Editing Zero-crossing control

{{More citations needed|date=February 2022}}
'''Zero-crossing control''' (or '''burst-fire control''') is an approach for electrical control [[electrical circuit|circuits]] that starts operation with the [[alternating current|AC]] load voltage at close to 0 volts in the AC cycle.<ref name="Michael">{{cite news |last=Kugelman |first=Michael |url=https://www.powerelectronics.com/technologies/power-management/article/21860250/novel-zero-crossing-ssr-techniquecircuit |title=Novel Zero Crossing SSR Technique/Circuit |work=Power Electronics |date=2009-05-01 |accessdate=2021-09-17 }}</ref> This is in relation to solid-state relays, such as [[TRIAC]]s and [[silicon controlled rectifier]]s.<ref name="Michael" />  The purpose of the circuit is to start the TRIAC conducting very near the time point when the load voltage is crossing zero (at the beginning or the middle of each AC cycle represented by a sine wave), so that the output voltage begins as a complete sine-wave half-cycle.  In other words, if the controlling input signal is applied at any point during the AC output wave other than very close to the zero-voltage point of that wave, the output of the switching device will "wait" to switch on until the output AC wave reaches its next zero point. This is useful when sudden turn-on in the middle of a sine-wave half-cycle could cause undesirable effects like high-frequency spikes, for which the circuit or the environment is not expected to handle gracefully.

The point where the AC line voltage is zero is the ''zero cross point''. When a TRIAC is connected in its simplest form, it can clip the beginning of the voltage curve, due to the minimum gate voltage of the triac. A [[c:File:Simple Zero Crossing Circuit.png|zero-cross circuit]] works to correct this problem, so that the TRIAC functions as well as possible. This is typically done with [[thyristor]]s in two of the three phases.

Many opto-TRIACs come with zero-cross circuits built in.  They are often used to control larger, power TRIACs.  In this setup TRIAC turn-on delays compound, so quick turn-on times are important.

The corresponding [[Phasor|phase-angle]] circuits are more sophisticated and more expensive than zero-cross circuits.

==References==
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==External links==
* [https://web.archive.org/web/20081216171210/http://www.ee.uidaho.edu/ee/classes/ECE340/SimpleMethods.pdf Simple Methods for Detecting Zero Crossing]
* [https://dextrel.net/dextrel-start-page/design-ideas-2/mains-zero-crossing-detector  Isolated High Quality Mains Voltage Zero Crossing Detector]

[[Category:Electrical circuits]]


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