Unijunction semiconductor tube trigger circuit

Published:2011/7/8 5:49:00 Author:Christina | Keyword: Unijunction, semiconductor tube, trigger circuit | From:SeekIC

This device can be used in wide range of applications, the trigger pulse is mainly produced by the unijunction semiconductor tube. By using the characteristics of the unijunction semiconductor tube and the RC charging and discharging circuit, we can form the oscilation circuit, this circuit is as shown in the figure. The VT is the unijunction semiconductor tube. The waveform and the oscillation circuit of the unijunction semiconductor tubeThe circuit in the figure uses the bridge rectifier and it also uses the same power supply with the main circuit to achieve the synchronization. The URL is the voltage of load. Unijunction semiconductor tube trigger circuit The waveform of the power supply which is rectified by the bridge rectifier circuit is as shown in the figure, it supplies the synchronous power to the trigger circuit. When the AC power supply voltage crosses zero, the UZ voltage is zero too, at this time the voltage between the two base electrodes of the VT is UBB=0, the peak point voltage Up of the VT is about zero, the VT and E-B conduct, the capacitor C will discharge all of the electric charge quickly.



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