KR20030060563A - Contoller of hand dryer and the control method thereof - Google Patents

Abstract

PURPOSE: Apparatus and method for controlling a hand dryer is provided to dry hands within a short time. CONSTITUTION: When an infrared ray radiated from a human body is detected by an infrared detecting sensor(66) to be converted into a digital signal in an A/D converter(68) and input into a microprocessor(60), the microprocessor arithmetically processes the signal to output it to a motor driving unit(70) and drive a motor(120). Then, air is supplied to a heater(40) by a blast fan(120a), is heated and blown to wet hands to dry the hands. After a predetermined time after the drying of the hands, the current flowing in the heater is interrupted to blow cold air at the outside to the hands by the blast fan and dry the hands. The humidity of the air which dried the hands is detected by a humidity detecting sensor(110) to be converted into a digital signal and input into the microprocessor. If the humidity is lower than the preset one stored in a RAM(64), the driving of the motor is interrupted.

Description

Control device for hand dryer and its control method {CONTOLLER OF HAND DRYER AND THE CONTROL METHOD THEREOF}

The present invention relates to a control device for a hand dryer and a method of controlling the same, in particular, during the first predetermined time of drying hands, drying with warm hot air heated to a temperature of 18 to 65 ℃, humidity after a certain time is less than 50% It relates to a control device and a control method of the dryer that can be dried by cold air until it becomes.

Such a conventional hand drying apparatus is disclosed in Korean Patent Utility Model Publication No. 20-0180434, registered in Korea on February 17, 2000.

As shown in FIG. 1, the hand drying apparatus disclosed in the Utility Model Utility Model is provided with a drying chamber 2 having a suitable depth on the inclined surface of the upper portion of the main body 1, and a water drop passage at the lower end of the drying chamber 2; (3) is connected to the drip tray 4, and the upper and lower sides of the drying chamber 2 are provided with ducts 6 and 7 each having a plurality of air injection holes 5, respectively.

Then, the air supply pipe of the super strong high pressure blower (8) installed at the bottom of the main body (1) is formed by the Y-shaped pipes (9) and (10), and connected to the ducts (6) and (7), respectively, so that the high speed jet air It is sprayed to the yarn (5), one side of the drying chamber (2) by installing a sensor 12 connected to the control unit 11 to detect whether the input of the hand, UV and ozone generator (13) inside the drying chamber It is configured to disinfect hands by installing a.

In the conventional hand drying apparatus configured as described above, when the power switch 14 is turned on, each functional unit is turned on so that the ultraviolet lamp is turned on.

In this state, wash your hands with water and spread your hands deeply into the drying chamber (2). The sensor (12) detects this and sends a signal to the controller (11). Is supplied to the upper and lower injection holes (5) through the blower pipe and the duct (6) (7),

At this time, the high-pressure air hits both sides of the hand put into the drying chamber 2, that is, the back of the hand and palm at the same time, so that the water on the hand is removed in a moment (about 5-6 seconds) and dried, the hand in the drying chamber (2) When the drying is completed and the hand is removed from the drying chamber 2, the operation of the super blower 8 is immediately stopped by the signal of the detection sensor 12.

By the way, the conventional hand drying apparatus configured as described above is dried by the wind of a constant temperature blown by the blower 8 when the hand is placed in the drying chamber 2, and thus cannot be dried within a short time, There were problems such as being forced to judge by feeling.

In addition, the conventional hand-drying device has a problem that the blower motor is continuously driven when the obstacle or the human body is detected by the detection sensor, so that the blower motor frequently breaks down, shortening the life of the motor.

Accordingly, the present invention has been made in view of the above-mentioned various problems, and an object of the present invention is to provide a control device for a hand dryer and a control method thereof, which can dry hands within a short time.

Another object of the present invention is to dry with a warm hot air heated to a temperature of 18 to 65 ℃ during the first predetermined time to dry the hands, and after a certain period of time until the humidity of the air to dry the hands is less than 50% The present invention provides a control device for a hand dryer that can dry hands with air and a control method thereof.

It is another object of the present invention to provide a control device and a control method of the hand dryer which can be used for a long time by reducing the occurrence of failure.

In order to achieve the above object, the control device of the hand dryer of the present invention comprises a heater for heating air to dry hands, a power supply unit for receiving AC power and rectifying full-wave rectified by DC power, and outputting DC power, and infrared rays emitted from the human body. An infrared detection sensor for detecting a signal, an A / D converter for receiving an infrared signal (analog signal) detected by the infrared detection sensor, and converting the digital signal into a digital signal; A microprocessor which receives the digital signal output from the A / D converter and operates according to an execution program stored in a ROM (READ ONLY MEMORY) and stores the result in a RAM (RANDOM ACCESS MEMORY) and controls the overall operation; Motor driving means for receiving a control signal output from the processor to drive the motor to rotate the blowing fan, and the microprocessor A heater current applying means for receiving a control signal output from the controller and applying a current flowing to the heater, a heater current blocking means for blocking a flow of current flowing to the heater in response to a control signal output from the microprocessor, and the infrared detection Display means for receiving the light emission control signal output from the microprocessor to indicate the operation of the system when detecting the infrared radiation emitted from the human body by the sensor, and rotation of the blower fan linked to the drive of the motor to shut off the heater And a humidity detection sensor which detects the humidity of the air dried by blowing the air heated by the heater and outputs it to the A / D converter.

In addition, the control method of the hand dryer according to the present invention is an infrared radiation step of emitting infrared rays from the infrared sensor, and the wet hand located between the heater and the humidity detection sensor in the state that the infrared radiation is emitted to the infrared radiation infrared When the human body is detected by the detection sensor and the human body is detected by the human body detection determination step, the human body detection signal converted into a digital signal by the A / D converter is stored in a ROM that receives and processes the microprocessor. An operation step of performing an arithmetic processing according to an execution program, a display step of receiving a display control signal output from the microprocessor, and displaying a display means; a motor output from the microprocessor to supply air to the heater by rotating a blower fan. A motor for driving the motor by the motor driving means in response to the drive control signal A current is applied to the heater to heat the air supplied by the step and the blower fan driven in conjunction with the rotation of the motor by the motor driving step, thereby heating the air by the heat radiated from the heater and turning the hand into hot air. By a timer of the heater current blocking means to apply a current to the heater by the hot air drying step to dry and to receive a control signal output from the microprocessor and to cut off the current flowing to the heater after a predetermined time. A time-lapse determination step of determining whether a time counted by the timer of the heater current interrupting means has elapsed for a predetermined time (set time) has elapsed; When the time determined by the step has elapsed, the heater current cutoff number Heater that the stage timer is turned on and flows through the resistor to the relay coil so that the relay movable contact (p) provided between the primary coil of the down transformer and the heater is separated from the fixed contact q to cut off the current flowing to the heater. The humidity detection step for detecting the humidity of the air dried by the humidity detection sensor after the heater current is cut off by the current blocking step and the heater current blocking step, and the humidity detected by the humidity detection step are RAM. The humidity judging step for judging by the microprocessor whether the humidity value is less than or equal to the preset humidity value and the humidity detected by the humidity detection step in the humidity judging step are determined to be below the humidity value preset in the RAM. In this case, it is characterized in that the motor stop step for stopping the motor.

1 is a longitudinal sectional view schematically showing a conventional hand dryer;

Figure 2 is a circuit diagram schematically showing a control device of the hand dryer according to an embodiment of the present invention,

3 is a flowchart schematically illustrating a method of controlling a control device of a hand dryer according to one embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

40: heater 50: power supply

52: full-wave rectifying means 60: microprocessor

62: ROM 64: RAM

66: infrared detection sensor 68: A / D converter

70: motor driving means 72: first photo triac

72a: light emitting diode 72b: light receiving triac

74: first triac 80: heater current applying means

82: second phototriac 82a: light emitting diode

82b: Light receiving triac 84: The second triac

90: heater current blocking means

92: timer 100: display means

110: humidity detection sensor 120: motor

120a: blower fan

Hereinafter, a control device for a hand dryer and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram schematically showing a control apparatus and a control method of the hand dryer according to an embodiment of the present invention.

As shown in Figure 2, the control device of the hand dryer according to an embodiment of the present invention, the control device of the hand dryer according to an embodiment of the present invention is a heater 40 for heating the air to dry the hand, and The power supply unit 50 receives the AC power and rectifies the DC power to output the DC power, an infrared detection sensor 66 for detecting infrared radiation emitted from the human body, and an infrared signal detected by the infrared detection sensor 66. A / D converter 68 for receiving (analog signals) and converting them into digital signals, and receiving and supplying DC power output from the power supply unit 50 to each element, and digitally output from the A / D converter 68. A microprocessor 60 which receives a signal and operates according to an execution program stored in a ROM 62 (READ ONLY MEMORY), stores the result in a RAM 64 (RANDOM ACCESS MEMORY), and controls the overall operation; Output from 60) In response to a control signal, the motor driving means 70 drives the motor 120 to rotate the blowing fan 120a, and receives a control signal output from the microprocessor 60 to apply a current flowing to the heater 40. A heater current applying means (80), a heater current blocking means (90) for receiving a control signal output from the microprocessor (60) and blocking the flow of current flowing in the heater (40), and the infrared detection sensor ( Display means 100 for displaying the operation of the system by receiving the light emission control signal output from the microprocessor 60 when the infrared ray emitted by the human body is detected by the light source; The air heated by the heater 40 is blown by the rotation of the blower fan 120a interlocked with the driving of the motor 120 to detect the humidity of the air dried by the hand, and output to the A / D converter 68. Humidity detection sensor (1 10).

The power supply unit 10 is connected to a down transformer T1 for dropping AC power at a constant level and a secondary coil of the down transformer T1 to propagate a voltage dropped at a predetermined level in the down transformer T1. Rectifying full-wave rectifying means 52, an output resistor R2 connected to the output terminal of the full-wave rectifying means 52, and a smoothing capacitor C1 for receiving and smoothing the DC voltage full-wave rectified by the full-wave rectifying means 52. It consists of).

The motor driving means 70 receives the motor driving control signal output from the microprocessor 60 through the resistor R2 and conducts the first photo triac 72 and the first photo triac 72. Resistor R3 for limiting the current flowing through the light receiving triac 72b and the gate signal when the first photo triac 72 is connected are conducted to apply AC power to the motor 120. The first triac 74 which is turned on to drive, and the resistor R4 which stabilizes the operation | movement of the said 1st triac 74 are comprised.

The heater current applying unit 80 receives the heater current application control signal output to the microprocessor 60 through the resistor R7 and conducts the second photo triac 82 and the second photo triac 82. A resistor R7 for limiting the current flowing through the light receiving triac 82b and the gate signal is applied when the second photo triac 82 is electrically connected to supply AC power to the heater 40. The second triac 84 is applied to radiate heat and the resistor R9 stabilizes the operation of the second triac 84.

The heater current blocking means 90 receives a control signal output from the microprocessor 60 and counts a time, and when the predetermined time is counted by the timer 92, the heater ( One end is connected to the resistor R5 so as to cut off the current flowing through the circuit 40, and the other side is grounded, and constitutes a relay coil RY1 through which current flows.

The display means 100 preferably uses a light emitting diode LED1 that receives the light emission control signal output from the microprocessor 60 through the resistor R6.

Next, a control method of the hand dryer according to the embodiment of the present invention configured as described above will be described.

3 is a flowchart schematically illustrating a method of controlling a hand dryer according to an embodiment of the present invention. In FIG. 3, S represents a step.

First, after washing the hand in the state in which the infrared ray sensor 66 emits infrared rays in step S1, if the hand with water is placed between the heater 40 and the humidity detection sensor 110, the radiation from the human body When the human body is detected (in the case of YES) by detecting whether the infrared ray is detected (human detection step) by the infrared sensor 66 (human detection step), the human body detection signal (analog signal) is A / It is input to the D converter 68 and is converted into a digital signal by the A / D converter 68 and output to the microprocessor 60.

In step S3, the digital signal converted by the A / D converter 68 is arithmetic processed (operation step) by the microprocessor 60 according to an execution program stored in the ROM 62, and stored in the RAM 64. In step S4, the display control signal is output to the display means 100, indicating that the control device of the hand dryer of the present invention is being driven (display means display step), and the process proceeds to step S5 to output the motor drive control signal to the motor drive means. Output to 70 to drive the motor 120 (motor drive step) to rotate the blowing fan 120a to supply air to the heater 40.

At this time, the motor driving control signal flows to the light emitting diode 72a of the first phototriac 72 through the resistor R2 of the motor driving means 70, so that the light emitting diode 72a emits light. As 72b) is conducted, the first phototriac 72 is turned on so that a current flows in the first phototriac 72 through the current limiting resistor R3 so that the motor 120 starts to be driven.

Subsequently, the process proceeds to step S6, where the heater current application control signal flows through the resistor R7 of the heater current application means 80 to the light emitting diode 80a of the second phototriac 80 so that the light emitting diode 80a emits light. As the light receiving triac 82b is conducted, the second phototriac 82 is conducted so that current flows through the current limiting resistor R8 to the second phototriac 82 to dissipate the heater 40. As it starts, the air supplied to the heater 40 is heated by the driving of the blower fan 120a and ejected toward the hand, thereby drying the hand (hot air drying drying step) with the heated air.

At the same time, the process proceeds to step S7 and receives the control signal output from the microprocessor 60 to cut off the heater current to the timer 92 of the heater current interrupting means 90, the timer 92 of the heater current interrupting means 90. Time is counted (time count step).

Next, the flow advances to step S8 to determine whether the time counted by the timer 92 has elapsed for a predetermined time (time elapsed discrimination step), and if the predetermined time has elapsed (YES), the process proceeds to step S9. Since the timer 92 is turned on so that a current flows through the resistor R5 to the relay coil RY1, the primary coil and the heater 40 of the down transformer T1 are connected to the magnetic force line of the relay coil RY1. The relay movable contact p, which is provided in between, separates the current flowing through the heater 40 away from the fixed contact q (heater current interruption step), thereby drying hands (cold wind drying step) by cold wind.

After that, the process proceeds to step S10, where the humidity detection sensor 110 detects the humidity of the air dried by the hand (humidity detection step) and outputs the result to the A / D converter 68. The A / D converter 68 In the present invention, the humidity detection signal, which is an analog signal, is converted into a digital signal and output to the microprocessor 60. The microprocessor 60 calculates and processes the signal in accordance with an execution program stored in the ROM 62 to store the RAM ( In the case where it is determined whether the humidity value is less than or equal to the humidity value stored in advance (humidity discrimination step), and it is determined that the humidity value is equal to or less than a predetermined value (YES), the process proceeds to step S11, and the microprocessor 60 sends the motor 120 to the microprocessor 60. Since the control signal for driving the LED is not output, the triac 72b is turned off because the light emitting diode 72a of the phototriac 72 does not emit light. At this time, the triac 74 is turned off to stop the motor 120. (Motor stop Tab) be a blowing fan (120a) it does not blow air. Therefore, even when the infrared sensor 66 detects the infrared radiation emitted from the human body, the control device of the hand dryer of the present invention does not operate, and thus the frequency of failure can be reduced by not operating excessively.

On the other hand, if the human body is not detected in the human body detection determination step (NO), the process returns to the infrared radiation step (step S1) that emits infrared rays, and repeats the operation of step S1 or less, and determines the time-lapse determination step (step). If the time set in S8 has not elapsed (NO), the flow returns to the time elapsed count step S8 and the operation of step S7 or less is repeated, and the humidity is determined by the RAM 64 in the humidity discrimination step S11. If the humidity value is not less than or equal to the previously stored humidity value (NO), the flow returns to the humidity detection step (step S10), and the operation of step S10 or less is repeated.

In the above description, of course, a photo coupler may be used instead of the first and second photo triacs 72 and 82.

In the above description, the specific embodiments have been shown and described, but the present invention is not limited thereto, for example, by those skilled in the art without departing from the concept of the present invention. Of course, the design can be changed in various ways.

As described above, according to the control device of the hand dryer of the present invention, when the infrared radiation emitted by the human body is detected by the infrared detection sensor, the A / D converter converts the digital signal and inputs it to the microprocessor. The motor is driven according to the output of the motor driving means, and the air is supplied to the heater by a blower fan linked to the driving of the motor, heated to blow the wet hand to dry the hand. Cooling outside air is blown out by blowing fan to dry the hand and the humidity of dry hand is detected by humidity sensor and converted into digital signal and input into micro processor and stored in RAM. It is configured to cut off the driving of the motor when it is below the set humidity. Not only can dry hands in a time, but also the first predetermined time to dry hands, drying with warm hot air heated to a temperature of 18 to 65 ℃, the humidity detected by the humidity sensor is less than 50% and If the timer stops counting, you can dry your hands with cold air at ambient temperature, and after a certain period of time, cut off the current flowing to the heater, and after a certain period of time, the humidity of the dry air is a certain value ( If it is less than 50%), it is configured to stop the operation of the motor, so it can be used for a long time by reducing the occurrence of failure.

Claims (6)

Heater 40 for heating the air to dry hands, a power supply unit 50 for receiving AC power and rectifying full-wave rectified by DC power and outputting DC power, and infrared detection sensor 66 for detecting infrared radiation emitted from the human body And an A / D converter 68 for receiving an infrared signal (analog signal) detected by the infrared detection sensor 66 and converting it into a digital signal, and receiving DC power output from the power supply unit 50 to each element. It receives the digital signal output from the A / D converter 68, calculates it according to the execution program stored in the ROM (READ ONLY MEMORY), and stores it in the RAM (64; RANDOM ACCESS MEMORY). A microprocessor 60 for controlling an operation, a motor driving means 70 for driving the motor 120 to rotate the blower fan 120a by receiving a control signal output from the microprocessor 60, and the microprocessor Output from 60 A heater current applying means (80) for receiving a signal and applying a current flowing through the heater (40), and receiving a control signal output from the microprocessor (60) to block the flow of current flowing through the heater (40) Display means for displaying the operation of the system by receiving a light emission control signal output from the microprocessor 60 when the infrared current emitted from the human body by the heater current blocking means 90 and the infrared detection sensor 66 is detected The air heated by the heater 40 is blown by the rotation of the blower fan 120a interlocked with the driving of the motor 120 to block the heater 40. And a humidity detection sensor (110) for detecting humidity and outputting the humidity to the A / D converter (68). According to claim 1, wherein the motor driving means 70 is a first photo triac 72 is conducted by receiving the motor drive control signal output from the microprocessor 60 through the resistor (R2), and the first The resistor R3 restricts the current flowing through the light receiving triac 72b of the phototriac 72 and a gate signal is applied when the first phototriac 72 is connected to the motor 120 to conduct the current. Control of a hand dryer comprising: a first triac 74 connected to drive AC power to drive the same; and a resistor R4 for stabilizing the operation of the first triac 74; Device. The method of claim 1, wherein the heater current blocking means (90) has received a control signal output from the microprocessor (60) and counts a time by the timer (92), In this case, the control device of the hand dryer, characterized in that the one side is connected to the resistor (R5) to cut off the current flowing in the heater (40) and the other side is grounded, the relay coil (RY1) through which current flows. The apparatus of claim 1, wherein the display means (100) is a light emitting diode (LED1) that receives light emission control signals output from the microprocessor (60) through a resistor (R6) and emits light. . The method of claim 1, wherein the heater current applying means 80 is a second photo triac 82 is connected to receive the heater current application control signal output from the microprocessor 60 through the resistor (R7), and A resistor R7 for limiting a current flowing through the light receiving triac 82b of the second photo triac 82 and a gate signal are applied when the second photo triac 82 is connected to the heater. And a resistor (R9) for stabilizing the operation of the second triac (84) and the second triac (84) to conduct heat to the AC power by applying the AC power. Control unit. An infrared radiation step for emitting infrared rays from the infrared sensor 66, A human body detection determination step of detecting a wet hand located between the heater 40 and the humidity detection sensor 110 by the infrared detection sensor 66 while the infrared radiation step is radiating the infrared radiation step; When the human body is detected at the human body detection determination step, the human body detection signal converted into a digital signal by the A / D converter 68 is received by the microprocessor 60 in an executable program stored in the ROM 62 for arithmetic processing. A calculation step for calculating A display step of receiving a display control signal output from the microprocessor 60 and displaying the display means 100; Motor drive for driving the motor 120 by the motor driving means 70 by receiving the motor drive control signal output from the microprocessor 60 to rotate the blowing fan 120a to supply air to the heater 40 Steps, The heat is radiated from the heater 40 by applying a current to the heater 40 so as to heat the air supplied by the driving of the blower fan 120a which is rotated in association with the rotation of the motor 120 by the motor driving step. A hot air drying step of heating the air and drying the hands with hot air; Heater current blocking means 90 to apply a current to the heater 40 by the hot air drying step and to block the current flowing to the heater 40 after a predetermined time by receiving a control signal output from the microprocessor 60. A time count step of counting time by the timer 92 of A time-lapse determination step of determining whether the time counted by the timer 92 of the heater current interrupting means 90 has elapsed for a predetermined time (set time) in the time counting step; When the time determined by the time elapse determination step has elapsed for a predetermined time, the timer 92 of the heater current interrupting means 90 is turned on and flows through the resistor R5 to the relay coil RY1 to flow down the transformer. A heater current interruption step of blocking a current flowing through the heater 40 from the relay movable contact p provided between the primary coil of T1 and the heater 40 to be separated from the fixed contact q; A humidity detection step of detecting humidity of air dried by the humidity detection sensor 110 after the heater current is cut off by the heater current blocking step; A humidity judging step of judging by the microprocessor 60 whether the humidity detected by the humidity detection step is equal to or less than a humidity value preset in the RAM 64; And a motor stop step of stopping the motor 120 when it is determined in the humidity discrimination step that the humidity detected by the humidity detection step is equal to or less than the humidity value preset in the RAM 64. Control method.