NTC (Negative Temperature Coefficient) non-contact electric kettle

Abstract

The utility model provides an NTC non-contact type electric kettle. The NTC non-contact type electric kettle comprises a heating disc and a kettle body capable of being placed on the heating disc for heating. A sensor is arranged on the inner side face of the heating disc. The detection circuit is arranged in the heating disc and comprises a temperature detection circuit and a liquid level detection circuit; the temperature detection circuit and the liquid level detection circuit are respectively and electrically connected with one terminal of the sensor; the control circuit board is used for controlling the heating power of the heating disc so as to prevent the kettle body from being damaged due to dry burning in the heating process of the kettle body, and the control circuit board is arranged in the heating disc and electrically connected with the temperature detection circuit and the liquid level detection circuit; when the kettle body is placed on the heating disc, the sensor transmits the detected actual heating temperature and liquid level of the kettle body to the control circuit board.

Description

Technical Field

[0001] The present application relates to the technical field of electric kettles, and in particular to an NTC non-contact electric kettle. Background Art

[0002] An electric kettle is an electrical appliance that heats drinking water or beverages to a drinkable state. It is generally used in hotels, guest rooms, homes, etc. as an electric water boiler for guests to boil water by themselves. It usually has a split power base and an automatic switch when the water boils.

[0003] Existing electric kettles usually do not have an anti-dumping function during use, which causes the electric kettle to easily tip over when touched by foreign objects, causing hot water to flow everywhere, which can easily create a safety hazard. In addition, due to the single structure, the liquid level of the hot water inside the electric kettle cannot be monitored in real time, reducing the applicability of the electric kettle.

[0004] In addition, there are many types of liquid level sensors currently used in the market, including float type, photoelectric type, capacitive type, ultrasonic type, etc., each of which has its own advantages and disadvantages. Any object has capacitance, and the capacitance is related to the dielectric constant and volume size. The liquid level sensor determines the height of the liquid or the presence of liquid by detecting changes in the capacitance of the object. After the liquid level sensor is placed close to the container wall, a capacitor similar to parallel plates is formed between it and the liquid. The capacitance value of this capacitor is affected by the interaction area between the liquid and the sensor and the dielectric constant of the container wall. Utility Model Content

[0005] In order to solve the above technical problems, the present application proposes an NTC non-contact electric kettle, comprising:

[0006] A heating plate and a kettle body that can be placed on the heating plate for heating; a sensor is provided on the inner side of the heating plate;

[0007] A detection circuit is arranged inside the heating plate, and the detection circuit includes a temperature detection circuit and a liquid level detection circuit; the temperature detection circuit and the liquid level detection circuit are electrically connected to one of the wiring terminals of the sensor respectively;

[0008] A control circuit board for controlling the heating power of the heating plate to prevent the kettle body from being damaged by dry burning during the heating process. The control circuit board is arranged in the heating plate and is electrically connected to the temperature detection circuit and the liquid level detection circuit;

[0009] When the kettle body is placed on the heating plate, the sensor transmits the actual heating temperature and liquid level of the kettle body detected to the control circuit board.

[0010] Through the above technical solution, the detection signal transmitted by the sensor is transmitted to the control circuit board through the liquid level detection circuit and the temperature detection circuit to monitor the temperature and liquid level of the liquid in the kettle to avoid dry burning.

[0011] The present application is further configured so that the sensor does not contact the liquid in the kettle body, and when the kettle body is placed on a heating plate for heating, the sensor contacts the outer side wall of the lower end of the kettle body.

[0012] Through the above technical solution, the liquid level changes in the kettle body can be effectively detected, the structure is simple, the reliability is high, the cost is low, and it is easy to mass produce.

[0013] The present application is further configured such that an MCU / logic processing unit is provided in the liquid level detection circuit; the liquid level detection circuit is connected to the MCU / logic processing unit to provide corresponding sensor capacitance change data or signal quantity, and the MCU / logic processing unit transmits the processed information to the control circuit board.

[0014] The present application is further configured that the sensor includes: a conductive metal sheet, a spring, a conductive tape, a conductive cotton or a thermistor.

[0015] The present application is further configured that the kettle body is made of insulating dielectric materials, including glass and plastic glass.

[0016] The present application is further configured such that the control circuit board includes a power supply circuit connected to an external alternating current AC, a power regulator and a main control circuit for adjusting the heating power of the heating plate through the power regulator according to the actual heating temperature inside the kettle body, and the heating plate is connected in series with the power regulator and then connected to the output end of the power supply circuit.

[0017] The present application is further configured such that the main control circuit includes a single-chip microcomputer; the power regulator is a thyristor, and the control end of the thyristor is connected to one of the control ports of the single-chip microcomputer.

[0018] The beneficial effects of the present application are as follows: since a sensor is provided at the lower end of the kettle body, and the sensor is connected in series with a detection circuit, the liquid level and temperature in the kettle body are detected, thereby avoiding dry burning; and the technical solution does not require the addition of additional sensors, and the existing NTC can be directly used as a sensor, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present application. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.

[0020] Figure 1 is a schematic structural diagram of an NTC non-contact electric kettle according to an embodiment of the present application;

[0021] Figure 2 It is a principle block diagram of a control circuit board of an NTC non-contact electric kettle according to an embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of a liquid level detection circuit of an NTC non-contact electric kettle according to an embodiment of the present application.

[0023] The meaning of the numbers in the figure:

[0024] 1. Kettle body; 2. Heating plate; 3. Sensor; 4. Liquid level detection chip; 5. Liquid level detection circuit; 6. MCU; 7. Control circuit board; 8. Power supply circuit; 9. Main control circuit; 10. Power regulator; 11. Temperature controller. DETAILED DESCRIPTION

[0025] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description and are shown by illustrative specific embodiments in which the present application can be practiced. To this end, directional terms, such as "top", "bottom", "left", "right", "up", "down", etc., are used with reference to the orientation of the figures described. Because the components of the embodiments can be positioned in several different orientations, directional terms are used for the purpose of illustration and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present application. Therefore, the following detailed description should not be adopted in a limiting sense, and the scope of the present application is defined by the appended claims.

[0026] Figure 1 is a schematic diagram of the structure of an NTC non-contact electric kettle according to an embodiment of the present application, such as Figure 1 As shown, an NTC non-contact electric kettle comprises:

[0027] A heating plate 2 and a kettle body 1 which can be placed on the heating plate 2 for heating; a sensor 3 is provided on the inner side of the heating plate 2;

[0028] The detection circuit is arranged inside the heating plate 2, and the detection circuit includes a temperature detection circuit and a liquid level detection circuit 5; the temperature detection circuit and the liquid level detection circuit 5 are respectively electrically connected to one of the terminals of the sensor 3;

[0029] A control circuit board 7 for controlling the heating power of the heating plate 2 to prevent the kettle body 1 from being damaged by dry burning during the heating process. The control circuit board 7 is arranged in the heating plate 2 and is electrically connected to the temperature detection circuit and the liquid level detection circuit;

[0030] When the kettle body 1 is placed on the heating plate 2 , the sensor 3 transmits the detected actual heating temperature and liquid level of the kettle body 1 to the control circuit board 7 .

[0031] The sensor 3 does not contact the liquid in the kettle body 1 , and when the kettle body 1 is placed on the heating plate 2 for heating, the sensor 3 contacts the outer side wall of the lower end of the kettle body 1 .

[0032] Figure 3 is a schematic diagram of a liquid level detection circuit of an NTC non-contact electric kettle according to an embodiment of the present application, such as Figure 3 As shown, the liquid level detection circuit 5 is provided with an MCU6 / logic processing unit; the liquid level detection circuit 5 is connected to the MCU6 / logic processing unit, providing the corresponding sensor 3 capacitance change data or signal quantity, and the MCU6 / logic processing unit transmits the processed information to the control circuit board 7.

[0033] Meanwhile, the sensor 3 includes: a conductive metal sheet, a spring, a conductive tape, a conductive cotton or a thermistor.

[0034] Figure 2 : is a principle block diagram of a control circuit board of an NTC non-contact electric kettle according to an embodiment of the present application, such as Figure 2 As shown, the control circuit board 7 includes a power supply circuit 8 connected to the external alternating current AC, a power regulator 10 and a main control circuit 9 for adjusting the heating power of the heating plate 2 through the power regulator 10 according to the actual heating temperature in the kettle body 1. The heating plate 2 is connected in series with the power regulator 10 and then connected to the output end of the power supply circuit 8.

[0035] The main control circuit 9 includes a single chip microcomputer; the power regulator 10 is a thyristor, and the control end of the thyristor is connected to one of the control ports of the single chip microcomputer.

[0036] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present application without departing from the spirit and scope of the present application. In this way, if these modifications and changes are within the scope of the claims of the present application and their equivalents, the present application is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recorded in mutually different dependent claims does not indicate that the combination of these measures cannot be used to profit. Any figure mark in the claims should not be considered to limit the scope.

Claims

1. An NTC non-contact electric kettle, characterized in that: include: A heating plate and a kettle body that can be placed on the heating plate for heating; a sensor is provided on the inner side of the heating plate; A detection circuit is arranged inside the heating plate, the detection circuit comprising a temperature detection circuit and a liquid level detection circuit; the temperature detection circuit and the liquid level detection circuit are electrically connected to one of the wiring terminals of the sensor respectively; A control circuit board for controlling the heating power of the heating plate to prevent the kettle body from being damaged by dry burning during the heating process, wherein the control circuit board is arranged in the heating plate and is electrically connected to the temperature detection circuit and the liquid level detection circuit; When the kettle body is placed on the heating plate, the sensor transmits the detected actual heating temperature and liquid level of the kettle body to the control circuit board.

2. The NTC non-contact electric kettle according to claim 1, characterized in that: The sensor does not contact with the liquid in the kettle body, and when the kettle body is placed on the heating plate for heating, the sensor contacts with the outer side wall of the lower end of the kettle body.

3. The NTC non-contact electric kettle according to claim 2, characterized in that: The liquid level detection circuit is provided with an MCU / logic processing unit; the liquid level detection circuit is connected to the MCU / logic processing unit, providing data or signal corresponding to the change in capacitance of the sensor, and the MCU / logic processing unit transmits the processed information to the control circuit board.

4. The NTC non-contact electric kettle according to claim 1, characterized in that: The sensor includes: a conductive metal sheet, a spring, a conductive adhesive tape, a conductive cotton or a thermistor.

5. The NTC non-contact electric kettle according to claim 4, characterized in that: The kettle body is made of insulating dielectric materials, including glass and plastic glass.

6. The NTC non-contact electric kettle according to claim 1, characterized in that: The control circuit board includes a power supply circuit connected to an external alternating current AC, a power regulator, and a main control circuit for adjusting the heating power of the heating plate through the power regulator according to the actual heating temperature inside the kettle body. The heating plate is connected in series with the power regulator and then connected to the output end of the power supply circuit.

7. The NTC non-contact electric kettle according to claim 6, characterized in that: The main control circuit includes a single chip microcomputer; the power regulator is a thyristor, and the control end of the thyristor is connected to one of the control ports of the single chip microcomputer.

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