نتایج جستجو برای: منبع ولتاژ pwm
تعداد نتایج: 27408 فیلتر نتایج به سال:
We present a goal-seeking framework for decision-making to empower personal wellness management (PWM). PWM is a complex issue that lies at the intersection of multiple disciplines including psychology, exercise science, medicine, behavioral management, nutrition, and emerging technologies. Ultimately, the objective for the PWM enterprise is to encourage participants to become intrinsically moti...
To reduce the high-order harmonics produced by the high-power pulse width modulated (PWM) converters, selective harmonic elimination (SHE) scheme is commonly used due to its superior harmonic performance at low switching frequency. This Project proposes an active compensation method through the PWM control of SHE phase angle. An application example on a high-power PWM current-source rectifier (...
چکیده: در این مقاله، ساختار پیشنهادی بر مبنای اینورتر منبع امپدانسی ارائه شده است. در ساختار پیشنهادی دو ترانسفورماتور با سه سیمپیچ جایگزین دو سلف اینورتر منبع امپدانسی کلاسیک، شده است. ساختار جدید، دارای ضریب تقویت بالاتری نسبت به سایر اینورترهای منبع امپدانسی، مستقل از مقدار D است. همچنین بهمنظور دستیابی به شکلموج خروجی با کیفیت بسیار بالا، شاخص مدولاسیون بسیار بزرگ (نزدیک به یک) در نظ...
از آنجایی که گشتاور یک ماشین القایی توسط جریان ماشین و شار فاصله هوایی تعیین می گردد، کنترل مستقیم جریان به جای ولتاژ بسیار مناسب به نظر می رسد. همچنین مدولاسیون بردار فضایی (SVM) روش برتری برای اینورترها ی منبع جریان از نظر کاهش هارمونیک های مرتبه پایین، فرکانس کلیدزنی پایین تر و پیاده سازی آسان تر می باشد. این مقاله به معرفی مدولاسیون بردار فضایی برای اینورتر منبع جریان می پردازد. سپس با کن...
This paper presented a closed loop control of asymmetrical PWM full bridge converter; Renewable energy and distributed generation are getting more and more popular, wind turbines, and fuel cells. The renewable energy sources need the power electronics interface to the utility grid because of different characteristics between the sources and the grid. No matter what renewable energy source is ut...
BACKGROUND Individuals with reading disability or individuals with autism spectrum disorder (ASD) are characterized, respectively, by their difficulties in reading or social communication, but both groups often have impaired phonological working memory (PWM). It is not known whether the impaired PWM reflects distinct or shared neuroanatomical abnormalities in these two diagnostic groups. METH...
OBJECTIVES To explore whether people's organ donation consent decisions occur via a reasoned and/or social reaction pathway. DESIGN We examined prospectively students' and community members' decisions to register consent on a donor register and discuss organ donation wishes with family. METHOD Participants completed items assessing theory of planned behaviour (TPB; attitude, subjective norm...
T lymphocytes were derived by E rosetting from the peripheral blood (PB) and bone marrow (BM) of 15 patients with chronic granulocytic leukemia (CGL) in the chronic phase of their disease. T cells were also obtained from 12 healthy individuals. T cells were incubated overnight either in culture medium (RPMI) or RPMI plus pokeweed mitogen (PWM). The supernatants were then recovered and the cells...
A study of the kinetics of RNA and DNA synthesis in PWM-stimulated lymphocytes revealed that RNA synthesis preceded the onset of DNA synthesis by approximately 24 hr and that DNA synthesis and transformation was maximal between 66 to 78 hr. Histochemical and radioautographic studies on PWM stimulated cultures indicated that at 72 hr 50 to 60% of the cell population had been transformed by PWM, ...
This paper provides analytical and graphical tools for the study, performance evaluation, and design of the modern carrier based PWM methods which are widely employed in PWM-VSI drives. Simple techniques for generating the modulation waves of the high performance PWM methods are described. The two most important modulator characteristics, the current ripple and the switching losses are analytic...
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