RU2012134855A

RU2012134855A - DC SENSOR WITH ISOLATION

Info

Publication number: RU2012134855A
Application number: RU2012134855/28A
Authority: RU
Inventors: Павел Васильевич Михеев; Екатерина Павловна Кузуб
Original assignee: Открытое акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнева"
Priority date: 2012-08-14
Filing date: 2012-08-14
Publication date: 2014-02-20
Also published as: RU2528270C2

Abstract

Датчик постоянного тока с развязкой, содержащий измерительный шунт, первый вывод которого подключен к общей шине питания, а второй - к нагрузке, операционный усилитель (ОУ), четырехобмоточный трансформатор, первая обмотка которого через первый диод подключена ко входу первого фильтра, выход которого является выходом устройства, вторая обмотка трансформатора через второй диод подключена ко входу второго фильтра, отличающийся тем, что положительный вывод питания ОУ подключен к плюсовой шине питания, а отрицательный - к общей шине питания; введены два резистивных делителя напряжения с равными коэффициентами деления; первый делитель включен между плюсовой шиной питания и вторым выводом шунта, а второй - между плюсовой шиной питания и общей шиной; инвертирующий вход ОУ подключен к выходу первого делителя, а неинвертирующий - к выходу второго делителя; положительный выход второго фильтра через введенный резистор подключен к неинвертирующему входу ОУ, а отрицательный - к инвертирующему входу ОУ; введен конденсатор, который включен между выходом и инвертирующим входом ОУ; введен p-n-p транзистор, эмиттер которого подключен к первому выводу шунта, база через резистор - к выходу ОУ, а коллектор - к входу введенного RC-фильтра; выход RC-фильтра подключен к шинам питания блокинг-генератора, собранного с использованием третьей и четвертой обмотки трансформатора и вновь введенных диода, двух резисторов, конденсатора и транзистора.Isolated DC sensor, containing a measuring shunt, the first output of which is connected to a common power bus, and the second to the load, an operational amplifier (OA), a four-winding transformer, the first winding of which is connected through the first diode to the input of the first filter, the output of which is the output devices, the second winding of the transformer through the second diode is connected to the input of the second filter, characterized in that the positive output of the op-amp power supply is connected to the plus power bus, and the negative one to the common power bus; two resistive voltage dividers with equal division factors were introduced; the first divider is connected between the positive power bus and the second terminal of the shunt, and the second between the positive power bus and the common bus; the inverting input of the op-amp is connected to the output of the first divider, and the non-inverting input to the output of the second divider; the positive output of the second filter through the introduced resistor is connected to the non-inverting input of the op-amp, and the negative is connected to the inverting input of the op-amp; a capacitor is introduced, which is connected between the output and the inverting input of the op-amp; a p-n-p transistor is introduced, the emitter of which is connected to the first output of the shunt, the base through the resistor to the output of the op-amp, and the collector to the input of the inserted RC filter; the output of the RC filter is connected to the power buses of the blocking generator assembled using the third and fourth windings of the transformer and the newly introduced diode, two resistors, a capacitor and a transistor.

Claims

Isolated DC sensor, containing a measuring shunt, the first output of which is connected to a common power bus, and the second to the load, an operational amplifier (OA), a four-winding transformer, the first winding of which is connected through the first diode to the input of the first filter, the output of which is the output devices, the second winding of the transformer through the second diode is connected to the input of the second filter, characterized in that the positive output of the op-amp power supply is connected to the plus power bus, and the negative one to the common power bus; two resistive voltage dividers with equal division factors were introduced; the first divider is connected between the positive power bus and the second terminal of the shunt, and the second between the positive power bus and the common bus; the inverting input of the op-amp is connected to the output of the first divider, and the non-inverting input to the output of the second divider; the positive output of the second filter through the introduced resistor is connected to the non-inverting input of the op-amp, and the negative is connected to the inverting input of the op-amp; a capacitor is introduced, which is connected between the output and the inverting input of the op-amp; a p-n-p transistor is introduced, the emitter of which is connected to the first output of the shunt, the base through the resistor to the output of the op-amp, and the collector to the input of the inserted RC filter; the output of the RC filter is connected to the power buses of the blocking generator assembled using the third and fourth windings of the transformer and the newly introduced diode, two resistors, a capacitor and a transistor.