Electric water heater power supply control system

Abstract

The utility model discloses a power supply control system of an electric water heater, which relates to the technical field of electric water heaters and comprises a power supply control module used for being connected with commercial power and performing power supply control; the power supply processing module is used for rectification filtering and voltage stabilization processing; the temperature control module is used for controlling the electric heating module to perform electric heating when the sampled temperature signal is smaller than a temperature threshold value; the solar power supply module is used for photoelectric conversion, voltage regulation, energy storage, discharge and inversion; the voltage detection control module is used for carrying out full-power detection on the solar power supply module; and the solar trigger module is used for controlling the solar power supply module to supply power and disconnecting the power supply control module when the temperature reaches a set first voltage threshold value and the solar power supply module is fully charged. The electric water heater power supply control system controls the power supply control module and the solar power supply module to switch power supply according to the hot water temperature condition and the electric quantity state of the solar power supply module, energy-saving power supply is achieved, and power supply cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric water heaters, in particular to a power supply control system for electric water heaters. Background Art

[0002] Electric water heaters are one of the three major water heaters along with gas water heaters and solar water heaters. Compared with gas water heaters and solar water heaters, electric water heaters have the advantages of being clean, low noise, and less affected by weather, and are favored by many people. Electric water heaters in the prior art generally perform insulation treatment when the water temperature stored inside reaches the set temperature value. Since the insulation time may be long, it will always require AC power supply, resulting in excessively high power supply costs, and therefore needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides an electric water heater power supply control system to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An electric water heater power supply control system comprises: a power supply control module, a power supply processing module, a temperature control module, a solar power supply module, a voltage detection control module, a solar trigger module and an electric heating module;

[0006] A power control module, connected to the power processing module and the solar trigger module, for receiving the mains power and transmitting the mains power to the power processing module, and stopping the transmission of the mains power when receiving the trigger signal output by the solar trigger module;

[0007] A power processing module, connected to the solar power supply module, for rectifying, filtering and stabilizing the AC power transmitted by the power control module or the AC power output by the solar power supply module and outputting the first power;

[0008] a temperature control module, connected to the power processing module, for receiving the first electric energy and a set temperature threshold, performing temperature detection and outputting a temperature signal, outputting a first control signal when the temperature signal is less than the temperature threshold, and stopping outputting the first control signal when the temperature signal is greater than the temperature threshold;

[0009] A solar power supply module is connected to the solar trigger module and is used for photoelectric conversion, voltage regulation, energy storage and discharge. When receiving a trigger signal output by the solar trigger module, the released electric energy is inverted and outputs AC electric energy;

[0010] A voltage detection control module is connected to the solar power supply module, and is used to detect the amount of electric energy stored in the solar power supply module and output a first electric amount signal, set a full-charge threshold and a discharge threshold, and output a second control signal when the first electric amount signal is greater than the full-charge threshold, and stop outputting the second control signal when the first electric amount signal is lower than the discharge threshold;

[0011] A solar trigger module, connected to the temperature control module and the voltage detection control module, for reducing the voltage of the temperature threshold and outputting a first voltage threshold, outputting a third control signal when the temperature signal is greater than the first voltage threshold, and outputting a trigger signal when the second control signal is received during the output of the third control signal;

[0012] The electric heating module is connected to the temperature control module, the solar power supply module and the power control module, and is used to receive AC power or AC power and start electric heating when receiving a first control signal.

[0013] As a further solution of the utility model: the power control module includes a power port and a first relay switch; the power processing module includes a first transformer, a first rectifier, a first capacitor, a first voltage regulator and a second capacitor;

[0014] Preferably, the first end and the second end of the power port are respectively connected to the first moving end and the second moving end of the first relay switch, the first static end and the second static end of the first relay switch are respectively connected to the first end and the second end of the primary side of the first transformer, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to the third end of the first voltage regulator and is connected to the fourth end of the first rectifier, the second end of the first voltage regulator, one end of the second capacitor and the ground through the first capacitor, and the first end of the first voltage regulator is connected to the other end of the second capacitor.

[0015] As a further solution of the utility model: the temperature control module includes a first thermistor, a first resistor, a second resistor, a third resistor, a first potentiometer and a first comparator;

[0016] Preferably, one end of the first thermistor is connected to the first end of the first voltage regulator and is connected to one end of the first potentiometer through the second resistor, the second end of the first thermistor is connected to the inverting end of the first comparator and is grounded through the first resistor, the slider end of the first potentiometer is connected to the non-inverting end of the first comparator, the other end of the first potentiometer is grounded through the third resistor, and the output end of the first comparator is connected to the electric heating module.

[0017] As a further solution of the utility model: the electric heating module includes a first switch tube, a second relay, a second relay switch and an electric heater;

[0018] Preferably, the base of the first switching tube is connected to the output end of the first comparator, the collector of the first switching tube is connected to the first end of the second relay, the emitter of the first switching tube is grounded, the other end of the second relay is connected to the first end of the first voltage regulator, the first moving end and the second moving end of the second relay switch are respectively connected to the first end and the second end of the primary side of the first transformer, and the first static end and the second static end of the second relay switch are respectively connected to the first end and the second end of the electric heater.

[0019] As a further solution of the utility model: the solar trigger module includes a fourth resistor, a first diode, a second comparator and a first logic chip; the power control module also includes a fifth resistor, a second switch tube and a first relay;

[0020] Preferably, the in-phase end of the second comparator is connected to the second end of the first thermistor, the inverting end of the second comparator is connected to the cathode of the first diode, the anode of the first diode is connected to the slider end of the first potentiometer through a fourth resistor, the output end of the second comparator is connected to the A end of the first logic chip, the B end of the first logic chip is connected to the voltage detection control module, the F end of the first logic chip is connected to the base of the second switch tube through a fifth resistor, the collector of the second switch tube is connected to one end of the first relay, the emitter of the second switch tube is grounded, and the other end of the first relay is connected to the first end of the first voltage regulator.

[0021] As a further solution of the utility model: the solar power supply module includes a solar device, a solar cell, a first power tube and an inverter device;

[0022] Preferably, the first end of the solar device is connected to the first end of the solar cell and the drain of the first power tube, the source of the first power tube is connected to the first input end of the inverter device, the second input end of the inverter device, the second end of the solar cell and the second end of the solar device are all grounded, the first output end and the second output end of the inverter device are respectively connected to the first end of the primary side of the first transformer and the second end of the primary side of the first transformer, and the gate of the first power tube is connected to the F end of the first logic chip.

[0023] As a further solution of the utility model: the voltage detection control module includes a sixth resistor, a seventh resistor, a first power supply, an eighth resistor, a ninth resistor, a third comparator, a tenth resistor and a third switch tube;

[0024] Preferably, one end of the sixth resistor is connected to the first end of the solar cell, the other end of the sixth resistor is connected to the in-phase end of the third comparator and is connected to the second end and the ground of the solar cell through the seventh resistor, the inverting end of the third comparator is connected to one end of the ninth resistor and the collector of the third switch tube and is connected to the first power supply through the eighth resistor, the output end of the third comparator is connected to the B end of the first logic chip and the base of the third switch tube, and the emitter of the third switch tube is connected to the other end of the ninth resistor and the ground through the tenth resistor.

[0025] Compared with the prior art, the beneficial effects of the utility model are as follows: the power supply control system of the electric water heater of the utility model performs temperature detection by the temperature control module, controls the electric heating module to perform electric heating and insulation treatment according to the set temperature threshold, performs photoelectric conversion and energy storage by the solar power supply module, and when the stored electric quantity reaches the full power threshold set by the voltage detection control module and the heating temperature reaches the first voltage threshold set by the solar trigger module, the power supply of the power supply control module is disconnected, the stored electric energy is released by the solar power supply module and the released electric energy is inverted to perform power supply work and maintain the electric energy required for heating and insulation, and when the stored electric energy is lower than the set discharge threshold or the temperature is lower than the first voltage threshold, the power supply control module is used to supply power again, thereby realizing energy-saving power supply and reducing power supply costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 The present invention provides a schematic block diagram of a power supply control system for an electric water heater.

[0028] Figure 2 A circuit diagram of an electric water heater power supply control system provided in an example of the utility model.

[0029] Figure 3 This is a connection circuit diagram of a voltage detection control module provided in an example of the utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In one embodiment, see Figure 1 , an electric water heater power supply control system, comprising: a power supply control module 1, a power supply processing module 2, a temperature control module 3, a solar power supply module 4, a voltage detection control module 5, a solar trigger module 6 and an electric heating module 7;

[0032] Specifically, the power control module 1 is connected to the power processing module 2 and the solar trigger module 6, and is used to access the mains power and transmit the mains power to the power processing module 2, and stop transmitting the mains power when receiving the trigger signal output by the solar trigger module 6;

[0033] The power processing module 2 is connected to the solar power supply module 4 and is used to rectify, filter and perform temperature processing on the AC power energy transmitted by the power control module 1 or the AC power energy output by the solar power supply module 4 and output the first power;

[0034] The temperature control module 3 is connected to the power processing module 2, and is used to receive the first electric energy and set the temperature threshold, perform temperature detection and output a temperature signal, output a first control signal when the temperature signal is less than the temperature threshold, and stop outputting the first control signal when the temperature signal is greater than the temperature threshold;

[0035] The solar power supply module 4 is connected to the solar trigger module 6 and is used for performing photoelectric conversion, voltage regulation, energy storage and discharge. When receiving the trigger signal output by the solar trigger module 6, the released electric energy is inverted and output AC electric energy;

[0036] A voltage detection control module 5 is connected to the solar power supply module 4, and is used to detect the amount of electric energy stored in the solar power supply module 4 and output a first electric energy signal, set a full-charge threshold and a discharge threshold, and output a second control signal when the first electric energy signal is greater than the full-charge threshold, and stop outputting the second control signal when the first electric energy signal is lower than the discharge threshold;

[0037] The solar trigger module 6 is connected to the temperature control module 3 and the voltage detection control module 5, and is used to perform voltage reduction processing on the temperature threshold and output a first voltage threshold, and output a third control signal when the temperature signal is greater than the first voltage threshold, and output a trigger signal when the second control signal is received during the output of the third control signal;

[0038] The electric heating module 7 is connected to the temperature control module 3, the solar power supply module 4 and the power control module 1, and is used to receive AC power or mains power and start electric heating when receiving a first control signal.

[0039] In a specific embodiment, the power control module 1 may adopt a power control circuit composed of a power port, a relay, a triode, etc., which may be connected to the mains electricity and control the transmission state of the mains electricity; the power processing module 2 may adopt a power processing circuit composed of a transformer, a rectifier, a voltage stabilizer, etc., which may step down, rectify and filter the input electric energy; the temperature control module 3 may adopt a temperature control circuit composed of a thermistor, a comparator, a resistor, etc., which may detect the temperature of the water stored in the electric water heater, set a temperature threshold, and determine the relationship between the detected temperature signal and the temperature threshold; the solar power supply module 4 may adopt a solar power supply circuit composed of a solar device, a solar cell, an inverter, etc., to perform photoelectric conversion, stabilize the converted electric energy, and store the stabilized electric energy. , releasing the stored electric energy and inverting the released electric energy; the voltage detection control module 5 can adopt a voltage detection control circuit composed of resistors, comparators, transistors, etc., which can sample the power of the solar power supply module 4 and determine the size of the sampled signal and the set full power threshold or charging threshold; the solar trigger module 6 can adopt a solar trigger circuit composed of diodes, comparators, logic chips, etc., which can step down the temperature threshold and output a first voltage threshold. When the detected temperature exceeds the first voltage threshold and the solar power supply module 4 is in a fully charged state, the switching power supply of the solar power supply module 4 and the power control module 1 is controlled; the electric heating module 7 can adopt an electric heating circuit composed of relays, transistors, electric heaters, etc. to heat the water stored in the electric water heater.

[0040] In another embodiment, see Figure 1 , Figure 2 and Figure 3 , the power control module 1 includes a power port and a first relay switch K1-1; the power processing module 2 includes a first transformer B1, a first rectifier T1, a first capacitor C1, a first regulator IC1 and a second capacitor C2;

[0041] Specifically, the first end and the second end of the power port are respectively connected to the first moving end and the second moving end of the first relay switch K1-1, the first static end and the second static end of the first relay switch K1-1 are respectively connected to the first end and the second end of the primary side of the first transformer B1, the first end and the second end of the secondary side of the first transformer B1 are respectively connected to the first end and the second end of the first rectifier T1, the third end of the first rectifier T1 is connected to the third end of the first voltage regulator IC1 and is connected to the fourth end of the first rectifier T1, the second end of the first voltage regulator IC1, one end of the second capacitor C2 and the ground through the first capacitor C1, and the first end of the first voltage regulator IC1 is connected to the other end of the second capacitor C2.

[0042] In a specific embodiment, the first relay switch K1 - 1 may be a double-pole double-throw switch and a normally closed switch; the first voltage regulator IC1 may be a 7812 voltage regulator.

[0043] Further, the temperature control module 3 includes a first thermistor NTC, a first resistor R1, a second resistor R2, a third resistor R3, a first potentiometer RP1 and a first comparator A1;

[0044] Specifically, one end of the first thermistor NTC is connected to the first end of the first voltage regulator IC1 and is connected to one end of the first potentiometer RP1 through the second resistor R2, the second end of the first thermistor NTC is connected to the inverting end of the first comparator A1 and is grounded through the first resistor R1, the slider end of the first potentiometer is connected to the non-inverting end of the first comparator A1, the other end of the first potentiometer RP1 is grounded through the third resistor R3, and the output end of the first comparator A1 is connected to the electric heating module 7.

[0045] In a specific embodiment, the first thermistor NTC can be a thermistor with a negative temperature coefficient; the second resistor R2, the first potentiometer RP1 and the third resistor R3 set the temperature threshold; the first comparator A1 can be a LM358 comparator.

[0046] Furthermore, the electric heating module 7 includes a first switch tube V1, a second relay K2, a second relay switch K2-1 and an electric heater;

[0047] Specifically, the base of the first switch tube V1 is connected to the output end of the first comparator A1, the collector of the first switch tube V1 is connected to the first end of the second relay K2, the emitter of the first switch tube V1 is grounded, the other end of the second relay K2 is connected to the first end of the first voltage regulator IC1, the first moving end and the second moving end of the second relay switch K2-1 are respectively connected to the first end and the second end of the primary side of the first transformer B1, and the first static end and the second static end of the second relay switch K2-1 are respectively connected to the first end and the second end of the electric heater.

[0048] In a specific embodiment, the first switch tube V1 may be an NPN transistor; the second relay switch K2-1 may be a double-pole double-throw switch and is a normally open switch, which is controlled by the second relay K2 through magnetic attraction.

[0049] Furthermore, the solar trigger module 6 includes a fourth resistor R4, a first diode D1, a second comparator A2 and a first logic chip IC2; the power control module 1 also includes a fifth resistor R5, a second switch tube V2 and a first relay K1;

[0050] Specifically, the in-phase end of the second comparator A2 is connected to the second end of the first thermistor NTC, the inverting end of the second comparator A2 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the slider end of the first potentiometer RP1 through the fourth resistor R4, the output end of the second comparator A2 is connected to the A end of the first logic chip IC2, the B end of the first logic chip IC2 is connected to the voltage detection control module 5, the F end of the first logic chip IC2 is connected to the base of the second switch tube V2 through the fifth resistor R5, the collector of the second switch tube V2 is connected to one end of the first relay K1, the emitter of the second switch tube V2 is grounded, and the other end of the first relay K1 is connected to the first end of the first regulator IC1.

[0051] In a specific embodiment, the second comparator A2 can be an LM358 comparator; the fourth resistor R4 and the first diode D1 step down the set temperature threshold and provide a first voltage threshold; the first logic chip IC2 can be an AND gate chip; the second switch tube V2 can be an NPN transistor; the first relay K1 controls the closing of the first relay switch K1-1 by magnetic attraction.

[0052] Furthermore, the solar power supply module 4 includes a solar device, a solar cell, a first power tube Q1 and an inverter device;

[0053] Specifically, the first end of the solar device is connected to the first end of the solar cell and the drain of the first power tube Q1, the source of the first power tube Q1 is connected to the first input end of the inverter device, the second input end of the inverter device, the second end of the solar cell and the second end of the solar device are all grounded, the first output end and the second output end of the inverter device are respectively connected to the first end of the primary side of the first transformer B1 and the second end of the primary side of the first transformer B1, and the gate of the first power tube Q1 is connected to the F end of the first logic chip IC2.

[0054] In a specific embodiment, the solar device can be composed of a solar panel and a boost circuit to perform photoelectric conversion and voltage regulation; the solar cell can be a battery pack; the inverter can be a single-phase full-bridge inverter; the first power tube Q1 can be an N-channel field effect tube.

[0055] Further, the voltage detection control module 5 includes a sixth resistor R6, a seventh resistor R7, a first power supply VCC1, an eighth resistor R8, a ninth resistor R9, a third comparator A3, a tenth resistor R10 and a third switch tube V3;

[0056] Specifically, one end of the sixth resistor R6 is connected to the first end of the solar cell, the other end of the sixth resistor R6 is connected to the in-phase end of the third comparator A3 and is connected to the second end and the ground end of the solar cell through the seventh resistor R7, the inverting end of the third comparator A3 is connected to one end of the ninth resistor R9 and the collector of the third switch tube V3 and is connected to the first power supply VCC1 through the eighth resistor R8, the output end of the third comparator A3 is connected to the B end of the first logic chip IC2 and the base of the third switch tube V3, and the emitter of the third switch tube V3 is connected to the other end of the ninth resistor R9 and the ground end through the tenth resistor R10.

[0057] In a specific embodiment, the sixth resistor R6 and the seventh resistor R7 perform power sampling; the first power supply VCC1, the eighth resistor R8 and the ninth resistor R9 set the full power threshold, and when the third switch tube V3 is turned on, the discharge threshold is set in conjunction with the tenth resistor R10, wherein the third switch tube V3 can be an NPN transistor; the third comparator A3 can be an LM358 comparator.

[0058] In a power supply control system for an electric water heater in this embodiment, the mains power is connected to the power port, the first relay switch K1-1 transmits the mains power to the first transformer B1 for isolation and voltage transformation, and then the first rectifier T1, the first capacitor C1, the first voltage regulator IC1 and the second capacitor C2 perform rectification, filtering and voltage stabilization, the first thermistor NTC detects the temperature of the water stored in the electric water heater, when the temperature rises, the resistance of the first thermistor NTC decreases, when the detected temperature signal is less than the temperature threshold set by the second resistor R2, the first potentiometer RP1 and the third resistor R3, the first comparator A1 outputs a high level and controls the first switch tube V1 to turn on, and at the same time the fourth resistor R4 and the first diode D1 perform voltage reduction processing on the temperature threshold and provide a first voltage threshold, so that the second relay K2 is energized and controls the second relay switch K2-1 to close, the electric heater heats the water stored in the electric water heater, and at the same time the solar device performs photoelectric conversion and voltage regulation, and The solar cell is used for energy storage. When the stored amount of electricity is greater than the full charge threshold value set by the first power supply VCC1, the eighth resistor R8 and the ninth resistor R9, the third comparator A3 outputs a high level to control the third switch tube V3 to be turned on. At this time, the discharge threshold enters operation, and the B terminal of the first logic chip IC2 becomes a high level until the detected temperature exceeds the first voltage threshold. The second comparator A2 outputs a high level. At this time, the F terminal of the first logic chip IC2 outputs a high level, and the second switch tube V2 and the first power tube Q1 are turned on, so that the electric energy released by the solar energy is inverted by the inverter device to supply power to the first transformer B1 and the electric heater. The first relay K1 is energized to control the first relay switch K1-1 to be disconnected, and the transmission of the mains electricity is stopped. Then, the solar cell supplies power when the electric water heater is in a heat preservation state until the electric water heater is used. After the water temperature is lower than the first voltage threshold or the amount of electricity of the solar cell is lower than the discharge threshold, the power control module 1 will again provide the mains electricity.

[0059] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric water heater power supply control system, characterized in that: The electric water heater power supply control system includes: a power supply control module, a power supply processing module, a temperature control module, a solar power supply module, a voltage detection control module, a solar trigger module and an electric heating module; The power control module is connected to the power processing module and the solar trigger module, and is used to access the mains power and transmit the mains power to the power processing module, and stop transmitting the mains power when receiving the trigger signal output by the solar trigger module; The power processing module is connected to the solar power supply module and is used to rectify, filter and stabilize the AC power transmitted by the power control module or the AC power output by the solar power supply module and output the first power; The temperature control module is connected to the power processing module, and is used to receive the first electric energy and the set temperature threshold, perform temperature detection and output a temperature signal, output a first control signal when the temperature signal is less than the temperature threshold, and stop outputting the first control signal when the temperature signal is greater than the temperature threshold; The solar power supply module is connected to the solar trigger module and is used to perform photoelectric conversion, voltage regulation, energy storage and discharge. When receiving the trigger signal output by the solar trigger module, the released electric energy is inverted and output AC electric energy; The voltage detection control module is connected to the solar power supply module, and is used to detect the amount of electric energy stored in the solar power supply module and output a first electric amount signal, set a full power threshold and a discharge threshold, and output a second control signal when the first electric amount signal is greater than the full power threshold, and stop outputting the second control signal when the first electric amount signal is lower than the discharge threshold; The solar trigger module is connected to the temperature control module and the voltage detection control module, and is used to perform voltage reduction processing on the temperature threshold and output a first voltage threshold, output a third control signal when the temperature signal is greater than the first voltage threshold, and output a trigger signal when the second control signal is received during the output of the third control signal; The electric heating module is connected to the temperature control module, the solar power supply module and the power control module, and is used to receive AC power or AC power and start electric heating when receiving a first control signal.

2. The electric water heater power supply control system according to claim 1, characterized in that: The power control module includes a power port and a first relay switch; the power processing module includes a first transformer, a first rectifier, a first capacitor, a first voltage regulator and a second capacitor; The first end and the second end of the power port are respectively connected to the first moving end and the second moving end of the first relay switch, the first static end and the second static end of the first relay switch are respectively connected to the first end and the second end of the primary side of the first transformer, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to the third end of the first voltage regulator and connected to the fourth end of the first rectifier, the second end of the first voltage regulator, one end of the second capacitor and the ground through the first capacitor, and the first end of the first voltage regulator is connected to the other end of the second capacitor.

3. The electric water heater power supply control system according to claim 2, characterized in that: The temperature control module includes a first thermistor, a first resistor, a second resistor, a third resistor, a first potentiometer and a first comparator; One end of the first thermistor is connected to the first end of the first voltage regulator and is connected to one end of the first potentiometer through the second resistor, the second end of the first thermistor is connected to the inverting end of the first comparator and is grounded through the first resistor, the slider end of the first potentiometer is connected to the non-inverting end of the first comparator, the other end of the first potentiometer is grounded through the third resistor, and the output end of the first comparator is connected to the electric heating module.

4. The electric water heater power supply control system according to claim 3, characterized in that: The electric heating module includes a first switch tube, a second relay, a second relay switch and an electric heater; The base of the first switch tube is connected to the output end of the first comparator, the collector of the first switch tube is connected to the first end of the second relay, the emitter of the first switch tube is grounded, the other end of the second relay is connected to the first end of the first voltage stabilizer, the first moving end and the second moving end of the second relay switch are respectively connected to the first end and the second end of the primary side of the first transformer, and the first static end and the second static end of the second relay switch are respectively connected to the first end and the second end of the electric heater.

5. The electric water heater power supply control system according to claim 4, characterized in that: The solar trigger module includes a fourth resistor, a first diode, a second comparator and a first logic chip; the power control module also includes a fifth resistor, a second switch tube and a first relay; The in-phase end of the second comparator is connected to the second end of the first thermistor, the inverting end of the second comparator is connected to the cathode of the first diode, the anode of the first diode is connected to the slider end of the first potentiometer through a fourth resistor, the output end of the second comparator is connected to the A end of the first logic chip, the B end of the first logic chip is connected to the voltage detection control module, the F end of the first logic chip is connected to the base of the second switch tube through a fifth resistor, the collector of the second switch tube is connected to one end of the first relay, the emitter of the second switch tube is grounded, and the other end of the first relay is connected to the first end of the first regulator.

6. The electric water heater power supply control system according to claim 5, characterized in that: The solar power supply module includes a solar device, a solar cell, a first power tube and an inverter device; The first end of the solar device is connected to the first end of the solar cell and the drain of the first power tube, the source of the first power tube is connected to the first input end of the inverter device, the second input end of the inverter device, the second end of the solar cell and the second end of the solar device are all grounded, the first output end and the second output end of the inverter device are respectively connected to the first end of the primary side of the first transformer and the second end of the primary side of the first transformer, and the gate of the first power tube is connected to the F end of the first logic chip.

7. The electric water heater power supply control system according to claim 6, characterized in that: The voltage detection control module includes a sixth resistor, a seventh resistor, a first power supply, an eighth resistor, a ninth resistor, a third comparator, a tenth resistor and a third switch tube; One end of the sixth resistor is connected to the first end of the solar cell, the other end of the sixth resistor is connected to the in-phase end of the third comparator and is connected to the second end and the ground of the solar cell through the seventh resistor, the inverting end of the third comparator is connected to one end of the ninth resistor and the collector of the third switch tube and is connected to the first power supply through the eighth resistor, the output end of the third comparator is connected to the B end of the first logic chip and the base of the third switch tube, and the emitter of the third switch tube is connected to the other end of the ninth resistor and the ground through the tenth resistor.

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