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Power in an AC Circuit

Power in an AC Circuit

In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, the power consumed for AC circuits with reactive components is calculated differently. Since electrical power is the "rate" at which energy is used in a circuit, all electrical and electronic components and devices have a safe operating range for electrical power.
In a DC circuit, there is no sinusoidal waveform associated with the supply; the voltages and currents are...

DC Generator

DC Generator

An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...

Conservation of AC Power

Conservation of AC Power

The principle of power preservation is applicable to both ac and dc circuits. This principle, when applied to AC power, asserts that the complex, real, and reactive powers produced by the source are equal to the total complex, real, and reactive powers absorbed by the loads. When two load impedances are connected in parallel to an ac source V, the complex power provided by the source can be calculated using the relation

Half wave rectifier

Half wave rectifier

A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.

Full wave rectifier

Full wave rectifier

A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.

Bridge rectifier

Bridge rectifier

The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...

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Related Experiment Video

Updated: Jul 20, 2026

How to Ignite an Atmospheric Pressure Microwave Plasma Torch without Any Additional Igniters

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Published on: April 16, 2015

A crowbarless power supply for klystrons.

H Kozu¹, Y Jumonji, C Yamazaki

¹Toshiba Corporation, 1-6 Uchisaiwai-cbo 1-Chome, Chiyodaku, Tokyo 100, Japan.

Journal of Synchrotron Radiation

|July 21, 2004

Summary

A new crowbarless power supply using a high-power switching inverter will be installed at the New SUBARU storage ring. This technology reduces costs and improves stability by eliminating crowbar circuits, crucial for quasi-isochronous rings.

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Area of Science:

Particle Accelerators
Power Electronics
Synchrotron Radiation

Background:

Traditional klystron power supplies in storage rings often rely on crowbar circuits.
Crowbar circuits can be expensive, unstable, and introduce voltage ripple.
The New SUBARU storage ring requires stable power with minimal voltage ripple, especially in quasi-isochronous operation.

Purpose of the Study:

To introduce a novel crowbarless power supply system for the New SUBARU storage ring.
To demonstrate the effectiveness of a high-power switching inverter in replacing conventional crowbar circuits.
To achieve significantly reduced low-frequency voltage ripple for enhanced storage ring performance.

Main Methods:

Installation of a new high-power switching inverter unit.
Integration of the inverter with the klystron power supply system.
Testing and validation of the power supply's stability and voltage ripple characteristics.

Main Results:

Successful elimination of the need for expensive and unstable crowbar circuits.
Realization of very small voltage ripple in the low-frequency region.
Demonstrated suitability for quasi-isochronous storage ring applications.

Conclusions:

The crowbarless power supply with a switching inverter offers a more stable and cost-effective solution.
The reduced voltage ripple is a key advantage for sensitive storage ring operations like New SUBARU.
This advancement contributes to improved reliability and performance in particle accelerator power systems.