Wall-hanging stove control circuit and wall-hanging stove

Abstract

A wall-hanging stove control circuit relates to the technical field of control circuits. The wall-hanging stove control circuit comprises a power supply circuit for supplying power to the wall-hanging stove control circuit, a main control chip, and a driving chip which is used for receiving a signal of the main control chip or sending a signal and is electrically connected with the main control chip and the power supply circuit, the ignition feedback circuit is used for igniting and detecting whether flames burn or not and is electrically connected with the power supply circuit and the main control chip, and the relay module circuit is electrically connected with the power supply circuit and the driving chip. According to the embodiment of the utility model, the driving chip is introduced, and the main control chip does not directly drive high-load equipment any more, so that the burden of the main control chip is remarkably reduced, and the endurance capability of the system to voltage spike and current overload is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, in particular to a wall-mounted boiler control circuit. Background Art

[0002] Traditional electric wall-mounted boiler systems mainly use electricity as energy and provide heating and hot water through electric heating elements such as heating tubes. They usually include a basic control unit for manually adjusting the temperature and other basic settings. Traditional controllers are also connected to an operation panel and display, allowing users to interact directly to adjust the set values. Standard electric wall-mounted boiler systems are also equipped with basic safety features such as overheating protection and leakage detection to ensure safe use.

[0003] However, in existing wall-mounted boiler technology, the main control chip is usually directly connected to various loads, such as heating elements, fans and water pumps. The main control chip that directly drives the load may be damaged when facing voltage spikes or current overloads due to the lack of effective isolation and protection measures, affecting the reliability and safety of the system. 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 wall-mounted boiler control circuit is provided, comprising:

[0005] Main control chip;

[0006] A driving chip, electrically connected to the main control chip and the power supply circuit, and used for receiving a signal from the main control chip or sending a signal;

[0007] A power supply circuit, used for supplying power to a wall-mounted boiler control circuit;

[0008] 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;

[0009] The relay module circuit is electrically connected to the power supply circuit and the driving chip.

[0010] The main control chip includes a water flow signal port, a water pressure port, an anti-dry burning port, a room temperature control port, a switch valve 1 port, a switch valve 2 port, a pressure port, a heating probe port, a bathroom probe port, a proportional valve AN port, an INT port, a wind pressure port, a flame sensing port, an ignition port, a three-way valve port, a TXD port, a RXD port, a water pump port, a fan 1 port, and a proportional valve port.

[0011] The ignition feedback circuit includes an ignition-1 port, an ignition module, an ignition relay and a flame detection module. The ignition-1 port is connected to the ignition relay, the ignition relay is connected to the ignition module, and the flame detection module is connected to the ignition module and the flame sensing port of the main control chip.

[0012] The ignition relay includes a normally open contact KJ8A and a normally closed contact KJ8B, the normally open contact KJ8A is connected to the ignition-1 port, and the normally closed contact KJ8B is connected to the live wire L.

[0013] The ignition module includes a transformer T2, diodes D9, D6, D5, resistors R50, R56, and a capacitor C9. The transformer T2 includes ports 1-4, wherein port 1 is connected to capacitor C9, the other end of capacitor C9 is connected to resistor R56, anode of diode D9, anode of diode D6, and anode of diode D5, the cathode of diode D5 is connected to the normally closed contact KJ8B of the ignition relay through resistor R50, and port 2, the other end of resistor R56, cathode of diode D9, and cathode of diode D6 are connected to the neutral line N.

[0014] The flame detection module includes resistors R57, R58, R59, R61, R62, R63, R64, R65, R66, R67, R68, R69, R70, R71, flame sensing line P2, diodes D11, D12, capacitors C10, C11, C12, C13, C14, transistors Q4, Q6, optocoupler isolation chip ISO2, and zinc oxygen varistor ZNR3, wherein resistors R57 and R58 are connected in the control circuit of ignition relays KJ8A and KJ8B for voltage division, resistor R59 is connected between the anode of diode D11 and the positive electrode of capacitor C10, resistor R61 is grounded through flame sensing line P2, and resistor R62 is connected between the output of optocoupler isolation chip ISO2 and capacitor C11. , resistor R63 is connected between the optocoupler ISO2 and the base of the transistor Q4, resistor R64 and resistor R67 are grounded from the other ends of the capacitors C12 and C13 respectively, resistor R65 and resistor R66 are connected to the collector of the transistor Q6, resistor R68 is connected from the capacitor C13 to the base of the transistor Q6, resistor R69 and capacitor C14 are connected between the base and emitter of the transistor Q6, resistors R70 and R71 are grounded through the zinc oxide varistor ZNR3, diodes D11 and D12 are connected between the capacitor C10 and the capacitor E5 for stabilizing the voltage, capacitors C10, C11, C12, C13 and C14 are used for filtering and decoupling, and are respectively connected to resistor R64, resistor R62, resistor R67, resistor R68 and resistor R69.

[0015] Transistors Q4 and Q6 are used for signal amplification, Q4 is connected to the output of optocoupler ISO2, and Q6 is connected to another part of the circuit for further signal processing.

[0016] The optocoupler isolation chip ISO2 is used for signal isolation of the circuit, receiving the signal from the resistor R62 and driving the transistor Q4.

[0017] The relay module circuit includes a 7-channel Darlington transistor array driver chip U1 of model ULN2003A, relay normally open contacts KJ1A, KJ2A, KJ3A, KJ4A, KJ5A, relay normally closed contacts KJ1B, KJ2B, KJ3B, KJ4B, KJ5B, diodes DZ2, D3, resistors R2, R24, R27, R39, R42, R43, R46, capacitors E7, E10, E39;

[0018] Among them, the GND end of the driving chip U1 is grounded, the COM port is connected to the power supply circuit, and the driving chip U1 also includes ports IN1-IN7 and OUT1-OUT7. Ports IN1-IN7 are relatively connected to ports OUT1-OUT7, port IN2 is connected to the ignition port of the main control chip, port IN3 is connected to the three-way valve port of the main control chip, port IN4 is connected to the water pump port of the main control chip, port IN5 is connected to the high wind port of the main control chip, port IN6 is connected to the switch valve 1 port of the main control chip, port IN7 is connected to the switch valve 2 port of the main control chip, port OUT7 is connected to the relay normally open contact KJ5A, port OUT6 is connected to the relay normally open contact KJ3A, port OUT5 is connected to the relay normally open contact KJ2A, port OUT4 is connected to the relay normally open contact KJ4A, port OUT3 is connected to the relay normally open contact KJ1A, and port OUT2 is connected to the ignition-1 port of the ignition feedback circuit.

[0019] It also includes a zero point detection circuit, which is located between the power supply circuit and the main control chip and is used to reduce electrical noise and electromagnetic interference during switching.

[0020] The zero point detection circuit includes resistors R23, R25, R34, R45, an optocoupler isolation chip IC4, and a diode D16. One end of the resistor R45 is connected to the INT port of the main control chip, and the other end of the resistor R45 is connected to the resistor R34 and the 4-port of the optocoupler isolation chip IC4. The 1-port of the optocoupler isolation chip IC4 is connected to the anode of the diode D16, the 2-port of the optocoupler isolation chip IC4 is connected to the cathode of the diode D16 and one end of the resistor R25. The other end of the resistor R25 is connected to the live wire through the resistor R23, and the 3-port of the optocoupler isolation chip IC4 is grounded.

[0021] On the other hand, the utility model also provides a wall-mounted boiler, including the wall-mounted boiler control circuit of the above technical solution.

[0022] By introducing a driver chip, the embodiment of the utility model no longer requires the main control chip to directly drive high-load equipment, which significantly reduces the burden on the main control chip and enhances the system's tolerance to voltage spikes and current overloads.

[0023] In addition, the use of relay modules further achieves electrical isolation, protecting the main control chip from the direct impact of high voltage and current, which not only improves the operational stability of the wall-mounted boiler, but also enhances its safety, ensuring the reliable operation of the equipment in various electrical environments, thereby extending the service life of the wall-mounted boiler and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 This is a structural block diagram of a wall-mounted boiler control circuit according to an embodiment of the utility model;

[0026] Figure 2 It is a structural diagram of other interfaces of the embodiment of the utility model;

[0027] Figure 3 It is a circuit diagram of the main control chip of the embodiment of the utility model;

[0028] Figure 4 It is a circuit diagram of the driving chip and relay module circuit of the embodiment of the utility model;

[0029] Figure 5 It is one of the circuit diagrams of other interfaces of the embodiment of the utility model;

[0030] Figure 6 It is a circuit diagram of the display interface of the embodiment of the utility model;

[0031] Figure 7 1 is a circuit diagram of a zero point detection circuit according to an embodiment of the utility model;

[0032] Figure 8 It is a circuit diagram of a fan speed regulating circuit according to an embodiment of the utility model;

[0033] Fig. 9 This is the second circuit diagram of other interfaces of the embodiment of the utility model;

[0034] Fig.10 This is the third circuit diagram of other interfaces of the embodiment of the utility model;

[0035] Fig.11 It is a circuit diagram of an ignition feedback circuit according to an embodiment of the utility model.

[0036] Reference numerals:

[0037] 1. Main control chip; 2. Driver chip; 3. Power supply circuit; 4. Ignition feedback circuit; 41. Ignition module; 42. Ignition relay; 43. Flame detection module; 5. Relay module circuit; 6. Zero point detection circuit. DETAILED DESCRIPTION

[0038] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Reference Figure 1-Figure 11 , a wall-mounted boiler control circuit is proposed, including:

[0043] Main control chip 1;

[0044] A driving chip 2, electrically connected to the main control chip 1 and the power supply circuit 3, and used for receiving signals from the main control chip 1 or sending signals;

[0045] The power supply circuit 3 is used to supply power to the wall-mounted boiler control circuit;

[0046] An ignition feedback circuit 4 is electrically connected to the power supply circuit 3 and the main control chip 1 and is used for ignition and detecting whether the flame is burning;

[0047] The relay module circuit 5 is electrically connected to the power supply circuit 3 and the driving chip 2 .

[0048] By introducing a driver chip, the embodiment of the utility model no longer requires the main control chip to directly drive high-load equipment, which significantly reduces the burden on the main control chip and enhances the system's tolerance to voltage spikes and current overloads.

[0049] In addition, the use of relay modules further achieves electrical isolation, protecting the main control chip from the direct impact of high voltage and current, which not only improves the operational stability of the wall-mounted boiler, but also enhances its safety, ensuring the reliable operation of the equipment in various electrical environments, thereby extending the service life of the wall-mounted boiler and reducing maintenance costs.

[0050] Specifically, this application is manufactured according to the following standards:

[0051] EN298;

[0052] GB6932-2001;

[0053] CJ / T228-2006.

[0054] Specifically, the electrical characteristics of this application are as follows:

[0055] Power supply 220 Vac ± 15%;

[0056] Voltage frequency 50Hz±5%;

[0057] Power 25VA;

[0058] Protection level 1P00;

[0059] The maximum allowable humidity is 90% @ 40°C;

[0060] Working temperature range: -10℃~70℃;

[0061] Storage temperature -20℃~80℃;

[0062] Fuse specification 3.15A fast-acting;

[0063] Pump output 220Vac 0.5A cosφ=0.8;

[0064] Fan output (thyristor speed regulation) 220Vac 0.5A cosφ=0.6;

[0065] Electric three-way valve 220Vac 0.5A cosφ=0.8;

[0066] Gas valve output 24Vdc0.5A cosφ=0.8;

[0067] Proportional valve output 220mA;

[0068] Insulation resistance is greater than DC500V / 10M;

[0069] Withstand voltage test 1350V / 5Ma, 60s;

[0070] Water pressure detection time 2s;

[0071] Wind pressure fault detection time <2s;

[0072] Overheat protection detection time <1s;

[0073] Temperature sensor fault detection time <1s.

[0074] Specifically, the combustion control parameters of this application are as follows:

[0075] Overheat protection disconnect lock;

[0076] Minimum ion current 0.5μA@220Vac;

[0077] Heating pre-cleaning time Tp 2S~10s;

[0078] Air pressure switch detection time 20s;

[0079] Safety time (ignition time) Ts 8±1s, 3 times;

[0080] Cleaning time after fan: 120s;

[0081] Post-pump circulation time Tpv 180s±5%;

[0082] Number of ignition attempts Ntl;

[0083] 3 times (within 1 hour), 20 minutes apart;

[0084] Spark frequency 10~18Hz;

[0085] Spark voltage>12KV on 30pF load;

[0086] Voltage polarityPower supply polarization None;

[0087] After no flame, the action repeats the ignition;

[0088] The automatic re-ignition time interval for ignition failure is 20 minutes (three times within 1 hour);

[0089] Number of ignition electrodes: Double electrode pair ignition;

[0090] Maximum EVG cable length 1m;

[0091] The maximum length of the ignition and probe is 1m.

[0092] Specifically, the basic performance parameters of this application are as follows:

[0093] Water tank water temperature sensor NTC 10KΩ±1%@25℃(β=3435);

[0094] Hot water temperature sensor NTC 10KΩ±1%@25℃(β=3435);

[0095] The water tank temperature setting range is 30℃~80℃;

[0096] Maximum operating temperature 95°C;

[0097] Water tank temperature turns off the boiler value. Water tank temperature ≥ water tank setting temperature;

[0098] Water tank temperature to open the boiler value (Ts-CH)℃;

[0099] The set temperature of sanitary water is 35℃~60℃;

[0100] The sanitary water temperature is ≥95℃ when the boiler is turned off and the heating water outlet temperature is ≥95℃;

[0101] The minimum water flow rate for sanitary water startup is 3L;

[0102] The minimum water flow rate for sanitary water shutdown is 2.5L;

[0103] Sanitary water safety shutdown time <1s;

[0104] The operating temperature of the secondary antifreeze pump is ≤5℃;

[0105] The stop temperature of the secondary antifreeze pump is ≥30℃;

[0106] Maximum antifreeze burning time 30 minutes;

[0107] Set temperature error ±1℃;

[0108] Post-pump circulation time 180s±5%;

[0109] To prevent frequent ignition interval, Tac 180s;

[0110] Main water flow switch confirmation time TVF 1s;

[0111] The maximum current of the proportional valve is 250mA (adjustable);

[0112] The minimum current of the proportional valve is 10mA (adjustable);

[0113] The proportional valve modulation current error is ±3mA.

[0114] The main control chip 1 includes a water flow signal port, a water pressure port, an anti-dry burning port, a room temperature control port, a switch valve 1 port, a switch valve 2 port, a pressure port, a heating probe port, a bathroom probe port, a proportional valve AN port, an INT port, a wind pressure port, a flame sensing port, an ignition port, a three-way valve port, a TXD port, a RXD port, a water pump port, a fan 1 port, and a proportional valve port.

[0115] Specifically, the CN1 wiring interface pin numbers are:

[0116] 1. DC220V switch valve (gas valve) -;

[0117] 2. DC220V sectional valve (gas valve) +;

[0118] 3. DC220V switch valve (gas valve) +;

[0119] CN2 wiring interface pin numbers are as follows:

[0120] 1. Three-way valve output N (common end);

[0121] 2. Empty;

[0122] 3. Three-way valve output L (normally open);

[0123] 4. Three-way valve output L (normally open);

[0124] The pin numbers of the CN4 wiring interface are as follows:

[0125] 1. ESC output three-wire N;

[0126] 2. Empty;

[0127] 3. ESC output three-wire L;

[0128] The CN5 wiring interface pin numbers are as follows:

[0129] 1. Communication interface +;

[0130] 2. Communication interface TXD;

[0131] 3. Communication interface RXD;

[0132] 4. Communication interface −

[0133] The pin numbers of the CN6 wiring interface are as follows:

[0134] 1. Water system output L;

[0135] 2. Empty;

[0136] 3. Water system output N;

[0137] 4. Fan output N (controllable output);

[0138] 5. Empty;

[0139] 6. Fan output L (controllable output);

[0140] 7. AC220V switch output (gas valve) L;

[0141] 8. Empty;

[0142] 9. AC220V switch output (gas valve) N;

[0143] The CN8 wiring interface pin numbers are as follows:

[0144] 1. +5V;

[0145] 2. Signal input;

[0146] 3. GND;

[0147] The pin numbers of the CN9 wiring interface are as follows:

[0148] 1. Water flow signal +5V;

[0149] 2. Water flow signal IN;

[0150] 3. Water flow signal GND;

[0151] 4. Air pressure switch;

[0152] 5. Wind pressure switch;

[0153] 6. Water pressure switch / water pressure sensor +5V;

[0154] 7. Water pressure switch / water pressure sensor IN;

[0155] 8. Anti-limit temperature control switch;

[0156] 9. Anti-limit temperature control switch;

[0157] The pin numbers of the CN10 wiring interface are as follows:

[0158] 1. Water pump control;

[0159] 2. Water pump control;

[0160] 3. Environmental protection control;

[0161] 4. Environmental protection control;

[0162] 5. Pressure pump control;

[0163] 6. Pressure pump control;

[0164] 7. Electric heating - (GND);

[0165] 8. Electric heating + (voltage 24V);

[0166] The ignition feedback circuit 4 includes an ignition-1 port, an ignition module 41, an ignition relay 42 and a flame detection module 43. The ignition-1 port is connected to the ignition relay 42, the ignition relay 42 is connected to the ignition module 41, and the flame detection module 43 is connected to the ignition module 41 and the flame sensing port of the main control chip 1.

[0167] The ignition feedback circuit in this embodiment achieves efficient and stable ignition control through a carefully designed connection method: the connection from the ignition-1 port to the ignition relay and then to the ignition module ensures reliable triggering of the circuit. At the same time, the addition of the flame detection module allows the system to monitor the flame status in real time, improving the safety and response speed of the system, thereby greatly enhancing the product's performance and the user's sense of security.

[0168] The ignition relay 42 includes a normally open contact KJ8A and a normally closed contact KJ8B. The normally open contact KJ8A is connected to the ignition-1 port, and the normally closed contact KJ8B is connected to the live line L.

[0169] The ignition relay design in this embodiment adopts a normally open contact KJ8A and a normally closed contact KJ8B, realizing flexible circuit connection and control: the connection of the normally open contact KJ8A enables rapid start-up when ignition is required, while the design of the normally closed contact KJ8B ensures stable power supply to the system in the non-ignition state.

[0170] The ignition module 41 includes a transformer T2, diodes D9, D6, D5, resistors R50, R56, and a capacitor C9. The transformer T2 includes ports 1-4, wherein port 1 is connected to capacitor C9, the other end of capacitor C9 is connected to resistor R56, anode of diode D9, anode of diode D6, and anode of diode D5, the cathode of diode D5 is connected to the normally closed contact KJ8B of ignition relay 42 through resistor R50, and port 2, the other end of resistor R56, cathode of diode D9, and cathode of diode D6 are connected to the neutral line N.

[0171] In this embodiment, port 1 of transformer T2 is connected to capacitor C9 and multiple resistors and diodes to form a complex control network, which ensures precise regulation of current and effective voltage stabilization. In addition, through the connection of port 2 to the neutral line N and the reasonable configuration of diodes and resistors, the electrical safety of the entire system is enhanced and the failure rate is reduced. Each component in the circuit cooperates precisely to improve the ignition efficiency and reliability, so that the entire ignition system responds quickly and is more suitable for high-demand application scenarios.

[0172] The flame detection module 43 includes resistors R57, R58, R59, R61, R62, R63, R64, R65, R66, R67, R68, R69, R70, R71, flame sensing line P2, diodes D11, D12, capacitors C10, C11, C12, C13, C14, transistors Q4, Q6, optocoupler isolation chip ISO2, zinc oxygen varistor ZNR3, wherein resistors R57 and R58 are connected in the control circuit of ignition relays 42KJ8A and KJ8B for voltage division, resistor R59 is connected between the anode of diode D11 and the positive electrode of capacitor C10, resistor R61 is grounded through flame sensing line P2, resistor R62 is connected between the output of optocoupler isolation chip ISO2 and capacitor C1 1, resistor R63 is connected between optocoupler ISO2 and the base of transistor Q4, resistor R64 and resistor R67 are grounded from the other ends of capacitor C12 and capacitor C13 respectively, resistor R65 and resistor R66 are connected to the collector of transistor Q6, resistor R68 is connected from capacitor C13 to the base of transistor Q6, resistor R69 and capacitor C14 are connected between the base and emitter of transistor Q6, resistors R70 and R71 are grounded through zinc oxide varistor ZNR3, diodes D11 and D12 are connected between capacitor C10 and capacitor E5 for stabilizing voltage, capacitors C10, C11, C12, C13 and C14 are used for filtering and decoupling, and are respectively connected to resistor R64, resistor R62, resistor R67, resistor R68 and resistor R69.

[0173] Transistors Q4 and Q6 are used for signal amplification, Q4 is connected to the output of optocoupler ISO2, and Q6 is connected to another part of the circuit for further signal processing.

[0174] The optocoupler isolation chip ISO2 is used for signal isolation of the circuit, receiving the signal from the resistor R62 and driving the transistor Q4.

[0175] In this embodiment, the flame detection module 43 has a highly complex and precise circuit design, which effectively improves the accuracy and reliability of flame detection: first, voltage division is performed in the control circuit of the ignition relay through resistors R57 and R58, which can stabilize the voltage in the circuit and improve the overall electrical safety. The connection between capacitors C10 to C14 and each resistor provides the necessary filtering and decoupling functions for the circuit, optimizes the signal quality and reduces noise, ensuring the clarity and accuracy of the detection signal.

[0176] The use of optocoupler isolation chip ISO2 and transistors Q4 and Q6 further enhances the functionality of the circuit. ISO2 provides the necessary signal isolation to protect the main control chip from electrical interference. At the same time, it drives transistor Q4 to amplify the signal and enhances the signal processing capability. Transistor Q6 further processes the signal during the signal amplification process and cooperates with zinc oxide varistor ZNR3 for voltage stabilization. This not only enhances the system's adaptability to environmental changes, but also improves the overall stability and response speed of the system.

[0177] The relay module circuit 5 includes a 7-channel Darlington transistor array driver chip 2U1 of model ULN2003A, relay normally open contacts KJ1A, KJ2A, KJ3A, KJ4A, KJ5A, relay normally closed contacts KJ1B, KJ2B, KJ3B, KJ4B, KJ5B, diodes DZ2, D3, resistors R2, R24, R27, R39, R42, R43, R46, capacitors E7, E10, E39;

[0178] Among them, the GND end of the driving chip 2U1 is grounded, the COM port is connected to the power supply circuit 3, and the driving chip 2U1 also includes ports IN1-IN7 and OUT1-OUT7. Ports IN1-IN7 are relatively connected to ports OUT1-OUT7, port IN2 is connected to the ignition port of the main control chip 1, port IN3 is connected to the three-way valve port of the main control chip 1, port IN4 is connected to the water pump port of the main control chip 1, port IN5 is connected to the high wind port of the main control chip 1, port IN6 is connected to the switch valve 1 port of the main control chip 1, port IN7 is connected to the switch valve 2 port of the main control chip 1, port OUT7 is connected to the relay normally open contact KJ5A, port OUT6 is connected to the relay normally open contact KJ3A, port OUT5 is connected to the relay normally open contact KJ2A, port OUT4 is connected to the relay normally open contact KJ4A, port OUT3 is connected to the relay normally open contact KJ1A, and port OUT2 is connected to the ignition-1 port of the ignition feedback circuit 4.

[0179] The relay module circuit in this embodiment provides powerful driving capability and high flexibility by adopting the ULN2003A driver chip. The ULN2003A includes a 7-channel Darlington transistor array, which can effectively drive multiple relay channels, so that the normally open contacts and normally closed contacts of the relay can be accurately controlled as needed.

[0180] Ports IN1 to IN7 of the driver chip are directly connected to different functional ports of the main control chip, such as the ignition port, three-way valve port, etc., so that the main control system can directly control the corresponding relay actions according to operational requirements, realize complex control logic and various operating modes, which not only optimizes the control process and reduces the response time of the system, but also enhances the scalability and modular design of the overall system.

[0181] In addition, the diodes and resistors in the circuit provide the necessary voltage and current protection, reduce circuit noise and electrical interference, and ensure the stable operation of the entire system. The addition of capacitors further stabilizes the power supply and ensures the continuity and reliability of the relay operation.

[0182] It also includes a zero point detection circuit 6, which is located between the power supply circuit 3 and the main control chip 1 and is used to reduce electrical noise and electromagnetic interference during switching.

[0183] In this embodiment, the zero point detection circuit 6 is located between the power supply circuit 3 and the main control chip 1. Its main function is to detect the zero point transition of the AC power supply at the moment of power switching, so as to perform switching operations at the lowest voltage point, significantly reducing the electrical noise and electromagnetic interference generated during switching, and improving the overall stability and reliability of the circuit.

[0184] In addition, by switching at the voltage zero point, the current surge in the circuit can be reduced, the service life of the circuit and its components can be extended, and the operating efficiency and safety of the equipment can be optimized.

[0185] The zero point detection circuit 6 includes resistors R23, R25, R34, R45, an optocoupler isolation chip IC4, and a diode D16. One end of the resistor R45 is connected to the INT port of the main control chip 1, and the other end of the resistor R45 is connected to the resistor R34 and the 4 port of the optocoupler isolation chip IC4. The 1 port of the optocoupler isolation chip IC4 is connected to the anode of the diode D16, the 2 port of the optocoupler isolation chip IC4 is connected to the cathode of the diode D16 and one end of the resistor R25. The other end of the resistor R25 is connected to the live wire through the resistor R23, and the 3 port of the optocoupler isolation chip IC4 is grounded.

[0186] The zero point detection circuit 6 in this embodiment realizes efficient signal processing and excellent electromagnetic compatibility through a carefully designed circuit connection relationship. The resistor R45 is connected to the INT port of the main control chip 1. This design allows the zero point detection signal to directly affect the interrupt port of the main control chip, so that the main control chip can respond to the zero point state of the grid voltage in real time, thereby accurately controlling the switching timing of related electrical equipment and reducing the switching current impact.

[0187] The optocoupler isolation chip IC4 plays a key role in this circuit. It not only provides signal isolation and protects the main control chip from high voltage, but also ensures the accuracy and reliability of signal transmission. The connection between diode D16 and the optocoupler isolation chip ensures that the AC voltage signal is properly rectified, further improving the accuracy of detection.

[0188] In addition, the configuration of resistors R23 and R25 not only provides appropriate voltage division and current limitation for the diode and the optocoupler isolation chip, but also helps stabilize the working state of the entire circuit, so that the zero-point detection circuit 6 can reduce electrical noise and electromagnetic interference while also improving the response speed of the entire system and the operational safety of electrical equipment. By precisely controlling the switching timing of the power supply and operating at the zero point of the grid voltage, the energy consumption and electrical loss of the system are significantly reduced.

[0189] 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 wall-mounted boiler control circuit, characterized in that: include: Main control chip (1); A power supply circuit (3), used to supply power to the wall-mounted boiler control circuit; A drive chip (2), electrically connected to the main control chip (1) and the power supply circuit (3), and used for receiving signals from the main control chip (1) or sending signals; An ignition feedback circuit (4) is electrically connected to the power supply circuit (3) and the main control chip (1) and is used for ignition and detecting whether the flame is burning; The relay module circuit (5) is electrically connected to the power supply circuit (3) and the drive chip (2).

2. A wall-mounted boiler control circuit according to claim 1, characterized in that: The main control chip (1) comprises a water flow signal port, a water pressure port, an anti-dry-burning port, a room temperature control port, a switch valve 1 port, a switch valve 2 port, a pressure port, a heating probe port, a bathroom probe port, a proportional valve AN port, an INT port, a wind pressure port, a flame sensing port, an ignition port, a three-way valve port, a TXD port, a RXD port, a water pump port, a fan 1 port, and a proportional valve port.

3. A wall-mounted boiler control circuit according to claim 2, characterized in that: The ignition feedback circuit (4) comprises an ignition-1 port, an ignition module (41), an ignition relay (42) and a flame detection module (43); the ignition-1 port is connected to the ignition relay (42), the ignition relay (42) is connected to the ignition module (41), and the flame detection module (43) is connected to the ignition module (41) and a flame sensing port of the main control chip (1).

4. A wall-mounted boiler control circuit according to claim 3, characterized in that: The ignition relay (42) comprises a normally open contact KJ8A and a normally closed contact KJ8B, the normally open contact KJ8A is connected to the ignition-1 port, and the normally closed contact KJ8B is connected to the live wire L.

5. A wall-mounted boiler control circuit according to claim 4, characterized in that: The ignition module (41) comprises a transformer T2, diodes D9, D6, D5, resistors R50, R56, and a capacitor C9. The transformer T2 comprises ports 1-4, wherein port 1 is connected to capacitor C9, the other end of capacitor C9 is connected to resistor R56, anode of diode D9, anode of diode D6, and anode of diode D5, the cathode of diode D5 is connected to the normally closed contact KJ8B of the ignition relay (42) via resistor R50, and port 2, the other end of resistor R56, cathode of diode D9, and cathode of diode D6 are connected to a neutral line N.

6. A wall-mounted boiler control circuit according to claim 5, characterized in that: The flame detection module (43) comprises resistors R57, R58, R59, R61, R62, R63, R64, R65, R66, R67, R68, R69, R70, R71, a flame sensing line P2, diodes D11, D12, capacitors C10, C11, C12, C13, C14, transistors Q4, Q6, an optical coupler isolation chip ISO2, and a zinc oxide varistor ZNR3, wherein the resistor R57 and the resistor R58 are connected to the control circuits of the ignition relays (42) KJ8A and KJ8B for voltage division, the resistor R59 is connected between the anode of the diode D11 and the positive electrode of the capacitor C10, the resistor R61 is grounded via the flame sensing line P2, and the resistor R62 is connected between the output of the optical coupler isolation chip ISO2 and the capacitor C11, resistor R63 is connected between optocoupler ISO2 and the base of transistor Q4, resistor R64 and resistor R67 are grounded from the other ends of capacitor C12 and capacitor C13 respectively, resistor R65 and resistor R66 are connected to the collector of transistor Q6, resistor R68 is connected from capacitor C13 to the base of transistor Q6, resistor R69 and capacitor C14 are connected between the base and emitter of transistor Q6, resistors R70 and R71 are grounded through zinc oxide varistor ZNR3, diodes D11 and D12 are connected between capacitor C10 and capacitor E5 for stabilizing voltage, capacitors C10, C11, C12, C13 and C14 are used for filtering and decoupling, and are connected to resistor R64, resistor R62, resistor R67, resistor R68 and resistor R69 respectively; Transistors Q4 and Q6 are used for signal amplification, Q4 is connected to the output of optocoupler ISO2, while Q6 is connected to another part of the circuit for further signal processing; The optocoupler isolation chip ISO2 is used for signal isolation of the circuit, receiving the signal from the resistor R62 and driving the transistor Q4.

7. A wall-mounted boiler control circuit according to claim 6, characterized in that: The relay module circuit (5) comprises a 7-channel Darlington transistor array driver chip (2) U1 of model ULN2003A, relay normally open contacts KJ1A, KJ2A, KJ3A, KJ4A, KJ5A, relay normally closed contacts KJ1B, KJ2B, KJ3B, KJ4B, KJ5B, diodes DZ2, D3, resistors R2, R24, R27, R39, R42, R43, R46, capacitors E7, E10, E39; The GND terminal of the driver chip (2) U1 is grounded, the COM port is connected to the power supply circuit (3), the driver chip (2) U1 further comprises ports IN1-IN7 and OUT1-OUT7, ports IN1-IN7 are connected to ports OUT1-OUT7, port IN2 is connected to the ignition port of the main control chip (1), port IN3 is connected to the three-way valve port of the main control chip (1), port IN4 is connected to the water pump port of the main control chip (1), and port IN5 is connected to the high wind port of the main control chip (1). , port IN6 is connected to the switch valve 1 port of the main control chip (1), port IN7 is connected to the switch valve 2 port of the main control chip (1), port OUT7 is connected to the relay normally open contact KJ5A, port OUT6 is connected to the relay normally open contact KJ3A, port OUT5 is connected to the relay normally open contact KJ2A, port OUT4 is connected to the relay normally open contact KJ4A, port OUT3 is connected to the relay normally open contact KJ1A, and port OUT2 is connected to the ignition-1 port of the ignition feedback circuit (4).

8. A wall-mounted boiler control circuit according to claim 1, characterized in that: It also includes a zero point detection circuit (6), which is located between the power supply circuit (3) and the main control chip (1) and is used to reduce electrical noise and electromagnetic interference during switching.

9. A wall-mounted boiler control circuit according to claim 8, characterized in that: The zero point detection circuit (6) comprises resistors R23, R25, R34, R45, an optocoupler isolation chip IC4, and a diode D16, wherein one end of the resistor R45 is connected to the INT port of the main control chip (1), the other end of the resistor R45 is connected to the resistor R34 and the 4th port of the optocoupler isolation chip IC4, the 1st port of the optocoupler isolation chip IC4 is connected to the anode of the diode D16, the 2nd port of the optocoupler isolation chip IC4 is connected to the cathode of the diode D16 and one end of the resistor R25, the other end of the resistor R25 is connected to the live wire through the resistor R23, and the 3rd port of the optocoupler isolation chip IC4 is grounded.

10. A wall-mounted boiler, characterized in that: It comprises a wall-mounted boiler control circuit as described in any one of claims 1 to 9.

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