SU951162A1

SU951162A1 - Method of indicating current direction or voltage polarity

Info

Publication number: SU951162A1
Application number: SU802941154A
Authority: SU
Inventors: Сергей Сергеевич Рочев
Original assignee: Предприятие П/Я В-8729
Priority date: 1980-06-19
Filing date: 1980-06-19
Publication date: 1982-08-15

Description

1one

Изобретение относитс к измерительной технике и может быть использовано в устройствах управлени цифровых систем в зависимости от знака разности измер емого и компенсирующего сигналов.The invention relates to a measurement technique and can be used in control devices of digital systems depending on the sign of the difference between the measured and compensating signals.

Известен способ индикации направлени тока или пол рности напр жени , в котором входной сигнал, ток или напр жение, вл ющийс разностью измер емого и компенсирующего сигналов, непосредственно воздействует на регенеративный элемент (например, ждущий блокинг-генератор), на выходе которого по вл етс сери импульсов 1.A known method of indicating the direction of a current or polarity of a voltage, in which an input signal, a current or voltage, which is the difference of the measured and compensating signals, directly affects the regenerative element (for example, a waiting blocking generator), at the output of which pulse train 1.

Недостатки способа - низкие стабильность и чувствительность.The disadvantages of the method are low stability and sensitivity.

Наиболее близким решением к данному изобретению вл етс способ индикации направлени тока или пол рности напр жени путем воздействи тока или напр жени на регенерированный элемент, охваченный положительной обратной св зью 2.The closest solution to this invention is to indicate the direction of the current or polarity of a voltage by applying a current or voltage to a regenerated element covered by a positive feedback 2.

Недостатками способа вл ютс низкие стабильность и чувствительность, обусловленные наличием нелинейной обратной св зи.The disadvantages of the method are low stability and sensitivity due to the presence of non-linear feedback.

Цель изобретени - повышение чувствительности и стабильности.The purpose of the invention is to increase the sensitivity and stability.

Поставленна цель достигаетс тем, что в способе индикации направлени тока или пол рности напр жени путем воздействи на регенеративный элемент и индикации направлени входного тока или пЬл рности напр жени по уровню выходного сигнала регенеративного элемента, последний устанавливают в положение нeyctoйчивoгo равновеси . При этом установку регенеративного элемента в положение неустойчивого равновеси производ т путем временного прекращени действи положительной обратной св зи.The goal is achieved by the fact that in the method of indicating the direction of current or polarity of a voltage by acting on the regenerative element and indicating the direction of the input current or voltage of the regenerative element, the latter is set to a position of unbalanced. In this case, the regenerative element is set to an unstable equilibrium position by temporarily ceasing the effect of positive feedback.

Сущность способа заключаетс в следующем .The essence of the method is as follows.

Claims

The input signal, current or voltage, which is the difference of two signals, reflecting the measured and compensating value, affects the regenerative element at the moment when it is in a state of unstable equilibrium and can. to make free movement from latency to one of the stable areas due to a deistvivAt positive feedback. In this case, the direction of the input current (or voltage polarity) depends on which of the stable areas the regenerative element moves, and the indication of the direction of the input current or polarity of the voltage occurs after the end of the regenerative transition by the output signal level. FIG. 1 is a block diagram of a device for indicating a current direction or voltage polarity; in fig. 2 - characteristics of the regenerative element. The device for indicating the direction of the current or polarity of the voltage contains an amplifier 1. Direct current with a non-inverting input (regenerative element) and analog switches 2 and 3. An analog switch 2 switches the output and input of the amplifier (closes a positive feedback circuit) analog switch 3 connects the input signal Ug to the input of amplifier 1. In FIG. 2a shows the static characteristic of an amplifier 1 with an open circuit of positive feedback (key 2 is open), where point C corresponds to the middle of the linear portion of the static characteristic of the amplifier in the absence of an input signal (key 3 is open). When the key 2 is closed, the circuit (amplifier 1 and key 2) acquires regenerative properties and at the first moment of time is in a state of unstable equilibrium (point C in Fig. 26). At the same time, switch 3 briefly closes, for example, the input voltage Ugx. reinforced by amplifier 1, briefly shifts the point on the characteristic (Fig. 26) to the right or left of point C, depending on the sign of Ugx b (this is an avalanche-like process of switching amplifier 1 to one of the stable regions (points A and 8 in Fig. 26). About the sign of the input voltage Upx, or current is judged by what kind of stable areas A or B (Fig. 26) passed to amplifier 1. To re-indicate, it is necessary to unlock and re-close key 2 and simultaneously with 24 short circuit of key 2 shortly close the key 3. The short duration of the lock key 3 is required d The moment of time when the switch 2 is open can be used to correct the zero of the amplifier I. This method of indicating the voltage or polarity of the voltage has a higher, higher stability and sensitivity than the known method, due to that, in the unstable equilibrium region, the regenerative element (amplifier) operates in a linear gain mode with a maximum transmission coefficient, and also because a small deviation of the output voltage under de styiem input voltage allows the amplifier circuit with a closed positive feedback to move at a certain steady state. In addition, in this method there is no danger of self-excitation of the regenerative element. Claim 1. The method of indicating the direction of current or polarity of a voltage by acting on a regenerative element and indicating the direction of the input current or polarity of a voltage according to the output level of a regenerative element, is distinguished by the fact that, in order to increase stability and sensitivity, the regenerative element is set in a position of unstable equilibrium. 2. The method according to claim 1, wherein the regenerative element is set to an unstable equilibrium position by temporarily ceasing the effect of positive feedback. Sources of information taken into account in the examination 1. Handbook of electronic devices. Ed., Linde D. P. M., Energie, 1978, Vol. 1, p. 373.

2. Shln. V. M. Digital transducers and devices. Higher ITCOLA, M., 1973, p. 102-104.

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