Browsing by Author "Hu Jwu-Sheng"

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Controller apparatus for controlling a multiphase multilevel voltage source inverter and a method thereof
(2014-03-11)
Hu Jwu-Sheng
;
Chen Keng-Yuan
;
Tang Chi-Him
The present invention provides an apparatus for controlling a multiphase multilevel voltage source inverter. The apparatus includes a signal-generating unit and a converter. The signal-generating unit responds to an input signal to produce a switching strategy control signal and a duration timing control signal corresponding to the switching strategy control signal. The converting unit responds to the switching strategy control signal and the duration timing control signal to produce a switching signal. The voltage source inverter responds to the switching signal to generate a multiphase-and-multilevel AC voltage output.
Driving method and driving device for driving a polyphase inverter
(2013-09-17)
Hu Jwu-Sheng
;
Chen Keng-Yuan
A driving method for driving a polyphase inverter includes: receiving a reference input that includes a fundamental frequency component, and a previously generated feedback signal; generating an error signal that corresponds to a difference between the reference input and the previously generated feedback signal; attenuating the error signal to the minimum; generating an optimum signal; quantizing the optimum signal; and generating driving signals that correspond to the quantized optimum signal. A driving device that implements the driving method is also disclosed.
Glove puppet manipulating system
(2013-10-29)
Hu Jwu-Sheng
;
Wang Jyun-Ji
;
Sun Guan-Qun
;
Tang Chi-Him
A glove puppet manipulating system comprises a control module for generating control signals base on movements of human hand and a robot electrically connecting the control module installed inside a glove puppet. The robot has a body manipulating apparatus disposed on a foundation to manipulate the body of the glove puppet to rotate, a pair of hand manipulating apparatuses disposed on the body manipulating apparatus to manipulate the hands of the glove puppet to swivel, and a head manipulating apparatus interposed between the hand manipulating apparatuses on the body manipulating apparatus to manipulate the head of the glove puppet to nod.
Multi-level Multi-phase VSI Control Using Multi-dimensional Feedback Quantization
(2014-01-01)
Chen Keng-Yuan
;
Hu Jwu-Sheng
;
電機工程學系
;
Department of Electrical and Computer Engineering
A switching strategy for multi-level multi-phase voltage source inverter (VSI) based on optimal feedback quantization is derived. The contributions include the improved harmonics distortion comparing with the conventional SVPWM and the realizable block diagram of quantization to produce optimal switching state. By finding the most significant switching state, the implementation of quantization block needs only adders and comparators. Further, the implementation complexity of quantization is independent of phase/level numbers. In the simulation, the comparison of the proposed method and SVPWM confirms the effectiveness of the proposed method.
Spatially pre-processed target-to-jammer ratio weighted filter and method thereof
(2014-04-29)
Hu Jwu-Sheng
;
Lee Ming-Tang
The present invention provides a spatially pre-processed target-to-jammer ratio weighted filter and a method thereof, which uses two microphones to receive audio signals. The audio signals are divided into a plurality of sinusoidal waves by a fast Fourier transform (FFT) module, and a beamformer uses the sinusoidal waves to generate beamformed signals. A reference generator generates at least one reference signal. The beamformed signals and reference signals are used to work out power spectral densities (PSD), and a target-to-jammer ratio (TJR) is worked out with the power spectral densities. TJR is used to determine whether a sound source exists. According to the determination result, a noise estimator is switched to eliminate noise from the beamformed signals and generate output signals. An inverse fast Fourier transform (IFFT) module recombines the output signals and then outputs the recombined signals.
Switching driving method used for a driving system
(2014-06-24)
Hu Jwu-Sheng
;
Jao Hsien-Tang
The present invention discloses a switching driving method used for a driving system. The driving system transforms any type of waveforms to switching signal array by switching strategy modulation, and transmits to switching circuit. Any type of driving waveforms can be generated through high-speed switching the switching circuit. The waveforms can be generated by operating the switching circuit with the switching strategy. The losses of the switch can be reduced, and the modulation ability of driving signal having several waveforms and multi-channels can be improved.