KR20030061955A - An apparatus for water exchange display of humidifier - Google Patents

Abstract

PURPOSE: An apparatus for indicating time for exchanging water of a humidifier is provided to indicate time for exchanging water of the humidifier with an inexpensive structure. CONSTITUTION: A guide(G) is installed on one side of a reservoir(13). A first infrared sensor and a second infrared sensor are attached on both sides of the reservoir centering on the guide to sense water level. The first infrared sensor and the second infrared sensor comprise light receiving parts(S1(b),S2(b)) and light emitting parts(S1(a),S2(a)). A float(B) is placed to move between the light receiving parts and the light emitting parts of the first infrared sensor and the second infrared sensor. A guide bar(T) is attached on an upper part of the float so that the guide bar moves between the light receiving parts and the light emitting parts. If the water level is middle so that the guide bar is placed between the first infrared sensor and the second infrared sensor, alarm signal or character/figure message is output to let a user know. If the water level is low so that light emitted from the light emitting part of the second infrared sensor reaches the light receiving part of the second infrared sensor, driving of a humidifier is stopped.

Description

An apparatus for water exchange display of humidifier

The present invention relates to a humidifier, and more particularly, to a water exchange time notification device of the humidifier for informing the user of the water exchange time of the humidifier.

In general, a humidifier is a device that sprays water vapor to maintain a dry indoor space at an appropriate humidity, a heated humidifier that evaporates and sprays water using a heater, and generates ultrasonic waves through a vibrator to convert water into fine particles. There is an ultrasonic humidifier to spray.

As shown in FIG. 1, the ultrasonic humidifier includes a main body 10, a bucket 30, a spray fine particle guide cylinder 37, and a lid 40.

Looking at the component, the main body 10 is formed with a water tank 13 for storing water on one side of the upper portion, while the bucket seat 15 is formed to seat the bucket on the other side, On the side is provided an intake port 17 through which air can be sucked, and an air discharge pipe 20 formed with an air discharge port.

In addition, a fan is installed inside the main body 10 so that the indoor air sucked through the inlet 17 may be blown through the air outlet 19, and the water tank 13 may be provided through the water channel 23. It is to hold the water to flow the water into the), the handle 33 is formed on the upper portion, the water inlet 35 is installed on the lower side and the scale is marked on one side to check the amount of stored water .

Then, the atomizing atom guide cylinder 37 guides the atomized water particles by the vibrator 21 attached to the bottom surface of the water tank 13 formed in the main body 10, the cover 40 guides the water bottle and the atomizing particles By covering the cylinder 37, the spray fine particle guide cylinder 37 is formed at the upper portion is connected to the spray fine particle guide cylinder 37 so that the water particles are discharged into the room,

Hereinafter, the humidification operation of the humidifier configured as described above will be described.

First, the user lifts off the cover 40 from the main body 10, then removes the water tank from the bucket seat 15 formed in the main body 10, and then exchanges water through the water inlet 35 of the water tank. Then, the bucket is mounted on the bucket seat 15 formed in the main body 10 again.

Accordingly, the water stored in the bucket is drained to the water inlet 35 flows into the water tank 13 having the vibrator 21 attached to the bottom through the water channel 23 formed in the upper portion of the main body 10.

Then, when the user inputs a humidifying command (for example, humidification amount, humidification time) through the key input unit and then enters a start key, the vibrator 21 and the fan 25 are driven according to the input humidifying command.

Accordingly, the water stored in the water tank 13 is atomized and bounced out by the ultrasonic vibration of the vibrator 21 installed on the bottom surface of the water tank 13, and at the same time, the suction port formed in the main body 10 by the rotation of the fan 25 ( 17 is blown through the air discharge port 19 of the air discharge pipe 20 into the atomizing atom guide cylinder 37, the water particles atomized by the blown air is sprayed fine particle guide cylinder 37 Passed through and discharged into the room through the atomizing spray nozzles installed in the upper portion of the cover 40 is humidified.

2 is a schematic control configuration diagram of a humidifier to which a device for notifying the water exchange time of the humidifier according to the related art is applied.

As shown in the drawing, the humidifier according to the related art includes a power supply unit 50 for supplying power to drive the humidifier, and a battery 55 for supplying power when the power failure occurs or when the power is cut off. And a water exchange time input unit 60 for inputting a water exchange time, a water bottle detection unit 65 for detecting whether the water tank is completely detached from the humidifier, and determining whether the water exchange time has elapsed to output an alarm control signal. The control unit 70, the vibrator driving unit 80 for driving the vibrator 21 to atomize the water, the drive fan driving unit 85 for transmitting power to drive the fan, and the user when the water exchange time And a display unit 90 displayed to inform in a figure, and an alarm generating unit 95 for notifying the user with an alarm signal when the water exchange time elapses.

The power supply unit 50 converts the commercial AC power provided from the outside into a DC voltage required for driving the humidifier and outputs the DC power to the control unit 70 and the drive unit, and the battery 55 is an auxiliary power supply unit. Power is supplied to the controller 70 so that the time exchanged with water is counted even if power is not output from 50.

Of course, the water exchange timing input unit 60 outputs an electric key signal corresponding to the water exchange timing desired by the user, and a function key for inputting the water exchange timing (for example, the user may press a key). 48 hours, 60 hours, 72 hours, 48 hours are set in turn) is provided, the bucket detection unit 65 is, as shown in Figure 1, the bucket seat 15 of the main body 10 It is installed on one side of the sensor and detects the detachment of the bucket and outputs a corresponding detection signal to the controller 70, which is composed of micro switches, etc., which is pressed when the bucket is seated, and when the bucket is removed, the bucket is detached. Detect.

The controller 70 receives the key signal, stores the water exchange time, initializes the stored water exchange time by receiving the detection signal, counts the water exchange time, and drive control signal. To the vibrator drive unit 80 and the fan drive unit 85 to drive the vibrator 21 and the fan 25, and the water exchange time by comparing the water exchange time is stored in the control unit 70 with the water exchange time is counted When it is determined that the water exchange time has elapsed, the stop control signal is output to the vibrator driver 80 and the fan driver 85 to stop the vibrator 21 and the fan 25, and the alarm control signal is output to the display unit 90. Output to the alarm generating unit 95, the water exchange message is displayed and an alarm is generated.

In addition, the vibrator driver 80 is driven by the drive control signal of the control unit 70 to drive the vibrator 21, and the fan drive unit 85 is driven by the drive control signal of the control unit 70 to the fan 25 Drive.

In addition, the display unit 90 displays the water exchange message by the alarm control signal of the control unit 70 as the alarm means, and displays the water exchange message by the alarm generating unit 95, and the alarm generating unit 95 generates the alarm. As a means, an alarm is generated by the alarm control signal of the control part 70.

The operation sequence of the water exchange time notification device of the humidifier according to the conventional invention configured as described above will be described with reference to the drawings.

3 is an operation control flow diagram illustrating an operation process for notifying the water exchange time of the humidifier according to the related art.

As shown in the drawing, the water exchange time notification device of the humidifier according to the prior art, the power supply unit 50 supplies power to the humidifier, the power supply unit 50 does not supply a commercial AC power supplied from the outside Otherwise, the battery 55 supplies the DC voltage to the controller 70, and the controller 70 receives the DC voltage to initialize the humidifier according to the humidification operation.

Next, when the user inputs the water exchange time through the water exchange time input unit 60 with a humidifier supplied with power, the water exchange time input unit 60 outputs a corresponding electric key signal to the controller 70. The controller 70 stores the water exchange time according to the key signal (step 100).

On the other hand, the user lifts off the cover 40 from the main body 10, and then removes the water tank from the bucket seat 15 formed in the main body 10, and then exchanges water through the water inlet 35 of the water tank Then, when the bucket is mounted on the bucket seat 15 formed in the main body 10 again, the bucket detector detects the detachment of the bucket by the water exchange and outputs a corresponding detection signal to the controller 70.

Therefore, the controller 70 determines whether the water is exchanged according to the detection signal (step 110). If it is determined that the water is not exchanged, the controller 70 continuously counts the time of water exchange, and if it is determined that the water is exchanged, After the stored water exchange time is initialized (step 120), the time of water exchange is counted (step 130).

Next, the control unit 70 inputs a start key through a key input unit (not shown), and the start key according to the key input unit (not shown) outputting a corresponding electric key signal to the control unit 70. It is determined whether the state is on (step 140). If it is determined that the start key is not in the ON state, it is determined whether or not the water exchange is performed, and the determination is made whether the start key is in the ON state while counting the time of the water exchange.

As a result of the determination of the step, when it is determined that the start key is in the on state, the control unit 70 outputs a drive control signal for driving the vibrator 21 and the fan to the vibrator driver 80 and the fan driver 85, The vibrator driver 80 and the fan driver 85 are driven by the drive control signal to drive the vibrator 21 and the fan 25 (step 150).

Accordingly, the water stored in the water tank 13 is bounced out by the ultrasonic vibration of the vibrator 21 installed on the bottom of the water tank 13 and suctioned through the suction port 17 formed in the main body 10 by the rotation of the fan. When the air is blown through the air discharge port 19 of the air discharge pipe 20 into the atomizing atom guide cylinder 37, the water particles atomized to the blown air passes through the atomizing atom guide cylinder 37 to cover (40). It is discharged into the room through the spray fine particle outlet installed in the upper part of the) and humidified (step 160).

Next, the controller 70 determines whether the time has passed the water exchange time in comparison with the counted water exchange time and the water exchange time, and if it is determined that the water exchanged time has not passed the water exchange time, the controller 70 Judges whether the water exchange has been carried out and counts the time of water exchange, and if the start key is on, the oscillator 21 and the fan 25 continue to be driven and whether the water exchanged time has passed the water exchange time. To judge.

As a result of the determination of the step, if it is determined that the water exchange time has passed the water exchange time, the control unit 70 sends a stop control signal for stopping the vibrator 21 and the fan 25, the vibrator drive unit 80 and the fan drive unit The oscillator 21 and the fan 25 are stopped by the stop control signal, and the vibrator driver 80 and the fan driver 85 are stopped (step 180).

The control unit 70 then outputs an alarm control signal to the display unit 90 and the alarm generating unit 95 to alert the water exchange time, and the display unit 90 displays the water exchange message by the alarm control signal. At the same time, the alarm generating unit 95 generates an alarm in response to the alarm control signal to warn the user of a water exchange time, and the humidification operation is terminated (step 190).

That is, the water exchange time notification device of the humidifier according to the prior art, as described above, if the control unit determines the water exchange time, when the water exchange is to be made according to the determination of the control unit, the alarm so that the user can recognize it The notification signal is output through the device and the display.

Therefore, in the control configuration of the humidifier according to the prior art, the control of the control unit is required to know the water exchange time. Such a controller uses a controller such as a conventional microcomputer, and the microcomputer is included in an expensive component.

Accordingly, as the controller is mounted in the control configuration of the humidifier, there is a problem in that the manufacturing cost increases in producing the humidifier due to the controller, which is an expensive control component.

It is therefore an object of the present invention to provide a water exchange time notification device for a humidifier capable of informing the water exchange time of the humidifier with an inexpensive control configuration.

1 is a perspective view of a humidifier according to the prior art.

Figure 2 is a control configuration for notifying the water exchange time of the humidifier according to the prior art.

Figure 3 is an operation control flow chart for notifying the water exchange time of the humidifier according to the prior art.

Figure 4 is a perspective view for informing the water exchange time of the humidifier according to the present invention.

Figure 5a, 5b is a circuit configuration configured to inform the water exchange time of the humidifier according to the present invention.

6 is an operation control flowchart for notifying the water exchange time of the humidifier according to the present invention.

Explanation of symbols on the main parts of the drawings

S1, S2: Infrared sensor OP AMP1,2: Operational Amplifier

SW1, SW2, SW3: Switch B: Sphere

a: light receiving portion b: light emitting portion

G: Guide 10: Body

13: water tank 15: bucket seat

17: suction port 19; Air outlet

20: air discharge pipe 21: vibrator

23: channel 25: fan

The water exchange time notification device of the humidifier according to the present invention for achieving the above object is a humidifier having a humidifier body that is driven and sprayed at the time of power supply, the mouth portion is changed according to the water level of the light emitting part and the light receiving part A first infrared sensor disposed to be positioned between the first infrared sensor, first comparison means for outputting a signal corresponding to a water level by comparing a value detected by the first infrared sensor with a reference value, and switched according to an output value of the first comparison means And first driving means and driving means driven to supply voltage to the humidifier main body when the first switching means is in an off state.

Looking in detail with respect to the humidifier according to the present invention as follows.

Figure 4 is a perspective view of the humidifier for notifying the water exchange time of the humidifier according to the present invention.

As shown in Figure 4, the humidifier according to the present invention, the guide (G) is installed on one side of the tank, the infrared sensor 1, 2 (S1, S2) for detecting the high / medium / low water level is guide ( It is attached to one side of both sides of the tank centered on G).

The infrared sensors 1 and 2 are provided with light receiving parts S1 (b) (S2 (b)) and light emitting parts S1 (a) and S2 (a), respectively, and the light emitting parts S1 (a). The light emitted by S2 (a) is detected by the light receiving units S1 (b) and S2 (b). At this time, in the present invention, the light emitting units S1 (a) and S2 (a) of the infrared sensor use a photodiode, and the light receiving units S1 (b) and S2 (b) of the infrared sensor are phototransistors. Use

As shown in the figure, between the light receiving units S1 (b) (S2 (b)) and the light emitting units S1 (a) and S2 (a) of each of the infrared sensors 1 and 2 (S1 and S2). The ball B is provided to pass, and the guide bar T is attached to the upper part of the ball B, and the guide bar T flows between the infrared sensors according to the position change of the ball B. .

If the water level is sufficient, as shown in the figure, the guide bar T of the mouth is located between the light receiving portion and the light emitting portion of the infrared sensor 1 (S1) for detecting the high water level, and the infrared sensor 1 (S1) The light output from the light emitting unit S1 (a) is blocked from reaching the light receiving unit S1 (b).

As shown in the figure, when the guide bar T of the sub-ball is located between the infrared sensor 1 (S1) and the infrared sensor 2 (S2), and outputs a signal indicating that the position is the middle water level, according to the signal It displays the alarm signal or text / graphic message to the user that the water exchange time has elapsed.

In addition, when the guide bar T of the sub-ball B is located at a low water level, the light emitted from the light emitting part S2 (a) of the infrared sensor 2 S2 reaches the light receiving part S2 (b). . As a result, the driving of the humidifier is stopped.

Looking at the circuit diagram for controlling the drive of the humidifier according to the water level position of the sub-ball (B) as follows.

5A is a control circuit diagram for driving control of a humidifier according to the water exchange time according to the present invention, and FIG. 5B is a control circuit diagram controlled to inform the water exchange time of the humidifier according to the present invention.

First, referring to the connection relationship of the circuit diagram of FIG. 5A, +5 V is applied to the photodiode S2 (a), which is a light emitting unit, and the photodiode S2 (a) is connected to the resistor 1 (R1). On the other hand, the optical signal of the photodiode S2 (a) is input to the base terminal of the phototransistor Q1 (S2 (b)), and + 5V is applied to the collector terminal of the phototransistor Q1. In addition, the collector terminal of the phototransistor Q1 is connected to the resistor 2 (R2), the resistor 2 (R2) is connected in series with the resistor 3 (R3), and the resistor 3 (R3) is grounded.

Meanwhile, between the resistor 2 (R2) and the resistor 3 (R3) is input to the negative terminal of the operational amplifier 1 (OP AMP1), the emitter terminal of the phototransistor Q1 is grounded. In addition, the emitter terminal of the phototransistor Q1 is connected to the (+) terminal of the operational amplifier 1 (OP AMP1).

The resistor 4 (R4) is connected to the output terminal of the operational amplifier 1 (OP AMP1), and the resistor 4 (R4) is connected to the base terminal of the transistor 2 (Q2). The collector terminal of transistor 2 (Q2) receives an applied voltage of 5V. The emitter terminal of transistor 2 (Q2) is grounded.

In addition, a relay RY that receives an applied voltage of 5 V is provided, and the relay RY is a contact-on relay, and always has an ON state. Accordingly, the switch SW is always closed to ON by the switching control of the relay RY, and the humidifier is driven by the switching operation of the switch SW. Therefore, the switch SW is always in the initial ON state, and the humidifier is driven by applying an AC power of 220V.

On the other hand, as shown in Figure 5b, + 5V is applied to the photodiode (S1 (a)) of the light emitting unit, the photodiode (S1 (a)) is connected to the resistor 1 '(R1'), the resistance 1 '(R1') is grounded. The optical signal output from the photodiode S1 (a) is input to the base terminal of the phototransistor Q3, and + 5V is applied to the collector terminal of the phototransistor Q3.

In addition, the collector terminal of the phototransistor Q3 is connected to the resistor 2 '(R2'), the resistor 2 '(R2') is connected in series with the resistor 3 '(R3'), and the resistor 3 '(R3'). ) Is grounded.

Meanwhile, between the resistor 2 '(R2') and the resistor 3 '(R3') is input to the negative terminal of the operational amplifier 2 (OP AMP2), the emitter terminal of the phototransistor Q3 is grounded. In addition, the emitter terminal of the phototransistor Q3 is connected to the (+) terminal of the operational amplifier 2 (OP AMP2).

A resistor 4 '(R4') is connected to the output terminal of the operational amplifier 2 (OP AMP2), and the resistor 4 '(R4') is connected to the base terminal of the transistor 4 (Q4). The collector terminal of the transistor 4 (Q4) is supplied with + 5V power, and the switch 2 (SW2) and the switch 3 (SW3) are connected to the emitter terminal of the transistor 4 (Q4). The switch 2 (SW2) is a switch for switching operation to select the display unit 90, the switch 3 (SW3) is a switch for switching operation so that the alarm signal is output.

With the circuit configuration connected as above, the operation of the circuit controlled as the control signal is input will be described as follows.

When the user inputs the humidifier driving signal, the humidifier is driven by the 220V power supplied at the same time. That is, to block all the light reaching the light receiving unit (S1 (b)) (S2 (b)) from the light emitting unit (S1 (a) (S2 (a)) of the infrared sensor 1, 2 (S1, S2). When the guide bar T is positioned at a high level, a humidifier to which power is applied is operated due to an ON switching operation of a relay which is always in a contact-on relay state.

On the other hand, when the guide bar T of the ball is located at the middle water level, the light output from the light emitting unit S1 (a) of the infrared sensor 1 S1 reaches the light receiving unit S1 (b). Accordingly, the light receiving unit S1 (b) senses light, and thus a high signal is transmitted from the photodiode S1 (a) to the base terminal of the phototransistors S1 (b) and Q3. The phototransistor Q3 transfers the signal to the operational amplifier 2 (OP AMP2), and the operational amplifier 2 (OP AMP2) receiving the signal amplifies the signal and transfers the signal to the base terminal of the transistor 4 (Q4). . At this time, the transistor 4 (Q4) receiving the high signal is switched to an ON state to supply the applied voltage + 5V to the switch 2 (SW2) and the switch 3 (SW3) side.

At this time, when the user selects the switch 3 (SW3) in the ON state in advance so that only the alarm signal is output, the signal passing through the transistor 4 (Q4) is the alarm device 95 through the switch 3 (SW3) Supplied to. The alarm device 95 generates an alarm signal by applying a voltage.

However, when the user selects the switch 2 (SW2) and the switch 3 (SW3) to the ON state so that the alarm signal and the text message is output at the same time, the voltage passing through the transistor 4 (Q4) is switched to the switch 2 (SW2). Supplied to the display unit 90, the message is displayed in a letter or a figure, and the alarm signal sounds to the user by the voltage supplied to the alarm device 95 through the switch 3 (SW3).

On the other hand, when the position of the guide bar T of the sub-ball B reaches or below the low water level, the light output from the light emitting part S2 (a) of the infrared sensor 2 S2 is received by the light receiving part S2 (b). As it arrives, the optical signal is detected. That is, a high signal is transmitted from the photodiode S2 (a) to the base terminal of the phototransistors S2 (b) and Q1. The phototransistor Q1 transfers the signal to the operational amplifier 1 (OP AMP1), and the operational amplifier 1 (OP AMP1) receiving the signal amplifies the signal and transfers the signal to the base terminal of the transistor 2 (Q2). . At this time, the transistor 2 (Q2) receiving the high signal is turned on and the applied voltage + 5V flows. At the same time, the switch of the relay RY is turned off and the relay ( RY) is stopped. Therefore, the switch SW is turned off and the driving of the humidifier is stopped.

As shown in FIG. 4 and FIGS. 5A and 5B, the operation process of the water exchange time notification device of the humidifier according to the present invention, which is controlled and configured, is as follows.

6 is a flowchart illustrating the operation of the water exchange time notification device of the humidifier according to the present invention.

As shown in the figure, when the user inputs a control signal through a key input unit (not shown) to operate the humidifier (step 200), the humidifier starts driving according to the control signal (step 210).

That is, the humidifier operates according to the user's driving signal input, and the water provided in the water tank is atomized and bounced out by the ultrasonic vibration of the vibrator 21 installed on the bottom of the water tank 13, and at the same time, When the air sucked through the suction port 17 formed in the main body 10 by the rotation is blown into the spray fine particle guide cylinder 37 through the air discharge port 19 of the air discharge pipe 20, atomized by the blown air The water particles are discharged into the room through the spray fine particle outlet through the spray fine particle guide cylinder 37 and installed at the upper portion of the cover 40 to be humidified.

In the operation of the humidifier as described above, the sub-ball (B) is provided through the guide formed on one side of the water tank (13). The float (B) in the floating state on the surface of the water, the humidifier is operated to atomize the water is discharged through the atomizing spray atomization, the water level is lowered. Therefore, as time elapses, as shown in FIG. 4, the ball B located at a high water level reaches a low water level due to a low water level.

If the guide bar T of the float B is located at a high water level (step 220), and is located between the light receiving portion and the light emitting portion of the infrared sensor 1 (S1), the contact point ON is caused by the float position. In operation 230, the humidifier operates as shown in the circuit of FIG.

However, when a predetermined time has elapsed since the humidifier is driven, the water in the tank is reduced and the position of the mouth ball B is also lowered at the same time. Therefore, the position of the guide bar T of the buoy is located between the infrared sensor 1 (S1) and the infrared sensor 2 (S2), that is, in the middle water level (step 240). In this case, the light emitting part of the infrared sensor 1 (S1) The optical signal output from S1 (a) reaches the light receiving portion S1 (b). Accordingly, the water exchange signal of the humidifier is displayed to the user through the circuit operation as shown in the circuit of FIG. 5B (S250).

Therefore, when the float (B) is located in the heavy water level, it is controlled to be output through the water exchange time notification device set by the user to exchange the water of the humidifier. That is, if the user inputs the switch before the humidification driving signal input so that the water exchange time is displayed on the alarm signal and the display unit 90 at the same time, when the sub-ball B reaches the low water level position, the character of the alarm signal or the display unit 90 / Print a message of the shape.

Then, when a predetermined long time has elapsed in the above state, the guide bar (T) of the float (B) reaches a low water level, passes through the infrared sensor 2 (S2) and descends below it (step 260). Accordingly, the light output from the light emitting units of the infrared sensors 1 and 2 is transferred to the light receiving unit. As a result, as described in the circuit operation of FIG. 5A, the driving of the relay is turned off, and the driving of the humidifier is stopped (step 270).

As described above, the present invention includes a separate infrared sensor for detecting the water exchange time to inform the user of the water exchange time of the humidifier, and outputs the water exchange time of the humidifier to the user according to the water level detected by the infrared sensor. Let it be a basic technical idea.

The light receiving unit and the light emitting unit of the infrared sensors 1 and 2 (S1 and S2) output signals according to the high water level, the medium water level, and the low water level according to the water level, and the humidifier is driven / driven stopped or notified according to the output signal. Allows display of signals / characters or figures.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and various modifications and adaptations can be made by those skilled in the art within the scope of the claims. It is self-evident.

Therefore, the present invention eliminates the need for expensive control parts for controlling the water exchange time of the humidifier. Moreover, it is comparatively simple compared with the control structure which concerns on the prior art. In addition, it is possible to implement a product function having the same performance as in the prior art without having the control component as described above.

Therefore, in mounting the device for notifying the water exchange time of the humidifier, by using an infrared sensor cheaper than the control component, it is possible to prevent the rise of the manufacturing cost, to produce a cheap product.

Accordingly, the user using the product can maximize the satisfaction with the product by using the humidifier according to the present invention that implements the same performance at a low cost.

Claims (5)

In the humidifier having a humidifier body that is driven and sprayed at the time of power supply, A first infrared sensor installed such that a float which is changed in position according to the water level is positioned between the light emitting portion and the light receiving portion; First comparing means for comparing a value detected by the first infrared sensor with a reference value and outputting a signal according to a water level; First switching means switched according to an output value of the first comparing means; And a driving means driven to supply voltage to the humidifier main body when the first switching means is in an off state. In the humidifier having a humidifier body that is driven and sprayed at the time of power supply, A first and second infrared sensors installed at different positions according to the height of the water, such that the float is positioned between the light emitting portion and the light receiving portion, and the heights are different from each other; First and second comparison means for outputting signals according to the high water level, the medium water level, and the low water level by comparing the values sensed by the first and second infrared sensors with a reference value; First and second switching means switched according to output values of the first and second comparison means; Drive means for supplying and driving a voltage to the humidifier main body when the first switching means is in an off state; And a notification means for generating a notification signal for informing the time of water replacement when the second switching means is in an on state. The method according to claim 1 or 2, The mouth is connected to the guide bar on the upper side, the water exchange time notification device of the humidifier, characterized in that whether the signal detection of the infrared sensor is determined according to the position of the guide bar. The method of claim 2, The notification means includes an alarm unit for generating an alarm signal; The water exchange time notification device of the humidifier comprising a display unit for generating a display signal. The method of claim 4, wherein A first switch connected between the second switching means and the alarm unit; Further comprising a second switch connected between the second switching means and the display, The first switch and the second switch is a water exchange notification device of the humidifier, characterized in that operated by the user selection.