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公开(公告)号：US20180115263A1
公开(公告)日：2018-04-26
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：US20160233805A1
公开(公告)日：2016-08-11
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.
Abstract translation: 电路包括具有高侧开关装置和耦合到负载电压节点和电动机绕组输出的低侧开关装置的驱动电路。 控制器操作高侧开关装置和低侧开关装置。 当外部电源可用于提供负载电压节点时，控制器以正常模式工作以向电动机绕组输出提供电流以驱动电动机绕组。 响应于检测到外部电源的损失，控制器以升压模式操作高侧开关装置和低侧开关装置，以利用来自电动机绕组的反电动势（BEMF）电压来向负载提供电流 电压节点。
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