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Related Concept Videos

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.
522
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
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Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

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Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
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Bus Impedance Matrix01:24

Bus Impedance Matrix

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Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
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Series R—L Circuit Transients01:22

Series R—L Circuit Transients

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In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
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RLC Series Circuits: Impedance01:29

RLC Series Circuits: Impedance

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When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining the performance of AC circuits. It is represented by Z, which is a combination of resistance and reactance, and depends upon the angular frequency, measured in ohms.
Thus, the magnitude of the impedance is given by the following equation,
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Related Experiment Video

Updated: May 24, 2025

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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Adaptive Impedance Matching with Fault Ride Through in Wireless Power Transfer for Implanted Medical Devices.

Han Wu, Yufei Cai, Haolun Wu

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    Summary
    This summary is machine-generated.

    This study introduces an adaptive matching network for wireless implantable medical devices (IMDs). It ensures optimal power delivery by automatically adjusting to environmental changes, improving device reliability.

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    Area of Science:

    • Biomedical Engineering
    • Electrical Engineering
    • Implantable Medical Devices

    Background:

    • Implantable medical devices (IMDs) are crucial in healthcare.
    • Wireless power transfer is key for miniaturized, neuron-interfacing IMDs.
    • Existing matching networks (MNs) lack adaptability to environmental and parameter variations.

    Purpose of the Study:

    • To develop an adaptive algorithm-based matching network (MN) for wireless IMDs.
    • To enhance system efficiency and reliability by automatically tracking maximum rectified voltage.
    • To integrate an active voltage limiter for chip protection.

    Main Methods:

    • Proposed an adaptive algorithm-based MN for wireless IMDs.
    • Integrated an active voltage limiter into the MN.
    • Implemented the system using TSMC 65nm technology for testing.

    Main Results:

    • The adaptive MN successfully tracked maximum rectified voltage despite ±15% inductance and ±10% frequency fluctuations at 500 MHz.
    • The integrated active voltage limiter effectively rejected excess power, safeguarding the chip.
    • The system demonstrated the ability to power previously unusable systems.

    Conclusions:

    • The developed adaptive MN significantly improves the performance and reliability of wireless IMDs.
    • The active voltage limiter offers a novel chip protection mechanism.
    • This adaptive approach is applicable to various IMDs beyond neural stimulation.