Data collection and processing circuit for carbon measurement

Abstract

The utility model discloses a circuit for collecting and processing data for carbon metering, including: a main control board, a carbon dioxide sensor and a signal processing module. The carbon dioxide sensor is used to detect carbon dioxide, and the output end of the carbon dioxide sensor is connected to the input end of the signal processing module, and the output end of the signal processing module is connected to the input end of the main control board. The circuit for collecting and processing data for carbon metering also includes: a DC power supply module, an analog signal supply module and a controllable analog signal conversion module. The output end of the DC power supply module is connected to the DC power supply end of the main control board, and the output end of the analog signal supply module is connected to the analog voltage supply end of the main control board. The circuit for collecting and processing data for carbon metering solves the problem in the prior art that the analog reference voltage required by the carbon dioxide sensor and the analog supply voltage frequency required by the main control board have nothing to do with each other, which causes trouble for the main control board to identify the output signal of the carbon dioxide sensor.

Description

Technical Field

[0001] The utility model relates to a signal acquisition and processing circuit, in particular to a data acquisition and processing circuit for carbon metering. Background Art

[0002] The monitoring of carbon dioxide is becoming more and more important in production and life, so it is necessary to use circuits for carbon metering data acquisition and processing.

[0003] In the prior art, the circuit for collecting and processing carbon metering data includes: a main control board, a carbon dioxide sensor and a signal processing module. The carbon dioxide sensor is used to detect carbon dioxide. The carbon dioxide concentration is different, and the output end of the carbon dioxide sensor outputs different voltage values. The output end of the carbon dioxide sensor is connected to the input end of the signal processing module, and the output end of the signal processing module is connected to the input end of the main control board. The signal processing module processes the signal so that the main control board can recognize it.

[0004] Although the above-mentioned carbon metering data acquisition and processing circuit can sense and measure carbon dioxide through the carbon dioxide sensor and the signal processing module, the carbon metering data acquisition and processing circuit still has the following disadvantages: since the carbon dioxide sensor needs to provide an analog reference voltage when working, the analog voltage supply end of the main control board also needs an analog supply voltage, and the amplitudes of the analog reference voltage and the analog supply voltage are different, so generally two different analog voltages are used to supply the analog reference voltage and the analog supply voltage respectively, and the frequencies of the two analog voltages have nothing to do with each other. Therefore, it is difficult for the main control board to know the frequency of the analog reference voltage of the carbon dioxide sensor when working, which brings trouble to the main control board's recognition of the output signal of the carbon dioxide sensor. Utility Model Content

[0005] The utility model provides a circuit for collecting and processing carbon metering data, which solves the problem in the prior art that the analog reference voltage required by the carbon dioxide sensor and the analog supply voltage frequency required by the main control board have no relationship, which causes trouble for the main control board to identify the output signal of the carbon dioxide sensor.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses a circuit for collecting and processing data for carbon metering, including: a main control board, a carbon dioxide sensor and a signal processing module, the carbon dioxide sensor is used to detect carbon dioxide, the output end of the carbon dioxide sensor is connected to the input end of the signal processing module, and the output end of the signal processing module is connected to the input end of the main control board. The circuit for collecting and processing data for carbon metering also includes: a DC power supply module, an analog signal supply module and a controllable analog signal conversion module, the output end of the DC power supply module is connected to the DC power supply end of the main control board, the output end of the analog signal supply module is connected to the analog voltage supply end of the main control board, the analog voltage supply end of the main control board is connected to the analog voltage input end of the controllable analog signal conversion module, the DC voltage output end of the main control board is connected to the DC voltage output end of the controllable analog signal conversion module, an adjustable unit is arranged in the controllable analog signal conversion module, the control end of the adjustable unit is connected to the signal output end of the main control board, and the output end of the controllable analog signal conversion module is connected to the reference analog voltage supply end of the carbon dioxide sensor.

[0008] Preferably, the controllable analog signal conversion module includes: a first amplifying unit and a second amplifying unit, the in-phase input terminal of the first amplifying unit is connected to the analog voltage supply terminal of the main control board through the adjustable unit, the inverting input terminal of the first amplifying unit is connected to the DC voltage output terminal of the main control board, the output terminal of the first amplifying unit is connected to the inverting input terminal of the second amplifying unit, the in-phase input terminal of the second amplifying unit is grounded, and the output terminal of the second amplifying unit is the output terminal of the controllable analog signal conversion module.

[0009] Preferably, the adjustable unit includes: a resistor R1, a resistor R2, a sliding resistor R3 and a capacitor C1, the first end of the resistor R1 is connected to the analog voltage supply end of the main control board, the first end of the resistor R1 is connected to the first fixed end of the sliding resistor R3, the second fixed end of the sliding resistor R3 is grounded, the second end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is grounded, the sliding end of the sliding resistor R3 is connected to the positive electrode of the capacitor C1, the positive electrode of the capacitor C1 is connected to the in-phase input end of the first amplification unit, the negative electrode of the capacitor C1 is grounded, and the control end of the sliding resistor R3 is the control end of the adjustable unit.

[0010] Preferably, the first amplifying unit includes: an amplifier U1, a resistor R4 and a resistor R5, the non-inverting input terminal of the amplifier U1 is the non-inverting input terminal of the first amplifying unit, the inverting input terminal of the amplifier U1 is connected to the first terminal of the resistor R4, the second terminal of the resistor R4 is the inverting input terminal of the first amplifying unit, the first terminal of the resistor R4 is connected to one terminal of the resistor R5, the other terminal of the resistor R5 is connected to the output terminal of the amplifier U1, and the output terminal of the amplifier U1 is the output terminal of the first amplifying unit.

[0011] Preferably, the second amplifying unit includes: an amplifier U2, a resistor R6, a resistor R7 and a resistor R8, the first end of the resistor R7 is the in-phase input end of the first amplifying unit, the second end of the resistor R7 is connected to the in-phase input end of the amplifier U2, the inverting input end of the amplifier U2 is connected to the first end of the resistor R6, the second end of the resistor R6 is the inverting input end of the second amplifying unit, the first end of the resistor R6 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the output end of the amplifier U2, and the output end of the amplifier U2 is the output end of the second amplifying unit.

[0012] Preferably, the carbon metering data collection and processing circuit further comprises: a communication module, and the communication module is communicatively connected to the main control board.

[0013] Preferably, the communication module includes: an RS-232 conversion unit, a dual-channel digital isolation unit and a transceiver unit, the RS-232 conversion unit is communicatively connected to the main control board, the RS-232 conversion unit is communicatively connected to the dual-channel digital isolation unit, and the dual-channel digital isolation unit is communicatively connected to the transceiver unit.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In this application, firstly, an analog signal supply module is designed to provide a lower analog signal for the analog voltage supply end of the main control board. The amplitude of this analog signal is about tens of mV, and the amplitude is relatively small. Then, a controllable analog signal conversion module is connected to the analog voltage supply end of the main control board. The controllable analog signal conversion module increases the analog voltage of the analog voltage supply end of the main control board to an analog voltage with a higher amplitude. The analog voltage with a higher amplitude is transmitted to the reference analog voltage supply end of the carbon dioxide sensor, and provides a higher amplitude analog voltage with a frequency for the carbon dioxide sensor to monitor carbon dioxide, so that the reference analog voltage supply end of the carbon dioxide sensor is associated with the analog voltage frequency obtained by the analog voltage supply end of the main control board, which brings convenience for subsequent acquisition and identification. Finally, an adjustable unit is set in the controllable analog signal conversion module to facilitate the output of the controllable analog signal conversion module to be adjusted to a specified amplitude to meet the needs of different types of carbon dioxide sensors.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the circuit diagram of the controllable analog signal conversion module.

[0018] Figure 2 This is the circuit diagram of the RS-232 conversion unit.

[0019] Figure 3 The circuit diagram of the dual-channel digital isolation unit and the transceiver unit. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods:

[0021] like Figures 1 to 3 As shown, the utility model discloses a circuit for collecting and processing data for carbon metering, including: a main control board, a carbon dioxide sensor and a signal processing module, the carbon dioxide sensor is used to detect carbon dioxide, the output end of the carbon dioxide sensor is connected to the input end of the signal processing module, and the output end of the signal processing module is connected to the input end of the main control board. The circuit for collecting and processing data for carbon metering also includes: a DC power supply module, an analog signal supply module and a controllable analog signal conversion module, the output end of the DC power supply module is connected to the DC power supply end of the main control board, the output end of the analog signal supply module is connected to the analog voltage supply end of the main control board, the analog voltage supply end of the main control board is connected to the analog voltage input end of the controllable analog signal conversion module, the DC voltage output end of the main control board is connected to the DC voltage output end of the controllable analog signal conversion module, an adjustable unit is arranged in the controllable analog signal conversion module, the control end of the adjustable unit is connected to the signal output end of the main control board, and the output end of the controllable analog signal conversion module is connected to the reference analog voltage supply end of the carbon dioxide sensor.

[0022] The controllable analog signal conversion module includes: a first amplifying unit and a second amplifying unit. The in-phase input end of the first amplifying unit is connected to the analog voltage supply end of the main control board through the adjustable unit. The inverting input end of the first amplifying unit is connected to the DC voltage output end of the main control board. The output end of the first amplifying unit is connected to the inverting input end of the second amplifying unit. The in-phase input end of the second amplifying unit is grounded. The output end of the second amplifying unit is the output end of the controllable analog signal conversion module. This controllable analog signal conversion module can be regulated in two places. The first regulation is that the adjustable unit can be regulated, and the second regulation is the DC voltage output end of the main control board. The main control board can adjust the output DC voltage value of its own DC voltage output end. The first regulation and the second regulation cooperate with each other to achieve the specified value. At the same time, the first amplifying unit and the second amplifying unit have the function of amplification. The first regulation and the second regulation respectively adjust the two inputs, and then reach the specified amplitude through the first amplifying unit and the second amplifying unit, so as to ensure that the carbon dioxide sensor can be provided with a specified amplitude and an analog signal related to the voltage frequency of the analog voltage supply end of the main control board.

[0023] The adjustable unit includes: resistor R1, resistor R2, sliding resistor R3 and capacitor C1, the first end of resistor R1 is connected to the analog voltage supply end of the main control board, the first end of resistor R1 is connected to the first fixed end of sliding resistor R3, the second fixed end of sliding resistor R3 is grounded, the second end of resistor R1 is connected to one end of resistor R2, the other end of resistor R2 is grounded, the sliding end of sliding resistor R3 is connected to the positive electrode of capacitor C1, the positive electrode of capacitor C1 is connected to the in-phase input end of the first amplification unit, the negative electrode of capacitor C1 is grounded, and the control end of sliding resistor R3 is the control end of the adjustable unit. When adjusting sliding resistor R3, the connected resistor can be controlled.

[0024] The first amplifying unit includes: an amplifier U1, a resistor R4 and a resistor R5, the non-inverting input terminal of the amplifier U1 is the non-inverting input terminal of the first amplifying unit, the inverting input terminal of the amplifier U1 is connected to the first terminal of the resistor R4, the second terminal of the resistor R4 is the inverting input terminal of the first amplifying unit, the first terminal of the resistor R4 is connected to one terminal of the resistor R5, the other terminal of the resistor R5 is connected to the output terminal of the amplifier U1, and the output terminal of the amplifier U1 is the output terminal of the first amplifying unit.

[0025] The second amplifying unit includes: an amplifier U2, a resistor R6, a resistor R7 and a resistor R8, wherein the first end of the resistor R7 is the in-phase input end of the first amplifying unit, the second end of the resistor R7 is connected to the in-phase input end of the amplifier U2, the inverting input end of the amplifier U2 is connected to the first end of the resistor R6, the second end of the resistor R6 is the inverting input end of the second amplifying unit, the first end of the resistor R6 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the output end of the amplifier U2, and the output end of the amplifier U2 is the output end of the second amplifying unit.

[0026] The carbon metering data collection and processing circuit further includes: a communication module, which is communicatively connected with the main control board.

[0027] The communication module includes: RS-232 conversion unit, dual-channel digital isolation unit and transceiver unit. The RS-232 conversion unit is connected to the main control board, the RS-232 conversion unit is connected to the dual-channel digital isolation unit, and the dual-channel digital isolation unit is connected to the transceiver unit. Stable communication with the outside world is achieved.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. Circuit for collecting and processing carbon measurement data, including: A main control board, a carbon dioxide sensor and a signal processing module, wherein the carbon dioxide sensor is used to detect carbon dioxide, the output end of the carbon dioxide sensor is connected to the input end of the signal processing module, and the output end of the signal processing module is connected to the input end of the main control board; characterized in that: It also includes: a DC power supply module, an analog signal supply module and a controllable analog signal conversion module, the output end of the DC power supply module is connected to the DC power supply end of the main control board, the output end of the analog signal supply module is connected to the analog voltage supply end of the main control board, the analog voltage supply end of the main control board is connected to the analog voltage input end of the controllable analog signal conversion module, the DC voltage output end of the main control board is connected to the DC voltage output end of the controllable analog signal conversion module, an adjustable unit is arranged in the controllable analog signal conversion module, the control end of the adjustable unit is connected to the signal output end of the main control board, and the output end of the controllable analog signal conversion module is connected to the reference analog voltage supply end of the carbon dioxide sensor.

2. The carbon measurement data collection and processing circuit according to claim 1, characterized in that: The controllable analog signal conversion module includes: a first amplifying unit and a second amplifying unit. The in-phase input terminal of the first amplifying unit is connected to the analog voltage supply terminal of the main control board through an adjustable unit, the inverting input terminal of the first amplifying unit is connected to the DC voltage output terminal of the main control board, the output terminal of the first amplifying unit is connected to the inverting input terminal of the second amplifying unit, the in-phase input terminal of the second amplifying unit is grounded, and the output terminal of the second amplifying unit is the output terminal of the controllable analog signal conversion module.

3. The carbon measurement data collection and processing circuit according to claim 2, characterized in that: The adjustable unit includes: a resistor R1, a resistor R2, a sliding resistor R3 and a capacitor C1, wherein the first end of the resistor R1 is connected to the analog voltage supply end of the main control board, the first end of the resistor R1 is connected to the first fixed end of the sliding resistor R3, the second fixed end of the sliding resistor R3 is grounded, the second end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is grounded, the sliding end of the sliding resistor R3 is connected to the positive electrode of the capacitor C1, the positive electrode of the capacitor C1 is connected to the in-phase input end of the first amplification unit, the negative electrode of the capacitor C1 is grounded, and the control end of the sliding resistor R3 is the control end of the adjustable unit.

4. The carbon measurement data collection and processing circuit according to claim 3, characterized in that: The first amplifying unit includes: an amplifier U1, a resistor R4 and a resistor R5, the non-inverting input terminal of the amplifier U1 is the non-inverting input terminal of the first amplifying unit, the inverting input terminal of the amplifier U1 is connected to the first terminal of the resistor R4, the second terminal of the resistor R4 is the inverting input terminal of the first amplifying unit, the first terminal of the resistor R4 is connected to one terminal of the resistor R5, the other terminal of the resistor R5 is connected to the output terminal of the amplifier U1, and the output terminal of the amplifier U1 is the output terminal of the first amplifying unit.

5. The carbon measurement data collection and processing circuit according to claim 4, characterized in that: The second amplifying unit includes: an amplifier U2, a resistor R6, a resistor R7 and a resistor R8, wherein the first end of the resistor R7 is the in-phase input end of the first amplifying unit, the second end of the resistor R7 is connected to the in-phase input end of the amplifier U2, the inverting input end of the amplifier U2 is connected to the first end of the resistor R6, the second end of the resistor R6 is the inverting input end of the second amplifying unit, the first end of the resistor R6 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the output end of the amplifier U2, and the output end of the amplifier U2 is the output end of the second amplifying unit.

6. The carbon measurement data collection and processing circuit according to claim 1, characterized in that: Also includes: The communication module is connected to the main control board for communication.

7. The carbon measurement data collection and processing circuit according to claim 6, characterized in that: The communication module includes: an RS-232 conversion unit, a dual-channel digital isolation unit and a transceiver unit. The RS-232 conversion unit is communicatively connected to the main control board, the RS-232 conversion unit is communicatively connected to the dual-channel digital isolation unit, and the dual-channel digital isolation unit is communicatively connected to the transceiver unit.

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