A circuit for an air-to-water machine

Abstract

The utility model discloses a kind of circuit of air water generator, belong to intelligent household electrical appliances technical field;The G pole of N channel field effect tube MQ3 is electrically connected with the control output end M3 of main control chip U4, the S pole of N channel field effect tube MQ3 is grounded, the D pole of N channel field effect tube MQ3 is electrically connected with the negative pole of germicidal lamp, the positive pole of germicidal lamp is electrically connected with the 24V output end of power module;The G pole of N channel field effect tube MQ2 is electrically connected with the control output end MQ2 of main control chip U4, the S pole of N channel field effect tube MQ2 is grounded, the D pole of N channel field effect tube MQ2 is electrically connected with the negative pole of water pump, the positive pole of water pump is electrically connected with the 24V output end of power module.The circuit of air water generator solves the problem that water pump and germicidal lamp can appear larger voltage difference in opening and closing moment, easily exceed the drive current of chip, cause chip damage.

Description

Technical Field

[0001] This utility model relates to the field of smart home appliance technology, and in particular to a circuit for an air-to-water generator. Background Technology

[0002] With the global water shortage becoming increasingly severe, especially in arid and polluted areas, the demand for safe and clean drinking water is constantly growing. Traditional methods of obtaining drinking water rely on surface water and groundwater, but these resources are already at risk of depletion or pollution in some areas. Air-to-water generators, as a new water resource extraction technology, can extract moisture from the air and convert it into purified, drinkable water, making them practically feasible.

[0003] An air-to-water generator is a machine that uses condensed water vapor in the air, followed by sterilization, to convert the moisture in the air into purified water that can be drunk directly. In existing technologies, the control circuits directly drive inductive loads such as the sterilizing lamp and water pump through a chip. The sterilizing lamp is used to sterilize the water vapor, and the water pump pumps the converted purified water to a water tank. A large voltage difference occurs between the water pump and the sterilizing lamp when they are turned on and off, which can easily exceed the chip's drive current, causing chip damage and resulting in a poor user experience. Utility Model Content

[0004] In order to overcome the defects of the existing technology, this utility model provides a circuit for an air-to-water generator to solve the above-mentioned problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a circuit for an air-to-water generator, including a load drive module, a power supply module and a main control chip U4; The load drive module includes an N-channel MOSFET MQ3, an N-channel MOSFET MQ2, a germicidal lamp, and a water pump; The gate (G) of the N-channel MOSFET MQ3 is electrically connected to the control output terminal M3 of the main control chip U4, the source (S) of the N-channel MOSFET MQ3 is grounded, the drain (D) of the N-channel MOSFET MQ3 is electrically connected to the negative terminal of the germicidal lamp, and the positive terminal of the germicidal lamp is electrically connected to the 24V output terminal of the power module. The gate (G) of the N-channel MOSFET MQ2 is electrically connected to the control output terminal MQ2 of the main control chip U4. The source (S) of the N-channel MOSFET MQ2 is grounded. The drain (D) of the N-channel MOSFET MQ2 is electrically connected to the negative terminal of the water pump. The positive terminal of the water pump is electrically connected to the 24V output terminal of the power module.

[0006] Preferably, the power module includes a rectifier bridge DB1, a transformer T1, and a Schottky diode Q4. The live wire and neutral wire are electrically connected to the input terminals AC1 and AC2 of the rectifier bridge DB1, respectively. The positive terminal of the rectifier bridge DB1 is electrically connected to the first end of the primary winding of the transformer T1. The negative terminal of the rectifier bridge DB1 is grounded, and the second end of the primary winding of the transformer T1 is grounded. The first end of the secondary winding of the transformer T1 is grounded, and the second end of the secondary winding of the transformer T1 is electrically connected to the positive terminal of the Schottky diode Q4. The negative terminal of the Schottky diode Q4 forms the 24V output terminal of the power module.

[0007] Optionally, the power module further includes a switching power supply chip U1, an optocoupler U3, and an N-channel MOSFET Q2; The negative terminal of the Schottky diode Q4 is electrically connected to the first terminal of the input side of the optocoupler U3, the second terminal of the input side of the optocoupler U3 is grounded, the first terminal of the output side of the optocoupler U3 is grounded, and the second terminal of the output side of the optocoupler is electrically connected to the voltage feedback terminal FB of the switching power supply chip U1. The drain (D) of the N-channel MOSFET Q2 is electrically connected to the first end of the primary winding of the transformer T1. The source (S) of the N-channel MOSFET Q2 is electrically connected to the first end of the sampling resistor and the current feedback terminal CS of the switching power supply chip U1. The second end of the sampling resistor is grounded. The gate (G) of the N-channel MOSFET Q2 is electrically connected to the gate output terminal GATE of the switching power supply chip U1.

[0008] Specifically, it also includes a driver chip U5 and a load control module. The driver chip U5 includes an input terminal IN1 and a corresponding output terminal OUT1, an input terminal IN2 and a corresponding output terminal OUT2, and an input terminal IN3 and a corresponding output terminal OUT3. The input terminal IN1 is electrically connected to the control output terminal IN1 of the main control chip U4, the input terminal IN2 is electrically connected to the control output terminal IN2 of the main control chip U4, and the input terminal IN3 is electrically connected to the control output terminal IN3 of the main control chip U4. The load control module includes relays K1, K2, and K3, a fan, a cold door valve, and a compressor motor; the output terminal OUT1 is electrically connected to the first terminal of the coil of relay K1, the output terminal OUT2 is electrically connected to the first terminal of the coil of relay K2, the output terminal OUT3 is electrically connected to the first terminal of the coil of relay K3, and the second terminals of the coils of relays K1, K2, and K3 are all electrically connected to the 24V output terminal of the power supply module. The neutral wire is electrically connected to one end of the fan through the normally open contact of the relay K1, and the other end of the fan is electrically connected to the live wire; the neutral wire is electrically connected to one end of the cold door valve through the normally open contact of the relay K2, and the other end of the cold door valve is electrically connected to the live wire; the neutral wire is electrically connected to one end of the compressor motor through the normally open contact of the relay K3, and the other end of the compressor motor is electrically connected to the live wire.

[0009] It is worth noting that the system also includes a detection module, which includes a low water level detection switch for the water tank, a high water level detection switch for the water tank, a coil temperature sensor, and a water tank temperature detection sensor. The first terminal of the low water level detection switch of the water tank is grounded, and the second terminal of the low water level detection switch of the water tank is electrically connected to the signal feedback terminal SWL1 of the main control chip U4. The first terminal of the high water level detection switch of the water tank is grounded, and the second terminal of the high water level detection switch of the water tank is electrically connected to the signal feedback terminal SWH1 of the main control chip U4. The signal output terminal of the coil temperature sensor is electrically connected to the signal feedback terminal NTC2 of the main control chip U4. The signal output terminal of the water tank temperature detection sensor is electrically connected to the signal feedback terminal NTC of the main control chip U4.

[0010] Preferably, the power module further includes an LDO step-down chip U2; The second end of the secondary winding of the transformer T1 is electrically connected to the positive terminal of the Schottky diode D3, the negative terminal of the Schottky diode D3 is electrically connected to the input terminal IN of the LDO step-down chip U2, the output terminal OUT of the LDO step-down chip U2 is electrically connected to the power input terminal VDD of the main control chip U4, and the ground terminal GND of the LDO step-down chip U2 is grounded.

[0011] The beneficial effects of this invention are as follows: In the circuit of the air-to-water generator, the main control chip U4 controls the on / off state of the corresponding N-channel MOSFET to control the connection or disconnection of inductive loads such as the germicidal lamp and water pump from the power module. Since the N-channel MOSFET conducts with majority carriers in its channel and has no minority carrier storage effect, it has strong resistance to voltage spikes from inductive loads. Even if there is a large voltage difference between the water pump and the germicidal lamp when they are turned on and off, it will not be directly applied to the main control chip U4, thereby avoiding chip damage and ensuring the user experience. Attached Figure Description

[0012] Figure 1 This is a circuit diagram of the load drive module in one embodiment of the present invention; Figure 2This is a circuit diagram of the main control chip in one embodiment of the present invention; Figure 3 This is a circuit diagram of the power supply module in one embodiment of the present invention; Figure 4 This is a circuit diagram of the driver chip in one embodiment of the present invention; Figure 5 This is a circuit diagram of the load control module in one embodiment of the present invention; Figure 6 This is a circuit diagram of the detection module in one embodiment of the present invention. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0014] like Figure 1-6 As shown, a circuit for an air-to-water generator includes a load drive module, a power supply module, and a main control chip U4. The load drive module includes an N-channel MOSFET MQ3, an N-channel MOSFET MQ2, a germicidal lamp, and a water pump; The gate (G) of the N-channel MOSFET MQ3 is electrically connected to the control output terminal M3 of the main control chip U4, the source (S) of the N-channel MOSFET MQ3 is grounded, the drain (D) of the N-channel MOSFET MQ3 is electrically connected to the negative terminal of the germicidal lamp, and the positive terminal of the germicidal lamp is electrically connected to the 24V output terminal of the power module. The gate (G) of the N-channel MOSFET MQ2 is electrically connected to the control output terminal MQ2 of the main control chip U4. The source (S) of the N-channel MOSFET MQ2 is grounded. The drain (D) of the N-channel MOSFET MQ2 is electrically connected to the negative terminal of the water pump. The positive terminal of the water pump is electrically connected to the 24V output terminal of the power module.

[0015] like Figure 1 and 2As shown, in the circuit of the air-to-water generator, the main control chip U4 controls the on / off state of the corresponding N-channel MOSFET to control the connection or disconnection of inductive loads such as the germicidal lamp and water pump from the power module. Because the N-channel MOSFET conducts with majority carriers and has no minority carrier storage effect, it has strong resistance to voltage spikes from inductive loads. Even if a large voltage difference occurs when the water pump and germicidal lamp are turned on and off, it will not be directly applied to the main control chip U4, thus avoiding chip damage and ensuring a better user experience. Resistors R32, R31, R46, and R39 are current-limiting resistors, and resistors R45, R29, R43, and R50 are pull-down resistors.

[0016] Preferably, the power module includes a rectifier bridge DB1, a transformer T1, and a Schottky diode Q4. The live wire and neutral wire are electrically connected to the input terminals AC1 and AC2 of the rectifier bridge DB1, respectively. The positive terminal of the rectifier bridge DB1 is electrically connected to the first end of the primary winding of the transformer T1. The negative terminal of the rectifier bridge DB1 is grounded, and the second end of the primary winding of the transformer T1 is grounded. The first end of the secondary winding of the transformer T1 is grounded, and the second end of the secondary winding of the transformer T1 is electrically connected to the positive terminal of the Schottky diode Q4. The negative terminal of the Schottky diode Q4 forms the 24V output terminal of the power module.

[0017] like Figure 3 As shown, the input AC power passes through fuse FUSE1, varistor ZNR1, thermistor NTC1, and safety capacitor CX1, then is filtered by common-mode inductor L1, and then becomes high-voltage DC power after passing through safety capacitor CX2, rectifier bridge DB1, and filter capacitor EC1. This DC power supplies the primary winding of transformer T1. The output of the secondary winding of transformer T1 is converted to 9V through Schottky diode D3, and the output of the secondary winding of transformer T1 is converted to 24V through Schottky diode Q4.

[0018] The circuit consists of resistors R1, R6, R7, R48, capacitor C1, and diode D2. The circuit consists of resistors R4, C2, R9, R26, and C16. The circuit consists of capacitors EC2 and C4 to filter out voltage spikes. Resistor R15 is a dummy load, and inductor L3 is a filter inductor.

[0019] Optionally, the power module further includes a switching power supply chip U1, an optocoupler U3, and an N-channel MOSFET Q2; The cathode of the Schottky diode Q4 is electrically connected to the first terminal of the input side of the optocoupler U3, and the second terminal of the input side of the optocoupler U3 is grounded. Specifically, the second terminal of the input side of the optocoupler U3 is grounded through the reference chip U6. Specifically, the reference chip U6 is a three-terminal adjustable parallel voltage regulator, model TL431 (YWUTC431), using an SOT-23 surface mount package. Pin 1 is the sampling terminal, pin 2 is the cathode terminal which serves as the output, and pin 3 is the anode terminal which is grounded. The first terminal of the output side of the optocoupler U3 is grounded, and the second terminal of the output side of the optocoupler is electrically connected to the voltage feedback terminal FB of the switching power supply chip U1. The drain (D) of the N-channel MOSFET Q2 is electrically connected to the first end of the primary winding of the transformer T1. The source (S) of the N-channel MOSFET Q2 is electrically connected to the first end of the sampling resistor and the current feedback terminal CS of the switching power supply chip U1. The second end of the sampling resistor is grounded. The gate (G) of the N-channel MOSFET Q2 is electrically connected to the gate output terminal GATE of the switching power supply chip U1.

[0020] The model number of the switching power supply chip U1 is OB5269CPA. Connecting resistors R53 and R19 to pin 1 of the switching power supply chip U1 can simulate specific temperature conditions, allowing the switching power supply chip U1 to be used for a long time.

[0021] Pin 2 of the switching power supply chip U1 is the output voltage stabilization feedback pin, i.e., the voltage feedback terminal FB. The 24V output from the negative terminal of the Schottky diode Q4 is fed to the reference chip U6 for comparison via a voltage divider resistor R58, R59, and R60. The diodes inside pins 1 and 2 (i.e., the first and second terminals on the input side) of the optocoupler U3 provide a light source signal to pins 3 and 4 (i.e., the first and second terminals on the output side) connected to ground. Thus, the feedback signal received by the switching power supply chip U1 from the optocoupler U3 determines whether the output of the Schottky diode Q4 is normal. Resistors R16 and R56 are current-limiting resistors, and capacitor C12 is a filter capacitor.

[0022] Pin 3 of the switching power supply chip U1 is the current detection port, i.e., the current feedback terminal CS. It is sampled by a resistor consisting of resistors R49, R20, R21, R22, and R8. Resistor R18 is a current-limiting circuit, and capacitor C9 is a filter capacitor. Pin 5 of the switching power supply chip U1 is the gate control port for the MOSFET, i.e., the gate output terminal GATE. The N-channel MOSFET Q2 controls the on / off state of the current flowing through it, thereby achieving overcurrent protection or current feedback control through the sampling resistor. Resistors R13 and R14 are current-limiting resistors, switching diode D5 controls the switching speed of the MOSFET, and resistor R25 is a pull-down resistor. Specifically, when the gate output terminal GATE of the switching power supply chip U1 outputs a high level, the drain and source terminals of the N-channel MOSFET Q2 conduct, allowing the current feedback terminal CS to collect the electrical signal applied to the sampling resistor.

[0023] Pin 6 of the switching power supply chip U1 is the power supply pin VDD for the feedback winding. When the output is stable, the switching power supply chip U1 is continuously powered through the external circuit. Specifically, the feedback voltage flows from the primary winding of transformer T1 through D4, through capacitor EC5, through switching transistor Q1, and then through capacitor EC4 and filter capacitor C5 to power pin 6. Among them, resistors R12 and R51 are current-limiting resistors, and Zener diode ZD1 regulates the voltage to 12V.

[0024] Specifically, it also includes a driver chip U5 and a load control module. The driver chip U5 includes an input terminal IN1 and a corresponding output terminal OUT1, an input terminal IN2 and a corresponding output terminal OUT2, and an input terminal IN3 and a corresponding output terminal OUT3. The input terminal IN1 is electrically connected to the control output terminal IN1 of the main control chip U4, the input terminal IN2 is electrically connected to the control output terminal IN2 of the main control chip U4, and the input terminal IN3 is electrically connected to the control output terminal IN3 of the main control chip U4. The load control module includes relays K1, K2, and K3, a fan, a cold door valve, and a compressor motor; the output terminal OUT1 is electrically connected to the first terminal of the coil of relay K1, the output terminal OUT2 is electrically connected to the first terminal of the coil of relay K2, the output terminal OUT3 is electrically connected to the first terminal of the coil of relay K3, and the second terminals of the coils of relays K1, K2, and K3 are all electrically connected to the 24V output terminal of the power supply module. The neutral wire is electrically connected to one end of the fan through the normally open contact of the relay K1, and the other end of the fan is electrically connected to the live wire; the neutral wire is electrically connected to one end of the cold door valve through the normally open contact of the relay K2, and the other end of the cold door valve is electrically connected to the live wire; the neutral wire is electrically connected to one end of the compressor motor through the normally open contact of the relay K3, and the other end of the compressor motor is electrically connected to the live wire.

[0025] like Figure 4 As shown, in this embodiment, the driver chip U5 is model ULN2003G. After the input terminal IN1 of the driver chip U5 receives the high-level signal corresponding to the main control chip U4, it will form a low-level signal at its output terminal OUT1. Similarly, after the input terminal IN2 receives the high-level signal, the output terminal OUT2 will form a low-level signal. After the input terminal IN3 receives the high-level signal, the output terminal OUT3 will form a low-level signal.

[0026] like Figure 4 and 5 As shown, after a low-level signal is generated at output terminal OUT1, the coil of relay K1 is energized, and the corresponding normally open contact closes, thereby energizing the fan to operate. After a low-level signal is generated at output terminal OUT2, the coil of relay K2 is energized, and the corresponding normally open contact closes, thereby energizing and opening the cold door valve. After a low-level signal is generated at output terminal OUT3, the coil of relay K3 is energized, and the corresponding normally open contact closes, thereby energizing the compressor motor to operate and condense water molecules in the air. In this embodiment, the fan plays a heat dissipation role within the entire machine. When the compressor motor operates for cooling, it generates a large amount of heat, and starting the fan helps to dissipate this heat. The cold door valve acts as a switch; after the compressor motor condenses water molecules in the air and obtains cold water, opening the cold door valve allows cold water to flow out.

[0027] It is worth noting that, such as Figure 6 As shown, it also includes a detection module, which includes a low water level detection switch for the water tank, a high water level detection switch for the water tank, a coil temperature sensor, and a water tank temperature detection sensor. The first terminal of the low water level detection switch of the water tank is grounded, and the second terminal of the low water level detection switch of the water tank is electrically connected to the signal feedback terminal SWL1 of the main control chip U4. The first terminal of the high water level detection switch of the water tank is grounded, and the second terminal of the high water level detection switch of the water tank is electrically connected to the signal feedback terminal SWH1 of the main control chip U4. The signal output terminal of the coil temperature sensor is electrically connected to the signal feedback terminal NTC2 of the main control chip U4. The signal output terminal of the water tank temperature detection sensor is electrically connected to the signal feedback terminal NTC of the main control chip U4.

[0028] The main control chip U4 has the model number CMS79F738. As a microcomputer control chip, it detects the low and high water levels in the water tank, the coil temperature, and the water tank temperature. It then outputs commands to enable the ultraviolet sterilization lamp to sterilize the water and the water pump to pump water into the water tank.

[0029] Preferably, the power module further includes an LDO step-down chip U2; The second end of the secondary winding of the transformer T1 is electrically connected to the positive terminal of the Schottky diode D3, the negative terminal of the Schottky diode D3 is electrically connected to the input terminal IN of the LDO step-down chip U2, the output terminal OUT of the LDO step-down chip U2 is electrically connected to the power input terminal VDD of the main control chip U4, and the ground terminal GND of the LDO step-down chip U2 is grounded.

[0030] The 9V voltage output from the secondary winding of transformer T1, after passing through Schottky diode D3, is output as a stable 5V voltage through pin 3 of the three-terminal regulator of LDO step-down chip U2. Resistors R44 and R11 are dummy loads, and capacitors EC7, C18, EC3, and C10 are filter capacitors.

[0031] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A circuit for an air-to-water generator, characterized in that: Includes a load drive module, a power supply module, and a main control chip U4; The load drive module includes an N-channel MOSFET MQ3, an N-channel MOSFET MQ2, a germicidal lamp, and a water pump; The gate (G) of the N-channel MOSFET MQ3 is electrically connected to the control output terminal M3 of the main control chip U4, the source (S) of the N-channel MOSFET MQ3 is grounded, the drain (D) of the N-channel MOSFET MQ3 is electrically connected to the negative terminal of the germicidal lamp, and the positive terminal of the germicidal lamp is electrically connected to the 24V output terminal of the power module. The gate (G) of the N-channel MOSFET MQ2 is electrically connected to the control output terminal MQ2 of the main control chip U4. The source (S) of the N-channel MOSFET MQ2 is grounded. The drain (D) of the N-channel MOSFET MQ2 is electrically connected to the negative terminal of the water pump. The positive terminal of the water pump is electrically connected to the 24V output terminal of the power module.

2. The circuit of an air-to-water generator according to claim 1, characterized in that: The power module includes a rectifier bridge DB1, a transformer T1, and a Schottky diode Q4. The live wire and neutral wire are electrically connected to the input terminals AC1 and AC2 of the rectifier bridge DB1, respectively. The positive terminal of the rectifier bridge DB1 is electrically connected to the first end of the primary winding of the transformer T1. The negative terminal of the rectifier bridge DB1 is grounded, and the second end of the primary winding of the transformer T1 is grounded. The first end of the secondary winding of the transformer T1 is grounded, and the second end of the secondary winding of the transformer T1 is electrically connected to the positive terminal of the Schottky diode Q4. The negative terminal of the Schottky diode Q4 forms the 24V output terminal of the power module.

3. The circuit of an air-to-water generator according to claim 2, characterized in that: The power module also includes a switching power supply chip U1, an optocoupler U3, and an N-channel field-effect transistor Q2; The negative terminal of the Schottky diode Q4 is electrically connected to the first terminal of the input side of the optocoupler U3, the second terminal of the input side of the optocoupler U3 is grounded, the first terminal of the output side of the optocoupler U3 is grounded, and the second terminal of the output side of the optocoupler is electrically connected to the voltage feedback terminal FB of the switching power supply chip U1. The drain (D) of the N-channel MOSFET Q2 is electrically connected to the first end of the primary winding of the transformer T1. The source (S) of the N-channel MOSFET Q2 is electrically connected to the first end of the sampling resistor and the current feedback terminal CS of the switching power supply chip U1. The second end of the sampling resistor is grounded. The gate (G) of the N-channel MOSFET Q2 is electrically connected to the gate output terminal GATE of the switching power supply chip U1.

4. The circuit of an air-to-water generator according to claim 1, characterized in that: It also includes a driver chip U5 and a load control module. The driver chip U5 includes an input terminal IN1 and a corresponding output terminal OUT1, an input terminal IN2 and a corresponding output terminal OUT2, and an input terminal IN3 and a corresponding output terminal OUT3. The input terminal IN1 is electrically connected to the control output terminal IN1 of the main control chip U4, the input terminal IN2 is electrically connected to the control output terminal IN2 of the main control chip U4, and the input terminal IN3 is electrically connected to the control output terminal IN3 of the main control chip U4. The load control module includes relays K1, K2, and K3, a fan, a cold door valve, and a compressor motor; the output terminal OUT1 is electrically connected to the first terminal of the coil of relay K1, the output terminal OUT2 is electrically connected to the first terminal of the coil of relay K2, the output terminal OUT3 is electrically connected to the first terminal of the coil of relay K3, and the second terminals of the coils of relays K1, K2, and K3 are all electrically connected to the 24V output terminal of the power supply module. The neutral wire is electrically connected to one end of the fan through the normally open contact of the relay K1, and the other end of the fan is electrically connected to the live wire; the neutral wire is electrically connected to one end of the cold door valve through the normally open contact of the relay K2, and the other end of the cold door valve is electrically connected to the live wire; the neutral wire is electrically connected to one end of the compressor motor through the normally open contact of the relay K3, and the other end of the compressor motor is electrically connected to the live wire.

5. The circuit of an air-to-water generator according to claim 1, characterized in that: It also includes a detection module, which includes a low water level detection switch for the water tank, a high water level detection switch for the water tank, a coil temperature sensor, and a water tank temperature detection sensor. The first terminal of the low water level detection switch of the water tank is grounded, and the second terminal of the low water level detection switch of the water tank is electrically connected to the signal feedback terminal SWL1 of the main control chip U4. The first terminal of the high water level detection switch of the water tank is grounded, and the second terminal of the high water level detection switch of the water tank is electrically connected to the signal feedback terminal SWH1 of the main control chip U4. The signal output terminal of the coil temperature sensor is electrically connected to the signal feedback terminal NTC2 of the main control chip U4. The signal output terminal of the water tank temperature detection sensor is electrically connected to the signal feedback terminal NTC of the main control chip U4.

6. The circuit of an air-to-water generator according to claim 2, characterized in that: The power module also includes an LDO step-down chip U2; The second end of the secondary winding of the transformer T1 is electrically connected to the positive terminal of the Schottky diode D3, the negative terminal of the Schottky diode D3 is electrically connected to the input terminal IN of the LDO step-down chip U2, the output terminal OUT of the LDO step-down chip U2 is electrically connected to the power input terminal VDD of the main control chip U4, and the ground terminal GND of the LDO step-down chip U2 is grounded.

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