technical field [0001] The present invention relates to techniques for driving brushless motors. One or more embodiments may be applied to controlling brushless direct current (BLDC) motors. Background technique [0002] In recent years, brushless direct current (BLDC) motors have received increasing attention, for example, for vehicular applications. This is due to the fact that BLDCs can have higher reliability / lifetime, lower maintenance costs, and quieter operation than their "brushed" DC counterparts. Over the past decade, continued advances in the production of power semiconductors and controller ICs, as well as permanent magnet brushless motors, have made it possible to manufacture reliable, low-cost solutions for a wide range of adjustable-speed applications. [0003] Applications where BLDC motors have been designed or are being used include, for example, power steering, engine cooling fans, fuel / water pumps, air conditioning compressors, heaters, ventilation, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P6/182
CPCH02P6/182H02P6/14H02P27/08
Inventor G·丹格罗V·克勒门特M·比索格诺
Owner STMICROELECTRONICS SRL
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