Pressure sensor line disconnection detection circuit
A pressure sensor and disconnection detection technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of not being able to know the abnormal use of equipment, abnormal production, and inaccurate pressure feedback of instruments, so as to solve production abnormalities, Simple structure and strong practicability
Pending Publication Date: 2021-08-27
SHENZHEN STRONG TECH
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Problems solved by technology
[0003] If the pressure sensor is connected to the excitation source line of the pressure detection instrument, or any one of the four lines such as the signal line is disconnected during use, the instrument will not be able to accurately feedback the actual pressure, and the user will not be able to get it immediately. Knowing the abnormal use of equipment, resulting in abnormal production, needs to be improved
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[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0022] see figure 1 , a pressure sensor disconnection detection circuit, comprising:
[0023] Breakpoint module, used to connect voltage input and transmit voltage signal;
[0024] A dual-channel operational amplifier module is used to ensure the stability of the signal level output to the switch module;
[0025] A switch module, used for circuit conduction;
[0026] The processing module is used to judge whether the four signal wires of the ...
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The invention discloses a pressure sensor line disconnection detection circuit and belongs to the field of detection circuits. The pressure sensor line disconnection detection circuit comprises a line disconnection point module used for connecting voltage input and transmitting voltage signals, a two-way operational amplifier module which is used for ensuring that signal level output to a switch module is stable, the switch module which is used for switching on a circuit, and a processing module which is used for judging whether four signal lines of a pressure sensor are disconnected or not and identifying the disconnected line. According to the pressure sensor line disconnection detection circuit, the voltage values of signal line connection points in strain gauge pressure sensors connected in a full-bridge mode, so that the line disconnection positions of the strain gauge pressure sensors are determined. The circuit is simple in structure and high in practicability. Production abnormity caused by sensor line disconnection in the production process can be solved, and potential safety hazards can be found in time in some applications.
Description
technical field [0001] The invention relates to the field of detection circuits, in particular to a pressure sensor disconnection detection circuit. Background technique [0002] Strain gauge pressure sensors work on the principle of resistance strain effect. When the resistance strain gauge is deformed due to pulling up or compression, its resistance value will change. The internal bridge resistance structure will cause the asymmetry of the bridge arm due to the change of the resistance of the strain arm to obtain the corresponding millivolt-level small signal voltage output. This small signal voltage is connected to the The special pressure detection instrument is converted into the corresponding pressure value. [0003] If the pressure sensor is connected to the excitation source line of the pressure detection instrument, or any one of the four lines such as the signal line is disconnected during use, the instrument will not be able to accurately feedback the actual pres...
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IPC IPC(8): G01R31/54G01R31/00
CPCG01R31/54G01R31/00
Inventor 李有根余志峰罗永民
Owner SHENZHEN STRONG TECH