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1. 发明申请

WO2014159092A2 SINE MODIFIED TRAPEZOIDAL DRIVE FOR BRUSHLESS DC MOTORS 审中-公开
标题翻译：用于无刷直流电动机的变形轨道驱动器
公开(公告)号：WO2014159092A2
公开(公告)日：2014-10-02
申请号：PCT/US2014021918
申请日：2014-03-07
申请人： MICROCHIP TECH INC
发明人： BROWN WARD R , HENDRICKS HOWARD
IPC分类号： H02P7/29
CPC分类号： H02P7/00 , H02P6/10 , H02P6/182 , H02P2209/07
摘要： 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.
摘要翻译：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。

2. 发明申请

WO2011044106A3 VARIABLE PULSE WIDTH MODULATION FOR REDUCED ZERO-CROSSING GRANULARITY IN SENSORLESS BRUSHLESS DIRECT CURRENT MOTORS 审中-公开
标题翻译：用于无传感无刷直流电机中减少零交叉粒度的可变脉冲宽度调制
公开(公告)号：WO2011044106A3
公开(公告)日：2011-06-03
申请号：PCT/US2010051444
申请日：2010-10-05
申请人： MICROCHIP TECH INC , BROWN WARD R
发明人： BROWN WARD R
IPC分类号： H02P6/18
CPC分类号： H02P6/185 , H02P6/182
摘要： Zero-crossing detection accuracy is enhanced in a sensorless brushless direct current (BLDC) motor by increasing the PWM drive frequency in anticipation of a zero-crossing event in any one or more commutation periods. Once a zero-crossing event is detected, the PWM frequency can go back to a lower normal operating frequency. Switching losses of the power drive transistors are thereby minimized while maintaining accurate zero-crossing detection for stable operation of the BLDC motor.
摘要翻译：在无传感器无刷直流（BLDC）电动机中，通过在任何一个或多个换向周期内预期过零事件增加PWM驱动频率来提高零交叉检测精度。一旦检测到过零事件，PWM频率就可以恢复到较低的正常工作频率。从而使功率驱动晶体管的开关损耗最小化，同时保持用于BLDC电动机稳定运行的精确过零检测。

3. 发明申请

WO2011044104A3 SYNCHRONIZED MINIMUM FREQUENCY PULSE WIDTH MODULATION DRIVE FOR SENSORLESS BRUSHLESS DIRECT CURRENT MOTOR 审中-公开
标题翻译：同步无刷直流电机同步最小频率脉宽调制驱动
公开(公告)号：WO2011044104A3
公开(公告)日：2012-03-15
申请号：PCT/US2010051441
申请日：2010-10-05
申请人： MICROCHIP TECH INC , BROWN WARD R
发明人： BROWN WARD R
IPC分类号： H02P6/18
CPC分类号： H02P6/182 , H02P6/188
摘要： Drive voltages to a sensorless brushless DC motor are regulated by varying the width of a single drive pulse (PWM pulse) centered in each of the commutation periods. Switching losses are thereby cut to an absolute minimum because there are only two transitions (on and off) in each drive commutation period. Back EMF zero-cross detectors determine the electrical timing relationships during each electrical cycle. Since the PWM drive pulses are always centered in each of the commutation periods, there will always be back EMF available for measurement of "zero-crossings." A digital device controls power switching transistors to produce one single PWM pulse during each of the commutation periods.
摘要翻译：通过改变以每个换向周期为中心的单个驱动脉冲（PWM脉冲）的宽度来调节无传感器无刷直流电动机的驱动电压。因此，由于在每个驱动器换向周期中只有两个转换（导通和截止），因此开关损耗被削减到绝对最小值。反电动势零交叉检测器确定每个电循环期间的电时序关系。由于PWM驱动脉冲总是在每个换向周期中居中，所以总是有反向EMF可用于测量“过零点”。数字设备控制功率开关晶体管，以在每个换向周期期间产生单个PWM脉冲。

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