Control circuit for controlling dehumidifier

Abstract

The utility model provides a control circuit for controlling a dehumidifier. Comprising a main control chip, a power supply circuit used for providing a power supply for a control circuit, a phase sequence and open-phase detection protection circuit, an interaction control circuit, an air valve air sweeping control circuit, a sensor circuit, a switch signal detection protection circuit, an external linkage voltage detection circuit, an RS485 networking control circuit and an EC motor air speed control circuit, the phase sequence and open-phase detection protection circuit, the interaction control circuit, the air valve air sweeping control circuit, the sensor circuit, the switching signal detection protection circuit, the external linkage voltage detection circuit, the RS485 networking control circuit and the EC motor air speed control circuit are respectively connected with the main control chip. Therefore, by applying the control circuit provided by the utility model to the dehumidifier, multiple functions can be realized, and the working efficiency of the dehumidifier is improved.

Description

Technical Field

[0001] This utility model relates to the field of smart homes, and in particular to a control circuit for controlling a dehumidifier. Background Technology

[0002] The control circuits used in existing dehumidifiers are generally designed based on simple microcontrollers, and therefore can only achieve simple functions such as adjusting power or airflow direction.

[0003] Therefore, the applications of this type of dehumidifier are extremely limited, making it difficult to meet user needs. Furthermore, its efficiency is low when used for dehumidification in various scenarios, including indoors and outdoors. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a control circuit for dehumidifier control, which can improve the working efficiency of dehumidifier.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A control circuit for controlling a dehumidifier, characterized in that it comprises: a main control chip, a power supply circuit for providing power to the control circuit, a phase sequence and phase loss detection and protection circuit, an interactive control circuit, a damper swing control circuit, a sensor circuit, a switch signal detection and protection circuit, an external linkage voltage detection circuit, an RS485 network control circuit, and an EC motor fan speed control circuit; the phase sequence and phase loss detection and protection circuit, the interactive control circuit, the damper swing control circuit, the sensor circuit, the switch signal detection and protection circuit, the external linkage voltage detection circuit, the RS485 network control circuit, and the EC motor fan speed control circuit are respectively connected to the main control chip; the first VSS pin of the main control chip is grounded, and the first VDD pin of the main control chip is grounded through a ninth capacitor; the main control chip... The first VDD pin of the chip is also connected to the power supply circuit to obtain a 3.3V power supply. The second VSS pin of the main control chip is grounded. The second VDD pin of the main control chip is grounded through the seventh capacitor. The second VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The third VDD pin of the main control chip is grounded through the nineteenth capacitor. The third VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The VSSA pin of the main control chip is grounded. The VDDA pin of the main control chip is connected to the power supply circuit. An eighth capacitor is connected between the VSSA pin and the VDDA pin of the main control chip. The BOOT0 pin of the main control chip is grounded through the third resistor.

[0007] In some possible implementations, the power supply circuit includes a fuse, a varistor, a safety capacitor, a discharge resistor, a common-mode inductor, a thermistor, an AC-DC 12V power module, a transient diode, a first electrolytic capacitor, a first capacitor, a first DC-DC step-down chip, a second DC-DC step-down chip, a second inductor, a first diode, a second electrolytic capacitor, a second capacitor, a third inductor, a second diode, a third electrolytic capacitor, and a third capacitor; one end of the varistor, the safety capacitor, and the discharge resistor is connected to the neutral terminal of the three-phase power system and is also connected to the fourth pin of the common-mode inductor; the other end of the varistor, the safety capacitor, and the discharge resistor is connected through the... The fuse is connected to phase C of the three-phase power system and also to the first pin of the common-mode inductor; the third pin of the common-mode inductor is connected to pin N of the AC-DC 12V power module, and the second pin of the common-mode inductor is connected to pin L of the AC-DC 12V power module through the thermistor. The third and fourth pins of the common-mode inductor are the two ends of the same coil in the common-mode inductor, and the first and second pins of the common-mode inductor are the two ends of another coil in the common-mode inductor. The negative pin of the AC-DC 12V power module is grounded, and the positive pin of the AC-DC 12V power module outputs 12V. The transient diode is connected between the negative and positive pins of the AC-DC 12V power module; the positive pin of the AC-DC 12V power module is connected to the VIN pin of the first DC-DC step-down chip, and the positive pin of the AC-DC 12V power module is also grounded through the first electrolytic capacitor, which is connected in parallel with the first electrolytic capacitor; the GND pin of the first DC-DC step-down chip is grounded, the ON_OFF pin of the first DC-DC step-down chip is grounded, and the OUT pin of the first DC-DC step-down chip is grounded through the first diode. The second inductor is connected to the VIN pin of the second DC-DC buck converter and outputs a 5V voltage. The OUT pin of the first DC-DC buck converter is grounded through the second electrolytic capacitor, and the second capacitor is connected in parallel with the second electrolytic capacitor. The FB pin of the first DC-DC buck converter is connected to the VIN pin of the second DC-DC buck converter. The GND pin of the second DC-DC buck converter is grounded, the ON_OFF pin of the second DC-DC buck converter is grounded, the OUT pin of the second DC-DC buck converter is grounded through the second diode, and the OUT pin of the second DC-DC buck converter outputs 3V through the third inductor.A 3V voltage is applied. The OUT pin of the second DC-DC step-down chip is grounded through the third electrolytic capacitor, which is connected in parallel. The FB pin of the second DC-DC step-down chip is connected to the positive terminal of the third electrolytic capacitor.

[0008] In some possible implementations, the phase sequence and phase loss detection protection circuit includes a 42nd step-down resistor, a 46th step-down resistor, a 40th pull-up resistor, a 45th pull-up resistor, a 43rd resistor, a 47th resistor, an 8th optocoupler, a 9th optocoupler, a 41st resistor, a 44th resistor, a 31st capacitor, and a 32nd capacitor; one end of the 42nd step-down resistor is connected to phase A of the three-phase power system, and the other end of the 42nd step-down resistor is connected to the first pin of the 8th optocoupler; one end of the 43rd resistor is connected to the neutral terminal of the three-phase power system, and the other end of the 43rd resistor is connected to the second pin of the 8th optocoupler; the third pin of the 8th optocoupler is grounded, and the fourth pin of the 8th optocoupler outputs a 3.3V voltage through the 40th pull-up resistor; the fourth pin of the 8th optocoupler outputs a 3.3V voltage through the 40th pull-up resistor. The forty-first resistor is connected to pin PA7 of the main control chip, and the fourth pin of the eighth optocoupler is grounded through the forty-first resistor and the thirty-first capacitor; one end of the forty-sixth step-down resistor is connected to phase B of the three-phase power system, and the other end of the forty-sixth step-down resistor is connected to the first pin of the ninth optocoupler; one end of the forty-seventh resistor is connected to the neutral terminal of the three-phase power system, and the other end of the forty-seventh resistor is connected to the second pin of the ninth optocoupler; the third pin of the ninth optocoupler is grounded, and the fourth pin of the ninth optocoupler outputs a 3.3V voltage through the forty-fifth pull-up resistor; the fourth pin of the ninth optocoupler is connected to pin PA6 of the main control chip through the forty-fourth resistor, and the fourth pin of the ninth optocoupler is grounded through the forty-fourth resistor and the thirty-second capacitor.

[0009] In some possible implementations, the interactive control circuit includes a compressor control circuit, a fan speed control circuit, an external linkage control circuit, and a control signal conversion circuit; the control signal conversion circuit includes a conversion chip and a tenth capacitor, pin E of the conversion chip is grounded, pin COM of the conversion chip is connected to a 12V voltage, pin COM of the conversion chip is grounded through the tenth capacitor, pin C1 of the conversion chip is connected to pin PB7 of the main control chip, pin C3 of the conversion chip is connected to pin PB5 of the main control chip, pin C4 of the conversion chip is connected to pin PB4 of the main control chip, and pin C5 of the conversion chip is connected to pin PB3 of the main control chip; the compressor control... The control circuit includes a compressor and a first relay; the compressor's pin CP1 is connected to the first pin of the first relay, the second pin of the first relay is connected to phase C of the three-phase power system, the third pin of the first relay outputs 12V voltage, and the fourth pin of the first relay is connected to pin B1 of the conversion chip. The first and second pins of the first relay are connected within the first relay via a trigger switch, and the third and fourth pins of the first relay are also connected within the first relay. The fan speed control circuit includes a third relay and a fourth relay; the first pin of the third relay is connected to the high-speed interface of the fan, and the second pin of the third relay is connected to the three-phase power system. In the C phase of the power system, the third pin of the third relay outputs a 12V voltage. The fourth pin of the third relay is connected to pin B4 of the conversion chip. The first pin of the fourth relay is connected to the low-end interface of the wind turbine. The second pin of the fourth relay is connected to the C phase of the three-phase power system. The third pin of the fourth relay outputs a 12V voltage and is connected to pin B3 of the conversion chip. The first and second pins of the third relay are connected within the third relay via a trigger switch. The third and fourth pins of the third relay are also connected within the third relay. The first and second pins of the fourth relay are connected within the fourth relay via a... The trigger switch is connected, and the third and fourth pins of the fourth relay are connected in the fourth relay; the external linkage control circuit includes a passive dry contact terminal block and a fifth relay; the passive dry contact terminal block includes at least a first terminal block, a second terminal block and a third terminal block, the normally open terminal of the fifth relay is connected to the first terminal block, the common terminal of the fifth relay is connected to the second terminal block, the normally closed terminal of the fifth relay is connected to the third terminal block, the first pin of the fifth relay outputs a 12V voltage, and the second pin of the fifth relay is connected to pin B5 of the conversion chip, wherein the first pin and the second pin of the fifth relay are connected in the fifth relay.

[0010] In some possible implementations, the air valve swing control circuit includes a thirteenth terminal block, an eleventh capacitor, and an air valve control signal conversion chip; the thirteenth terminal block includes a fourth terminal block, a fifth terminal block, a sixth terminal block, a seventh terminal block, and an eighth terminal block. The fourth terminal block is connected to pin C2 of the air valve control signal conversion chip, the fifth terminal block is connected to pin C3 of the air valve control signal conversion chip, the sixth terminal block is connected to pin C4 of the air valve control signal conversion chip, the seventh terminal block is connected to pin C5 of the air valve control signal conversion chip, and the eighth terminal block... The terminal is connected to the COM pin of the damper control signal conversion chip. The eighth terminal is connected to a 12V voltage and is grounded through the eleventh capacitor. The B2 pin of the damper control signal conversion chip is connected to the PB15 pin of the main control chip. The B3 pin of the damper control signal conversion chip is connected to the PB14 pin of the main control chip. The B4 pin of the damper control signal conversion chip is connected to the PB13 pin of the main control chip. The B5 pin of the damper control signal conversion chip is connected to the PB12 pin of the main control chip. The E pin of the damper control signal conversion chip is grounded.

[0011] In some implementations, the sensor circuit includes an evaporator temperature detection circuit, an exhaust temperature detection circuit, and an ambient temperature and humidity detection circuit; the evaporator temperature detection circuit includes a sixth terminal block, a fifth electrolytic capacitor, a thirteenth capacitor, a twentieth resistor, and a fifth bidirectional transient suppression diode; the sixth terminal block includes a first terminal and a second terminal, the second terminal being connected to pin PA0 of the main control chip, the second terminal being connected to a 3.3V voltage through the twentieth resistor, the second terminal being grounded through the fifth electrolytic capacitor, the thirteenth capacitor being connected in parallel with the fifth electrolytic capacitor, the first terminal being grounded, and the first terminal being connected to pin PA0 of the main control chip through the fifth bidirectional transient suppression diode; the exhaust temperature detection circuit includes a seventh terminal block, another fifth electrolytic capacitor, a fourteenth capacitor, a twenty-first resistor, and a sixth bidirectional transient suppression diode; the seventh terminal block includes a third terminal and a fourth terminal, the fourth terminal being connected to pin PA1 of the main control chip, the fourth terminal being connected to a 3.3V voltage through the twenty-first resistor, and the fourth terminal being connected to a... Another fifth electrolytic capacitor is grounded, the fourteenth capacitor is connected in parallel with the other fifth electrolytic capacitor, the third terminal is grounded, and the third terminal is connected to pin PA1 of the main control chip through the sixth bidirectional transient suppression diode; the ambient temperature and humidity detection circuit includes an eleventh terminal block, an eighteenth capacitor, a sixth electrolytic capacitor, a twenty-eighth resistor, a twenty-ninth resistor, a seventh bidirectional transient suppression diode, and an eighth bidirectional transient suppression diode; the eleventh terminal block includes a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal, the fifth terminal is grounded, the sixth terminal is grounded through the seventh bidirectional transient suppression diode, the sixth terminal is connected to pin PA5 of the main control chip, the seventh terminal is grounded through the eighth bidirectional transient suppression diode, the seventh terminal is connected to pin PA4 of the main control chip, the twenty-eighth resistor and the twenty-ninth resistor are connected between the sixth and seventh terminals to receive a 3.3V voltage, the eighth terminal receives a 3.3V voltage, the eighth terminal is grounded through the eighteenth capacitor, and the sixth electrolytic capacitor is connected in parallel with the eighteenth capacitor.

[0012] In some possible implementations, the switch signal detection and protection circuit includes a full water detection switch circuit, a low-voltage detection circuit, and a high-voltage detection circuit; the full water detection switch circuit includes an eighth terminal block, a twenty-second resistor, a twenty-third resistor, and a fifteenth capacitor; the eighth terminal block includes a ninth terminal and a tenth terminal, the ninth terminal is grounded, the ninth terminal is connected to pin PA8 of the main control chip through the fifteenth capacitor, the tenth terminal is connected to a 3.3V voltage through the twenty-second resistor, and the tenth terminal is connected to pin PA8 of the main control chip through the twenty-third resistor; the low-voltage detection circuit includes a ninth terminal block, a twenty-fourth resistor, a twenty-fifth resistor, and a sixteenth capacitor; the ninth terminal block includes an eleventh terminal and a twelfth terminal, the... The eleventh terminal is grounded and connected to pin PA9 of the main control chip via the sixteenth capacitor. The twelfth terminal is connected to a 3.3V voltage via the twenty-fourth resistor, and the tenth terminal is connected to pin PA9 of the main control chip via the twenty-fifth resistor. The high-voltage detection circuit includes a tenth terminal block, a twenty-sixth resistor, a twenty-seventh resistor, and a seventeenth capacitor. The tenth terminal block includes a thirteenth terminal and a fourteenth terminal. The thirteenth terminal is grounded and connected to pin PA10 of the main control chip via the seventeenth capacitor. The fourteenth terminal is connected to a 3.3V voltage via the twenty-sixth resistor and connected to pin PA10 of the main control chip via the twenty-seventh resistor.

[0013] In some possible implementations, the external linkage voltage detection circuit includes a thirtieth capacitor, a thirty-second resistor, a thirty-first resistor, a seventh optocoupler, a thirtieth resistor, a seventh polarized capacitor, a bridge rectifier, and a twelfth terminal block. The twelfth terminal block includes a ninth terminal and a tenth terminal, which receive external control signals. The ninth terminal and the tenth terminal are respectively connected to the first pin AC and the second pin AC of the bridge rectifier. The seventh polarized capacitor is connected between the positive and negative pins of the bridge rectifier. The positive pin of the bridge rectifier is connected to the first pin of the seventh optocoupler through the thirtieth resistor, and the negative pin of the bridge rectifier is connected to the second pin of the seventh optocoupler. The third pin of the seventh optocoupler is grounded. The fourth pin of the seventh optocoupler outputs a 3.3V voltage through the thirty-first resistor. The fourth pin of the seventh optocoupler is connected to the pin PB0 of the main control chip through the thirty-second resistor. The fourth pin of the seventh optocoupler is grounded through the thirty-second resistor and the thirtieth capacitor.

[0014] In some possible implementations, the RS485 networking control circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an RS485 conversion chip, a twelfth capacitor, a seventeenth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, an eighth resistor, a first Zener diode, a second Zener diode, and a fourth terminal block; the fourth terminal block includes an eleventh terminal, a twelfth terminal, a thirteenth terminal, and a fourteenth terminal; the eleventh terminal and the twelfth terminal are connected, and connected to the seventh pin of the RS485 conversion chip through the tenth resistor, and grounded through the first Zener diode, and grounded through the tenth resistor and the seventeenth resistor; the thirteenth terminal and the fourteenth terminal are connected, and connected to the sixth pin of the RS485 conversion chip through the eleventh resistor, and grounded through the second Zener diode. The Zener diode is grounded and connected to a 3.3V voltage through the eleventh and twelfth resistors; the eighth resistor is connected between the eleventh and thirteenth terminals; the fifth pin of the RS485 converter chip is grounded, the eighth pin of the RS485 converter chip is connected to a 3.3V voltage, the eighth pin of the RS485 converter chip is grounded through the twelfth capacitor, the first pin of the RS485 converter chip is connected to the main control chip's pin PB11 through the thirteenth resistor, the second pin of the RS485 converter chip is grounded through the fourteenth resistor, the third pin of the RS485 converter chip is connected to the main control chip's pin PB2 through the fifteenth resistor, and the fourth pin of the RS485 converter chip is connected to the main control chip's pin PB10 through the sixteenth resistor.

[0015] In some possible implementations, the EC motor wind speed control circuit includes a twentieth capacitor, a sixth resistor, a sixteenth optocoupler, a twenty-first capacitor, a fourth resistor, a fifth resistor, a fourth polarized capacitor, a fifth terminal block, a twenty-second capacitor, a ninth resistor, a tenth optocoupler, a twenty-third capacitor, another forty-first resistor, a twenty-fourth capacitor, a seventh resistor, another eighth resistor, and a transistor; the fifth terminal block includes a fifteenth terminal, a sixteenth terminal, a seventeenth terminal, and an eighteenth terminal; the fifteenth terminal is connected to AGND, the sixteenth terminal is connected to AGND through the fourth polarized capacitor, the sixteenth terminal is connected to a 10V voltage, the seventeenth terminal is connected to a 10V voltage through the seventh resistor, the seventeenth terminal is connected to the first pin of the tenth optocoupler through the seventh resistor, the seventeenth terminal is connected to AGND through the seventh resistor and the twenty-third capacitor, the seventeenth terminal is connected to the second pin of the tenth optocoupler through the emitter and base of the transistor and the other eighth resistor, and the seventeenth terminal is connected to the emitter of the transistor... The base, collector, and terminal of the tenth optocoupler are connected to the third pin of the tenth optocoupler and then to AGND. The fourth pin of the tenth optocoupler is connected to 3.3V and grounded through the twenty-second capacitor. The fifth pin of the tenth optocoupler is connected to pin PB9 of the main control chip through the ninth resistor. A forty-first resistor is connected between the first and second pins of the tenth optocoupler, and a twenty-fourth capacitor is connected between the second and third pins. The eighteenth terminal is connected to the second pin of the sixteenth optocoupler through the fifth resistor. The first pin of the sixteenth optocoupler is connected to AGND through the twenty-first capacitor and to 10V through the fourth resistor. The third pin of the sixteenth optocoupler is connected to pin PB8 of the main control chip. The third pin of the sixteenth optocoupler is grounded through the sixth resistor. The fourth pin of the sixteenth optocoupler is connected to 3.3V and grounded through the twentyth capacitor.

[0016] Compared to existing technologies, the control circuit for dehumidifier control described in this invention firstly establishes a phase sequence and phase loss detection protection circuit, an interactive control circuit, a damper sweeping control circuit, a sensor circuit, a switch signal detection protection circuit, an external linkage voltage detection circuit, an RS485 network control circuit, and an EC motor fan speed control circuit, all connected to the main control chip. Secondly, a power supply circuit provides power to the entire control circuit. Therefore, the control circuit for dehumidifier control described in this invention can effectively provide circuit design support for multiple functions of the dehumidifier and correspondingly implement the corresponding functions, meeting user needs and improving the working efficiency of the dehumidifier.

[0017] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 A schematic diagram of a control circuit for dehumidifier control provided by this utility model;

[0019] Figure 2 A schematic diagram of the power supply circuit in the control circuit for dehumidifier control provided by this utility model;

[0020] Figure 3 A schematic diagram of the phase sequence and phase loss detection and protection circuit in the control circuit for dehumidifier control provided by this utility model;

[0021] Figure 4 A schematic diagram of the interactive control circuit in the control circuit for dehumidifier control provided by this utility model;

[0022] Figure 5 A schematic diagram of the air valve sweeping control circuit in the control circuit for dehumidifier control provided by this utility model;

[0023] Figure 6 A schematic diagram of the sensor circuit in the control circuit for dehumidifier control provided by this utility model;

[0024] Figure 7 A schematic diagram of a switch signal detection and protection circuit in a control circuit for dehumidifier control provided by this utility model;

[0025] Figure 8 A schematic diagram of the external linkage voltage detection circuit in the control circuit for dehumidifier control provided by this utility model;

[0026] Figure 9 A schematic diagram of the structure of an RS485 network control circuit in a dehumidifier control circuit provided by this utility model;

[0027] Figure 10 A schematic diagram of the EC motor fan speed control circuit in a dehumidifier control circuit provided by this utility model;

[0028] Figure 11 A schematic diagram of the structure of an ambient temperature and humidity detection circuit in a control circuit for dehumidifier control provided by this utility model;

[0029] Figure 12This utility model provides a schematic diagram of the main control chip in a control circuit for dehumidifier control. Detailed Implementation

[0030] This utility model provides a control circuit for dehumidifier control. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0031] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0033] The invention will be further explained below with reference to the accompanying drawings and through description of the embodiments.

[0034] Example 1

[0035] Please refer to Figure 1 and Figure 12 , Figure 1This utility model provides a schematic diagram of a control circuit for controlling a dehumidifier. The control circuit includes: a main control chip, a power supply circuit for providing power to the control circuit, a phase sequence and phase loss detection and protection circuit, an interactive control circuit, a damper swing control circuit, a sensor circuit, a switch signal detection and protection circuit, an external linkage voltage detection circuit, an RS485 network control circuit, and an EC motor fan speed control circuit; wherein the phase sequence and phase loss detection and protection circuit, the interactive control circuit, the damper swing control circuit, the sensor circuit, the switch signal detection and protection circuit, the external linkage voltage detection circuit, the RS485 network control circuit, and the EC motor fan speed control circuit are respectively connected to the main control chip.

[0036] Please refer to this again. Figure 1 and Figure 12 The first VSS pin of the main control chip is grounded, and the first VDD pin of the main control chip is grounded through the ninth capacitor. The first VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The second VSS pin of the main control chip is grounded, and the second VDD pin of the main control chip is grounded through the seventh capacitor. The second VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The third VDD pin of the main control chip is grounded through the nineteenth capacitor. The third VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The VSSA pin of the main control chip is grounded, and the VDDA pin of the main control chip is connected to the power supply circuit. An eighth capacitor is connected between the VSSA pin and the VDDA pin of the main control chip. The BOOT0 pin of the main control chip is grounded through the third resistor.

[0037] In this embodiment, the main control chip can be a 32-bit ARM Core x RISC core processor to improve the working stability of the dehumidifier implementing this utility model and reduce the manufacturing cost of the dehumidifier, or other processors can be used.

[0038] Please refer to Figure 2 The power supply circuit includes a fuse (FUSE1), a varistor (ZNR1), a safety capacitor (X1), a discharge resistor (RS), a common-mode inductor (L1), a thermistor (NTC1), an AC-DC 12V power module, a transient diode (DB1), a first electrolytic capacitor (EC1), a first capacitor (C1), a first DC-DC step-down chip (U2), a second DC-DC step-down chip (U3), a second inductor (L2), a first diode (D1), a second electrolytic capacitor (EC2), a second capacitor (C2), a third inductor (L3), a second diode (D2), a third electrolytic capacitor (EC3), and a third capacitor (C3).

[0039] In this embodiment, one end of the varistor, the safety capacitor, and the discharge resistor is connected to the neutral terminal of the three-phase power system and also to the fourth pin of the common-mode inductor; the other end of the varistor, the safety capacitor, and the discharge resistor is connected to phase C of the three-phase power system via the fuse and also to the first pin of the common-mode inductor; the third pin of the common-mode inductor is connected to pin N of the AC-DC 12V power module, and the second pin of the common-mode inductor is connected to pin L of the AC-DC 12V power module via the thermistor, wherein the third pin of the common-mode inductor is connected to the fourth pin of the common-mode inductor. The fourth pin is the two ends of the same coil in the common-mode inductor; the first and second pins of the common-mode inductor are the two ends of another coil in the common-mode inductor; the negative pin of the AC-DC 12V power module is grounded, the positive pin of the AC-DC 12V power module outputs 12V voltage, and the transient diode is connected between the negative and positive pins of the AC-DC 12V power module; the positive pin of the AC-DC 12V power module is connected to the VIN pin of the first DC-DC step-down chip, and the positive pin of the AC-DC 12V power module is also grounded through the first electrolytic capacitor. The first capacitor is connected in parallel with the first electrolytic capacitor; the GND pin of the first DC-DC step-down chip is grounded, the ON_OFF pin of the first DC-DC step-down chip is grounded, the OUT pin of the first DC-DC step-down chip is grounded through the first diode, the OUT pin of the first DC-DC step-down chip is connected to the VIN pin of the second DC-DC step-down chip through the second inductor and outputs a 5V voltage, the OUT pin of the first DC-DC step-down chip is grounded through the second electrolytic capacitor, the second capacitor is connected in parallel with the second electrolytic capacitor, and the FB pin of the first DC-DC step-down chip... The second DC-DC step-down chip has its pin VIN connected to the second DC-DC step-down chip; its pin GND is grounded; its pin ON_OFF is grounded; its pin OUT is grounded through the second diode; its pin OUT outputs 3.3V through the third inductor; its pin OUT is grounded through the third electrolytic capacitor; the third capacitor is connected in parallel with the third electrolytic capacitor; and its pin FB is connected to the positive terminal of the third electrolytic capacitor.

[0040] In one embodiment, the three-phase power system is a power supply method consisting of three-phase power sources, three-phase loads, and three-phase transmission lines. In this embodiment, the three-phase power system includes phase A, phase B, phase C, and a neutral terminal. The phase difference between each phase is 120 degrees, forming an AC power supply system with a phase-to-phase voltage of 360 degrees.

[0041] In this embodiment, the 220V power supply is input through the C-phase terminal and the neutral wire terminal. The AC 220V is protected by a fuse for short circuit protection, a varistor for lightning protection, a negative temperature coefficient fuse for surge protection, and a conductive interference protection circuit consisting of a safety capacitor and a common mode inductor. A discharge resistor is added next to the safety capacitor to prevent electric shock when the power plug is unplugged, thus making the dehumidifier safer and more reliable in operation.

[0042] In one embodiment, the AC220V to DC+12V conversion is a pluggable power conversion module (i.e., AC-DC12V power module). This voltage conversion module is an independent functional module that is plugged into the circuit board of the control circuit. Using the above design process can improve the accuracy of on-site fault diagnosis and timely maintenance efficiency. If the power module is damaged or abnormal during use, it can be removed and replaced with a new power module, which brings great convenience to circuit maintenance and debugging.

[0043] Please refer to Figure 3 The phase sequence and phase loss detection protection circuit includes the forty-second step-down resistor (R42), the forty-sixth step-down resistor (R46), the fortieth pull-up resistor (R40), the forty-fifth pull-up resistor (R45), the forty-third resistor (R43), the forty-seventh resistor (R47), the eighth optocoupler (U8), the ninth optocoupler (U9), the forty-first resistor (R41), the forty-fourth resistor (R44), the thirty-first capacitor (C31), and the thirty-second capacitor (C32).

[0044] In this embodiment, one end of the forty-second step-down resistor is connected to phase A of the three-phase power system, and the other end of the forty-second step-down resistor is connected to the first pin of the eighth optocoupler; one end of the forty-third resistor is connected to the neutral terminal of the three-phase power system, and the other end of the forty-third resistor is connected to the second pin of the eighth optocoupler; the third pin of the eighth optocoupler is grounded, and the fourth pin of the eighth optocoupler outputs a 3.3V voltage through the forty-first pull-up resistor; the fourth pin of the eighth optocoupler is connected to pin PA7 of the main control chip through the forty-first resistor; and the fourth pin of the eighth optocoupler is connected through the forty-first resistor and the thirty-first capacitor. Grounding; one end of the forty-sixth step-down resistor is connected to phase B of the three-phase power system, and the other end of the forty-sixth step-down resistor is connected to the first pin of the ninth optocoupler; one end of the forty-seventh resistor is connected to the neutral terminal of the three-phase power system, and the other end of the forty-seventh resistor is connected to the second pin of the ninth optocoupler; the third pin of the ninth optocoupler is grounded, the fourth pin of the ninth optocoupler outputs a 3.3V voltage through the forty-fifth pull-up resistor, the fourth pin of the ninth optocoupler is connected to pin PA6 of the main control chip through the forty-fourth resistor, and the fourth pin of the ninth optocoupler is grounded through the forty-fourth resistor and the thirty-second capacitor.

[0045] In this embodiment, the input phase voltage is linearly stepped down by the step-down resistors R42 / R46 and then passes through the LED at the input of the optocoupler U8 / U9. The phase voltage is an AC power supply of 50Hz. After being stepped down by the resistors, it is still an AC voltage. Utilizing the unidirectional conductivity of the diode, the photodiode conducts and emits light only when the input voltage is greater than the diode's conduction threshold. The photodiode follows the saturation conduction and cutoff to form a switching action. Therefore, a 50Hz pulse width wave signal can be obtained after pulling up the resistors R40 / R45 at pin 4 of the optocoupler U8 / U9. The microcontroller pin detects the waveform signal of this pin for timing. Using the principle that the phase voltage sequence of the three-phase power supply differs by 120°, it determines whether the phase voltage sequence is correct and whether there is a phase loss. If there is a phase loss or the phase sequence is reversed, the controller stops outputting the compressor and fan drive signals to protect the operation of the three-phase compressor and three-phase fan. When no voltage is detected in either of the above two phases, the controller does not need to perform input power supply phase sequence protection and phase loss protection for the compressor and fan.

[0046] Please refer to Figure 4 The interactive control circuit includes a compressor control circuit, a fan speed control circuit, an external linkage control circuit, and a control signal conversion circuit.

[0047] In this embodiment, the control signal conversion circuit includes a conversion chip (U4) and a tenth capacitor (C10). The E pin of the conversion chip is grounded, the COM pin of the conversion chip is connected to a 12V voltage, the COM pin of the conversion chip is grounded through the tenth capacitor, the C1 pin of the conversion chip is connected to the PB7 pin of the main control chip, the C3 pin of the conversion chip is connected to the PB5 pin of the main control chip, the C4 pin of the conversion chip is connected to the PB4 pin of the main control chip, and the C5 pin of the conversion chip is connected to the PB3 pin of the main control chip.

[0048] In this embodiment, the compressor control circuit includes a compressor and a first relay (KY1); the compressor's pin CP1 is connected to the first pin of the first relay, the second pin of the first relay is connected to phase C of the three-phase power system, the third pin of the first relay outputs 12V voltage, and the fourth pin of the first relay is connected to pin B1 of the conversion chip. The first and second pins of the first relay are connected in the first relay through a trigger switch, and the third and fourth pins of the first relay are connected in the first relay.

[0049] In this embodiment, the fan speed control circuit includes a third relay (KY3) and a fourth relay (KY4). The first pin of the third relay is connected to the high-speed interface of the fan, the second pin of the third relay is connected to the C phase of the three-phase power system, and the third pin of the third relay outputs a 12V voltage. The fourth pin of the third relay is connected to pin B4 of the conversion chip. The first pin of the fourth relay is connected to the low-speed interface of the fan, the second pin of the fourth relay is connected to the C phase of the three-phase power system, and the third pin of the fourth relay outputs a 12V voltage. The fourth pin of the fourth relay is connected to pin B3 of the conversion chip. The first and second pins of the third relay are connected in the third relay via a trigger switch, and the third and fourth pins of the third relay are connected in the third relay. The first and second pins of the fourth relay are connected in the fourth relay via a trigger switch, and the third and fourth pins of the fourth relay are connected in the fourth relay.

[0050] In this embodiment, the compressor is started and stopped by relay KY1, and the fan is operated by relays KY3 and KY4 to control its high or low speed setting.

[0051] In this embodiment, the external linkage control circuit includes a passive dry contact terminal block (CN3) and a fifth relay (KY5). The passive dry contact terminal block includes at least a first terminal, a second terminal, and a third terminal. The normally open terminal of the fifth relay is connected to the first terminal, the common terminal of the fifth relay is connected to the second terminal, and the normally closed terminal of the fifth relay is connected to the third terminal. The first pin of the fifth relay outputs a 12V voltage, and the second pin of the fifth relay is connected to pin B5 of the conversion chip. The first and second pins of the fifth relay are connected in the fifth relay.

[0052] In this embodiment, when the dehumidifier system is turned on, the external door or air valve is closed; when the dehumidifier system stops running, the external door or air valve is opened. The circuit here uses a passive dry contact control output, which expands the types of externally linked devices. The dry contact output is equivalent to a mechanical switch with normally open and normally closed functions, and can be connected to any external linked device controlled by a high voltage or a low voltage.

[0053] Please refer to Figure 5 The air valve sweeping control circuit includes a thirteenth terminal block (CN13), an eleventh capacitor (C11), and an air valve control signal conversion chip (U5).

[0054] In this embodiment, the thirteenth terminal block includes a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal. The fourth terminal is connected to pin C2 of the damper control signal conversion chip, the fifth terminal is connected to pin C3 of the damper control signal conversion chip, the sixth terminal is connected to pin C4 of the damper control signal conversion chip, the seventh terminal is connected to pin C5 of the damper control signal conversion chip, and the eighth terminal is connected to pin COM of the damper control signal conversion chip. The eighth terminal is connected to a 12V voltage and is grounded through the eleventh capacitor. Pin B2 of the damper control signal conversion chip is connected to pin PB15 of the main control chip, pin B3 of the damper control signal conversion chip is connected to pin PB14 of the main control chip, pin B4 of the damper control signal conversion chip is connected to pin PB13 of the main control chip, pin B5 of the damper control signal conversion chip is connected to pin PB12 of the main control chip, and pin E of the damper control signal conversion chip is grounded.

[0055] Please refer to Figure 6 and Figure 11The sensor circuit includes an evaporator temperature detection circuit, an exhaust temperature detection circuit, and an ambient temperature and humidity detection circuit. The evaporator temperature detection circuit, the exhaust temperature detection circuit, and the ambient temperature and humidity detection circuit are all equipped with electrostatic protection to prevent static electricity from human hands or their interference voltage from entering the port and damaging the controller when the sensor is connected.

[0056] In this embodiment, the evaporator temperature detection circuit includes a sixth terminal block (CN6), a fifth electrolytic capacitor (EC5), a thirteenth capacitor (C13), a twentieth resistor (R20), and a fifth bidirectional transient suppressor diode (RLSD5). The sixth terminal block includes a first terminal and a second terminal. The second terminal is connected to pin PA0 of the main control chip. The second terminal is connected to a 3.3V voltage through the twentieth resistor. The second terminal is grounded through the fifth electrolytic capacitor. The thirteenth capacitor is connected in parallel with the fifth electrolytic capacitor. The first terminal is grounded and connected to pin PA0 of the main control chip through the fifth bidirectional transient suppressor diode.

[0057] In one embodiment, the sixth terminal block is connected to a sensor for detecting the temperature of the evaporator.

[0058] In this embodiment, the exhaust temperature detection circuit includes a seventh terminal block (CN7), another fifth electrolytic capacitor (EC5), a fourteenth capacitor (C14), a twenty-first resistor (R21), and a sixth bidirectional transient suppressor diode (RLSD6). The seventh terminal block includes a third terminal and a fourth terminal. The fourth terminal is connected to pin PA1 of the main control chip. The fourth terminal is connected to a 3.3V voltage through the twenty-first resistor. The fourth terminal is grounded through the other fifth electrolytic capacitor. The fourteenth capacitor is connected in parallel with the other fifth electrolytic capacitor. The third terminal is grounded. The third terminal is connected to pin PA1 of the main control chip through the sixth bidirectional transient suppressor diode.

[0059] In one embodiment, an electronic component including the prefix "another" can be completely identical to the original electronic component in terms of properties and physical characteristics. In other alternative embodiments, those skilled in the art can also make adaptive substitutions between the two according to the actual situation and common knowledge in the art to adapt to the corresponding circuit.

[0060] In one embodiment, the seventh terminal block is connected to a sensor for detecting exhaust temperature.

[0061] In this embodiment, the ambient temperature and humidity detection circuit includes an eleventh terminal block (CN11), an eighteenth capacitor (C18), a sixth electrolytic capacitor (EC6), a twenty-eighth resistor (R28), a twenty-ninth resistor (R29), a seventh bidirectional transient voltage suppressor diode (RLSD7), and an eighth bidirectional transient voltage suppressor diode (RLSD8). The eleventh terminal block includes a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal. The fifth terminal is grounded, the sixth terminal is grounded through the seventh bidirectional transient voltage suppressor diode, and the sixth terminal is connected to pin PA5 of the main control chip. The seventh terminal is grounded through the eighth bidirectional transient voltage suppressor diode and is connected to pin PA4 of the main control chip. The twenty-eighth resistor and the twenty-ninth resistor are connected between the sixth and seventh terminals to provide a 3.3V voltage. The eighth terminal is connected to a 3.3V voltage and is grounded through the eighteenth capacitor. The sixth electrolytic capacitor is connected in parallel with the eighteenth capacitor.

[0062] In one embodiment, the eleventh terminal block is connected to a sensor for detecting ambient temperature and humidity.

[0063] Please refer to Figure 7 The switch signal detection and protection circuit includes a full water detection switch circuit, a low voltage detection circuit, and a high voltage detection circuit.

[0064] In one embodiment, the full water detection switch circuit includes an eighth terminal block (CN8), a twenty-second resistor (R22), a twenty-third resistor (R23), and a fifteenth capacitor (C15); the eighth terminal block includes a ninth terminal and a tenth terminal, the ninth terminal is grounded, the ninth terminal is connected to pin PA8 of the main control chip through the fifteenth capacitor, the tenth terminal is connected to a 3.3V voltage through the twenty-second resistor, and the tenth terminal is connected to pin PA8 of the main control chip through the twenty-third resistor.

[0065] In this embodiment, when the dehumidifier's water tank is full, the dehumidifier stops dehumidifying and sends a signal to prompt the user to empty the water tank.

[0066] In one embodiment, the eighth terminal block is connected to a sensor for detecting water level.

[0067] In one embodiment, the low-voltage detection circuit includes a ninth terminal block (CN9), a twenty-fourth resistor (R24), a twenty-fifth resistor (R25), and a sixteenth capacitor (C16); the ninth terminal block includes an eleventh terminal and a twelfth terminal, the eleventh terminal is grounded, the eleventh terminal is connected to pin PA9 of the main control chip through the sixteenth capacitor, the twelfth terminal is connected to a 3.3V voltage through the twenty-fourth resistor, and the tenth terminal is connected to pin PA9 of the main control chip through the twenty-fifth resistor.

[0068] In one embodiment, the ninth terminal block is connected to a sensor for detecting low pressure.

[0069] In one embodiment, the high-voltage detection circuit includes a tenth terminal block (CN10), a twenty-sixth resistor (R26), a twenty-seventh resistor (R27), and a seventeenth capacitor (C17); the tenth terminal block includes a thirteenth terminal and a fourteenth terminal, the thirteenth terminal is grounded, the thirteenth terminal is connected to pin PA10 of the main control chip through the seventeenth capacitor, the fourteenth terminal is connected to a 3.3V voltage through the twenty-sixth resistor, and the fourteenth terminal is connected to pin PA10 of the main control chip through the twenty-seventh resistor.

[0070] In this embodiment, when the dehumidifier system is equipped with a low-pressure detection circuit / low-pressure detection circuit, it is only necessary to short-circuit the two detection ports.

[0071] In one embodiment, the tenth terminal block is connected to a sensor for detecting high voltage.

[0072] Please refer to Figure 8 The external linkage voltage detection circuit includes a thirtieth capacitor (C30), a thirty-second resistor (R32), a thirty-first resistor (R31), a seventh optocoupler (U), a thirtieth resistor (R30), a seventh polarized capacitor (EC7), a bridge rectifier (DB2), and a twelfth terminal block (CN12).

[0073] In one embodiment, the twelfth terminal block includes a ninth terminal and a tenth terminal, the ninth terminal and the tenth terminal receiving external control signals, and the ninth terminal and the tenth terminal being connected to the first pin AC and the second pin AC of the bridge rectifier, respectively.

[0074] In one embodiment, a seventh polarity capacitor is connected between the positive and negative pins of the bridge rectifier. The positive pin of the bridge rectifier is connected to the first pin of the seventh optocoupler through the thirtieth resistor, and the negative pin of the bridge rectifier is connected to the second pin of the seventh optocoupler. The third pin of the seventh optocoupler is grounded. The fourth pin of the seventh optocoupler outputs a 3.3V voltage through the thirty-first resistor. The fourth pin of the seventh optocoupler is connected to pin PB0 of the main control chip through the thirty-second resistor. The fourth pin of the seventh optocoupler is grounded through the thirty-second resistor and the thirtieth capacitor.

[0075] In this embodiment, the external signal is input through the CN12 terminal. After being rectified by a bridge rectifier (DB2), the input signal enters the optocoupler isolation detection circuit. The microcontroller can detect the change of the fourth pin of the optocoupler (U7) to realize the linkage on / off function of the dehumidifier system. Moreover, this external linkage input is suitable for AC and DC voltage signals and does not distinguish the signal polarity, which can bring great convenience to the installation, wiring and application scope of the linkage control of the model.

[0076] Please refer to Figure 9 The RS485 networking control circuit includes a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), a sixteenth resistor (R16), an RS485 conversion chip (U6), a twelfth capacitor (C12), a seventeenth resistor (R17), a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), an eighth resistor (R8), a first Zener diode (RLSD1), a second Zener diode (RLSD2), and a fourth terminal block (CN4).

[0077] In one embodiment, RS485 refers to a serial communication standard widely used in industrial automation and control systems; in this embodiment, commonly used RS485 conversion chips include TI's SN75176 and MAXIM's MAX485.

[0078] In one embodiment, the fourth terminal block includes an eleventh terminal, a twelfth terminal, a thirteenth terminal, and a fourteenth terminal; the eleventh terminal and the twelfth terminal are connected, and connected to the seventh pin of the RS485 conversion chip through the tenth resistor, and grounded through the first Zener diode, and grounded through the tenth resistor and the seventeenth resistor; the thirteenth terminal and the fourteenth terminal are connected, and connected to the sixth pin of the RS485 conversion chip through the eleventh resistor, and grounded through the second Zener diode, and connected to a 3.3V voltage through the eleventh resistor and the twelfth resistor; the eleventh terminal and the thirteenth terminal are connected... The circuit includes an eighth resistor; the fifth pin of the RS485 converter chip is grounded; the eighth pin of the RS485 converter chip is connected to a 3.3V voltage; the eighth pin of the RS485 converter chip is grounded through the twelfth capacitor; the first pin of the RS485 converter chip is connected to pin PB11 of the main control chip through the thirteenth resistor; the second pin of the RS485 converter chip is grounded through the fourteenth resistor; the third pin of the RS485 converter chip is connected to pin PB2 of the main control chip through the fifteenth resistor; and the fourth pin of the RS485 converter chip is connected to pin PB10 of the main control chip through the sixteenth resistor.

[0079] In this embodiment, to prevent electrostatic discharge and surge voltage from damaging the I / O port, a surge discharge tube is added to the communication I / O port to protect it from lightning surge damage.

[0080] Please refer to Figure 10 The EC motor wind speed control circuit includes a twentieth capacitor (C20), a sixth resistor (R6), a sixteenth optocoupler (U16), a twenty-first capacitor (C21), a fourth resistor (R4), a fifth resistor (R5), a fourth polarized capacitor (EC4), a fifth terminal block (CN5), a twenty-second capacitor (C22), a ninth resistor (R9), a tenth optocoupler (U7), a twenty-third capacitor (C23), another forty-first resistor (R41), a twenty-fourth capacitor (C24), a seventh resistor (R7), another eighth resistor (R8), and a transistor (Q6).

[0081] In one embodiment, the fifth terminal block includes a fifteenth terminal, a sixteenth terminal, a seventeenth terminal, and an eighteenth terminal; the fifteenth terminal is connected to AGND, the sixteenth terminal is connected to AGND through the fourth polarity capacitor, and the sixteenth terminal is connected to a 10V voltage.

[0082] In this embodiment, the seventeenth terminal is connected to a 10V voltage through the seventh resistor, the seventeenth terminal is connected to the first pin of the tenth optocoupler through the seventh resistor, the seventeenth terminal is connected to AGND through the seventh resistor and the twenty-third capacitor, the seventeenth terminal is connected to the second pin of the tenth optocoupler through the emitter and base of the transistor and the other eighth resistor, the seventeenth terminal is connected to the third pin of the tenth optocoupler and connected to AGND through the emitter, base and collector of the transistor; the fourth pin of the tenth optocoupler is connected to a 3.3V voltage, the fourth pin of the tenth optocoupler is grounded through the twenty-second capacitor, the fifth pin of the tenth optocoupler is connected to pin PB9 of the main control chip through the ninth resistor, wherein the other forty-first resistor is connected between the first pin and the second pin of the tenth optocoupler, and the twenty-fourth capacitor is connected between the second pin and the third pin of the tenth optocoupler.

[0083] Here, AGND refers to the zero-potential common reference ground of the analog circuit.

[0084] In this embodiment, the eighteenth terminal is connected to the second pin of the sixteenth optocoupler through the fifth resistor; the first pin of the sixteenth optocoupler is connected to AGND through the twenty-first capacitor, and the first pin of the sixteenth optocoupler is connected to a 10V voltage through the fourth resistor; the third pin of the sixteenth optocoupler is connected to pin PB8 of the main control chip; the third pin of the sixteenth optocoupler is grounded through the sixth resistor; the fourth pin of the sixteenth optocoupler is connected to a 3.3V voltage, and the fourth pin of the sixteenth optocoupler is grounded through the twentieth capacitor.

[0085] In this embodiment, the EC motor refers to a DC motor. In other alternative implementations, an AC motor can also be connected by setting up an additional circuit.

[0086] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A control circuit for controlling a dehumidifier, characterized in that, include: The system includes a main control chip, a power supply circuit for providing power to the control circuit, a phase sequence and phase loss detection and protection circuit, an interactive control circuit, a wind valve sweeping control circuit, a sensor circuit, a switch signal detection and protection circuit, an external linkage voltage detection circuit, an RS485 network control circuit, and an EC motor wind speed control circuit. The phase sequence and phase loss detection protection circuit, interactive control circuit, air valve sweeping control circuit, sensor circuit, switch signal detection protection circuit, external linkage voltage detection circuit, RS485 network control circuit and EC motor wind speed control circuit are respectively connected to the main control chip. The first VSS pin of the main control chip is grounded, the first VDD pin of the main control chip is grounded through the ninth capacitor, and the first VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The second VSS pin of the main control chip is grounded, the second VDD pin of the main control chip is grounded through the seventh capacitor, and the second VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The third VDD pin of the main control chip is grounded through the nineteenth capacitor, and the third VDD pin of the main control chip is also connected to the power supply circuit to obtain a 3.3V power supply. The VSSA pin of the main control chip is grounded, the VDDA pin of the main control chip is connected to the power supply circuit, an eighth capacitor is connected between the VSSA pin and the VDDA pin of the main control chip, and the BOOT0 pin of the main control chip is grounded through a third resistor.

2. The control circuit for dehumidifier control according to claim 1, characterized in that: The power supply circuit includes a fuse, a varistor, a safety capacitor, a discharge resistor, a common-mode inductor, a thermistor, an AC-DC 12V power module, a transient diode, a first electrolytic capacitor, a first capacitor, a first DC-DC step-down chip, a second DC-DC step-down chip, a second inductor, a first diode, a second electrolytic capacitor, a second capacitor, a third inductor, a second diode, a third electrolytic capacitor, and a third capacitor; One end of the varistor, the safety capacitor, and the discharge resistor is connected to the neutral terminal of the three-phase power system and is also connected to the fourth pin of the common-mode inductor; the other end of the varistor, the safety capacitor, and the discharge resistor is connected to phase C of the three-phase power system through the fuse and is also connected to the first pin of the common-mode inductor. The third pin of the common-mode inductor is connected to pin N of the AC-DC 12V power module, and the second pin of the common-mode inductor is connected to pin L of the AC-DC 12V power module through the thermistor. The third pin and the fourth pin of the common-mode inductor are the two ends of the same coil in the common-mode inductor, and the first pin and the second pin of the common-mode inductor are the two ends of another coil in the common-mode inductor. The negative pin of the AC-DC 12V power module is grounded, and the positive pin of the AC-DC 12V power module outputs a 12V voltage. The transient diode is connected between the negative and positive pins of the AC-DC 12V power module. The positive pin of the AC-DC 12V power module is connected to the VIN pin of the first DC-DC step-down chip. The positive pin of the AC-DC 12V power module is also grounded through the first electrolytic capacitor, and the first capacitor is connected in parallel with the first electrolytic capacitor. The first DC-DC step-down chip has its GND pin grounded, its ON_OFF pin grounded, its OUT pin grounded through the first diode, its OUT pin connected to the VIN pin of the second DC-DC step-down chip through the second inductor and outputting a 5V voltage, its OUT pin grounded through the second electrolytic capacitor, its second capacitor connected in parallel with the second electrolytic capacitor, and its FB pin connected to the VIN pin of the second DC-DC step-down chip. The GND pin of the second DC-DC step-down chip is grounded, the ON_OFF pin of the second DC-DC step-down chip is grounded, the OUT pin of the second DC-DC step-down chip is grounded through the second diode, the OUT pin of the second DC-DC step-down chip outputs a 3.3V voltage through the third inductor, the OUT pin of the second DC-DC step-down chip is grounded through the third electrolytic capacitor, the third capacitor is connected in parallel with the third electrolytic capacitor, and the FB pin of the second DC-DC step-down chip is connected to the positive terminal of the third electrolytic capacitor.

3. The control circuit for dehumidifier control according to claim 1, characterized in that: The phase sequence and phase loss detection and protection circuit includes a 42nd step-down resistor, a 46th step-down resistor, a 40th pull-up resistor, a 45th pull-up resistor, a 43rd resistor, a 47th resistor, an 8th optocoupler, a 9th optocoupler, a 41st resistor, a 44th resistor, a 31st capacitor, and a 32nd capacitor. One end of the forty-second step-down resistor is connected to phase A of the three-phase power system, and the other end of the forty-second step-down resistor is connected to the first pin of the eighth optocoupler; one end of the forty-third resistor is connected to the neutral terminal of the three-phase power system, and the other end of the forty-third resistor is connected to the second pin of the eighth optocoupler; the third pin of the eighth optocoupler is grounded; the fourth pin of the eighth optocoupler outputs a 3.3V voltage through the forty-first pull-up resistor; the fourth pin of the eighth optocoupler is connected to pin PA7 of the main control chip through the forty-first resistor; and the fourth pin of the eighth optocoupler is grounded through the forty-first resistor and the thirty-first capacitor. One end of the forty-sixth step-down resistor is connected to phase B of the three-phase power system, and the other end of the forty-sixth step-down resistor is connected to the first pin of the ninth optocoupler; one end of the forty-seventh resistor is connected to the neutral terminal of the three-phase power system, and the other end of the forty-seventh resistor is connected to the second pin of the ninth optocoupler; the third pin of the ninth optocoupler is grounded, the fourth pin of the ninth optocoupler outputs a 3.3V voltage through the forty-fifth pull-up resistor, the fourth pin of the ninth optocoupler is connected to pin PA6 of the main control chip through the forty-fourth resistor, and the fourth pin of the ninth optocoupler is grounded through the forty-fourth resistor and the thirty-second capacitor.

4. The control circuit for dehumidifier control according to claim 1, characterized in that: The interactive control circuit includes a compressor control circuit, a fan speed control circuit, an external linkage control circuit, and a control signal conversion circuit. The control signal conversion circuit includes a conversion chip and a tenth capacitor. The E pin of the conversion chip is grounded, the COM pin of the conversion chip is connected to a 12V voltage, the COM pin of the conversion chip is grounded through the tenth capacitor, the C1 pin of the conversion chip is connected to the PB7 pin of the main control chip, the C3 pin of the conversion chip is connected to the PB5 pin of the main control chip, the C4 pin of the conversion chip is connected to the PB4 pin of the main control chip, and the C5 pin of the conversion chip is connected to the PB3 pin of the main control chip. The compressor control circuit includes a compressor and a first relay; the compressor's pin CP1 is connected to the first pin of the first relay, the second pin of the first relay is connected to phase C of the three-phase power system, the third pin of the first relay outputs 12V voltage, and the fourth pin of the first relay is connected to the pin B1 of the conversion chip. The first and second pins of the first relay are connected in the first relay through a trigger switch, and the third and fourth pins of the first relay are connected in the first relay. The fan speed control circuit includes a third relay and a fourth relay. The first pin of the third relay is connected to the high-speed interface of the fan, the second pin of the third relay is connected to phase C of the three-phase power system, and the third pin of the third relay outputs 12V. The fourth pin of the third relay is connected to pin B4 of the conversion chip. The first pin of the fourth relay is connected to the low-speed interface of the fan, the second pin of the fourth relay is connected to phase C of the three-phase power system, and the third pin of the fourth relay outputs 12V. The fourth pin of the fourth relay is connected to pin B3 of the conversion chip. The first and second pins of the third relay are connected within the third relay via a trigger switch, and the third and fourth pins of the third relay are also connected within the third relay. Similarly, the first and second pins of the fourth relay are connected within the fourth relay via a trigger switch, and the third and fourth pins of the fourth relay are also connected within the fourth relay. The external linkage control circuit includes a passive dry contact terminal block and a fifth relay. The passive dry contact terminal block includes at least a first terminal block, a second terminal block, and a third terminal block. The normally open terminal of the fifth relay is connected to the first terminal block, the common terminal of the fifth relay is connected to the second terminal block, and the normally closed terminal of the fifth relay is connected to the third terminal block. The first pin of the fifth relay outputs a 12V voltage, and the second pin of the fifth relay is connected to pin B5 of the conversion chip. The first and second pins of the fifth relay are connected in the fifth relay.

5. The control circuit for dehumidifier control according to claim 1, characterized in that: The air valve sweeping control circuit includes a thirteenth terminal block, an eleventh capacitor, and an air valve control signal conversion chip. The thirteenth terminal block includes a fourth terminal block, a fifth terminal block, a sixth terminal block, a seventh terminal block, and an eighth terminal block. The fourth terminal block is connected to pin C2 of the air valve control signal conversion chip, the fifth terminal block is connected to pin C3 of the air valve control signal conversion chip, the sixth terminal block is connected to pin C4 of the air valve control signal conversion chip, the seventh terminal block is connected to pin C5 of the air valve control signal conversion chip, and the eighth terminal block is connected to pin COM of the air valve control signal conversion chip. The eighth terminal block is connected to a 12V voltage and is grounded through the eleventh capacitor. Pin B2 of the air valve control signal conversion chip is connected to pin PB15 of the main control chip, pin B3 of the air valve control signal conversion chip is connected to pin PB14 of the main control chip, pin B4 of the air valve control signal conversion chip is connected to pin PB13 of the main control chip, pin B5 of the air valve control signal conversion chip is connected to pin PB12 of the main control chip, and pin E of the air valve control signal conversion chip is grounded.

6. The control circuit for dehumidifier control according to claim 1, characterized in that: The sensor circuit includes an evaporator temperature detection circuit, an exhaust temperature detection circuit, and an ambient temperature and humidity detection circuit. The evaporator temperature detection circuit includes a sixth terminal block, a fifth electrolytic capacitor, a thirteenth capacitor, a twentieth resistor, and a fifth bidirectional transient suppression diode. The sixth terminal block includes a first terminal and a second terminal. The second terminal is connected to pin PA0 of the main control chip. The second terminal is connected to a 3.3V voltage through the twentieth resistor. The second terminal is grounded through the fifth electrolytic capacitor. The thirteenth capacitor is connected in parallel with the fifth electrolytic capacitor. The first terminal is grounded and connected to pin PA0 of the main control chip through the fifth bidirectional transient suppression diode. The exhaust temperature detection circuit includes a seventh terminal block, another fifth electrolytic capacitor, a fourteenth capacitor, a twenty-first resistor, and a sixth bidirectional transient suppression diode. The seventh terminal block includes a third terminal and a fourth terminal. The fourth terminal is connected to pin PA1 of the main control chip. The fourth terminal is connected to a 3.3V voltage through the twenty-first resistor. The fourth terminal is grounded through the other fifth electrolytic capacitor. The fourteenth capacitor is connected in parallel with the other fifth electrolytic capacitor. The third terminal is grounded. The third terminal is connected to pin PA1 of the main control chip through the sixth bidirectional transient suppression diode. The ambient temperature and humidity detection circuit includes an eleventh terminal block, an eighteenth capacitor, a sixth electrolytic capacitor, a twenty-eighth resistor, a twenty-ninth resistor, a seventh bidirectional transient voltage suppressor diode, and an eighth bidirectional transient voltage suppressor diode. The eleventh terminal block includes a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal. The fifth terminal is grounded, the sixth terminal is grounded through the seventh bidirectional transient voltage suppressor diode, and the sixth terminal is connected to pin PA5 of the main control chip. The seventh terminal is grounded through the eighth bidirectional transient voltage suppressor diode and is connected to pin PA4 of the main control chip. The twenty-eighth and twenty-ninth resistors are connected between the sixth and seventh terminals to provide a 3.3V voltage. The eighth terminal is connected to a 3.3V voltage and is grounded through the eighteenth capacitor. The sixth electrolytic capacitor is connected in parallel with the eighteenth capacitor.

7. The control circuit for dehumidifier control according to claim 1, characterized in that: The switch signal detection and protection circuit includes a full water detection switch circuit, a low voltage detection circuit, and a high voltage detection circuit. The full water detection switch circuit includes an eighth terminal block, a twenty-second resistor, a twenty-third resistor, and a fifteenth capacitor; the eighth terminal block includes a ninth terminal and a tenth terminal, the ninth terminal is grounded, the ninth terminal is connected to pin PA8 of the main control chip through the fifteenth capacitor, the tenth terminal is connected to a 3.3V voltage through the twenty-second resistor, and the tenth terminal is connected to pin PA8 of the main control chip through the twenty-third resistor; The low-voltage detection circuit includes a ninth terminal block, a twenty-fourth resistor, a twenty-fifth resistor, and a sixteenth capacitor; the ninth terminal block includes an eleventh terminal and a twelfth terminal, the eleventh terminal is grounded, the eleventh terminal is connected to pin PA9 of the main control chip through the sixteenth capacitor, the twelfth terminal is connected to a 3.3V voltage through the twenty-fourth resistor, and the tenth terminal is connected to pin PA9 of the main control chip through the twenty-fifth resistor; The high-voltage detection circuit includes a tenth terminal block, a twenty-sixth resistor, a twenty-seventh resistor, and a seventeenth capacitor; the tenth terminal block includes a thirteenth terminal and a fourteenth terminal, the thirteenth terminal is grounded, the thirteenth terminal is connected to pin PA10 of the main control chip through the seventeenth capacitor, the fourteenth terminal is connected to a 3.3V voltage through the twenty-sixth resistor, and the fourteenth terminal is connected to pin PA10 of the main control chip through the twenty-seventh resistor.

8. The control circuit for dehumidifier control according to claim 1, characterized in that: The external linkage voltage detection circuit includes a thirtieth capacitor, a thirty-second resistor, a thirty-first resistor, a seventh optocoupler, a thirtieth resistor, a seventh polarized capacitor, a bridge rectifier, and a twelfth terminal block. The twelfth terminal block includes a ninth terminal and a tenth terminal. The ninth terminal and the tenth terminal receive external control signals. The ninth terminal and the tenth terminal are respectively connected to the first pin AC and the second pin AC of the bridge rectifier. The seventh polarity capacitor is connected between the positive and negative pins of the bridge rectifier. The positive pin of the bridge rectifier is connected to the first pin of the seventh optocoupler through the thirtieth resistor. The negative pin of the bridge rectifier is connected to the second pin of the seventh optocoupler. The third pin of the seventh optocoupler is grounded, the fourth pin of the seventh optocoupler outputs a 3.3V voltage through the thirty-first resistor, the fourth pin of the seventh optocoupler is connected to the pin PB0 of the main control chip through the thirty-second resistor, and the fourth pin of the seventh optocoupler is grounded through the thirty-second resistor and the thirtieth capacitor.

9. The control circuit for dehumidifier control according to claim 1, characterized in that: The RS485 network control circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an RS485 conversion chip, a twelfth capacitor, a seventeenth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, an eighth resistor, a first Zener diode, a second Zener diode, and a fourth terminal block. The fourth terminal block includes an eleventh terminal, a twelfth terminal, a thirteenth terminal, and a fourteenth terminal; the eleventh and twelfth terminals are connected and connected to the seventh pin of the RS485 converter chip through the tenth resistor, and grounded through the first Zener diode, and grounded through the tenth and seventeenth resistors; the thirteenth and fourteenth terminals are connected and connected to the sixth pin of the RS485 converter chip through the eleventh resistor, and grounded through the second Zener diode, and connected to a 3.3V voltage through the eleventh and twelfth resistors; the eighth resistor is connected between the eleventh and thirteenth terminals; The fifth pin of the RS485 converter chip is grounded, the eighth pin of the RS485 converter chip is connected to a 3.3V voltage, the eighth pin of the RS485 converter chip is grounded through the twelfth capacitor, the first pin of the RS485 converter chip is connected to the main control chip's pin PB11 through the thirteenth resistor, the second pin of the RS485 converter chip is grounded through the fourteenth resistor, the third pin of the RS485 converter chip is connected to the main control chip's pin PB2 through the fifteenth resistor, and the fourth pin of the RS485 converter chip is connected to the main control chip's pin PB10 through the sixteenth resistor.

10. The control circuit for dehumidifier control according to claim 1, characterized in that: The EC motor wind speed control circuit includes a twentieth capacitor, a sixth resistor, a sixteenth optocoupler, a twenty-first capacitor, a fourth resistor, a fifth resistor, a fourth polarized capacitor, a fifth terminal block, a twenty-second capacitor, a ninth resistor, a tenth optocoupler, a twenty-third capacitor, another forty-first resistor, a twenty-fourth capacitor, a seventh resistor, another eighth resistor, and a transistor. The fifth terminal block includes a fifteenth terminal, a sixteenth terminal, a seventeenth terminal, and an eighteenth terminal; the fifteenth terminal is connected to AGND, the sixteenth terminal is connected to AGND through the fourth polarity capacitor, and the sixteenth terminal is connected to a 10V voltage. The seventeenth terminal is connected to a 10V voltage through the seventh resistor. The seventeenth terminal is also connected to the first pin of the tenth optocoupler through the seventh resistor. The seventeenth terminal is connected to AGND through the seventh resistor and the twenty-third capacitor. The seventeenth terminal is connected to the second pin of the tenth optocoupler through the emitter and base of the transistor and the other eighth resistor. The seventeenth terminal is connected to the third pin of the tenth optocoupler and then to AGND through the emitter, base, and collector of the transistor. The fourth pin of the tenth optocoupler is connected to a 3.3V voltage. The fourth pin of the tenth optocoupler is grounded through the twenty-second capacitor. The fifth pin of the tenth optocoupler is connected to pin PB9 of the main control chip through the ninth resistor. The forty-first resistor is connected between the first and second pins of the tenth optocoupler, and the twenty-fourth capacitor is connected between the second and third pins of the tenth optocoupler. The eighteenth terminal is connected to the second pin of the sixteenth optocoupler through the fifth resistor; The first pin of the sixteenth optocoupler is connected to AGND through the twenty-first capacitor, and the first pin of the sixteenth optocoupler is connected to a 10V voltage through the fourth resistor; the third pin of the sixteenth optocoupler is connected to pin PB8 of the main control chip; the third pin of the sixteenth optocoupler is grounded through the sixth resistor; the fourth pin of the sixteenth optocoupler is connected to a 3.3V voltage, and the fourth pin of the sixteenth optocoupler is grounded through the twentyth capacitor.

Images