SU1417168A1

SU1417168A1 - Three-phase demodulator

Info

Publication number: SU1417168A1
Application number: SU864117193A
Authority: SU
Inventors: Яков Андреевич Литовченко
Original assignee: Я.А.Литовченко
Priority date: 1986-09-10
Filing date: 1986-09-10
Publication date: 1988-08-15

Abstract

Предложена упрощенна схема трехфазного демодул тора, замен юща три обычных и состо ща из одного трансформатора, трех конденсаторов, шести резисторов и шести диодов. В р де случаев трансформатор может быть исключен. Демодул тор применим в преобразовател х угол поворота - напр жение при использовании в качестве датчиков трехфазных сельсинов и феррозовдов. 2 з.п. ф-лы. 3 ил.A simplified three-phase demodulator circuit was proposed, replacing three conventional ones and consisting of one transformer, three capacitors, six resistors, and six diodes. In a number of cases the transformer can be excluded. The demodulator is applicable in converters: angle of rotation — voltage when using three-phase selsins and ferrocores as sensors. 2 hp f-ly. 3 il.

Description

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Изобретение относитс к устройствам дл преобразовани электрических сигналов, в частности дл преобразовани системы трех переменных напр - жений на выходе сельсинных датчиков, феррозондов и т.д. в систему трех взаимосв занных аналоговых напр же- ;The invention relates to devices for converting electrical signals, in particular, for converting a system of three alternating voltages at the output of selsyn sensors, flux probes, etc. into a system of three interconnected analog voltages;

НИИ.SRI.

Цель изобретени упрощение де- модул тора.The purpose of the invention is to simplify a demodulator.

На фиг.1. представлена электрическа схема трехфазного демодул тора; на фиг.2 - график изменени выходных напр жений в зависимости Ът угла поворота датчика; на фиг.З.- схема трехфазного демодул тора, пример вы- пооч е н-ь-г.1. an electrical circuit of a three-phase demodulator is presented; Fig. 2 is a graph of the output voltages versus the angle of rotation of the sensor; on fig.Z. - the scheme of a three-phase demodulator, an example of the highest n-n-g.

Трехфазный демодул тор содержит блок 1 сопр жени с источником опор- ноге напр жени , первый 2, второй 3 И третш 4 разделительные конденсаторы , первый 5. второй 6 и третий 7 диоды коммутации, первый 8, второй 9, третий 10, четвертый 11, п тый 12 и шестой 13 масштабные резисторы, четвертый 14, п тый 15 и шестой 16 диоды коммутации.A three-phase demodulator contains a block 1 for coupling to a source of voltage, the first 2, the second 3, and the third 4 separation capacitors, the first 5. the second 6, and the third 7 switching diodes, the first 8, the second 9, the third 10, the fourth 11, the fifth 12 and sixth 13 scale resistors; the fourth 14, fifth 15 and sixth 16 switching diodes.

Блок 1 сопр жени с источником опорного напр жени может быть выпол нен в виде последовательно соединенных первого конденсатора 17, разв зки первого и второго резисторов 18 и 19 делител и второго конденсатора 20 разв зки.The interfacing unit 1 with the voltage source can be made in the form of serially connected first capacitor 17, isolating the first and second resistors 18 and 19 of the divider and the second capacitor 20 isolating.

Демодул тор функционирует следующим образом.The demodulator operates as follows.

На выходах трехфазного демодул тора устанавливаютс посто нные напр жени , амплитуда которых соответст вует угловому положению датчика.The outputs of the three-phase demodulator are set to constant voltages, the amplitude of which corresponds to the angular position of the sensor.

При повороте датчика выходные напр жени его измен ютс , при этом измен ютс и выходные напр жени трехфазного демодул тора. График измене- НИИ выходных напр жений трехфазного демодул тора в зависимости от угла поворота датчика представлен на фиг.2. Выходное напр жение демодул тора , прин того за прототип, СООТВеТWhen the sensor is rotated, its output voltages change, and the three-phase demodulator output voltages also change. The graph of the change in the III of the output voltages of a three-phase demodulator depending on the angle of rotation of the sensor is presented in Fig.2. The output voltage of the demodulator, adopted for the prototype, is

ствует одному (любому) из графиков, представленных на фиг.2.There is one (any) of the graphs presented in figure 2.

Трансформатор вл етс наименее технологичным элементом схемы и в р де случаев может быть исключен (фиг.З). Здесь гальваническа разв зка схемы трехфазного демодул тора от источника опорного напр жезш .The transformer is the least technological element of the circuit and in a number of cases it can be excluded (Fig. 3). Here, the galvanic isolation of the three-phase demodulator circuit from the source of the reference voltage.

обеспечена с помощью конденсаторов 17 и 20.provided with capacitors 17 and 20.

Claims

1. A three-phase demodulator containing an interface unit with a voltage source, three separation capacitors, the first plates of which are the inputs of the demodulator, six switching diodes and six large-scale resistors, characterized in that, in order to simplify the demodulator, The first output of the interface unit with the voltage source is connected through a serially connected first switching diode and the first large-scale resistor to the second plate of the first coupling capacitor and the first output of the demodulator, cutting the second switching diode and the second large-scale resistor in series with the second plate of the second coupling capacitor, and the second output of the demodulator through the third switching diode connected in series

and the third large-scale resistor - with the second plate of the third coupling capacitor and the third output of the demodulator, the second plates of the first, second and third coupling capacitors are connected respectively via series-connected fourth scale resistor; tfr, and the fourth switching diode connected in series to the fifth fifth resistor and series This switching diode is connected in series with the sixth scale resistor and the sixth switching diode to the second output of the interface block with the reference source tension

2. A demodulator according to claim 1, about tl and - heme | heme, that the interface unit with the source voltage is made in the form of a transformer, the first and second terminals of the secondary winding of which are connected respectively to the first and. the second outputs of the interface unit with the voltage source, and the outputs of the transformer primary winding are connected to the corresponding outputs of the voltage source.

3. The demodulator according to claim 1, which is based on the fact that the interface unit with the source voltage is made in the form of a series-connected first isolation capacitor, a first divider resistor, a second divider resistor, and a second isolation capacitor, moreover, the common output of the first and second resistors of the divider is connected to the zero bus, the first inputs of the first and second

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isolating capacitors are connected respectively to the corresponding outputs of the voltage source, and

- the second plates of the first and second isolation capacitors are connected respectively to the first and second outputs of the interface unit with the source of the reference voltage.

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