Cooking hob and shut-off valve device for de-energizing a cooking hob

Abstract

The disclosure provides a stove and a valve closing device for power-off of the stove, the valve closing device comprising a master control module and a valve closing control circuit corresponding to a target burner of the stove which has started a timing valve closing function; the master control module is electrically connected with the valve closing control circuit and a power module of the stove respectively; the valve closing control circuit comprises an energy storage unit; the master control module is used for sending a charging control signal to the valve closing control circuit, and the valve closing control circuit is used for charging the energy storage unit after receiving the charging control signal and acquiring a power supply signal of the power module to determine whether the stove is powered off; the master control module is also used for sending a valve closing control signal to the valve closing control circuit when the power supply signal represents that the stove is powered off, and the valve closing control circuit is also used for controlling the energy storage unit to discharge to make the gas valve corresponding to the target burner close after receiving the valve closing control signal. The disclosure can promptly close the corresponding gas valve of the stove when the stove is powered off, thereby reducing the occurrence of safety accidents.

Description

Technical Field

[0001] This disclosure relates to the field of smart home appliance technology, and in particular to a cooktop and a valve shut-off device for powering off the cooktop. Background Technology

[0002] Battery-powered timer cooktops are widely used. However, since users usually leave the cooking area after activating the timer shut-off function, if the battery compartment is not securely fastened, the battery is loose, or the battery falls out or the battery power is insufficient, the battery power will be interrupted or the main control module will reset, causing the cooktop to fail to achieve the timer shut-off function, ultimately creating a safety hazard. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this disclosure provides a stove and a valve shut-off device for powering off the stove.

[0004] Firstly, this disclosure provides a valve shut-off device for shutting off power to a stove.

[0005] The valve shut-off device includes a main control module and a valve shut-off control circuit, and the valve shut-off control circuit corresponds to the target burner in the stove whose timed valve shut-off function has been activated.

[0006] The main control module is electrically connected to the valve control circuit and the power module of the stove, respectively.

[0007] The valve closing control circuit includes an energy storage unit;

[0008] The main control module is used to send a charging control signal to the valve closing control circuit. The valve closing control circuit is used to charge the energy storage unit after receiving the charging control signal, and to obtain the power supply signal of the power module to determine whether the stove is powered off.

[0009] The main control module is also used to send a valve-closing control signal to the valve-closing control circuit when the power supply signal indicates that the stove is powered off. The valve-closing control circuit is also used to control the energy storage unit to discharge after receiving the valve-closing control signal so that the gas valve corresponding to the target stove head is closed.

[0010] Optionally, the energy storage unit includes an energy storage capacitor; the valve closing control circuit further includes a first switching transistor, a second switching transistor, and a valve closing coil, wherein the first switching transistor, the energy storage capacitor, the second switching transistor, and the valve closing coil are connected in sequence; the valve closing control circuit is used to control the first switching transistor to conduct to charge the energy storage capacitor after receiving the charging control signal; the valve closing control circuit is also used to control the second switching transistor to conduct to enable the energy storage capacitor to supply power to the valve closing coil after receiving the valve closing control signal, thereby closing the gas valve corresponding to the target burner.

[0011] Optionally, the valve closing device further includes a boost circuit, which is electrically connected to the output terminal of the power module and the first switching transistor, respectively.

[0012] Optionally, both the first switching transistor and the second switching transistor are first transistors;

[0013] The base of the first switching transistor is electrically connected to the main control module, the emitter of the first switching transistor is electrically connected to the boost circuit, the collector of the first switching transistor is electrically connected to the emitter of the second switching transistor, the base of the second switching transistor is electrically connected to the main control module, and the collector of the second switching transistor is electrically connected to the valve-closing coil.

[0014] Optionally, the valve closing device further includes a second transistor, the base of which is electrically connected to the main control module, the emitter of which is grounded, and the collector of which is electrically connected to the base of the first switching transistor.

[0015] The main control module is used to send a high-level charging control signal to the second transistor and a high-level valve control signal to the second switching transistor after the target burner activates the timed valve closing function, and to send a low-level valve closing control signal to the second switching transistor after receiving the valve closing control signal.

[0016] Optionally, a pull-down resistor is provided between the main control module and the base of the second switching transistor.

[0017] Optionally, the main control module is further configured to acquire the knob signal of the target stove through the knob circuit of the target stove, and use the knob signal as the power supply signal corresponding to the power supply module; wherein, the disappearance of the power supply signal indicates that the stove is powered off.

[0018] Optionally, the valve shut-off device further includes a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The gate of the MOSFET is electrically connected to the output side of the rotary microswitch in the rotary circuit of the target stove head. The source of the MOSFET is grounded, and the drain of the MOSFET is electrically connected to the main control module. The input terminal of the rotary microswitch is electrically connected to the output terminal of the power supply module. The main control module is used to obtain the power supply signal through the drain of the MOSFET.

[0019] Optionally, the valve closing device further includes a power supply voltage acquisition circuit, which is electrically connected to the output terminal of the power supply module and the main control module;

[0020] The main control module is also used to send voltage detection signals to the power supply voltage acquisition circuit;

[0021] The power supply voltage acquisition circuit is used to acquire the voltage value of the power supply module and send it to the main control module after receiving the voltage detection signal.

[0022] Optionally, the main control module is also used to control the preset load in the stove to release the residual voltage when the difference between the voltage values ​​collected at adjacent times exceeds a first preset value.

[0023] Optionally, the main control module is further configured to send a valve-closing control signal to the valve-closing control circuit when the difference between the voltage values ​​collected at adjacent times exceeds a second preset value; wherein the second preset value is less than the first preset value.

[0024] Optionally, the energy storage unit further includes an electrolytic capacitor and a diode. The electrolytic capacitor is electrically connected to the output terminal of the power supply module and the main control module, respectively. The electrolytic capacitor is used to supply power to the main control module when the power supply signal indicates that the stove is powered off. The diode is connected between the output terminal of the power supply and the electrolytic capacitor.

[0025] Secondly, this disclosure provides a stove that includes the valve shut-off device described in the first aspect.

[0026] Based on common knowledge in the field, the above-described embodiments can be combined in any way to obtain the preferred embodiments of this disclosure.

[0027] The positive and progressive effects of this disclosure are as follows:

[0028] This disclosure provides a cooktop and a valve shut-off device for the cooktop. The valve shut-off device targets a cooktop with its timed valve shut-off function already activated. A main control module sends a charging control signal to the corresponding valve shut-off control circuit of the target cooktop. Upon receiving the charging control signal, the valve shut-off control circuit charges the energy storage unit. The main control module can promptly detect power module anomalies based on the power supply signal and quickly shut off the gas valve of the target cooktop by controlling the discharge of the energy storage unit in the valve shut-off control circuit, thus avoiding various safety problems caused by the inability to shut off the gas valve after a power outage. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the valve closing device provided in Embodiment 1 of this disclosure;

[0030] Figure 2 This is a schematic diagram of the boost circuit provided in Embodiment 1 of this disclosure;

[0031] Figure 3This is a first structural schematic diagram of the valve closing control circuit provided in Embodiment 1 of this disclosure;

[0032] Figure 4 This is a second structural schematic diagram of the valve closing control circuit provided in Embodiment 1 of this disclosure;

[0033] Figure 5 This is a partial circuit diagram of the valve closing device provided in Embodiment 1 of this disclosure;

[0034] Figure 6 This is a schematic diagram of the knob circuit of the target stove provided in Embodiment 2 of this disclosure;

[0035] Figure 7 This is a schematic diagram of the power supply voltage acquisition circuit provided in Embodiment 3 of this disclosure;

[0036] Figure 8 This is a schematic diagram of the input circuit of the digital-to-analog converter provided in Embodiment 3 of this disclosure;

[0037] Figure 9 This is a schematic diagram of the control flow of the main control module provided in Embodiment 3 of this disclosure;

[0038] Figure 10 This is a schematic diagram of the stove provided in Embodiment 4 of this disclosure. Detailed Implementation

[0039] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0040] It should be noted that if the embodiments of this disclosure involve descriptions such as "first" and "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features.

[0041] Furthermore, the technical solutions of various implementation methods can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this disclosure.

[0042] Example 1

[0043] This embodiment provides a valve shut-off device for a stove.

[0044] like Figure 1As shown, the valve shut-off device 100 includes a main control module 101 and a valve shut-off control circuit 102, which corresponds to the target burner in the stove that has activated the timed valve shut-off function.

[0045] It should be understood that a cooktop may include not only cooktops with a timed valve shut-off function, but also cooktops without this function. The target cooktop is the one with the timed valve shut-off function already activated.

[0046] The main control module 101 is electrically connected to the valve shut-off control circuit 102 and the power module 201 of the stove. The valve shut-off control circuit 102 includes an energy storage unit.

[0047] Specifically, the main control module 101 sends a charging control signal to the valve shut-off control circuit 102. Upon receiving the charging control signal, the valve shut-off control circuit 102 charges the energy storage unit and acquires the power supply signal from the power module to determine if the stove is powered off. The main control module 101 also sends a valve shut-off control signal to the valve shut-off control circuit 102 when the power supply signal indicates a power outage. Upon receiving the valve shut-off control signal, the valve shut-off control circuit 102 controls the energy storage unit to discharge, thereby closing the gas valve corresponding to the target burner.

[0048] The valve shut-off device 100 for stoves provided in this embodiment can detect abnormalities in the power supply module 201 in a timely manner based on the power supply signal. That is, after the power supply signal indicates that the stove is powered off, the main control module 101 controls the energy storage unit in the valve shut-off control circuit 102 to discharge and supply power, so as to quickly shut off the gas valve of the target stove head. This can successfully avoid various safety problems caused by the inability to shut off the gas valve after the stove is powered off.

[0049] As an optional implementation, the energy storage unit includes an energy storage capacitor; the valve closing control circuit 102 further includes a first switching transistor, a second switching transistor, and a valve closing coil. The first switching transistor, the energy storage capacitor, the second switching transistor, and the valve closing coil are connected in sequence.

[0050] Specifically, the valve-closing control circuit 102 is used to control the first switching transistor to conduct and charge the energy storage capacitor after receiving the charging control signal. The valve-closing control circuit 102 is also used to control the second switching transistor to conduct and enable the energy storage capacitor to supply power to the valve-closing coil after receiving the valve-closing control signal, thereby closing the gas valve corresponding to the target burner.

[0051] As an optional implementation, the valve closing device 100 further includes a boost circuit, which is electrically connected to the output terminal of the power module 201 and the first switching transistor.

[0052] For example, see Figure 2A 5V boost circuit is provided. The power module 201 outputs 3V, and after passing through the boost circuit, the output voltage is 5V, which is transmitted to the valve control circuit 102.

[0053] As an optional implementation, both the first and second switching transistors are first transistors. Specifically, the base of the first switching transistor is electrically connected to the main control module 101, the emitter of the first switching transistor is electrically connected to the boost circuit, the collector of the first switching transistor is electrically connected to the emitter of the second switching transistor, the base of the second switching transistor is electrically connected to the main control module 101, and the collector of the second switching transistor is electrically connected to the valve-closing coil.

[0054] For example, see Figure 3 When the target burner activates the timed valve shut-off function, the main control module 101 sends a charging control signal to the valve shut-off control circuit 102 corresponding to the target burner via the charging control pin 1026, causing the first switching transistor 1022 to conduct and charge the energy storage capacitor 1021. Correspondingly, when the power supply signal indicates a power outage, the main control module 101 sends a valve shut-off control signal to the valve shut-off control circuit 102 corresponding to the target burner via the discharge control pin 1027, causing the second switching transistor 1023 to conduct. The energy storage capacitor 1021 then supplies power to the valve shut-off coil 1024, which in turn shuts off the gas valve corresponding to the target burner.

[0055] In this embodiment, it is considered that before the main control module 101 is powered on and initialized, the I / O ports connected to the charging control pin 1026 and the discharging control pin 1027 are in an unconfigured state. That is, when the main control module 101 is powered on and initialized, the first switch 1022 and the second switch 1023 may be turned on at the same time, causing a 5V short circuit to ground.

[0056] Therefore, this embodiment also provides another optional implementation method. The valve closing device 100 further includes a second transistor 1025. The base of the second transistor 1025 is electrically connected to the main control module 101, the emitter of the second transistor 1025 is grounded, and the collector of the second transistor 1025 is electrically connected to the base of the first switching transistor 1022. The main control module 101 is used to continuously send a high-level charging control signal to the second transistor 1025 and a high-level valve control signal to the second switching transistor 1023 after the target stove starts the timed valve closing function, and to send a low-level valve closing control signal to the second switching transistor 1023 after receiving the valve closing control signal.

[0057] For example, see Figure 4When the target burner activates the timed valve shut-off function, the main control module 101 continuously sends a high-level charging control signal to the valve shut-off control circuit 102 corresponding to the target burner through the charging control pin 1026, and continuously sends a low-level valve control signal to the valve shut-off control circuit 102 corresponding to the target burner through the discharging control pin 1027.

[0058] When the base of the second transistor 1025 receives a high-level charging control signal, it will cause the emitter and collector of the second transistor 1025 to conduct, i.e., the second transistor 1025 will turn on. Since the base of the first switching transistor 1022 is connected to the collector of the second transistor 1025, and the emitter of the second transistor 1025 is grounded, the conduction of the second transistor 1025 is equivalent to the base of the first switching transistor 1022 being grounded. When the base of the first switching transistor 1022 is grounded, the first switching transistor 1022 will turn on, thereby charging the energy storage capacitor 1021 with the current transmitted through the boost circuit.

[0059] When the power module 201 is supplying power to the stove normally, the base of the second switching transistor 1023 will continuously receive a high-level valve control signal to maintain its open state. When the power supply signal indicates that the stove is de-energized, the main control module 101 will send a low-level valve-closing control signal to the valve control circuit to turn on the second switching transistor 1023. The energy storage capacitor 1021 can then supply power to the valve-closing coil 1024, which will then close the gas valve corresponding to the target burner.

[0060] To ensure that the main control module 101 can successfully send the valve closing control signal, as an optional implementation method, see [link to implementation details]. Figure 5 The energy storage unit also includes an electrolytic capacitor 1041 and a diode 1042. The electrolytic capacitor 1041 is electrically connected to the output terminal of the power supply module 201 and the main control module 101, respectively. The electrolytic capacitor 1041 is used to supply power to the main control module 101 when the power supply signal indicates that the stove is powered off. The diode 1042 is disposed between the output terminal of the power supply and the electrolytic capacitor 1041.

[0061] Specifically, if the output terminals of the main control module 101 and the power supply module 201 are directly connected, the electrolytic capacitor 1041 is placed between the output terminals of the main control module 101 and the power supply module 201 so that when the power supply module 201 fails to supply power, the electrolytic capacitor 1041 can supply power to the main control module 101, thereby ensuring that the main control module 101 can continue to work for a period of time after the power supply module 201 stops supplying power, so that the valve closing control signal can be successfully issued.

[0062] If the driving voltage of the main control module 101 differs from the voltage provided by the power supply module 201, a direct electrical connection between them is not possible. For example, the power supply module 201 provides 3V, and the driving voltage of the main control module 101 is 5V. (See [link to relevant documentation]). Figure 5 The input terminal of the boost module can be electrically connected to the output terminal of the power supply module 201, the main control module 101 can be electrically connected to the output terminal of the boost module, and the electrolytic capacitor 1041 is placed between the output terminal of the boost module and the main control module 101.

[0063] Furthermore, this embodiment also takes into account the situation where the main control module 101 is unable to send a valve closing control signal due to various abnormal conditions. As an optional implementation, a pull-down resistor 1028 is provided between the main control module 101 and the base of the second switching transistor 1023.

[0064] For example, see Figure 3 and Figure 4 A grounded pull-down resistor 1028 is provided between the discharge control pin 1027 and the base of the second switching transistor 1023. If the main control module 101 is unable to send a valve closing control signal due to an abnormal situation, it will also be unable to send a high-level valve control signal. In this case, the base of the second switching transistor 1023 can be grounded through the pull-down resistor 1028, so that the second switching transistor 1023 can be turned on, thereby enabling the energy storage capacitor 1021 to supply power to the valve closing coil 1024.

[0065] Example 2

[0066] The valve shut-off device 100 for a stove in this embodiment is a further improvement on embodiment 1.

[0067] Specifically, the main control module 101 is also used to obtain the knob signal of the target stove through the knob circuit of the target stove, and use the knob signal as the power supply signal of the power module 201.

[0068] For example, such as Figure 6 As shown in the knob circuit, when the power module 201 is powered normally, the knob signal of the target stove can be obtained through the power supply signal detection port 1011.

[0069] If the user only activates the timed valve shut-off function on the left or right knob, it is only necessary to continuously monitor the knob signal corresponding to the activated timed valve shut-off function. When the power module 201 interrupts power supply, the knob signal is lost. That is, the loss of power supply signal indicates that the stove is powered off.

[0070] As an optional implementation, the valve shut-off device 100 further includes a MOSFET 105. The gate of the MOSFET 105 is electrically connected to the output side of the rotary microswitch 2021 in the rotary circuit of the target stove head. The source of the MOSFET 105 is grounded, and the drain of the MOSFET 105 is electrically connected to the main control module 101. The input terminal of the rotary microswitch 2021 is electrically connected to the output terminal of the power supply module 201. The main control module 101 is used to obtain the power supply signal through the drain of the MOSFET 105. Through this MOSFET 105, changes in the power supply signal can be detected more promptly and quickly.

[0071] In practical applications, because the input terminal of the rotary microswitch 2021 is connected to the positive terminal of the power module 201, i.e., the output terminal of the power module 201, when the power supply to the power module 201 is abnormal and the voltage value drops significantly from 3V, the knob signal will change. For example, if the power supply to the power module 201 is interrupted, the knob signal will be lost directly. Therefore, when the knob signal can no longer be obtained through the power supply signal detection port 1011, it can be considered that the power supply signal is lost, and thus it can be determined that the power supply to the power module 201 is abnormal. Although there is a situation where the user actively closes the knob after activating the timed valve-closing function, the loss of the knob signal will also be identified as a power outage of the stove. However, since the corresponding gas valve is also closed when the knob is closed, performing the valve-closing operation has no impact on the working status of the stove.

[0072] In a specific application, the cooktop typically includes a left-side knob and a right-side knob. As an optional implementation, the power supply signal includes a knob signal from the left-side knob and a knob signal from the right-side knob. A power supply signal is considered lost when both the knob signals from the left-side and right-side knobs are simultaneously lost.

[0073] Example 3

[0074] The valve shut-off device 100 for a stove in this embodiment is a further improvement on embodiment 2.

[0075] Specifically, the valve closing device 100 also includes a power supply voltage acquisition circuit, which is electrically connected to the output terminal of the power supply module 201 and the main control module 101; the main control module 101 is also used to send a voltage detection signal to the power supply voltage acquisition circuit; the power supply voltage acquisition circuit is used to acquire the voltage value of the power supply module 201 after receiving the voltage detection signal and send it to the main control module 101.

[0076] For example, see Figure 7The power supply voltage acquisition circuit receives the voltage detection signal through the voltage detection control pin 1031, turning on the third transistor 1032. Since the emitter of the third transistor 1032 is grounded, and its collector is connected to the base of the fourth transistor 1033, the turn-on of the third transistor 1032 grounds the base of the fourth transistor 1033, thus turning on the fourth transistor 1033. The voltage value of the power supply module 201 is then sent to the analog-to-digital converter (ADC) of the main control module 101 through the voltage signal transmission port 1034. The input circuit structure of the ADC of the main control module 101 is as follows... Figure 8 As shown, the voltage value sent by the voltage signal sending port 1034 is received through the signal receiving port 1012 and input to the digital-to-analog converter of the main control module through the signal input port 1013.

[0077] Based on Embodiment 2, this embodiment considers that after the user activates the timed valve shut-off function of the target stove, they may actively close the knob, causing the knob signal to be lost, which could lead to misjudgment by the valve shut-off device 100. Therefore, it proposes to use a power supply voltage detection circuit 103 to send the voltage value of the power module 201 to the digital-to-analog converter of the main control module 101 in real time. Using the loss of power supply signal as a trigger condition, combined with the change in voltage value, it can not only detect the stove power failure in a timely manner, but also close the solenoid valve corresponding to the target stove more accurately and quickly based on the obtained voltage value of the power module 201.

[0078] As an optional implementation, the main control module 101 is also used to control the preset load in the stove to release the residual voltage when the difference between the voltage values ​​collected at adjacent times exceeds a first preset value.

[0079] As an optional implementation, the main control module 101 is also used to send a valve-closing control signal to the valve-closing control circuit 102 when the difference between the voltage values ​​collected at adjacent times exceeds a second preset value; wherein the second preset value is less than the first preset value.

[0080] In a specific application, see Figure 9 The aforementioned valve-closing device 100 automatically closes the gas valve. The main control module 101 needs to perform the following steps:

[0081] Step S301: Detect whether the power supply signal is lost. If the power supply signal is lost, proceed to the second stage.

[0082] Step S302: Detect whether the voltage drop of the power module exceeds 0.5V. If it does, proceed to the third stage.

[0083] Step S303: Control the preset load connected to 3V voltage in the stove to release residual voltage;

[0084] Step S304: Check if the voltage value of the power module is less than 1V. If it is less, proceed to the fifth stage.

[0085] Step S305: Send a valve closing control signal to the valve closing control circuit.

[0086] One end of the valve-closing coil 1024 is connected to the positive 3V terminal of the power module 201, and the other end is connected to the energy storage capacitor 1021. After the main control module 101 detects that the voltage value of the power module 201 has dropped beyond the first preset threshold, the main control module 101 controls the opening of various preset loads connected to the 3V voltage in the entire circuit of the stove, such as opening preset loads like LEDs and buzzers. This can quickly reduce the voltage value at the end of the valve-closing coil 1024 connected to the power module 201, so as to form a larger voltage difference between the two ends of the valve-closing coil 1024. This allows the voltage of the energy storage capacitor 1021 to be released more thoroughly, so that the valve-closing coil 1024 can obtain a more continuous current pulse, thereby increasing the success rate of driving the gas valve to close.

[0087] Example 4

[0088] This embodiment provides a stove, including a valve shut-off device 100 for the stove according to any of the aforementioned embodiments and implementations. This valve shut-off device 100 significantly improves the success rate of closing the gas valve, enabling timely and rapid closure of the gas valve of the target burner with the timed valve shut-off function activated when the stove is powered off, thus reducing the occurrence of safety accidents.

[0089] In a specific application, see Figure 10 The cooktop 200 includes a power module 201, a knob circuit 202, a boost circuit 203, and a valve shut-off device 100. The valve shut-off device 100 includes a main control module 101, a valve shut-off control circuit 102, and a power voltage detection circuit 103.

[0090] The main control module 101 is electrically connected to the boost circuit 203, the knob circuit 202, the valve closing control circuit 102, and the power supply voltage detection circuit 103, respectively.

[0091] The main control module 101 selects the burner with the timed valve shut-off function enabled as the target burner and sends a charging control signal to the valve shut-off control circuit 102. Correspondingly, after receiving the charging control signal, the valve shut-off control circuit 102 controls the first switching transistor 1022 to conduct and charge the energy storage capacitor 1021.

[0092] The main control module 101 acquires the knob signal of the target burner through the power supply signal detection port 1011 on the knob circuit 202 of the target burner, using it as a power supply signal characterizing the power supply status of the power module 201. Based on the power supply signal, the main control module 101 determines the power supply status of the power module 201, and thus determines whether the stove 200 is powered off. The main control module 101 also acquires the voltage value of the power module 201 through the power voltage detection circuit 103, and based on the voltage value, determines the power supply status of the power module 201 more accurately. Based on the change in voltage value, it promptly determines whether the stove 200 is powered off, and quickly sends a valve-closing control signal to the valve-closing control circuit 102. Correspondingly, after receiving the valve-closing control signal, the valve-closing control circuit 102 controls the energy storage capacitor 1021 to supply power to the valve-closing coil 1024 to close the gas valve corresponding to the target burner.

[0093] The boost circuit 203 is electrically connected to the output terminal of the power module 201 and the valve closing control circuit 102, respectively. The boost circuit 203 is used to increase the 3V voltage output by the power module 201 to 5V voltage, and provide it to the main control module 101 and the valve closing control circuit 102, respectively.

[0094] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A valve shut-off device for cutting off power to a stove, characterized in that, The valve shut-off device includes a main control module and a valve shut-off control circuit, and the valve shut-off control circuit corresponds to the target burner in the stove whose timed valve shut-off function has been activated. The main control module is electrically connected to the valve control circuit and the power module of the stove, respectively. The valve closing control circuit includes an energy storage unit; The main control module is used to send a charging control signal to the valve closing control circuit. The valve closing control circuit is used to charge the energy storage unit after receiving the charging control signal, and to obtain the power supply signal of the power module to determine whether the stove is powered off. The main control module is also used to send a valve-closing control signal to the valve-closing control circuit when the power supply signal indicates that the stove is powered off. The valve-closing control circuit is also used to control the energy storage unit to discharge after receiving the valve-closing control signal so that the gas valve corresponding to the target stove head is closed. The main control module is also used to acquire the knob signal of the target stove through the knob circuit of the target stove, and use the knob signal as the power supply signal corresponding to the power module; wherein, the disappearance of the power supply signal indicates that the stove is powered off. The valve closing device also includes a power voltage acquisition circuit, which is electrically connected to the output terminal of the power module and the main control module. The main control module is also used to send voltage detection signals to the power supply voltage acquisition circuit; The power supply voltage acquisition circuit is used to acquire the voltage value of the power module and send it to the main control module after receiving the voltage detection signal; The main control module is also used to control the preset load in the stove to release residual voltage when the difference between the voltage values ​​collected at adjacent times exceeds a first preset value; The main control module is also used to send a valve-closing control signal to the valve-closing control circuit when the difference between the voltage values ​​collected at adjacent times exceeds a second preset value; wherein the second preset value is less than the first preset value.

2. The valve shut-off device for power off a stove according to claim 1, characterized in that, The energy storage unit includes an energy storage capacitor; The valve closing control circuit further includes a first switching transistor, a second switching transistor, and a valve closing coil, wherein the first switching transistor, the energy storage capacitor, the second switching transistor, and the valve closing coil are connected in sequence; The valve-closing control circuit is used to control the first switch to turn on to charge the energy storage capacitor after receiving the charging control signal. The valve-closing control circuit is also used to control the second switch tube to turn on after receiving the valve-closing control signal so that the energy storage unit supplies power to the valve-closing coil and closes the gas valve corresponding to the target burner.

3. The valve shut-off device for power off a stove according to claim 2, characterized in that, The valve closing device also includes a boost circuit, which is electrically connected to the output terminal of the power module and the first switching transistor.

4. The valve shut-off device for power off a stove according to claim 3, characterized in that, Both the first switching transistor and the second switching transistor are first transistors; The base of the first switching transistor is electrically connected to the main control module, the emitter of the first switching transistor is electrically connected to the boost circuit, the collector of the first switching transistor is electrically connected to the emitter of the second switching transistor, the base of the second switching transistor is electrically connected to the main control module, and the collector of the second switching transistor is electrically connected to the valve-closing coil.

5. The valve shut-off device for power off a stove according to claim 4, characterized in that, The valve closing device also includes a second transistor, the base of which is electrically connected to the main control module, the emitter of which is grounded, and the collector of which is electrically connected to the base of the first switching transistor. The main control module is used to send a high-level charging control signal to the second transistor and a high-level valve-closing control signal to the second switching transistor after the target burner activates the timed valve-closing function, and to send a low-level valve-closing control signal to the second switching transistor after receiving the valve-closing control signal.

6. The valve shut-off device for power off a stove according to claim 5, characterized in that, A pull-down resistor is provided between the main control module and the base of the second switching transistor.

7. The valve shut-off device for power off a stove according to claim 1, characterized in that, The valve shut-off device also includes a MOS transistor, the gate of which is electrically connected to the output side of the rotary micro switch in the rotary circuit of the target stove head, the source of which is grounded, and the drain of which is electrically connected to the main control module. The input terminal of the rotary micro switch is electrically connected to the output terminal of the power module; The main control module is used to obtain the power supply signal through the drain of the MOS transistor.

8. The valve shut-off device for power off a stove according to any one of claims 1-7, characterized in that, The energy storage unit also includes an electrolytic capacitor and a diode. The electrolytic capacitor is electrically connected to the output terminal of the power module and the main control module, respectively. The electrolytic capacitor is used to supply power to the main control module when the power supply signal indicates that the stove is powered off. The diode is connected between the output terminal of the power supply and the electrolytic capacitor.

9. A stove, characterized in that, Includes the valve shut-off device for power off a stove as described in any one of claims 1-8.

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