Control system of intelligent gas stove

Abstract

The utility model discloses a control system of an intelligent gas stove, which comprises a power supply management module, an LED display driving module, an ignition control module, an ignition control module, a fan control module, a voice broadcast module and a central control unit. The system can stop ignition and give a voice prompt, so that gas leakage caused by misoperation is avoided; the gas consumption condition can be monitored in real time, so that a commercial kitchen manager can optimize a gas use strategy according to the use condition, and the gas utilization rate is improved; the combustion states of the small fire, the medium fire and the big fire are accurately controlled according to the main fire valve handle, a user can flexibly adjust the combustion intensity according to requirements, and unnecessary gas waste is avoided; the automatic front sweeping and rear sweeping functions are achieved, the fan is automatically operated before ignition and after flameout, residual gas in the combustion chamber is removed, the combustion stability is improved, and the potential safety hazard of residual gas after cooling is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a control system of intelligent gas stove belongs to gas stove control circuit field. BACKGROUND

[0002] The commercial gas stove on the market at present mainly relies on manual ignition and mechanical control, lacks intelligent management, and has problems such as inconvenient operation, gas waste and safety hazards. The existing gas stove has deficiencies in gas consumption statistics, fault detection and user interaction, therefore, a kind of commercial intelligent gas stove with intelligent control, automatic gas management, fault detection and voice prompt function is needed to improve safety and use convenience. INNOVATION CONTENT

[0003] The utility model aims at providing a control system of intelligent gas stove, which can effectively solve the above-mentioned problems.

[0004] In order to solve the above technical problems, the utility model is realized by the following technical scheme:

[0005] It includes power management module, LED display drive module, ignition control module, fan control module, voice broadcast module, gas flow statistical module and central control unit:

[0006] The LED display drive module includes nixie tube display unit, firepower indication unit, fan running state indication unit and voice broadcast prompt unit, for displaying working time, gas flow, ignition state and firepower size;

[0007] The ignition control module includes fire valve, main fire valve, ignition needle and main gas valve, the fire valve is used to ignite initial fire, the main gas valve is used to adjust gas flow, and the ignition needle is used to ignite gas and the main fire valve;

[0008] The fan control module controls the operation of the fan in the front cleaning, working and rear cleaning states, and dynamically lights up the fan icon when operating;

[0009] The voice broadcast module is used to prompt operation error, ignition failure and entering emergency state;

[0010] The central control unit receives the signals of each module, and controls gas supply, fan operation and display state.

[0011] Further, the nixie tube display unit of the LED display drive module is used to display working time in the form of increasing per minute, and display gas flow when the machine is in standby state.

[0012] Further, the firepower indication unit respectively lights up small fire, medium fire and large fire icons according to the position of main gas valve magnetic control switch.

[0013] Further: the ignition control module includes an ignition needle failure emergency circuit, when detecting an ignition needle failure, the main gas valve is closed, and after the fire valve is opened 5 times in succession, the fan performs a pre-blowing for 5 seconds, then a voice broadcast enters an emergency state, and manual ignition of a user is allowed.

[0014] Further: the ignition control module forms a closed loop control of "high pressure generation-gas release-flame feedback", which ensures that the gas source is automatically cut off when no flame is detected and a voice broadcast is performed.

[0015] Further: the fan control module enables the fan to rotate dynamically in the pre-blowing, working and post-blowing stages, and the icon in the running is illuminated.

[0016] Further: the gas flow statistical module displays specific gas flow when in standby, and saves gas usage data every 30 minutes in the maximum firepower state.

[0017] Beneficial effects are:

[0018] A safety protection mechanism is adopted, in the case that the fire valve or the main gas valve is not correctly operated, the system prevents ignition and gives a voice prompt, so that gas leakage caused by misoperation is avoided.

[0019] A gas flow statistical function can monitor the gas consumption in real time, record the gas usage data, so that the manager of a commercial kitchen can optimize the gas usage strategy according to the usage, improve the gas utilization rate, and reduce the operation cost.

[0020] The firepower is intelligently adjusted, the combustion state of small fire, medium fire and large fire is accurately controlled according to the main fire valve handle, so that the user can flexibly adjust the combustion intensity according to the requirement, and unnecessary gas waste is avoided.

[0021] The automatic pre-blowing and post-blowing functions automatically operate the fan before ignition and after extinguishing, remove the residual gas in the combustion chamber, improve the combustion stability, and avoid the safety hazard of residual gas after cooling. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to facilitate the description, the utility model is described in detail by the following specific implementation and drawings.

[0023] Figure 1 It is a circuit diagram of the utility model;

[0024] Figure 2 It is a single-chip microcomputer circuit diagram of the utility model;

[0025] Figure 3 It is a power management module circuit diagram of the utility model;

[0026] Figure 4The utility model discloses ignition control circuit diagram;

[0027] Figure 5 The utility model discloses ignition needle failure emergency circuit diagram;

[0028] Figure 6 The utility model discloses ignition control module circuit diagram;

[0029] Figure 7 The utility model discloses voice broadcast module circuit diagram;

[0030] Figure 8 The utility model discloses LED display drive module circuit diagram;

[0031] Figure 9 The utility model discloses linear voltage stabilizer circuit diagram; Specific implementation

[0032] Reference Figures 1-9 For the control system of an embodiment of the utility model one kind,

[0033] The system is a commercial intelligent gas stove control system, comprising a power management module, an LED display drive module, an ignition control module, a fan control module, a voice broadcast module, a gas flow statistical module and a central control unit. The central control unit uses a high-performance single-chip microcomputer (R5F10268ASP) as the main control core, integrates intelligent firepower control, automatic ignition management, gas flow monitoring, voice broadcast, fan control and other functions, and ensures safe and efficient operation.

[0034] The system has the functions of firepower adjustment (small fire, medium fire and large fire), ignition control (ignition icon display and ignition failure voice broadcast), fan control (front purging, running and rear cleaning), gas flow statistics (based on main gas valve magnetic control switch detection), full display self-checking, voice prompt (operation error, ignition failure and entering emergency mode), safety protection (ignition failure protection and emergency ignition mode) and the like.

[0035] Reference Figure 2 In the system, the main control module (MCU) mainly comprises U5 (R5F10268ASP), which functions to process logical control and control firepower, fan and display.

[0036] Reference Figure 3The power management module in the system: the main components are U2 (KBL406), U1 (7805), C6, L2 AC100V to DC, providing +5V and +24V stable power supply; using AC100V mains as input power, through rectification, filtering, voltage reduction, voltage stabilization and other links, respectively output +5V DC voltage and +24V voltage; +5V voltage supplies the main control single-chip microcomputer MCU, TM1640 display driver, voice circuit and other digital logic modules; +24V DC voltage supplies relays, solenoid valves, fans and other power equipment;

[0037] Referring to Figure 9 For +5V DC power supply: through the linear voltage regulator U1 (7805), the +8V voltage is stabilized to +5V voltage; for the linear voltage regulator U1, input filtering is performed through C26 and C29, and output filtering is performed through C27 and C28, to supply power to the single-chip microcomputer MCU (R5F10268ASP), the TM1640 display driver chip, the buzzer, the key circuit and the like;

[0038] The power management module adopts a multi-stage power conversion structure to safely and stably convert 220V mains high voltage into +8V and +24V DC voltages required by the system. First, 220V AC power is input to the rectifier bridge U2 (KBL406) after removing high-frequency interference through the EMI filter (including common-mode inductor T1 and Y capacitor), and is rectified into about 310V DC. The high-voltage DC enters the flyback switching power supply circuit composed of the PWM controller U4 (OB2273), the MOS tube Q1 (6N65) and the high-frequency transformer T2. The PWM controller U4 (OB2273) performs high-speed switching to make the high-voltage DC generate periodic magnetic field changes on the primary side of the transformer T2, thereby inducing multiple low-voltage AC outputs on the secondary side.

[0039] The secondary winding realizes different voltage outputs through different branches: one branch is rectified by a Schottky diode and filtered by capacitors C6 / C5 to obtain a stable +24V DC voltage, which is used to drive fans, solenoid valves, relays and other power devices;

[0040] Another branch is rectified by a Schottky diode and filtered by capacitors C13 / C14 to output about +8V voltage, which is supplied to the linear voltage regulator U1 (7805) after rectification and filtering, and the linear voltage regulator U1 (7805) outputs accurate +5V voltage to supply power to the digital circuit part of the single-chip microcomputer MCU (R5F10268ASP), the display control chip (TM1640), the key circuit and the voice module.

[0041] At the same time, in the power management module, an energy conversion circuit and a voltage feedback and isolation control circuit are also provided.

[0042] The energy conversion circuit is composed of PWM controller U4 (OB2273), MOS tube Q1 (6N65) and high frequency transformer T2; in the energy conversion circuit, PWM controller U4 (OB2273) outputs a driving signal to make MOS tube Q1 (6N65) switch at high frequency - when conducting, direct current high voltage is stored in the primary winding of T2, and when cut off, low voltage alternating current is induced in the secondary winding of T2, and after rectification and LC filtering, stable +24V and +5V are output.

[0043] The voltage feedback and isolation control circuit is composed of optocoupler U3 (PC817) and reference voltage Q4 (TL431); reference voltage Q4 (TL431) samples and compares the low voltage (+5V) output from the secondary side through the internal fixed voltage reference source, and after comparison, a voltage error is generated; at the same time, the cathode output of reference voltage Q4 (TL431) is output to the input end (light emitting diode) of optocoupler U3 (PC817), and the voltage error signal is transmitted to the FB pin of PWM controller U4 (OB2273) in an optocoupler isolation mode, realizing electrical isolation feedback between the primary and the secondary;

[0044] The output end of optocoupler U3 (PC817) converts the light signal into a current signal through a photosensitive element, cooperates with the internal error amplifier of PWM controller U4 (OB2273) to adjust the PWM duty cycle, so that the output voltage is stabilized within a precision range of ±1%, and at the same time, completely isolates the interference of high frequency switching noise on the secondary circuit, ensuring the reliability and safety of the power supply system under a wide load range; effectively preventing surge, voltage fluctuation or short circuit from causing damage to the system.

[0045] The valves used in the system include a fire valve, a main fire valve, an ignition needle and a main gas valve; the fire valve is used to ignite the initial fire, the main gas valve is used to adjust the gas flow, and the ignition needle is used to ignite the gas and the main fire valve; the main fire valve control circuit controls the opening and closing of the main fire valve, the fire valve control circuit controls the opening and closing of the fire valve, and the main gas valve control circuit controls the opening and closing of the main gas valve.

[0046] Referring to Figure 4 , the main fire valve control circuit is provided with transistors such as D7 (1N4007 rectifier diode), Q6 (2SB857) and Q9 (8050), and is on the +24V power supply branch, and is used for freewheeling protection of the main fire valve control circuit; when Q6 or Q9 controls the on-off of the electromagnetic valve, D7 provides a bypass for the reverse induced voltage, protecting the transistor from being broken down by the reverse voltage.

[0047] The fire valve control circuit is provided with transistors such as D8 (1N4007 rectifier diode), Q7 (B649) and Q8 (8050), and is on the +24V power supply branch; the function is similar to that of the main fire valve control circuit, and is used for freewheeling protection of the fire valve control circuit;

[0048] D6 (1N4007 rectifier diode), Q3 (B649), Q5 (8050) and other transistors in the main gas valve control circuit are set in the +24V power supply branch; for the freewheeling protection of the main gas valve control circuit.

[0049] The main gas valve control circuit, the fire valve control circuit and the main fire valve control circuit control logic are similar, which are typical NPN transistor switch control solenoid valve circuits; but at the same time, the fire valve control circuit and the main gas valve control circuit are connected to the same load, and after power-on, the fire valve switch is rotated, the machine starts to ignite, at this time, if it is detected that the main gas valve switch is opened and the main fire valve handle is not in the closed state position, the fire valve cannot ignite the fire, and the operation error is reported by voice, and the corresponding operation error icon is lit (remark: the operation error icon is only for the fire valve and the main fire valve operation).

[0050] Referring to Figure 5 In order to make the user more safe when using, the ignition control circuit also includes an ignition needle fault emergency circuit, the main components of which are voltage comparator N1 (ALM393), which is used for safety monitoring of the flame state; the same phase input end (Pin3) receives the analog signal of the flame sensor (ignition needle), and the preset reference voltage of the opposite phase input end (Pin2) is compared in real time. When the flame burns normally, the sensor signal voltage is higher than the threshold, the output end (Pin1) maintains high level, and the MCU determines that it is in a safe state; if the flame is accidentally extinguished, the signal voltage drops below the threshold, the output immediately flips to low level, triggering the MCU to close the solenoid valve and start voice broadcast (such as "ignition failure").

[0051] For the ignition needle fault emergency mode: first close the main gas valve to the closed state, then open the fire valve door 5 times in succession, after 5 seconds of pre-blowing, the voice broadcast prompts to enter the emergency state, then manually ignite, open the fire valve, and automatically open the main gas solenoid valve after 6 seconds. If the ignition is unsuccessful for several times, the voice broadcast is "ignition failure".

[0052] Referring to Figure 6 In the ignition control module in the system, a two-stage boost system is adopted to realize safe ignition, which is composed of high-frequency transformers T4 and T3; T4 is used as a pre-boost transformer to convert low-voltage direct current (such as +5V) into medium-frequency alternating current, which drives the high-voltage pack of T3 after rectification by D12 (FR107); T3 is used as a high-voltage pack, which generates an electric spark through high-voltage pack boost and spark needle tip discharge. The MCU (R5F10268ASP) synchronously controls the opening timing of the fire valve (XS2 interface) and monitors the flame signal (XS1 interface) in real time, forming a closed-loop control of "high-voltage generation-gas release-flame feedback", which ensures that the gas source is automatically cut off and voice broadcast is performed when no flame is detected.

[0053] In the ignition control module, Q10, Q11 (2SA1201GPNP triode) and Q13 (8050NPN triode) together constitute a hierarchical electromagnetic valve drive system: provide stable +24V drive current for the fire valve and the main gas valve.

[0054] Q10 as the power drive switch of the fire valve, when the MCU (R5F10268ASP) outputs a low-level signal, Q10 turns from cut-off to saturated conduction, and loads the power supply voltage to the fire valve coil, forcing the valve to open and release gas.

[0055] Q11 as the drive tube of the main gas valve, after the fire valve successfully ignites, the MCU outputs a level signal to control the opening of the main gas valve.

[0056] Q13 is responsible for converting the MCU signal into sufficient current to drive the base of Q10. When the MCU pin outputs a high level, Q13 is saturated and conducts, pulling down the Q10 base potential to make it conduct, forming a high-low voltage isolation control link.

[0057] In the ignition stage, Q11 is controlled by Q13 and the fire adjustment signal, and opens the main gas valve as needed after the pre-fire is successful. This three-stage tube combination design realizes strict timing of valve action (fire valve opens first, main gas valve delays for 6 seconds) through MCU cascade control.

[0058] Referring to Figure 7 , the fan control module, when the MCU (R5F10268ASP) outputs a high-level signal, the triode Q12 (8050) is turned on, the relay K1 coil is energized, and the contacts are closed after the fan starts to exhaust. The diode D15 (1N4007) connected in parallel across the relay coil effectively absorbs the reverse electromotive force generated during power-off, protecting the drive tube Q12 from damage, while the base current limiting resistor R50 ensures stable transmission of the control signal; R53 is a pull-down resistor.

[0059] And through the fan operation state indication unit driven by TM1640, the fan operation state is displayed in real time, forming a complete fan control and state feedback link.

[0060] The voice broadcast prompt unit has three pre-recorded voice broadcast functions: "operation error", "ignition failure", and "entering emergency state".

[0061] Referring to Figure 8In the LED display driving module, the main component is U6 (TM1640), which is responsible for the display of the digital tube, LED and firepower icon; TM1640 as the LED display driving chip receives the instruction of MCU (R5F10268ASP) through the serial communication interface, dynamically controls four 8-segment digital tubes and state indicator lights (such as firepower icon, fan rotation animation): its built-in display RAM can store preset character codes, automatically scan and refresh output, support 8-level brightness adjustment; real-time display of working time, gas flow and fault code, at the same time linkage firepower indicating unit (small fire / medium fire / large fire icon filling) and fan running state indicating unit, to realize multi-task display with low power consumption, significantly reduce the refresh burden of MCU.

[0062] After power-on, standby display is performed, when the fire valve switch is rotated, the machine starts to ignite, the fan starts to rotate, the corresponding firepower indicating unit displays small fire, and the corresponding arc-shaped icon is lit. The working time starts to count up from 0, at this time, if the main gas valve switch is detected to be opened and the main fire valve handle is not in the closed state position, the fire valve cannot ignite the fire, the voice broadcast prompt unit voice broadcasts the operation error, and the corresponding operation error icon is lit (note: the operation error icon is only prompted when the fire valve and the main fire valve are operated).

[0063] When the pre-fire is successful, the main control valve switch can be used to adjust the firepower, and the corresponding firepower indicating unit icon is displayed accordingly.

[0064] When the machine is in standby, the specific gas flow number is displayed, and the corresponding gas flow icon is lit. When the machine is working, the working time of the machine is displayed (now it is calculated as 3.5 square meters per hour, and it is saved every 30 minutes, and it is calculated and saved only when it is the maximum firepower).

[0065] The firepower indicating unit, the fan running state indicating unit and the voice broadcast prompt unit are used to display the working time, the gas flow, the ignition state and the firepower.

[0066] Obviously, the above embodiments are only examples for clear illustration, and are not limitations to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A control system of an intelligent gas stove, characterized in that: The application relates to a gas stove, which comprises a power management module, an LED display driving module, an ignition control module, a fan control module, a voice broadcast module, a gas flow statistical module and a central control unit; the LED display driving module comprises a digital tube display unit, a firepower indication unit, a fan operation state indication unit and a voice broadcast prompt unit, which are used for displaying working time, gas flow, ignition state and firepower size; the ignition control module comprises a fire valve, a main fire valve, an ignition needle and a main gas valve; the fire valve is used for igniting initial fire, the main gas valve is used for adjusting gas flow, and the ignition needle is used for igniting gas and the main fire valve; the fan control module controls the operation of the fan in the pre-cleaning, working and post-cleaning states, and dynamically lights up the fan icon during operation; the voice broadcast module is used for prompting operation errors, ignition failure and entering an emergency state; the central control unit receives signals of each module and controls gas supply, fan operation and display state.

2. The control system of the intelligent gas stove as claimed in claim 1, wherein, The digital tube display unit of the LED display driving module is used for displaying working time in a per-minute incremental mode and displaying gas flow in a machine standby state.

3. The control system of the intelligent gas stove as claimed in claim 1, wherein, The firepower indication unit respectively lights up small fire, medium fire and large fire icons according to the position of a main gas valve magnetic control switch.

4. The control system of the intelligent gas stove as claimed in claim 1, wherein, The ignition control module comprises an ignition needle fault emergency circuit; when the ignition needle fault is detected, the main gas valve is closed, the fire valve door is continuously opened for 5 times at a high speed, the fan executes pre-blowing for 5 seconds, then the voice broadcast enters an emergency state, and manual ignition of a user is allowed.

5. The control system of the intelligent gas stove as claimed in claim 1, wherein, The ignition control module forms a closed loop control of "high pressure generation-gas release-flame feedback", which ensures that the gas source is automatically cut off and voice broadcast is performed when the flame is not detected.

6. The control system of the intelligent gas stove as claimed in claim 1, wherein, The fan control module dynamically rotates the fan in the pre-cleaning, working and post-cleaning stages, and the icon is lighted up during operation.

7. The control system of the intelligent gas stove as claimed in claim 1, wherein, The gas flow statistical module displays specific gas flow in a standby state, and saves gas usage data every 30 minutes in a maximum firepower state.

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