Kettle lifting detection circuit and electric kettle

Abstract

The utility model discloses a kettle lifting detection circuit and an electric kettle. The kettle lifting detection circuit is provided with two voltage division circuits, and a thermistor is arranged in a kettle body of the electric kettle; when the electric kettle is in a lifting state, the voltage between the two voltage division circuits is a basic voltage division value; when the electric kettle is placed on the base, the thermistor and the first voltage division circuit or the second voltage division circuit form a parallel structure, so that the overall resistance value of the first voltage division circuit or the second voltage division circuit is influenced, and the basic voltage division value between the two voltage division circuits is changed; the control system of the electric kettle judges whether the kettle lifting action occurs or not by monitoring the change of the basic partial pressure value, the kettle lifting detection circuit is simple in design, and corresponding signals can be quickly transmitted to the control system of the electric kettle when the kettle lifting action occurs, so that the control system of the electric kettle can turn off the load.

Description

Technical Field

[0001] The present application relates to the technical field of liquid heating, and particularly to a kettle-lifting detection circuit and an electric kettle. Background Art

[0002] With the increasing improvement of people's living standards, the requirements for high-quality life for household appliances such as electric kettles are also getting higher and higher. Electric kettles are also developing towards the direction of multi-function and intelligence. Many electric kettle products on the market have the function of automatic water inlet, which avoids the operation of users frequently connecting water and brings a good experience to users.

[0003] Currently, many electric kettles on the market pump water from the bottom of the electric kettle. During the water pumping process, if the electric kettle is lifted, the water pump should immediately stop working, otherwise the water will overflow from the water pump, and the overflowed water will remain on the coupler. There is strong electricity on the coupler, so there is a risk of short circuit on the coupler. Therefore, it is very important to detect the lifting of the electric kettle and quickly turn off the corresponding load. Summary of the Utility Model

[0004] The purpose of the present application is to provide a kettle-lifting detection circuit and an electric kettle to solve the problem that the load cannot be turned off in time when the electric kettle makes a kettle-lifting action in the related art.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] In the first aspect, the present application provides a kettle-lifting detection circuit, including: a first voltage dividing circuit, a second voltage dividing circuit and a thermistor; the first end of the first voltage dividing circuit is connected to an external DC regulated power supply, and the second end of the first voltage dividing circuit is connected to the first end of the second voltage dividing circuit; the second end of the second voltage dividing circuit is grounded; the thermistor is arranged on the kettle body of the electric kettle. When the electric kettle is placed on the base, the thermistor forms a parallel connection with the first voltage dividing circuit or the second voltage dividing circuit.

[0007] Preferably, the first voltage dividing circuit includes: a first resistor; the first end of the first resistor is connected to an external DC regulated power supply, and the second end of the first resistor is connected to the first end of the second voltage dividing circuit.

[0008] Preferably, the second voltage dividing circuit includes: a second resistor; the first end of the second resistor is connected to the second end of the first voltage dividing circuit, and the second end of the second resistor is grounded.

[0009] Preferably, the thermistor includes: a positive temperature coefficient thermistor and a negative temperature coefficient thermistor.

[0010] Preferably, the kettle-lifting detection circuit further includes: a filtering circuit; the filtering circuit is disposed between the external AC power supply and the first voltage-dividing circuit, and the filtering circuit is used to filter out interference signals in the circuit.

[0011] Preferably, the filtering circuit includes: a first capacitor; a first end of the first capacitor is connected to the external AC power supply, and a second end of the first capacitor is grounded.

[0012] Preferably, the filtering circuit further includes: a third resistor; a first end of the third resistor is connected to the first end of the first capacitor, and a second end of the third resistor is connected to a common end of the first voltage-dividing circuit and the second voltage-dividing circuit.

[0013] Preferably, the kettle-lifting detection circuit further includes: a protection circuit; the protection circuit is disposed between the first voltage-dividing circuit and the thermistor, or the protection circuit is disposed between the second voltage-dividing circuit and the thermistor; the protection circuit is used for performing at least one of electrostatic protection, electromagnetic protection, and lightning protection on the kettle-lifting detection circuit.

[0014] Preferably, the protection circuit includes: a TVS diode; a first end of the TVS diode is connected to a second end of the second voltage-dividing circuit, a second end of the TVS diode is connected to the external DC regulated power supply, and a third end of the TVS diode is connected to a first end of the second voltage-dividing circuit.

[0015] In a second aspect, the present application further provides an electric kettle, including a kettle body and a base, and the electric kettle is provided with the above-mentioned kettle-lifting detection circuit.

[0016] A kettle-lifting detection circuit and an electric kettle provided by the present application. The kettle-lifting detection circuit can be applied to an electric kettle. Specifically, it can be applied to the base of the electric kettle. The kettle-lifting detection circuit is provided with two voltage-dividing circuits, and a thermistor is cleverly arranged on the kettle body of the electric kettle. When the electric kettle is in the lifted state, the voltage between the first voltage-dividing circuit and the second voltage-dividing circuit is the basic voltage-dividing value; when the electric kettle is placed on the base, the thermistor forms a parallel structure with the first voltage-dividing circuit or the second voltage-dividing circuit, thereby affecting the overall resistance value of the first voltage-dividing circuit or the second voltage-dividing circuit, and further affecting the voltage distribution between the first voltage-dividing circuit and the second voltage-dividing circuit, so that the basic voltage-dividing value between the first voltage-dividing circuit and the second voltage-dividing circuit changes. The control system of the electric kettle quickly determines whether the electric kettle has a kettle-lifting action by monitoring the basic voltage-dividing value. Compared with the prior art, the kettle-lifting detection circuit of the present application has a simple design and can quickly transmit a corresponding signal to the control system of the electric kettle when a kettle-lifting action occurs, so that the control system of the electric kettle shuts off the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a kettle-lifting detection circuit according to an embodiment of the present application;

[0018] Figure 2 It is a schematic structural diagram of another kettle-lifting detection circuit according to an embodiment of the present application;

[0019] Figure 3 It is a schematic structural diagram of yet another kettle-lifting detection circuit according to an embodiment of the present application;

[0020] Figure 4 It is a schematic structural diagram of yet another kettle-lifting detection circuit according to an embodiment of the present application;

[0021] Figure 5 It is a schematic structural diagram of the component composition of a kettle-lifting detection circuit according to an embodiment of the present application.

[0022] Description of reference numerals: 100, kettle-lifting detection circuit; 10, first voltage-dividing circuit; 20, second voltage-dividing circuit; 30, thermistor; 40, filtering circuit; 50, protection circuit; R10, first resistor; R16, second resistor; R12, third resistor; C5, first capacitor; D11, TVS diode; P1, coupler on the base; VSS, grounding terminal. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] In this application, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise clearly and specifically defined.

[0027] The terms used in one or more embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit one or more embodiments of this application. The singular forms of "a", "the", and "said" used in one or more embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] It should be understood that although terms such as first and second may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this application, the first can also be called the second, and similarly, the second can also be called the first. Depending on the context, the word "if" as used herein can be interpreted as "when" or "while".

[0030] Please refer to Figure 1 , an embodiment of this application provides a kettle detection circuit 100, including: a first voltage dividing circuit 10, a second voltage dividing circuit 20, and a thermistor 30;

[0031] The first end of the first voltage dividing circuit 10 is connected to an external DC regulated power supply, and the second end of the first voltage dividing circuit 10 is connected to the first end of the second voltage dividing circuit 20; the second end of the second voltage dividing circuit 20 is grounded;

[0032] It can be understood that the first voltage dividing circuit 10 and the second voltage dividing circuit 20 form a series structure. The first end of the first voltage dividing circuit 10 is connected to the external DC regulated power supply, and the second end of the second voltage dividing circuit 20 is grounded.

[0033] It should be noted that the voltage of the external DC regulated power supply can be selected according to actual situations, for example, 3.3V, 5V, etc.

[0034] The thermistor 30 is arranged on the kettle body of the electric kettle. When the electric kettle is placed on the base, the thermistor 30 is connected in parallel with the first voltage dividing circuit 10 or the second voltage dividing circuit 20.

[0035] It should be noted that the electric kettle includes electric kettles, constant temperature kettles, health kettles, coffee kettles and other electric kettle appliances.

[0036] Specifically, the thermistor 30 is arranged in the kettle body of the electric kettle. When the electric kettle is placed on the base and powered on, the thermistor 30 forms a parallel structure with the first voltage dividing circuit 10 or the second voltage dividing circuit 20.

[0037] In some alternative embodiments, taking the parallel structure formed by the thermistor 30 and the second voltage dividing circuit 20 as an example, the working principle is described as follows:

[0038] Specifically, when the kettle body of the electric kettle is not on the base, since the first voltage dividing circuit 10 and the second voltage dividing circuit 20 are in series, there is a basic voltage dividing value between the first voltage dividing circuit 10 and the second voltage dividing circuit 20. When the electric kettle is placed on the base, the thermistor 30 forms a parallel structure with the second voltage dividing circuit 20. Since the thermistor 30 forms a parallel structure with the second voltage dividing circuit 20, the overall resistance value of the second voltage dividing circuit 20 decreases. Correspondingly, the basic voltage dividing value between the first voltage dividing circuit 10 and the second voltage dividing circuit 20 will change. Furthermore, it can be determined whether the electric kettle has the action of lifting the kettle by whether the basic voltage dividing value changes.

[0039] Exemplarily, when the kettle body of the electric kettle is not on the base, that is, before the thermistor 30 is connected to the circuit, the voltages of the first voltage dividing circuit 10 and the second voltage dividing circuit 20 are both 5V. When the electric kettle is placed on the base, that is, the thermistor 30 is connected to the circuit and forms a parallel structure with the second voltage dividing circuit 20. Since the thermistor 30 is connected to the second voltage dividing circuit 20, the overall resistance value of the second voltage dividing circuit 20 decreases. With the overall voltage of the circuit remaining unchanged, correspondingly, the voltage on the second voltage dividing circuit 20 will necessarily be less than 5V, and the voltage on the first voltage dividing circuit 10 will necessarily be greater than 5V. Therefore, it is possible to determine whether the electric kettle has been lifted by monitoring the voltage value divided by the first voltage dividing circuit 10 or the second voltage dividing circuit 20.

[0040] A kettle-lifting detection circuit and an electric kettle provided by an embodiment of the present application. The kettle-lifting detection circuit 100 can be applied to the electric kettle. Specifically, it can be applied to the base of the electric kettle. The kettle-lifting detection circuit 100 is provided with two voltage dividing circuits and cleverly sets a thermistor 30 in the kettle body of the electric kettle. When the electric kettle is in the lifted state, the voltage between the first voltage dividing circuit 10 and the second voltage dividing circuit 20 is the basic voltage dividing value. When the electric kettle is placed on the base, the thermistor 30 forms a parallel structure with the first voltage dividing circuit 10 or the second voltage dividing circuit 20, thereby affecting the overall resistance value of the first voltage dividing circuit 10 or the second voltage dividing circuit 20, and further affecting the voltage distribution between the first voltage dividing circuit 10 and the second voltage dividing circuit 20, so that the basic voltage dividing value between the first voltage dividing circuit 10 and the second voltage dividing circuit 20 changes. The control system of the electric kettle quickly determines whether the electric kettle has been lifted by monitoring this basic voltage dividing value. Compared with the prior art, the kettle-lifting detection circuit of the present application has a simple design and can quickly transmit a corresponding signal to the control system of the electric kettle when the kettle-lifting action occurs, so that the control system of the electric kettle shuts off the load.

[0041] Please refer to Figure 2 , in some alternative embodiments, the first voltage dividing circuit 10 includes: a first resistor R10; the first end of the first resistor R10 is connected to an external DC regulated power supply, and the second end of the first resistor R10 is connected to the first end of the second voltage dividing circuit 20.

[0042] In some alternative embodiments, the second voltage dividing circuit 20 includes: a second resistor R16; the first end of the second resistor R16 is connected to the first voltage dividing circuit 10, and the second end of the second resistor R16 is grounded.

[0043] In this embodiment, both the first voltage dividing circuit 10 and the second voltage dividing circuit 20 are constructed in the form of resistors to form the voltage dividing circuit, and have the following effects:

[0044] 1. Maintain the original signal characteristics: Compared with the capacitor voltage divider circuit, the resistor voltage divider circuit has a smaller attenuation effect on the AC signal and can better maintain the characteristics of the original signal. This is because the attenuation effect of the resistor on the signal is relatively small. Therefore, in situations where the signal attenuation is required to be small, the resistor voltage divider circuit is a more appropriate choice.

[0045] 2. Low cost: The cost of the resistor voltage divider circuit is relatively low because resistors are common components in electronic circuits and are relatively cheap.

[0046] In some optional embodiments, the thermistor 30 includes: a thermistor with a positive temperature coefficient and a thermistor with a negative temperature coefficient.

[0047] For example, when the thermistor 30 is a positive temperature coefficient thermistor, when the kettle body of the electric kettle is not on the base, the first resistor R10 and the second resistor R16 form a series voltage-dividing circuit structure, for example, the voltage on the first resistor R10 is 3V, and the voltage on the second resistor R16 is 5V. When the electric kettle is placed on the base, the thermistor 30 and the second resistor R16 form a parallel structure, then at this time, the voltage of the second resistor R16 will inevitably be less than 5V, so that by detecting the voltage-dividing value on the second resistor R16, it can be determined whether the user has lifted the kettle.

[0048] See also Figure 3 In some optional embodiments, the kettle detection circuit 100 further includes: a filter circuit 40, wherein the filter circuit 40 is arranged between the AC power supply and the first voltage divider circuit 10, and the filter circuit 40 is used to filter out interference signals in the circuit.

[0049] Specifically, in order to prevent the ripple and noise output from the AC power supply from affecting the kettle detection circuit 100 , in this example, a filter circuit 40 is used to filter out the ripple and noise in the AC power supply.

[0050] See also Figure 4 In some optional embodiments, the filter circuit 40 includes: a first capacitor C5; a first end of the first capacitor C5 is connected to the output end of the AC power supply, and a second end of the first capacitor C5 is grounded.

[0051] In this embodiment, the kettle detection circuit 100 has the following effects by using a capacitor to construct the filter circuit 40:

[0052] 1. Reduce AC ripple voltage: The first capacitor C5 can effectively reduce the AC ripple voltage (ripple factor), thereby improving the smoothness of the DC output.

[0053] 2. Filter out noise: Filter out various interference signals in the kettle detection circuit 100 to ensure the stability and reliability of the kettle detection circuit 100.

[0054] In some alternative embodiments, the filter circuit 40 further includes: a third resistor R12, a first end of the third resistor R12 is connected to a first end of the first capacitor C5, and a second end of the third resistor R12 is connected to a common end of the first voltage dividing circuit 10 and the second voltage dividing circuit 20.

[0055] In this embodiment, by adopting the form of a resistor in parallel with a capacitor, a low-pass filter is formed, so as to filter out high-frequency signals in the AC power supply signal, thereby making the AC power supply signal smoother.

[0056] Please refer to Figure 4 , in some alternative embodiments, the kettle detection circuit 100 further includes: a protection circuit 50, the protection circuit 50 is disposed between the first voltage dividing circuit 10 and the thermistor 30, or the protection circuit 50 is disposed between the second voltage dividing circuit 20 and the thermistor 30; the protection circuit 50 is used for performing at least one of electrostatic protection, electromagnetic protection, and lightning protection on the kettle detection circuit 100.

[0057] In this embodiment, the kettle detection circuit 100 is provided with a protection circuit 50 to avoid excessive voltage or current in the circuit from damaging the components in the circuit.

[0058] Please refer to Figure 5 , in some alternative embodiments, the protection circuit 50 includes: a TVS diode D11; a first end of the TVS diode D11 is connected to a second end of the second voltage dividing circuit 20, a second end of the TVS diode D11 is connected to the external DC regulated power supply, and a third end of the TVS diode D11 is connected to a first end of the second voltage dividing circuit 20.

[0059] It should be noted that the TVS diode is short for Transient Voltage Suppressor Diode, which is an overvoltage protection device with bidirectional voltage regulation characteristics and bidirectional negative resistance characteristics. It can be used to suppress instantaneous overvoltage. When a surge pulse voltage appears instantaneously in the protected circuit, the bidirectional breakdown diode can quickly break down in a Zener manner, changing from a high-resistance state to a low-resistance state, shunting and clamping the surge voltage, thereby protecting the components in the circuit from being damaged by the instantaneous surge pulse voltage.

[0060] In Figure 5Among them, R10 is the first resistor, R16 is the second resistor, R10 forms the first voltage dividing circuit 10, R16 forms the second voltage dividing circuit 20, R12 is the third resistor, C5 is the first capacitor, R12 and C5 form the filtering circuit 40, D11 is the TVS diode, P1 is the coupler on the base, and VSS is the grounding terminal.

[0061] In this embodiment, a protection circuit is constructed by using a TVS (Transient Voltage Suppression) diode. The TVS (Transient Voltage Suppression) diode can quickly conduct when the voltage or current in the kettle detection circuit 100 undergoes an instantaneous change (suddenly increases), and divert the excess energy of the circuit from the sensitive circuit path, thereby protecting the electronic components in the circuit from damage.

[0062] The embodiment of the present application also provides an electric kettle, including a kettle body and a base, and the electric kettle is provided with the above-mentioned kettle detection circuit 100.

[0063] Exemplarily, the first voltage dividing circuit 10 and the second voltage dividing circuit 20 can be arranged on the base of the electric kettle.

[0064] In all the examples shown and described here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0065] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0066] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all of them should be covered within the protection scope of the present application.

Claims

1. A kettle detection circuit, characterized in that: include: A first voltage divider circuit, a second voltage divider circuit and a thermistor; A first end of the first voltage divider circuit is connected to an external DC regulated power supply, and a second end of the first voltage divider circuit is connected to a first end of the second voltage divider circuit; The second end of the second voltage divider circuit is grounded; The thermistor is arranged on the kettle body of the electric kettle. When the kettle body of the electric kettle is placed on the base, the thermistor is connected in parallel with the first voltage divider circuit or the second voltage divider circuit.

2. The kettle detection circuit according to claim 1, characterized in that: The first voltage-dividing circuit includes: a first resistor; a first end of the first resistor is connected to an external DC regulated power supply, and a second end of the first resistor is connected to a first end of the second voltage-dividing circuit.

3. The kettle detection circuit according to claim 1, characterized in that: The second voltage-dividing circuit includes: a second resistor; a first end of the second resistor is connected to a second end of the first voltage-dividing circuit, and a second end of the second resistor is grounded.

4. The kettle detection circuit according to claim 1, characterized in that: The thermistors include: a thermistor with a positive temperature coefficient and a thermistor with a negative temperature coefficient.

5. The kettle detection circuit according to claim 1, characterized in that: The kettle detection circuit further includes: a filter circuit; the filter circuit is arranged between the external AC power supply and the first voltage divider circuit, and the filter circuit is used to filter out interference signals in the circuit.

6. The kettle detection circuit according to claim 5, characterized in that: The filter circuit includes: a first capacitor; a first end of the first capacitor is connected to an external AC power source, and a second end of the first capacitor is grounded.

7. The kettle detection circuit according to claim 6, characterized in that: The filter circuit further includes: a third resistor; a first end of the third resistor is connected to the first end of the first capacitor, and a second end of the third resistor is connected to a common end of the first voltage divider circuit and the second voltage divider circuit.

8. The kettle detection circuit according to any one of claims 1 to 7, characterized in that: The kettle lifting detection circuit also includes: a protection circuit; the protection circuit is arranged between the first voltage divider circuit and the thermistor, or the protection circuit is arranged between the second voltage divider circuit and the thermistor; the protection circuit is used to perform at least one of electrostatic protection, electromagnetic protection and lightning protection on the kettle lifting detection circuit.

9. The kettle detection circuit according to claim 8, characterized in that: The protection circuit includes: a TVS diode; a first end of the TVS diode is connected to the second end of the second voltage divider circuit, a second end of the TVS diode is connected to the external DC regulated power supply, and a third end of the TVS diode is connected to the first end of the second voltage divider circuit.

10. An electric kettle, characterized in that: The electric kettle comprises a kettle body and a base, and is provided with a kettle lifting detection circuit as claimed in any one of claims 1 to 9.

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