Photorelay with thyratron on MTX-90. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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The discharge ignition voltage between the anode and cathode in an MTX-90 thyratron, with a free grid, is 150–320 V. But if voltage is applied to the grid to excite the grid current, this discharge ignition voltage can be significantly reduced. With a grid current of 60 mA, for example, it is possible to lower the ignition voltage along the anode circuit by 50-80 V. This determines the rather high sensitivity of the photorelay, the circuit of which is shown in the figure.
From the divider R1R2, the voltage rectified by the diode D1 is fed through the resistor R3 and the winding of the electromagnetic relay P1 to the anode of the thyratron. The same voltage is applied to the grid power circuit, consisting of the FSK-1 photoresistor and the R5 potentiometer. Capacitor C1 smooths out the ripple of the supply voltage.
In the initial state, the voltage at the thyratron anode is lower than the ignition voltage. There is no current in the anode circuit and the relay does not work. When the photoresistor is illuminated, its resistance decreases sharply, the current through the potentiometer R5 increases, which leads to an increase in the grid voltage to the value of the discharge ignition voltage between the grid and the cathode. The thyratron ignites and relay P1 is activated. The voltage at the anode of the thyratron decreases, but remains above the burning voltage. Therefore, the relay armature is confidently held in the attracted state.
The photorelay is turned off with the Kn1 button.
Literature
- Radio No. 10 1969
Publication: N. Bolshakov, rf.atnn.ru
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