Replacing the optothyristor T0125. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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In recent years, TO 125 optothyristors have become a fairly common device. However, despite all their advantages, they also have two significant drawbacks. This is the unreliability and instability of the parameters of the LED built into them. Perhaps its parameters float because this infrared emitter overheats and / or loses emission due to the large current flowing through it. The second disadvantage is the price. All this prompted me to develop a simple scheme for their equivalent substitution.
The first and simpler version of such a scheme is shown in Fig. 1.
I used AOU115 as an optocoupler. It is the “thyriaority” of this optocoupler that determines the ultimate simplicity of the circuit. All elements (except thyristor) are always cold.
Thyristor VS1 is controlled by short but powerful current pulses. This avoids heating elements. Capacitor C1 is slowly but constantly charged through a high resistance resistor R1 and diode VD1. The diode provides the appropriate polarity of the voltage across the storage capacitor C1. Zener diode VD2 limits the charge voltage level on this capacitor. This is done in order to limit the maximum peak current in the load. Resistor R2 performs the same function. Resistor R3 is the reference for the control electrode of the thyristor VS1.
Setting. If all elements are serviceable and correspond to the scheme, then the system starts working immediately after switching on. These values of the elements are designed for a switched voltage of 220 V. In other cases, it is necessary to select the resistance of the resistor R1. From R2 depends, first of all, the current of the control electrode and, to a lesser extent, the width of the control pulse. C1 is responsible for the width of this pulse, so these elements are selected depending on the type of thyristor.
Details. The zener diode is selected for a voltage up to 10 V, the storage capacitor - for a voltage slightly higher than the stabilization voltage of the zener diode. The capacitance of the capacitor can reach 1 uF, depending on the parameters of the pulse. I managed to find reference data for an interesting product AOU115 with great difficulty, and what was my surprise when I found the almost complete similarity of the limiting parameters with AOU103 up to the letter indices. True, in AOU115 there is a control electrode output from the thyristor.
The appearance and pinout of AOU115 are shown in fig. 2.
A small number of elements allows you to mount the circuit even on the thyristor electrodes.
Figure 3 shows another version of such a scheme.
The only functional difference from the previous version is the use of another, more common AOT115 optocoupler and its signal amplifier on VT110 instead of AOU1. As experiments have shown, A0T110 does not withstand the same operating mode for a long time as AOU115, although they have the same passport maximum pulse current. I can admit that I had low-quality copies of AOT110. If you wish, experiment for yourself.
The AOT110 pinout is shown in fig. four.
Everything else is exactly the same as in the previous version.
Author: V.B.Efimenko. Kiev City
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