Powerful thyristor converter, 12/200-500 volts 500 watts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The described device is designed to convert a DC voltage of 12 V AC from 200 to 500 V and can deliver up to 500 W of power to the load.
The converter circuit is shown in fig. 4.40.
The frequency of the output alternating voltage is determined by the pulse frequency of the oscillator, made on transistors VT1 and VT2. These pulses through the transformer T1 control the thyristor switches VD1 and VD2, which alternately connect one or the other halves of the primary winding of the transformer T2 to a constant voltage source. The load is connected to terminals 4-5 of the transformer T2. The quality of the voltage converter operation largely depends on the correct selection of the capacitance of the capacitor C4. The capacitor is chosen correctly if, with fluctuations in the supply voltage within ± 10%, a clear alternate closing of the keys is provided.
The use of separating capacitors C2 and C3 increases the stability of the converter. Resistor R3 protects the Power Source from short circuit at the moment of switching the keys. The output voltage frequency of the device with the specified data is 200 Hz. If you provide for the possibility of changing the frequency of the oscillator (for example, instead of the oscillator, assemble a frequency-controlled multivibrator with a power amplifier), then at the output of the converter you can get a voltage with a frequency of 50 .... 400 Hz, which will allow you to use it for smooth control of the speed of rotation of synchronous electric motors with a power up to 500 W.
By changing the number of turns of the secondary winding of the transformer T2 accordingly, it is possible to obtain various sizes at the output of the voltage converter. Transformer T1 is wound on a W 16x10 core and has windings: I - 2x40 turns PEV-2-0,8, II - 2x10 turns PEV-2-0,2 ,2 and III - 20x2 turns of PEV-0,2-2. Transformer T50 is wound on a Sh60x2 core and has windings: I - 40x2 turns of PEV-3,0-800 and II - 2 turns of PEV-0,92-400. With such data, the output voltage of the converter is XNUMX V.
Avalanche thyristors PTL-100 are quite rare devices, but in this circuit it is allowed to use more common types of powerful thyristors. These thyristors must also be rated for switching currents of at least 100 A.
As a replacement, you can offer such thyristors for a current of 100 A: T151-100 or an older TWO (both of these thyristors do not belong to the avalanche class), but only more powerful ones are available from avalanche thyristors. These are TL171-250, TLP1-320 or TL2-160, TL2-200, TL2-250. There are also high-frequency thyristors, including those for 100 A, for example, TBSh-100, TCH100, TCHI100. All these powerful thyristors, despite their name, can operate at frequencies up to 500 Hz.
Author: Semyan A.P.
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