Power-off flameout protection circuit and kitchen appliance

Abstract

The utility model provides a power-off flameout protection circuit and a kitchen appliance, the kitchen appliance comprises a main coil, an auxiliary coil and a thermocouple, and the auxiliary coil is connected with the thermocouple; the power-off flameout protection circuit comprises a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit and an energy storage circuit. When the third switching circuit and the fourth switching circuit are both in an on state and the energy storage circuit releases electric energy, the electric energy released by the energy storage circuit is converted into magnetic force, and the converted magnetic force and the magnetic force generated by the secondary coil counteract each other, so that the valve body of the kitchen appliance is closed, and the thermocouple stops generating thermoelectric force. The power-off flameout protection can be performed on the gas stove (or the integrated stove) powered by the power adapter in a power-off state, so that the potential safety hazard is eliminated, and the experience feeling of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a power-off flameout protection circuit and a kitchen appliance. Background Art

[0002] In the prior art, the closure of the valve body of a household gas stove (or integrated stove) after ignition is usually maintained by the thermoelectric potential generated by a thermocouple, and does not need to rely on its own power supply to maintain it continuously. This can save electricity for battery-powered gas stoves. For gas stoves (or integrated stoves) powered by a power adapter, when the mains power is cut off or tripped, the combustion state will continue to be maintained without extinguishing the flame. However, if the gas stove (or integrated stove) itself has intelligent timing, anti-dry burning or other protection functions, these functions will fail after the power is cut off, and the gas stove (or integrated stove) will be in a continuous combustion state, which poses certain safety hazards and a poor user experience. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a power-off flameout protection circuit and a kitchen appliance to ensure that a gas stove (or integrated stove) powered by a power adapter can be protected from power-off flameout when the device is powered off, thereby eliminating safety hazards and improving the user experience.

[0004] In a first aspect, an embodiment of the present invention provides a power-off and flameout protection circuit applied to a kitchen appliance, the kitchen appliance comprising: a main coil, a secondary coil and a thermocouple, the secondary coil being connected to the thermocouple; the power-off and flameout protection circuit comprising: a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit and an energy storage circuit; the first switch circuit, the second switch circuit, the third switch circuit, the fourth switch circuit and the energy storage circuit are all connected to a power supply, the second switch circuit is connected to the third switch circuit, the first switch circuit is connected to the fourth switch circuit, the third switch circuit and the fourth switch circuit are both connected to the energy storage circuit, and the third switch circuit and the fourth switch circuit are connected to the main coil; the first switch circuit is used to determine an on state or an off state based on the power supply; the second switch circuit is used to determine an on state or an off state based on the power supply; the third switch circuit is used to determine an on state or an off state based on the second switch circuit and the power supply; the fourth switch circuit is used to determine an on state or an off state based on the first switch circuit and the power supply; the energy storage circuit is used to store or release electrical energy based on the power supply.

[0005] In the preferred embodiment provided by the present invention, when the kitchen appliance is in a burning state, the power supply is not 0, the first switch circuit and the second switch circuit are both in the open state, the energy storage circuit stores electrical energy, and the third switch circuit and the fourth switch circuit are in the closed state.

[0006] In a preferred embodiment provided by the present invention, when the kitchen appliance is in a power-off state, the power supply is 0, the first switch circuit and the second switch circuit are in a closed state, the third switch circuit and the fourth switch circuit are in an open state, and the energy storage circuit releases electrical energy.

[0007] In a preferred embodiment provided by the present utility model, the above-mentioned first switching circuit includes: an eighth resistor, a tenth resistor and a fourth transistor; the base of the fourth transistor is connected to the eighth resistor, and the base of the fourth transistor, the tenth resistor, and the emitter of the fourth transistor are connected in sequence; the second switching circuit includes: a twelfth resistor, a thirteenth resistor and a sixth transistor; the base of the sixth transistor is connected to the twelfth resistor, and the base of the sixth transistor, the thirteenth resistor, and the emitter of the sixth transistor are connected in sequence; the third switching circuit includes: a seventh resistor, an eleventh resistor and a fifth transistor; the base of the fifth transistor is connected to the eleventh resistor; the base of the fifth transistor is connected to the seventh resistor; the fourth switching circuit includes: a fifth resistor, a sixth resistor, a third transistor and a fourth diode; the base of the third transistor is connected to the fifth resistor; the base of the third transistor is connected to the sixth resistor, and the fourth diode is connected to the emitter of the third transistor.

[0008] In a preferred embodiment provided by the present invention, when the kitchen appliance is in a burning state, the fourth transistor and the sixth transistor are turned on, and the fifth transistor and the third transistor are turned off.

[0009] In a preferred embodiment provided by the present invention, when the kitchen appliance is in a power-off state, the fifth transistor and the third transistor are turned on, and the fourth transistor and the sixth transistor are turned off.

[0010] In a preferred embodiment provided by the present invention, the fourth diode is used to ensure that the third transistor is turned on when the power is off.

[0011] In a preferred embodiment provided by the present invention, the resistance values of the eighth resistor, the tenth resistor, the twelfth resistor, the thirteenth resistor, the seventh resistor, the eleventh resistor, the fifth resistor and the sixth resistor are all determined based on the level of the power supply.

[0012] In a preferred embodiment provided by the present invention, the above-mentioned kitchen appliance includes: a gas stove or an integrated stove with a double-coil solenoid valve.

[0013] In a second aspect, an embodiment of the present invention further provides a kitchen appliance, which includes any one of the above-mentioned power-off and flameout protection circuits.

[0014] The embodiments of the present invention bring the following beneficial effects:

[0015] The present invention provides a power-off flameout protection circuit and a kitchen appliance. When the third and fourth switch circuits are both in the on state and the energy storage circuit releases electrical energy, the released energy is converted into magnetic force. This converted magnetic force offsets the magnetic force generated by the secondary coil, closing the valve of the kitchen appliance and stopping the thermocouple from generating thermoelectric potential. This ensures that a gas stove (or integrated stove) powered by a power adapter can be protected from power failure when the device is powered off, thereby eliminating safety hazards and improving the user experience.

[0016] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by practicing the above-mentioned technology of the present disclosure.

[0017] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of a power-off flameout protection circuit provided by an embodiment of the present utility model;

[0020] Figure 2 A schematic diagram of a circuit state of a power-off flameout protection circuit when a gas stove is in a combustion state provided by an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of a circuit state of a power-off flameout protection circuit of a gas stove provided by an embodiment of the present utility model when the gas stove is in a power-off state;

[0022] Figure 4 A circuit diagram of a power-off flameout protection circuit provided by an embodiment of the utility model;

[0023] Figure 5 The present invention provides a structural diagram of a kitchen appliance according to an embodiment of the present invention.

[0024] Icon: 100-kitchen appliance; 11-main coil; 12-secondary coil; 13-thermocouple; 200-power-off protection circuit; 21-first switch circuit; 22-second switch circuit; 23-third switch circuit; 24-fourth switch circuit; 25-energy storage circuit; 3-power supply; 4-valve body. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] At present, the valve body closure of a household gas stove (or integrated stove) after ignition is usually maintained by the thermoelectric potential generated by a thermocouple, and does not need to rely on its own power supply to maintain continuous maintenance. This can save electricity for battery-powered gas stoves. For gas stoves (or integrated stoves) powered by a power adapter, when the mains power is cut off or tripped, the combustion state will continue to be maintained without extinguishing the flame. However, if the gas stove (or integrated stove) itself has intelligent timing, anti-dry burning or other protection functions, these functions will become ineffective after the power is cut off, and the gas stove (or integrated stove) will be in a continuous combustion state, posing certain safety risks and a poor user experience.

[0027] Based on this, the embodiments of the present invention provide a power-off and flameout protection circuit and a kitchen appliance, specifically providing a power-off and flameout protection circuit for a gas stove, ensuring that the gas stove (or integrated stove) powered by a power adapter can perform power-off and flameout protection when the device is powered off, thereby eliminating safety hazards and improving the user experience.

[0028] To facilitate understanding of this embodiment, a power-off flameout protection circuit disclosed in an embodiment of the present utility model is first introduced in detail.

[0029] Example 1:

[0030] The present invention provides a power failure protection circuit for kitchen appliances. Figure 1 As shown in the structural diagram of a power-off flameout protection circuit, the kitchen appliance 100 includes: a main coil 11, a secondary coil 12 and a thermocouple 13, and the secondary coil 12 is connected to the thermocouple 13; the power-off flameout protection circuit 200 includes: a first switch circuit 21, a second switch circuit 22, a third switch circuit 23, a fourth switch circuit 24, and an energy storage circuit 25.

[0031] The first switch circuit 21, the second switch circuit 22, the third switch circuit 23, the fourth switch circuit 24, and the energy storage circuit 25 are all connected to the power supply 3, the second switch circuit 22 is connected to the third switch circuit 23, the first switch circuit 21 is connected to the fourth switch circuit 24, the third switch circuit 23 and the fourth switch circuit 24 are both connected to the energy storage circuit 25, and the third switch circuit 23 and the fourth switch circuit 24 are connected to the main coil 11.

[0032] The first switching circuit is used to determine the on state or off state based on the power supply; the second switching circuit is used to determine the on state or off state based on the power supply; the third switching circuit is used to determine the on state or off state based on the second switching circuit and the power supply; the fourth switching circuit is used to determine the on state or off state based on the first switching circuit and the power supply; the energy storage circuit is used to store electrical energy or release electrical energy based on the power supply.

[0033] When the third switch circuit and the fourth switch circuit are both in the on state and the energy storage circuit releases electrical energy, the electrical energy released by the energy storage circuit is converted into magnetic force, and the converted magnetic force and the magnetic force generated by the secondary coil offset each other, so that the valve body of the kitchen appliance is closed and the thermocouple stops generating thermoelectric potential.

[0034] The kitchen appliance in this embodiment may include a gas stove or an integrated stove with a double-coil solenoid valve.

[0035] The power-off and flameout protection circuit provided in the embodiment of the present utility model is mainly suitable for dual-coil solenoid valves. The dual-coil solenoid valve package includes a main coil and a secondary coil. Both the main coil and the secondary coil can act on the valve body to control the on and off of the outlet valve. Usually, the main coil is connected to the hardware circuit, and the secondary coil is connected to the thermocouple. During ignition, the hardware circuit supplies power to the main coil to control the closing of the valve body. After normal combustion, the hardware circuit is powered off. At this time, the thermoelectric potential generated by the thermocouple supplies power to the secondary coil to maintain the valve body in an open state.

[0036] like Figure 1 As shown, the first switch circuit 21 is controlled by the power supply 3, with 1 as its control terminal; the second switch circuit 22 is controlled by the power supply 3, with 2 as its control terminal; the third switch circuit 23 is jointly controlled by the power supply 3 and the second switch circuit 22, with 3 as its control terminal; the fourth switch circuit 24 is jointly controlled by the power supply 3 and the first switch circuit 21, with 4 as its control terminal.

[0037] This embodiment of the utility model provides a power-off flameout protection circuit. When the third and fourth switch circuits are both in the on state and the energy storage circuit releases electrical energy, the released electrical energy of the energy storage circuit is converted into magnetic force. This converted magnetic force offsets the magnetic force generated by the secondary coil, closing the valve body of the kitchen appliance and stopping the thermocouple from generating thermoelectric potential. This ensures that even when a gas stove (or integrated stove) powered by a power adapter is powered off, power-off flameout protection is implemented, eliminating safety hazards and improving the user experience.

[0038] Example 2:

[0039] An embodiment of the present utility model provides another power-off and flameout protection circuit. In some embodiments, when the kitchen appliance is in a burning state, the power supply is not 0, the first switch circuit and the second switch circuit are both in the open state, the energy storage circuit stores electrical energy, and the third switch circuit and the fourth switch circuit are in the closed state.

[0040] See also Figure 2 The circuit state diagram of a power-off flameout protection circuit when a gas stove is in a burning state is shown. When the gas stove is in a normal burning state, the power supply 3 controls the first switch circuit 21 and the second switch circuit 22 to be turned on, and the energy storage circuit 25 performs normal charging and energy storage. At this time, since the first switch circuit 21 and the second switch circuit 22 are in the turned-on state, the third switch circuit 23 and the fourth switch circuit 24 are both in the turned-off state. At this time, there is no power supply current on the main coil 11, and the auxiliary coil 12 is powered by the thermoelectric potential generated by the thermocouple 13, converting its electrical energy into magnetic force to ensure that the valve body 4 remains in the open state.

[0041] In some embodiments, when the kitchen appliance is in a power-off state, the power supply is 0, the first switch circuit and the second switch circuit are in a closed state, the third switch circuit and the fourth switch circuit are in an open state, and the energy storage circuit releases electrical energy.

[0042] See also Figure 3 The circuit state diagram of a power-off flameout protection circuit of a gas stove when the gas stove is in a power-off state is shown. When the gas stove is powered off, the power supply 3 is 0, and the first switch circuit 21 and the second switch circuit 22 are closed. The control end of the third switch circuit 23 and the control end of the fourth switch circuit 24 are controlled by the energy storage circuit 25 to rise to a high level. At this time, the third switch circuit 23 and the fourth switch circuit 24 are opened, and the energy storage circuit 25 supplies power to the main coil 11 to form a loop. At this time, the main coil 11 is energized, converting electricity into magnetic force, and the magnetic force is a repulsive force opposite to the auxiliary coil 12 and is greater than the magnetic force of the auxiliary coil 12, thereby ensuring that the valve body 4 is closed.

[0043] See also Figure 4The circuit diagram of a power-off flameout protection circuit shown in FIG. 1 shows a first switch circuit comprising: an eighth resistor R8, a tenth resistor R10, and a fourth transistor Q4; the base of the fourth transistor Q4 is connected to the eighth resistor R8, and the base of the fourth transistor Q4, the tenth resistor R10, and the emitter of the fourth transistor Q4 are connected in sequence; the second switch circuit comprises: a twelfth resistor R12, a thirteenth resistor R13, and a sixth transistor Q6; the base of the sixth transistor Q6 is connected to the twelfth resistor R12, and the base of the sixth transistor Q6, the thirteenth resistor R13, and the emitter of the sixth transistor Q6 are connected in sequence. The emitter of Q6 is connected in sequence; the third switch circuit includes: a seventh resistor R7, an eleventh resistor R11 and a fifth transistor Q5; the base of the fifth transistor Q5 is connected to the eleventh resistor R11; the base of the fifth transistor Q5 is connected to the seventh resistor R7; the fourth switch circuit includes: a fifth resistor R5, a sixth resistor R6, a third transistor Q3 and a fourth diode D4; the base of the third transistor Q3 is connected to the fifth resistor R5; the base of the third transistor Q3 is connected to the sixth resistor R6, and the fourth diode D4 is connected to the emitter of the third transistor Q3. In addition, as Figure 4 As shown, the power capacitor CE3 is an energy storage capacitor, the coil L3 is a main coil, and the coil L2 is a secondary coil.

[0044] In some embodiments, when the kitchen appliance is in a burning state, the fourth transistor and the sixth transistor are turned on, and the fifth transistor and the third transistor are turned off.

[0045] like Figure 4 As shown, when the gas stove is burning normally, the bases of the fourth transistor Q4 and the sixth transistor Q6 are at a high level, and the fourth transistor Q4 and the sixth transistor Q6 are turned on. The power supply VDD charges the energy storage capacitor CE3. At this time, the base of the third transistor Q3 is at a high level, and the base of the fifth transistor Q5 is at a low level. The third transistor Q3 and the fifth transistor Q5 are both turned off. The main coil L3 is in a state of no current flowing, and the auxiliary coil L2 is maintained by the thermoelectric potential.

[0046] In some embodiments, when the kitchen appliance is in a power-off state, the fifth transistor and the third transistor are turned on, and the fourth transistor and the sixth transistor are turned off.

[0047] like Figure 4As shown, when the gas stove experiences a power outage, the power supply VDD is at 0, and the bases of the fourth transistor Q4 and the sixth transistor Q6 are at a low level, turning them off. At this point, the base of the fifth transistor Q5 is pulled up to a high level by the energy storage capacitor CE3 through the seventh resistor R7, turning the fifth transistor Q5 on. The base of the third transistor Q3 is connected to the negative electrode of the energy storage capacitor CE3 through the sixth resistor R6, and is now at a relatively low level, turning the third transistor Q3 on. This means that the energy storage capacitor CE3 is now directly connected to the main coil L3, charging the energy storage capacitor L3 and generating a greater repulsive force that closes the valve body.

[0048] In some embodiments, resistance values of the eighth resistor, the tenth resistor, the twelfth resistor, the thirteenth resistor, the seventh resistor, the eleventh resistor, the fifth resistor, and the sixth resistor are all determined based on a level of the power supply.

[0049] like Figure 4 As shown, Figure 4 The resistance values of the various resistors in the circuit need to be determined based on the voltage level of the power supply VDD. During normal power supply and power failure, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 are in corresponding open and closed states, while also minimizing the current of the entire signal. Typically, R5 = R8 = R11 = R12 = 1K, and R6 = R7 = R10 = R13 = 10K can be used. The various resistors in this embodiment are not necessarily required to be equal. The values used here are for reference only, primarily to ensure that the transistors maintain different open and closed states when powered on or off.

[0050] In some embodiments, the fourth diode is used to ensure that the third transistor is turned on in the power-off state. Figure 4 As shown, the fourth diode D4 is used to ensure that the third transistor Q3 can be turned on in the power-off state.

[0051] This embodiment provides a power-off and flameout protection circuit suitable for a dual-coil co-acting valve body, ensuring that a gas stove (or integrated stove) powered by a power adapter can be protected from power failure when the device is powered off, thereby eliminating safety hazards and improving the user experience.

[0052] Example 3:

[0053] The present invention provides a kitchen appliance. Figure 5 The structural diagram of a kitchen appliance shown is a kitchen appliance 100, which includes: the power-off and flameout protection circuit 200 provided in the above embodiment.

[0054] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the kitchen appliance described above can refer to the corresponding process in the aforementioned embodiment and will not be repeated here.

[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power failure flameout protection circuit, characterized in that: Applicable to a kitchen appliance, the kitchen appliance comprises: a main coil, a secondary coil and a thermocouple, the secondary coil being connected to the thermocouple; the power-off flameout protection circuit comprises: a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, and an energy storage circuit; The first switch circuit, the second switch circuit, the third switch circuit, the fourth switch circuit, and the energy storage circuit are all connected to a power supply, the second switch circuit is connected to the third switch circuit, the first switch circuit is connected to the fourth switch circuit, the third switch circuit and the fourth switch circuit are both connected to the energy storage circuit, and the third switch circuit and the fourth switch circuit are connected to the main coil; The first switch circuit is used to determine an on state or an off state based on the power supply; the second switch circuit is used to determine an on state or an off state based on the power supply; The third switch circuit is used to determine an on state or an off state based on the second switch circuit and the power supply; The fourth switch circuit is configured to determine an on state or an off state based on the first switch circuit and the power supply; The energy storage circuit is used to store or release electrical energy based on the power supply.

2. The power-off flameout protection circuit according to claim 1, characterized in that: When the kitchen appliance is in a burning state, the power supply is not 0, the first switch circuit and the second switch circuit are both in an open state, the energy storage circuit stores electrical energy, and the third switch circuit and the fourth switch circuit are in a closed state.

3. The power-off flameout protection circuit according to claim 1, characterized in that: When the kitchen appliance is in a power-off state, the power supply is 0, the first switch circuit and the second switch circuit are in a closed state, the third switch circuit and the fourth switch circuit are in an open state, and the energy storage circuit releases electrical energy.

4. The power-off flameout protection circuit according to any one of claims 1 to 3, characterized in that: The first switch circuit includes: an eighth resistor, a tenth resistor, and a fourth transistor; the base of the fourth transistor is connected to the eighth resistor, and the base of the fourth transistor, the tenth resistor, and the emitter of the fourth transistor are connected in sequence; The second switch circuit includes: a twelfth resistor, a thirteenth resistor, and a sixth transistor; the base of the sixth transistor is connected to the twelfth resistor, and the base of the sixth transistor, the thirteenth resistor, and the emitter of the sixth transistor are connected in sequence; The third switch circuit includes: a seventh resistor, an eleventh resistor and a fifth transistor; the base of the fifth transistor is connected to the eleventh resistor; the base of the fifth transistor is connected to the seventh resistor; The fourth switching circuit includes: a fifth resistor, a sixth resistor, a third transistor and a fourth diode; the base of the third transistor is connected to the fifth resistor; the base of the third transistor is connected to the sixth resistor, and the fourth diode is connected to the emitter of the third transistor.

5. The power-off flameout protection circuit according to claim 4, characterized in that: When the kitchen appliance is in a burning state, the fourth transistor and the sixth transistor are turned on, and the fifth transistor and the third transistor are turned off.

6. The power-off flameout protection circuit according to claim 4, characterized in that: When the kitchen appliance is in a power-off state, the fifth transistor and the third transistor are turned on, and the fourth transistor and the sixth transistor are turned off.

7. The power-off flameout protection circuit according to claim 4, characterized in that: The fourth diode is used to ensure that the third transistor is turned on in a power-off state.

8. The power-off flameout protection circuit according to claim 4, characterized in that: The resistance values of the eighth resistor, the tenth resistor, the twelfth resistor, the thirteenth resistor, the seventh resistor, the eleventh resistor, the fifth resistor, and the sixth resistor are all determined based on the level of the power supply.

9. The power failure and flameout protection circuit according to claim 1, characterized in that: The kitchen appliance includes a gas stove or an integrated stove with a double-coil solenoid valve.

10. A kitchen appliance, characterized in that: The kitchen appliance comprises the power-off and flameout protection circuit according to any one of claims 1 to 9.

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