Control circuit for gas stoves with touch screen display and gas stove

Abstract

This invention provides a control circuit and a gas stove with a touch screen display. The gas stove includes an ignition mechanism, a flame detection mechanism, a first electromagnetic proportional valve, a second electromagnetic proportional valve, and a shut-off valve. It also includes a controller and a touch screen display. The controller includes a control center proportional valve control circuit, a shut-off valve control circuit, an ignition control circuit, a flame detection control circuit, and a touch screen display driving circuit. The touch screen display is used to acquire touch commands and send them to the control center. The control center is used to execute corresponding controls based on the touch commands. This invention enables accurate adjustment of gas heat during cooking, improving the taste and color of dishes.

Description

Technical Field

[0001] This invention relates to the field of gas stove technology, and more specifically to a control circuit for a gas stove with a touch screen display and a gas stove. Background Technology

[0002] Gas stoves primarily use liquefied petroleum gas, manufactured gas, and natural gas for heating. The gas enters the stove through the gas inlet pipe, is regulated by the gas valve, and then enters the burner head, where it mixes with some air. The mixed gas is then ejected through the inner and outer ring burners and burned.

[0003] Existing gas stoves adjust the gas valve opening via mechanical knobs or similar mechanisms, requiring manual operation to regulate the gas intake. This is too rudimentary. As people increasingly value the taste and color of their dishes, they often wish to cook according to chefs' methods. Although some online recipes may provide different suggestions on the appropriate heat level, it is difficult to achieve this manually. The excessively rough heat adjustment makes it hard to produce chef-quality results. Summary of the Invention

[0004] Based on the above situation, the main objective of this invention is to provide a control circuit and a gas stove for a gas stove with a touch screen display, so as to achieve accurate adjustment of gas firepower during cooking and improve the taste and color of dishes.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A first aspect of the present invention provides a gas stove, including a burner, the burner including an ignition mechanism, a flame detection mechanism, an inner ring fire channel, an outer ring fire channel, a first electromagnetic proportional valve communicating with the inner ring fire channel, a second electromagnetic proportional valve communicating with the outer ring fire channel, and a shut-off valve, wherein the first electromagnetic proportional valve and the second electromagnetic proportional valve are connected to the gas supply end through the shut-off valve.

[0007] It also includes a controller and a touch display screen;

[0008] The controller includes a control center, a proportional valve control circuit corresponding to each electromagnetic proportional valve, a shut-off valve control circuit, an ignition control circuit, a flame detection control circuit, and a touch display drive circuit.

[0009] The control center has a proportional valve control port, a shut-off valve control port, an ignition control port, a flame detection port, and a touch display port.

[0010] Each electromagnetic proportional valve is connected to the proportional valve control port via a corresponding proportional valve control circuit. The shut-off valve is connected to the shut-off valve control port via a shut-off valve control circuit. The ignition mechanism is connected to the ignition control port via an ignition control circuit. The flame detection mechanism is connected to the flame detection port via a flame detection control circuit. The touch screen is connected to the touch display port via a touch display driver circuit.

[0011] The touch display screen is used to acquire touch commands and send the touch commands to the control center;

[0012] The control center is used to execute corresponding controls based on the touch commands:

[0013] If the touch command includes an ignition command, the control center controls the shut-off valve to open according to the ignition command and controls the ignition mechanism to ignite.

[0014] If the touch command includes a firepower adjustment command, the control center determines the input current values ​​of the first electromagnetic proportional valve and the second electromagnetic proportional valve according to the firepower adjustment command, and outputs PWM signals to the proportional valve control ports corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on their respective input current values.

[0015] Preferably, the proportional valve control circuit includes an amplification module, an adjustment module, and a feedback module. The adjustment module includes a transistor, a field-effect transistor, a Zener diode unit, and a protection resistor unit.

[0016] The protective resistor unit is connected to both ends of the Zener diode unit, and also to the source and gate of the field-effect transistor. The end connected to the source is also connected to a first power supply, and the end connected to the gate is connected to the collector of the transistor. The drain of the field-effect transistor is connected to the first terminal of the electromagnetic proportional valve. The emitter of the transistor is connected to system ground, and the base is connected to the output terminal of the amplification module. The amplification module includes a comparator, whose positive power supply terminal is connected to a second power supply, its negative power supply terminal is connected to system ground, its positive input terminal is connected to the control port of the electromagnetic proportional valve, and its inverting input terminal is connected to the second terminal of the proportional valve. The feedback module includes a feedback resistor unit, whose two ends are connected to the second terminal of the electromagnetic proportional valve and system ground, respectively.

[0017] Preferably, the Zener diode unit includes a first Zener diode and a second Zener diode, the anode of the first Zener diode is connected to the anode of the second Zener diode, and the cathodes of the two are respectively connected to the two ends of the protection resistor unit.

[0018] Preferably, the protection resistor unit includes a first resistor and a second resistor connected in parallel.

[0019] Preferably, the feedback resistor unit includes a third resistor and a fourth resistor connected in series.

[0020] Preferably, the feedback module further includes a fifth resistor and a sixth resistor connected in series. The two ends of the fifth resistor and the sixth resistor connected in series are respectively connected to the second end of the electromagnetic proportional valve and the second power supply. The inverting input of the comparator is connected between the fifth resistor and the sixth resistor.

[0021] Preferably, the amplification module further includes a first filter capacitor, a second filter capacitor, a third filter capacitor, a first current-limiting resistor, and a pull-up resistor. The first filter capacitor is connected between the positive input terminal of the comparator and system ground; the second filter capacitor is connected between the negative input terminal of the comparator and system ground; the third filter capacitor is connected between the second power supply and the positive power supply terminal of the comparator; the pull-up resistor is connected between the output terminal of the comparator and the second power supply; and the first current-limiting resistor is connected between the proportional valve control terminal and the positive input terminal of the comparator.

[0022] Preferably, the adjustment module further includes a second current-limiting resistor and a third current-limiting resistor, wherein the second current-limiting resistor is connected between the output terminal of the amplification module and the base of the transistor; and the third current-limiting resistor is connected between the collector of the transistor and the gate of the MOS transistor.

[0023] Preferably, the proportional valve control circuit further includes a freewheeling diode, the negative terminal of which is connected between the first terminal of the electromagnetic proportional valve and the drain of the MOS transistor, and the positive terminal is connected to system ground.

[0024] Preferably, the controller further includes a wireless module, and the control center further includes a wireless signal acquisition port connected to the wireless module. The control center performs corresponding control based on the acquired wireless signal.

[0025] If the wireless signal includes temperature data, the control center controls the touch screen to display the temperature data;

[0026] If the wireless signal includes recipe data, the control center controls the display screen to show the recipe data.

[0027] Preferably, if the touch command includes an ideal temperature value, the control center further determines the input current value of the electromagnetic proportional valve based on the ideal temperature value and the temperature information obtained through the wireless module, and outputs a PWM signal to the proportional valve control circuit based on the input current value to control the operation of the electromagnetic proportional valve.

[0028] Preferably, the gas stove includes multiple burners. If the touch control command includes a burner selection command, the control center sends the control command formed by the ignition command and the firepower adjustment command to the ignition mechanism and proportional valve control circuit of the corresponding burner according to the burner selection command.

[0029] A second aspect of the present invention provides a control circuit for a gas stove having a touch screen display, comprising:

[0030] The control center has a proportional valve control port, a shut-off valve control port, an ignition control port, a flame detection port, and a touch display port;

[0031] A proportional valve control circuit corresponding to each electromagnetic proportional valve is connected to the corresponding proportional valve control port for controlling each electromagnetic proportional valve.

[0032] A shut-off valve control circuit is connected to the shut-off valve control port to control the opening and closing of the shut-off valve;

[0033] A flame detection control circuit is connected to the flame detection port to transmit the flame detection result to the control center;

[0034] A touch display driver circuit is connected to the touch display port to control the operation of the touch display screen and transmit the touch commands of the touch display screen to the control center;

[0035] The control center is used to execute corresponding controls based on the touch commands:

[0036] If the touch command includes an ignition command, the control center controls the shut-off valve to open according to the ignition command and controls the ignition mechanism to ignite.

[0037] If the touch command includes a firepower adjustment command, the control center determines the current value of the proportional valve based on the firepower adjustment command, and outputs a PWM signal to the proportional valve control ports corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on the current value.

[0038] Preferably, the proportional valve control circuit includes:

[0039] The adjustment module includes a transistor, a MOSFET, a Zener diode unit, and a protection resistor unit. The two ends of the protection resistor unit are connected to the two ends of the Zener diode unit, and also to the source and gate of the MOSFET. One end connected to the source is connected to a first power supply, and the other end connected to the gate is connected to the collector of the transistor. The drain of the MOSFET is connected to the first terminal of a proportional valve. The emitter of the transistor is grounded, and the base is connected to the output terminal of the amplification power supply.

[0040] The amplification module includes a comparator, wherein the positive power supply terminal of the comparator is connected to a second power supply, the negative power supply terminal is connected to system ground, the positive input terminal is connected to the control port of the proportional valve, and the inverted input terminal is connected to the second end of the proportional valve.

[0041] The feedback module includes a feedback resistor unit, the two ends of which are respectively connected to the second end of the proportional valve and the system ground;

[0042] A freewheeling diode, wherein the negative terminal of the freewheeling diode is connected between the first terminal of the proportional valve and the drain of the MOS transistor, and the positive terminal is connected to system ground.

[0043] The gas stove of the present invention is equipped with a touch screen display, and the controller further includes a touch screen display driving circuit. The control center is connected to the touch screen display, the ignition mechanism, the flame detection mechanism, and each proportional valve and shut-off valve through their respective control circuits. Thus, when ignition or firepower adjustment is required, it can be controlled by touch operation of the touch screen display to make precise adjustments based on the firepower information prompted by the recipe. It can even make precise adjustments to the opening of the proportional valve based on the temperature or firepower in the navigation recipe when the navigation recipe is automatically run after selecting the navigation recipe by touch operation.

[0044] Other beneficial effects of the present invention will be explained in detail through the introduction of specific technical features and technical solutions in specific embodiments. Those skilled in the art should be able to understand the beneficial technical effects brought about by these technical features and technical solutions through the introduction of these technical features and technical solutions. Attached Figure Description

[0045] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the drawings:

[0046] Figure 1 A system diagram of a preferred embodiment of the gas stove provided by the present invention;

[0047] Figure 2 A schematic diagram of a preferred embodiment of the proportional valve control circuit provided by the present invention;

[0048] Figure 3This is a schematic diagram of a preferred embodiment of the ignition control circuit in the control circuit provided by the present invention.

[0049] In the picture,

[0050] 10. Burner; 11. Ignition mechanism; 12. Flame detection mechanism; 13. First electromagnetic proportional valve; 14. Second electromagnetic proportional valve; 15. Shut-off valve;

[0051] 20. Controller; 21. Control Center; 22. Proportional Valve Control Circuit; 221. Amplification Module; 222. Adjustment Module; 223. Feedback Module; 23. Shut-off Valve Control Circuit; 24. Ignition Control Circuit; 25. Flame Detection Control Circuit; 26. Touch Display Driver Circuit;

[0052] 30. Touch screen display. Detailed Implementation

[0053] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail, but well-known methods, processes, procedures, and elements are not described in detail in order to avoid obscuring the essence of the present invention.

[0054] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0055] Unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than being exclusive or exhaustive; that is, meaning "including but not limited to."

[0056] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0057] This invention provides a gas stove, such as Figure 1As shown, the device includes a burner 10, which includes an ignition mechanism 11, a flame detection mechanism 12, an inner ring fire channel, an outer ring fire channel, a first electromagnetic proportional valve 13 connected to the inner ring fire channel, a second electromagnetic proportional valve 14 connected to the outer ring fire channel, and a shut-off valve 15. The first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 are connected to the gas supply end through the shut-off valve 15. Specifically, there may be only one burner 10, or there may be multiple burners, such as two, three, or more. The gas supply end is connected to the shut-off valve 15 of each burner 10 through the main gas inlet pipe. The two outlets of the shut-off valve 15 are connected to the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14, respectively. Thus, the gas needs to enter the inner ring fire channel and the outer ring fire channel through the shut-off valve 15, the first electromagnetic proportional valve 13, and the second electromagnetic proportional valve 14.

[0058] The gas stove also includes a controller 20 and a touch display screen 30. The controller 20 includes a control center 21, a proportional valve control circuit 22 corresponding to each electromagnetic proportional valve, a shut-off valve control circuit 23, an ignition control circuit 24, a flame detection control circuit 25, and a touch display drive circuit 26. The control center 21 has a proportional valve control port, a shut-off valve control port, an ignition control port, a flame detection port, and a touch display port.

[0059] Each electromagnetic proportional valve is connected to the proportional valve control port via a corresponding proportional valve control circuit. That is, the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 are respectively connected to a first proportional valve control circuit and a second proportional valve control circuit. The control center has corresponding first and second proportional valve control ports. The first electromagnetic proportional valve 13 is connected to the first proportional valve control port via the first proportional valve control circuit, and the second electromagnetic proportional valve 14 is connected to the second proportional valve control port via the second proportional valve control circuit. The shut-off valve 15 is connected to the shut-off valve control port via the shut-off valve control circuit 23. The ignition mechanism 11 is connected to the ignition control port via the ignition control circuit 24. The flame detection mechanism 12 is connected to the flame detection port via the flame detection control circuit 25. The touch display screen 30 is connected to the touch display port via the touch display drive circuit 26. When multiple burners 10 are provided, each burner 10 is equipped with a set of first electromagnetic proportional valve 13, second electromagnetic proportional valve 14, first proportional valve control circuit, second proportional valve control circuit, first proportional valve control port and second proportional valve control port, shut-off valve 15, shut-off valve control circuit 23, ignition mechanism 11, ignition control circuit 24, flame detection mechanism 12 and flame detection control circuit. It should be noted that even when multiple burners 10 are provided, only one set of touch display screen 30 and touch display drive circuit 26 can be provided, allowing different burners 10 to be controlled through the same touch display screen 30.

[0060] Specifically, the touch display screen 30 is used to acquire touch commands and send them to the control center 21. In other words, the touch display screen 30 serves as the user interface for the gas stove, allowing the user to control the gas stove via touch. When the touch display screen 30 is touched, a touch command is generated. After receiving the touch command through the touch display driver circuit 26, the control center 21 executes the corresponding control according to the touch command.

[0061] If the touch command includes an ignition command, the control center 21 controls the shut-off valve 15 to open according to the ignition command and controls the ignition mechanism 11 to ignite. That is, the control center 21 outputs a shut-off valve opening signal to the shut-off valve control port according to the ignition command. After receiving the shut-off valve opening signal, the shut-off valve control circuit 23 controls the shut-off valve 15 to open and simultaneously outputs a control signal (which can be a preset PWM signal corresponding to the opening degree of the electromagnetic proportional valve) to the proportional valve control port. The proportional valve control circuit 22 controls the electromagnetic proportional valve to open. The control center 21 also outputs an ignition signal to the ignition control port. After receiving the ignition signal, the ignition control circuit 24 controls the ignition mechanism 11 to ignite.

[0062] If the touch command includes a firepower adjustment command, the control center 21 determines the input current values ​​of the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 according to the firepower adjustment command, and outputs PWM signals to the proportional valve control ports corresponding to the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 based on their respective input current values. That is, the control center 21 first determines the input current value of the first electromagnetic proportional valve 13 (denoted as the first current value) and the input current value of the second electromagnetic proportional valve 14 (denoted as the second current value) according to the firepower adjustment command, and then outputs a first PWM signal to the first proportional valve control port based on the first current value. After receiving the first PWM signal, the first electromagnetic proportional valve control circuit controls the opening degree of the first electromagnetic proportional valve 13; and outputs a second PWM signal to the second proportional valve control port based on the second current value. After receiving the second PWM signal, the second electromagnetic proportional valve control circuit controls the opening degree of the second electromagnetic proportional valve 14.

[0063] The aforementioned ignition and heat adjustment commands can be directly input by the user through the touch screen 30. These touch commands directly include the ignition and heat adjustment commands; that is, they are the direct touch commands generated by the user's touch operation on the touch screen 30. These commands can also be indirectly included within the touch commands. Specifically, sometimes the gas stove can operate automatically using a navigation menu. In this case, the user can simply select a navigation menu through the touch screen 30, and the gas stove will automatically operate and cook according to the navigation menu. In this embodiment, the touch command is actually the selection of the navigation menu, which includes multiple cooking stages. Each cooking stage includes ignition and heat adjustment commands. After receiving the touch command, the control center 21 will sequentially execute each cooking stage of the navigation menu. When the cooking stage containing the ignition command is running, the control center 21 generates a shut-off valve opening signal based on the ignition command of that cooking stage. When the cooking stage containing the heat adjustment command is running, the control center 21 generates a first current value and a second current value based on the heat adjustment command of that cooking stage.

[0064] Understandably, after successful ignition, the control center 21 will also generate a stop ignition signal and output it to the ignition control port, so that the ignition control circuit 24 can control the ignition mechanism 11 to stop working. Whether ignition is successful or not can be detected by the flame detection mechanism 12. When the flame detection mechanism 12 detects a flame, it sends a flame signal to the flame detection port, and the control center 21 generates an ignition signal or a stop ignition signal based on the flame signal.

[0065] The gas stove described above is equipped with a touch screen display 30. The controller 20 also includes a touch screen display drive circuit 26. The control center 21 is connected to the touch screen display 30, the ignition mechanism 11, the flame detection mechanism 12, and each electromagnetic proportional valve (including the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14) and the shut-off valve 15 through their respective control circuits. In this way, when ignition or firepower adjustment is required, it can be controlled by touch operation of the touch screen display 30 to make precise adjustments based on the firepower information prompted by the recipe. It can even make precise adjustments to the opening of the proportional valve based on the temperature or firepower in the navigation recipe when the navigation recipe is automatically run after selection by touch operation.

[0066] In fact, when the control center 21 receives the fire off command, it also generates a shut-off valve closing signal and sends it to the shut-off valve control port to control the shut-off valve 15 to close via the shut-off valve control circuit 23. This fire off command can also be generated by directly touching the touchscreen display 30, or it can be a command included in a navigation menu generated via the touchscreen display 30.

[0067] Specifically, the connection method between the first electromagnetic proportional valve 13 and the first proportional valve control circuit is the same as the connection method between the second electromagnetic proportional valve 14 and the second proportional valve control circuit. Therefore, the first electromagnetic proportional valve and its corresponding proportional valve control circuit 22 are used as examples in this paper. For ease of expression, the first electromagnetic proportional valve is simply referred to as the electromagnetic proportional valve, and the first proportional valve control circuit is simply referred to as the proportional valve control circuit.

[0068] like Figure 2 As shown, the proportional valve control circuit 22 includes an amplification module 221, an adjustment module 222, and a feedback module 223. The adjustment module 222 includes a transistor Q1, a field-effect transistor (FET), a Zener diode unit, and a protection resistor unit. The two ends of the protection resistor unit are connected to the two ends of the Zener diode unit, and also to the source and gate of the FET. The end connected to the source is also connected to the first power supply VC1, and the end connected to the gate is also connected to the collector of the transistor Q1. The drain of the FET is connected to the first terminal of the electromagnetic proportional valve. The emitter of the transistor Q1 is connected to system ground, and the base is connected to the output terminal of the amplification module 221. The amplification module 221 includes a comparator U1. The positive power supply terminal of the comparator U17 is connected to the second power supply VC2, and the negative power supply terminal is connected to system ground. The positive input terminal is connected to the control port of the electromagnetic proportional valve, and the inverting input terminal is connected to the second terminal of the electromagnetic proportional valve. The feedback module 223 includes a feedback resistor unit, with its two ends connected to the second terminal of the electromagnetic proportional valve and system ground, respectively.

[0069] When the gas stove is working, when the control center 21 receives a firepower adjustment command, it processes the data to obtain a PWM signal corresponding to the command. This PWM signal has a certain duty cycle and is output to the proportional valve control port. The proportional valve control circuit 22 compares the received PWM signal with the voltage of the feedback module of the electromagnetic proportional valve's input current through comparator U1, controlling the output of comparator U1. Specifically, when the opening of the electromagnetic proportional valve is too large (i.e., the input current value is too large), the output of comparator U1 will output a signal to control transistor Q1 and MOSFET Q2 to turn off, thereby reducing the input current flowing through the electromagnetic proportional valve, i.e., reducing the opening of the electromagnetic proportional valve. Conversely, when the opening of the electromagnetic proportional valve is too small, the output of comparator U1 will output a control signal to control transistor Q1 and MOSFET Q2 to turn on, increasing the input current of the electromagnetic proportional valve, i.e., increasing the opening of the electromagnetic proportional valve. Ultimately, the opening of the electromagnetic proportional valve is maintained at a small fluctuation above and below the firepower value corresponding to the firepower command, i.e., in a stable state. In this invention, firstly, the adjustment module 222 uses a combination of transistor Q1 and MOSFET Q2 to control the electromagnetic proportional valve, resulting in higher efficiency and lower power consumption. Furthermore, the entire proportional valve control circuit 22 can isolate external interference, increasing the stability of the proportional valve's operation and thus improving the control accuracy. Secondly, if the impedance between the gate and source of MOSFET Q2 is too high, a sudden change in the drain-source voltage will couple to the gate through the inter-electrode capacitance, generating a considerably high gate-source voltage overshoot. This voltage can cause permanent damage to the gate oxide layer, and if it is a positive transient voltage, it can also cause mis-conduction of the device. Therefore, the impedance of the gate drive circuit needs to be appropriately reduced. In this invention, the adjustment module 222 also includes a Zener diode unit and a protection resistor unit, both located between the gate and source of MOSFET Q2. The protection resistor unit can limit the current flowing through the Zener diode unit. Thus, the combination of these two components can stabilize the voltage, preventing the gate of MOSFET Q2 from operating open-circuit, protecting MOSFET Q2, and thereby improving the reliability of the entire proportional valve control circuit 22. Thirdly, the adjustment module 222 of the present invention also includes a feedback resistor unit, which is connected between the second end of the electromagnetic proportional valve and the system ground to form a sampling circuit. The current in the sampling circuit is fed back to the inverting input of the comparator U1 and compared with the PWM signal at the positive input, thereby achieving precise control of the entire proportional valve control circuit 22 and improving the accuracy of the electromagnetic proportional valve control.

[0070] Specifically, the Zener diode unit may include only one Zener diode. In a preferred embodiment of the present invention, the Zener diode unit includes a first Zener diode D1 and a second Zener diode D2. The anode of the first Zener diode is connected to the anode of the second Zener diode, and their cathodes are respectively connected to the two ends of the protection resistor unit. Considering that the MOSFET Q2 is connected to an electromagnetic proportional valve, the electromagnetic proportional valve will generate a relatively high instantaneous voltage when suddenly powered on and suddenly de-powered. Through two Zener diodes connected in reverse series, the MOSFET Q2 can be bidirectionally regulated. When there is an overvoltage between the source and gate of the MOSFET Q2, the first Zener diode D1 and the second Zener diode D2 are first broken down and short-circuited, thereby better protecting the MOSFET Q2.

[0071] The protection resistor unit may consist of only one resistor. In this invention, it includes a first resistor R1 and a second resistor R2 connected in parallel. The combination of these two resistors can achieve a voltage divider effect, thus better protecting the MOSFET.

[0072] The feedback resistor unit includes a third resistor R3 and a fourth resistor R4 connected in series. By connecting these two resistors in series, the feedback current of the electromagnetic proportional valve can be limited, thus protecting the reliability of the entire proportional valve control circuit 22. Of course, the feedback resistor unit can also include only one resistor, three resistors, or more resistors.

[0073] Continue to refer to Figure 2 The feedback module 223 also includes a fifth resistor R5 and a sixth resistor R6 connected in series. The two ends of the fifth resistor R5 and the sixth resistor R6 connected in series are respectively connected to the second end of the electromagnetic proportional valve and the second power supply VC2. At this time, the inverting input terminal of the comparator U1 is connected between the fifth resistor R5 and the sixth resistor R6, thereby limiting the voltage input to the comparator U1 and ensuring the reliability of the comparator U1.

[0074] Furthermore, the adjustment module 222 also includes a second current-limiting resistor R8 and a third current-limiting resistor R9. The second current-limiting resistor R8 is connected between the output terminal of the amplification module 221 and the base of the transistor Q1; the third current-limiting resistor R9 is connected between the collector of the transistor Q1 and the gate of the MOSFET Q2. By increasing the current-limiting resistor, the current in the circuit is limited, thereby ensuring the reliability of the entire electromagnetic proportional valve control circuit 22.

[0075] The amplification module 221 also includes a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, a first current-limiting resistor R7, and a pull-up resistor R10. The first filter capacitor C1 is connected between the positive input terminal of comparator Q1 and system ground; the second filter capacitor C2 is connected between the negative input terminal of comparator Q1 and system ground; the third filter capacitor C3 is connected between the second power supply VC2 and the positive power supply terminal of comparator Q1; the pull-up resistor R10 is connected between the output terminal of comparator Q1 and the second power supply VC2; and the first current-limiting resistor R7 is connected between the proportional valve control port and the positive input terminal of comparator Q1. In this invention, the first filter capacitor C1 and the second filter capacitor C2 can reduce the signal entering the positive and negative input terminals of comparator Q1, making the signal entering comparator Q1 smoother. The third filter capacitor C3 makes the power supply signal of comparator Q1 more stable and smooth. Furthermore, the pull-up resistor R10 can ensure that the output level of comparator Q1 is high and can increase the output drive current.

[0076] Specifically, the first current-limiting resistor R7, the second current-limiting resistor R8, and the third current-limiting resistor R9 may each include one, two, or more resistors, and the resistance values ​​of each current-limiting resistor may be equal or unequal.

[0077] The proportional valve control circuit 22 also includes a freewheeling diode D3. The cathode of the freewheeling diode D3 is connected between the first terminal of the electromagnetic proportional valve and the drain of the MOSFET Q2, and the anode is connected to system ground. When current flows through the electromagnetic proportional valve, an induced electromotive force (EMF) is generated across its terminals. When the current disappears, the induced EMF generates a reverse voltage on the components in the circuit. When the reverse voltage exceeds the reverse breakdown voltage of the components, it can damage transistors such as Q1 and Q2 in the adjustment control circuit. The proportional valve control circuit 22 of this invention adds a freewheeling diode D3, which is connected in parallel across the electromagnetic proportional valve. When the current flowing through the electromagnetic proportional valve disappears, the induced EMF generated by the electromagnetic proportional valve is dissipated through the loop formed by the freewheeling diode D3 and the electromagnetic proportional valve, thereby protecting the transistors Q1 and Q2 in the adjustment module.

[0078] Among them, for the comparators U1 in the two proportional valve control circuits 22 of the same burner 10, each can be selected as an independent comparator element, or the same comparator element can be selected. When the same comparator element is selected, there are two sets of positive input terminal, inverted input terminal, positive power supply terminal, and negative power supply terminal. When the third filter capacitor C3 is connected between the positive power supply terminal and the second power supply VC2, only one of the positive power supply terminals needs to be connected to the third filter capacitor C3.

[0079] The control center 21 can be a microcontroller; the specific model can be selected according to the needs.

[0080] Ignition control circuit 24, etc. Figure 3 As shown, transistors Q17 and Q20 are connected to the primary coil of ignition transformer T3, and the secondary coil of ignition transformer T3 is connected to diodes D22 and D29. Diodes D22 and D29 are connected to the high-voltage coil T4 of ignition mechanism 11 through discharge capacitor C27. When transistor Q17 receives the control signal output from the ignition control port, transistors Q17 and Q20 turn on, and ignition transformer T3 causes its secondary coil to periodically charge and discharge discharge capacitor C27 through diodes D22 and D29. When discharge capacitor C27 discharges to high-voltage coil T4, high voltage is generated on the secondary side of high-voltage coil T4 and discharged through air, thus realizing ignition.

[0081] The flame detection control circuit 25 includes an interconnected flame analog signal detection circuit and a flame analog-to-digital signal conversion circuit. The flame analog signal detection circuit is connected to the flame detection control port and converts the flame ionization signal of the flame detection mechanism 12 into an electrical analog signal. The flame analog-to-digital signal conversion circuit converts the electrical analog signal into the signal required by the control center 21.

[0082] The shut-off valve control circuit 23 includes a transistor Q19. The transistor Q19 is opened or closed by the signal output from the shut-off valve control port, thereby controlling the opening and closing of the shut-off valve 15 connected to the transistor Q19.

[0083] It should be noted that the specific values ​​of the capacitors and resistors mentioned above can be set according to the needs of the circuit, and the present invention does not limit this. The specific values ​​of the first power supply VC1 and the second power supply VC2 can also be set as needed. For example, in one embodiment, the value of the first power supply VC1 is selected as 30V, and the value of the second power supply VC2 is selected as 5V.

[0084] As mentioned above, the gas stove of this invention can not only achieve manual cooking, i.e., adjusting and controlling various parameters during cooking through manual touch screen display 30 at each stage of cooking, but also achieve automatic cooking through navigation recipes. When achieving automatic cooking through navigation recipes, the navigation recipes can be directly stored in the controller 20, such as the controller 20 also including a storage module storing navigation recipes. Sometimes, users wish to select a wider variety of recipes, which can be done via mobile phone, cloud, etc. In this case, the gas stove can wirelessly communicate with the mobile phone or cloud via a wireless module. During the cooking process, especially during automatic cooking, it is often necessary to obtain the temperature information inside the pot. For some smart pots, which are equipped with interconnected temperature sensors and wireless transmission modules, the gas stove can obtain the temperature information from the temperature sensors on the smart pot through the wireless module. Specifically, the controller 20 also includes a wireless module, and the control center 21 also includes a wireless signal acquisition port connected to the wireless module. The control center 21 executes corresponding controls based on the acquired wireless signals.

[0085] If the wireless signal includes temperature data, the control center 21 controls the touch screen 30 to display the temperature data;

[0086] If the wireless signal includes recipe data, the control center will display the recipe data on the control screen. Specifically, the recipe data can be the navigation recipes mentioned above.

[0087] Specifically, during automatic cooking, the cooking stages in the navigation recipe may include ideal temperatures, or users may input ideal temperatures during manual cooking. Specifically, if the touch command includes ideal temperature values ​​(including ideal temperature values ​​input directly via manual touch operation and ideal temperature values ​​obtained from the navigation recipe), the control center 21 determines the input current value of the electromagnetic proportional valve based on the ideal temperature value and the temperature information obtained through the wireless module. Based on the input current value, it outputs a PWM signal to the proportional valve control circuit to control the electromagnetic proportional valve's operation. In other words, the control center 21 can also determine the input current value of the electromagnetic proportional valve based on the ideal temperature value and the actual temperature information. Of course, it will determine the input current values ​​of the first and second electromagnetic proportional valves separately. This improves the precise control of food during the entire gas stove cooking process and enhances the taste of the cooked dishes.

[0088] When the gas stove includes multiple burners 10, the user can also determine the burner 10 to be cooked by touching the touch screen 30. Specifically, if the touch command includes a burner selection command, the control center 21 sends the control command formed by the ignition command and the firepower adjustment command to the ignition mechanism 11 and the proportional valve control circuit 22 of the corresponding burner 10 according to the burner selection command. That is, the present invention can use the same touch screen 30 to control multiple burners 10. Compared with each burner 10 corresponding to a separate touch screen 30, this method obviously saves the space of the gas stove and makes it convenient for users to operate.

[0089] Of course, the control center 30 can input values ​​for the specific firepower value, temperature information, and acquired navigation recipes in the above-mentioned firepower adjustment command into the touch display driver circuit 26 via the touch display port to control the touch display screen 30 to display this information.

[0090] A specific working process of the gas stove of the present invention is as follows: When the user inputs a start command through the touch screen 30, the control center 21 receives the touch command and controls the flame detection control circuit 25 to first detect whether there is a flame signal. If there is, it is abnormal; if not, it is normal. Under normal conditions, the ignition control circuit 24 starts working, and its high-voltage transformer T4 discharges an electric arc to the air. Then, the control center 21 controls the control circuits of each valve body (including the shut-off valve 15 and the electromagnetic proportional valve) to start working. The shut-off valve control circuit 23 opens the shut-off valve 15 to open the main gas path. The proportional valve control circuit 22 opens the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14 in turn. At this time, the flame detection control circuit 25 detects the flame signal. If there is a flame, the control center 21 controls the ignition control circuit 24 to shut off the ignition and enters the working mode based on the flame information. If no flame signal is detected after a certain period of time, the control center 21 controls the ignition control circuit 24 to shut off the ignition and controls the shut-off valve control circuit 23 to close the shut-off valve 15, and the proportional valve control circuit 22 to close the first electromagnetic proportional valve 13 and the second electromagnetic proportional valve 14. Then the above steps are repeated. If no flame is detected, the control center 21 outputs an abnormal status, which can be displayed on the touch screen.

[0091] In addition, the present invention also provides a control circuit for a gas stove with a touch screen display. This circuit can be packaged as the controller described above, specifically including the components of the controller 20 described above. Therefore, it will not be described in detail here.

[0092] Those skilled in the art will understand that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0093] It should be understood that the above embodiments are merely exemplary and not restrictive. Various obvious or equivalent modifications or substitutions that can be made by those skilled in the art regarding the above details without departing from the basic principles of the present invention will be included within the scope of the claims of the present invention.

Claims

1. A gas stove, comprising a burner, the burner including an ignition mechanism, a flame detection mechanism, an inner ring fire channel, an outer ring fire channel, a first electromagnetic proportional valve communicating with the inner ring fire channel, a second electromagnetic proportional valve communicating with the outer ring fire channel, and a shut-off valve, wherein the first electromagnetic proportional valve and the second electromagnetic proportional valve are connected to a gas supply end through the shut-off valve; characterized in that, It also includes a controller and a touch display screen; The controller includes a control center, a proportional valve control circuit corresponding to each electromagnetic proportional valve, a shut-off valve control circuit, an ignition control circuit, a flame detection control circuit, and a touch display drive circuit. The control center has a proportional valve control port, a shut-off valve control port, an ignition control port, a flame detection port, and a touch display port; Each electromagnetic proportional valve is connected to the proportional valve control port via a corresponding proportional valve control circuit. The shut-off valve is connected to the shut-off valve control port via a shut-off valve control circuit. The ignition mechanism is connected to the ignition control port via an ignition control circuit. The flame detection mechanism is connected to the flame detection port via a flame detection control circuit. The touch screen is connected to the touch display port via a touch display driver circuit. The touch display screen is used to acquire touch commands and send the touch commands to the control center; The control center is used to execute corresponding controls based on the touch commands: If the touch command includes an ignition command, the control center controls the shut-off valve to open according to the ignition command and controls the ignition mechanism to ignite. If the touch command includes a firepower adjustment command, the control center determines the input current value of the first electromagnetic proportional valve and the second electromagnetic proportional valve according to the firepower adjustment command, and outputs a PWM signal to the proportional valve control port corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on the respective input current value. The proportional valve control circuit includes an amplification module, an adjustment module, and a feedback module. The adjustment module includes a transistor, a MOSFET, a Zener diode unit, and a protection resistor unit. The protection resistor unit is connected to both ends of the Zener diode unit, and also to the source and gate of the MOSFET. The end connected to the source is also connected to a first power supply, and the end connected to the gate is connected to the collector of the transistor. The drain of the MOSFET is connected to the first terminal of the electromagnetic proportional valve. The emitter of the transistor is connected to system ground, and the base is connected to the output terminal of the amplification module. The amplification module includes a comparator, whose positive power supply terminal is connected to a second power supply, its negative power supply terminal is connected to system ground, its positive input terminal is connected to the control port of the electromagnetic proportional valve, and its inverting input terminal is connected to the second terminal of the proportional valve. The feedback module includes a feedback resistor unit, whose two ends are connected to the second terminal of the electromagnetic proportional valve and system ground, respectively.

2. The gas stove according to claim 1, characterized in that, The Zener diode unit includes a first Zener diode and a second Zener diode. The positive terminal of the first Zener diode is connected to the positive terminal of the second Zener diode, and the negative terminals of the two are respectively connected to the two ends of the protection resistor unit.

3. The gas stove according to claim 1, characterized in that, The protection resistor unit includes a first resistor and a second resistor connected in parallel.

4. The gas stove according to claim 1, characterized in that, The feedback resistor unit includes a third resistor and a fourth resistor connected in series.

5. The gas stove according to claim 1, characterized in that, The feedback module also includes a fifth resistor and a sixth resistor connected in series. The two ends of the fifth resistor and the sixth resistor connected in series are respectively connected to the second end of the electromagnetic proportional valve and the second power supply. The inverting input of the comparator is connected between the fifth resistor and the sixth resistor.

6. The gas stove according to claim 1, characterized in that, The amplification module further includes a first filter capacitor, a second filter capacitor, a third filter capacitor, a first current-limiting resistor, and a pull-up resistor. The first filter capacitor is connected between the positive input terminal of the comparator and system ground; the second filter capacitor is connected between the negative input terminal of the comparator and system ground; the third filter capacitor is connected between the second power supply and the positive power supply terminal of the comparator; the pull-up resistor is connected between the output terminal of the comparator and the second power supply; and the first current-limiting resistor is connected between the proportional valve control terminal and the positive input terminal of the comparator.

7. The gas stove according to claim 1, characterized in that, The adjustment module further includes a second current-limiting resistor and a third current-limiting resistor. The second current-limiting resistor is connected between the output terminal of the amplification module and the base of the transistor; the third current-limiting resistor is connected between the collector of the transistor and the gate of the MOS transistor.

8. The gas stove according to claim 1, characterized in that, The proportional valve control circuit also includes a freewheeling diode, the negative terminal of which is connected between the first end of the electromagnetic proportional valve and the drain of the MOS transistor, and the positive terminal is connected to system ground.

9. The gas stove according to claim 1, characterized in that, The controller further includes a wireless module, and the control center further includes a wireless signal acquisition port connected to the wireless module. The control center performs corresponding control based on the acquired wireless signal. If the wireless signal includes temperature data, the control center controls the touch screen to display the temperature data; If the wireless signal includes recipe data, the control center controls the display screen to show the recipe data.

10. The gas stove according to claim 9, characterized in that, If the touch command includes an ideal temperature value, the control center also determines the input current value of the electromagnetic proportional valve based on the ideal temperature value and the temperature information obtained through the wireless module, and outputs a PWM signal to the proportional valve control circuit based on the input current value to control the operation of the electromagnetic proportional valve.

11. The gas stove according to any one of claims 1-10, characterized in that, The gas stove includes multiple burners. If the touch control command includes a burner selection command, the control center sends the control command formed by the ignition command and the firepower adjustment command to the ignition mechanism and proportional valve control circuit of the corresponding burner according to the burner selection command.

12. A control circuit for a gas stove with a touch screen display, the gas stove comprising a burner, the burner comprising an ignition mechanism, a flame detection mechanism, an inner ring fire channel, an outer ring fire channel, a first electromagnetic proportional valve communicating with the inner ring fire channel, a second electromagnetic proportional valve communicating with the outer ring fire channel, and a shut-off valve, the first electromagnetic proportional valve and the second electromagnetic proportional valve being connected to a gas supply end through the shut-off valve; characterized in that, The control circuit includes: The control center has a proportional valve control port, a shut-off valve control port, an ignition control port, a flame detection port, and a touch display port; A proportional valve control circuit corresponding to each electromagnetic proportional valve is connected to the corresponding proportional valve control port for controlling each electromagnetic proportional valve. A shut-off valve control circuit is connected to the shut-off valve control port to control the opening and closing of the shut-off valve; A flame detection control circuit is connected to the flame detection port to transmit the flame detection results to the control center. A touch display driver circuit is connected to the touch display port to control the operation of the touch display screen and transmit the touch commands of the touch display screen to the control center; The control center is used to execute corresponding controls based on the touch commands: If the touch command includes an ignition command, the control center controls the shut-off valve to open according to the ignition command and controls the ignition mechanism to ignite. If the touch command includes a firepower adjustment command, the control center determines the current value of the proportional valve based on the firepower adjustment command, and outputs a PWM signal to the proportional valve control ports corresponding to the first electromagnetic proportional valve and the second electromagnetic proportional valve based on the current value.

13. The control circuit according to claim 12, characterized in that, The proportional valve control circuit includes: The adjustment module includes a transistor, a MOSFET, a Zener diode unit, and a protection resistor unit. The two ends of the protection resistor unit are connected to the two ends of the Zener diode unit, and also to the source and gate of the MOSFET. One end connected to the source is connected to a first power supply, and the other end connected to the gate is connected to the collector of the transistor. The drain of the MOSFET is connected to the first terminal of a proportional valve. The emitter of the transistor is grounded, and the base is connected to the output terminal of the amplification power supply. The amplification module includes a comparator, wherein the positive power supply terminal of the comparator is connected to a second power supply, the negative power supply terminal is connected to system ground, the positive input terminal is connected to the control port of the proportional valve, and the inverted input terminal is connected to the second end of the proportional valve. The feedback module includes a feedback resistor unit, the two ends of which are respectively connected to the second end of the proportional valve and the system ground; A freewheeling diode, wherein the negative terminal of the freewheeling diode is connected between the first terminal of the proportional valve and the drain of the MOS transistor, and the positive terminal is connected to system ground.

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