Browsing by Author "Tsai, Tzu-Yang"

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BDCM Sensorless Control for Twelve-Step Square-Wave PWM
(2009)
Chen, Hung-Chi
;
Huang, Chih-Kai
;
Tsai, Tzu-Yang
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
After studying the development of BDCM sensorless control with six-step square-wave PWM (SWPWM) and six-step back-EMF detecting scheme (BEDS), the BDCM sensorless control with twelve-step SWPWM and twelve-step BEDS had been proposed and implemented in this paper. The proposed twelve-step BEDS generates the twelve commutation instants from six back-EMF zero-crossings during each cycle where the six-step BEDS generates the six commutation instants from six back-EMF zero-crossings. Since the analysis of six-step BEDS is helpful to develop the twelve-step BEDS, this paper studies the six-step SWPWM and six-step BEDS first and explains why some specific six-step SWPWM type is always used in the six-step BDCM sensorless control. Then, we obtain the specific twelve-step SWPWM types and develop the proposed twelve-step BEDS. From the simulated and experimental results, BDCM sensorless control with twelve-step SWPWM shows less current harmonics than that with six-step SWPWM.
Comparisons of Six-Step Square-Wave PWMs in Ultra-Low-Power SOC Integration
(2009)
Chen, Hung-Chi
;
Tsai, Tzu-Yang
;
Huang, Chih-Kai
;
電控工程研究所
;
Institute of Electrical and Control Engineering
It is well-known that ultra-low-power three-phase elements, such as ultra-small-size permanent-magnet brushless motor drivers, have been widely used in the consumer products. In order to reduce the cost, size and power consumption of products, it is necessary to integrate the system functions with square-wave PWM (SWPWM) driver in the system-on-chip (SOC) implementation. It follows that, the driver loss and loss distribution are the main challenges in the integration of ultra-low-power SWPWM driver where the driver loss include conducting loss, switching loss and gate driving loss, where the last one is often neglected in other low-, medium- and high-power drivers. On the other hand, there are 16 types and 64 types in 120-degree SWPWM and 180-degree SWPWM, respectively, and the resulting driver loss and loss distribution differ from each other. This paper studies the driver loss and loss distributions of all SWPWM types in detail. The result shows that SWPWM type-01_01, type-10_10 and type-010_010 are the recommended types in the SOC integration of ultra-low-power SWPWM driver.