Humidity sensor monitoring circuit and system and fuel cell engine

Abstract

The utility model discloses a humidity sensor monitoring circuit, a humidity sensor monitoring system and a fuel cell engine, the non-inverting input end of a first operational amplifier is connected with the voltage signal output end of a humidity sensor, and the inverting input end of the first operational amplifier is connected with a first voltage division circuit unit; the output end of the first operational amplifier is connected with the second voltage division circuit unit and the delay circuit unit; the non-inverting input end of the second operational amplifier is connected with the delay circuit unit, the inverting input end of the second operational amplifier is connected with the second voltage division circuit unit, and the output end of the second operational amplifier is connected with the level input end and the level identification end; the humidity sensor power supply control end is connected with a power supply of the humidity sensor; and the voltage signal acquisition end of the humidity sensor is connected with the voltage signal output end of the humidity sensor. The working state of the humidity sensor can be automatically monitored, power-on and power-off are controlled, and hardware damage caused by long-time working in a high-humidity environment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of humidity sensor monitoring, in particular to a humidity sensor monitoring circuit, a system and a fuel cell engine. Background Art

[0002] During the bench test of a fuel cell engine, a humidity sensor needs to be installed to collect gas humidity data.

[0003] However, the humidity sensor is prone to damage when working in a high-humidity environment for a long time and requires testers to observe it in real time. Existing humidity sensors need to observe their working conditions and hardware status online, wasting the energy of testers and the hardware of the humidity sensor will be damaged when it is always in a high-humidity environment.

[0004] How to automatically monitor and control the humidity sensor to avoid hardware damage of the humidity sensor is a problem that needs to be solved by those skilled in the art. Summary of the Utility Model

[0005] The utility model provides a humidity sensor monitoring circuit, a system and a fuel cell engine, which can automatically monitor the working state of the humidity sensor and control the power-on and power-off of the humidity sensor to avoid hardware damage caused by the humidity sensor working in a high-humidity environment for a long time.

[0006] In a first aspect, an embodiment of the utility model provides a humidity sensor monitoring circuit, including: a voltage comparison module, a delay output module, a humidity sensor power control module and a main control module;

[0007] The voltage comparison module includes a first operational amplifier and a first voltage dividing circuit unit, the delay output module includes a second voltage dividing circuit unit, a delay circuit unit and a second operational amplifier, the humidity sensor power control module includes a level input end and a humidity sensor power control end, the level input end is connected to the output end of the second operational amplifier, the humidity sensor power control end is connected to the power supply of the humidity sensor, and the main control module includes a humidity sensor voltage signal acquisition end and a level identification end;

[0008] The non-inverting input end of the first operational amplifier is connected to the voltage signal output end of the humidity sensor, the inverting input end of the first operational amplifier is connected to the first voltage dividing circuit unit, and the output end of the first operational amplifier is connected to both the second voltage dividing circuit unit and the delay circuit unit;

[0009] The non-inverting input terminal of the second operational amplifier is connected to the delay circuit unit, the inverting input terminal of the second operational amplifier is connected to the second voltage dividing circuit unit, and the output terminal of the second operational amplifier is connected to both the level input terminal and the level identification terminal; the power supply control terminal of the humidity sensor is connected to the power supply of the humidity sensor; the voltage signal acquisition terminal of the humidity sensor is connected to the voltage signal output terminal of the humidity sensor.

[0010] Optionally, the delay circuit unit includes a first resistor, a first diode, and a first capacitor;

[0011] The positive electrode of the first diode is connected to the output terminal of the first operational amplifier, the negative electrode of the first diode is connected to the non-inverting input terminal of the second operational amplifier, and the first resistor is connected in parallel with the first diode;

[0012] One end of the first capacitor is connected to the non-inverting input terminal of the second operational amplifier, and the other end of the first capacitor is grounded.

[0013] Optionally, the first voltage dividing circuit unit includes a second resistor and a third resistor;

[0014] One end of the second resistor is connected to the system power supply, and the other end of the second resistor is connected to the inverting input terminal of the first operational amplifier;

[0015] One end of the third resistor is connected to the inverting input terminal of the first operational amplifier, and the other end of the third resistor is grounded.

[0016] Optionally, the second voltage dividing circuit unit includes a fourth resistor and a fifth resistor;

[0017] One end of the fourth resistor is connected to the system power supply, the other end of the fourth resistor is connected to both the inverting input terminal of the second operational amplifier and one end of the fifth resistor, and the other end of the fifth resistor is grounded.

[0018] Optionally, the delay output module further includes a sixth resistor, one end of the sixth resistor is connected to the output terminal of the first operational amplifier, and the other end of the sixth resistor is connected to the system power supply.

[0019] Optionally, the delay output module further includes a seventh resistor;

[0020] One end of the seventh resistor is connected to the system power supply, and the other end of the seventh resistor is connected to the output terminal of the second operational amplifier.

[0021] Optionally, the system power supply includes a 24V DC power supply.

[0022] Optionally, the humidity sensor monitoring circuit further includes an acoustic-optic alarm module, and the main control module further includes an alarm control terminal;

[0023] The alarm control terminal is connected to the acoustic-optic alarm module.

[0024] In a second aspect, an embodiment of the present invention further provides a humidity sensor monitoring system, including the humidity sensor monitoring circuit and a humidity sensor as described in the first aspect.

[0025] In a third aspect, an embodiment of the present invention further provides a fuel cell engine, including the humidity sensor monitoring system as described in the second aspect.

[0026] An embodiment of the present invention provides a humidity sensor monitoring circuit, system and fuel cell engine. The circuit includes: a voltage comparison module, a delay output module, a humidity sensor power control module and a main control module. The voltage comparison module includes a first operational amplifier and a first voltage dividing circuit unit. The delay output module includes a second voltage dividing circuit unit, a delay circuit unit and a second operational amplifier. The humidity sensor power control module includes a level input terminal and a humidity sensor power control terminal. The level input terminal is connected to the output terminal of the second operational amplifier. The humidity sensor power control terminal is connected to the power supply of the humidity sensor. The main control module includes a humidity sensor voltage signal acquisition terminal and a level identification terminal. The non-inverting input terminal of the first operational amplifier is connected to the voltage signal output terminal of the humidity sensor. The inverting input terminal of the first operational amplifier is connected to the first voltage dividing circuit unit. The output terminal of the first operational amplifier is connected to both the second voltage dividing circuit unit and the delay circuit unit. The non-inverting input terminal of the second operational amplifier is connected to the delay circuit unit. The inverting input terminal of the second operational amplifier is connected to the second voltage dividing circuit unit. The output terminal of the second operational amplifier is connected to both the level input terminal and the level identification terminal. The humidity sensor power control terminal is connected to the power supply of the humidity sensor. The humidity sensor voltage signal acquisition terminal is connected to the voltage signal output terminal of the humidity sensor. By setting the voltage comparison module and the delay output module in the embodiment of the present invention, the humidity timeout period can be controlled to effectively protect the humidity sensor, the working state of the humidity sensor can be automatically monitored without manual participation, and the humidity sensor power control module can control the power-on and power-off of the humidity sensor to avoid hardware damage caused by the humidity sensor working in a high humidity environment for a long time.

[0027] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of a humidity sensor monitoring circuit provided by an embodiment of the present invention;

[0030] Figure 2 It is a schematic structure of another humidity sensor monitoring circuit provided by an embodiment of the present invention;

[0031] Figure 3 It is a schematic structural diagram of a humidity sensor monitoring system provided by an embodiment of the present invention. Specific Embodiments

[0032] In order to enable those in the technical field to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0034] Figure 1 It is a schematic structural diagram of a humidity sensor monitoring circuit provided by an embodiment of the present invention. Refer to Figure 1 , the humidity sensor monitoring circuit includes: a voltage comparison module 110, a delay output module 120, a humidity sensor power control module 130, and a main control module 140.

[0035] Continue to refer toFigure 1 , the voltage comparison module 110 includes a first operational amplifier U1 and a first voltage dividing circuit unit 111, the delay output module 120 includes a second voltage dividing circuit unit 121, a delay circuit unit 122 and a second operational amplifier U2, the humidity sensor power control module 130 includes a level input terminal IN1 and a humidity sensor power control terminal OUT1, the level input terminal IN1 is connected to the output terminal of the second operational amplifier U2, and the humidity sensor power control terminal OUT1 is connected to the power supply 210 of the humidity sensor 200. The main control module 140 includes a humidity sensor voltage signal acquisition terminal IN2 and a level identification terminal IN3.

[0036] Continue to refer to Figure 1 , the non-inverting input terminal of the first operational amplifier U1 is connected to the voltage signal output terminal OUT2 of the humidity sensor 200, the inverting input terminal of the first operational amplifier U1 is connected to the first voltage dividing circuit unit 111, and the output terminal of the first operational amplifier U1 is connected to both the second voltage dividing circuit unit 121 and the delay circuit unit 122.

[0037] Continue to refer to Figure 1 , the non-inverting input terminal of the second operational amplifier U2 is connected to the delay circuit unit 122, the inverting input terminal of the second operational amplifier U2 is connected to the second voltage dividing circuit unit 121, and the output terminal of the second operational amplifier U2 is connected to both the level input terminal IN1 and the level identification terminal IN3; the humidity sensor power control terminal OUT1 is connected to the power supply 210 of the humidity sensor 200; the humidity sensor voltage signal acquisition terminal IN2 is connected to the voltage signal output terminal OUT2 of the humidity sensor 200.

[0038] It can be understood that in the embodiment of the present utility model, the voltage comparison module 110 processes the voltage signal output by the humidity sensor 200, and determines whether the environment where the humidity sensor 200 is located exceeds the humidity boundary through this voltage signal. If it exceeds the boundary, the output end of the first operational amplifier U1 in the voltage comparison module 110 outputs a high level. If the humidity signal continuously exceeds the boundary, the output end of the first operational amplifier U1 continuously outputs a high level. If the humidity signal returns to the normal boundary range, the output end of the first operational amplifier U1 outputs a low level. If the output end of the first operational amplifier U1 maintains a high level within the second continuous time T, this signal outputs a high level at the output end of the second operational amplifier U2 after passing through the delay output module 120. If the output signal of the output end of the first operational amplifier U1 fails to maintain a high level within the second continuous time T, the second operational amplifier U2 outputs a low level. The high level output by the second operational amplifier U2 can drive the humidity sensor power control module 130 to turn off the output, thereby cutting off the power supply of the humidity sensor 200, so that the humidity sensor 200 does not power on and work in a high humidity environment for a long time. At the same time, the voltage signal output by the humidity sensor 200 and the signal output by the second operational amplifier U2 will also be collected by the main control chip for confirming the reason for the disconnection of the humidity sensor signal.

[0039] In the embodiment of the present utility model, by setting the voltage comparison module 110 and the delay output module 120, the humidity timeout period can be controlled to effectively protect the humidity sensor, and the working state of the humidity sensor 200 can be automatically monitored without manual participation. The humidity sensor power control module 130 can control the power on and off of the humidity sensor 200 to avoid hardware damage caused by the humidity sensor 200 working in a high humidity environment for a long time.

[0040] Figure 2 It is a schematic structural diagram of another humidity sensor monitoring circuit provided by the embodiment of the present utility model. Optionally, on the basis of the above embodiment, continue to refer to Figure 2 The delay circuit unit 122 includes a first resistor R1, a first diode D1, and a first capacitor C1. The positive electrode of the first diode D1 is connected to the output end of the first operational amplifier U1, the negative electrode of the first diode D1 is connected to the non-inverting input end of the second operational amplifier U2, and the first resistor R1 is connected in parallel with the first diode D1. One end of the first capacitor C1 is connected to the non-inverting input end of the second operational amplifier U2, and the other end of the first capacitor C1 is grounded.

[0041] It can be understood that the time when the output end of the first operational amplifier U1 outputs a high level can be defined as the first time t, and the delay time of the delay circuit unit 122 can be defined as the second time T.

[0042] In the embodiment of the present utility model, the delay circuit unit 122 is provided to control the humidity timeout period to effectively protect the humidity sensor, and avoid frequent damage of the humidity sensor 200 caused by the frequent control of the power-on and power-off of the humidity sensor by the humidity sensor power control module 130.

[0043] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the first voltage dividing circuit unit 111 includes a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected to the system power supply VCC, and the other end of the second resistor R2 is connected to the inverting input terminal of the first operational amplifier U1. One end of the third resistor R3 is connected to the inverting input terminal of the first operational amplifier U1, and the other end of the third resistor R3 is grounded.

[0044] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the second voltage dividing circuit unit 121 includes a fourth resistor R4 and a fifth resistor R5. One end of the fourth resistor R4 is connected to the system power supply VCC, and the other end of the fourth resistor R4 is connected to both the inverting input terminal of the second operational amplifier U2 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is grounded.

[0045] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the delay output module 120 further includes a sixth resistor R6. One end of the sixth resistor R6 is connected to the output terminal of the first operational amplifier U1, and the other end of the sixth resistor R6 is connected to the system power supply VCC.

[0046] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the delay output module 120 further includes a seventh resistor R7. One end of the seventh resistor R7 is connected to the system power supply VCC, and the other end of the seventh resistor R7 is connected to the output terminal of the second operational amplifier U2.

[0047] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the system power supply VCC includes a 24V DC power supply.

[0048] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the humidity sensor monitoring circuit further includes an acoustic-optic alarm module 150, and the main control module 140 further includes an alarm control terminal OUT3. The alarm control terminal OUT3 is connected to the acoustic-optic alarm module 150.

[0049] Optionally, based on the above embodiments, a timing unit is provided in the main control module 140. During the humidity test by the humidity sensor 200, if the monitored humidity exceeds the set boundary, software and hardware timing are performed. Set the first time t as the duration after the humidity exceeds, that is, the time when the output terminal of the first operational amplifier U1 outputs a high level. Set the second time T as the humidity timeout period, that is, the delay time of the delay circuit unit 122. If t < T and the humidity drops to the safe range, the timing is stopped and the timer is cleared, and the monitoring continues. This situation is called situation 1. If t ≥ T, that is, the humidity overrun situation reaches the timeout threshold, it is called situation 2. If situation 1 occurs continuously for X times, it becomes situation 3, where X is a positive integer and can be freely set. For situation 1, no processing is done to the humidity sensor. For situations 2 and 3, control issues sensor shutdown instructions and actions through software and hardware. At the same time, an audible and visual alarm is used to remind the operator that the sensor has dropped offline actively.

[0050] In the embodiment of the present invention, by setting the voltage comparison module 110 and the delay output module 120, the humidity timeout period can be controlled to effectively protect the humidity sensor, and the working state of the humidity sensor 200 can be automatically monitored without manual intervention. The humidity sensor power control module 130 can control the power-on and power-off of the humidity sensor 200 to avoid hardware damage caused by the humidity sensor 200 working in a high humidity environment for a long time. Setting the audible and visual alarm module 150 can remind the operator that the sensor has dropped offline actively through an audible and visual alarm.

[0051] Figure 3 It is a schematic structural diagram of a humidity sensor monitoring system provided by an embodiment of the present invention. Refer to Figure 3 , the humidity sensor monitoring system includes the humidity sensor monitoring circuit 100 and the humidity sensor 200 provided by the above embodiment.

[0052] The humidity sensor monitoring system provided by the embodiment of the present invention includes all the technical features of the humidity sensor monitoring circuit provided by the above embodiment, so it has the same beneficial effects. For the content not described in detail in this embodiment, reference can be made to the humidity sensor monitoring circuit provided by the above embodiment.

[0053] The embodiment of the present invention also provides a fuel cell engine, including the humidity sensor monitoring system provided by the above embodiment.

[0054] The fuel cell engine provided by the embodiment of the present invention includes all the technical features of the humidity sensor monitoring system provided by the above embodiment, so it has the same beneficial effects. For the content not described in detail in this embodiment, reference can be made to the humidity sensor monitoring circuit provided by the above embodiment.

[0055] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A humidity sensor monitoring circuit, characterized in that: include: Voltage comparison module, delay output module, humidity sensor power supply control module and main control module; The voltage comparison module includes a first operational amplifier and a first voltage divider circuit unit, the delay output module includes a second voltage divider circuit unit, a delay circuit unit and a second operational amplifier, the humidity sensor power supply control module includes a level input terminal and a humidity sensor power supply control terminal, the level input terminal is connected to the output terminal of the second operational amplifier, the humidity sensor power supply control terminal is connected to the power supply of the humidity sensor, and the main control module includes a humidity sensor voltage signal acquisition terminal and a level recognition terminal; The non-inverting input terminal of the first operational amplifier is connected to the voltage signal output terminal of the humidity sensor, the inverting input terminal of the first operational amplifier is connected to the first voltage divider circuit unit, and the output terminal of the first operational amplifier is connected to both the second voltage divider circuit unit and the delay circuit unit; The non-inverting input terminal of the second operational amplifier is connected to the delay circuit unit, the inverting input terminal of the second operational amplifier is connected to the second voltage divider circuit unit, and the output terminal of the second operational amplifier is connected to both the level input terminal and the level identification terminal; the humidity sensor power supply control terminal is connected to the power supply of the humidity sensor; and the humidity sensor voltage signal acquisition terminal is connected to the voltage signal output terminal of the humidity sensor.

2. The humidity sensor monitoring circuit according to claim 1, characterized in that: The delay circuit unit includes a first resistor, a first diode and a first capacitor; The anode of the first diode is connected to the output terminal of the first operational amplifier, the cathode of the first diode is connected to the non-inverting input terminal of the second operational amplifier, and the first resistor is connected in parallel with the first diode; One end of the first capacitor is connected to the non-inverting input terminal of the second operational amplifier, and the other end of the first capacitor is grounded.

3. The humidity sensor monitoring circuit according to claim 1, characterized in that: The first voltage dividing circuit unit includes a second resistor and a third resistor; One end of the second resistor is connected to the system power supply, and the other end of the second resistor is connected to the inverting input end of the first operational amplifier; One end of the third resistor is connected to the inverting input terminal of the first operational amplifier, and the other end of the third resistor is grounded.

4. The humidity sensor monitoring circuit according to claim 1, characterized in that: The second voltage dividing circuit unit includes a fourth resistor and a fifth resistor; One end of the fourth resistor is connected to the system power supply, the other end of the fourth resistor is connected to the inverting input terminal of the second operational amplifier and one end of the fifth resistor, and the other end of the fifth resistor is grounded.

5. The humidity sensor monitoring circuit according to claim 4, characterized in that: The delay output module further includes a sixth resistor, one end of the sixth resistor is connected to the output end of the first operational amplifier, and the other end of the sixth resistor is connected to the system power supply.

6. The humidity sensor monitoring circuit according to claim 4, characterized in that: The delay output module also includes a seventh resistor; One end of the seventh resistor is connected to the system power supply, and the other end of the seventh resistor is connected to the output end of the second operational amplifier.

7. The humidity sensor monitoring circuit according to any one of claims 3 or 4, characterized in that: The system power supply includes a 24V DC power supply.

8. The humidity sensor monitoring circuit according to claim 1, characterized in that: The humidity sensor monitoring circuit also includes an audible and visual alarm module, and the main control module also includes an alarm control terminal; The alarm control terminal is connected to the sound and light alarm module.

9. A humidity sensor monitoring system, characterized in that: It comprises a humidity sensor monitoring circuit and a humidity sensor as described in any one of claims 1 to 8.

10. A fuel cell engine, characterized in that: Comprising the humidity sensor monitoring system as described in claim 9.

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