Humidifier water quality detection circuit

Abstract

The embodiment of the utility model discloses a water quality detection circuit of a humidifier. The water quality detection circuit comprises a power supply input interface for supplying power; the infrared emission circuit is used for emitting infrared light to water in the humidifier water tank; the infrared receiving circuit is used for receiving the reflected light and converting an optical signal into an electric signal; the operational amplification circuit is used for amplifying the electric signal; and the MCU is used for detecting the amplified electric signal. The service life of the device can be prolonged, and the device is not in contact with a water source, so that water source pollution can be prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to humidifier technical field especially relates to a humidifier water quality detection circuit. BACKGROUND

[0002] The traditional humidifier detects water quality mostly through setting electrode in the humidifier water tank, measures the water resistance to judge the water quality contamination degree. The more polluted the water quality is, the lower the resistance is, so as to judge the water quality contamination degree.

[0003] However, the electrode is soaked in water for a long time, with the use time, the electrode service life is shortened, and the electrode pollution water source occurs, which causes the risk of threatening human health. UTILITY MODEL CONTENT

[0004] The utility model embodiment solves the technical problem that provides a humidifier water quality detection circuit to improve the service life and prevent the pollution water source.

[0005] In order to solve the above technical problem, the utility model embodiment provides a humidifier water quality detection circuit, which comprises:

[0006] The power input interface for power supply;

[0007] The infrared emission circuit for emitting infrared light to the water in the humidifier water tank;

[0008] The infrared receiving circuit for receiving reflected light and converting optical signal into electrical signal;

[0009] The operational amplifier circuit for amplifying electrical signal;And

[0010] The MCU for detecting amplified electrical signal;

[0011] Among them, the MCU is electrically connected with the infrared emission circuit and the operational amplifier circuit, the power input interface is electrically connected with the infrared emission circuit, the infrared receiving circuit, the operational amplifier circuit MCU, and the infrared receiving circuit is electrically connected with the operational amplifier circuit.

[0012] Further, the operational amplifier circuit includes an operational amplifier, a first resistor and a second resistor, the signal output end and the signal input end of the operational amplifier are connected respectively at both ends of the first resistor, the signal output end of the operational amplifier is connected with the MCU, and the signal input end of the operational amplifier is connected with the infrared receiving circuit through the second resistor.

[0013] Further, the infrared receiving circuit is composed of a photodiode and two resistors, one end of the photodiode is connected with the positive pole of the power input interface, and the other end is connected with the negative pole of the power input interface and the operational amplifier circuit through two resistors respectively.

[0014] Further, the infrared emission circuit is composed of an infrared emission tube, a triode and three resistors, the infrared emission tube is connected with one resistor in series, the collector of the triode is connected with the positive pole of the power input interface through the infrared emission tube and the series resistor, the base of the triode is connected with the emitter of the triode through the remaining two resistors and the MCU respectively, and the emitter of the triode is connected with the negative pole of the power input interface.

[0015] Further, the digital tube is electrically connected with the MCU.

[0016] Further, the infrared emission circuit and the infrared receiving circuit have multiple groups.

[0017] The device has the advantages that: the device can prolong the service life of the device, and has no contact with the water source, thereby preventing the water source from being polluted. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure schematic view of the humidifier water quality detection circuit of the embodiment of the utility model.

[0019] Figure 2 is the first stage schematic view of the MCU of the embodiment of the utility model.

[0020] Figure 3 is the circuit diagram of the power input interface of the embodiment of the utility model.

[0021] Figure 4 is the circuit diagram of the infrared emission circuit of the embodiment of the utility model.

[0022] Figure 5 is the circuit diagram of the infrared receiving circuit of the embodiment of the utility model.

[0023] Figure 6 is the circuit diagram of the operational amplifier circuit of the embodiment of the utility model.

[0024] Figure 7 is the circuit diagram of the digital tube of the embodiment of the utility model. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict, and the utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0026] In the embodiment of the utility model, the directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications also change accordingly.

[0027] In addition, in the utility model, if the description of "first", "second" and the like is only used for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features.

[0028] Please refer to Figures 1-7 The humidifier water quality detection circuit of the utility model embodiment comprises a power input interface, an infrared emission circuit, an infrared receiving circuit, an operational amplifier circuit and an MCU.

[0029] The power input interface is electrically connected with the infrared emission circuit, the infrared receiving circuit, the operational amplifier circuit and the MCU. The utility model supplies power for the whole humidifier water quality detection circuit through the power input interface.

[0030] The infrared emission circuit is used for emitting infrared light to the water in the humidifier water tank. The infrared receiving circuit receives the reflected light and converts the optical signal into an electrical signal. The infrared receiving circuit is electrically connected with the operational amplifier circuit. The operational amplifier circuit is used for amplifying the electrical signal converted by the infrared receiving circuit.

[0031] The MCU is electrically connected with the infrared emission circuit and the operational amplifier circuit. The MCU is used for detecting the amplified electrical signal.

[0032] As an implementation mode, the operational amplifier circuit comprises an operational amplifier, a first resistor (i.e. Figure 6 R4 and R7 in the formula) and a second resistor (i.e. Figure 6 R8 and R9 in the formula), the signal output end and the signal input end of the operational amplifier are respectively connected at both ends of the first resistor, the signal output end of the operational amplifier is connected with the MCU, and the signal input end of the operational amplifier is connected with the infrared receiving circuit through the second resistor (the amplification multiple can be adjusted by adjusting the resistance values of the first resistor and the second resistor, i.e. by adjusting the resistors R4 and R8 in the formula). Figure 6

[0033] As an implementation mode, the infrared receiving circuit comprises a photodiode and two resistors (i.e. Figure 5 R2 and R6 in the formula, Figure 5 The infrared receiving circuit has two groups, and the other two resistors are R19 and R22. One end of the photodiode is connected with the positive electrode of the power input interface, and the other end is connected with the negative electrode of the power input interface and the operational amplifier circuit through the two resistors.

[0034] As an implementation mode, the infrared emission circuit comprises an infrared emission tube, a triode and three resistors (i.e. Figure 4 R1, R3 and R5 in the formula, Figure 4 ​The infrared emission circuit has two groups, and the other group is composed of three resistors R18, R20 and R21, the infrared emission tube is connected with one of the resistors in series, the collector of the triode is connected with the positive pole of the power input interface through the infrared emission tube and the connected resistor, the base of the triode is connected with the emitter of the triode through the remaining two resistors and the MCU respectively, and the emitter of the triode is connected with the negative pole of the power input interface.

[0035] The utility model discloses a infrared emission tube emits light to water, utilizes photodiode to receive reflected or direct light (if reflection, infrared emission tube and photodiode are arranged in the same side, if direct, infrared emission tube and photodiode are arranged in the opposite side), converts light signal into electric signal, and then judges water quality contamination degree.

[0036] As an implementation mode, the humidifier water quality detection circuit further comprises a digital tube, and the digital tube is electrically connected with the MCU.

[0037] As an implementation mode, the infrared emission circuit and the infrared receiving circuit have multiple paths. Taking single-path detection as an example, the IR-1 network outputs a high level, so that the Q1 triode is turned on, and the LED1 infrared emission tube starts to work. After the LED2 photodiode receives the light reflected by the LED1 infrared emission tube, the light is converted into an electric signal, the weak electric signal is converted into a high or low level or an analog signal recognizable by the MCU through an operational amplifier. The MCU can detect the water source contamination degree through the amplified signal. The cleaner the water source is, the stronger the signal received by the LED2 photodiode is, and vice versa.

[0038] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalent ranges.

Claims

1. A humidifier water quality detection circuit, characterized by, The utility model relates to a humidifier, including: a power input interface for power supply; an infrared emission circuit for emitting infrared light to water in a humidifier water tank; an infrared receiving circuit for receiving reflected light and converting optical signals into electrical signals; an operational amplifier circuit for amplifying electrical signals; and an MCU for detecting amplified electrical signals; wherein the MCU is electrically connected to the infrared emission circuit and the operational amplifier circuit, the power input interface is electrically connected to the infrared emission circuit, the infrared receiving circuit, the operational amplifier circuit and the MCU, and the infrared receiving circuit is electrically connected to the operational amplifier circuit.

2. The humidifier water quality detection circuit of claim 1, wherein, The operational amplifier circuit comprises an operational amplifier, a first resistor and a second resistor, the first resistor is connected to the signal output end and the signal input end of the operational amplifier respectively, the signal output end of the operational amplifier is connected to the MCU, and the signal input end of the operational amplifier is connected to the infrared receiving circuit through the second resistor.

3. The humidifier water quality detection circuit of claim 1, wherein, The infrared receiving circuit is composed of a photodiode and two resistors, one end of the photodiode is connected to the positive pole of the power input interface, and the other end is connected to the negative pole of the power input interface and the operational amplifier circuit through the two resistors respectively.

4. The humidifier water quality detection circuit of claim 1, wherein, The infrared emission circuit is composed of an infrared emission tube, a triode and three resistors, the infrared emission tube is connected in series with one of the resistors, the collector of the triode is connected to the positive pole of the power input interface through the infrared emission tube and the series-connected resistor, the base of the triode is connected to the emitter of the triode and the MCU through the remaining two resistors respectively, and the emitter of the triode is connected to the negative pole of the power input interface.

5. The humidifier water quality detection circuit of claim 1, wherein, The utility model further comprises a digital tube, which is electrically connected to the MCU.

6. The humidifier water quality detection circuit of claim 1, wherein, There are multiple groups of infrared emission circuits and infrared receiving circuits.

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