SU660532A1

SU660532A1 - Amplitude detector

Info

Publication number: SU660532A1
Application number: SU731909702A
Authority: SU
Inventors: Т.А. Пунгас; Р.В. Ребане; Х.А. Рейнберг; Т.А. Лауд; Т.Р. Луми
Original assignee: Предприятие П/Я Г-4934
Priority date: 1973-04-23
Filing date: 1973-04-23
Publication date: 1980-11-30

Description

1one

Изобретение относитс к радиоизмерительной технике, а именно к измерени м переменных напр жений, и может использоватьс при построении прецизионных вольтметров, калибровочных генераторов и т.п.The invention relates to a radio measuring technique, namely to measuring alternating voltages, and can be used in the construction of precision voltmeters, calibration generators, and the like.

Одним из известных устройств вл етс устройство детектировани переменных напр жений, состо щее из входного конденсатора, операционного усилител , резистора в цепи измерени , резистора, периодически подключаемого к конденсатору, ключа и делител напр жени , подающего смщение к операционному усилителю р. .One of the known devices is a device for detecting alternating voltages, consisting of an input capacitor, an operational amplifier, a resistor in the measuring circuit, a resistor periodically connected to a capacitor, a switch and a voltage divider, which supplies an operational amplifier p. .

Однако в таком устройстве имеют место наличие переменной составл ющей в детектированном сигнале, а также непосто нство входного сопротивлени устройства вследствие того что нагрузка источника детектируемого сигнсша периодически измен етс .However, in such a device, the presence of a variable component in the detected signal occurs, as well as the inability of the input resistance of the device due to the fact that the load of the source of the detected signal varies periodically.

Наиболее близким техническим решением вл етс амплитудный детектор , содержащий первый операционный усилитель, инвертирующий вход которого соединен с его выходом, а неинвертирующий вход вл етс входом детектора, второй операционный усилитель , между инвертирующим входомThe closest technical solution is an amplitude detector containing the first operational amplifier, the inverting input of which is connected to its output, and the non-inverting input is the detector input, the second operational amplifier, between the inverting input

которого и выходом первого операционного усилител включена последовательна RC -цепь, а также включенные противофазно по управл 10 цемуof which the output of the first operational amplifier is connected in series with an RC circuit, as well as those connected in antiphase in control 10

сигналу два , например, на диодах , входы которых объединены и через конденсатор подключены к выходу второго операционного усилител ,при этом выход одного ключа через резистор соединен с общей шиной, а выход другого ключа подключен к месту соединени конденсатора и резистора последовательной RC -цепи 2. Однако в амплитудном детектореSignal two, for example, on diodes whose inputs are combined and connected via a capacitor to the output of a second opamp, the output of one key through a resistor connected to the common bus, and the output of the other key connected to the junction of the capacitor and the resistor of the RC circuit 2. However, in the amplitude detector

нельз добитьс равенства посто нных продетектированных напр жений при детектировании двух колебаний равных эффективных значений, но с разными формами кривой.It is impossible to achieve equality of the constant detected stresses when detecting two oscillations of equal effective values, but with different forms of the curve.

Целью изобретени вл етс повышение точности детектировани колебаний несинусоидсшьной фортчы.The aim of the invention is to improve the accuracy of the detection of vibrations of a non-sinusoidal forty.

Дл этого в амплитудном детекторе, содержащем первый операционный усилитель , инвертирующий вход которого соединен с его выходом, а неинвертирующий ВХ.ОД вл етс входом детектора второй операционный усилитель, между инвертирующим входом которого и вы- To do this, in the amplitude detector containing the first operational amplifier, the inverting input of which is connected to its output, and the non-inverting I / O.OUT is the detector's input to the second operational amplifier, between which the inverting input

Claims

During the first operational amplifier, the RC circuit is connected in series, as well as two keys connected in anti-phase on the control signal, for example, on diodes whose inputs are combined and connected to the output of the second operational amplifier via a capacitor, while the output of one key is connected to the common bus and the output of the other switch are connected to the connection method of the capacitor and the resistor of the RC circuit; between the outputs of the keys, a resistor is turned on (pp. The drawing shows the electrical circuit of the amplitude detector Amplitude detector contains the first operational amplifier 1, the inverting input of which is connected to its output, and the non-inverting input is the detector input, the second operational amplifier 2, between which the input of the dynamic input and the output of the first operational amplifier 1 is connected a serial RG-circuit consisting of a resistor 3 and a capacitor 4 as well as two switches 5 and b connected in antiphase by a control signal, for example, on diodes whose inputs are combined and connected via a capacitor 7 to the output of the second operationally the amplifier 2, while the output of the key 6 through a resistor 8 is connected to the common bus, and the output of the key 5 is connected to the junction of the capacitor 4 and the resistor 3 of the serial RC circuit, between the outputs of the keys 5,6 includes a resistor 9, a non-inverting input of the operational amplifier 2 is connected to a common bus. The detector works as follows. The output of the operational amplifier (OU) 1 repeats the detected alternating voltage Ugx at the input of the OU 2 there is a small alternating voltage of error 6 (. In the resistor 3, an alternating, detected current flowing into the detector node is created due to the influence of the voltage difference Ugx OU 2. In the steady-state mode, the average values of the currents through the diodes of the keys 5 and b are equal. The capacitor 7 is charged so that the diode of the key 5 conducts more than half a period in order to balance the current of the diode of key 6 (resistor 8 bypasses the resistor 9 feedback calling the corresponding increase in the average value of the current pulses of the switch diode 6); Since the average value of the input current is zero and the current through the diode of key 6 exceeds the current of reverse polarity through resistor 9 (current pulses of the diode of key 6 through resistor 8), the balancing current flowing to the common bus and to the output of the op-amp 1. At a common point of resistors 3, 9 and capacitor 4 a constant output voltage is created, the value of which can vary from zero to peak value. It is also possible to choose such a ratio of the resistances of the resistors 3.9 and 8 so that the detected voltage is the same. For two signals of different shape, but equal to the effective value. In this case, the value of the variable component from the output voltage is negligible. The absence of a smoothing filter in the detector, as well as the possibility of changing the ratio of resistances, to ensure the detection of different sections of the curve makes it possible to implement universal, cheap, low-cost. baritone detectors. Amplitude detector comprising a first operational amplifier, and a rotating input of which is connected to its output, and a non-inverting input is the input of a detector, a second operational amplifier, between the inverting input of which and the output of the first operational amplifier is switched on the RC.chain and also included two keys, for example, on diodes, whose inputs are combined and connected via a capacitor to the output of the second operational amplifier, with one output of the key through a resistor connected to the common bus, and the output of another switch is connected to the junction of a capacitor and a resistor RC serial -chain, characterized in that, in order to increase the accuracy of detecting non-sinusoidal oscillation, a resistor connected between the outputs of keys. Sources of information taken into account in the examination 1. US patent 3,783,381, cl. 324-132,1971.

2. For the number 1774189/09, cl. H 03 D 1/18, 02.02.72, according to which approval of the issue of the author's certificate.