Control circuit of plasma hand dryer

Abstract

The utility model discloses a control circuit of a plasma hand dryer, which comprises an induction board, a control board and a connection mainboard, the induction board is connected with the control board through an electric wire, the control board is connected with the connection mainboard through an electric wire, the control board comprises a first MCU (Microprogrammed Control Unit), and the first MCU is connected with the connection mainboard through an electric wire. The touch key processing module is used for processing input touch signals, driving corresponding indicator lights to be lightened and outputting the signals to the first MCU, and the touch key module comprises four touch keys. The utility model has the advantage of integrated linkage of a plurality of functions.

Description

Technical Field

[0001] The utility model relates to the field of hand dryer circuit structures, in particular to a control circuit of a plasma hand dryer. Background Art

[0002] Many high-end places now have hand dryers installed in their restrooms. Just place your hands under the hand dryer and it will automatically sense the air and start blowing. Although this type of hand dryer greatly facilitates people, most hand dryers on the market are controlled by relays. The internal control circuit is composed of multiple independently operated modules and lacks integrated linkage, so there is room for improvement. Utility Model Content

[0003] The purpose of the present invention is to provide a control circuit for a plasma hand dryer to solve the problems raised in the above-mentioned background technology, which has the advantage of integrating and linking multiple functions.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A control circuit for a plasma hand dryer, comprising a sensor board, a control board, and a connecting main board, wherein the sensor board is connected to the control board via wires, and the control board is connected to the connecting main board via wires, wherein the control board comprises a first MCU, a touch key module, and a touch key processing module for processing input touch signals, driving corresponding indicator lights to light up, and outputting signals to the first MCU, wherein the touch key module comprises four touch keys.

[0005] By adopting the above technical solution, the sensing plate is used to sense whether there is a hand under the hand dryer. After sensing the presence of a hand, the sensing plate transmits a signal to the control board, and the control board then controls the startup of the connection main board. In this process, the touch signal can be input through the touch button module and then processed by the touch button processing module. The processed touch signal is then sent to the first MCU for subsequent processing, and then transmitted to the connection main board for subsequent processing. The connection main board is used to start or shut down the hand dryer, and the touch button processing is used to process the input touch signal, drive the corresponding indicator light to light up and output it to the first MCU.

[0006] As a further solution of the present invention: the induction board is provided with an infrared receiving photoelectric transistor, an infrared emitting diode, a blue-green two-color light emitting diode and a potentiometer.

[0007] By adopting the above technical solution, the infrared emitting diode emits 20Hz pulsed infrared light. When encountering an external obstruction in front, the infrared light is reflected back and received by the infrared phototransistor, which converts the optical signal into an electrical signal, amplifies it, and transmits it to the MCU through the interface line. The potentiometer on the board can set the intensity of the electrical signal converted from the received light. The MCU calculates the distance to the obstruction, that is, the sensing distance, based on the size of the signal. If the sensing distance is small, the green LED will light up regularly, otherwise the blue LED will light up.

[0008] As a further solution of the present invention: the control panel also includes an interface, an LCD display and an LED indicator.

[0009] By adopting the above technical solution, the interface is used to receive external transmission signals and power supply, the LCD screen is used to display the hand drying animation, the touch button is used to input the touch control signal, and the LED indicator is used to display the power switch, heating switch, high and low gears, and plasma working status.

[0010] Preferably, the connecting mainboard is a brushed mainboard or a brushless mainboard;

[0011] The brushed main board includes a first power supply, a first control board interface, a first induction board interface, a second MCU, a first plasma generator fan drive and a first motor heating drive.

[0012] Preferably, the brushless mainboard includes a second power supply, a motor drive, a third MCU, a second induction board interface, a second control board interface, a heater, and a negative ion generator fan drive.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The sensing plate is used to sense whether there is a hand under the hand dryer. After sensing the presence of a hand, the sensing plate transmits a signal to the control board, which then controls the startup of the connection main board. During this process, the touch signal can be input through the touch button module and then processed by the touch button processing module. The processed touch signal is then sent to the first MCU for subsequent processing, and then transmitted to the connection main board for subsequent processing. The connection main board is used to start or shut down the hand dryer, and the touch button processing is used to process the input touch signal, drive the corresponding indicator light to light up, and output it to the first MCU. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the display screen in the embodiment;

[0016] Figure 2 A schematic diagram of the structure of a brushed motherboard is used for connecting the motherboard;

[0017] Figure 3A schematic diagram of the structure of a brushless motherboard selected for connection to the motherboard;

[0018] Figure 4 This is a schematic diagram of the induction plate in the embodiment;

[0019] Figure 5 This is the schematic diagram of the control board;

[0020] Figure 6 This is the schematic diagram of the brushed motherboard;

[0021] Figure 7 This is the schematic diagram of the brushless motherboard. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the embodiment of the present utility model,

[0024] A control circuit for a plasma hand dryer includes an induction board, a control board, and a connection main board. The induction board is connected to the control board via wires, and the control board is connected to the connection main board via wires.

[0025] The control board includes a first MCU, a touch key module and a touch key processing module that processes input touch signals and drives corresponding indicator lights to light up and outputs to the first MCU.

[0026] The touch button module includes four touch buttons.

[0027] The induction board is provided with an infrared receiving photoelectric triode, an infrared emitting diode, a blue-green two-color light emitting diode and a potentiometer.

[0028] The control panel also includes an interface, an LCD display and an LED indicator.

[0029] The connecting mainboard is a brushed mainboard or a brushless mainboard;

[0030] The brushed main board includes a first power supply, a first control board interface, a first induction board interface, a second MCU, a first plasma generator fan drive and a first motor heating drive.

[0031] The brushless mainboard includes a second power supply, a motor driver, a third MCU, a second induction board interface, a second control board interface, a heater, and a negative ion generator fan driver.

[0032] The control board is also provided with an interface for receiving external transmission signals and power supply;

[0033] The 1st and 6th pins of the interface input 5V power supply positive and negative, and the 2nd pin communicates with the motherboard status in TTL level.

[0034] Pin 3 is connected to output the heater switch signal, pin 4 is connected to the plasma working switch signal, and pin 5 sets the motor speed high and low level output.

[0035] The first MCU processes signal logic to drive the LCD display, receiving touch signals, turning the device on and off, and outputting control signals to the connected motherboard for power on / off and function indication. The LCD display can also display a hand-drying animation.

[0036] LCD display: Displays a hand-drying animation. The LCD screen displays a hand-drying animation. The S1-S5 pins of the LCD display are divided by two external resistors R17-R30 and inverted by the MCU's GPIO pin level to load an AC voltage to display the pattern. R24, Q1, and R31 drive the LCD screen's backlight to turn on and off.

[0037] Pin 1 of the first MCU is connected to LCD_COM, and pins 2, 3, 18, 19, and 20 are connected to S1-S5 of the LCD.

[0038] Pin 4 is connected to the power on / off LED indicator, pin 13 inputs the touch power on / off information, pin 16 outputs the LCD backlight control signal, and pin 17 is the status signal line for communication with the motherboard.

[0039] Touch button: input touch control signal.

[0040] The four touch buttons TK1-K4 input touch signals to the 9, 10, 11, and 13 pins of the processing chip PMS164.

[0041] TK1 is the power switch for the whole device. Touch it for 1 second to turn it on, and touch it for 3 seconds to turn it off.

[0042] TK2 is the heater switch function.

[0043] TK3 is the motor speed setting high and low gear.

[0044] TK4 is the switch of the plasma generator.

[0045] LED indicator light: indicates power switch, heating switch, high and low gear, and plasma working status.

[0046] LED1 lights up green when the power is on and goes out when the power is on.

[0047] LED2 is red and green, it lights up red when the heater is on and lights up green when the heater is off

[0048] LED3 is blue and green, it lights up green at high speed and blue at low speed.

[0049] LED4 lights up green when plasma is working and goes out when negative ions are turned off.

[0050] Touch button processing: Process the input touch signal, drive the corresponding indicator light to light up and output it to the first MCU:

[0051] Pin 1 outputs the speed (SPEED) setting level, high speed is low level, low speed is high level.

[0052] Pin 2 outputs the power on / off level, high level for power on and low level for power off.

[0053] Pin 3 is the plasma working switch signal, high level works, low level shuts down.

[0054] Pin 4 drives the plasma working status LED indicator light, which is low level when plasma is working and high level when it is turned off.

[0055] Pins 7 and 8 are high and low range LED indicators. High range: pin 7 is low level and pin 8 is high level. Low range: pin 7 is high level and pin 8 is low level.

[0056] 9-pin heater switch touch signal input.

[0057] Pin 10 power switch touch signal input.

[0058] Pin 11 is the isochronous switch touch signal input.

[0059] Pin 13 sets the touch signal input for high and low settings.

[0060] Pin 14 is the heating switch signal output. A high level turns on the heating, and a low level turns off the heating.

[0061] 15, 16 feet heater switch indication, when heating is on, 15 feet is low and 16 feet is high, when heating is off, 15 feet is high and 16 feet is low.

[0062] The brushed main board includes a first power supply, a first control board interface, a first induction board interface, a second MCU, a first plasma generator fan drive and a first motor heating drive.

[0063] Power supply 1: 220V AC power is connected to the mainboard through J3 and J4. It then passes through fuse F1 to prevent short circuits in the downstream stage. A common-mode filter formed by L1, C7, and C2 filters out common-mode interference before being input to transformer T1, converting the 220V AC voltage into 12V. This 12V voltage is rectified by a full-bridge rectifier composed of four diodes, D1-D4, through D5, and filtered by C3 and C4 to 12V DC, which powers the downstream stage. The 12V DC input is fed into the 78M05, and the output is 5V DC, which is filtered by C5 and C6 and then supplied to the downstream stage.

[0064] R8, R9, R1, R12, and Q1 form an AC220V50Hz zero-crossing detection circuit, which outputs to the external interrupt port of the MCU.

[0065] The first control board interface, pins 1 and 6 input 5V power supply positive and negative, pin 2 communicates with the mainboard status TTL level, pin 3 inputs the heater switch signal, pin 4 inputs the plasma working switch signal, and pin 5 sets the motor speed high and low level input.

[0066] Second MCU: Pin 1 is the infrared receiver signal input. Pins 2 and 6 are the sensor board LED on / off controls. Pin 3 is the temperature acquisition signal input, pin 4 is the infrared transmitter signal output, pin 5 is the 5V voltage supply, pin 7 is the speed setting information input, pin 8 is the plasma operation switch signal input, pin 9 is the motor drive output, pin 10 is the heater switch drive output, pin 11 is the AC zero-crossing signal input, pin 12 is the power ground, pin 13 is the heater switch signal input, pin 14 is the plasma generator switch drive output, pin 15 is the fan switch drive output, and pin 16 is the operating status signal.

[0067] The first sensor board interface: 1, 6 pins power input, 2 pin connected to R19, Q6, R18, the MCU infrared emission pulse signal output to the infrared emission tube on the sensor board for transmission, 3, 4 pins MCU controls the on and off of the LED on the sensor board, 5 pins inputs the infrared sensing signal on the sensor to the second MCU through C9, R20, R22, Q7.

[0068] First plasma generator fan drive: The drive signal from the second MCU drives T2 through R6, Q3, U4, R5, R4, and R3 to turn the plasma generator on and off. The drive signal from the MCU drives Q4 through R7 to turn the fan on and off.

[0069] First motor heater drive: The drive signal sent by the second MCU drives T3 through R17, Q5, R16, U3, R15, and R14 to realize the switching of the motor. The drive signal sent by the MCU drives JD2 through R2, Q2, and D6 to realize the switching of the heater.

[0070] The brushless mainboard includes a second power supply, a motor driver, a third MCU, a second induction board interface, a second control board interface, a heater, and a negative ion generator fan driver.

[0071] Secondary power supply: 220V AC power is connected to the mainboard via J1 and J4. It then passes through F1, a fuse that protects the downstream stage from short circuits. C1 filters out common-mode interference, and R59 NTC surge protectors deliver the power to D1 for rectification. This 220V AC power is then rectified by a full-bridge rectifier, filtered by CC14 to 310V DC, and then fed into the PN8054E and external circuits to deliver 15V DC power to the downstream stage. The 15V DC power is fed into the 78M05, and the 5V DC power output is filtered by C23 and C22 before being supplied to the downstream stage.

[0072] Second control board interface:

[0073] 1. Pin 6 inputs 5V power supply positive and negative,

[0074] Pin 2 communicates with the motherboard status via TTL level.

[0075] Pin 3 inputs the heater switch signal.

[0076] 4-pin plasma working switch signal,

[0077] Pin 5 sets the motor speed high and low level input

[0078] Second sensor board interface:

[0079] 1, 6-pin power input

[0080] The 2nd pin is connected to R34, Q5, and R35, which outputs the infrared emission pulse signal of the third MCU to the infrared emission tube on the sensor board.

[0081] The third MCU on pins 3 and 4 controls the on and off of the LED on the sensor board.

[0082] The infrared sensing signal on the sensor at pin 5 is input to the third MCU through C20, R37, R38, and 67.

[0083] Plasma generator fan drive:

[0084] The driving signal sent by the third MCU drives T1 through R23, Q2, U6, R18, R21, and R15 to realize the switching of the plasma generator.

[0085] The driving signal sent by the third MCU drives Q3 through R24 and R22 to turn the fan on and off.

[0086] Heater drive:

[0087] The driving signal sent by the third MCU drives JD1 through R9, Q4, and D2 to turn the heater on and off.

[0088] Third MCU:

[0089] Pin 1 plasma working switch signal input

[0090] Pin 2 motor drive output,

[0091] 3-pin motor driver IC Rest

[0092] 4-pin motor driver IC RD

[0093] 5-pin voltage supply 5V

[0094] 6-pin infrared emission signal output

[0095] 7-pin heater switch drive output speed setting information input

[0096] 8, 13 sensor board LED lighting and extinguishing control.

[0097] 9 Plasma generator switch drive output

[0098] 10-pin fan switch drive output

[0099] Pin 11: Infrared receiving signal input. AC zero-crossing signal input

[0100] Pin 12 power ground

[0101] Pin 14 is the temperature acquisition signal input

[0102] Pin 15 working status signal

[0103] 16-pin heater switch signal input

[0104] Motor drive:

[0105] The U2 module and the resistors and capacitors on the same side constitute the power drive of the BLDC motor. The six PWM drive signals output by the MCU are input to the module through R2-R7 and C4-C9. C10, C11, C13, C27, C35, and C36 form a voltage-doubler for internal use in the module. R12 and R13 sample the drive current and provide protection in the event of overcurrent.

[0106] J8 is the motor Hall interface. Three Hall signals are input to BTA103 through R28-R33 and C31-C33 to provide real-time position information of the motor.

[0107] The BTA103 outputs six PWM drive signals corresponding to the three Hall signals to the driver module. It also provides overcurrent protection based on the input current sampling value. The input speed pin voltage adjusts the output PWM pulse width to drive the motor at the set speed.

[0108] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A control circuit for a plasma hand dryer, characterized in that: The device comprises a sensing board, a control board and a connecting main board. The sensing board is connected to the control board via wires, and the control board is connected to the connecting main board via wires. The control board comprises a first MCU, a touch key module and a touch key processing module for processing input touch signals, driving corresponding indicator lights to light up, and outputting signals to the first MCU. The touch key module comprises four touch keys.

2. The control circuit of the plasma hand dryer according to claim 1, characterized in that: The induction board is provided with an infrared receiving photoelectric triode, an infrared emitting diode, a blue-green two-color light emitting diode and a potentiometer.

3. The control circuit of the plasma hand dryer according to claim 1, characterized in that: The control panel also includes an interface, an LCD display and an LED indicator.

4. The control circuit of the plasma hand dryer according to claim 1, characterized in that: The connection mainboard is a brushed mainboard or a brushless mainboard; the brushed mainboard includes a first power supply, a first control board interface, a first induction board interface, a second MCU, a first plasma generator fan drive and a first motor heating drive.

5. The control circuit of the plasma hand dryer according to claim 4, characterized in that: The brushless mainboard includes a second power supply, a motor driver, a third MCU, a second induction board interface, a second control board interface, a heater, and a negative ion generator fan driver.

Images