Dehumidifier control circuit

Abstract

The utility model relates to the field of dehumidifiers, in particular to a dehumidifier control circuit which comprises a power supply circuit, a main control circuit, a driving circuit and a plurality of loads, the main control circuit is used for being connected with a touch display panel of a dehumidifier, and the driving circuit comprises a driving chip and a plurality of switch pieces. The output end of the main control circuit is connected with the input end of the driving chip, each switching element is used for being connected to a power supply loop of each load, and the driving chip is used for controlling the switching elements to be switched on or switched off. The main control circuit and the driving circuit are connected with the power supply circuit, and the power supply circuit is used for supplying power to the main control circuit and the driving circuit. The circuit is simplified, so that the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dehumidifiers, in particular to a dehumidifier control circuit. BACKGROUND

[0002] A dehumidifier is used to reduce the moisture content in the air. The common dehumidifier adopts a compression refrigeration dehumidification technology, that is, to achieve the effect of dehumidification by refrigeration.

[0003] The existing dehumidifier needs multiple driving circuits to drive when driving loads such as compressors, high-speed fans and low-speed fans, which is complex in circuit, troublesome in wiring and high in cost. CONTENT OF THE INVENTION

[0004] In order to simplify the circuit and reduce the cost, the present application provides a dehumidifier control circuit.

[0005] The present application provides a dehumidifier control circuit, which adopts the following technical solution:

[0006] A dehumidifier control circuit, comprising a power supply circuit, a main control circuit, a driving circuit and a plurality of loads, the main control circuit is used to be connected with a touch display panel of the dehumidifier, the driving circuit comprises a driving chip and a plurality of switch elements, the output end of the main control circuit is connected with the input end of the driving chip, each of the switch elements is used to be connected in the power supply loop of each load, the driving chip is used to control the conduction or closing of the switch elements, and the main control circuit and the driving circuit are connected with the power supply circuit and the power supply circuit is used to supply power to the main control circuit and the driving circuit.

[0007] By adopting the above technical solution, the user outputs the control instruction through the touch display panel on the dehumidifier, the main control circuit outputs the signal after receiving the instruction, and the driving circuit controls the conduction or closing of the corresponding switch element after receiving the signal, so as to control the driving of the load, thereby simplifying the circuit and reducing the cost.

[0008] Preferably, the plurality of loads comprises a compressor, a high-speed fan and a low-speed fan, the switch element comprises a relay, one end of a coil of the relay is connected with an output pin of the driving chip, the other end of the coil of the relay is connected with an output end of the power supply circuit, one end of a normally open switch of the relay is connected with a power supply end of the compressor, the high-speed fan or the low-speed fan, and the other end of the normally open switch of the relay is used to be connected with a zero line.

[0009] By adopting the above technical solution, the relay can isolate the main control circuit and the load circuit, prevent the influence of the high-current load on the main control circuit, simplify the design of the main control circuit through the relay, enable the low-voltage signal to control the high-voltage load, and enable a single driving chip to independently control a plurality of loads, thereby improving flexibility and adjustability.

[0010] Preferably, the driving circuit further comprises a buzzer module, the buzzer module comprising a crystal triode and a buzzer, the base of the crystal triode being connected with the output pin of the driving chip, the emitter of the crystal triode being connected with the output end of the power supply circuit, and the buzzer being connected between the collector of the crystal triode and the output pin of the driving chip.

[0011] By adopting the above technical solution, the control signal is amplified by the crystal triode, which can provide sufficient current to drive the buzzer; the risk of overcurrent caused by directly connecting the buzzer is avoided, and the main control chip is protected; the crystal triode effectively isolates the buzzer current from the main control chip, improving the stability of the system.

[0012] Preferably, the main control circuit comprises a main control chip, the output pin of the main control chip being connected with the input pin of the driving chip, and the input pin of the main control chip being used for connecting with the touch display panel of the dehumidifier.

[0013] By adopting the above technical solution, the touch display panel as a user input interface is directly connected with the input pin of the main control chip, which can enable the main control chip to quickly acquire the control signal input by the user. This design simplifies the processing flow of the touch display panel signal, reduces the signal transmission path, and thus improves the response speed and stability.

[0014] Preferably, the display panel communication circuit further comprises a first wiring terminal, the first wiring terminal being used for connecting with the touch display panel, the first pin of the first wiring terminal being grounded, the second pin of the first wiring terminal being connected with the output end of the power supply circuit, the third pin of the first wiring terminal being connected with the input pin of the main control chip, and the fourth pin and the fifth pin of the first wiring terminal being respectively connected with the two output pins of the main control chip.

[0015] By adopting the above technical solution, the first wiring terminal is connected with the touch display panel, which facilitates the transmission of the input signal of the touch display panel to the display panel communication circuit, and reduces noise interference through grounding processing, ensuring the stability and accuracy of the signal; the second pin of the first wiring terminal is connected with the power supply circuit, ensuring that the display panel obtains stable power supply when working; the third pin of the first wiring terminal is connected with the input pin of the main control chip, enabling the main control chip to receive feedback information from the display panel; and the fourth pin and the fifth pin are respectively connected with the output pins of the main control chip, ensuring that the display panel can display the output state of the main control chip in real time, thereby realizing fast feedback and response.

[0016] Preferably, the temperature and humidity acquisition circuit further comprises a second terminal, the second terminal is used for connecting with a temperature and humidity sensor, a first pin of the second terminal is connected with an output pin of the master control chip, a second pin of the second terminal is connected with an input pin and an output pin of the master control chip, a third pin of the second terminal is connected with an input pin of the master control chip, a fourth pin of the second terminal is connected with an output end of the power supply circuit, and a filter capacitor is connected between the third pin and the fourth pin of the second terminal.

[0017] By adopting the above technical scheme, the temperature and humidity acquisition circuit is connected with the temperature and humidity sensor through the second terminal, so that the temperature and humidity data can be accurately acquired from the environment; the first pin of the second terminal is connected with the output pin of the master control chip, so that the master control chip can send a control signal to the temperature and humidity sensor; the second pin of the second terminal is connected with the input pin and the output pin of the master control chip, so that data can be effectively transmitted between the master control chip and the temperature and humidity sensor; the filter capacitor is connected between the third pin and the fourth pin of the second terminal, so as to play a filtering role. The filter capacitor can filter out high-frequency noise or other interference signals in the power supply circuit.

[0018] Preferably, the system further comprises a water fullness detection circuit, the water fullness detection circuit comprises a third terminal, the third terminal is used for connecting with a liquid level sensor, a first pin of the third terminal is connected with an output end of the power supply circuit and an input pin of the master control chip, and a second pin of the third terminal is grounded.

[0019] By adopting the above technical scheme, the first pin of the third terminal is connected with the output end of the power supply circuit, so that the liquid level sensor can obtain stable power supply; the first pin of the third terminal is also connected to the input pin of the master control chip, so that the water level signal detected by the liquid level sensor can be transmitted to the master control chip in real time; the second pin of the third terminal is grounded, so as to ensure the stability and safety of the circuit; by grounding the liquid level sensor and connecting it with the input pin of the master control chip, the system can better isolate electrical noise and interference signals.

[0020] Preferably, the system further comprises a WIFI communication circuit, the WIFI communication circuit comprises a fourth terminal, the fourth terminal is used for connecting with a WIFI module, a first pin of the fourth terminal is connected with an output end of the power supply circuit, a second pin of the fourth terminal is grounded, and a third pin and a fourth pin of the fourth terminal are respectively connected with an output pin and an input pin of the master control chip.

[0021] By adopting the technical scheme, the WIFI communication module can be integrated with other systems or devices conveniently through the standardized terminal design; the terminal design makes the wiring simple and reduces complex hardware connection; the third pin of the fourth terminal is connected with the output pin of the master control chip, and the fourth pin of the fourth terminal is connected with the input pin of the master control chip, so that the master control chip can communicate with the WIFI module bidirectionally.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] 1. The user outputs control instructions through the touch display panel on the dehumidifier, the master control circuit outputs signals after receiving the instructions, and the driving circuit controls the corresponding switch to be turned on or off after receiving the signals to control the driving of the load, thereby simplifying the circuit and reducing the cost;

[0024] 2. The control signal is amplified by the transistor, which can provide sufficient current to drive the buzzer; the transistor can avoid the risk of overcurrent caused by directly connecting the buzzer and protect the master control chip; the transistor effectively isolates the buzzer current from the master control chip, improving the system stability;

[0025] 3. The touch display panel is directly connected with the input pin of the master control chip as the user input interface, which can make the master control chip quickly acquire the control signal input by the user. This design simplifies the processing flow of the touch display panel signal, reduces the signal transmission path, and improves the response speed and stability. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural block diagram of an embodiment of the present application.

[0027] Figure 2 is a partial circuit principle diagram of an embodiment of the present application, mainly showing the power supply circuit.

[0028] Figure 3 is a partial circuit principle diagram of an embodiment of the present application, mainly showing the master control circuit.

[0029] Figure 4 is a partial circuit principle diagram of an embodiment of the present application, mainly showing the driving circuit.

[0030] Figure 5 is a partial circuit principle diagram of an embodiment of the present application, mainly showing the display panel communication circuit and the temperature and humidity acquisition circuit.

[0031] Figure 6 is a partial circuit principle diagram of an embodiment of the present application, mainly showing the water full detection circuit and the WIFI communication circuit.

[0032] Explanation of reference numerals in the attached diagram: 1. Power supply circuit; 2. Main control circuit; 3. Drive circuit; 4. Display board communication circuit; 5. Temperature and humidity acquisition circuit; 6. Water full detection circuit; 7. WIFI communication circuit; 8. Load. Detailed Implementation

[0033] The present application will be further described in detail below with reference to all the accompanying drawings.

[0034] This application discloses a dehumidifier control circuit. (Refer to...) Figure 1 , Figure 2 A dehumidifier control circuit includes a power supply circuit 1, a main control circuit 2, a drive circuit 3, and multiple loads 8. The main control circuit 2 is connected to the touch display panel of the dehumidifier. The main control circuit 2 drives the loads 8 through the drive circuit 3. The power supply circuit 1 is used to supply power to the main control circuit 2 and the drive circuit 3.

[0035] The power supply circuit 1 is used for providing 5V to each sub-module circuit, and the power supply circuit 1 comprises an AC power supply, a coil T1, a fuse FUSE1, a first chip DB1, a power supply chip U3, a first output interface and a second output interface. The AC power supply adopts 220V AC power and is connected by two AC power input plugs ACN and ACL. The fuse is a fuse wire, which is used to fuse when there is a short circuit or other faults in the circuit part. The ACN and the ACL are connected with a piezoresistor ZNR1, a capacitor CX1 and a series-connected resistor R17 and a resistor R20 in parallel. When the grid voltage is unstable and has a sharp voltage, or when there is a lightning in the thunderstorm weather, the piezoresistor can be broken down instantly, and the resistance is 0 ohm. The incoming voltage is directly formed into a loop through the FUSE1 and the ZNR1, and is directly short-circuited to burn the fuse, thereby ensuring the safety of the subsequent circuit. The first chip adopts a rectifier bridge chip. The first pin of the first chip is connected with the ACN through a resistor NR1. The second pin of the first chip is connected with the ACL. The third pin and the fourth pin of the first chip are connected with a first loop. The first loop comprises a π-type filter. The π-type filter comprises a first inductor L1, a third electrolytic capacitor EC3 and a fourth electrolytic capacitor EC4 connected in parallel, and a second inductor L2 connected with the first inductor in parallel. The first loop is connected with a second loop. The second loop comprises a series-connected resistor R18, a resistor R21, a first primary of the coil T1 and a diode D3. The second loop further comprises a capacitor C7 connected with the resistor R18 in parallel. The cathode of the diode D3 is also connected with the 5 / 6 / 7 / 8 pins of the power supply chip U3 at the same time. The power supply chip adopts a KP2161MSGA type chip. The 4 pin of the second primary of the coil T1 is grounded. The 3 pin of the second primary of the coil T1 is connected with a resistor R23 and a resistor R24 in parallel at the same time. The other end of the resistor R24 is connected with the ground through a resistor 25. The power supply FB is connected between the resistor R24 and the resistor R25. The resistor 25 is connected with a capacitor C10 in parallel. The other end of the resistor R23 is connected with a diode D4. The cathode of the diode D4 is connected with the 1 / 2 / 4 pins of the power supply chip U3. The cathode of the diode D4 is connected with the electrolytic capacitor EC5 between the 2 pin of the power supply chip U3. The 1 / 2 of the power supply chip U3 is connected with a capacitor C9.

[0036] The secondary connection of the coil T1 is connected with a third loop, the third loop comprises a first diode D1, a second diode D2, a second electrolytic capacitor EC2, an eighth capacitor C8 and a resistor R22, the first diode D1 and the second diode D2 are connected in parallel with each other, the first diode D1 is connected in parallel with a resistor R16 and a capacitor C6 connected in series with each other, the second electrolytic capacitor EC2, the eighth capacitor C8 and the resistor R22 are connected in parallel with each other, the anode of the first diode D1 is connected with the secondary connection of the coil T1, one end of the second electrolytic capacitor EC2, the eighth capacitor C8 and the resistor R22 is connected with the cathode of the first diode D1, the other end of the second electrolytic capacitor EC2, the eighth capacitor C8 and the resistor R22 is connected with the other end of the secondary connection of the coil T1, and the other end of the second electrolytic capacitor EC2, the eighth capacitor C8 and the resistor R22 is grounded, the first output interface and the second output interface are respectively located at two ends of the resistor R22, and the first output interface outputs a positive 5V, and the first output interface is grounded.

[0037] With reference to Figure 3 、 Figure 4 The main control circuit 2 comprises a main control chip U1, the VDD pin of the main control chip is connected with the first output interface of the power supply circuit 1 through the capacitor L4, the VSS pin of the main control chip is grounded through the capacitor L3, the main control chip adopts an SC92F8482M20U & SOP20 model chip, is responsible for general logic processing, receives the signals of the key board, the sensor interface and the mobile phone APP, and displays the corresponding working state and alarm information on the display board and the mobile phone APP after logic processing.

[0038] The driving circuit 3 comprises a driving chip and three switching elements, the switching elements are relays, the plurality of loads 8 are compressors, high-speed fans and low-speed fans, the 1 / 2 / 3 / 4 / 5 / 6 / 7 pins of the driving chip are connected with the output pins of the main control chip, the 2 end of the relay coil is connected with the output pin of the driving chip, the 1 end of the relay coil is connected with the output end of the power supply circuit 1 to receive +5V, the normally open switch 4 end of the relay is connected with the wiring terminal FAN1 and the COMP1 wiring port, the normally open switch 4 ends of the two relays are connected with the 1 pin and the 2 pin of the wiring terminal FAN1 respectively, the COMP1 wiring port is connected with the power supply end of the compressor, the wiring terminal FAN1 is connected with the power supply end of the high-speed fan and the low-speed fan, the 3 pin of the wiring terminal FAN1 is connected with the firewire, the normally open switch 3 end of the relay is used for being connected with the zero line, the driving circuit 3 further comprises a buzzer module, the buzzer module comprises a PNP crystal triode and a buzzer, the base of the crystal triode is connected with the output pin of the driving chip, the emitter of the crystal triode is connected with the output end of the power supply circuit 1, the buzzer is connected between the collector of the crystal triode and the output pin of the driving chip, the capacitor C3 is connected between the collector of the crystal triode and the buzzer, the driving chip is further connected with the UV lamp and the negative ion generator through the fifth wiring terminal CN5 and the sixth wiring terminal CN6.

[0039] With reference to Figure 3 、 Figure 5 The sub-module circuit further comprises a display panel communication circuit 4, the display panel communication circuit 4 is used for using a TM1628 communication mode, is responsible for receiving a key signal of a display panel and sending a corresponding display signal to the display panel, the display panel communication circuit 4 comprises a first wiring terminal CN1, the first wiring terminal is used for being connected with a touch display panel, the first pin of the first wiring terminal is grounded, the second pin of the first wiring terminal is connected with the output end of the power supply circuit, the third pin of the first wiring terminal is connected with the input pin of the main control chip through the resistance R3, the fourth pin and the fifth pin of the first wiring terminal are connected with two output pins of the main control chip through the resistance R7 and the resistance R10 respectively.

[0040] The sub-module circuit also includes a temperature and humidity acquisition circuit 5, which is used for AD detection and is responsible for acquiring the real-time temperature and humidity of the environment. The temperature and humidity acquisition circuit 5 includes a second terminal CN2, which is used to connect to the temperature and humidity sensor. The first pin of the second terminal is connected to the output pin of the main control chip. The second pin of the second terminal is connected to the input pin and output pin of the main control chip through resistors R1 and R6, respectively. The third pin of the second terminal is connected to the input pin of the main control chip through resistor R9. A resistor R11 and a filter capacitor are connected between the third pin of the second terminal and the input pin of the main control chip. The other end of resistor R11 is grounded. The fourth pin of the second terminal is connected to the output terminal +5V of the power supply circuit, and the other end of the filter capacitor is connected to +5V.

[0041] Reference Figure 3 , Figure 6 The sub-module circuit also includes a water full detection circuit 6, which is used for IO port detection to detect whether the water tank is full. If it is full, an alarm should be triggered and the operation should be stopped. The water full detection circuit 6 includes a third terminal CN3, which is used to connect to the liquid level sensor. The first pin of the third terminal is connected to the output terminal of the power supply circuit and the input pin of the main control chip through resistors R2 and R8, respectively. A capacitor C1 is connected between resistor R8 and the input pin of the main control chip, and the other end of capacitor C1 is grounded.

[0042] The sub-module circuit also includes a WIFI communication circuit 7. The WIFI communication circuit 7 includes a fourth terminal CN4, which is used to connect to the WIFI module. The first pin of the fourth terminal is connected to the output of the power supply circuit, the second pin is grounded, and the third and fourth pins are connected to the output and input pins of the main control chip, respectively. Furthermore, the third and fourth pins of the fourth terminal are connected to +5V via resistors R4 and R5, respectively. The main control chip receives operation commands from the mobile app and provides real-time feedback on the current operating status and alarm information through this module.

[0043] The implementation principle of a dehumidifier control circuit in this application embodiment is as follows: the user outputs control commands through the touch display panel on the dehumidifier, the main control circuit 2 receives the commands and outputs signals, and the drive circuit 3 receives the signals and controls the corresponding switches to turn on or off, so as to control the drive of the compressor, high-speed fan and low-speed fan, thereby simplifying the circuit and reducing costs.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dehumidifier control circuit, characterized in that: The device includes a power supply circuit (1), a main control circuit (2), a drive circuit (3), and multiple loads (8). The main control circuit (2) is used to connect to the touch display panel of the dehumidifier. The drive circuit (3) includes a drive chip and multiple switches. The output terminal of the main control circuit (2) is connected to the input terminal of the drive chip. Each switch is used to connect to the power supply circuit of each load (8). The drive chip is used to control the switching on or off. The main control circuit (2) and the drive circuit (3) are both connected to the power supply circuit (1), and the power supply circuit (1) is used to supply power to the main control circuit (2) and the drive circuit (3).

2. The dehumidifier control circuit according to claim 1, characterized in that: The multiple loads (8) include a compressor, a high-speed fan and a low-speed fan. The switching device includes a relay. One end of the relay coil is connected to the output pin of the drive chip. The other end of the relay coil is connected to the output terminal of the power supply circuit (1). One normally open switch of the relay is connected to the power supply terminal of the compressor, the high-speed fan or the low-speed fan. The other normally open switch of the relay is used to connect to the neutral wire.

3. The dehumidifier control circuit according to claim 1, characterized in that: The driving circuit (3) also includes a buzzer module, which includes a transistor and a buzzer. The base of the transistor is connected to the output pin of the driving chip, the emitter of the transistor is connected to the output terminal of the power supply circuit (1), and the buzzer is connected between the collector of the transistor and the output pin of the driving chip.

4. The dehumidifier control circuit according to claim 1, characterized in that: The main control circuit (2) includes a main control chip, the output pin of which is connected to the input pin of the driver chip, and the input pin of the main control chip is used to connect to the touch display panel of the dehumidifier.

5. A dehumidifier control circuit according to claim 4, characterized in that: It also includes a display panel communication circuit (4), which includes a first terminal block for connecting to the touch display panel. The first pin of the first terminal block is grounded, the second pin of the first terminal block is connected to the output terminal of the power supply circuit, the third pin of the first terminal block is connected to the input pin of the main control chip, and the fourth and fifth pins of the first terminal block are respectively connected to the two output pins of the main control chip.

6. A dehumidifier control circuit according to claim 4, characterized in that: It also includes a temperature and humidity acquisition circuit (5), which includes a second terminal block for connecting to a temperature and humidity sensor. The first pin of the second terminal block is connected to the output pin of the main control chip, the second pin of the second terminal block is connected to the input pin and the output pin of the main control chip, the third pin of the second terminal block is connected to the input pin of the main control chip, the fourth pin of the second terminal block is connected to the output terminal of the power supply circuit, and a filter capacitor is connected between the third pin and the fourth pin of the second terminal block.

7. A dehumidifier control circuit according to claim 4, characterized in that: It also includes a full water detection circuit (6), which includes a third terminal block for connecting to a liquid level sensor. The first pin of the third terminal block is connected to the output of the power supply circuit and the input pin of the main control chip, and the second pin of the third terminal block is grounded.

8. A dehumidifier control circuit according to claim 4, characterized in that: It also includes a WIFI communication circuit (7), which includes a fourth terminal block for connecting to the WIFI module. The first pin of the fourth terminal block is connected to the output of the power supply circuit, the second pin of the fourth terminal block is grounded, and the third and fourth pins of the fourth terminal block are respectively connected to the output pin and the input pin of the main control chip.

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