SU1248037A1 - Pulser - Google Patents

Abstract

The invention relates to automation and pulse technology. It can be used in a television display device of the light valve type information for converting the voltage to the pulse frequency. The aim of the invention is to expand the range of over-, frequency tuning of the generated pulses, increasing the amplitude and stability of the amplitude of the output pulse. To do this, a device containing a controlled single-junction transistor (OPT. 1, output transformer 2, resistors 3 and 7, bipolar transistor 4, capacitor 5, an additional transformer 6, capacitor 8, new connections. Optically controlled OPT 1 LED 9 enters. Resistor 7 is made variable. A series connection of the secondary windings of transformers 6 and 2 allows the energy of a shock excitation circuit 6–8 to be used, transforming it into an amplitude of the output pulse voltage. The generator pos 0 (L 00: o

Description

1248037

It is possible to obtain a peak value of the sufficient voltage of the transition of the emitting-output pulse, which is equal to the voltage — the first base of the OPT 1 in the whole power supply with the loss of the frequency tuning loss on the basis of frequency. 1 il.

The invention relates to automation and pulse technology and can be used, in particular, in a television display device of the light valve type information for converting a voltage into a pulse frequency.

The aim of the invention is to expand the frequency range of the generated pulses, increasing the amplitude and stability of the amplitude of the output pulse.

The drawing shows an electrical; schematic diagram of the proposed pulse generator.

The pulse generator contains optically controlled unijunction transistor (opt) 1, the first base of which through the primary winding of the output transformer 2 is connected to the negative pole of the power source (not shown) and the second base through the first resistor 3, to the bipolar transistor 4 and a capacitor 5 connected between the negative pole of the power source and interconnected by the emitter of the OPT 1 and the collector of the bipolar transistor 4, the additional transformer 6, the first output of the primary second winding is connected to a second connection between the base 1 and OPT based .4 bipolar transistor, an emitter through a second resistor 7 connected to the positive pole of the power source. The second output of the primary winding of the additional transformer 6 is connected via the second capacitor 8 to the positive pole of the power source, and the secondary winding of the additional transformer 6 is sequentially connected to the secondary winding of the output transformer 2. The optical controlled single-junction transistor 1 includes a light diode 9. Resistor 7 is made of variable4.

The pulse generator works as follows.

When the power source is turned on, the voltage on the capacitor 5 is linear

increases under the action of the charge current flowing through the circuit: transistor 4 and resistor 7. The magnitude of the charge current is determined by the voltage drop across resistor 3, which depends on the resistance between the first and second bases of OPT 1. The resistance between OPT bases is known 1 varies with input. the current supplied to the LED 9. By controlling the transmission ratio of the OPT 1 through the optical channel, you can simultaneously increase or decrease the charge current of the capacitor 5. With a change in the charge current of the capacitor 5, the voltage rise rate on its plates changes while the load threshold changes OPT 1, this leads to the displacement of the moment when OPT 1 is turned on over wider limits towards the high frequencies of the generated pulses.

At the moment when OPT 1 is triggered, capacitor 5 is discharged through transformer 2. At the same time, a voltage pulse is created on resistor 3, which opens transistor 4, thereby providing an increase in current to OPT emitter circuit 1. Pulsed

the voltage across the resistor 3 excites the percussion excitation circuit from a series-connected capacitor 2 and transformer 6. Excitation of oscillations in a series circuit

leads to the fact that the transistor 4 is closed by a surge voltage of opposite polarity with a delay relative to the moment of switching on the OPT 1 for a time determined by the half-wave

natural oscillations of the contour 6-8. If transistor 4 is charged for a time greater than or equal to the recovery time of the OPT 1, then the last

will restore the blocking property of the emitter – first OPT 1 transition and the circuit will come back to the initial state. The serial connection of the secondary windings of transformers 6 and 2 allows the use of the energy of the circuit 6-8 of the shock excitation, transforming it into the amplitude of the output pulse voltage.

Thus, the proposed generator allows one to obtain a peak value of the output pulse equal to the supply voltage minus the residual voltage of the transition emitter – first base of the OPT 1 over the entire frequency tuning range.

Claims (1)

Invention Formula A pulse generator containing a unijunction transistor, the first base of which through the primary winding of the output transformer is connected to the negative pole of the power source, and the second base through the first resistor to the positive pole of the power source, the second resistor connected by one output to the positive pole of the power source, one the output of the secondary winding of the output transformer is connected to the first Compiler P. Plotnikov Editor A. Lezhnin Tehred E. Chizhmar Proofreader M. Sharoshi. Order 4140/57 Circulation 816 Subscription VNrdapi State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 0 five 0 five output terminal, a bipolar transistor and a capacitor connected between the negative pole of the power source and interconnected by the emitter of the single junction transistor and the collector of the bipolar transistor, characterized in that, in order to extend the frequency tuning range, increase the amplitude and amplitude stability of the output pulse, into it An additional transformer was introduced, one output of the primary winding of which is connected to the interconnected second base of a single junction transistor and a bipolar base transistor, and the second output of the primary winding of an additional transformer is connected through the input of a second capacitor to the positive pole of the power source, with one pin of the secondary winding of the additional transformer connected to the second output terminal and the other pin connected to another output of the secondary winding of the output transformer, the secondary windings of transformers are connected according to , the single transistor is optically controlled, the second resistor is made variable, and its other output is connected with a bipolar transistor emitter. .