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Later versions are sold under the trademark "Snubberless" and "ACS" (AC Switch, though this type also incorporates a gate buffer, which further precludes Quadrant I operation). Littelfuse also uses the name "Alternistor". Philips Semiconductors (now NXP Semiconductors) originated the trademark "Hi-Com" (High Commutation).
Zero-crossing control (or burst-fire control) is an approach for electrical control circuits that starts operation with the AC load voltage at close to 0 volts in the AC cycle. [1] This is in relation to solid-state relays, such as TRIACs and silicon controlled rectifiers. [1]
In AC circuits, SCR or triac relays inherently switch off at the points of AC zero cross when there is zero load current. The circuit will never be interrupted in the middle of a sine wave peak, preventing the large transient voltages that would otherwise occur due to the sudden collapse of the magnetic field around the inductance.
A TRIAC resembles an SCR in that both act as electrically controlled switches. Unlike an SCR, a TRIAC can pass current in either direction. Thus, TRIACs are particularly useful for AC applications. TRIACs have three leads: a gate lead and two conducting leads, referred to as MT1 and MT2.
The triac is a device that is essentially an integrated pair of ... A few applications of power semiconductors in switch mode ... and AC and DC electric ...
Phase-fired control (PFC), also called phase cutting or phase-angle control, is a method for power limiting, applied to AC voltages. [1] It works by modulating a thyristor, SCR, triac, thyratron, or other such gated diode-like devices into and out of conduction at a predetermined phase angle of the applied waveform. [2]
A TRIAC (TRIode AC), equivalent to two back-to-back SCRs, is a bidirectional switching device. A DIAC stands for DIode AC Switch. A gate turn-off thyristor (GTO) is a bipolar switching device. Electronic switches may also consist of complex configurations that are assisted by physical contact, for instance resistive or capacitive sensing ...
A solid-state relay uses a thyristor, TRIAC or other solid-state switching device, activated by the control signal, to switch the controlled load, instead of a solenoid. An optocoupler (a light-emitting diode (LED) coupled with a photo transistor ) can be used to isolate control and controlled circuits.