A platinum resistance signal acquisition and debugging circuit based on dual constant current sources

A technology for debugging circuits and collecting circuits, applied in the aviation electrical field, can solve the problems of complex circuit debugging, and achieve the effect of reducing scale, volume and weight

Active Publication Date: 2019-11-15
天津航空机电有限公司
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Problems solved by technology

[0002] The controller of the environmental control system on the aircraft needs to collect a large number of platinum resistance temperature signals as the control basis. The current constant current source platinum resistance signal acquisition circuit needs to collect multiple RPt resistance sensor signals at the same time, and the multi-channel RPt resistance sensor collects range signals. When different, it is necessary to design a corresponding AD conversion circuit for the acquisition range of each RPt resistance sensor; if the above-mentioned multiple RPt resistance sensors with different acquisition ranges use the same AD conversion circuit, it is necessary to sacrifice the signal of the RPt resistance sensor with a smaller acquisition range resolution, and the circuit debugging is more complicated

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  • A platinum resistance signal acquisition and debugging circuit based on dual constant current sources
  • A platinum resistance signal acquisition and debugging circuit based on dual constant current sources

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Embodiment Construction

[0015] The present invention specifically includes a platinum resistor signal acquisition and debugging circuit based on dual constant current sources, using the same voltage regulator tube D1 to form a stable 2.5V voltage to supply power to two operational amplifiers, and selecting the same current limiting resistor to form an equal current constant current source, The A-way constant current source supplies power to the RPt resistance sensor, and converts the sensor resistance change into a voltage signal; the B-way constant current source adjusts the resistance value according to the signal acquisition range of the RPt resistance sensor and the analog quantity sampling range of the A / D conversion circuit. It can realize fast, accurate and reliable acquisition and debugging of the RPt resistance sensor acquisition circuit.

[0016] In the platinum resistor signal acquisition and debugging circuit, connect pin 4 of the operational amplifier M1 to the ground, pin 8 to the 15V po...

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Abstract

The invention relates to a platinum resistor signal acquisition and debugging circuit based on double constant current sources. The platinum resistor signal acquisition and debugging circuit includesa constant current source acquisition circuit and a constant current source debugging circuit; the constant current source acquisition circuit provides power for an RPt resistance transducer, and converts resistance value changes of the RPt resistance transducer into voltage signals; the resistance value of an adjusting resistor of the constant current source debugging circuit is set as an intermediate resistance value within the signal acquisition range of the RPt resistance transducer, so that a signal reference voltage value of the RPt resistance transducer is formed, and voltage differencesignals between an output end voltage value of the RPt resistance transducer and the reference voltage value of the RPt resistance transducer. The circuit has the advantages of a high resolution ratio, reliable signal acquisition, simple circuit debugging and the like.

Description

technical field [0001] The invention belongs to the field of aviation electrical technology, and relates to a platinum resistance signal acquisition and debugging circuit based on double constant current sources. Background technique [0002] The controller of the environmental control system on the aircraft needs to collect a large number of platinum resistance temperature signals as the control basis. The current constant current source platinum resistance signal acquisition circuit needs to collect multiple RPt resistance sensor signals at the same time, and the multi-channel RPt resistance sensor collects range signals. When different, it is necessary to design a corresponding AD conversion circuit for the acquisition range of each RPt resistance sensor; if the above-mentioned multiple RPt resistance sensors with different acquisition ranges use the same AD conversion circuit, it is necessary to sacrifice the signal of the RPt resistance sensor with a smaller acquisition ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/567G01K7/18
CPCG01K7/18G05F1/567
Inventor 王清泉秦余贞耿新宇李彦
Owner 天津航空机电有限公司
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