Hydrogen concentration detection equipment

Abstract

The utility model provides hydrogen concentration detection equipment, and belongs to the field of gas concentration detection. Comprising an LED driving module, a photoelectric conversion module, a temperature sensor module, a power supply module and a signal processing module, the output end of the LED driving module is connected with an LED lamp, the photoelectric conversion module receives the light intensity of the LED lamp, the photoelectric conversion module and the temperature sensor module are both connected with the signal processing module, the signal processing module comprises a chip U4, the temperature sensor module comprises a resistor R7 and a temperature sensor R8, one end, connected with the temperature sensor R8, of the resistor R7 is connected to a second ADC pin of the chip U4, and the other end of the resistor R7 is connected with a second ADC pin of the chip U4. The other end of the resistor R7 is connected with the output end of the power module, and the other end of the temperature sensor R8 is grounded. According to the hydrogen concentration detection device, the temperature sensor module is used for performing corresponding temperature compensation, so that the influence of temperature on concentration detection is reduced, and the detected hydrogen concentration is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of gas concentration detection, specifically to a hydrogen concentration detection device. Background Technology

[0002] The structure of a phototransistor is similar to that of a conventional transistor. It contains two PN junctions. Like a photodiode, its emitter junction exhibits photosensitive characteristics, and its collector junction, like a conventional transistor, provides current gain. Therefore, a phototransistor has higher sensitivity than a photodiode. The materials used in a phototransistor are the same as those in a photodiode, and it comes in both PNP and NPN types. While converting optical signals into electrical signals, it also amplifies the signal current, thus possessing an amplification function.

[0003] Because phototransistors have current amplification capabilities, they are widely used in brightness measurement, speed measurement, photoelectric switching circuits, and opto-isolation applications. For example, optocouplers combine phototransistors and light-emitting diodes to form an optocoupler. However, when using phototransistors for photoelectric conversion, the output signal is often affected by temperature, leading to inaccurate detection results. Utility Model Content

[0004] The technical problem to be solved by this invention is how to reduce the influence of temperature on photoelectric conversion and obtain accurate hydrogen concentration detection results.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a hydrogen concentration detection device, including an LED driver module, a photoelectric conversion module, a temperature sensor module, a power supply module, and a signal processing module; the output terminal of the LED driver module is connected to an LED lamp, the photoelectric conversion module receives the light intensity of the LED lamp, the photoelectric conversion module and the temperature sensor module are both connected to the signal processing module, the signal processing module includes a chip U4, the temperature sensor module includes a resistor R7 and a temperature sensor R8, one end of the resistor R7 connected to the temperature sensor R8 is connected to the second ADC pin of the chip U4, the other end of the resistor R7 is connected to the output terminal of the power supply module, and the other end of the temperature sensor R8 is grounded.

[0006] This invention includes a temperature sensor module, which contains a temperature sensor that can perform corresponding temperature compensation when detecting hydrogen concentration, reducing the influence of temperature on the photoelectric conversion module. The temperature compensation mode better controls the stability of the converted signal, making the measured hydrogen concentration more accurate.

[0007] Preferably, the photoelectric conversion module includes a phototransistor PD1, a resistor R2, and a capacitor C4. The collector of the phototransistor PD1 is connected to the output terminal of the power module, and the emitter of the phototransistor PD1 is connected to the resistor R2. The resistor R2 and the capacitor C4 are connected in parallel, with one end connected to the first ADC pin of the chip U4 and the other end grounded.

[0008] This invention employs a phototransistor in its photoelectric conversion module. Under the same light intensity, the converted photocurrent is tens or even hundreds of times larger than that of a photodiode, enabling it to effectively convert and detect weak signals, thus making the detection more accurate. Furthermore, by connecting resistor R2 and capacitor C4 in parallel, the current can be converted into voltage. One end of the voltage is connected to the first ADC pin of chip U4, and the converted voltage can be converted from analog to digital through the chip's ADC interface for corresponding software processing.

[0009] Preferably, the LED driver module includes a chip U1, and the output pin of the chip U1 is connected to the LED lamp.

[0010] Preferably, the LED driving module further includes a resistor R4 and a capacitor C8, with one end of the resistor R4 and capacitor C8 connected in parallel to the VFB pin of the chip U1 and the other end grounded.

[0011] Preferably, the power module includes a chip U3, and the model of the chip U3 is ME6212C50M5G.

[0012] The power module of this utility model uses the ME6212C50M5G chip, which has short-circuit protection and overcurrent protection functions. It can automatically cut off the output when the circuit is abnormal, protect the load and the chip itself, and improve safety and reliability.

[0013] Preferably, the VOUT pin of the chip U3 is connected to the collector of the phototransistor PD1 and one end of the resistor R7.

[0014] Preferably, the VOUT pin of the chip U3 is also connected to the input pin of the chip U1.

[0015] Preferably, the chip U4 is model HC32L072FAUA.

[0016] The signal processing module chip selected in this invention is HC32L072FAUA, which has the advantages of low power consumption, high performance, rich peripherals and high integration. It can quickly obtain the hydrogen concentration through software processing, while controlling the cost.

[0017] Preferably, the signal processing module includes a resistor R36, one end of which is connected to the BOOT pin of the chip U4.

[0018] Preferably, the AVCC pin and DVCC pin of the chip U4 are both connected to the VOUT pin of the chip U3.

[0019] Compared with the prior art, the advantages of this utility model are: the concentration of hydrogen is determined by judging the magnitude of the current generated by the phototransistor, which can detect weak signals. At the same time, a temperature sensor module is added to perform corresponding temperature compensation, making the measured hydrogen concentration more accurate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0021] Figure 2 This is a circuit diagram of the power module according to an embodiment of the present invention;

[0022] Figure 3 This is a circuit diagram of the LED driver module according to an embodiment of the present invention;

[0023] Figure 4 This is a circuit diagram of the temperature sensor module according to an embodiment of the present invention;

[0024] Figure 5 This is a circuit diagram of the photoelectric conversion module according to an embodiment of the present invention;

[0025] Figure 6 This is a circuit diagram of the signal processing module in an embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] Example

[0028] like Figure 1 As shown, this embodiment provides a hydrogen concentration detection device, including an LED driver module, a photoelectric conversion module, a signal processing module, a temperature sensor module, and a power supply module.

[0029] The output of the LED driver module is connected to the LED light. The photoelectric conversion module receives the light intensity from the LED light. Both the photoelectric conversion module and the temperature sensor module are connected to the signal processing module. The power supply module provides power to the LED driver module, the photoelectric conversion module, the signal processing module, and the temperature sensor module.

[0030] like Figure 2 The diagram shows the circuit diagram of the power supply module, which includes chip U3, capacitor C10, and capacitor C11. In this embodiment, chip U3 is model ME6212C50M5G, which has short-circuit protection and overcurrent protection functions. It can automatically cut off the output when the circuit malfunctions, protecting the load and the chip itself, thus improving safety and reliability. Capacitors C10 and C11 are connected in parallel, with one end connected to the VOUT pin of chip U3 and the other end grounded. The VIN and CE pins of chip U3 are connected to the input voltage, the VSS pin is grounded, and the VOUT pin of chip U3 outputs the voltage.

[0031] like Figure 3 The diagram shows the circuit of an LED driver module, which includes a chip U1, a resistor R4, and a capacitor C8. In this embodiment, U1 is a PT4115. Resistor R4 and capacitor C8 are connected in parallel, with one end connected to the VFB pin of chip U1 and the other end grounded. The VCC pin of chip U1 is connected to the VOUT pin of chip U3, the GND pin of chip U1 is grounded, and the DRV pin is connected to the LED to drive it to light up.

[0032] like Figure 4 The diagram shown is a circuit diagram of a temperature sensor module. The temperature sensor module includes a resistor R7 and a temperature sensor R8. The resistor R7 and the temperature sensor R8 are connected in series, and one end of the connection is connected to the signal processing module. The other end of the resistor R7 is connected to the VOUT pin of the chip U3, and the other end of the temperature sensor R8 is grounded.

[0033] like Figure 5 The diagram shown is a circuit diagram of a photoelectric conversion module. The photoelectric conversion module includes a phototransistor PD1, a resistor R2, and a capacitor C4. The collector of the phototransistor PD1 is connected to the VOUT pin of the chip U3, and the emitter is connected to the resistor R2. The other end of the resistor R2 is grounded. The capacitor C4 and the resistor R2 are connected in parallel, and the end of the phototransistor PD1 connected to the resistor R2 is connected to the signal processing module.

[0034] like Figure 6 The diagram shows the circuit diagram of the signal processing module. The signal processing module can be an MCU module or a microcontroller module. In this embodiment, it is a microcontroller module. The microcontroller module includes a chip U4 and a resistor R36. In this embodiment, the chip U4 is model HC32L072FAUA-QN32TR. One end of the resistor R36 is connected to the BOOT pin of the chip U4, and the other end is grounded.

[0035] In the photoelectric conversion module, one end of the phototransistor PD1 connected to resistor R2 is connected to the first ADC pin (PA01 pin) of chip U4. The photoelectric conversion module converts current into voltage by connecting resistor R2 and capacitor C4 in parallel. One end of the parallel resistor R2 and capacitor C4 is connected to the first ADC pin of chip U4. The converted voltage can be converted from analog to digital through the ADC interface of the microcontroller, and then corresponding software processing can be performed. In the temperature sensor module, resistor R7 and temperature sensor R8 are connected in series, and one end of the connection is connected to the second ADC pin (PA06 pin) of chip U4, so that corresponding temperature compensation can be performed. The VCAP and DVSS pins of chip U4 are grounded, the RESETB pin is connected to the NRST reset signal, the AVSS and DVSS pins are connected to the VOUT pin of chip U3, the PA14 pin is connected to the CLK clock signal, the PA13 pin is connected to the DIO digital input / output signal, the PA10 pin is used to output input data / instructions, and the PA09 pin outputs output data / instructions.

[0036] The working principle of the hydrogen concentration detection device in this embodiment is as follows: Since a high hydrogen concentration will have a negative impact on the phototransistor's absorption of LED light intensity, that is, the higher the hydrogen concentration, the weaker the phototransistor's ability to absorb light intensity. At this time, the hydrogen concentration can be determined by judging the magnitude of the current generated by the phototransistor.

[0037] The power module supplies power to the LED driver module to make the LED light up. The phototransistor in the photoelectric conversion module receives the light intensity of the LED light, and the photocurrent is converted into voltage through the photoelectric conversion circuit and input to the ADC interface of the signal processing module. The analog quantity is converted into a digital quantity and processed by software. At the same time, the temperature sensor module performs corresponding temperature compensation. Then, the hydrogen concentration is obtained based on the software processing results.

[0038] This embodiment transforms the difficult-to-observe hydrogen concentration into an intuitive and easily observable quantity through a photoelectric conversion module and a signal processing module. Furthermore, the use of a phototransistor for conversion can fully amplify the weak signal, making the detection more accurate. Simultaneously, the detection uses a temperature compensation mode of a temperature sensor, which can reduce the influence of temperature on photoelectric conversion, further improving the accuracy of the detection results.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. Therefore, any equivalent changes made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A hydrogen concentration detection device, characterized in that, It includes an LED driver module, a photoelectric conversion module, a temperature sensor module, a power supply module, and a signal processing module. The output of the LED driver module is connected to the LED light. The photoelectric conversion module receives the light intensity of the LED light. Both the photoelectric conversion module and the temperature sensor module are connected to the signal processing module. The signal processing module includes a chip U4. The temperature sensor module includes a resistor R7 and a temperature sensor R8. One end of the resistor R7 and the temperature sensor R8 is connected to the second ADC pin of the chip U4. The other end of the resistor R7 is connected to the output of the power supply module. The other end of the temperature sensor R8 is grounded.

2. The hydrogen concentration detection device according to claim 1, characterized in that, The photoelectric conversion module includes a phototransistor PD1, a resistor R2, and a capacitor C4. The collector of the phototransistor PD1 is connected to the output terminal of the power module, and the emitter of the phototransistor PD1 is connected to the resistor R2. The resistor R2 and the capacitor C4 are connected in parallel, with one end connected to the first ADC pin of the chip U4 and the other end grounded.

3. The hydrogen concentration detection device according to claim 1, characterized in that, The LED driver module includes a chip U1, and the output pins of the chip U1 are connected to the LED lamp.

4. The hydrogen concentration detection device according to claim 3, characterized in that, The LED driver module also includes a resistor R4 and a capacitor C8. The resistor R4 and capacitor C8 are connected in parallel, with one end connected to the VFB pin of the chip U1 and the other end grounded.

5. The hydrogen concentration detection device according to claim 4, characterized in that, The power module includes a chip U3, which is model ME6212C50M5G.

6. The hydrogen concentration detection device according to claim 5, characterized in that, The VOUT pin of the chip U3 is connected to the collector of the phototransistor PD1 and one end of the resistor R7.

7. A hydrogen concentration detection device according to claim 6, characterized in that, The VOUT pin of chip U3 is also connected to the input pin of chip U1.

8. The hydrogen concentration detection device according to claim 1, characterized in that, The chip U4 is model number HC32L072FAUA.

9. A hydrogen concentration detection device according to claim 8, characterized in that, The signal processing module includes a resistor R36, one end of which is connected to the BOOT pin of chip U4.

10. A hydrogen concentration detection device according to claim 9, characterized in that, The AVCC and DVCC pins of chip U4 are both connected to the VOUT pin of chip U3.

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