Voltage output type carbon monoxide detection circuit

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By designing a voltage output carbon monoxide detection circuit including a current-voltage conversion module and a voltage-proof inverter module, the problem of not being able to convert the current signal output by the carbon monoxide sensor into a voltage signal in the prior art is solved, and the convenience of conversion and identification of voltage signals is achieved.

CN222913611UActive Publication Date: 2025-05-27CHONGQING ZORROALERT TECH CO LTD

View PDF 0 Cites 0 Cited by

Patent Information

Application Number: CN202421765711.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-07-25
Publication Date: 2025-05-27
Estimated Expiration: 2034-07-25

AI Technical Summary

Technical Problem

The existing carbon monoxide monitoring circuit cannot convert the current signal output by the carbon monoxide sensor into a voltage signal, resulting in difficulty in subsequent identification.

Method used

A voltage output carbon monoxide detection circuit is designed, including a carbon monoxide sensor, power supply module, sensor drive module, current-voltage conversion module, anti-voltage connection module and main control module. Through the amplifier U1 in the current voltage conversion module, the current signal output by the carbon monoxide sensor is converted into a voltage signal, and the reference voltage is provided to the amplifier U1 through the anti-voltage inverter module to avoid accessing the negative voltage.

Benefits of technology

The current signal output by the carbon monoxide sensor is realized to convert the current signal into a voltage signal, making subsequent identification more convenient, and solving the problem that the current signal cannot be converted in the prior art.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN222913611U_ABST

Patent Text Reader

Abstract

The utility model discloses a voltage output type carbon monoxide detection circuit, which comprises a carbon monoxide sensor, a power supply module, a sensor driving module, a current-voltage conversion module, a reverse voltage connection prevention module and a main control module, the output end of the power supply module supplies power to the sensor driving module, the sensor driving module drives the carbon monoxide sensor to operate, the first output end of the carbon monoxide sensor is communicated to the inverted input end of the current-voltage conversion module, and the second output end of the carbon monoxide sensor is communicated to the in-phase input end of the current-voltage conversion module; the output end of the power supply module is connected to the input end of the anti-reverse voltage connection module, the output end of the anti-reverse voltage connection module is connected to the in-phase input end of the current-voltage conversion module, and an amplifier U1 is arranged in the current-voltage conversion module. The voltage output type carbon monoxide detection circuit solves the problem that in the prior art, current signals output by a carbon monoxide sensor cannot be converted into voltage signals.

Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to a carbon monoxide detection circuit, in particular to a voltage output type carbon monoxide detection circuit. Background Art

[0002] In the prior art, a carbon monoxide monitoring circuit includes: a carbon monoxide sensor, a signal amplification module, an analog-to-digital conversion module, and a main control module. The output end of the carbon monoxide sensor is connected to the input end of the signal amplification module, the output end of the signal amplification module is connected to the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is connected to the input end of the main control module.

[0003] Although the above carbon monoxide monitoring circuit can achieve the monitoring of carbon monoxide, the disadvantages of the carbon monoxide monitoring circuit are: it cannot convert the current signal output by the carbon monoxide sensor into a voltage signal, resulting in troublesome subsequent identification. Summary of the Utility Model

[0004] The utility model aims to provide a voltage output type carbon monoxide detection circuit to solve the problem in the prior art that the current signal output by the carbon monoxide sensor cannot be converted into a voltage signal.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] The utility model discloses a voltage output type carbon monoxide detection circuit, which includes: a carbon monoxide sensor, a power supply module, a sensor driving module, a current-voltage conversion module, an anti-reverse voltage connection module, and a main control module; the output end of the power supply module supplies power to the sensor driving module, the sensor driving module drives the carbon monoxide sensor to operate, the first output end of the carbon monoxide sensor is connected to the inverting input end of the current-voltage conversion module, and the second output end of the carbon monoxide sensor is connected to the non-inverting input end of the current-voltage conversion module; the output end of the power supply module is connected to the input end of the anti-reverse voltage connection module, the output end of the anti-reverse voltage connection module is connected to the non-inverting input end of the current-voltage conversion module, an amplifier U1 is arranged in the current-voltage conversion module, the anti-reverse voltage connection module provides a reference voltage for the non-inverting input end of the amplifier U1, and the current-voltage conversion module is used to convert the current from the first output end to the second output end of the carbon monoxide sensor into a voltage; the output end of the current-voltage conversion module is connected to the main control module.

[0007] Preferably, the voltage output type carbon monoxide detection circuit further includes: an injection detection module, the input end of the injection detection module is connected to the voltage output end of the main control module, and the output end of the injection detection module is connected to the non-inverting input end of the current-voltage conversion module.

[0008] Preferably, the sensor driving module includes a resistor R1 and a field effect transistor Q1. One end of the resistor R1 is used to connect to the output end of the power supply module, the other end of the resistor R1 is connected to the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is connected to the first end of the carbon monoxide sensor, and the drain of the field effect transistor Q1 is connected to the second end of the carbon monoxide sensor.

[0009] Preferably, the current-voltage conversion module includes resistors R2, R3, R4, R5, R6 and a capacitor C1. The first end of the resistor R2 is connected to one end of the resistor R3, the second end of the resistor R2 is connected to the non-inverting input end of the amplifier U1. The first end of the resistor R2 is the non-inverting input end of the current-voltage conversion module. The other end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the inverting input end of the amplifier U1. The first end of the resistor R4 is the inverting input end of the current-voltage conversion module. The second end of the resistor R4 is connected to one end of the resistor R5 and the positive electrode of the capacitor C1. The negative electrode of the capacitor C1 and the other end of the resistor R5 are connected to the output end of the amplifier U1. The output end of the amplifier U1 is connected to one end of the resistor R6, and the other end of the resistor R6 is the output end of the current-voltage conversion module.

[0010] Preferably, the reverse voltage protection module includes a follower U2, resistors R7, R8, R9 and a capacitor C3. The first end of the resistor R7 is the input end of the reverse voltage protection module. The second end of the resistor R7 and one end of the resistor R8 are both connected to the non-inverting input end of the follower U2. The other end of the resistor R8 is grounded. The inverting input end of the follower U2 is connected to the output end of the follower U2. The high-voltage power supply end of the follower U2 is connected to the output end of the power supply module and the positive electrode of the capacitor C3. The negative electrode of the capacitor C3 is grounded. The follower U2 is connected to one end of the resistor R9, and the other end of the resistor R9 is the output end of the reverse voltage protection module.

[0011] Preferably, the injection detection module includes a resistor R10 and a current limiting diode D1. The first end of the resistor R10 is the input end of the injection detection module. The second end of the resistor R10 is connected to the anode of the current limiting diode D1, and the cathode of the current limiting diode D1 is the output end of the injection detection module.

[0012] Preferably, the output end of the current-voltage conversion module is connected to the positive electrode of the capacitor C2, and the negative electrode of the capacitor C2 is grounded.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] In this application, first, a power supply module is used to provide a voltage of 3.3V DC. Then, a sensor driving module is set up and powered by the power supply module, so that a voltage is applied across the first and second ends of the carbon monoxide sensor, enabling a current to pass through the carbon monoxide sensor. Subsequently, a current-voltage conversion module with an amplifier U1 is designed to convert the current passing through the carbon monoxide sensor into a voltage. At the same time, to cooperate with the operation of the current-voltage conversion module with the amplifier U1, the power supply module is designed to provide a reference voltage to the current-voltage conversion module with the amplifier U1 through an anti-reverse voltage connection module, enabling the current-voltage conversion module with the amplifier U1 to operate, and the anti-reverse voltage connection module can prevent the access of negative voltage, ensuring the normal operation of the current-voltage conversion module with the amplifier U1.

[0015] Other advantages, objectives, and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a circuit diagram of a voltage-output carbon monoxide detection circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the technical means, creative features, achieved objectives, and functions of the present utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0018] As Figure 1 shown, the present utility model discloses a voltage-output carbon monoxide detection circuit, including: a carbon monoxide sensor CO, a power supply module, a sensor driving module, a current-voltage conversion module, an anti-reverse voltage connection module, and a main control module; the output end of the power supply module supplies power to the sensor driving module, the sensor driving module drives the carbon monoxide sensor CO to operate, the first output end of the carbon monoxide sensor CO is connected to the inverting input end of the current-voltage conversion module, and the second output end of the carbon monoxide sensor CO is connected to the non-inverting input end of the current-voltage conversion module; the output end of the power supply module is connected to the input end of the anti-reverse voltage connection module, the output end of the anti-reverse voltage connection module is connected to the non-inverting input end of the current-voltage conversion module, an amplifier U1 is provided in the current-voltage conversion module, the anti-reverse voltage connection module provides a reference voltage to the non-inverting input end of the amplifier U1, and the current-voltage conversion module is used to convert the current from the first output end to the second output end of the carbon monoxide sensor CO into a voltage; the output end of the current-voltage conversion module is connected to the main control module.

[0019] The voltage output type carbon monoxide detection circuit further includes: an injection detection module, the input end of the injection detection module is connected to the voltage output end CO-ERR of the main control module, and the output end of the injection detection module is connected to the non-inverting input end of the current-voltage conversion module.

[0020] The sensor drive module includes: a resistor R1 and a field effect transistor Q1. One end of the resistor R1 is used to connect to the output end of the power supply module, the other end of the resistor R1 is connected to the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is connected to the first end of the carbon monoxide sensor CO, and the drain of the field effect transistor Q1 is connected to the second end of the carbon monoxide sensor CO. The field effect transistor Q1 is turned on only after the +3.3v voltage is output at the output end of the power supply module, so that a current can pass through the carbon monoxide sensor CO.

[0021] The current-voltage conversion module includes: a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a capacitor C1. The first end of the resistor R2 is connected to one end of the resistor R3, the second end of the resistor R2 is connected to the non-inverting input end of the amplifier U1, the first end of the resistor R2 is the non-inverting input end of the current-voltage conversion module, the other end of the resistor R3 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the inverting input end of the amplifier U1, the first end of the resistor R4 is the inverting input end of the current-voltage conversion module, the second end of the resistor R4 is connected to one end of the resistor R5 and the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 and the other end of the resistor R5 are connected to the output end of the amplifier U1, the output end of the amplifier U1 is connected to one end of the resistor R6, and the other end of the resistor R6 is the output end of the current-voltage conversion module.

[0022] The anti-voltage reverse connection module includes: a resistor R7, a resistor R8, a resistor R9 and a capacitor C3. The first end of the resistor R7 is the input end of the anti-voltage reverse connection module, the second end of the resistor R7 and one end of the resistor R8 are both connected to the non-inverting input end of the follower U2, the other end of the resistor R8 is grounded, the inverting input end of the follower U2 is connected to the output end of the follower U2, the high-voltage power supply end of the follower U2 is connected to the output end of the power supply module and the positive electrode of the capacitor C3, the negative electrode of the capacitor C3 is grounded, the follower U2 is connected to one end of the resistor R9, and the other end of the resistor R9 is the output end of the anti-voltage reverse connection module. The voltage at the non-inverting input end of the follower U2 is equal to the voltage at the output end, which has the effect of preventing the 3.3v voltage from being reversely connected.

[0023] The injection detection module includes a resistor R10 and a current-limiting diode D1. The first end of the resistor R10 is the input end of the injection detection module, the second end of the resistor R10 is connected to the anode of the current-limiting diode D1, and the cathode of the current-limiting diode D1 is the output end of the injection detection module. When the voltage output end CO-ERR of the main control module outputs a detection voltage, the detection voltage reaches the non-inverting input end of the current-voltage conversion module after passing through the resistor R10 and the current-limiting diode D1. If the carbon monoxide sensor is damaged, the voltage output by the output end ADC-CO of the current-voltage conversion module will be different from the normal voltage, thereby realizing the monitoring of whether the carbon monoxide sensor is damaged. The current-limiting diode D1 restricts the reverse flow of current into the voltage output end CO-ERR of the main control module, which may cause damage to the main control module, and plays a role in protecting the main control module.

[0024] The output end ADC-CO of the current-voltage conversion module is connected to the positive electrode of the capacitor C2, and the negative electrode of the capacitor C2 is grounded. To stabilize the output voltage of the output end ADC-CO of the current-voltage conversion module.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. Voltage output type carbon monoxide detection circuit, characterized in that: include: Carbon monoxide sensor, power supply module, sensor drive module, current-voltage conversion module, reverse voltage protection module and main control module; The output end of the power supply module supplies power to the sensor driving module, and the sensor driving module drives the carbon monoxide sensor to operate. The first output end of the carbon monoxide sensor is connected to the inverting input end of the current-voltage conversion module, and the second output end of the carbon monoxide sensor is connected to the non-inverting input end of the current-voltage conversion module. The output end of the power supply module is connected to the input end of the anti-voltage reverse connection module, the output end of the anti-voltage reverse connection module is connected to the in-phase input end of the current-voltage conversion module, the current-voltage conversion module is provided with an amplifier U1, the anti-voltage reverse connection module provides a reference voltage for the in-phase input end of the amplifier U1, and the current-voltage conversion module is used to convert the current from the first output end to the second output end of the carbon monoxide sensor into a voltage; The output end of the current-voltage conversion module is connected to the main control module.

2. The voltage output type carbon monoxide detection circuit according to claim 1, characterized in that: Also includes: An injection detection module, wherein the input end of the injection detection module is connected to the voltage output end of the main control module, and the output end of the injection detection module is connected to the in-phase input end of the current-voltage conversion module.

3. The voltage output type carbon monoxide detection circuit according to claim 2, characterized in that: The sensor driving module includes: a resistor R1 and a field effect transistor Q1, one end of the resistor R1 is used to connect to the output end of the power supply module, the other end of the resistor R1 is connected to the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is connected to the first end of the carbon monoxide sensor, and the drain of the field effect transistor Q1 is connected to the second end of the carbon monoxide sensor.

4. The voltage output type carbon monoxide detection circuit according to claim 3, characterized in that: The current-voltage conversion module includes: resistor R2, resistor R3, resistor R4, resistor R5, resistor R6 and capacitor C1, the first end of resistor R2 is connected to one end of resistor R3, the second end of resistor R2 is connected to the non-inverting input end of amplifier U1, the first end of resistor R2 is the non-inverting input end of the current-voltage conversion module, the other end of resistor R3 is connected to the first end of resistor R4, the second end of resistor R4 is connected to the inverting input end of amplifier U1, the first end of resistor R4 is the inverting input end of the current-voltage conversion module, the second end of resistor R4 is connected to one end of resistor R5 and the positive electrode of capacitor C1, the negative electrode of capacitor C1 and the other end of resistor R5 are connected to the output end of amplifier U1, the output end of amplifier U1 is connected to one end of resistor R6, and the other end of resistor R6 is the output end of the current-voltage conversion module.

5. The voltage output type carbon monoxide detection circuit according to claim 4, characterized in that: The anti-voltage reverse connection module includes: a follower U2, a resistor R7, a resistor R8, a resistor R9 and a capacitor C3. The first end of the resistor R7 is the input end of the anti-voltage reverse connection module. The second end of the resistor R7 and one end of the resistor R8 are both connected to the same-phase input end of the follower U2. The other end of the resistor R8 is grounded. The inverting input end of the follower U2 is connected to the output end of the follower U2. The high-voltage power supply end of the follower U2 is connected to the output end of the power supply module and the positive electrode of the capacitor C3. The negative electrode of the capacitor C3 is grounded. The follower U2 is connected to one end of the resistor R9. The other end of the resistor R9 is the output end of the anti-voltage reverse connection module.

6. The voltage output type carbon monoxide detection circuit according to claim 5, characterized in that: The injection detection module includes: a resistor R10 and a current limiting diode D1. The first end of the resistor R10 is the input end of the injection detection module, the second end of the resistor R10 is connected to the anode of the current limiting diode D1, and the cathode of the current limiting diode D1 is the output end of the injection detection module.

7. The voltage output type carbon monoxide detection circuit according to claim 6, characterized in that: The output end of the current-voltage conversion module is connected to the positive electrode of the capacitor C2, and the negative electrode of the capacitor C2 is grounded.