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<p>We study the disadvantages of galvanically isolated converters that transmit information through the insulating barrier in the digital or analog form, including the high cost of the components or a&#xa0;conversion error higher than 1%. These galvanically isolated converters are required for the safe operation of the equipment operating at voltages higher than 50 V. We developed a&#xa0;galvanic separator of analog signals that transmits information in the analog form through an insulating barrier without transferring (converting) it into the digital form and has a&#xa0;conversion error of 0.22% at the nominal voltage. This galvanic separator can be included in the composition of various measuring devices, such as converters, sensors, and transceivers of analog signals without transferring the data into the digital form. A&#xa0;method for transmitting analog data signals in the absence of electric connection is investigated, which makes it possible to decrease the error and increase the noise immunity of the converter. The design of the proposed galvanic separator of analog signals is based on the negative feedback whose circuit passes through the modulator, transformer, and demodulator on the primary side. The signal from the output of the demodulator is sent to one of the two inputs of the error amplifier. The error amplifier adjusts the voltages at both inputs in strict agreement with each other, as a&#xa0;result of which the voltage at the output of the demodulator becomes exactly equal to the input voltage supplied to the other input of the error amplifier. The second demodulator is identical to the first demodulator and is mounted on the secondary side. The application of two demodulators makes it possible to perform accurate transmission of the analog signals from the primary side to the secondary side. We manufactured and tested a&#xa0;laboratory sample of the galvanic separator of analog signals. The results of its testing confirms the expediency of application of the negative feedback: the relative conversion error becomes three times lower than for the devices without feedback. Indeed, the relative conversion error of the proposed device within the entire range of input voltages does not exceed 0.7%, whereas for the nominal input value, it is as large as 0.22%. The proposed device can be used as a&#xa0;part of measuring equipment operating at high voltages (more than 10 kV).</p>

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Galvanic isolation of analog signals with improved metrological characteristics

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • E. A. Pecherskaya,
  • D. V. Yakushov

摘要

We study the disadvantages of galvanically isolated converters that transmit information through the insulating barrier in the digital or analog form, including the high cost of the components or a conversion error higher than 1%. These galvanically isolated converters are required for the safe operation of the equipment operating at voltages higher than 50 V. We developed a galvanic separator of analog signals that transmits information in the analog form through an insulating barrier without transferring (converting) it into the digital form and has a conversion error of 0.22% at the nominal voltage. This galvanic separator can be included in the composition of various measuring devices, such as converters, sensors, and transceivers of analog signals without transferring the data into the digital form. A method for transmitting analog data signals in the absence of electric connection is investigated, which makes it possible to decrease the error and increase the noise immunity of the converter. The design of the proposed galvanic separator of analog signals is based on the negative feedback whose circuit passes through the modulator, transformer, and demodulator on the primary side. The signal from the output of the demodulator is sent to one of the two inputs of the error amplifier. The error amplifier adjusts the voltages at both inputs in strict agreement with each other, as a result of which the voltage at the output of the demodulator becomes exactly equal to the input voltage supplied to the other input of the error amplifier. The second demodulator is identical to the first demodulator and is mounted on the secondary side. The application of two demodulators makes it possible to perform accurate transmission of the analog signals from the primary side to the secondary side. We manufactured and tested a laboratory sample of the galvanic separator of analog signals. The results of its testing confirms the expediency of application of the negative feedback: the relative conversion error becomes three times lower than for the devices without feedback. Indeed, the relative conversion error of the proposed device within the entire range of input voltages does not exceed 0.7%, whereas for the nominal input value, it is as large as 0.22%. The proposed device can be used as a part of measuring equipment operating at high voltages (more than 10 kV).