Voltage and current mode composite MFC analog feedback circuit

By designing a voltage-current mode composite MFC analog feedback circuit, using short contacts to adjust the current size or voltage size, the problems of high component usage and PCB cost in the prior art are solved, and high-precision and stable current output are achieved.

CN119717983AInactive Publication Date: 2025-03-28CHARODEN IND TECH (SHANGHAI) CO LTD
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Patent Information

Application Number
CN202510213189.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-26
Publication Date
2025-03-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

When the existing MFC analog feedback circuit realizes 4-20mA or 0-5V output, it occupies too much PCB space, increasing component cost and board cost. At the same time, special attention should be paid to the power supply design and program configuration, otherwise it may lead to unstable or inaccurate output.

Method used

A voltage-current mode composite MFC analog feedback circuit is designed to shorten the third short contact or shorten the first short contact and the second short contact to adjust the current size or voltage size, reduce component usage and PCB cost, and use high-precision resistance sampling and current limiting resistor protection.

Benefits of technology

High-precision 4-20mA or 0-5V outputs in a smaller PCB space are achieved, reducing component and board costs, while improving the accuracy of current output and the stability of driving current.

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Abstract

The invention discloses a voltage and current mode composite MFC analog feedback circuit which comprises an operational amplifier and a resistance network, one end of a first resistor is connected with an input voltage UIN, the other end of the first resistor is connected with the operational amplifier, one end of a second resistor is connected with the operational amplifier, the other end of the second resistor is connected with a power voltage VCC, one end of a third resistor is connected with the operational amplifier, and the other end of the third resistor is connected with the operational amplifier. One end of the fourth resistor is connected with the operational amplifier, the other end of the fourth resistor is connected with the fifth resistor, the other end of the fifth resistor is connected with the output voltage UOUT, the first short circuit point is connected with the second resistor in series, the second short circuit point is connected with the fifth resistor in parallel, and the third short circuit point is connected with the fourth resistor in series. The required current is obtained when current output is adopted by short-circuiting the third short-circuiting point, or the required voltage is obtained when voltage output is adopted by short-circuiting the first short-circuiting point and the second short-circuiting point at the same time.
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