Resistance/capacitance measuring method and device thereof

Abstract

The invention relates to a resistance / capacitance measuring method and device thereof. The device comprises a multi-path serial resistor-capacitor module, a multi-path serial resistor-capacitor selection module, a resistor / capacitor-period conversion module and an N period time detection module, and is characterized in that: the multi-path serial resistor-capacitor module serially connects a resistor or capacitor to be detected with a corresponding determined capacitor or resistor; the multi-path serial resistor-capacitor selection module selects a line to be detected in the multi-path serial resistor-capacitor module; the resistor / capacitor-period conversion module converts the resistance-capacitance value of the selected line into a continuous pulse with period corresponding to the resistance-capacitance value and realizes power supply or capacitor charge / discharge control on the multi-path serial resistor-capacitor module; and the N period time detection module is used for detecting the time of N periods of the continuous pulse output by the resistor / capacitor-period conversion module. The device provided by the invention has very simple circuit and low cost, is widely applicable, and can shorten the sampling time by 1-2 orders of magnitude relative to a frequency conversion type circuit.

Description

technical field [0001] The invention relates to a resistance-capacitance measuring method and a device thereof, which are applied in the fields of industrial control and instrumentation, especially resistance-type or capacitance-type transmitters for industrial process control. Background technique [0002] Resistive or capacitive transmitters are widely used in the field of industrial process control. In recent years, with the development of microprocessor and single-chip microcomputer (MCU) technology, intelligent transmitters have gradually become the mainstream. In this way, the front-end measurement circuit of the MCU needs to digitize the detection results before the MCU can perform subsequent further processing. [0003] The front-end measurement circuit of the resistance transmitter is the resistance detection and digitization circuit, commonly used single-arm bridge, double-arm bridge and four-arm full bridge, or constant current drive, or resistance bias, etc., out...

AI Technical Summary

Problems solved by technology

[0013] The primary purpose of the present invention is to provide a resistance-capacitance measurement method to solve the complex circuit, high cost, poor anti-interference, low precision, or long sampling time and poor real-time performance of the transmitter front-end measurement circuit in the prior art. Or for the problem that hybrid sensors with resistance and capacitance can not be measured together simply, another object of the present invention is to provide a resistance and capacitance measurement device, which is beneficial to realize the simple measurement of the above method

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