SU1241436A1 - Unipolar signal-to-bipolar signal converter - Google Patents

Abstract

The invention relates to a pulse technique. It can be used in automation and remote control devices. The purpose of the invention — improving noise immunity — is achieved by galvanically isolating sources of unipolar and bipolar signals. For this, two optocouplers 5 and 6 and a logic element 1 AND, which is the clock input of the converter, are introduced into the converter. In addition, the converter contains clock input 2, information input 3, resistors 4 and 8, source 7 of unipolar signals, source 9 of bipolar signals, transistors 10 and 11. At the same time, source 7 is galvanically developed from source 9, which provides reliability, noise immunity and versatility of the device while maintaining a high conversion frequency range. Interference in the load of the amplifier when switching high-power bipolar pulses does not pass through the power buses and to the input of the device. 1 il. o (lu 4 St SB O5 .J

Description

one

The invention relates to a pulse technique and can be used in automation and telemechanics.

The purpose of the invention is to increase the noise immunity by galvanic uncoupling of sources of unipolar and bipolar signals.

The drawing shows a circuit diagram of a converter of unipolar to bipolar signals. .

The converter of unipolar signals to bipolar contains an element And 1, a clock input 2 of the converter, information input 3, a limiting resistor 4, optocouplers 5 and 6, a source of 7 unipolar signals, a limiting resistor 8, a source of 9 bipolar signals, an amplifying cascade on a transistor 10, the transistor 11.

Clock signals are sent to the first input of the I 1 element, information signals are sent to the second input of the I 1 element, and the output of the I 1 element is connected via a limiting resistor 4 to the common output of optocouplers 5 and 6, the second signals of which are connected respectively to the source 7 and to the input 2, the third viewpoints of optocouplers 5 and 6 are connected to each other and through a limiting resistor 8 to the source 9, the fourth output of the optocoupler 5 is connected to the base of the transistor 10, the emitter of which is connected to the collector of the transistor 11, the base of which is connected to the fourth view of the optro at 6, the emitter of transistor 11 is connected to source 9.

Converter unipolar signals in. Bipolar works as follows.

Upon receipt of positive pulses at inputs 2 and 3, corresponding to logical 1, logical 1 is formed at the output of element I 1, preventing current from flowing through the LEDs of optocouplers 5 and 6. At the same time, transistors 10 and 11 are clamped and a high potential is formed at the output of the amplifier circuit.

When a potential corresponding to logical O and input 2 of a positive TiiKTOBoro pulse corresponding to logical 1 arrives at input 3, a low potential is formed at the output of the element I 1, a high potential at the anode of the LED of the optocoupler 6

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Tronov 5 and 6, a current flows, both transistors 10 and 11 are open and at the output of transistor 10 a low potential is formed.

c When a zero potential of clock I1chpulsov at the output of the element And 1, on the cathodes of the LEDs of the optocouplers 5 and 6, the potential of the logic O is formed.

10 LED optocoupler 5 is open, the optocoupler. 6 is closed, an intermediate potential is formed at the output of the amplifier stage.

The duration of the formed weekend

15 pulses corresponds to the duration of the clock pulses and can vary -. c in a wide range simultaneously with a change in the frequency of clock pulses. At the same time, the source 7 of the galvanic is developed with the source of 9 bipolar strings, while providing the advantages of electrically unconnected sources, i.e. reliability, noise immunity and versatility

25 applications while maintaining a high frequency range of the REPRODUCTION. Therefore, interference arising in the load (for example, in the recorder electromagnet winding) of an amplifier with co-operation of high-power bipolar pulses does not pass through the power buses to the information signal circuit and to the device input. This eliminates the effect of interference on the relatively low levels of operation of the logic elements of the information and clock generation circuit.

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Claims (1)

Invention Formula A converter of unipolar signals into bipolar, containing an amplifying cascade on the first transistor connected according to a common emitter circuit, and a second transistor, which is characterized by the fact that, in order to increase the noise immunity, two element I is connected to the common output of the first and second optocouplers, the second terminals of which are connected respectively to the positive pole of the source of unipolar signals and the input of the element I, which is the clock input of the converter, the second input of the elements This AND is the information input of the converter, the third transducers of the first and second optocouplers are connected, respectively, 312414364 but with the bases of the first and second trans-signals, the second pole of which is connected to the transmitter, the collector of the second transistor is with the fourth transistor of the first torus - with the emitter of the first transistor and second opto-switches, the output of the amplifier, the emitter of the second transistor - from the cascade is the output of a single pole source of a bipolar 5 generator.