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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
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Power in a Three-Phase Circuit01:15

Power in a Three-Phase Circuit

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Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...
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Power Distribution in Three-phase and Single Phase Circuits01:17

Power Distribution in Three-phase and Single Phase Circuits

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Power distribution within electrical circuits is a foundational aspect of residential and industrial energy systems. While single-phase power is common in residential settings, three-phase power is the standard for industrial environments with heavy machinery. Each system is different and has advantages, and it's crucial to understand the underlying principles of power distribution and material efficiency.
Single-Phase Power Distribution:
Single-phase circuits are typical in household settings;...
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The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
1.3K
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

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Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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Power01:08

Power

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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System
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Phased Array Focusing for Acoustic Wireless Power Transfer.

Victor Farm-Guoo Tseng, Sarah S Bedair, Nathan Lazarus

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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    Summary
    This summary is machine-generated.

    Acoustic wireless power transfer using ultrasonic phased arrays significantly boosts efficiency over inductive methods at greater distances. This technology focuses power, achieving higher transfer efficiencies for wireless charging applications.

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    Area of Science:

    • Acoustics
    • Wireless Power Transfer
    • Ultrasonics

    Background:

    • Wireless power transfer (WPT) via inductive coupling faces efficiency limitations with increasing distance.
    • Acoustic wave-based WPT offers potential for higher efficiency, especially over longer ranges.
    • Ultrasonic phased arrays enable directional power focusing, overcoming distance-related WPT challenges.

    Purpose of the Study:

    • To demonstrate and evaluate the use of ultrasonic phased arrays for efficient wireless power transfer.
    • To compare the efficiency of acoustic WPT with inductive WPT systems.
    • To investigate the impact of array configuration and focal distance on power transfer efficiency.

    Main Methods:

    • Utilized a 37-element ultrasonic phased array (7 cm diameter) operating at 40 kHz in air.
    • Focused acoustic power to a 1.1-cm diameter receiver transducer.
    • Developed and validated numerical models to predict energy transfer behavior.
    • Constructed and compared an equivalent inductive WPT system.

    Main Results:

    • Achieved a 2.6x increase in efficiency compared to a single transducer at 5 cm distance (nearly 5x receiver diameter).
    • Reached a peak overall efficiency of 4% at 5 cm distance.
    • Maintained relatively constant efficiency up to 9 cm by adjusting focal distance.
    • Acoustic WPT outperformed inductive WPT for distances greater than 5 cm.
    • Modeling predicted doubling efficiency with more elements.

    Conclusions:

    • Ultrasonic phased arrays significantly enhance wireless power transfer efficiency over distance.
    • Acoustic WPT is a viable alternative to inductive WPT, particularly for mid-range applications.
    • Further improvements in efficiency are achievable by scaling the number of array elements.