SU150185A1 - Controlled ferrite transistor square pulse generator - Google Patents

Description

The known controlled ferrite-transistor oscillators of rectangular pulses require triggering pulses for their operation, or they have a master oscillator in the circuit. After the generator, the elements through which the circuit is controlled are installed. Such generators are complex in design, and their frequency of generation depends significantly on the supply voltage.

The proposed generator, to simplify its circuit, is made on one ferrite core, two oppositely connected windings of which contain a resistance and a capacitor, are connected in parallel and at one end connected to the "minus of the power supply and the other in the triode collector circuit. The output of one of the windings serves to start the generator, and its input to break the oscillations .. The other two core windings are turned on and form grounded emitter-triode base transitions.

The drawing is a schematic diagram of the described ferrite-transistor generator.

The generator consists of a core 1 with a rectangular hysteresis loop and windings 2, 3, 4 and 5; semiconductor triodes 6, 7; capacitors S, 9 and resistances 10, 11.

In the initial position, the triodes 6, 7 are closed, the capacitors 8, 9 are discharged, and the generator does not work. When the starting pulse arrives at point 12 of the collector winding of triode 7, the core / is set to state "1", since the current will first flow through the winding 5 and capacitor 9, charging it to the amplitude value of the pulse.

Upon termination of the starting pulse, the capacitor 9 is discharged through the winding 5 and the resistance //. The discharge current of this conden no. 150185-2 -

the sator will begin to remagnetize the core from the state “1 to the state” O, which will cause the occurrence of e. d. in the windings 2, 3; triode 6 will open. The collector current of this triode will flow through the winding 2 and the capacitor 8, charging it and accelerating the transition of the core to the “O” state.

At the end of the impulse, the capacitor 8 is discharged through the winding 2 and the resistance 10. The discharge current of the capacitor 8 at the same time, the core is reversal from the state "O to state" 1, which causes the appearance of e. d. in the windings 4, 5; triode 7 will open. The collector current of triode 7 will flow through the winding 5 and capacitor 9, charging it and accelerating the transition of the core to the state "1.

At the end of the pulse, the capacitor 9- is discharged through the winding 5 and the resistance //. The discharge current of capacitor 9 remagens the core from state "1 to state" O, and the whole process repeats. The generated frequency and pulse duration are determined by the capacitance of the capacitors S and I with resistances 10 and //, the boundary frequency of triodes b and 7 and the number of turns in the windings 2, 3, 4 n 5.

Auto-oscillations are maintained until a winding pulse is applied to the winding 5 at point 13, the duration of which is equal to or greater than the duration of the generated pulses. First, the capacitor I is charged, after which the current flows through the winding 5 and the resistance //, by installing and holding the core in the state "O". If the core is in the "1" state, the appearance of the quenching pulse will cause the core to re-magnetize to the "O" state, the appearance of a pulse in the collector of triode 6 and the charge of the capacitor 5.

With equal duration of the quenching pulse and the pulse emitted by the generator, at the moment of the quenching pulse and pulse in the collector of triode 6, the capacitors 5 and 9 will begin to discharge through the collector windings and resistances 10 and //. Since the discharge currents of capacitors 8 and 9 are equal, and the core is in the "O" state, it will be kept in this state, since the discharge currents in windings 2 and 5 will be mutually compensated. The capacitors 8 and 9 bits dts, do not cause magnetic core reversal. Therefore, the conditions for the occurrence of self-oscillations will not be fulfilled, and the circuit will stop working before the start of its impulse.

The described controlled ferrite-transistor square pulse generator can be used, for example, as a clock pulse generator and a dynamic trigger operating without clock pulses.

Subject invention

A controlled ferrite-transistor generator of rectangular pulses, distinguished by the fact that, in order to simplify the circuit, it is made on one ferrite core, two counter-connected windings of which contain resistance and a capacitor, are connected in parallel and are connected to the minus of the source at one end food, and others - in the chain of collectors of triodes; the output of one of the windings is used to start the generator, and its input is to break oscillations; the other two core windings included counter-and-earthed emitter-triode base junctions.