A threshold device

 

The invention relates to automatic control and computer engineering and can be used to control the level of a single pulse signals and generating voltage pulses with a given amplitude. The technical result is to increase the efficiency, sensitivity and reliability. The device comprises two transistors (T) (1), (2), a condenser (3), the output pulse transformer (TR) (5), Zener diode (ST) (6), the resistor (7), an additional pulse TR (9), the potential (8) and zero (4) bus signal. The voltage on the secondary boost winding TR (9) opens the transition base-emitter voltage T (2), manifold passage which bypasses the ARTICLE (6), creating a circuit of a galvanic positive feedback for T (1). T (1) and T (2) due to the avalanche-like increase of currents moving in a saturated state. The technical result is achieved due to the sharp decrease of the base current T (2) exceptions to the circuit of the primary winding TP (5) T (2). 1 Il.

The invention relates to automatic control and computer engineering. A threshold device can be used to control the level of a single pulse signals and generating voltage pulses with the set of impulso", C. L. Monin, B. C. Kanavin, published 05.11.73, bull. No. 43), made under the scheme the blocking-oscillator containing a transistor, the collector circuit which includes the primary winding of the pulse transformer, the emitter and base of the transistor through the corresponding resistors are connected to a plus power source, and through the storage capacitor, the base of the transistor is connected to the minus power supply, a Zener diode and a transistor, controlled by the additional winding of the transformer. The disadvantage of this device is low and the stability, reliability and weak immunity.

Known blocking oscillator (see USSR author's certificate No. 527816 from 07.02.75, MKI N 03 To 3/30, "Blocking oscillator", N. P. Moses, G. C. Pavlov, F. F. Parshin, V. T. Straghalis published 05.09.76, bull. No. 33), which is the closest to the technical nature of the claimed device and selected as a prototype. It contains a transistor, the collector circuit which includes the primary winding of the pulse transformer, the emitter and base of the transistor through the corresponding resistors are connected to a plus power source, and through the storage capacitor, the base of the transistor is connected to the minus power supply, Zener diode, included anitelea transistor, the base through the winding of the feedback transformer is connected with the negative pole of the power source.

The disadvantages of this device include loss of voltage on the two transitions collector-emitter primary and secondary transistors, connected in series with the load. (Especially noticeable losses occur at voltages 3-5 sources of signals, typical for circuits computing machinery). In addition, the presence in the schema of the prototype of the parallel transformer voltage feedback is not possible to use it in the conditions leading to degradation of the amplification properties of transistors (low temperature and so on), and leads to additional power consumption in the circuit of the base of the additional transistor.

The problem under consideration is the creation of cost-effective threshold devices operating at low input voltage and degradation of the amplification properties of the transistors.

The technical result is to increase the efficiency, sensitivity and reliability of the threshold device.

This technical result is achieved by the fact that the threshold device comprises two transistors of the same conductivity type, the base and the first through condensate transistor for load matching, connected in series to the Zener diode and the resistor, the first output of which is connected to a potential bus signal source and the second output from the collector of the second transistor connected in parallel with the Zener diode. What's new is that between potential bus signal source and the primary winding of the output pulse transformer included the primary winding of the additional pulse transformer, the secondary winding of which is made increases and in a consistent phase direction is included between the base and emitter of the second transistor, the emitter of which is connected to the base of the first transistor connected to the emitter zero-bus signal source.

This set of features allows you to increase the efficiency, sensitivity and reliability of the threshold device.

The drawing shows a diagram of the threshold device.

The threshold device comprises transistors 1 and 2 of one type conductivity, and the base of the transistor 1 through the condenser 3 is connected to the zero bus 4 signal source, the output of the pulse transformer 5 in the collector circuit of the transistor 1 to align the load, connected in series to the Zener diode 6 and the resistor 7, pillarella with the Zener diode 6. Between potential bus 8 signal source and the primary winding of the output pulse transformer 5 includes the primary winding of the additional pulse transformer 9, the secondary winding of which is made increases and in a consistent phase direction is included between the base and emitter of the transistor 2, the emitter of which is connected to the base of transistor 1 is connected to the emitter of the zero bus 4 signal source.

A threshold device operates as follows.

In the initial state, the circuit is de-energized. When submitting from a source pulse signal to potential bus 8 with respect to the zero bus 4 voltage exceeding the level Zener 6 through the resistor 7 and the diode 6 starts leaking current which charges the capacitor 3 and opens the base junction of transistor 1. In the collector voltage of transistor 1 decreases and the primary windings of the transformers 5 and 9 is applied to the portion of the voltage from the source pulse signal. The voltage on the secondary boost winding of the transformer 9 opens the transition base-emitter voltage of the transistor 2, the collector passage which bypasses the Zener diode 6, creating a circuit of a galvanic positive feedback is go into a saturated state. The voltage potential on the bus, minus the voltage drop on the transition of the collector-emitter of the transistor 1, is applied through the transformer 5 to the load. The voltage drop across the primary winding of the transformer 9 can be neglected, since the voltage base-emitter voltage of the conducting transistor 2 is provided to the winding with a large decrease.

The proposed schematic solution allows to increase the efficiency and sensitivity of the threshold device for the account of:

a sharp decrease of the base current of transistor 2;

- exceptions to the circuit of the primary winding of the output pulse transformer of the second transistor.

Was made a prototype of the threshold device using transistors T and transformers on ferrite cores MNM-17 (C104,5). Higher reliability is confirmed by retention ability test sample by reducing the coefficient of h21ecurrent transfer transistors to 5-10 units.

Claims

A threshold device containing two transistors of one conductivity type, the base and the first through the condenser is connected to the zero bus source si, connected in series to the Zener diode and the resistor, the first output of which is connected to a potential bus signal source and the second output from the collector of the second transistor connected in parallel with the Zener diode, characterized in that between the potential bus signal source and the primary winding of the output pulse transformer included the primary winding of the additional pulse transformer, the secondary winding of which is made increases and in a consistent phase direction is included between the base and emitter of the second transistor, the emitter of which is connected to the base of the first transistor connected to the emitter zero-bus signal source.

 

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