Gas water heater controller

Abstract

The utility model discloses a gas water heater controller, and relates to the technical field of control circuits. The system comprises a main control chip, a power supply circuit, an ignition feedback circuit, a valve control circuit, a data interaction circuit and a fan operation circuit, the fan operation circuit is electrically connected with the power supply circuit and the main control chip, and the fan operation circuit controls the operation power of a fan in real time according to the smoke size after receiving a driving signal of the main control chip; the fan operation circuit comprises a fan high-speed operation circuit and a fan low-speed operation circuit, the fan high-speed operation circuit is used for controlling high-speed operation of the fan, the fan low-speed operation circuit is used for controlling low-speed operation of the fan, and the fan high-speed operation circuit further comprises a fan high-speed control circuit and a fan high-speed driving circuit. By the adoption of the technical scheme, the combustion efficiency and adaptability are remarkably improved, the combustion process is optimized, energy waste is reduced, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, in particular to a gas water heater controller. Background Art

[0002] In traditional gas water heater controllers, the main components include the main control chip, power supply circuit, and the ignition and valve control circuits that match them. The core function of these systems is to ensure that the gas water heater operates under safe conditions, and to control the gas supply, ignition, and flame stability through electronic control components. The main control chip is responsible for receiving sensor data and adjusting the operating state of the water heater based on these inputs to achieve the temperature and flow requirements set by the user.

[0003] However, the fans in these traditional systems can often only provide constant power output and cannot adjust the fan speed according to real-time combustion conditions. This results in the flexibility of the system in dealing with different combustion environments (such as wind speed changes, different smoke exhaust efficiency, etc.). Since the fan output is not adjusted based on the real-time flue gas size and quality, it will lead to energy waste and affect the performance and safety of the equipment. Utility Model Content

[0004] The purpose of the utility model is to address the defects and shortcomings of the prior art. On the one hand, a gas water heater controller is provided, comprising:

[0005] Main control chip;

[0006] A power supply circuit, used to supply power to the entire gas water heater controller;

[0007] An ignition feedback circuit, electrically connected to the power supply circuit and the main control chip, for ignition and detecting whether the flame is burning;

[0008] A valve control circuit, electrically connected to the power supply circuit and the main control chip;

[0009] A data interaction circuit, wherein the data interaction circuit is used to perform data interaction with the main control chip;

[0010] The fan operation circuit is electrically connected to the power supply circuit and the main control chip, and after receiving the driving signal from the main control chip, controls the operation power of the fan in real time according to the size of the smoke;

[0011] The fan operation circuit also includes a fan high-speed operation circuit and a fan low-speed operation circuit. The fan high-speed operation circuit is used to control the fan high-speed operation, and the fan low-speed operation circuit is used to control the fan low-speed operation.

[0012] The fan high-speed operation circuit also includes a fan high-speed control circuit and a fan high-speed drive circuit;

[0013] The fan high-speed control circuit includes a transistor Q1, a diode D17, a resistor R18 and a resistor R26, the anode of the diode D17 is connected to the power circuit, the cathode of the diode D17 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the control signal input terminal through the resistor R18, and the resistor R26 is connected between the collector of the transistor Q1 and the control signal output terminal;

[0014] The fan high-speed drive circuit includes a relay KJ3, and the relay KJ3 includes a coil port 1, a coil port 2, a normally open contact 3 and a normally open contact 4, wherein the coil port 1 is connected to the fan high-speed control circuit, the coil port 2 is connected to the power supply circuit, the normally open contact 3 is connected to the power supply circuit, and the normally open contact 4 is connected to the HIGHT port of the main control chip when the contact is closed. When the coil is energized, the normally open contact is closed from port 3 to port 4.

[0015] The fan low-speed operation circuit also includes a fan low-speed control circuit and a fan low-speed drive circuit;

[0016] The fan low-speed control circuit includes a transistor Q4, a diode D18, a resistor R19 and a resistor R20, the anode of the diode D18 is connected to the power circuit, the cathode is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, and the base is connected to the control signal input terminal through the resistor R19, and the resistor R20 is connected between the collector of the transistor Q4 and the control signal output terminal.

[0017] The fan low-speed drive circuit includes relay KJ2, and the relay KJ3 includes coil port 5, coil port 6, normally open contact 7 and normally open contact 8, wherein the coil port 1 is connected to the fan low-speed control circuit, the coil port 2 is connected to the power supply circuit, the normally open contact 3 is connected to the power supply circuit, and the normally open contact 4 is connected to the HIGHT port of the main control chip when the contact is closed. When the coil is energized, the normally open contact is closed from port 3 to port 4.

[0018] The valve control circuit also includes a switch valve control circuit, which includes a filter capacitor E7, a resistor R60, a resistor R61, a resistor R62, a diode D19, a diode D22, a diode D23, a field effect transistor M2 and a capacitor C23. The gate of the field effect transistor M2 is connected to the resistor R62, the resistor R62 is connected to the resistor R60, the resistor R61 and the diode D19, the resistor R60 is connected to one end of the filter capacitor E7, the in-phase input end of the main control chip is connected to the other end of the filter capacitor E7, the drain of the field effect transistor M2 is connected to the diode D22, the diode D23 and the capacitor C23, the source of the field effect transistor M2, the other end of the diode D19, the other end of the diode D22, the other end of the resistor R61 and the other end of the capacitor C23 are grounded, and the other end of the diode D22 is connected to the power supply circuit.

[0019] The valve control circuit also includes a proportional valve control circuit, and the proportional valve control circuit includes an opening circuit and a closing circuit;

[0020] The start-up circuit includes: a transistor Q5, a transistor Q6, a resistor R35, a resistor R36, a resistor R44, a resistor R49, a resistor R50, a diode D1 and a diode D15, the base of the transistor Q5 is connected to the diode D1, the resistor R35 and the resistor R36, the in-phase input terminal of the main control chip is connected to the other end of the resistor R35, the collector of the transistor Q5 is connected to one end of the resistor R44, the other end of the resistor R44 is connected to the resistor R49 and the base of the transistor Q6, the emitter of the transistor Q6, the other end of the resistor R50 and the other end of the resistor R49 are respectively connected to the circuit power supply, the collector of the transistor Q6 is connected to the diode D15 and the resistor R50, the other end of the resistor R36, the emitter of the transistor Q5, the diode D1 and the other end of the diode D15 are grounded;

[0021] The shutdown circuit includes: a resistor R40, a resistor R41, a resistor R48, a capacitor C13, a capacitor C24, and a diode D10. One end of the resistor R40 is connected to the diode D10 and the capacitor C13, and the other end is connected to the resistor R41 and the capacitor C24. The other end of the resistor R41 is connected to the resistor R48. The in-phase input end of the main control chip is connected to the connection point of the resistor R40, the capacitor C13 and the diode D10. The other ends of the capacitor C13 and the capacitor C24 are grounded, and the other end of the resistor R48 is grounded.

[0022] The valve control circuit also includes a first sectional valve control circuit, which includes a field effect transistor M3, a diode D20, a diode D21, a resistor R21, a resistor R25 and a capacitor C16. The in-phase input terminal of the main control chip is connected to one end of the resistor R25, the other end of the resistor R25 is connected to the resistor R21 and the gate of the field effect transistor M3, the drain of the field effect transistor M3 is connected to the diode D20, the diode D21 and the capacitor C16, the other end of the diode D20 is connected to the power supply circuit, and the resistor R21, the source of the field effect transistor M3, the diode D21 and the other end of the capacitor C16 are grounded respectively.

[0023] The valve control circuit also includes a second sectional valve control circuit, which includes a field effect transistor M1, a diode D2, a diode D3, a resistor R14, a resistor R15 and a capacitor C14. The in-phase input terminal of the main control chip is connected to one end of the resistor R14, and the other end is connected to the resistor 15 and the gate of the field effect transistor M1. The drain of the field effect transistor M1 is connected to the diode D2, the diode D3 and the capacitor C14. The other end of the diode D2 is connected to the power supply circuit. The resistor R15, the source of the field effect transistor M1, the diode D3 and the other end of the capacitor C14 are grounded respectively.

[0024] The ignition feedback circuit includes an ignition circuit.

[0025] The ignition circuit includes a transistor Q2, a transistor Q3, a resistor R30, a resistor R31, a resistor R32, a resistor R43, a capacitor C11, a capacitor C18, a capacitor C21, a transformer coil T2, a transformer coil T4, a diode D11, a diode D13, an ignition line P1 and an ignition line P2. The ignition signal of the main control chip is connected to one end of the resistor R30, the other end of R30 is connected to the base of the transistor Q3 and the capacitor C21, the other end of the capacitor C21 is grounded, the emitter of the transistor Q3 is grounded, and the collector is connected to the resistor R31 and the base of the transistor Q2. The other end of the resistor R31 is also grounded. The emitter is connected to the power supply circuit through the capacitor C11, the collector is connected to the primary side of the transformer T2, the resistor R32 is connected between the collector of the transistor Q3 and the primary side of the transformer T2, the secondary side of the transformer T2 is connected to one end of the diode D11, the other end of the diode D11 is connected to the diode D13, the resistor R43 and the capacitor C18, one end of the voltage zener diode D13 is grounded, the other end is connected to the resistor R43, and the resistor R43 is connected to the other end of the capacitor C18, the primary side of the transformer T4 is connected to the connection point of the capacitor C18 and the resistor R43, and the secondary side of T4 is connected to the ignition line P1 and the ignition line P2;

[0026] The ignition feedback circuit also includes a combustion feedback circuit;

[0027] The combustion feedback circuit includes a resistor R33, a resistor R37, a resistor R38, a resistor R39, a resistor R42, a resistor R46, a capacitor C12, a capacitor C15, a capacitor C17, a flame sensing interface CN7 and a patch switch diode D14, one end of the resistor R38 is grounded, and the other end is connected to the 1 pin of the flame sensing interface CN7, the capacitor C12 is connected to the resistor R33, the resistor R33 is connected to the secondary side of the transformer T2, the 2 pins of the flame sensing interface CN7 are connected to the resistor R37, the other end of the resistor R37 is connected to the capacitor C12 and the resistor R39, the other end of the resistor R39 is connected to the resistor R42 and the capacitor C17, the other end of the resistor R42 is connected to the resistor R46 and the anode of the patch switch diode D14, the resistor R46 is connected to the power supply circuit, and the cathode of the patch switch diode D14 is grounded. One end of the capacitor C15 is grounded.

[0028] On the other hand, the present invention also provides a gas water heater, including a gas water heater controller according to the above technical solution.

[0029] The embodiment of the utility model significantly improves the combustion efficiency and adaptability, optimizes the combustion process, reduces energy waste and improves safety by introducing the fan operation circuit;

[0030] The fan with high-speed and low-speed operation options ensures that the optimal operating efficiency can be maintained in various environments, effectively improving the performance and environmental adaptability of the overall water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 paying creative labor.

[0032] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;

[0033] Figure 2 This is a circuit diagram of the interface between the water outlet probe and the water inlet probe of another embodiment of the utility model;

[0034] Figure 3 This is a switch valve control circuit diagram of another embodiment of the utility model;

[0035] Figure 4 This is a first sectional valve control circuit diagram of another embodiment of the utility model;

[0036] Figure 5 This is a second sectional valve control circuit diagram of another embodiment of the utility model;

[0037] Figure 6 It is an opening circuit of a proportional valve of another embodiment of the utility model;

[0038] Figure 7 It is a closing circuit of a proportional valve of another embodiment of the utility model;

[0039] Figure 8 It is a fan high-speed control circuit and a fan low-speed control circuit of another embodiment of the utility model;

[0040] Fig. 9 A high-speed fan driving circuit and a low-speed fan driving circuit of another embodiment of the utility model;

[0041] Fig.10 It is a schematic diagram of an auxiliary component circuit of another embodiment of the utility model;

[0042] Fig.11 This is a circuit diagram of a CN6 port of another embodiment of the utility model;

[0043] Fig.12 This is another embodiment of the CN3 port display interface circuit diagram of the utility model

[0044] Fig.13 This is a schematic diagram of the main control chip port of another embodiment of the utility model;

[0045] Fig.14 This is an ignition feedback circuit diagram of another embodiment of the utility model;

[0046] Fig.15 It is a power supply circuit diagram of another embodiment of the utility model;

[0047] Fig.16 It is a structural schematic diagram of another embodiment of the utility model. DETAILED DESCRIPTION

[0048] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0049] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0050] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Reference Figure 1-Figure 16 , a gas water heater controller is proposed:

[0053] A gas water heater controller, characterized by comprising:

[0054] Main control chip 1;

[0055] Power supply circuit 2, used to supply power to the entire gas water heater controller;

[0056] An ignition feedback circuit 4 is electrically connected to the power supply circuit 2 and the main control chip 1 and is used for ignition and detecting whether the flame is burning;

[0057] A valve control circuit 5, electrically connected to the power supply circuit 2 and the main control chip 1;

[0058] A data interaction circuit 6, wherein the data interaction circuit 6 is used to perform data interaction with the main control chip 1;

[0059] The fan operation circuit 3 is electrically connected to the power supply circuit 2 and the main control chip 1, and controls the operation power of the fan in real time according to the size of the smoke after receiving the driving signal from the main control chip 1;

[0060] The fan operation circuit 3 also includes a fan high-speed operation circuit and a fan low-speed operation circuit. The fan high-speed operation circuit is used to control the fan to operate at high speed, and the fan low-speed operation circuit is used to control the fan to operate at low speed.

[0061] The embodiment of the utility model significantly improves the combustion efficiency and adaptability, optimizes the combustion process, reduces energy waste and improves safety by introducing the fan operation circuit;

[0062] The fan with high-speed and low-speed operation options ensures that the optimal operating efficiency can be maintained in various environments, effectively improving the performance and environmental adaptability of the overall water heater.

[0063] Among them, refer to Fig.15 , the signal flow in the power supply circuit is as follows: 220V AC enters the system through connector CN1, then, fuse F1 is responsible for overload protection, inductor L1 is used to filter noise and electromagnetic interference, AC signal is converted into DC signal after bridge rectifier DB1, and then preliminary filtering is performed through electrolytic capacitor E1 to smooth voltage fluctuations. After further filtering by R22, R23 and C22, the DC voltage is supplied to integrated circuit IC1 (OB2365CP), IC1 provides voltage conversion control signal, generates isolation voltage through transformer T1 secondary, filtered by rectifier diodes D4, D5 and electrolytic capacitor E2, and then the high voltage generated by L1 and R5 is provided to diodes D7 and D6 to generate a stable 24V output, and another set of voltage regulator diodes and filter capacitors (D9, E3, E4, E6) generate 5V output for use in other circuits.

[0064] As a preferred solution but not a limitation, two fans of different powers can be used: a low-speed fan and a high-speed fan, which are installed on different branches of the exhaust duct respectively. The low-speed fan is located in the first branch of the exhaust duct and has the characteristics of high efficiency and low noise. The high-speed fan is located in the second branch of the exhaust duct and is used to quickly exhaust smoke in a high-load environment.

[0065] As a preferred solution but not a limitation, the fan high-speed operation circuit also includes a fan high-speed control circuit and a fan high-speed drive circuit;

[0066] Reference Figure 8 The fan high-speed control circuit comprises a transistor Q1, a diode D17, a resistor R18 and a resistor R26, wherein the anode of the diode D17 is connected to the power circuit (2), the cathode of the diode D17 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the control signal input terminal through the resistor R18, and the resistor R26 is connected between the collector of the transistor Q1 and the control signal output terminal;

[0067] Reference Fig. 9 The fan high-speed drive circuit includes a relay KJ3, and the relay KJ3 includes a coil port 1, a coil port 2, a normally open contact 3 and a normally open contact 4, wherein the coil port 1 is connected to the fan high-speed control circuit, the coil port 2 is connected to the power supply circuit (2), the normally open contact 3 is connected to the power supply circuit (2), and the normally open contact 4 is connected to the HIGHT port of the main control chip (1) when the contact is closed. When the coil is energized, the normally open contact is closed from port 3 to port 4.

[0068] As a preferred solution but not a limitation, the fan low-speed operation circuit further includes a fan low-speed control circuit and a fan low-speed drive circuit;

[0069] Reference Figure 8 The fan low speed control circuit comprises a transistor Q4, a diode D18, a resistor R19 and a resistor R20, wherein the anode of the diode D18 is connected to the power circuit (2), the cathode is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base is connected to the control signal input terminal through the resistor R19, and the resistor R20 is connected between the collector of the transistor Q4 and the control signal output terminal.

[0070] Reference Fig. 9 The fan low-speed drive circuit includes a relay KJ2, and the relay KJ3 includes a coil port 5, a coil port 6, a normally open contact 7 and a normally open contact 8, wherein the coil port 1 is connected to the fan low-speed control circuit, the coil port 2 is connected to the power supply circuit (2), the normally open contact 3 is connected to the power supply circuit (2), and the normally open contact 4 is connected to the HIGHT port of the main control chip (1) when the contact is closed. When the coil is energized, the normally open contact closes from port 3 to port 4.

[0071] Since the principles of the two fan control circuits are the same, only the high-wind fan control circuit is taken as an example. After the high-wind control signal sent from the central control chip enters the circuit, it first passes through the voltage regulator diode D17. The diode D17 ensures that the signal voltage is maintained below the safety threshold to prevent potential damage to downstream components due to overvoltage. The stabilized signal is led to the base of transistor Q1, and the voltage activates the transistor to turn on, allowing current to flow from the collector to the emitter. The base is grounded through resistor R18 to form a bias network, and resistor R26 is located between the emitter and the output end Gaofeng-1. The two work together to set the operating point of the transistor and the range of current amplification. Subsequently, the conduction state of transistor Q1 determines the voltage and current at the output end of Gaofeng-1, thereby driving the fan to work and completing the emission control of combustion exhaust gas.

[0072] Since the two fan drive circuits have the same principle, only the high wind drive control circuit is used as an example. High wind-1 is used as the input signal to first activate the coil of the KJ3 relay. The two ends of the relay coil are connected to the 220V line and the 24V power supply respectively. When the high wind-1 signal activates KJ3, the relay contacts are closed from the normally open position and connected to the HIGHT terminal. In this way, the closed contacts allow 220VL to pass and output to the HIGHT terminal, providing the necessary drive voltage for the fan. The HIGHT terminal then transmits this drive voltage to the fan to complete the fan start-up and drive process.

[0073] This embodiment realizes precise regulation of the fan power and efficient operation, and uses high and low speed control and drive circuits composed of transistors, resistors and relays, so that the fan can adjust its speed according to the real-time working requirements of the water heater, optimize combustion efficiency and exhaust emissions. This dynamic adjustment function not only improves the energy utilization efficiency, but also enhances the environmental adaptability of the equipment and the safety of users, and also ensures the stability and reliability of the gas water heater under various conditions.

[0074] refer to Fig. 9 As a preferred solution but not a limitation, a fan drive interface can also be added, which is used to connect and control the fan in the gas water heater, adjust the air intake according to the combustion demand, ensure sufficient oxygen in the combustion chamber, thereby improving thermal efficiency and reducing harmful gases produced by incomplete combustion;

[0075] refer to Fig. 9 As a preferred solution rather than a limitation, a wind pressure detection interface can also be added to monitor the wind pressure conditions in the gas water heater, which is mainly responsible for evaluating the pressure status inside the combustion chamber and the exhaust system to ensure the efficiency and safety of the combustion and exhaust processes.

[0076] refer to Fig.10 As a preferred solution but not a limitation, an auxiliary component circuit can be added, which is used to connect and control multiple sensors and control interfaces in the gas water heater, wherein the resistors, capacitors and connection points in the circuit ensure the stable output of voltage and current, thereby improving the control accuracy and system response speed, etc.; through these auxiliary components, the control system of the water heater can more accurately monitor and adjust internal parameters, such as temperature and pressure, to ensure the stable operation of the water heater under different working conditions, thereby improving the thermal efficiency and safety of the system.

[0077] refer to Fig.11 As a preferred solution but not a limitation, a CN6 port circuit can be added. The circuit is used to connect and control the key control unit in the gas water heater. Through the multi-functional interface of the CN6 port, integrated control of various sensors and actuators of the gas water heater can be achieved to ensure the best oxygen and gas mixture ratio in the combustion chamber, thereby improving thermal efficiency and reducing the emission of harmful gases.

[0078] refer to Fig.12 As a preferred solution but not a limitation, a CN3 port display interface circuit can be added. The circuit is used to connect and control the display in the gas water heater. Through the signal conversion function of the CN3 port, accurate transmission of data from the control unit to the display can be achieved, ensuring that the user interface displays real-time and accurate operation information and system status.

[0079] As a preferred solution but not a limitation, the valve control circuit 5 also includes a switch valve control circuit, referring to Figure 3 , the switch valve control circuit includes a filter capacitor E7, a resistor R60, a resistor R61, a resistor R62, a diode D19, a diode D22, a diode D23, a field effect transistor M2 and a capacitor C23, the gate of the field effect transistor M2 is connected to the resistor R62, the resistor R62 is connected to the resistor R60, the resistor R61 and the diode D19, the resistor R60 is connected to one end of the filter capacitor E7, the in-phase input end of the main control chip 1 is connected to the other end of the filter capacitor E7, the drain of the field effect transistor M2 is connected to the diode D22, the diode D23 and the capacitor C23, the source of the field effect transistor M2, the other end of the diode D19, the other end of the diode D22, the other end of the resistor R61 and the other end of the capacitor C23 are grounded, and the other end of the diode D22 is connected to the power supply circuit 2;

[0080] Signal flow of the switch valve control circuit: The switch valve control signal is provided by the central control chip and input into the circuit, and undergoes a series of adjustment processes before entering the main switch circuit. The initial signal first passes through the E7 parallel capacitor for power supply decoupling and filtering to ensure stable DC power supply input. At the same time, the voltage regulator diode D19 limits the signal voltage to its stable value to prevent voltage spikes from damaging downstream components. The signal then passes through the resistor R60 current limiting resistor, which is used to prevent excessive current from flowing. The signal passes through the resistor R61 and resistor R62 voltage divider network, which are used to adjust to the voltage level required by the gate of MOSFET M2. M2 controls the current from the source to the drain through its gate voltage, thereby controlling the signal output at the switch valve-1 end. The C23 capacitor is connected in parallel to the gate to provide high-frequency decoupling. The D22 and D23 diodes are used to provide reverse voltage protection for M2. Finally, the switch valve-1 output provides a control signal to complete the adjustment of the switch valve.

[0081] Reference Figure 2 , this embodiment can also be implemented as follows Figure 2 The water outlet probe and water inlet probe shown are used to monitor the water inlet and outlet temperatures of the water heater. This configuration enables the control panel of the gas water heater to obtain water temperature data in real time, thereby accurately controlling the working state of the burner to adapt to different heating needs. By adjusting the firepower of the burner, it can be ensured that the water heater can provide a stable and constant water outlet temperature under different usage conditions.

[0082] As a preferred solution but not a limitation, the valve control circuit 5 also includes a proportional valve control circuit. Figure 6-Figure 7 , the proportional valve control circuit includes an opening circuit and a closing circuit;

[0083] The start-up circuit includes: a transistor Q5, a transistor Q6, a resistor R35, a resistor R36, a resistor R44, a resistor R49, a resistor R50, a diode D1 and a diode D15, the base of the transistor Q5 is connected to the diode D1, the resistor R35 and the resistor R36, the in-phase input terminal of the main control chip 1 is connected to the other end of the resistor R35, the collector of the transistor Q5 is connected to one end of the resistor R44, the other end of the resistor R44 is connected to the resistor R49 and the base of the transistor Q6, the emitter of the transistor Q6, the other end of the resistor R50 and the other end of the resistor R49 are respectively connected to the circuit power supply, the collector of the transistor Q6 is connected to the diode D15 and the resistor R50, the other end of the resistor R36, the emitter of the transistor Q5, the diode D1 and the other end of the diode D15 are grounded;

[0084] The shutdown circuit includes: a resistor R40, a resistor R41, a resistor R48, a capacitor C13, a capacitor C24, and a diode D10, wherein one end of the resistor R40 is connected to the diode D10 and the capacitor C13, and the other end is connected to the resistor R41 and the capacitor C24, and the other end of the resistor R41 is connected to the resistor R48, the in-phase input end of the main control chip 1 is connected to the connection point of the resistor R40, the capacitor C13 and the diode D10, the other ends of the capacitor C13 and the capacitor C24 are grounded, and the other end of the resistor R48 is grounded;

[0085] Signal flow of proportional valve opening circuit: BLF-PWM is used as the signal input terminal, firstly passes through the current limiting resistor R35, which limits the current of the input signal to protect the circuit, and then the signal passes through the resistor R36 and the series-connected diode D1. The resistor R36 and the diode D1 not only provide the necessary voltage drop for the base-emitter junction, but also ensure the unidirectional conduction of the signal, avoiding possible reverse current damage. After that, the PWM signal is input to the base of the transistor Q5, and the collector of the transistor Q5 is connected to the base of the transistor Q6 through the resistor R44, wherein the resistor R49 provides the base bias voltage for Q6, the resistor R50 is used to set the emitter current, the diode D15 is connected to the emitter of Q6 and BLF+, and the diode D15 is used to prevent the reverse current generated when the proportional valve is closed from breaking down the transistor, and finally the BLF+ signal is output to control the opening of the proportional valve;

[0086] Signal flow of proportional valve closing circuit: JS-AD signal first passes through voltage stabilizing diode D10, which provides stabilized voltage and overvoltage protection for the subsequent circuit. Parallel filter capacitor C13 is used to suppress high-frequency noise and optimize power quality. Then the signal passes through current limiting resistor R40, which limits the signal current to reduce noise and prevent circuit overload. The signal continues to pass through coupling capacitor C24, which allows AC signal components to pass while blocking DC components to achieve signal coupling. After that, resistor R41 further fine-tunes the signal strength. Finally, the signal is modulated by R41 and formed at the BLF- terminal to control the closing action of the solenoid valve.

[0087] As a preferred solution but not a limitation, refer to Figure 4 , the valve control circuit 5 also includes a first segmented valve control circuit, which includes a field effect transistor M3, a diode D20, a diode D21, a resistor R21, a resistor R25 and a capacitor C16, the in-phase input end of the main control chip 1 is connected to one end of the resistor R25, the other end of the resistor R25 is connected to the resistor R21 and the gate of the field effect transistor M3, the drain of the field effect transistor M3 is connected to the diode D20, the diode D21 and the capacitor C16, the other end of the diode D20 is connected to the power supply circuit 2, the resistor R21, the source of the field effect transistor M3, the diode D21 and the other end of the capacitor C16 are grounded respectively;

[0088] As a preferred solution but not a limitation, refer to Figure 5 , the valve control circuit 5 also includes a second segmented valve control circuit, which includes a field effect transistor M1, a diode D2, a diode D3, a resistor R14, a resistor R15 and a capacitor C14, the in-phase input end of the main control chip 1 is connected to one end of the resistor R14, and the other end is connected to the resistor 15 and the gate of the field effect transistor M1, the drain of the field effect transistor M1 is connected to the diode D2, the diode D3 and the capacitor C14, the other end of the diode D2 is connected to the power supply circuit 2, and the resistor R15, the source of the field effect transistor M1, the diode D3 and the other end of the capacitor C14 are grounded respectively;

[0089] Since the two segmented valve control circuits have the same principle, only the second segmented valve control circuit is used as an example. After the segmented valve 2 control signal generated by the central control chip enters the circuit, it first passes through resistor R14. Resistor R14 is used to achieve preliminary limitation of the signal current. Then it flows through resistor R15 and together with resistor R14 forms a voltage divider to adjust to the voltage level required by the gate of MOSFET M1. Diodes D2 and D3 are respectively located between the 24VFA power supply and M1 and between M1 and GND, acting as reverse voltage protection to protect the MOSFET from voltage spikes. Capacitor C14 is connected in parallel to M1 and GND to provide high-frequency decoupling for the gate. Finally, the control signal is output at the segmented valve -2 end to control the segmented valve.

[0090] As a preferred solution but not a limitation, refer to Fig.14 , the ignition feedback circuit 4 includes an ignition circuit;

[0091] The ignition circuit includes a transistor Q2, a transistor Q3, a resistor R30, a resistor R31, a resistor R32, a resistor R43, a capacitor C11, a capacitor C18, a capacitor C21, a transformer coil T2, a transformer coil T4, a diode D11, a diode D13, an ignition line P1 and an ignition line P2. The ignition signal of the main control chip 1 is connected to one end of the resistor R30, the other end of R30 is connected to the base of the transistor Q3 and the capacitor C21, the other end of the capacitor C21 is grounded, the emitter of the transistor Q3 is grounded, and the collector is connected to the resistor R31 and the base of the transistor Q2. The other end of the resistor R31 is also grounded. The emitter is connected to the power supply circuit 2 through the capacitor C11, the collector is connected to the primary side of the transformer T2, the resistor R32 is connected between the collector of the transistor Q3 and the primary side of the transformer T2, the secondary side of the transformer T2 is connected to one end of the diode D11, the other end of the diode D11 is connected to the diode D13, the resistor R43 and the capacitor C18, one end of the voltage zener diode D13 is grounded, the other end is connected to the resistor R43, and the resistor R43 is connected to the other end of the capacitor C18, the primary side of the transformer T4 is connected to the connection point of the capacitor C18 and the resistor R43, and the secondary side of T4 is connected to the ignition line P1 and the ignition line P2;

[0092] Ignition signal path: The ignition signal is first regulated by resistor R30, and then passes through transistor Q3, whose base is biased by R30 to ensure that the transistor is in the on state. The conduction of transistor Q3 allows current to pass through its collector and emitter, and then flow through the primary coil of transformer T2. The secondary coil of transformer T2 then generates a high voltage and transmits it to the ignition wires P1 and P2;

[0093] As a preferred solution but not a limitation, refer to Fig.14 , the ignition feedback circuit 4 also includes a combustion feedback circuit;

[0094] The combustion feedback circuit includes a resistor R33, a resistor R37, a resistor R38, a resistor R39, a resistor R42, a resistor R46, a capacitor C12, a capacitor C15, a capacitor C17, a flame sensing interface CN7 and a patch switch diode D14, one end of the resistor R38 is grounded, and the other end is connected to the 1 pin of the flame sensing interface CN7, the capacitor C12 is connected to the resistor R33, the resistor R33 is connected to the secondary side of the transformer T2, the 2 pins of the flame sensing interface CN7 are connected to the resistor R37, the other end of the resistor R37 is connected to the capacitor C12 and the resistor R39, the other end of the resistor R39 is connected to the resistor R42 and the capacitor C17, the other end of the resistor R42 is connected to the resistor R46 and the anode of the patch switch diode D14, the resistor R46 is connected to the power supply circuit 2, and the cathode of the patch switch diode D14 is grounded. One end of the capacitor C15 is grounded.

[0095] Flame detection signal: The signal starts from the pin of the flame sensing interface CN7, first passes through the current limiting resistor R38, then passes through the capacitor C12 and the resistor R37, and then the signal reaches the resistor R42 through the resistor R39. Finally, the signal is guided to the ground through the chip switching diode D14 in parallel with the resistor R46, completing the feedback path of the signal.

[0096] The above is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A gas water heater controller, characterized in that: include: Main control chip; A power supply circuit, used to supply power to the entire gas water heater controller; An ignition feedback circuit, electrically connected to the power supply circuit and the main control chip, for ignition and detecting whether the flame is burning; A valve control circuit, electrically connected to the power supply circuit and the main control chip; A data interaction circuit, wherein the data interaction circuit is used to perform data interaction with the main control chip; The fan operation circuit is electrically connected to the power supply circuit and the main control chip, and after receiving the driving signal from the main control chip, controls the operation power of the fan in real time according to the size of the smoke; The fan operation circuit also includes a fan high-speed operation circuit and a fan low-speed operation circuit. The fan high-speed operation circuit is used to control the fan high-speed operation, and the fan low-speed operation circuit is used to control the fan low-speed operation.

2. A gas water heater controller according to claim 1, characterized in that: The fan high-speed operation circuit also includes a fan high-speed control circuit and a fan high-speed drive circuit; The fan high-speed control circuit includes a transistor Q1, a diode D17, a resistor R18 and a resistor R26, the anode of the diode D17 is connected to the power circuit, the cathode of the diode D17 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the control signal input terminal through the resistor R18, and the resistor R26 is connected between the collector of the transistor Q1 and the control signal output terminal; The fan high-speed drive circuit includes a relay KJ3, and the relay KJ3 includes a coil port 1, a coil port 2, a normally open contact 3 and a normally open contact 4, wherein the coil port 1 is connected to the fan high-speed control circuit, the coil port 2 is connected to the power supply circuit, the normally open contact 3 is connected to the power supply circuit, and the normally open contact 4 is connected to the HIGHT port of the main control chip when the contact is closed. When the coil is energized, the normally open contact is closed from port 3 to port 4.

3. A gas water heater controller according to claim 1, characterized in that: The fan low-speed operation circuit also includes a fan low-speed control circuit and a fan low-speed drive circuit; The fan low speed control circuit includes a transistor Q4, a diode D18, a resistor R19 and a resistor R20, the anode of the diode D18 is connected to the power circuit, the cathode is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base is connected to the control signal input terminal through the resistor R19, and the resistor R20 is connected between the collector of the transistor Q4 and the control signal output terminal; The fan low-speed drive circuit includes relay KJ2, and the relay KJ3 includes coil port 5, coil port 6, normally open contact 7 and normally open contact 8, wherein the coil port 1 is connected to the fan low-speed control circuit, the coil port 2 is connected to the power supply circuit, the normally open contact 3 is connected to the power supply circuit, and the normally open contact 4 is connected to the HIGHT port of the main control chip when the contact is closed. When the coil is energized, the normally open contact is closed from port 3 to port 4.

4. A gas water heater controller according to claim 1, characterized in that: The valve control circuit also includes a switch valve control circuit, which includes a filter capacitor E7, a resistor R60, a resistor R61, a resistor R62, a diode D19, a diode D22, a diode D23, a field effect transistor M2 and a capacitor C23. The gate of the field effect transistor M2 is connected to the resistor R62, the resistor R62 is connected to the resistor R60, the resistor R61 and the diode D19, the resistor R60 is connected to one end of the filter capacitor E7, the in-phase input end of the main control chip is connected to the other end of the filter capacitor E7, the drain of the field effect transistor M2 is connected to the diode D22, the diode D23 and the capacitor C23, the source of the field effect transistor M2, the other end of the diode D19, the other end of the diode D22, the other end of the resistor R61 and the other end of the capacitor C23 are grounded, and the other end of the diode D22 is connected to the power supply circuit.

5. A gas water heater controller according to claim 1, characterized in that: The valve control circuit also includes a proportional valve control circuit, and the proportional valve control circuit includes an opening circuit and a closing circuit; The start-up circuit includes: a transistor Q5, a transistor Q6, a resistor R35, a resistor R36, a resistor R44, a resistor R49, a resistor R50, a diode D1 and a diode D15, the base of the transistor Q5 is connected to the diode D1, the resistor R35 and the resistor R36, the in-phase input terminal of the main control chip is connected to the other end of the resistor R35, the collector of the transistor Q5 is connected to one end of the resistor R44, the other end of the resistor R44 is connected to the resistor R49 and the base of the transistor Q6, the emitter of the transistor Q6, the other end of the resistor R50 and the other end of the resistor R49 are respectively connected to the circuit power supply, the collector of the transistor Q6 is connected to the diode D15 and the resistor R50, the other end of the resistor R36, the emitter of the transistor Q5, the diode D1 and the other end of the diode D15 are grounded; The shutdown circuit includes: a resistor R40, a resistor R41, a resistor R48, a capacitor C13, a capacitor C24, and a diode D10. One end of the resistor R40 is connected to the diode D10 and the capacitor C13, and the other end is connected to the resistor R41 and the capacitor C24. The other end of the resistor R41 is connected to the resistor R48. The in-phase input end of the main control chip is connected to the connection point of the resistor R40, the capacitor C13 and the diode D10. The other ends of the capacitor C13 and the capacitor C24 are grounded, and the other end of the resistor R48 is grounded.

6. A gas water heater controller according to claim 1, characterized in that: The valve control circuit also includes a first sectional valve control circuit, which includes a field effect transistor M3, a diode D20, a diode D21, a resistor R21, a resistor R25 and a capacitor C16. The in-phase input terminal of the main control chip is connected to one end of the resistor R25, the other end of the resistor R25 is connected to the resistor R21 and the gate of the field effect transistor M3, the drain of the field effect transistor M3 is connected to the diode D20, the diode D21 and the capacitor C16, the other end of the diode D20 is connected to the power supply circuit, and the resistor R21, the source of the field effect transistor M3, the diode D21 and the other end of the capacitor C16 are grounded respectively.

7. A gas water heater controller according to claim 1, characterized in that: The valve control circuit also includes a second sectional valve control circuit, which includes a field effect transistor M1, a diode D2, a diode D3, a resistor R14, a resistor R15 and a capacitor C14. The in-phase input terminal of the main control chip is connected to one end of the resistor R14, and the other end is connected to the resistor 15 and the gate of the field effect transistor M1. The drain of the field effect transistor M1 is connected to the diode D2, the diode D3 and the capacitor C14. The other end of the diode D2 is connected to the power supply circuit. The resistor R15, the source of the field effect transistor M1, the diode D3 and the other end of the capacitor C14 are grounded respectively.

8. A gas water heater controller according to claim 1, characterized in that: The ignition feedback circuit includes an ignition circuit; The ignition circuit includes a transistor Q2, a transistor Q3, a resistor R30, a resistor R31, a resistor R32, a resistor R43, a capacitor C11, a capacitor C18, a capacitor C21, a transformer coil T2, a transformer coil T4, a diode D11, a diode D13, an ignition line P1 and an ignition line P2. The ignition signal of the main control chip is connected to one end of the resistor R30, the other end of R30 is connected to the base of the transistor Q3 and the capacitor C21, the other end of the capacitor C21 is grounded, the emitter of the transistor Q3 is grounded, and the collector is connected to the resistor R31 and the base of the transistor Q2. The other end of the resistor R31 is also grounded. The emitter is connected to the power supply circuit through the capacitor C11, the collector is connected to the primary side of the transformer T2, the resistor R32 is connected between the collector of the transistor Q3 and the primary side of the transformer T2, the secondary side of the transformer T2 is connected to one end of the diode D11, the other end of the diode D11 is connected to the diode D13, the resistor R43 and the capacitor C18, one end of the voltage regulator diode D13 is grounded, and the other end is connected to the resistor R43, and the resistor R43 is connected to the other end of the capacitor C18, the primary side of the transformer T4 is connected to the connection point of the capacitor C18 and the resistor R43, and the secondary side of T4 is connected to the ignition line P1 and the ignition line P2.

9. A gas water heater controller according to claim 8, characterized in that: The ignition feedback circuit also includes a combustion feedback circuit; The combustion feedback circuit includes resistor R33, resistor R37, resistor R38, resistor R39, resistor R42, resistor R46, capacitor C12, capacitor C15, capacitor C17, flame sensing interface CN7 and chip switching diode D14, one end of the resistor R38 is grounded, and the other end is connected to pin 1 of the flame sensing interface CN7, the capacitor C12 is connected to resistor R33, the resistor R33 is connected to the secondary side of the transformer T2, pin 2 of the flame sensing interface CN7 is connected to resistor R37, the other end of the resistor R37 is connected to capacitor C12 and resistor R39, the other end of the resistor R39 is connected to resistor R42 and capacitor C17, the other end of the resistor R42 is connected to resistor R46 and the anode of the chip switching diode D14, the resistor R46 is connected to the power supply circuit, the cathode of the chip switching diode D14 is grounded, and one end of the capacitor C15 is grounded.

10. A gas water heater, characterized in that: It comprises a gas water heater controller as described in any one of claims 1 to 9.

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