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Patent Agency Ranking
公开(公告)号：US10594237B2
公开(公告)日：2020-03-17
申请号：US15299029
申请日：2016-10-20
Applicant: Texas Instruments Incorporated
Inventor： Zachery S. Buckley , Seil Oh
Abstract: A system includes a timer to determine a time interval between successive commutation state changes of a brushless direct current (BLDC) motor. A speed calculator computes a speed of the BLDC motor based on the time interval. A threshold calculator determines a threshold based on the computed speed, the threshold specifying a calculation of back electromotive force (BEMF) and mutual inductance of the BLDC motor at a next state change of the BLDC motor. A state change trigger commands the next state change based on a measured voltage associated with a floating phase of the BLDC motor relative to the threshold.
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公开(公告)号：US09893659B2
公开(公告)日：2018-02-13
申请号：US15019326
申请日：2016-02-09
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Seil Oh , Tuan V. Tran , David R. Street , Juergen Luebbe , Quang Dieu An , John K. Rote
Abstract: A circuit includes a driver circuit having a high side switch device and a low side switch device coupled to a load voltage node and a motor winding output. A controller operates the high side switch device and the low side switch device. The controller operates in a normal mode to supply current to the motor winding output for driving a motor winding when an external power supply is available to supply the load voltage node. In response to detecting a loss of the external power supply, the controller operates the high side switch device and the low side switch device in a boost mode to utilize a back electromotive force (BEMF) voltage from the motor winding to supply current to the load voltage node.
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3.发明申请Increasing PWM Resolution for Digitally Controlled Motor Control Applications 有权提高数字控制电机控制应用中的PWM分辨率公开(公告)号：US20160233813A1
公开(公告)日：2016-08-11
申请号：US14972515
申请日：2015-12-17
Applicant: Texas Instruments Incorporated
Inventor： Jasraj R. Dalvi , Seil Oh , John K. Rote
IPC: H02P29/00
CPC classification number: H02P27/085 , H02P2209/09
Abstract: Systems and methods for increasing Pulse Width Modulation (PWM) resolution for digitally controlled motor control applications are described. For example, in some embodiments, a method may include receiving a clock signal having a given period; identifying a target duty cycle; calculating a comparison point based upon the given period and the target duty cycle; generating a PWM signal based upon the clock signal using the comparison point; and varying the comparison point to increase a resolution of an effective duty cycle of the PWM signal.
Abstract translation: 描述了用于增加数字控制电机控制应用的脉宽调制（PWM）分辨率的系统和方法。 例如，在一些实施例中，方法可以包括接收具有给定周期的时钟信号; 识别目标工作周期; 基于给定的周期和目标占空比计算比较点; 使用比较点根据时钟信号产生PWM信号; 并改变比较点以增加PWM信号的有效占空比的分辨率。
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公开(公告)号：US09991827B1
公开(公告)日：2018-06-05
申请号：US15425727
申请日：2017-02-06
Applicant: Texas Instruments Incorporated
Inventor： Zachery Scott Buckley , Seil Oh
Abstract: A method includes: outputting high side driver gate signals to a plurality of high side driver devices and outputting low side driver gate signals to a plurality of low side driver devices configured to control current supplied to a motor having coils coupled to receive the current at a plurality of phase nodes; at a time approximately prior to an expected zero crossing of a voltage at a selected one of the plurality of phase nodes, disabling the high side driver gate signal and the low side driver gate signal; measuring a back electromotive force (BEMF) voltage and observing a zero crossing time; estimating a next zero crossing time; prior to the next zero crossing time, disabling the high side driver gate signal and the low side driver gate signal and observing the selected one of the phase nodes to form a first sample; and following the next zero crossing time, observing a second voltage at the selected one of the phase nodes to form a second sample.
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公开(公告)号：US09762174B2
公开(公告)日：2017-09-12
申请号：US14972515
申请日：2015-12-17
Applicant: Texas Instruments Incorporated
Inventor： Jasraj R. Dalvi , Seil Oh , John K. Rote
CPC classification number: H02P27/085 , H02P2209/09
Abstract: Systems and methods for increasing Pulse Width Modulation (PWM) resolution for digitally controlled motor control applications are described. For example, in some embodiments, a method may include receiving a clock signal having a given period; identifying a target duty cycle; calculating a comparison point based upon the given period and the target duty cycle; generating a PWM signal based upon the clock signal using the comparison point; and varying the comparison point to increase a resolution of an effective duty cycle of the PWM signal.
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