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Shunt monitor integrated circuit (IC) tape moving coil meter

A technology of monitors and instruments, applied in the field of analog circuits

Inactive Publication Date: 2011-03-30
乔璐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for low-level current measurements, the full-scale deflection current exceeds the current to be measured, so a separate power supply is required to power the meter

Method used

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  • Shunt monitor integrated circuit (IC) tape moving coil meter
  • Shunt monitor integrated circuit (IC) tape moving coil meter

Examples

Experimental program
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Effect test

Embodiment Construction

[0007] The present invention converts the inductor input voltage into a current, so that there is no strict functional relationship between the common-mode suppression and the resistance value; when the common-mode voltage is positive, the amplifier A2 is in the working state, and the differential input voltage (VIN+) of Rs-( VIN-) can realize the voltage potential VN and VP at the input terminal of A2; when the common-mode voltage is negative, the amplifier A1 is in the working state, and the differential input voltage (VIN+)-(VIN-) of Rs is converted into the current passing through the 5kΩ resistor; the current The source is a precision current mirror whose output goes directly to RL, where the signal is converted back to a voltage and amplified by the output buffer amplifier.

[0008] The meter can measure current from 0mA-100mA. The full-scale offset current is 15mA. The shunt detector INA193 can detect the voltage drop of the shunt resistor Rs1 (resistance value is 1Ω)....

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PUM

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Abstract

The invention belongs to the field of analog circuits and relates to a shunt monitor integrated circuit (IC) tape moving coil meter. The invention provides a brand new shunt monitor IC tape moving coil meter with unique internal current topology. In the shunt monitor IC tape moving coil meter, inductance input voltage is converted into current, so that a severe functional relationship does not exist between common mode rejection and a resistance value; when the common mode voltage is positive, an amplifier A2 is in a working state and a differential input voltage (VIN+)-(VIN-) of Rs can realize the voltage potential VN and VP of the input end of the A2; when the common mode voltage is negative, an amplifier A1 is in a working state and the differential input voltage (VIN+)-(VIN-) of the Rs is converted into current passing through 5-kilohm resistance; and the source of the current is an accurate current mirror, the input of the current enters RL directly, and a signal is converted into voltage and is amplified by an output buffer amplifier.

Description

Technical field: [0001] The invention belongs to the field of analog circuits, and relates to a shunt monitor IC driving a ring-type instrument. Background technique: [0002] Although analog moving coil meters have less resolution and accuracy than digital reading techniques, they are still the best instrument display technology for tracking reading trends or obtaining information based on changes in measurement data. However, for low-level current measurements, the full-scale deflection current exceeds the current to be measured, so a separate power supply is required to power the meter. Past analog meters have solved this problem by using rechargeable batteries as the meter power source. The combination of manually selectable shunt resistors and high-precision chopper amplifiers enables users to choose from 13 different currents ranging from 1μA to 1A. Invention content: [0003] The present invention aims at the above problems and provides a brand-new shunt monitor I...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 乔璐
Owner 乔璐