Platinum resistor signal acquisition and debugging circuit based on double constant current sources

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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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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