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公开(公告)号：US20190149071A1
公开(公告)日：2019-05-16
申请号：US16243614
申请日：2019-01-09
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown , Howard Hendricks
Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
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公开(公告)号：US20160254766A1
公开(公告)日：2016-09-01
申请号：US15053972
申请日：2016-02-25
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown
Abstract: BLDC adaptive zero crossing detection compares BEMF voltages from a floating phase of a BLDC motor to a reference voltage, measures a rising time interval during a rising BEMF period when the BEMF voltages are greater than the reference voltage, and a falling time interval during a falling BEMF period when the BEMF voltages are less than the reference voltage. The reference voltage is adjusted so that the rising and falling time intervals are substantially the same, thereby causing the drive voltage to be in phase with the motor self-generated voltage, thus ensuring maximum efficiency of the BLDC motor.
Abstract translation: BLDC自适应过零检测将来自BLDC电动机的浮动相的BEMF电压与参考电压进行比较，当BEMF电压大于参考电压时，测量上升BEMF周期期间的上升时间间隔，以及下降期间的下降时间间隔 BEMF电压小于参考电压时的BEMF周期。 调整基准电压使得上升和下降时间间隔基本相同，从而使驱动电压与电动机的自发电压保持同相，从而确保BLDC电动机的最大效率。
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公开(公告)号：US09071172B2
公开(公告)日：2015-06-30
申请号：US13959543
申请日：2013-08-05
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown , Howard F. Hendricks
CPC classification number: H02P7/00 , H02P6/10 , H02P6/182 , H02P2209/07
Abstract: A pulse width modulated (PWM) trapezoidal commutation drive to a brushless direct current (BLDC) motor is sine modified so that the applied drive voltage substantially matches the induced voltage generated in the BLDC motor. The values of the cosine of the angles between −30 degrees and +30 degrees are used to modify the duty cycle of the PWM drive signal dependent upon the rotor angular positions determined from the times between the zero crossing BEMF voltages measured at the unconnected motor terminals.
Abstract translation: 对无刷直流（BLDC）电机的脉宽调制（PWM）梯形换向驱动进行正弦修改，使得施加的驱动电压基本上与BLDC电机中产生的感应电压匹配。 使用-30度和+30度之间的角度的余弦值来修正PWM驱动信号的占空比，这取决于从在未连接的电动机端子处测得的过零BEMF电压之间的时间确定的转子角位置 。
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公开(公告)号：US10135369B2
公开(公告)日：2018-11-20
申请号：US15278291
申请日：2016-09-28
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown , Howard Hendricks
Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
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公开(公告)号：US08803448B2
公开(公告)日：2014-08-12
申请号：US13866859
申请日：2013-04-19
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown , Randy Yach
IPC: H05B37/02
CPC classification number: H05B33/0806 , H05B33/0815
Abstract: A constant current output sink or source eliminates a current limiting series resistor for a light emitting diode (LED) and maintains a constant light intensity from the LED for all operating and manufacturing variables of a digital device since the current through the LED is maintained at a constant value. The constant current output sink or source may be programmable for selection of a constant current value from a plurality of constant current values available.
Abstract translation: 恒定电流输出接收器或源极消除了用于发光二极管（LED）的限流串联电阻器，并且为了数字器件的所有操作和制造变量而保持来自LED的恒定的光强度，因为通过LED的电流维持在 恒定值。 恒流输出接收器或源可以是可编程的，用于从可用的多个恒定电流值中选择恒定电流值。
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Patent Agency Ranking
公开(公告)号：US20130234623A1
公开(公告)日：2013-09-12
申请号：US13866859
申请日：2013-04-19
Applicant: MICROCHIP TECHNOLOGY INCORPORATED
Inventor： Ward R. Brown , Randy Yach
IPC: H05B33/08
CPC classification number: H05B33/0806 , H05B33/0815
Abstract: A constant current output sink or source eliminates a current limiting series resistor for a light emitting diode (LED) and maintains a constant light intensity from the LED for all operating and manufacturing variables of a digital device since the current through the LED is maintained at a constant value. The constant current output sink or source may be programmable for selection of a constant current value from a plurality of constant current values available.
Abstract translation: 恒定电流输出接收器或源极消除了用于发光二极管（LED）的限流串联电阻器，并且为了数字器件的所有操作和制造变量而保持来自LED的恒定的光强度，因为通过LED的电流维持在 恒定值。 恒流输出接收器或源可以是可编程的，用于从可用的多个恒定电流值中选择恒定电流值。
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公开(公告)号：US09692331B2
公开(公告)日：2017-06-27
申请号：US15053972
申请日：2016-02-25
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown
Abstract: BLDC adaptive zero crossing detection compares BEMF voltages from a floating phase of a BLDC motor to a reference voltage, measures a rising time interval during a rising BEMF period when the BEMF voltages are greater than the reference voltage, and a falling time interval during a falling BEMF period when the BEMF voltages are less than the reference voltage. The reference voltage is adjusted so that the rising and falling time intervals are substantially the same, thereby causing the drive voltage to be in phase with the motor self-generated voltage, thus ensuring maximum efficiency of the BLDC motor.
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公开(公告)号：US20170093313A1
公开(公告)日：2017-03-30
申请号：US15278291
申请日：2016-09-28
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown , Howard Hendricks
Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
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公开(公告)号：US20140265967A1
公开(公告)日：2014-09-18
申请号：US13959543
申请日：2013-08-05
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown , Howard Hendricks
IPC: H02P7/00
CPC classification number: H02P7/00 , H02P6/10 , H02P6/182 , H02P2209/07
Abstract: A pulse width modulated (PWM) trapezoidal commutation drive to a brushless direct current (BLDC) motor is sine modified so that the applied drive voltage substantially matches the induced voltage generated in the BLDC motor. The values of the cosine of the angles between −30 degrees and +30 degrees are used to modify the duty cycle of the PWM drive signal dependent upon the rotor angular positions determined from the times between the zero crossing BEMF voltages measured at the unconnected motor terminals.
Abstract translation: 对无刷直流（BLDC）电机的脉宽调制（PWM）梯形换向驱动进行正弦修改，使得施加的驱动电压基本上与BLDC电机中产生的感应电压匹配。 使用-30度和+30度之间的角度的余弦值来修正PWM驱动信号的占空比，这取决于从在未连接的电动机端子处测得的过零BEMF电压之间的时间确定的转子角位置 。
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公开(公告)号：US11018606B2
公开(公告)日：2021-05-25
申请号：US16243614
申请日：2019-01-09
Applicant: Microchip Technology Incorporated
Inventor： Ward R. Brown , Howard Hendricks
Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.
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