Electromagnetic valve detection circuit and cooktop

Abstract

The application discloses an electromagnetic valve detection circuit and a cooking appliance. The electromagnetic valve detection circuit comprises a power module provided with a voltage output end, wherein the voltage output end is sequentially grounded through a voltage dividing resistor and a secondary coil of a double-coil electromagnetic valve; and a controller provided with a voltage detection end, wherein the voltage detection end is connected between the voltage dividing resistor and the secondary coil. In this way, when the controller detects a high level, it indicates that the secondary coil of the double-coil electromagnetic valve has been damaged, the controller cannot be directly grounded, and the voltage of the power module is detected instead. Therefore, a user can determine whether the secondary coil of the double-coil electromagnetic valve is damaged by the high and low level signals detected by the controller. When the secondary coil of the double-coil electromagnetic valve has been damaged, the user can manually close the double-coil electromagnetic valve, so that a fire can be avoided, and the use safety of the user is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas valves, in particular to an electromagnetic valve detection circuit and a cooking appliance. BACKGROUND

[0002] Currently, the gas valve of a cooking appliance usually adopts an electromagnetic valve. The electromagnetic valve has an auxiliary ignition power supply. When a user presses an ignition switch, the auxiliary ignition power supply supplies power to the electromagnetic valve, so that the electromagnetic valve attracts an iron sheet, and a gas path is conducted. When a thermocouple generates sufficient voltage to supply power to the electromagnetic valve due to sufficient temperature difference, the auxiliary ignition power supply is turned off and no longer supplies power to the electromagnetic valve.

[0003] In some new cooking appliances with timing and dry burning prevention functions, a gas valve usually adopts a double-coil electromagnetic valve. The valve closing of the double-coil electromagnetic valve is achieved by adding a current in the opposite direction to the attraction and maintenance current in the auxiliary coil, and by the magnetic field to make the main coil generate a reverse current to offset the current generated by the thermocouple, so that the valve body is separated, thereby realizing automatic valve closing.

[0004] For the double-coil electromagnetic valve, if the auxiliary coil of the double-coil electromagnetic valve is damaged during use, and the user does not know it, once the timing time is reached or the dry burning prevention function is started, the valve body cannot be controlled to separate from the main coil due to the damage of the auxiliary coil, so automatic valve closing cannot be realized.

[0005] Therefore, in the prior art, the user cannot know whether the auxiliary coil of the electromagnetic valve is damaged, which may cause a fire and seriously endanger the user's safety. SUMMARY

[0006] Therefore, the embodiments of the present application solve the problem in the prior art that the user cannot know whether the auxiliary coil of the electromagnetic valve is damaged, thereby providing a new electromagnetic valve detection circuit and a cooking appliance.

[0007] To achieve the above-mentioned purpose, the embodiments of the present application provide an electromagnetic valve detection circuit, which comprises:

[0008] A power supply module is provided with a voltage output end, and the voltage output end is connected to the ground through a voltage dividing resistor and an auxiliary coil of a double-coil electromagnetic valve in sequence.

[0009] A controller is provided with a voltage detection end, and the voltage detection end is connected between the voltage dividing resistor and the auxiliary coil.

[0010] Optionally, the electromagnetic valve detection circuit further comprises:

[0011] A current limiting resistor, one end of the current limiting resistor is connected to the voltage detection end, and the other end of the current limiting resistor is connected between the voltage dividing resistor and the auxiliary coil.

[0012] Optionally, the electromagnetic valve detection circuit further comprises:

[0013] A current increasing module, which is internally provided with a switching circuit;

[0014] Under the action of the switching circuit, the current increasing module has a state of being connected in parallel with the voltage dividing resistor; after the current increasing module is connected in parallel with the voltage dividing resistor, the current flowing through the secondary coil becomes larger, and the double-coil electromagnetic valve is closed.

[0015] Optionally, under the action of the switching circuit, the current increasing module further has a state of being disconnected from the circuit, and the current only flows through the voltage dividing resistor, so that the current flowing through the secondary coil becomes smaller, and the double-coil electromagnetic valve cannot be closed.

[0016] Optionally, the current increasing module comprises:

[0017] A current increasing resistor, one end of the current increasing resistor is connected with the voltage output end through the switching circuit, and the other end of the current increasing resistor is connected between the voltage dividing resistor and the secondary coil; the resistance value of the current increasing resistor is much smaller than the resistance value of the voltage dividing resistor.

[0018] Optionally, the switching circuit is a switching tube, the control end of the switching tube is connected with the signal output end of the controller, the first end of the switching tube is connected with the power module, and the second end of the switching tube is connected to between the voltage dividing resistor and the secondary coil through the current increasing resistor.

[0019] Optionally, the current increasing module further comprises:

[0020] A first resistor, one end of the first resistor is connected with the voltage output end, and the other end of the first resistor is sequentially connected with the voltage dividing resistor and the secondary coil of the double-coil electromagnetic valve and grounded.

[0021] Optionally, the current increasing module further comprises: a second resistor, the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is sequentially connected with the voltage dividing resistor and the secondary coil of the double-coil electromagnetic valve and grounded.

[0022] Optionally, the current increasing module further comprises:

[0023] A first filtering module, which is connected in parallel with the circuit connected in series with the voltage dividing resistor and the secondary coil;

[0024] Optionally, the current increasing module further comprises:

[0025] A second filtering module, which is connected in parallel with the secondary coil.

[0026] The embodiment of the application provides a stove, which comprises the electromagnetic valve detection circuit in any one of the above embodiments.

[0027] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0028] 1. The electromagnetic valve detection circuit provided by the embodiment of the present application comprises: a power module, provided with a voltage output end, the voltage output end being connected to the ground through a secondary coil of a double-coil electromagnetic valve and a voltage dividing resistor in sequence; and a controller, provided with a voltage detection end, the voltage detection end being connected between the voltage dividing resistor and the secondary coil.

[0029] In this way, when the controller detects a low level, it indicates that the secondary coil of the electromagnetic valve is normally conductive, so that the controller is directly grounded. When the controller detects a high level, it indicates that the secondary coil of the double-coil electromagnetic valve is damaged, so that the controller cannot be directly grounded, and instead, the voltage of the power module is detected. Therefore, the user can determine whether the secondary coil of the double-coil electromagnetic valve is damaged by the high and low level signals detected by the controller. When the secondary coil of the double-coil electromagnetic valve is damaged, the user can manually turn off the double-coil electromagnetic valve, so that the occurrence of a fire can be avoided, and the safety of the user can be ensured.

[0030] 2. When the controller detects a low level, it indicates that the secondary coil of the double-coil electromagnetic valve is normally working. In the embodiment of the present application, a signal output end and a feedback end are arranged on the controller. When the range hood reaches the timing time or has reached the time for preventing dry burning, the controller directly controls the signal output end to output a control signal, so that the switching tube is closed, and the current increasing module is connected to the circuit, so that the current passing through the secondary coil of the double-coil electromagnetic valve can be increased, and the electromagnetic valve can be normally closed, so that the occurrence of a fire can be avoided, and the safety of the user can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the specific embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 The figure is a structural diagram of the electromagnetic valve detection circuit of the embodiment of the present application.

[0033] Reference signs:

[0034] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, current increasing resistor; R6, current limiting resistor; R7, voltage dividing resistor; C1, first filter module; C2, second filter module; Q1, switching tube. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements; it can be wireless connection, or wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0039] At present, the gas valve of the cooking appliance usually adopts a solenoid valve. The solenoid valve has an auxiliary ignition power supply. When the user presses the ignition switch, the auxiliary ignition power supply supplies power to the solenoid valve, so that the solenoid valve attracts the iron sheet, and the gas path is conducted. When the thermocouple has sufficient temperature difference to generate sufficient voltage to supply power to the solenoid valve, the auxiliary ignition power supply is turned off and no longer supplies power to the solenoid valve.

[0040] In some new cooking appliances with timing and dry burning prevention, the gas valve usually adopts a double-coil solenoid valve. The valve closing of the double-coil solenoid valve is achieved by adding a current in the opposite direction of the attraction and maintenance current in the auxiliary coil, and through the magnetic field to make the main coil generate a reverse current which offsets the current generated by the thermocouple, so that the valve body is separated, thereby realizing automatic valve closing.

[0041] For the double-coil electromagnetic valve, if the auxiliary coil of the double-coil electromagnetic valve is damaged during use, and the user does not know, once the timing time is reached or the anti-dry burning function is started, the main coil cannot control the valve body to be separated due to the damage of the auxiliary coil, so the automatic valve closing cannot be realized.

[0042] Therefore, in the prior art, the user cannot know whether the auxiliary coil of the electromagnetic valve is damaged, which may cause a fire and seriously endanger the use safety of the user.

[0043] The embodiment of the present application is to solve the problem that the user cannot know whether the auxiliary coil of the electromagnetic valve is damaged in the prior art, thereby providing a new electromagnetic valve detection circuit and a cooking appliance.

[0044] Embodiment 1

[0045] As shown in Figure 1 The embodiment of the present application provides an electromagnetic valve detection circuit, which comprises a power supply module and a controller.

[0046] Specifically, in the embodiment of the present application, the power supply module is provided with a voltage output end, which is sequentially grounded through a voltage dividing resistor R7 and an auxiliary coil of a double-coil electromagnetic valve. The controller is provided with a voltage detection end, which is connected between the voltage dividing resistor R7 and the auxiliary coil. As shown in Figure 1 The voltage detection end is an IO port 2 of the controller.

[0047] In actual working process, when the cooking appliance is ignited by electric ignition and is in normal working state, the voltage dividing resistor R7 and the auxiliary coil generate a voltage division, and the voltage divided by the auxiliary coil enters the voltage detection end. Since the auxiliary coil is grounded, the voltage detection end actually detects a low level. At this time, the controller can judge whether the electromagnetic valve is disconnected according to the voltage value divided by the auxiliary coil.

[0048] Suppose that the electromagnetic valve is disconnected, that is, the auxiliary coil is damaged, then the auxiliary coil is in a disconnected state, there is no loop in the circuit, and the voltage dividing resistor R7 does not divide voltage with the auxiliary coil. At this time, the voltage detection end detects a voltage of the power supply module, that is, a higher level. In this way, it can be judged that the electromagnetic valve is disconnected, thereby realizing the electromagnetic valve detection.

[0049] In this way, when the controller detects a low level, it indicates that the auxiliary coil of the electromagnetic valve is normally turned on, so that the controller is directly grounded; when the controller detects a high level, it indicates that the auxiliary coil of the double-coil electromagnetic valve has been damaged, and the controller cannot be directly grounded, and instead detects the voltage of the power module. Therefore, the user can determine whether the auxiliary coil of the double-coil electromagnetic valve is damaged by the high and low level signals detected by the controller. When the auxiliary coil of the double-coil electromagnetic valve has been damaged, the user can manually turn off the double-coil electromagnetic valve, thereby avoiding the occurrence of a fire and ensuring the safety of the user.

[0050] Further, in an optional embodiment of the present application, the electromagnetic valve detection circuit further comprises a current-limiting resistor R6, one end of the current-limiting resistor R6 is connected with the voltage detection end, and the other end of the current-limiting resistor R6 is connected between the voltage dividing resistor R7 and the auxiliary coil.

[0051] Further, in an optional embodiment of the present application, the electromagnetic valve detection circuit further comprises: a current-increasing module, the current-increasing module is internally provided with a switching circuit; under the action of the switching circuit, the current-increasing module has a state of being connected in parallel with the voltage dividing resistor R7; after the current-increasing module is connected in parallel with the voltage dividing resistor R7, the current flowing through the auxiliary coil becomes larger, and the double-coil electromagnetic valve is closed. And, under the action of the switching circuit, the current-increasing module also has a state of being disconnected from the access circuit, and the current only flows through the voltage dividing resistor R7, so that the current flowing through the auxiliary coil becomes smaller, and the double-coil electromagnetic valve cannot be closed.

[0052] Specifically, the current-increasing module comprises a current-increasing resistor R5, one end of the current-increasing resistor R5 is connected with the voltage output end through the switching circuit, and the other end of the current-increasing resistor R5 is connected between the voltage dividing resistor R7 and the auxiliary coil. The resistance value of the current-increasing resistor R5 is much smaller than the resistance value of the voltage dividing resistor R7.

[0053] Further, the switching circuit can be a switching tube Q1, the control end of the switching tube Q1 is connected with the signal output end of the controller through a third resistor R3, the first end of the switching tube Q1 is connected with the power module, the second end of the switching tube Q1 is connected to between the voltage dividing resistor R7 and the auxiliary coil through the current-increasing resistor R5, and the fourth resistor R4 is connected between the first end of the switching tube Q1 and the second end of the switching tube Q1. As shown in the figure, the signal output end is the controller I O port 1. And, the switching tube Q1 can be a triode or a MOS tube, and those skilled in the art can change it according to the actual situation, as long as it can have the same technical effect. Figure 1

[0054] ​When the controller detects a low level, it indicates that the auxiliary coil of the electric double-coil electromagnetic valve is working normally. In the embodiment of the application, a signal output end and a feedback end are arranged on the controller. When the cooking appliance reaches the timing time or has reached the time for preventing dry burning, the controller directly controls the signal output end to output a control signal, so that the switching tube Q1 is closed, so that the current flowing through the auxiliary coil of the double-coil electromagnetic valve is increased, and the electromagnetic valve is normally closed, thereby avoiding the occurrence of a fire and ensuring the safety of the user.

[0055] Further, in an optional embodiment of the application, the current increasing module further comprises a first resistor R1, a second resistor R2, a first filter module C1 and a second filter module C2. One end of the first resistor R1 is connected with the voltage output end, and the other end of the first resistor R1 is grounded through the auxiliary coil of the double-coil electromagnetic valve and a voltage dividing resistor R7 in sequence. The first end of the second resistor R2 is connected with the second end of the first resistor R1, and the second end of the second resistor R2 is grounded through the auxiliary coil of the double-coil electromagnetic valve and the voltage dividing resistor R7 in sequence. The first filter module C1 is connected in parallel with the circuit obtained by connecting the voltage dividing resistor R7 and the auxiliary coil in series. The second filter module C2 is connected in parallel with the auxiliary coil. The first filter module C1 and the second filter module C2 can both be capacitors. When the second filter module C2 is arranged, the current limiting resistor R6 is used to absorb the electric energy of the capacitor in the second filter module C2, so as to prevent the discharge current of the capacitor from being too large and to avoid damaging the electromagnetic valve connected in parallel with the capacitor.

[0056] When the cooking appliance is working normally, if the controller I / O port outputs a high level, the switching tube Q1 will be closed, and the current will flow from the power module to the ground through the first resistor R1, the second resistor R2, the voltage dividing resistor R7 and the electromagnetic valve in sequence. Since the voltage dividing resistor R7 has a large resistance value, the current flowing through the electromagnetic valve has a small value, and the valve body cannot be closed.

[0057] When the first filter module C1 and the first resistor R1 are arranged at the same time, the capacitor of the first filter module C1 prevents voltage from suddenly changing and absorbs the overvoltage in the peak state, and the first resistor R1 in series plays a damping role and consumes the energy of the overvoltage. Generally, the first filter module C1 and the first resistor R1 are combined for use to suppress circuit oscillation. Of course, the first filter module C1 and the first resistor R1 can also not be arranged at the same time according to actual conditions.

[0058] The embodiment of the application provides a cooking appliance, which comprises the electromagnetic valve detection circuit described in any one of the above embodiments.

[0059] In this way, when the controller detects a low level, it indicates that the auxiliary coil of the electromagnetic valve is normally turned on, so that the controller is directly grounded; when the controller detects a high level, it indicates that the auxiliary coil of the double-coil electromagnetic valve has been damaged, the controller cannot be directly grounded, and instead the voltage of the power module is detected. Therefore, the user can determine whether the auxiliary coil of the double-coil electromagnetic valve is damaged by the high and low level signals detected by the controller. When the auxiliary coil of the double-coil electromagnetic valve has been damaged, the user can manually close the double-coil electromagnetic valve, thereby avoiding the occurrence of a fire and ensuring the safety of the user.

[0060] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An electromagnetic valve detection circuit characterized by comprising: It comprises: a power module provided with a voltage output end, which is connected to the auxiliary coil of the double-coil electromagnetic valve through a voltage dividing resistor (R7) in sequence and grounded; a controller provided with a voltage detection end, which is connected between the voltage dividing resistor (R7) and the auxiliary coil; a current increasing module, which is internally provided with a switching circuit; under the action of the switching circuit, the current increasing module has a state of being connected in parallel with the voltage dividing resistor (R7); after the current increasing module is connected in parallel with the voltage dividing resistor (R7), the current flowing through the auxiliary coil becomes larger, and the double-coil electromagnetic valve is closed; the current increasing module comprises: a current increasing resistor (R5), one end of which is connected to the voltage output end through the switching circuit, and the other end of which is connected between the voltage dividing resistor (R7) and the auxiliary coil; the resistance value of the current increasing resistor (R5) is smaller than that of the voltage dividing resistor (R7); the switching circuit is a switching tube (Q1), the control end of which is connected to the signal output end of the controller, the first end of which is connected to the power module, and the second end of which is connected to the voltage dividing resistor (R7) and the auxiliary coil through the current increasing resistor (R5); when the cooking appliance reaches the timing time or has reached the time of preventing dry burning, the controller controls the signal output end to output a control signal, so that the switching tube (Q1) is closed, the current increasing module is connected to the circuit, the current flowing through the auxiliary coil is increased, and the double-coil electromagnetic valve is closed.

2. The solenoid valve test circuit of claim 1, wherein It further comprises: a current limiting resistor (R6), one end of which is connected to the voltage detection end, and the other end of which is connected between the voltage dividing resistor (R7) and the auxiliary coil.

3. The solenoid valve detection circuit according to claim 1 or 2, characterized by under the action of the switching circuit, the current increasing module also has a state of being disconnected from the circuit, and the current only flows through the voltage dividing resistor (R7), so that the current flowing through the auxiliary coil becomes smaller, and the double-coil electromagnetic valve cannot be closed.

4. The solenoid valve test circuit of claim 3, wherein It further comprises: a first resistor (R1), the first end of which is connected to the voltage output end, and the second end of which is connected to the auxiliary coil of the double-coil electromagnetic valve through the voltage dividing resistor (R7) in sequence.

5. The solenoid valve test circuit of claim 4, wherein It further comprises: a second resistor (R2), the first end of which is connected to the second end of the first resistor (R1), and the second end of which is connected to the auxiliary coil of the double-coil electromagnetic valve through the voltage dividing resistor (R7) in sequence.

6. The solenoid valve detection circuit according to claim 4 or 5, characterized in that, It further comprises: a first filter module (C1), which is connected in parallel with the circuit connected in series with the voltage dividing resistor (R7) and the auxiliary coil.

7. The solenoid valve test circuit according to claim 4 or 5, wherein It further comprises: a second filter module (C2), which is connected in parallel with the auxiliary coil.

8. A hob, characterized in that It comprises: the electromagnetic valve detection circuit according to any one of claims 1 to 7.

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