00:18Greetings, this video aims to provide evidence of the circuits
00:24in simulation in Proteus 8, 7, where I will give a brief introduction to the so-called cycloconverters,
00:30The controllers here are intended to supply variable alternating voltage and current.
00:35powered by an alternate source. Its operation is based on switching on and off at intervals.
00:41regular power supply to load. This converter consists of two semiconductors
00:46power supplies placed in antiparallel that control the connection of the source in each half cycle.
00:51They are classified according to the type of power component used in their construction.
00:56There are two types: controlled (SCR or TRIAC) and semi-controlled (SCR and TRIAC). Their applications are in ovens.
01:04industrial applications, induction furnaces, lighting control, starting and speed control
01:09of induction motors, reactive power control, solid-state relays. The TRIAC is a
01:15semiconductor device that belongs to the family of control devices, the
01:20thyristors. The TRIAC is essentially two thyristors connected in parallel but connected
01:25in opposite directions and sharing the same gate. Its operation is as follows:
01:30The positive part of the wave, the positive half-cycle, will pass through the TRIAC as long as there is
01:35There has been a trigger signal at the gate, in this way the current will flow from above
01:40The current going down will pass through the downward-pointing thyristor, in the same way. The negative part
01:46of the wave, negative half-cycle, will pass through the TRIAC as long as there has been a
01:51trigger signal at the gate, in this way the current will flow from bottom to
01:55The signal will pass through the upward-pointing thyristor for both half-cycles.
02:01The trigger is obtained from the same pin, the gate or door. The interesting thing is that
02:06The firing time of this pin can be controlled, and thus, the duration of the firing can be controlled.
02:11Each thyristor will be in teleconducting mode. Remember that a thyristor only conducts when
02:15The gate has been triggered, activated, and there is a positive voltage between its terminals.
02:20of a minimum value for each thyristor. Then, if the time that each thyristor
02:26It is in conduction, the current delivered to a load can be controlled and therefore
02:30Consequently, the power it consumes. Here is the single-phase converter cycle, as observed.
02:36If it works, the following circuit is a controlled three-phase rectifier.
02:42This type of rectifier allows the average output voltage to be varied, using for
02:46Its operation uses power thyristors with which the angle of the
02:51triggering and therefore the power delivered to the load. Thyristors are triggered at a specific interval.
02:563. The voltage ripple frequency at the output is 6 times the source frequency.
03:02Initially, 6FS, and the citing is less complex compared to that of converters
03:08Half-wave because it exhibits less ripple in the output voltage. This can be observed here.
03:13If it works, I hope you like it, thank you.
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