Control circuit and control method of gas stove

Abstract

The invention provides a control circuit and a control method of a gas stove. The control circuit comprises a power supply module, a power storage module, an electromagnetic valve, a valve closing module and a power failure follow current module, two ends of the electromagnetic valve are electrically connected with the power storage module and the power supply module respectively; the valve closing module comprises a first switch and a power supply control module, and the first switch is arranged on a connecting line between the electromagnetic valve and the power storage module; one end of the power control module is connected with the first switch and the power storage module, and the other end is connected with the power supply module; the input end of the power-down follow current module is connected with the power supply module and the power supply control module, and the output end of the power-down follow current module is connected with the electromagnetic valve. The control circuit can enable the power-down follow current circuit to be automatically conducted when the power supply module is powered off abnormally, so that the power-down follow current circuit, the power storage module, the first switch and the electromagnetic valve form an abnormal valve closing loop, the electromagnetic valve is automatically closed through energy stored by the power storage module, and then automatic flameout protection of the gas stove is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of gas stoves, and in particular to a control circuit and a control method for a gas stove. Background Art

[0002] With the development of science and technology, the intelligence level of household appliances is increasing day by day. Gas stoves are also gradually transitioning from traditional mechanical control to automation and intelligence. Currently, gas stoves with a timing function are gradually gaining popularity on the market. These stoves can automatically turn off the flame after the scheduled time is reached. However, these gas stoves have certain safety risks during use. When power supply abnormalities occur, such as power outages or battery depletion, the gas stove may lose the function of automatically shutting off the gas to extinguish the flame. As a result, the stove cannot automatically shut off the flame even after the scheduled time has expired, which may pose a risk of dry burning. Therefore, there is an urgent need for a control circuit that can automatically shut off the flame when the gas stove loses power abnormally to solve the above technical problems. Summary of the Invention

[0003] In order to solve the technical problems in the background technology, this application proposes a control circuit and control method for a gas stove, so that the gas stove can automatically close the valve and extinguish the flame in the event of an abnormal power outage, avoiding the safety hazard caused by the gas stove being unable to automatically extinguish the flame when the timer is reached.

[0004] On the one hand, an embodiment of the present application provides a control circuit for a gas stove, the control circuit including a power supply module, a power storage module, a solenoid valve, a valve shut-off module, and a power-off continuous flow module; the two ends of the solenoid valve are electrically connected to the power storage module and the power supply module, respectively; the valve shut-off module includes a first switch and a power control module, the first switch being arranged on a connection line between the solenoid valve and the power storage module; one end of the power control module is connected to the first switch and the power storage module, and the other end is connected to the power supply module; the input end of the power-off continuous flow module is connected to the power supply module and the power control module, respectively, and the output end of the power-off continuous flow module is connected to the solenoid valve; The power control module is used to drive the power-off freewheeling module to be cut off together with the power supply module when the power supply module is in the power supply state, and simultaneously control the state of the first switch so that the power storage module, the first switch, the solenoid valve and the power supply module form a normal valve closing circuit; The power-off freewheeling module is used to automatically turn on when the power supply module is in a power-off state, and form an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

[0005] Furthermore, the power-off freewheeling module includes a transistor, an operational amplifier and a capacitor-resistor circuit; The non-inverting input terminal of the operational amplifier is connected to the power supply module, the capacitor-resistor circuit is provided on the connection line between the non-inverting input terminal and the power supply module, and the inverting input terminal of the operational amplifier is connected to the power control module; The output end of the operational amplifier is connected to the base of the transistor, the collector of the transistor is connected to the connection line between the solenoid valve and the power supply module, and the emitter of the transistor is grounded.

[0006] Furthermore, the capacitor-resistor circuit includes a first resistor and a first capacitor; The first resistor is connected in series between the non-inverting input terminal and the power supply module; One end of the first capacitor is connected to the connection line between the non-inverting input terminal and the first resistor, and the other end is connected to the negative power supply terminal of the operational amplifier.

[0007] Furthermore, the power-off freewheeling module further includes a diode, a second resistor, a third resistor, a second capacitor and a third capacitor; The second capacitor is connected to the cathode of the diode and the positive power supply terminal of the operational amplifier respectively, and the anode of the diode is connected to the power control module and the inverting input terminal respectively; The third resistor is provided on the connection line between the output terminal of the operational amplifier and the transistor, and the third capacitor and the third resistor are connected in parallel; One end of the second resistor is connected to the base of the transistor, and the other end is connected to the emitter of the transistor.

[0008] Furthermore, the power control module includes a power module and a controller; The controller is connected to the first switch, the power supply module and the power supply module respectively; The power supply module is respectively connected to the power storage module, the input end of the power-off continuous flow module, and the power supply module. The power supply module is used to convert the power provided by the power supply module into a first power supply and a second power supply. The first power supply is used to power the controller and the power-off continuous flow module, and the second power supply is used to charge the power storage module.

[0009] Furthermore, the power-off freewheeling module further includes a second switch, which is provided on the connection line between the power control module and the power supply module, and is linked to the operation switch of the gas stove; The second switch is a mechanical switch.

[0010] Furthermore, when the power supply module is a battery, the voltage of the first power supply and the voltage of the second power supply are both greater than the voltage of the battery.

[0011] On the other hand, an embodiment of the present application further provides a method for controlling a gas stove, which is implemented by the control circuit of the gas stove described above. The method includes: When the power supply module is in a power supply state and the gas stove is in a normal working state, power is supplied to the power control module through the power supply module, so that the power control module and the power supply module jointly drive the power-off freewheeling module to be cut off, and the power control module charges the power storage module, and when receiving a valve closing signal, the power control module drives the first switch to be turned on, thereby forming a normal valve closing circuit consisting of the power storage module, the first switch, the solenoid valve and the power supply module, so that the solenoid valve is closed; When the power supply module is in a power-off state and the gas stove is in a normal working state, the power-off freewheeling module is controlled to be automatically turned on, forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

[0012] Furthermore, the power-off freewheeling module includes a transistor, an operational amplifier, and a capacitor-resistor circuit; when the power supply module is in a power-off state and the gas stove is in a normal working state, the power-off freewheeling module is controlled to automatically turn on, forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove, including: When the power supply module is in a power-off state and the gas stove is in a normal working state, the energy stored in the capacitor-resistor circuit drives the operational amplifier to output a high level, so that the transistor is automatically turned on, thereby forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so that the energy stored in the power storage module is used to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

[0013] Furthermore, the power-off freewheeling module further includes a second switch, which is provided on a connection line between the controller and the power module, and is linked to an operating switch of the gas stove; the method further includes: In response to the closing signal of the operating switch, the second switch is controlled to be closed synchronously, so that the power-off freewheeling module and the power control module are powered off, thereby realizing power-off protection of the power supply module.

[0014] On the other hand, an embodiment of the present application further provides a gas stove, comprising the above-mentioned control circuit of the gas stove.

[0015] On the other hand, an embodiment of the present application also provides an electronic device, which includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement a gas stove control method as described above.

[0016] On the other hand, an embodiment of the present application also provides a computer-readable storage medium, which stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by a processor to implement a gas stove control method as described above.

[0017] On the other hand, an embodiment of the present application further provides a computer program product, which implements the above-mentioned gas stove control method when the computer program is executed by a processor.

[0018] The embodiment of the present application provides a control circuit and control method for a gas stove, wherein the control circuit includes a power supply module, a power storage module, a solenoid valve, a valve closing module and a power-off continuous flow module; the two ends of the solenoid valve are electrically connected to the power storage module and the power supply module respectively; the valve closing module includes a first switch and a power control module, and the first switch is arranged on the connection line between the solenoid valve and the power storage module; one end of the power control module is connected to the first switch and the power storage module, and the other end is connected to the power supply module; the input end of the power-off continuous flow module is connected to the power supply module and the power control module respectively, and the output end of the power-off continuous flow module is connected to the solenoid valve; the power control module is used to turn on the power supply module when the power supply module is in the power supply state When the power supply module is in a power-off state, the power supply module and the power supply module jointly drive the power-off continuous flow module to be cut off, and simultaneously control the state of the first switch, so that the power storage module, the first switch, the solenoid valve and the power supply module form a normal valve closing circuit; the power control module is also used to jointly drive the power-off continuous flow module to be cut off with the power supply module; the power-off continuous flow module is used to automatically turn on when the power supply module is in a power-off state, and form an abnormal valve closing circuit with the power storage module, the first switch and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove. The present invention solves the problem that the gas stove cannot automatically turn off when the timing time is reached, and can improve the safety of using the gas stove with a timing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic diagram of a control circuit of a gas stove provided in an embodiment of the present application.

[0021] Figure 2 This is a schematic diagram of a normal valve closing circuit provided in an embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of an abnormal valve closing circuit provided in an embodiment of the present application.

[0023] Figure 4 This is a schematic diagram of a control circuit of a gas stove provided in an embodiment of the present application.

[0024] Figure 5 This is a schematic diagram of another abnormal valve closing circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] It should be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0027] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0028] Prior art gas stoves with a timing function automatically shut off the solenoid valve when the usage time reaches the set time, thereby automatically shutting off the flame. However, regardless of whether the gas stove uses mains electricity or batteries as its power source, abnormal power outages, such as power outages or dead batteries, may occur. In such cases, the automatic timing function will fail, preventing the stove from automatically shutting off when the set time is reached. This can lead to safety hazards such as dry burning. To address this technical problem, embodiments of the present application provide a control circuit and control method for a gas stove.

[0029] See also Figure 1 , Figure 1A control circuit of a gas stove provided in an embodiment of the present application includes a power supply module, a power storage module, a solenoid valve, a valve closing module, and a power-off freewheeling module; The two ends of the solenoid valve are electrically connected to the power storage module and the power supply module respectively; the valve closing module includes a first switch and a power control module, and the first switch is arranged on the connection line between the solenoid valve and the power storage module; one end of the power control module is connected to the first switch and the power storage module, and the other end is connected to the power supply module; the input end of the power-off freewheeling module is connected to the power supply module and the power control module respectively, and the output end of the power-off freewheeling module is connected to the solenoid valve; The power control module is used to, when the power supply module is in the power supply state, jointly drive the power-off freewheeling module to be cut off with the power supply module, and simultaneously control the state of the first switch so that the power storage module, the first switch, the solenoid valve and the power supply module form a normal valve closing circuit; the power control module is also used to jointly drive the power-off freewheeling module to be cut off with the power supply module; The power-off freewheeling module is used to automatically turn on when the power supply module is in a power-off state, and form an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

[0030] In an embodiment of the present application, the power supply module is used to provide power to the entire control circuit, and the power storage module is used to store power when the power supply module is in a power supply state, thereby providing power for closing the solenoid valve when the power supply module is powered off.

[0031] The valve closing module includes a first switch and a power control module. The power control module can only operate when the power supply module is normal. It is not only used to convert the energy output by the power supply module to charge the power storage module when the power supply module is normal; it also controls the state of the first switch according to the timing time of the timing function when the power supply module is normal, so that when the timing time is reached, the following is formed: Figure 2 The normal valve closing circuit shown by the power storage module, the first switch, the solenoid valve and the power supply module is designed to automatically close the valve and extinguish the flame when the power supply module is normal. Furthermore, the power control module and the power supply module each provide an input voltage for the power-off return circuit. The power-off return circuit is cut off by utilizing the magnitude relationship between the two input voltages. That is, when the power supply module is in the power supply state, the current of the solenoid valve does not pass through the power-off return circuit during the closing process. Figure 2 The normal circuit shown is equivalent to an open circuit in the power supply module when the power supply module loses power abnormally, and the valve closing circuit cannot be formed, so the gas stove cannot automatically close the valve and extinguish the flame.

[0032] Therefore, a power-off continuous flow module is added. When the power supply module loses power abnormally, that is, is in a power-off state, the power control module fails, so that the first switch is in a normally closed state. Therefore, the power-off continuous flow module is automatically turned on, and together with the power storage module, the first switch, and the solenoid valve, a circuit is formed as shown below. Figure 3 The abnormal valve closing shown is back, which is the electricity stored in the power storage module to drive the solenoid valve to close, so that when the power supply module loses power abnormally, the solenoid valve will automatically close synchronously, thereby automatically turning off the gas stove.

[0033] Optionally, the power storage module may be a capacitor, in particular, Figure 4 The capacitor shown is polarized, but it can also be other components with power storage function.

[0034] The embodiment of the present application sets up a power storage module and a power-off continuous flow module, connects the power storage module in series with the power supply module, and uses the power control module and the power supply module to cut off the power-off continuous flow module when the power supply module is normal, so that the power-off continuous flow module does not participate in the valve closing circuit when the power supply is normal, avoiding interference with normal fixed functions. However, when the power supply module is abnormal, the power-off continuous flow module will be turned on immediately, and cooperate with the power storage module to form an abnormal valve closing circuit, so that the solenoid valve of the gas stove is closed synchronously when the power is abnormally cut off, preventing dry burning, so as to achieve flameout protection when the power supply is abnormally cut off.

[0035] As an optional implementation, the power control module includes a power module and a controller; The controller is connected to the first switch, the power supply module and the power supply module respectively; The power supply module is respectively connected to the power storage module, the input end of the power-off continuous flow module, and the power supply module. The power supply module is used to convert the power provided by the power supply module into a first power supply and a second power supply. The first power supply is used to power the controller and the power-off continuous flow module, and the second power supply is used to charge the power storage module.

[0036] In the embodiment of this application, Figure 4 As shown, the power control module includes a controller and a first switch. The power module is connected to the inverting input terminal 3 of the operational amplifier U10, the controller, and the power supply module. When the power supply module is normal, the power module converts the power output of the power supply into a first power supply V1 and a second power supply V2. The first power supply V1 is used to power the controller and the power-off freewheeling module, and the second power supply V2 is used to power the power storage module. The first switch is set at the solenoid valve (i.e. Figure 4 The gas solenoid valve shown in Figure 4On the connection line between the capacitor EC10 shown, one end of the controller is connected to the first switch, and the other end is connected to the connection line between the power supply module and the power supply module.

[0037] Optionally, the controller may be an MCU controller, Microcontroller Unit.

[0038] The following describes the specific functions of the power control module: When the power supply module is in the power supply state and the gas stove is in the working state, the power supply module charges the power supply module, the power supply module outputs the first power supply to power the control module respectively, and the second power supply output by the power supply module charges the power storage module. After the MCU controller is powered on, it controls the first switch to be in the normally open state. At the same time, the MCU controller will determine that the cooker is working according to the operating state of the gas stove, receive and run the input of the user's timing signal. When the operating time reaches the timing time, the first switch is turned on under the control of the MCU controller, forming the following Figure 2 At the same time, the first power supply output by the power module also supplies power to the power-off freewheeling circuit.

[0039] The embodiment of the present application converts the energy provided by the power supply module into a charging power supply for the power storage module and an input power supply for the power-off continuous flow module through the power supply module, and uses a controller to control the state of the first switch, thereby charging the power storage module to form a preliminary valve-closing power supply. This not only realizes the intelligent control of the gas stove but also lays the foundation for the formation of a valve-closing circuit when the power supply module abnormally loses power.

[0040] As an optional embodiment, the power-off freewheeling module includes a transistor Q10, an operational amplifier U10 and a capacitor-resistor circuit; the non-inverting input terminal 1 of the operational amplifier U10 is connected to the power supply module, the capacitor-resistor circuit is arranged on the connection line between the non-inverting input terminal and the power supply module, and the inverting input terminal 3 of the operational amplifier U10 is connected to the power control module; the output terminal 4 of the operational amplifier U10 is connected to the base of the transistor Q10, the collector of the transistor Q10 is connected to the connection line between the solenoid valve and the power supply module, and the emitter of the transistor Q10 is grounded.

[0041] As an optional implementation, the capacitor-resistor circuit includes a first resistor and a first capacitor; The first resistor is connected in series between the non-inverting input terminal 1 and the power supply module; One end of the first capacitor is connected to the connection line between the non-inverting input terminal 1 and the first resistor, and the other end is connected to the negative power supply terminal 2 of the operational amplifier U10.

[0042] like Figure 4 As shown, in an embodiment of the present application, the power-off freewheeling module includes a transistor Q10, an operational amplifier U10, and a capacitor-resistor circuit (RC circuit). The capacitor-resistor circuit is provided at the non-inverting input terminal 1 of the operational amplifier U10. Specifically, the capacitor-resistor circuit includes a first resistor R10 and a first capacitor C10. The non-inverting input terminal 1 of the operational amplifier is connected to the power supply module. The first resistor R10 is provided on the connection line between the non-inverting input terminal 1 and the power supply module. One end of the first capacitor C10 is connected to the connection line between the first resistor R10 and the non-inverting input terminal 1, and the other end of the first capacitor C10 is connected to the negative power supply terminal 2 of the operational amplifier, and the negative power supply terminal 2 of the operational amplifier U10 is grounded. The inverting input terminal 3 of the operational amplifier U10 is connected to the power control module, so that the power control module can be used to provide an input voltage for the power-off freewheeling module.

[0043] The operational amplifier U10 is connected in series with the transistor Q10. Specifically, the output terminal 4 of the operational amplifier U10 is connected to the base of the transistor Q10, the emitter of the transistor Q10 is grounded, and the collector of the transistor Q10 is connected to the connection line between the solenoid valve and the power supply module, so that the valve closing circuit can be connected when the power supply module loses power abnormally.

[0044] The working principle of the power-off freewheeling module is as follows: when the power supply module is normal, the power supply control module can convert the power provided by the power supply module and generate a first power supply or a first voltage to be input to the inverting input terminal 3 of the operational amplifier U10, and control the first power supply or the first voltage to be greater than the input voltage of the non-inverting input terminal 1 of the operational amplifier U10. Since the input voltage of the inverting input terminal 3 is greater than the input voltage of the non-inverting input terminal 1, the output terminal 4 of the operational amplifier U10 outputs a 0 level, so that the transistor Q10 is cut off, ensuring that the battery current does not pass through the transistor Q10.

[0045] When the power supply module loses power, the input voltage of the inverting input terminal 3 drops to 0 level. The capacitor C10 connected to the non-inverting input terminal 1 of U10 is connected to the resistor R10, and the electric energy discharge speed of C10 is slow, resulting in the level of the non-inverting input terminal 1 of U10 being greater than the level of the inverting input terminal 3 (at this time the level of the inverting input terminal = 0V). The op amp outputs a high level to drive the transistor Q10 to turn on, forming an abnormal valve closing circuit for the solenoid valve.

[0046] Preferably, the time constant of the RC circuit is greater than or equal to 100 mS.

[0047] In the embodiment of the present application, the power-off continuous flow module is configured as a transistor Q10, an operational amplifier U10 and a capacitor-resistor circuit, so that the characteristic that different sizes of the input signals of the operational amplifier bring about different output results can be utilized, the transistor can be controlled to be cut off or turned on, and the discharge characteristics of the RC circuit after the power is disconnected can be utilized to make the output voltage level greater than 0, so that the transistor is turned on, and the entire power-off continuous flow module is connected to the valve closing circuit, realizing automatic conduction of the power-off continuous flow module when the power supply module abnormally loses power, thereby forming an abnormal valve closing circuit, causing the solenoid valve to automatically close, and preventing safety hazards such as dry burning.

[0048] As an optional implementation, the power-off freewheeling module further includes a diode, a second resistor, a third resistor, a second capacitor and a third capacitor; The second capacitor is connected to the cathode of the diode and the positive power supply terminal of the operational amplifier respectively, and the anode of the diode is connected to the power control module and the inverting input terminal respectively; The third resistor is provided on the connection line between the output terminal of the operational amplifier and the transistor, and the third capacitor and the third resistor are connected in parallel; One end of the second resistor is connected to the base of the transistor, and the other end is connected to the emitter of the transistor.

[0049] In the embodiment of this application, Figure 4 As shown, the power-off freewheeling module further includes a diode D10, a second resistor R11, a third resistor R12, a second capacitor C11 and a third capacitor C12.

[0050] Specifically, one end of the second capacitor C11 is connected to the positive power supply terminal 5 of the operational amplifier U10, and the other end is grounded. The cathode of the diode D10 is connected to the connection line between the second capacitor C11 and the positive power supply terminal 5 of the operational amplifier U10, and the anode of the diode D10 is connected to the power module in the power control module and the inverting input terminal 3 of the operational amplifier U10. The function of the diode D10 is to store the operating power supply of the operational amplifier U10 (i.e., the power output by the power control module) in the second capacitor C11 through the diode D10. This allows the energy stored in the second capacitor C11 to maintain the conduction of the transistor Q10 by the operational amplifier U10 when the power supply module loses power.

[0051] The third resistor R12 is provided between the output terminal 4 of the operational amplifier U10 and the base of the transistor Q10. The third capacitor C12 is connected in parallel with the third resistor R12. The third capacitor C12 is used for storing the circuit, thereby accelerating the conduction of the transistor Q10. The third resistor R12 is used to limit the current flowing from the output terminal 4 of the operational amplifier U10 to the transistor Q10, preventing the transistor from being damaged by overcurrent due to excessive current, thereby improving the stability and dynamic response of the circuit.

[0052] One end of the second resistor R11 is connected to the connection line between the third resistor R12 and the base of the transistor Q10, and the other end is arranged on the connection line between the emitter of the transistor Q10 and the ground line. The second resistor R11 is used to form a voltage divider network with the third resistor R12 to provide a stable bias voltage for the base of the transistor Q10. It is also used to limit the base current to prevent excessive base current from damaging the transistor Q10. It is also used to provide a feedback path for the base current, thereby stabilizing the operating state of the transistor Q10. It can also serve as the emitter resistor of the emitter of the transistor Q10, providing negative feedback to stabilize the transistor's static operating point, thereby improving the stability and dynamic response of the circuit.

[0053] The embodiment of the present application provides a diode D10, a second resistor R11, a third resistor R12, a second capacitor C11 and a third capacitor C12 in the power-off freewheeling circuit, which can not only provide the power to maintain the operational amplifier U10 to drive the transistor Q10 to be turned on when the power supply module loses power, but also play the role of voltage division and acceleration, thereby improving the circuit stability of the power-off freewheeling circuit, thereby ensuring the circuit stability of the abnormal valve closing loop when the power supply module loses power abnormally.

[0054] As an optional implementation, when the power supply module is a battery, the voltage of the first power supply and the voltage of the second power supply are both greater than the voltage of the battery.

[0055] In an embodiment of the present application, when the above-mentioned power supply module is a battery, in order to ensure that the transistor Q10 is cut off when the power supply module is normal, it is necessary to satisfy the level of the operational amplifier U10 non-inverting input terminal 1 is less than the level of the operational amplifier U10 reverse input terminal 3, thereby making the voltage of the first power supply greater than the voltage of the battery.

[0056] Furthermore, when the battery is normally powered, the battery is part of the normal valve closing circuit, and closing the solenoid valve requires current, so the voltage of the second power supply needs to be set to be greater than the voltage of the battery. Specifically, the solenoid valve is a device that relies on electromagnetic force to control the opening and closing of the valve. When the solenoid valve needs to be closed, sufficient voltage is required to drive the electromagnetic coil inside it to generate sufficient magnetic field to overcome the reaction force of the spring and other factors, thereby closing the valve. If the voltage of the second power supply is less than the voltage of the battery, that is, Figure 4The V2 shown is less than the battery voltage of 3.0V. During the battery discharge process, the battery voltage will gradually decrease. At this time, V2 is not enough to compensate for the drop in battery voltage, and the solenoid valve may not be able to obtain sufficient voltage to close reliably. For example, if the battery discharge voltage drops to 3V, and the second power supply V2 is only 2.5V, the solenoid valve may not work properly. Therefore, the energy storage module is not only used to provide the solenoid valve with valve closing current when the battery fails, but also setting the voltage of the second power supply to be greater than the battery voltage can ensure that when the battery voltage drops, the energy storage module can replenish enough energy so that the solenoid valve can obtain sufficient voltage to close under any circumstances. Setting the first voltage to be greater than the battery voltage can ensure that when the battery is in a normal power supply state, the power-off continuous flow module is cut off, thereby separating it from the normal valve closing circuit to prevent interference with the normal valve closing circuit.

[0057] Optionally, the voltage of the second power supply is greater than or equal to the voltage of the first power supply, and the circuits of the first power supply and the second power supply are independent. This is to ensure that when the power supply module is abnormal, the electric energy in the power storage module will not flow to other loads except the abnormal valve closing circuit.

[0058] Optionally, when the power supply module is powered by mains electricity, the power supply module is provided with an AD / DC converter, or the power supply module is an AD / DC converter, which is used to convert alternating current (AC) into direct current (DC). The output power of the direct current (DC) includes a power supply for the power supply module, a first power supply (which can be 5V), and a second power supply (which can be a 5V power supply or other power supply, generally not exceeding 12VDC). The power supply for the power supply module serves as the input signal power supply for the non-inverting input of the operational amplifier and the signal power supply for the control module's start-up input. The first power supply serves as the input power supply for the control module and the inverting input of the operational amplifier. The second power supply serves as the charging power supply for the power storage module.

[0059] Although the above-mentioned control circuit realizes the problem that the gas stove can automatically shut down the valve when the power supply module loses power abnormally, each time the gas stove is turned on or off, the power supply module will cause leakage due to the existence of the power-off freewheeling circuit, thereby resulting in waste of electric energy or reduction of the battery life and life of the power supply module. Therefore, the power-off freewheeling module provided in the embodiment of the present application also includes a second switch, which is arranged on the connection line between the controller and the power supply module, and the second switch is linked to the operation switch of the gas stove; the second switch is a mechanical switch.

[0060] For example, Figure 1As shown, a second switch is also provided in the power-off continuous flow module, and the second switch is a mechanical switch, and is synchronously linked with the operation switch in the operation panel of the gas stove. Generally, the operation switch is a knob. When the operation switch is turned on, the second switch is turned on. When the operation switch is turned off, the second switch is disconnected. In this way, the power-off continuous flow module and the power supply module can be separated, and the problem that each time the gas stove is turned on or off, the power supply module will cause leakage of the power supply module due to the existence of the power-off continuous flow circuit, thereby causing waste of electric energy or reduction of the battery life and life of the power supply module. The embodiment of the present application achieves an improvement in the battery life and life of the power supply module and saves energy by setting a mechanical switch synchronized with the operation switch.

[0061] Specifically, such as Figure 4 As shown, the power supply module is a battery as an example for explanation, one end of the second switch SW2 is connected to the positive electrode of the battery, that is, Figure 4 The other end is connected to the collector of the electromagnetic valve freewheeling circuit Q10. The second switch SW2 is synchronously linked with the operating switch on the gas stove's operating panel. When the gas stove is in operation, that is, when the operating switch is turned on, the second switch SW2 is in the normally closed state. At this time, if the gas stove has a scheduled shutdown task and is left unattended, if the battery is abnormally powered off, the second switch SW2 will also be in the abnormal valve closing circuit, such as Figure 5 As shown; when the operating switch is turned off, the second switch SW2 is disconnected and is in a normally open state, so that the power-off freewheeling circuit is separated from the battery, solving the problem of battery leakage caused by the existence of the loop circuit each time the stove is turned on and off, thereby ensuring the battery life and service life.

[0062] It should be noted that Figure 4 The above embodiments are described with the power supply module being a battery, but the power supply module is not limited to a battery.

[0063] Optionally, the embodiment of the present application does not impose any specific restrictions on the parameter range of components such as capacitors and resistors in the control circuit, as long as you can ensure that the high-level signal output by the output terminal 4 of the operational amplifier U10 is maintained for 10mS~100mS.

[0064] On the other hand, an embodiment of the present application further provides a method for controlling a gas stove, which is characterized by being implemented by a control circuit of the gas stove provided in an embodiment of the present application, and comprising: When the power supply module is in a power supply state and the gas stove is in a normal working state, power is supplied to the power control module through the power supply module, so that the power control module and the power supply module jointly drive the power-off freewheeling module to be cut off, and the power control module charges the power storage module, and when receiving a valve closing signal, the power control module drives the first switch to be turned on, thereby forming a normal valve closing circuit consisting of the power storage module, the first switch, the solenoid valve and the power supply module, so that the solenoid valve is closed; When the power supply module is in a power-off state and the gas stove is in a normal working state, the power-off freewheeling module is controlled to be automatically turned on, forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

[0065] During the implementation of this application, Figure 1 As shown, when the power supply module is in the power supply state and the gas stove is in normal working state, the energy output by the power supply module is output to two power supplies or two voltages through the power control module. One of the power supplies is used to charge the power storage module and store the energy in the power storage module to form a standby power supply for closing the valve; the functions of the other power supply include: (1) after the power control module is powered on, the first switch is controlled to be in the normally open state when the gas stove is in the working state, and the timing signal is received and run at the same time. When the timing time is reached, the first switch is turned on under the control of the power control module, thereby forming a valve as shown in FIG. Figure 2 (2) The power is output to the power-off continuous flow module. At this time, the power-off continuous flow module is controlled to be cut off under the joint drive of the power control module and the power supply module, and no current is output. However, when the power supply module loses power, the power supply module is open, and the normal valve closing circuit can no longer form a loop, and the gas stove cannot automatically shut down the valve and extinguish the flame.

[0066] At this time, the power supply module is in an open circuit state, the power control module fails, the first switch is in a normally closed state, and the power-off freewheeling module is used to automatically turn on when the power supply module is in an open circuit state, forming a Figure 3 The abnormal valve closing circuit is shown, and the power stored in the power storage module is sufficient to complete the valve closing current required by the abnormal valve closing circuit.

[0067] The control method provided in the embodiment of the present application ensures that when a gas stove has an abnormal power supply module, the power-off continuous flow module will be immediately turned on, and work together with the power storage module to form an abnormal valve closing circuit, so that the solenoid valve of the gas stove will be closed synchronously at the same time as the abnormal power failure, preventing dry burning and realizing flameout protection when the power supply fails abnormally.

[0068] As an optional embodiment, the power-off freewheeling module includes a transistor, an operational amplifier, and a capacitor-resistor circuit; when the power supply module is in a power-off state and the gas stove is in a normal working state, the power-off freewheeling module is controlled to automatically turn on, forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove, including: When the power supply module is in a power-off state and the gas stove is in a normal working state, the energy stored in the capacitor-resistor circuit drives the operational amplifier to output a high level, so that the transistor is automatically turned on, thereby forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so that the energy stored in the power storage module is used to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

[0069] See Figure 4 The specific working principle of the power-off freewheeling module is further described below. It should be noted that the power supply module is described as a battery, but the specific scope of the power supply module is not limited. It can be AC ​​power, battery, etc.

[0070] When the power supply state is in the power supply state, the battery is connected to the inverting input terminal 3 of the operational amplifier U10 through the RC circuit. At this time, since the voltage of the first power supply is greater than the voltage of the battery, that is, the input voltage of the non-inverting input terminal 1 of the operational amplifier U10 is less than the input voltage of the inverting input terminal 3, the output terminal 4 of the operational amplifier U10 outputs a 0V level, so that the transistor Q10 is cut off, ensuring that the battery current will not pass through the transistor Q10, so that the entire power-off freewheeling circuit is cut off.

[0071] When the battery loses power abnormally, the first power supply drops rapidly to 0V. At this time, the first capacitor C10 connected to the non-inverting input terminal 1 of the operational amplifier U10 is connected to the first resistor R10, so the discharge speed of the first capacitor C10 is slow, making the input voltage of the non-inverting input terminal 1 of the operational amplifier U10 greater than the input voltage of the inverting input terminal 3 (the level of the inverting input terminal = 0V at this time), so that the output terminal of the operational amplifier U10 outputs a high level and drives the transistor Q10 to conduct, forming the following Figure 3 Abnormal valve closing circuit shown.

[0072] When the power supply module recovers and is powered on again, the non-inverting input terminal 1 of the operational amplifier U10 has an RC circuit and powers on slowly, while the inverting input terminal 3 of the operational amplifier U10 is directly connected to the first power supply and powers on quickly. Therefore, the input voltage of the non-inverting input terminal 1 of the operational amplifier U10 is lower than the input voltage of the inverting input terminal 3. Therefore, the output terminal 4 of the operational amplifier U10 outputs a 0V level, turning off the transistor Q10, ensuring that the battery current does not pass through Q10 and cause battery leakage.

[0073] In the embodiment of the present application, the power-off continuous flow module is configured as a transistor Q10, an operational amplifier U10 and a capacitor-resistor circuit, so that the characteristic that different sizes of the input signals of the operational amplifier bring about different output results can be utilized, the transistor can be controlled to be cut off or turned on, and the discharge characteristics of the RC circuit after the power is disconnected can be utilized to make the output voltage level greater than 0, so that the transistor is turned on, and the entire power-off continuous flow module is connected to the valve closing circuit, realizing automatic conduction of the power-off continuous flow module when the power supply module abnormally loses power, thereby forming an abnormal valve closing circuit, causing the solenoid valve to automatically close, and preventing safety hazards such as dry burning.

[0074] As an optional embodiment, the power-off freewheeling module further includes a second switch, which is provided on a connection line between the power control module and the power supply module, and is linked to an operating switch of the gas stove; the method further includes: In response to the closing signal of the operating switch, the second switch is controlled to be closed synchronously, so that the power-off freewheeling module and the power control module are powered off, thereby realizing power-off protection of the power supply module.

[0075] In the embodiment of this application, Figure 1 and Figure 4 As shown, a second switch is provided that is linked to the operating switch of the gas stove. In response to the shutdown signal of the operating switch, the second switch is synchronously closed, thereby causing the current drop circuit to start from a zero state each time the gas stove is turned off or on. Specifically, the non-inverting input terminal 1 of the operational amplifier U10 is connected to an RC circuit consisting of a first resistor R10 and a first capacitor C10. Due to the existence of the RC time parameter, the non-inverting input terminal 1 of U10 powers on slowly, while the inverting input terminal 3 is directly connected to the first power supply and powers on quickly. This causes the voltage at the inverting input terminal 3 of U10 to be greater than the voltage at the non-inverting input terminal 1. The output terminal 4 of U10 outputs a 0V level, and the transistor Q10 is cut off, ensuring that the battery current does not pass through Q10. This solves the problem of battery leakage caused by the loop circuit each time the stove is turned on and off, thereby ensuring the battery life and life. By providing a mechanical switch synchronized with the operating switch, the embodiment of the present application improves the life and life of the power supply module and saves energy.

[0076] It should be noted that the power control module referred to in the embodiments of the present application is not equivalent to the control module, but the control module is equivalent to the controller.

[0077] An embodiment of the present application also provides an electronic device for controlling a gas stove, which includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or at least one program is loaded and executed by the processor to implement a gas stove control method provided in any of the above embodiments.

[0078] An embodiment of the present application also provides a computer-readable storage medium, which can be set in a terminal to store at least one instruction or at least one program for implementing a gas stove control method in a method embodiment, and the at least one instruction or at least one program is loaded and executed by a processor to implement a gas stove control method provided in the above method embodiment.

[0079] It should be noted that the order of the embodiments of the present application described above is for descriptive purposes only and does not represent the superiority or inferiority of the embodiments. The above description is of specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0080] The various embodiments in this specification are described in a progressive manner. Similar portions between the various embodiments can be referenced to each other. Each embodiment focuses on the differences between the other embodiments. In particular, the device and server embodiments are generally similar to the method embodiments, so their descriptions are relatively simple. For relevant portions, refer to the descriptions of the method embodiments.

[0081] Those skilled in the art will understand that all or part of the steps of implementing the above embodiments may be accomplished by hardware, or by programs instructing related hardware to accomplish the steps. The programs may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk, or an optical disk, etc.

[0082] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A control circuit for a gas stove, characterized in that: The control circuit includes a power supply module, a power storage module, a solenoid valve, a valve closing module and a power-off continuous flow module; the two ends of the solenoid valve are electrically connected to the power storage module and the power supply module respectively; the valve closing module includes a first switch and a power control module, and the first switch is arranged on the connection line between the solenoid valve and the power storage module; one end of the power control module is connected to the first switch and the power storage module, and the other end is connected to the power supply module; the input end of the power-off continuous flow module is connected to the power supply module and the power control module respectively, and the output end of the power-off continuous flow module is connected to the solenoid valve; The power control module is used to drive the power-off freewheeling module to be cut off together with the power supply module when the power supply module is in the power supply state, and simultaneously control the state of the first switch so that the power storage module, the first switch, the solenoid valve and the power supply module form a normal valve closing circuit; The power-off freewheeling module is used to automatically turn on when the power supply module is in a power-off state, and form an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

2. The control circuit according to claim 1, wherein: The power-off freewheeling module includes a transistor, an operational amplifier and a capacitor-resistor circuit; The non-inverting input terminal of the operational amplifier is connected to the power supply module, the capacitor-resistor circuit is provided on the connection line between the non-inverting input terminal and the power supply module, and the inverting input terminal of the operational amplifier is connected to the power control module; The output end of the operational amplifier is connected to the base of the transistor, the collector of the transistor is connected to the connection line between the solenoid valve and the power supply module, and the emitter of the transistor is grounded.

3. The control circuit according to claim 2, characterized in that: The capacitor-resistor circuit includes a first resistor and a first capacitor; The first resistor is connected in series between the non-inverting input terminal and the power supply module; One end of the first capacitor is connected to the connection line between the non-inverting input terminal and the first resistor, and the other end is connected to the negative power supply terminal of the operational amplifier.

4. The control circuit according to claim 2, characterized in that: The power-off freewheeling module further includes a diode, a second resistor, a third resistor, a second capacitor and a third capacitor; The second capacitor is connected to the cathode of the diode and the positive power supply terminal of the operational amplifier respectively, and the anode of the diode is connected to the power control module and the inverting input terminal respectively; The third resistor is provided on the connection line between the output terminal of the operational amplifier and the transistor, and the third capacitor and the third resistor are connected in parallel; One end of the second resistor is connected to the base of the transistor, and the other end is connected to the emitter of the transistor.

5. The control circuit according to claim 1, wherein: The power control module includes a power module and a controller; The controller is connected to the first switch, the power supply module and the power supply module respectively; The power supply module is respectively connected to the power storage module, the input end of the power-off continuous flow module, and the power supply module. The power supply module is used to convert the power provided by the power supply module into a first power supply and a second power supply. The first power supply is used to power the controller and the power-off continuous flow module, and the second power supply is used to charge the power storage module.

6. The control circuit according to claim 1, wherein: The power-off freewheeling module further includes a second switch, which is provided on the connection line between the power control module and the power supply module, and is linked to the operation switch of the gas stove; The second switch is a mechanical switch.

7. The control circuit according to claim 5, characterized in that: When the power supply module is a battery, the voltage of the first power supply and the voltage of the second power supply are both greater than the voltage of the battery.

8. A method for controlling a gas stove, characterized in that: The method is implemented by the control circuit of the gas stove according to any one of claims 1 to 7, and includes: When the power supply module is in a power supply state and the gas stove is in a normal working state, power is supplied to the power control module through the power supply module, so that the power control module and the power supply module jointly drive the power-off freewheeling module to be cut off, and the power control module charges the power storage module, and when receiving a valve closing signal, the power control module drives the first switch to be turned on, thereby forming a normal valve closing circuit consisting of the power storage module, the first switch, the solenoid valve and the power supply module, so that the solenoid valve is closed; When the power supply module is in a power-off state and the gas stove is in a normal working state, the power-off freewheeling module is controlled to be automatically turned on, forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

9. The method according to claim 8, characterized in that The power-off freewheeling module includes a transistor, an operational amplifier, and a capacitor-resistor circuit; when the power supply module is in a power-off state and the gas stove is in a normal working state, the power-off freewheeling module is controlled to automatically turn on, forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so as to utilize the energy stored in the power storage module to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove, including: When the power supply module is in a power-off state and the gas stove is in a normal working state, the energy stored in the capacitor-resistor circuit drives the operational amplifier to output a high level, so that the transistor is automatically turned on, thereby forming an abnormal valve closing circuit with the power storage module, the first switch, and the solenoid valve, so that the energy stored in the power storage module is used to automatically close the solenoid valve, thereby realizing automatic flameout protection of the gas stove.

10. The method according to claim 8, characterized in that The power-off freewheeling module further includes a second switch, which is provided on a connection line between the power control module and the power supply module, and is linked to an operating switch of the gas stove; the method further includes: In response to the closing signal of the operating switch, the second switch is controlled to be closed synchronously, so that the power-off freewheeling module and the power control module are powered off, thereby realizing power-off protection of the power supply module.

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