Over-temperature and circuit protection system for dual-energy water heater

Abstract

The application provides a kind of over-temperature and circuit protection system of dual-energy water heater.Over-temperature sensing module: for the over-temperature sensing of waterway components and circuit devices of dual-energy water heater, obtaining over-temperature sensing data, and determining whether there is waterway over-temperature or circuit over-temperature based on over-temperature sensing data;Dual-energy control module: for opening and closing control of dual-energy water heater gas switch and circuit switch according to over-temperature sensing data;Circuit test module: for periodic refreshing of the circuit of dual-energy water heater, and determining whether the refreshed circuit has operation abnormality when the circuit is over-temperature;Power control module: for controlling the gas supply amount of dual-energy water heater gas valve or the power supply voltage of circuit power supply end according to opening and closing control and operation abnormality.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and in particular to an overheat and circuit protection system for a dual-energy water heater. Background Technology

[0002] Currently, water heaters are common household appliances. Based on the energy source used, they can be categorized into single-energy water heaters such as gas water heaters, electric water heaters, air source heat pump water heaters, and solar water heaters. With economic development and improved living standards, dual-energy water heaters that support the use of two energy sources are becoming increasingly widespread.

[0003] Existing dual-energy water heaters typically focus on improving user experience by heating water quickly and providing hot water for extended periods. However, when heating water via circuitry, dual-energy water heaters are prone to overheating because they cannot monitor the entire water tank, only the average temperature. This uneven heating can cause some areas of the tank to overheat. Additionally, the increased number of circuits can cause the electronic hardware, especially the main control board, to overheat, especially if the water heater itself is not waterproof. Summary of the Invention

[0004] This invention provides an overheating and circuit protection system for a dual-energy water heater. This system addresses the common problem of overheating in dual-energy water heaters when heating water via circuitry. The issue arises because the system cannot monitor the entire water tank, only the average temperature. This means that certain areas of the tank may be excessively hot due to uneven heating. Furthermore, the increased number of circuits can cause the electronic hardware, particularly the main control board, to overheat, especially if the water heater's high humidity level is compromised by poor waterproofing.

[0005] This invention proposes an over-temperature and circuit protection system for a dual-energy water heater, comprising a dual-energy water heater, including:

[0006] Over-temperature sensing module: used to sense over-temperature of water circuit components and circuit devices of dual-energy water heater, acquire over-temperature sensing data, and determine whether there is over-temperature of water circuit or circuit based on the over-temperature sensing data;

[0007] Dual-energy control module: used to control the opening and closing of the gas switch and circuit switch of the dual-energy water heater based on over-temperature sensing data;

[0008] Circuit testing module: Used to periodically refresh the circuit of the dual-energy water heater and determine whether there are any abnormalities in the refreshed circuit when the circuit overheats;

[0009] Power management module: Used to control the gas supply volume of the gas circuit valve or the power supply voltage of the circuit power supply terminal based on the opening and closing control and operation abnormalities.

[0010] Furthermore, the over-temperature sensing module includes:

[0011] The over-temperature processing unit includes a jump comparator for receiving temperature data and determining whether the real-time temperature is over-temperature based on the real-time temperature jump point; wherein...

[0012] The switching comparators include: water temperature switching comparator and electrical temperature switching comparator;

[0013] The water circuit component temperature sensing unit includes two or more temperature sensing devices installed on the water circuit component of the dual-energy water heater. The temperature sensing devices are used to collect real-time temperature data of the water tank in the water circuit component and transmit the real-time temperature data to the over-temperature processing unit.

[0014] The circuit temperature sensing unit includes a temperature sensing circuit configured on the control board of the dual-energy water heater. This temperature sensing circuit comprises multiple reference circuits.

[0015] Each reference circuit corresponds to a temperature range.

[0016] Furthermore, the temperature sensing device includes:

[0017] Temperature probes are arranged in an array on the protective layer of the water tank of the water system component;

[0018] The temperature probe includes: a first temperature probe and a second temperature probe;

[0019] The electrical signal of the temperature probe is transmitted through the signal line on the first temperature probe, and the second temperature probe is connected in parallel to the signal line.

[0020] One end of the signal line is connected to the display unit used to display temperature data;

[0021] The protective layer is located on the outside of the temperature probe;

[0022] The protective layer is fixedly connected to the first temperature probe and the second temperature probe, respectively.

[0023] A thin film protective layer is provided on the outside of the protective layer;

[0024] The signal line is embedded in a ring, which is used to fit onto the conduit.

[0025] Furthermore, the temperature sensing circuit includes:

[0026] A current generating circuit is used to generate the reference current required by the temperature sensing circuit.

[0027] A temperature sensing circuit is used to generate a temperature-sensing output voltage that is linearly related to temperature under the action of a reference current.

[0028] A feedback loop connects the current generation circuit and the temperature sensing circuit to prevent mismatch between them.

[0029] The current generating circuit includes a first PMOS transistor, a first diode, a second NMOS transistor, a third NMOS transistor, a fourth PMOS transistor, a first transistor, and a second transistor;

[0030] The gate of the first PMOS transistor is used to receive a level signal, and the drain of the first PMOS transistor is connected to the drain of the fourth PMOS transistor through the first diode (D1).

[0031] The positive terminal of the first diode (D1) is connected to the gate of the second NMOS transistor; the drain of the second NMOS transistor is connected to the collector of the second transistor.

[0032] The source of the fourth PMOS transistor is connected to the collector of the first transistor;

[0033] The base of the first transistor is connected to the source of the second NMOS transistor, and the emitter of the first transistor is connected to the base of the second transistor.

[0034] The source output reference current of the fourth PMOS transistor.

[0035] Furthermore, the dual-energy control module includes:

[0036] Temperature data determination unit: used to acquire temperature data of the dual-energy water heater and compare the temperature data with the preset temperature. When the temperature data is greater than the preset temperature, a switch control signal is generated.

[0037] The switch control signal specifically includes: acquiring the gas circuit control information or circuit control information of the dual-energy water heater, and generating corresponding control commands based on the gas circuit control information or circuit control information;

[0038] Opening / closing control unit: receives control commands and controls the circuit or gas path of the dual-energy control module to close or close via the control commands.

[0039] Furthermore, the circuit testing module includes:

[0040] Refresh signal generation unit: used to generate one or more cycles of clock signals as periodic refresh signals on the main control board of the dual-energy water heater using a clock generator;

[0041] Delayed refresh unit: used to input clock signals of one or more cycles to the main control board, and the main control board outputs clock signals for each refresh cycle;

[0042] Counting unit: used to count the delayed clock signal using a counter on a dual-energy water heater; and

[0043] The counter's count result is compared with the clock signal input to the main control board to determine the comparison result; among which,

[0044] The comparison results include the number of cycles and cycle stability;

[0045] Based on the comparison results, determine whether the main control board of the dual-energy water heater is malfunctioning.

[0046] Furthermore, the power management module includes:

[0047] Command queue unit: Used to monitor opening and closing control events and abnormal operation events through the main control board of the dual-energy water heater, and push the event information of opening and closing control events and abnormal operation events as abnormal warning information to the command queue;

[0048] Control unit: Retrieves the corresponding control command from the command queue through the electrical supply device of the dual-energy water heater, and adjusts the gas valve or the voltage of the circuit power supply terminal based on the command queue; wherein,

[0049] Gas circuit valve regulation includes adjusting the opening and closing of the gas circuit shut-off valve and the flow rate regulation of the gas circuit flow valve in dual-energy water heaters.

[0050] The voltage regulation of the circuit power supply terminal includes the opening and closing regulation of the power supply switch of the dual-energy water heater and the voltage transformation regulation of the power supply.

[0051] Furthermore, the system also includes:

[0052] Rated control unit: Used to input a high-level voltage to the test terminal of the dual-energy water heater main control board, and control the dual-energy water heater main control board to enter the rated operating state;

[0053] Current limiting control unit: It is used to input the high-level voltage to the power supply terminal of the dual-energy water heater main control board after delay. When the dual-energy water heater main control board enters the short circuit state, it obtains the current signal when the dual-energy water heater main control board is short-circuited. If it is greater than the current limiting threshold, it controls the current regulator to work and controls the current of the dual-energy water heater main control board to be constant, so that the dual-energy water heater main control board enters the short-circuit current limiting state.

[0054] Shutdown control unit: If the current during a short circuit of the dual-energy water heater main control board exceeds the current limiting threshold, a current limiting control signal is issued. After a delay, this signal is combined with a high-level signal after the delay to generate a control signal, which controls the shutdown of the dual-energy water heater main control board, releases the short-circuit current limiting state of the dual-energy water heater main control board, and puts the dual-energy water heater main control board into the shutdown state.

[0055] Result Acquisition Unit: Used to acquire test results of the dual-energy water heater main control board when it enters the cooling period.

[0056] Furthermore, the system also includes:

[0057] Circuit temperature calculation module: used to calibrate the circuitry of the dual-energy water heater, calculate and store information representing temperature characteristics; among which,

[0058] Temperature characteristics include the thermal resistance and heat capacity of the circuit components in a dual-energy water heater;

[0059] Circuit testing module: used to obtain the current temperature and the current flowing through the circuit components of the dual-energy water heater by measurement;

[0060] Temperature change module: Used to estimate the temperature rise of the circuit components of the dual-energy water heater after a specific delay time from the current temperature measurement, based on the stored thermal resistance, heat capacity, and current.

[0061] Cooling control is performed based on the estimated temperature after the delay time, and calibration is carried out as the temperature rises.

[0062] Furthermore, the system also includes:

[0063] Gas circuit control module: used to execute gas circuit actions through the gas circuit components of the dual-energy water heater; among which,

[0064] Gas path operations include opening, closing, heating, and removing impurities;

[0065] Gas mixing control unit: used to precisely mix the gas and air in the dual-energy water heater according to a specified ratio; among which,

[0066] When the gas mixture ratio fluctuates beyond the preset value, the gas mixing ratio is detected, and the ratio is determined based on the fluctuation value. After the system alarms, the ratio is adjusted.

[0067] Gas circuit monitoring unit: Used to monitor the gas circuit pressure of the dual-energy water heater and to trigger a gas circuit alarm when the gas circuit pressure exceeds the preset value.

[0068] The beneficial effects of this invention are as follows:

[0069] This invention can detect the temperature of a dual-energy water heater and also test the circuit, thus achieving dual protection functions of over-temperature protection and circuit protection for the dual-energy water heater.

[0070] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0071] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0072] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0073] Figure 1 This is a system composition diagram of an over-temperature and circuit protection system for a dual-energy water heater according to an embodiment of the present invention;

[0074] Figure 2 This is a control principle diagram of the temperature sensing module in an embodiment of the present invention;

[0075] Figure 3 This is a circuit diagram of the current generation circuit in an embodiment of the present invention. Detailed Implementation

[0076] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0077] This invention proposes an over-temperature and circuit protection system for a dual-energy water heater, comprising a dual-energy water heater, including:

[0078] Over-temperature sensing module: used to sense over-temperature of water circuit components and circuit devices of dual-energy water heater, acquire over-temperature sensing data, and determine whether there is over-temperature of water circuit or circuit based on the over-temperature sensing data;

[0079] Dual-energy control module: used to control the opening and closing of the gas switch and circuit switch of the dual-energy water heater based on over-temperature sensing data;

[0080] Circuit testing module: Used to periodically refresh the circuit of the dual-energy water heater and determine whether there are any abnormalities in the refreshed circuit when the circuit overheats;

[0081] Power management module: Used to control the gas supply volume of the gas circuit valve or the power supply voltage of the circuit power supply terminal based on the opening and closing control and operation abnormalities.

[0082] The working principle of the above technical solution is as follows: (see attached) Figure 1As shown, the over-temperature sensing module of this invention senses the temperature of water circuit components in the dual-energy water heater, such as the water tank. Over-temperature in the gas circuit is mainly reflected in the temperature of the water tank. Circuit temperature monitoring primarily detects the temperature of different electronic components within the circuit. The dual-energy control module can control the switching on / off of the gas circuit or electrical circuit of the dual-energy water heater, thereby preventing dangerous accidents due to overheating. The circuit testing module can test the main control board of the dual-energy water heater to determine if there are any circuit abnormalities. The power management module can achieve temperature regulation by controlling the gas supply of the gas circuit valve of the dual-energy water heater to regulate the temperature during gas heating. Furthermore, the circuit power supply can be controlled by adjusting the voltage at the circuit power supply terminal to prevent overheating.

[0083] The beneficial effects of the above technical solution are as follows: the present invention can detect the temperature of the dual-energy water heater and also test the circuit, realizing the dual protection function of over-temperature protection and circuit protection of the dual-energy water heater.

[0084] Furthermore: the over-temperature sensing module includes:

[0085] The over-temperature processing unit includes a jump comparator for receiving temperature data and determining whether the real-time temperature is over-temperature based on the real-time temperature jump point; wherein...

[0086] The switching comparators include: water temperature switching comparator and electrical temperature switching comparator;

[0087] The water circuit component temperature sensing unit includes two or more temperature sensing devices installed on the water circuit component of the dual-energy water heater. The temperature sensing devices are used to collect real-time temperature data of the water tank in the water circuit component and transmit the real-time temperature data to the over-temperature processing unit.

[0088] The circuit temperature sensing unit includes a temperature sensing circuit configured on the control board of the dual-energy water heater. This temperature sensing circuit comprises multiple reference circuits.

[0089] Each reference circuit corresponds to a temperature range.

[0090] The principle behind the above technical solution is as follows:

[0091] As attached Figure 2 As shown, the temperature sensing module of this invention is based on a switching comparator. That is, the voltage value corresponding to the reference temperature of the switching comparator is compared with the voltage value corresponding to the real-time temperature, thereby performing temperature processing. The water circuit component mainly performs real-time acquisition of temperature data and temperature sensing. The temperature sensing of the circuit is based on multiple reference circuits. Temperature sensing is performed through the reference circuits. Since each reference circuit corresponds to a temperature range, the accuracy of temperature can be guaranteed when adjusting the temperature.

[0092] The beneficial effects of the above technical solution are as follows:

[0093] First, by employing a jump comparator, this invention ensures instantaneous temperature changes in the water heater. Compared to current temperature detection methods that rely on a processor to calculate the temperature readings and then control the heating to stop, this approach is safer. This is because processor-based methods are susceptible to failure if the temperature sensor malfunctions, preventing the processor from stopping the heating. Furthermore, the use of multiple reference circuits and multiple temperature ranges, compared to existing methods that rely on direct temperature sensing for fixed-temperature heating, makes this invention safer, reduces temperature fluctuations, and increases stability.

[0094] Furthermore: the temperature sensing device includes:

[0095] Temperature probes are arranged in an array on the protective layer of the water tank of the water system component;

[0096] The temperature probe includes: a first temperature probe and a second temperature probe;

[0097] The electrical signal of the temperature probe is transmitted through the signal line connected to the first temperature probe, and the second temperature probe is connected in parallel to the signal line.

[0098] One end of the signal line is connected to the display unit used to display temperature data;

[0099] The protective layer is located on the outside of the temperature probe;

[0100] The protective layer is fixedly connected to the first temperature probe and the second temperature probe, respectively.

[0101] A thin film protective layer is provided on the outside of the protective layer;

[0102] The signal line is embedded in a ring, which is used to fit onto the conduit.

[0103] The principle behind the above technical solution is as follows:

[0104] In this invention, when the water tank is sensing temperature, the temperature sensing device is a temperature probe. Through the temperature probe and signal line, the entire water tank is comprehensively monitored to achieve comprehensive temperature detection.

[0105] The beneficial effects of the above technical solution are as follows:

[0106] The parallel connection of the two temperature probes in this invention constitutes dual-channel temperature measurement, resulting in more accurate temperature detection. The protective layer prevents corrosion and also prevents water vapor from causing detection deviations in the internal circuitry of the temperature probes. The signal line has a loop and a conduit to prevent electrical signal deviations and instability.

[0107] Furthermore: the temperature sensing circuit includes:

[0108] A current generating circuit is used to generate the reference current required by the temperature sensing circuit.

[0109] A temperature sensing circuit is used to generate a temperature-sensing output voltage that is linearly related to temperature under the action of a reference current.

[0110] A feedback loop connects the current generation circuit and the temperature sensing circuit to prevent mismatch between them.

[0111] The current generating circuit includes a first PMOS transistor Q1, a first diode D1, a second NMOS transistor Q2, a third NMOS transistor Q3, a fourth PMOS transistor (Q4), a first transistor Q5, and a second transistor Q6;

[0112] The gate of the first PMOS transistor Q1 is connected to the power supply VCC, and the drain of the first PMOS transistor Q1 is connected to the drain of the fourth PMOS transistor Q4 through the first diode D1.

[0113] The positive terminal of the first diode D1 is connected to the gate of the second NMOS transistor Q2; the drain of the second NMOS transistor Q2 is connected to the collector of the second transistor Q6.

[0114] The source of the fourth PMOS transistor Q4 is connected to the collector of the first transistor Q5;

[0115] The base of the first transistor Q5 is connected to the source of the second NMOS transistor Q2, and the emitter of the first transistor Q5 is connected to the base of the second transistor Q6.

[0116] The source output reference current of the fourth PMOS transistor Q4.

[0117] The principle behind the above technical solution is as follows:

[0118] The current generating circuit of this invention is used to generate a reference current. In the prior art, the reference current cannot be adjusted, resulting in the reference comparison parameter remaining unchanged during temperature detection. This invention uses a compensated reference current generating circuit composed of multiple transistors. (See attached diagram) Figure 3As shown, in this process, if the first PMOS transistor Q1 receives a high-level signal, the first PMOS transistor Q1 turns on, and the second NMOS transistor Q2, the third NMOS transistor Q3, the fourth PMOS transistor Q4, the first transistor Q5, and the second transistor Q6 turn on in succession. Then, the reference current can be adjusted by adjusting the conduction state of the second NMOS transistor Q2 and the third NMOS transistor Q3. When the first PMOS transistor Q1 receives a low-level signal, the third NMOS transistor Q3 and the fourth PMOS transistor Q4 turn on, and a fixed reference current is output.

[0119] The temperature sensing circuit is used to output a temperature sensing voltage by comparing the current with a reference current through a linear relationship. The feedback loop is to ensure that when the current signal generated by the temperature sensing circuit is compared with the reference current, the suppression signal in the circuit will affect the comparison process and cause inaccurate comparison values. The function of the feedback loop is to convert the current generated by the temperature sensing circuit back to the current generated by the current for comparison.

[0120] The beneficial effects of the above technical solution are as follows:

[0121] This invention enables the comparison of reference currents and the measurement of temperature. Furthermore, when setting the reference current, this invention can adjust different reference currents to address situations where the existing reference current cannot be adjusted. This invention can control the reference current and provide real-time feedback on the comparison results.

[0122] Furthermore: the dual-energy control module includes:

[0123] Temperature data determination unit: used to acquire temperature data of the dual-energy water heater and compare the temperature data with the preset temperature. When the temperature data is greater than the preset temperature, a switch control signal is generated.

[0124] The switch control signal specifically includes: acquiring the gas circuit control information or circuit control information of the dual-energy water heater, and generating corresponding control commands based on the gas circuit control information or circuit control information;

[0125] Opening / closing control unit: receives control commands and controls the circuit or gas path of the dual-energy control module to close or close via the control commands.

[0126] The principle behind the above technical solution is as follows:

[0127] This invention can detect and compare temperatures. By pre-setting the comparison temperature, a switch control signal is generated through the temperature feedback signal to control the gas circuit or circuit of the dual-energy water heater to be shut off.

[0128] The beneficial effects of the above technical solution are as follows:

[0129] This invention achieves over-temperature control of a dual-energy water heater by comparing temperature data with a preset temperature; and achieves the closing and opening of the circuit and gas circuit by using dual control signals for both the gas and electrical circuits.

[0130] Furthermore: the circuit testing module includes:

[0131] Refresh signal generation unit: used to generate one or more cycles of clock signals as periodic refresh signals on the main control board of the dual-energy water heater using a clock generator.

[0132] Delayed refresh unit: used to input clock signals of one or more cycles to the main control board, and the main control board outputs clock signals for each refresh cycle;

[0133] Counting unit: used to count the delayed clock signal using a counter on a dual-energy water heater; and

[0134] The counter's count result is compared with the clock signal input to the main control board to determine the comparison result; among which,

[0135] The comparison results include the number of cycles and cycle stability;

[0136] Based on the comparison results, determine whether the main control board of the dual-energy water heater is malfunctioning.

[0137] The principle behind the above technical solution is as follows:

[0138] This invention incorporates a refresh signal. Within each pulse cycle, a corresponding clock signal is used for counting. This counting process calculates a curve showing the circuit state of the dual-energy water heater within each cycle, allowing for the determination of whether the main control circuit is functioning correctly. The clock generator is a pulse generator that counts based on time. By periodically refreshing the pulse signal and comparing it with the counter's count, the main control board is monitored. Because the clock signal refreshes periodically, the main control circuit is also periodically assessed to determine if it is operating normally.

[0139] In the implementation of this invention, the pulse generator first generates a pulse sequence during counting:

[0140] The pulse sequence is as follows:

[0141] in, Indicates in A pulse sequence at a given time; Indicates the power of the pulse generator; )express The pulse sequence is recorded at time 1. The parameter values ​​of each sequence parameter; Indicates the initial timing; Represents the Gaussian impulse function; express A rectangular function that records the unit amplitude of the pulse sequence at all times; belong ; This represents the total number of parameter values ​​in the pulse sequence.

[0142] Based on the pulse sequence, calculate the signal sequence of the clock signal on the main control board:

[0143]

[0144] in, This indicates the delay time of the clock signal received by the main control board; Indicate The clock signal received by the main control board at the moment Sequence parameters of a signal sequence;

[0145] The sequence of the pulse generator and the sequence of the clock signal of the main control board are periodically compared to determine whether the counting results of the pulse counter within a detection cycle are consistent.

[0146] The beneficial effects of this invention are as follows:

[0147] The main control board of this invention can perform periodic automatic detection to determine whether there is any abnormality in the main control board, so it can also quickly detect abnormal operation of the dual-energy water heater, thereby enabling safety monitoring of the water heater.

[0148] Furthermore: the power management module includes:

[0149] Command queue unit: Used to monitor opening and closing control events and abnormal operation events through the main control board of the dual-energy water heater, and push the event information of opening and closing control events and abnormal operation events as abnormal warning information to the command queue;

[0150] Control unit: Retrieves the corresponding control command from the command queue through the electrical supply device of the dual-energy water heater, and adjusts the gas valve or the voltage of the circuit power supply terminal based on the command queue; wherein,

[0151] Gas circuit valve regulation includes adjusting the opening and closing of the gas circuit shut-off valve and the flow rate regulation of the gas circuit flow valve in dual-energy water heaters.

[0152] The voltage regulation of the circuit power supply terminal includes the opening and closing regulation of the power supply switch of the dual-energy water heater and the voltage transformation regulation of the power supply.

[0153] The principle behind the above technical solution is as follows:

[0154] In terms of power management, this invention monitors the overall operating status of the water heater through the main control board, determines whether there are any abnormal events based on the operating status, and then generates corresponding control commands based on the abnormal events, and adjusts the gas flow rate, current and voltage based on the control commands.

[0155] The beneficial effects of the above technical solution are as follows:

[0156] Opening / closing control events refer to the opening and closing events of the main control board, i.e., power-off events. Operational anomaly events indicate abnormal phenomena occurring during the operation of the main control board. These anomalies are pushed to the command queue. Each control command in the command queue is then processed by the control unit to adjust the airflow, including opening and closing, as well as flow rate. It can also control the opening and closing of circuits, and regulate voltage. Voltage regulation can also control temperature.

[0157] Furthermore, the system also includes:

[0158] Rated control unit: Used to input a high-level voltage to the test terminal of the dual-energy water heater main control board, and control the dual-energy water heater main control board to enter the rated operating state;

[0159] Current limiting control unit: It is used to input the high-level voltage to the power supply terminal of the dual-energy water heater main control board after delay, control the dual-energy water heater main control board to enter the short circuit state, obtain the current signal when the dual-energy water heater main control board is short-circuited, and if it is greater than the current limiting threshold, it controls the current regulator to work and controls the current of the dual-energy water heater main control board to be constant, so that the dual-energy water heater main control board enters the short circuit current limiting state;

[0160] Shutdown control unit: If the current during a short circuit of the dual-energy water heater main control board exceeds the current limiting threshold, a current limiting control signal is issued. After a delay, this signal is combined with a high-level signal after the delay to generate a control signal, which controls the shutdown of the dual-energy water heater main control board, releases the short-circuit current limiting state of the dual-energy water heater main control board, and puts the dual-energy water heater main control board into the shutdown state.

[0161] Result Acquisition Unit: Used to acquire test results of the dual-energy water heater main control board when it enters the cooling period.

[0162] The principle behind the above technical solution is as follows:

[0163] The dual-energy water heater of this invention has a rated control unit. The earpiece control unit drives the dual-energy water heater through the level signal of the main control board to achieve rated operation control. The current limiting control unit can realize delayed control to prevent short circuits in the dual-energy water heater under direct operation, which would cause damage to the dual-energy water heater. Through signal delay and the control capability of the current regulator, the dual-energy water heater will not be damaged under short-circuit current limiting conditions. When entering the current limiting state, the pipe section control unit can control the dual-energy water heater to release the current limiting state and shut down the equipment through the current limiting control signal. Then, the abnormal information of the dual-energy water heater's main control is determined through testing.

[0164] Furthermore, the system also includes:

[0165] Circuit temperature calculation module: used to calibrate the circuitry of the dual-energy water heater, calculate and store information representing temperature characteristics; among which,

[0166] Temperature characteristics include the thermal resistance and heat capacity of the circuit components in a dual-energy water heater;

[0167] Circuit testing module: used to obtain the current temperature and the current flowing through the circuit components of the dual-energy water heater by measurement;

[0168] Temperature variation module: Used to estimate the temperature rise of the circuit components of the dual-energy water heater after a specific delay time from the current temperature measurement, based on stored thermal resistance, heat capacity, and current.

[0169] Cooling control is performed based on the estimated temperature after a delay time, with calibration occurring during temperature rise.

[0170] The principle behind the above technical solution is as follows:

[0171] This invention can calibrate the circuit device of a dual-energy water heater, determine its temperature characteristics, test the thermal resistance and heat capacity of the dual-energy water heater during different electronic periods based on the temperature characteristics, analyze the overall temperature rise of the circuit, and thus achieve temperature calibration.

[0172] The beneficial effects of the above technical solution are as follows:

[0173] This invention enables precise circuitry control of dual-energy water heaters, enhances and calculates temperature characteristics, and achieves more refined temperature control.

[0174] This invention can perform temperature calibration during the temperature rise process.

[0175] Furthermore, the system also includes:

[0176] Gas circuit control module: used to execute gas circuit actions through the gas circuit components of the dual-energy water heater; among which,

[0177] Gas path operations include opening, closing, heating, and removing impurities;

[0178] Gas mixing control unit: used to precisely mix the gas and air in the dual-energy water heater according to a specified ratio; among which,

[0179] When the gas mixture ratio fluctuates beyond the preset value, the gas mixing ratio is detected, and the ratio is determined based on the fluctuation value. After the system alarms, the ratio is adjusted.

[0180] Gas circuit monitoring unit: Used to monitor the gas circuit pressure of the dual-energy water heater and to trigger a gas circuit alarm when the gas circuit pressure exceeds the preset value.

[0181] The working principle of the above technical solution is as follows:

[0182] In terms of gas circuit control, this invention controls the gas circuit to perform different actions such as opening, closing, heating, and purging impurities. Through these actions, the gas and air are blended in an appropriate ratio, thereby increasing the combustion efficiency of the dual-energy water heater.

[0183] The beneficial effects of the above technical solution are as follows:

[0184] When performing dual-energy control, if gas is used for heating, gas and air need to be mixed. In order to enhance heating efficiency and save energy, this invention detects the mixing ratio of gas and air, detects the fluctuation value after mixing, and adjusts the mixing ratio of air and gas according to the fluctuation value to achieve better combustion and improve combustion efficiency.

[0185] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A dual energy water heater over-temperature and circuit protection system, comprising a dual energy water heater, characterized in that, The application relates to a double-energy water heater, which comprises the following modules: An over-temperature sensing module for sensing over-temperature of waterway components and circuit devices of the double-energy water heater, obtaining over-temperature sensing data, and judging whether waterway over-temperature or circuit over-temperature exists based on the over-temperature sensing data; A double-energy control module for controlling opening and closing of a gas switch and a circuit switch of the double-energy water heater according to the over-temperature sensing data; A circuit test module for periodically refreshing the circuit of the double-energy water heater and judging whether the refreshed circuit has operation abnormity when the circuit over-temperature exists; A power supply control module for controlling gas supply amount of a gas valve or power supply voltage of a power supply end of the double-energy water heater according to the opening and closing control and the operation abnormity. The over-temperature sensing module comprises: A current generating circuit for generating a reference current required by a temperature sensing circuit; A temperature sensing circuit for generating a temperature sensing output voltage in linear relation with temperature under the action of the reference current; A feedback loop connected with the current generating circuit and the temperature sensing circuit to avoid mismatching between the current generating circuit and the temperature sensing circuit, wherein The current generating circuit comprises a first PMOS transistor (Q1), a first diode (D1), a second NMOS transistor (Q2), a third NMOS transistor (Q3), a fourth PMOS transistor (Q4), a first triode (Q5) and a second triode (Q6); A gate of the first PMOS transistor (Q1) is used for receiving a level signal, and a drain of the first PMOS transistor (Q1) is connected with a drain of the fourth PMOS transistor (Q4) through the first diode (D1); A positive electrode of the first diode (D1) is connected with a gate of the second NMOS transistor (Q2), and a drain of the second NMOS transistor (Q2) is connected with a collector of the second triode (Q6); A source of the fourth PMOS transistor (Q4) is connected with a collector of the first triode (Q5); A base of the first triode (Q5) is connected with a source of the second NMOS transistor (Q2), and an emitter of the first triode (Q5) is connected with a base of the second triode (Q6); The source of the fourth PMOS transistor (Q4) outputs the reference current.

2. A dual energy water heater over-temperature and circuit protection system as recited in claim 1, wherein, The over-temperature sensing module comprises: An over-temperature processing unit comprising a jump comparator for receiving temperature data and determining whether real-time temperature is over-temperature according to a real-time temperature jump point; wherein The jump comparator comprises a water temperature jump comparator and an electric temperature jump comparator; A waterway component temperature sensing unit comprising two or more temperature sensing devices arranged on waterway components of the double-energy water heater, the temperature sensing devices being used for collecting real-time temperature data of a water tank in the waterway components and transmitting the real-time temperature data to the over-temperature processing unit; An electric circuit temperature sensing unit comprising a temperature sensing circuit arranged on a control mainboard of the double-energy water heater, the temperature sensing circuit comprising a plurality of reference circuits; wherein Each reference circuit corresponds to a temperature interval.

3. A dual energy water heater over-temperature and circuit protection system as recited in claim 2, wherein, The temperature sensing device comprises: Temperature probes arranged in an array on a protective layer of the water tank of the waterway components; The temperature probes comprise first temperature probes and second temperature probes. The electric signal of the temperature probe is transmitted through a signal line on the first temperature probe, and the second temperature probe is connected in parallel on the signal line; One end of the signal line is connected to a display unit for displaying temperature data; The protective layer is located outside the temperature probe; The protective layer is fixed to the first temperature probe and the second temperature probe, respectively; The protective layer is provided with a thin film protective layer outside; The signal line is embedded in a ring sleeve for sleeving on the catheter.

4. A dual energy water heater over-temperature and circuit protection system as recited in claim 1, wherein, The dual-energy control module comprises: The temperature data determination unit is used to obtain the temperature data of the dual-energy water heater, and compare the temperature data with the preset temperature, and generate a switch control signal when the temperature data is greater than the preset temperature; The switch control signal specifically comprises: obtaining the gas path control information or the circuit control information of the dual-energy water heater, and generating a corresponding control instruction according to the gas path control information or the circuit control information; The opening and closing control unit obtains the control instruction and controls the circuit of the dual-energy control module to be closed or the gas path to be closed through the control instruction.

5. A dual energy water heater over-temperature and circuit protection system as recited in claim 1, wherein, The circuit test module comprises: The refresh signal generation unit is used to generate one or more cycles of clock signals as periodic refresh signals on the main control board of the dual-energy water heater by using a clock generator; The delay refresh unit is used to input the one or more cycles of clock signals to the main control board, and the main control board outputs the clock signal of each refresh cycle; The counting unit is used to count the delayed clock signal by using a counter on the dual-energy water heater; and The counting result of the counter is compared with the clock signal input to the main control board to determine a comparison result; wherein The comparison result includes the number of cycles and the cycle stability; According to the comparison result, it is judged whether the main control board of the dual-energy water heater is running abnormally.

6. A dual energy water heater over-temperature and circuit protection system as recited in claim 1, wherein, The power supply control module comprises: The instruction queue unit is used to monitor the opening and closing control events and the running abnormal events through the main control board of the dual-energy water heater, and push the event information of the opening and closing control events and the running abnormal events as abnormal early warning information into the instruction queue; The control unit takes out the corresponding control instruction from the instruction queue through the electrical supply device of the dual-energy water heater, and adjusts the gas path valve or adjusts the voltage of the circuit power supply end based on the instruction queue; wherein The gas path valve adjustment includes the opening and closing adjustment of the gas path stop valve and the flow adjustment of the gas path flow valve of the dual-energy water heater The circuit power supply end voltage adjustment includes the opening and closing adjustment of the power supply switch and the voltage transformation adjustment of the power supply voltage of the dual-energy water heater.

7. A dual energy water heater over-temperature and circuit protection system as recited in claim 1, wherein, The system further comprises: The rated control unit is used to input a high-level voltage to the test end of the main control board of the dual-energy water heater, and control the main control board of the dual-energy water heater to enter a rated running state; The current signal of the main control board of the dual-energy water heater when short-circuiting is obtained, and if it is greater than the current limiting threshold, the current regulator is controlled to work, the current of the main control board of the dual-energy water heater is controlled to be constant, and the main control board of the dual-energy water heater is controlled to enter a short-circuit current limiting state. The shutdown control unit: if the current of the double-energy water heater main control board short circuit is greater than the current limit threshold, a current limit control signal is sent out, and after a delay, a high-level signal is combined to generate a control signal to control the shutdown of the double-energy water heater main control board, the double-energy water heater main control board short circuit current limit state is released, and the double-energy water heater main control board enters the shutdown state. The result collection unit: used to obtain the test results of the double-energy water heater main control board when the double-energy water heater main control board enters the cooling period.

8. A dual energy water heater over-temperature and circuit protection system as recited in claim 1, wherein, The system further comprises: The circuit temperature calculation module: used to calibrate the circuit device of the double-energy water heater, calculate and store information representing temperature characteristics; wherein, The temperature characteristics include the thermal resistance and heat capacity of the circuit components of the double-energy water heater; The circuit test module: used to obtain the current temperature and the current flowing through the circuit components of the double-energy water heater by measurement; The temperature change module: used to estimate the temperature rise of the circuit components of the double-energy water heater after a delay time from the current temperature measurement based on the thermal resistance and heat capacity of the circuit components and the current; Based on the estimated temperature after the delay time, cooling control is performed, and calibration processing is performed in the temperature rise.

9. A dual energy water heater over-temperature and circuit protection system as recited in claim 1, wherein, The system further comprises: The gas path control module: used to execute gas path actions through the gas path components of the double-energy water heater; wherein, The gas path actions include opening, closing, heating, and removing impurities; The gas mixing control unit: used to accurately mix the fuel gas and air of the double-energy water heater according to the specified proportion; wherein, When the mixed gas ratio fluctuation is greater than the preset value, the gas mixing ratio is detected, and according to the fluctuation value, the ratio value is determined, and after the system alarm, the ratio is adjusted; The gas path monitoring unit: used to monitor the gas path pressure of the double-energy water heater, and when the gas path pressure exceeds the preset value, the gas path alarm is performed.

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