Frequency voltage switching circuit and multi-gear frequency voltage switching method

Abstract

The invention discloses a frequency voltage switching circuit, which comprises a frequency adaptation controller and a frequency voltage switching module. A charge pump output resistance end of the frequency voltage switching module is connected with an adjustable resistor; a frequency gear signal is input into the frequency adaptation controller; and the frequency adaptation controller adjusts the adjustable resistor. The adjustable resistor is a sliding contact type adjustable resistor; and the frequency adaptation controller comprises a frequency gear step switching module and a stepper. The frequency gear signal is input into the frequency gear step switching module and transformed into a step control signal to be output to the stepper through the frequency gear step switching module;and a step control end of the stepper is connected with the sliding contact of the adjustable resistor. The invention also discloses a multi-gear frequency voltage switching method. A frequency gear/step number pair table is established in the frequency adaptation controller. Therefore, when the frequency gear is changed, the frequency adaptation controller can drive the adjustable resistor to change so as to realize the frequency-voltage transformation in the same circuit by searching corresponding step number.

Description

technical field [0001] The invention relates to a sensor frequency-voltage conversion circuit, in particular to a frequency-voltage conversion circuit suitable for various sensors and a multi-level frequency-voltage conversion method. Background technique [0002] The sensors used in coal mines in the prior art to detect continuous physical quantities mostly adopt the form of frequency output, and the frequency output standard often has a variety of 1000Hz, 2000Hz, 5000Hz, etc. These sensors include gas concentration sensors, negative pressure (pressure) sensors, wind speed sensors, liquid Level sensors, level meters, temperature sensors, carbon monoxide sensors and other smart devices that use frequency as a means of data transmission. [0003] For the frequency output sensor, in order to obtain the size of the sensor measurement parameters, the system adopts two methods for subsequent processing of the sensor signal in the subsequent stage 1) directly obtain the output fre...

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Problems solved by technology

[0003] For the frequency output sensor, in order to obtain the size of the sensor measurement parameters, the system adopts two methods for subsequent processing of the sensor signal in the subsequent stage 1) directly obtain the output frequency signal of the sensor, that is, the frequency output sensor needs to perform pulse shaping, CPU software counting or frequency Conversion to analog, analog sampling and other processing; not only increases the hardware cost of the subsequent signal processing of the sensor, but also increases the burden on the CPU, reducing the system stability of the detection system

2) Use the sensor output frequency-voltage conversion circuit to convert the frequency signal output by the sensor into an easy-to-handle voltage signal, and then perform subsequent processing of the sensing signal. Since the processing of the voltage signal has lower requirements on circuit accuracy and hardware equipment than the processing of the frequency signal , so this is a method commonly used at present; however, the frequency-voltage conversion circuit in the prior art has the characteristics of a single circuit form, a circuit design that only converts one type of sensor for one frequency band, and the frequency conversion range of the circuit Fixed and not adjustable

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