Air pressure calibration circuit and gas detector suitable for plateau environment

Abstract

The present application relates to an air pressure calibration circuit and a gas detector suitable for plateau environments. The air pressure calibration circuit is suitable for gas detectors used in plateau environments, including: a sensor main chip and an air pressure sensor chip; the sensor main chip is electrically connected to the air pressure sensor chip; the MOSI pin of the air pressure sensor chip is electrically connected to the SDA pin of the sensor main chip, and the SCK pin of the air pressure sensor chip is electrically connected to the SCL pin of the sensor main chip; the VDD pin of the air pressure sensor chip is electrically connected to one end of a capacitor, the PS pin of the air pressure sensor chip is electrically connected to one end of the capacitor, and one end of the capacitor is electrically connected to a power supply; the GND pin of the air pressure sensor chip is electrically connected to the other end of the capacitor, the CS pin of the air pressure sensor chip is electrically connected to the other end of the capacitor, and the other end of the capacitor is grounded; the CS1 pin of the air pressure sensor chip is grounded.

Description

Technical Field

[0001] The present application relates to the technical field of gas detector verification and calibration, and in particular to an air pressure calibration circuit and a gas detector suitable for plateau environments. Background Art

[0002] Gas detectors are widely used in places such as petroleum, chemical, natural gas, metallurgy and municipal administration where the concentration of combustible gas, toxic (harmful) gas and volatile organic compound needs to be detected. Gas detectors have a wide range of applications and are mostly installed outdoors. The locations are complex and changeable, especially in plateau environments where the environmental and climatic conditions are complex. The air in high altitude areas is relatively thin, the oxygen content is low, and the atmospheric pressure is lower than that in plain areas. Gas detectors are greatly affected by high altitudes. As a result, the detector response time is prone to slow down and the sensitivity is reduced during the sampling process of the gas detector. In the existing gas detector sampling process, when the on-site working environment pressure changes, the sensitivity of the gas detector decreases, the reaction time is also prolonged, and the accuracy of the detector decreases. Utility Model Content

[0003] In view of this, the present application proposes an air pressure calibration circuit and a gas detector suitable for plateau environments to solve the above problems.

[0004] According to one aspect of the present application, there is provided an air pressure calibration circuit suitable for plateau environments, comprising: a sensor main chip and an air pressure sensor chip; the sensor main chip is electrically connected to the air pressure sensor chip;

[0005] The MOSI pin of the air pressure sensor chip is electrically connected to the SDA pin of the sensor main chip, and the SCK pin of the air pressure sensor chip is electrically connected to the SCL pin of the sensor main chip;

[0006] The VDD pin of the air pressure sensor chip is electrically connected to one end of a capacitor, the PS pin of the air pressure sensor chip is electrically connected to one end of the capacitor, and one end of the capacitor is electrically connected to a power supply;

[0007] The GND pin of the pressure sensor chip is electrically connected to the other end of the capacitor, the CS pin of the pressure sensor chip is electrically connected to the other end of the capacitor, and the other end of the capacitor is grounded; the CS1 pin of the pressure sensor chip is grounded.

[0008] In a possible implementation, the VCC pin of the sensor main chip is electrically connected to a power supply, and the AVCC pin of the sensor main chip is electrically connected to a power supply; the GND pin of the sensor main chip is grounded, and the AGND pin of the sensor main chip is grounded.

[0009] In a possible implementation, the MOSI pin of the air pressure sensor chip is electrically connected to the SDA pin of the sensor main chip through the I2C bus, and the SCK pin of the air pressure sensor chip is electrically connected to the SCL pin of the sensor main chip through the I2C bus.

[0010] In a possible implementation, the model of the sensor main chip is ATMEGA32A-AU; the model of the air pressure sensor chip is MS5611.

[0011] In a possible implementation manner, the capacitance value of the capacitor is 0.1 μF.

[0012] According to another aspect of the present application, a gas detector is provided, comprising: the above-mentioned air pressure calibration circuit suitable for plateau environment and the gas detector main circuit; the air pressure calibration circuit suitable for plateau environment and the gas detector main circuit are electrically connected, and the air pressure calibration circuit suitable for plateau environment is electrically connected to the gas detector main circuit via a communication interface.

[0013] In a possible implementation, the air pressure calibration circuit suitable for plateau environments further includes: a temperature sensor chip; the temperature sensor chip is electrically connected to the sensor main chip.

[0014] In a possible implementation, the air pressure calibration circuit suitable for plateau environments also includes: a sensor chip, an amplifier circuit and an A / D conversion circuit; the sensor chip is electrically connected to the amplifier circuit, the amplifier circuit is electrically connected to the A / D conversion circuit, and the A / D conversion circuit is electrically connected to the sensor main chip.

[0015] In a possible implementation, the gas detector main circuit also includes: a D / A conversion circuit, a V / I conversion circuit and a signal output terminal; the gas detector main circuit is electrically connected to the D / A conversion circuit, the D / A conversion circuit is electrically connected to the V / I conversion circuit, and the V / I conversion circuit is electrically connected to the signal output terminal.

[0016] In a possible implementation, the gas detector main circuit also includes: an alarm terminal, a display terminal, a contact output terminal and a magnetic control adjustment terminal; the alarm terminal is electrically connected to the gas detector main circuit; the display terminal is electrically connected to the gas detector main circuit; the contact output terminal is electrically connected to the gas detector main circuit; and the magnetic control adjustment terminal is electrically connected to the gas detector main circuit.

[0017] Beneficial effects of this application:

[0018] The pressure calibration circuit suitable for plateau environment proposed in this embodiment has a simple connection method. A pressure sensor chip is added to the gas detector circuit. When the gas detector is in normal working state and detects that the ambient pressure is too low, the pressure sensor chip transmits the pressure data to the sensor main chip through the I2C bus, modifies the relevant parameters of the software, and adjusts the detection sensitivity and response time of the gas detector. In this way, the problem of reduced detector sensitivity and prolonged response time can be solved in a high-altitude and low-pressure environment. Specifically, SCL and SDA are I 2 The two signal lines of the C bus are used to transmit the clock and data respectively. SCL is used to synchronize the transmission timing of data and generate start and stop signals. SDA is provided by the air pressure sensor chip. When the air pressure is too low, the high and low levels of the pressure data are transmitted to the sensor main chip, thereby modifying the relevant parameters of the software. Solve the problem of reduced detector sensitivity and prolonged response time. The proposed gas detector, by adding an air pressure calibration circuit suitable for plateau environment, allows the gas detector to be used under low pressure conditions, and at the same time greatly improves the sensitivity of the gas detector and increases the response time under low pressure conditions. The gas detector works more reliably, accurately and safely.

[0019] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic diagram showing an air pressure calibration circuit suitable for plateau environments according to an embodiment of the present application;

[0022] Figure 2 The internal schematic diagram of the gas detector according to the embodiment of the present application is shown. DETAILED DESCRIPTION

[0023] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0024] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0027] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0028] like Figure 1 As shown, the air pressure calibration circuit suitable for plateau environment includes: a sensor main chip U2 and an air pressure sensor chip U3; the sensor main chip U2 is electrically connected to the air pressure sensor chip U3; the MOSI pin of the air pressure sensor chip U3 is electrically connected to the SDA pin of the sensor main chip U2, and the SCK pin of the air pressure sensor chip U3 is electrically connected to the SCL pin of the sensor main chip U2; the VDD pin of the air pressure sensor chip U3 is electrically connected to one end of the capacitor C3, the PS pin of the air pressure sensor chip U3 is electrically connected to one end of the capacitor C3, and one end of the capacitor C3 is electrically connected to the power supply; the GND pin of the air pressure sensor chip U3 is electrically connected to the other end of the capacitor C3, the CS pin of the air pressure sensor chip U3 is electrically connected to the other end of the capacitor C3, and the other end of the capacitor C3 is grounded; the CS1 pin of the air pressure sensor chip U3 is grounded.

[0029] The pressure calibration circuit suitable for plateau environment proposed in this embodiment has a simple connection method. A pressure sensor chip U3 is added to the gas detector circuit. When the gas detector is in normal working state and detects that the ambient air pressure is too low, the pressure data is transmitted to the sensor main chip U2 through the I2C bus through the pressure sensor chip U3, and the relevant parameters of the software are modified to adjust the detection sensitivity and response time of the gas detector. In this way, the problem of reduced detector sensitivity and prolonged response time can be solved in a high-altitude and low-pressure environment. Specifically, SCL and SDA are I 2 The two signal lines of the C bus are used to transmit clock and data respectively. SCL is used to synchronize the transmission timing of data and generate start and stop signals. SDA is provided by the air pressure sensor chip U3. When the air pressure is too low, it transmits the high and low levels of pressure data to the sensor main chip U2, thereby modifying the relevant parameters of the software. This solves the problem of reduced detector sensitivity and prolonged response time.

[0030] In addition, it should be noted that the software parts involved in this application can all be implemented through existing technologies, so they will not be described in detail in this embodiment.

[0031] In a possible implementation, the VCC pin of the sensor main chip U2 is electrically connected to the power supply, and the AVCC pin of the sensor main chip U2 is electrically connected to the power supply; the GND pin of the sensor main chip U2 is grounded, and the AGND pin of the sensor main chip U2 is grounded.

[0032] In one possible implementation, in one possible implementation, the MOSI pin of the air pressure sensor chip U3 is electrically connected to the SDA pin of the sensor main chip U2 through the I2C bus, and the SCK pin of the air pressure sensor chip U3 is electrically connected to the SCL pin of the sensor main chip U2 through the I2C bus.

[0033] In a possible implementation, the model of the sensor main chip U2 is ATMEGA32A-AU; the model of the air pressure sensor chip U3 is MS5611. The MS5611 air pressure sensor chip U3 improves the conversion speed and optimizes the current consumption to better meet the needs of users. It should also be noted that ATmega32A executes instructions in a single clock cycle and can achieve a throughput of nearly 1MIPS / MHz, thereby balancing and optimizing the power consumption and processing speed of the system.

[0034] In one possible implementation, the capacitance C3 of capacitor C3 is 0.1 μF. In this embodiment, it should be noted that capacitor C3 is set to filter and decouple the power supply of the input air pressure sensor chip U3. Specifically, the 0.1 uF capacitor C3 allows the high-frequency AC part of the voltage to go from capacitor C3 to the ground, so that the chip can obtain a stable DC voltage.

[0035] like Figure 2 As shown, the gas detector includes: the above-mentioned air pressure calibration circuit suitable for plateau environment and gas detector main circuit; the air pressure calibration circuit suitable for plateau environment and the gas detector main circuit are electrically connected, and the air pressure calibration circuit suitable for plateau environment is electrically connected to the gas detector main circuit through a communication interface.

[0036] The gas detector proposed in this embodiment adds a gas pressure calibration circuit suitable for plateau environments, so that the gas detector can be used in low-pressure conditions. At the same time, the sensitivity of the gas detector is greatly improved, and the response time in low-pressure conditions is increased. The operation of the gas detector is more reliable, accurate and safe.

[0037] In a possible implementation, the air pressure calibration circuit suitable for plateau environment further includes: a temperature sensor chip; the temperature sensor chip is electrically connected to the sensor main chip U2. The temperature signal is transmitted to the sensor main chip U2, and the relevant detection parameters are adjusted to obtain relatively accurate sampling parameters.

[0038] In one possible implementation, the air pressure calibration circuit suitable for plateau environments also includes: a sensor chip, an amplifier circuit and an A / D conversion circuit; the sensor chip is electrically connected to the amplifier circuit, the amplifier circuit is electrically connected to the A / D conversion circuit, and the A / D conversion circuit is electrically connected to the sensor main chip U2.

[0039] In one possible implementation, the gas detector main circuit also includes: a D / A conversion circuit, a V / I conversion circuit and a signal output terminal; the gas detector main circuit is electrically connected to the D / A conversion circuit, the D / A conversion circuit is electrically connected to the V / I conversion circuit, and the V / I conversion circuit is electrically connected to the signal output terminal.

[0040] In a possible implementation, the main circuit of the gas detector further includes: an alarm terminal, a display terminal, a contact output terminal, and a magnetic control adjustment terminal; the alarm terminal is electrically connected to the main circuit of the gas detector; the display terminal is electrically connected to the main circuit of the gas detector; the contact output terminal is electrically connected to the main circuit of the gas detector; and the magnetic control adjustment terminal is electrically connected to the main circuit of the gas detector. In this embodiment, it should be noted that the alarm terminal, the display terminal, the contact output terminal, and the magnetic control adjustment terminal are set in multiple aspects, so as to improve the safety performance of the gas detector while obtaining relatively accurate sampling parameters, and better meet user needs.

[0041] It should be noted that although the present application is used as an example to introduce the air pressure calibration circuit and gas detector suitable for plateau environment, those skilled in the art can understand that the present application should not be limited thereto. In fact, the user can flexibly set it according to personal preferences and / or actual application scenarios, as long as it is reasonable.

[0042] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A pressure calibration circuit suitable for plateau environments, suitable for gas detectors used in plateau environments, characterized in that: include: A sensor main chip and an air pressure sensor chip; the sensor main chip is electrically connected to the air pressure sensor chip; The MOSI pin of the air pressure sensor chip is electrically connected to the SDA pin of the sensor main chip, and the SCK pin of the air pressure sensor chip is electrically connected to the SCL pin of the sensor main chip; The VDD pin of the air pressure sensor chip is electrically connected to one end of a capacitor, the PS pin of the air pressure sensor chip is electrically connected to one end of the capacitor, and one end of the capacitor is electrically connected to a power supply; The GND pin of the pressure sensor chip is electrically connected to the other end of the capacitor, the CS pin of the pressure sensor chip is electrically connected to the other end of the capacitor, and the other end of the capacitor is grounded; the CS1 pin of the pressure sensor chip is grounded.

2. The air pressure calibration circuit suitable for plateau environment according to claim 1, characterized in that: The VCC pin of the sensor main chip is electrically connected to a power supply, and the AVCC pin of the sensor main chip is electrically connected to a power supply; the GND pin of the sensor main chip is grounded, and the AGND pin of the sensor main chip is grounded.

3. The air pressure calibration circuit suitable for plateau environment according to claim 1, characterized in that: The MOSI pin of the air pressure sensor chip is electrically connected to the SDA pin of the sensor main chip through the I2C bus, and the SCK pin of the air pressure sensor chip is electrically connected to the SCL pin of the sensor main chip through the I2C bus.

4. The air pressure calibration circuit suitable for plateau environment according to claim 1, characterized in that: The model of the sensor main chip is ATMEGA32A-AU; the model of the air pressure sensor chip is MS5611.

5. The air pressure calibration circuit suitable for plateau environment according to claim 1, characterized in that: The capacitance value of the capacitor is 0.1 μF.

6. A gas detector, characterized in that: include: The air pressure calibration circuit and gas detector main circuit suitable for plateau environments as described in any one of claims 1-5; the air pressure calibration circuit suitable for plateau environments and the gas detector main circuit are electrically connected, and the air pressure calibration circuit suitable for plateau environments is electrically connected to the gas detector main circuit via a communication interface.

7. The gas detector according to claim 6, characterized in that: The air pressure calibration circuit suitable for plateau environment also includes: a temperature sensor chip; the temperature sensor chip is electrically connected to the sensor main chip.

8. The gas detector according to claim 6, characterized in that: The air pressure calibration circuit suitable for plateau environment also includes: a sensor chip, an amplifier circuit and an A / D conversion circuit; the sensor chip is electrically connected to the amplifier circuit, the amplifier circuit is electrically connected to the A / D conversion circuit, and the A / D conversion circuit is electrically connected to the sensor main chip.

9. The gas detector according to claim 6, characterized in that: The gas detector main circuit also includes: a D / A conversion circuit, a V / I conversion circuit and a signal output terminal; the gas detector main circuit is electrically connected to the D / A conversion circuit, the D / A conversion circuit is electrically connected to the V / I conversion circuit, and the V / I conversion circuit is electrically connected to the signal output terminal.

10. The gas detector according to claim 6, characterized in that: The gas detector main circuit also includes: an alarm terminal, a display terminal, a contact output terminal and a magnetic control adjustment terminal; the alarm terminal is electrically connected to the gas detector main circuit; the display terminal is electrically connected to the gas detector main circuit; the contact output terminal is electrically connected to the gas detector main circuit; the magnetic control adjustment terminal is electrically connected to the gas detector main circuit.

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