Multi-channel thermal resistance measuring device and redundant multi-channel thermal resistance measuring device

Abstract

The invention discloses a multi-channel thermal resistance measuring device. The device comprises a test constant current source, a complement constant current source, a mutual exclusion change-over switch group and a plurality of channel circuits; the test constant current source and the position-complementing constant current source are connected to the channel circuit in a mutual exclusion manner through the mutual exclusion change-over switch group; and the channel circuit comprises a working channel circuit and an idle channel circuit, the working channel circuit is powered by using the mutual exclusion change-over switch group through the test constant current source, and the idle channel circuit is powered by using the complement constant current source. According to the invention, the complement constant current source and the test constant current source are switched through the mutual exclusion switch group, so that the charging and discharging process of the capacitor in the circuit is avoided, the current flowing through the thermal resistor to be tested does not jump, the measurement efficiency is greatly improved, and the measurement accuracy is improved at the same time. The invention also provides a redundant multichannel thermal resistance measuring device and temperature measuring equipment with the above beneficial effects.

Description

technical field [0001] The invention relates to the field of process automation, in particular to a multi-channel thermal resistance measuring device, a redundant multi-channel thermal resistance measuring device and temperature measuring equipment. Background technique [0002] In the field of process automation, the efficiency and accuracy of RTD (thermal resistance) measurement has always been the focus in the field. In order to ensure efficiency and save costs, multi-channel thermal resistance measurement devices are often used in the field, that is, a single thermal resistance measurement device includes multiple Channel circuits, each channel circuit is connected to a thermal resistance to be measured, and the multi-channel thermal resistance measuring device sequentially obtains electrical signals of different thermal resistances through different channel circuits according to a preset sequence. However, due to the coupling capacitance in or connected to the thermal r...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a multi-channel thermal resistance measuring device, a redundant multi-channel thermal resistance measuring device and temperature measuring equipment, so as to solve the problem of the jump of current flowing through the thermal resistance in the prior art, and the charging and discharging time of the capacitor in the circuit is too long , the problem of low test efficiency and accuracy

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