CN-224216188-U - Multichannel thermocouple signal acquisition system

CN224216188UCN 224216188 UCN224216188 UCN 224216188UCN-224216188-U

Abstract

The application discloses a multichannel thermocouple signal acquisition system, which mainly solves the technical problems of higher cost and more complex data summarization processing of the existing temperature measurement system. The multi-channel analog switch module comprises a multi-channel analog switch module with the number of input channels not less than the number of to-be-measured temperature measurement points, a plurality of thermocouples which are correspondingly and respectively electrically connected with corresponding input channels of the multi-channel analog switch module through an amplification compensation module, an analog-to-digital conversion module, a signal isolation module and a controller, wherein the analog-to-digital conversion module, the signal isolation module and the controller are sequentially and electrically connected with the downstream of the output channels of the multi-channel analog switch module, and corresponding output ports of the controller are correspondingly and electrically connected with channel selection ports of the multi-channel analog switch module through the signal isolation module. The problems of multipoint temperature measurement and system expansion are solved through channel time division multiplexing, and the flexibility of the system and the special requirements of modules can be improved.

Inventors

SHANG YU
GUO YUANDONG
CAO YONGQIANG
ZHAO JIALI
YUAN MENGGUANG
DONG XIANG

Assignees

正星科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250520

Claims (7)

1. A multichannel thermocouple signal acquisition system is characterized by comprising a multichannel analog switch module, a plurality of thermocouples, an analog-to-digital conversion module, a signal isolation module and a controller, wherein the number of input channels of the multichannel analog switch module is not less than the number of temperature measurement points to be measured, the thermocouples are correspondingly and respectively electrically connected with corresponding input channels of the multichannel analog switch module through an amplification compensation module, the analog-to-digital conversion module, the signal isolation module and the controller are sequentially and electrically connected with the downstream of an output channel of the multichannel analog switch module, and a corresponding output port of the controller is correspondingly and electrically connected with a channel selection port of the multichannel analog switch module through the signal isolation module.
2. The multi-channel thermocouple signal acquisition system according to claim 1, wherein a resistance-capacitance filter unit for suppressing radio frequency interference is electrically connected between the thermocouple and the amplification compensation module.
3. The multi-channel thermocouple signal acquisition system according to claim 1, wherein the amplification compensation module comprises a thermocouple amplifier provided with a bias voltage input pin, and a bias reference voltage unit which is electrically connected with the bias voltage input pin in a corresponding manner and is used for negative temperature acquisition.
4. The multi-channel thermocouple signal acquisition system according to claim 3, wherein the bias reference voltage unit comprises a voltage reference chip for outputting a bias voltage greater than a reference voltage inside the thermocouple amplifier.
5. The multi-channel thermocouple signal acquisition system according to claim 1, wherein the analog-to-digital conversion module and the signal isolation module are correspondingly in communication connection with each other and the controller through an SPI read data bus.
6. The multi-channel thermocouple signal acquisition system according to claim 1, wherein the output channel of the multi-channel analog switch is correspondingly electrically connected with the input port of the analog-to-digital conversion module through a low-pass filter.
7. The multi-channel thermocouple signal acquisition system according to claim 1, wherein the signal isolation module comprises a control signal isolation unit electrically connected between a corresponding output port of the controller and a channel selection port of the multi-channel analog switch module, and a sampling isolation unit electrically connected between the analog-to-digital conversion module and the controller.

Description

Multichannel thermocouple signal acquisition system Technical Field The application relates to the technical field of temperature monitoring, in particular to a multichannel thermocouple signal acquisition system. Background The technology for generating electricity by reforming methanol generates hydrogen by reacting methanol with steam under the action of a catalyst, and then the hydrogen is utilized to provide power for fuel cell electricity generation. The technology has the advantages of easy storage and transportation of raw materials, high system integration level, higher power generation efficiency and the like, and has application potential in the fields of distributed energy sources, mobile power sources and the like. When the methanol reforming system works, a plurality of measuring points such as an evaporator outlet, a catalyst bed temperature gradient, a heat exchanger cold and hot end and the like are required to be monitored simultaneously so as to ensure the high-efficiency and stable operation of the system. The K-type thermocouple has the advantages of wide temperature measuring range, good stability, lower cost and the like, and is widely applied to temperature monitoring and control in a methanol reforming hydrogen production power generation system. However, the inventor finds that in the process of realizing the technical scheme in the embodiment of the application, the existing technical scheme of adopting a PLC system and a temperature measurement module special for the PLC to carry out the temperature measurement of the methanol reforming system has the problems of larger system volume size and higher cost, meanwhile, due to the fact that different PLC manufacturer modules develop environments and modes, the matching applicability is poor, the summarization and collection of temperature data are not facilitated, and in the technical scheme of adopting a singlechip embedded temperature measurement system to carry out the temperature measurement of the methanol reforming system, a plurality of temperature acquisition terminals are required to carry out multi-point temperature data acquisition, and therefore, the summarization and communication of data of a plurality of acquisition on-off states under the condition are complex. The information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art. Disclosure of Invention In view of at least one of the above technical problems, the present disclosure provides a multichannel thermocouple signal acquisition system, which mainly solves the technical problems of higher cost and more complex data summarization processing of the existing temperature measurement system. According to one aspect of the disclosure, a multichannel thermocouple signal acquisition system is provided, which comprises a multichannel analog switch module with the number of input channels not less than the number of temperature measurement points to be measured, a plurality of thermocouples which are correspondingly and respectively electrically connected with corresponding input channels of the multichannel analog switch module through an amplification compensation module, an analog-to-digital conversion module, a signal isolation module and a controller, wherein the analog-to-digital conversion module, the signal isolation module and the controller are sequentially and electrically connected downstream of an output channel of the multichannel analog switch module, and a corresponding output port of the controller is correspondingly and electrically connected with a channel selection port of the multichannel analog switch module through the signal isolation module. In some embodiments of the disclosure, a resistance-capacitance filter unit for suppressing radio frequency interference is electrically connected between the thermocouple and the amplification compensation module. In some embodiments of the present disclosure, the amplification compensation module includes a thermocouple amplifier provided with a bias voltage input pin, and a bias reference voltage unit electrically connected to the bias voltage input pin in correspondence and used for negative temperature collection. In some embodiments of the present disclosure, the bias reference voltage unit includes a voltage reference chip for outputting a bias voltage greater than a reference voltage inside the thermocouple amplifier. In some embodiments of the present disclosure, the analog-to-digital conversion module and the signal isolation module, and the signal isolation module and the controller are correspondingly in communication connection through an SPI read data bus. In some embodiments of the present disclosure, an output channel of the multi-channel analog switch is electrically con