SU455485A1 - Device for transmitting constant voltage levels without galvanic communication - Google Patents

Description

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HsoopcTeHLie relates to the field of automation, computing and measuring equipment.

For transmitting stationary levels 1N1 and without galvanic constants, devices are used in which the pulsating transformer is used for uncoupling using the high-frequency repetition generator with an external generator 1pulse01c. The signals from the generator and the input control potential signal are fed to the inputs of a multi-EL1: iteter transistor. When a high level of the input signal and pumping signals are combined, the transFlL1ator goes into a clear state.

However, IB of these devices requires iitani sources in both galvanically separated circuits, structurally combined into one device, and when they are separated, we need additional communication lines, which is associated with additional expenses for M1I when transmitting ianr levels for a long time .

The aim of the invention is to improve the efficiency and noise immunity of the device.

For this, in the proposed device, a feedback coupling and inductive cutter is used (flexible amplification divider, inductance H1) 1M whose resistance is the inductive resistance of the primary winding

transformer, variable from secondary current.

The drawing shows the proposed myMaster.

Rezagstory 1, 2} 3 are connected to the base of the transistor 4, which, through a two-loop driver, on a semiconductor diode 5 III 6, shunts the winding 7 of the pulse transformer 8. The collector power bus

through a resistor 9 is connected to the end of the primary winding 10 of an imimus transformer, the beginning of which is connected to the collector of the transistor) /. The start of the wiring 12 through the resistor -13 is connected to the “base of the transistor 14,

and the end is to the collector power rail. The emitter of the transistor 14 is connected to the midpoint of the divider consisting of a resistor 9 and an inductive resistance of the winding 10 of the pulse transformer 8.

The collector of transistor 14 is connected via a high-frequency converter, consisting of resistors 15 and 16 and e: terminals 17 and 18, to the base of transistor 19, which is connected through resistor 20 with a bias source.

The collector of the transistor 19 is connected through a resistor 21 to the collector power supply bar, and through a cutter 22 to the common power supply bus.

The resistor 23 is connected via capacitor 24 to the base of transistor 11, which through diode 25 is connected to the common spy of the power sources. The winding 7 of the pulse transformer 8 through a half-wave rectifier of positive polarity on semiconductor 1V10D11I; diodes 26 III 27 through-resistor 28 is connected to the base of transistor 4, which is connected to the power of transistor 4 and (INPUT 30. through inputs 29, 32 and 33 are connected to resistors. /, 2 "3, respectively; input 34 of pump signals. Connected to resistor 23; output 35 of the device is connected to the collector of the output trap 19; the capacitor 36 is connected to the base of tr. anzistor.a 14, and the second coicom: to the collector bus, it is iKiKTb 37 oedi "e1na collector bus with power, and the other end - the common bus pntaii sources.

The device works as follows.

When a negative voltage is applied to the input and pumping signals to the input 34, transistor 4 opens and shunts the winding 7 of the pulsed transformer 8 of the ICBCOIM. Malysh internal resistance. At the same time, the modular resistance of the periotic root of rotor 10 is reduced, which leads to the voltage of the collector current of the transistor 11, "the voltage drop across the resistor 9 increases. The potential of the em of the nitter of the transistor 14 decreases. this time, the voltage across the winding 12 decreases and, therefore, the base potential of the transistor 14 increases.

less than the type of emitter potential. m increasing the potential of the base of the transistor 14 with pnp conductivity leads to its closure. At the same time, the potential of the base of the output transistor 19 is reduced, and the transistor 19 recalculate leads IB behind the open state. At this time, a high voltage level is output from the output of the device 35.

Ф: Ilters on resistors / 5 and 16 and capacitances 17 and 18 serve as filter filters for the high-frequency component of the base current of transistor 19.

The high-frequency pump signals are fed to the input 84 and, therefore, to the base traditionally, 77 through the resistor 23 and the capacitance 24, are connected by the transistor 24, amplified by the transistor // and the transformer 8 is driven in a dynamic state.

Flexible feedback voltage taken by 1C two-pole rectifier

on semiconductor diodes 26 and 27, it has a maximal magnitude with the transistor 4 closed and very small with an open one.

The trigger threshold of the device at the input signal is determined by the values and the ratio of the resistors 28 and 29, therefore, it is possible to adjust the pau of the device immunity.

Resistor 22 serves to lower the maximum output level of the device, which is necessary when operating the device on a series 106 TCM.

The capacitance 36 serves to integrate the signals removed from the winding 12, which is necessary for the reliable closure of the transistor M.

The capacitance 37 1 serves to filter the variable component in the collector supply circuit.

Subject invention

Claims (2)

1. A device for transmitting constant voltage levels without galvanic communication, containing a control; which is a transistor, a pulse transformer, a pump transistor, a key, and an output transistor, characterized in that, in order to improve the efficiency and noise immunity of the device, the primary The winding and miouls transformer is connected through a resistor to the power supply bus and forms an inductive-resistor voltage divider, the midpoint of which is connected to the emitter of the key transistor, and the secondary winding of the transistor ormatera via a resistor connected between a power source and schinoy base tra1nzistora key. 2. A device according to claim 1, characterized in that, in order to obtain a threshold. transitional characteristics, the ends of the control winding of the pulse transformer are connected to the diagonal of the input diode, the junction point of the anodes of diodes of the other diagonal is connected through a resistor to the base the control transistor, with the connection point of the diodes, the diodes of this diagonal of the bridge connecting the collector of the control transistor, and the middle point of the control winding of the pulse transformer is connected with the emitter of the control transistor.