SU932523A1

SU932523A1 - Device for monitoring input signal amplitude

Info

Publication number: SU932523A1
Application number: SU792831535A
Authority: SU
Inventors: Владимир Ильич Турченков
Original assignee: За витель
Priority date: 1979-10-11
Filing date: 1979-10-11
Publication date: 1982-05-30

Description

Изобретение относится к автоматике и может быть использовано в устройствах для контроля технологических процессов, а также в устройствах для тревожной и пожарной сигнализации.The invention relates to automation and can be used in devices for monitoring technological processes, as well as in devices for alarm and fire alarms.

Известно устройство для контроля амплитуды входного сигнала, содержащее измерительный мост, к выходной диагонали которого подключены два элемента сравнения (1).A device is known for controlling the amplitude of an input signal, comprising a measuring bridge, to the output diagonal of which two comparison elements are connected (1).

Наиболее близким к предлагаемому является устройство для контроля амплитуды входного сигнала, содержащее два транзистора одного типа проводимости, эмиттеры которых объединены, база второго транзистора подключена к коллектору первого транзистора, соединенного через резистор с источником питания [2].Closest to the proposed device is to control the amplitude of the input signal, containing two transistors of the same conductivity type, the emitters of which are combined, the base of the second transistor is connected to the collector of the first transistor connected through a resistor to a power source [2].

Недостатком этих устройств является невозможность раздельного контроля амплитуды разнополярных сигналов.The disadvantage of these devices is the impossibility of separate control of the amplitude of bipolar signals.

Цель изобретения - обеспечение раздельного контроля амплитуды разнополярных сигналов, что расширяет функциональные возможности устройства .The purpose of the invention is the provision of separate control of the amplitude of bipolar signals, which extends the functionality of the device.

Поставленная цель достигается тем, что в устройство для контроля амплитуды входного сигнала, содер- жащее два транзистора одного типа проводимости, эмиттеры которых объе- динены, база второго транзистора подключена к коллектору первого транзистора, соединенного через резистор с источником питания, введены три диода, два контрольных резис. „ тора и источник знакопеременного напряжения, база первого транзистора и средняя точка источника знакопеременного напряжения соединены с общей шиной устройства, которая соединена с эмиттером первого транзистора че15 рез первый диод, коллектор второго транзистора через последовательно включенные второй диод н первый контрольный резистор подключен к одной клемме источника знакопеременно20 го напряжения, а через последовательно включенные третий диод и второй контрольный резистор - к его второй клемме, входная клемма устройства подключена к эмиттерам тран25 зисторов.This goal is achieved by the fact that in the device for controlling the amplitude of the input signal containing two transistors of the same conductivity type, the emitters of which are combined, the base of the second transistor is connected to the collector of the first transistor connected through a resistor to a power source, three diodes, two control res. The torus and the alternating voltage source, the base of the first transistor and the midpoint of the alternating voltage source are connected to the common bus of the device, which is connected to the emitter of the first transistor through the first diode, the collector of the second transistor through the second diode connected in series and the first control resistor is connected to one source terminal alternating voltage, and through a series-connected third diode and second control resistor to its second terminal, the input terminal of the device is connected ene to the emitters tran25 ican.

На чертеже показана принципиальная схема предлагаемого устройства.The drawing shows a schematic diagram of the proposed device.

Устройство содержит контролируемый источник 1 тока, источник 2 зна30 копеременного напряжения, первыйThe device contains a controlled current source 1, source 2 alternating voltage sign 30, the first

Claims

The claims are open until

9, a prosthesis transistor 3, a second transistor 4, a first diode 5, a second diode b, a third diode 7, a resistor 8, a power supply 9, a first control resistor 10, a second control resistor 11, output terminals 12 and 13.

The device operates as follows.

When the current source 1 current ^ is less than the threshold value, the first transistor 3 is the current saturation of the penitent source through resistor 8.

The voltage of the voltage source 2 alternately opens the diodes b and 7. Since the first transistor 3 is open, the voltage at the outputs 12 and 13 is small.

When increasing the current of the current source 1 to the threshold, the first transistor 3 jumps shut and the second transistor 4 opens to saturation. The voltage at the collector of transistor 4 rises and an output signal is generated at the corresponding output 12 or 13.

Changing the voltage amplitude from source 2 changes the thresholds of the device. If the current source 1 introduces a current of variable polarity, then with one phase of this current the signal will be on one output terminal, and with another phase - on the other output terminal of the device.

Thus, the proposed device provides separate control of the amplitude of bipolar signals.

A device for controlling the amplitude of the input signal, containing two transistors of the same type of conductivity, the emitters of which are combined, the base of the second transistor is connected to the collector of the first transistor connected through a resistor to a power source, characterized in that, in order to provide separate control of the amplitude of bipolar signals into it introduced three diodes, two control resistors and a source of alternating voltage, the base of the first transistor and the midpoint of the source of alternating voltage are connected to the bus of the device, which is connected to the emitter of the first transistor through the first diode, the collector of the second transistor is connected through a second diode and a first control resistor to a single alternating voltage source terminal, and through a third diode and a second control resistor connected in series to its second terminal, the input terminal of the device is connected to the emitters of transistors.