This is made most evident by contrasting two simple circuit designs, one that works and one that doesn’t. In a triac phase control circuit, the triac is triggered ON only for specific portions of the AC half cycles, causing the load to operate only for that period of the AC waveform.

It is seen that Q2 conduction can commence only at the beginning of the positive half-cycle of the supply voltage. t A standard light dimmer circuit is presented in Fig. Ver el diagrama anterior.

We now know that a “triac” is a 4-layer, PNPN in the positive direction and a NPNP in the negative direction, three-terminal bidirectional device that blocks current in its “OFF” state acting like an open-circuit switch, but unlike a conventional thyristor, the triac can conduct current in either direction when triggered by a single gate pulse. Although the resulting circuit lacks the fine control ability of the more complex version (with capacitor and DIAC), it does function: (Figure below). : Zeit) unterhalb eines spezifizierten Werts zu halten.

Triac ist eine englische Abkürzung für Triode for Alternating Current.

The load will receive no power, the TRIAC refusing to fire at all, no matter how low or high a resistance value the control resistor is set to.

The Q1 gate resistor (R3) is calculated from the Q1 triggering current and the voltage of the de source; R1 =(E – VG1)/IG1. Identification of the MT1 and MT2 terminals must be done via the TRIAC’s part number with reference to a data sheet or book. 4 below.

Around this level the trigger diode (diac) is forced to fire causing the voltage to pass the trigger the gate of the triac. It is necessary for the photo cell to see the ambient light but be shielded from the lamp which is being controlled. An adjustment which is often employed along with some of the circuits reviewed above is demonstrated in Fig. Dadurch fließt der Laststrom mitunter nur durch Teilbereiche des Kristalls und kann so zu lokalen Überhitzungen und dadurch zur Schwächung und Zerstörung des Bauteils führen. The circuit ought to work: (Figure below). Anstelle der Steuerelektrode wird eine Leuchtdiode verwendet, um die p-n-Übergänge über den fotoelektrischen Effekt mit Ladungsträgern zu fluten und damit leitend zu machen. If S1 is opened during the supply negative half-cycle, Q2 cannot be triggered into conduction, again because of the lack of charge on C2.

6 above could be applied, however the load must be connected at the alternate location as revealed in the dotted lines. A simple lamp dimmer circuit is shown in Figure below, complete with the phase-shifting resistor-capacitor network necessary for after-peak firing. B. die mit Netzspannung betriebenen Glühlampen einer Lichtorgel angesteuert werden können, ohne dass für den Steuerkreis eine Gefahr durch die Netzspannung ausgeht. 19-28(b)]. For increased suppression it might be essential to maximize the number of turns to as high as it may be feasible, or inductances up to 5 H. The downfall of this type of RF coil based triac phase control circuit is that the load wattage has to be considered according to the choke wire thickness.



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