00:06This video will discuss power semiconductors and explain how they work.
00:11of a TRIAC, and through simulation in Multisim the curve and firing will be described
00:15TRIAC driving.
00:17But what is a TRIAC? It can be described as two SCRSs, together, in opposite and parallel directions.
00:24which allow the passage of energy in both directions, whereas an SCR allows
00:28The conduction of energy in one positive direction is used to control the flow of
00:33average current to a load, with the particularity that it conducts in both directions and can be
00:38blocked by voltage reversal or by decreasing the current below the value
00:42maintenance.
00:43The TRIAC can be triggered independently of the gate polarization, i.e., by
00:49a positive or negative gate current.
00:52Here we will proceed to build the circuit; for this we will need a power source.
00:57Alternating current at 120 volts and 60 Hz, a lamp or light bulb serves as a signal, and a
01:09a 144-ohm resistor load, followed by a 10-kilo-ohm resistor, in series with
01:22a 200 kilo ohm potentiometer, an electrolytic capacitor,
01:442 iodines of 1 N4407G.
02:06And finally, a TRIAC MAX 08 MT1G.
02:17And we made the connections.
02:48Thank you!
02:59We verify the configuration of each element, to the extent.
03:30Thank you!
03:48Now in the oscilloscope connection, we have channel 1 connected to anode 1 of the TRIAC.
03:54Channel 2 is connected to the AC power source, and channel 3 of the oscilloscope is connected
04:12to the charging and discharging of the capacitor.
04:22But why put two antiparallel diodes, if we look at how a diode works?
04:27If we observe the image in forward polarization, if we want to conduct energy from the
04:31From anode to cathode the diode conducts energy, in reverse bias from the cathode to the
04:36The anode, the diode does not conduct energy, which is why it is called a semiconductor.
04:44Thus, in the simulation, if we remove a diode, we observe that the conduction of the
04:48energy is positive.
04:58If we remove the other diode, its conduction is negative.
05:14If we return to the initial configuration of the diodes in antiparallel, we observe the
05:19The TRIAC curve cutoff in its conduction is both positive and negative.
05:35Now in the simulation, it can be seen that by varying the potentiometer, we can vary the
05:40TRIAC firing angle, we can vary the driving angle, here it is presented
05:44the operation.
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