Electric kettle detection circuit and electric kettle

Abstract

The present application relates to an electric kettle lifting detection circuit and an electric kettle, including a main controller, a switch tube and a photoelectric sensing component. The first end of the switch tube is connected to an external power supply port, the control end of the switch tube is connected to a signal end, the second end of the switch tube is connected to one end of the photoelectric sensing component, and the other end of the photoelectric sensing component is connected to the main controller, and the main controller is used to connect a water pump. When the electric kettle is in a standby state, the level given by the signal end turns off the switch tube, and this method can reduce the standby power consumption. When the electric kettle is in a normal operating state, the level given by the signal end turns on the switch tube. When the photoelectric sensing component is not blocked by the ring sheet at the bottom of the kettle body, that is, when it is in the lifting state, the photoelectric sensing component is turned on and outputs the corresponding level to the main controller. The main controller determines that it is in the lifting state according to the level and controls the water pump to stop discharging water in time, which will not affect the coupler and has high reliability.

Description

Technical Field

[0001] The present application relates to the field of detection and control technology, and in particular to an electric kettle lifting detection circuit and an electric kettle. Background Art

[0002] Electric kettles are now a common household appliance in our lives. Many electric kettles on the market now use water pumps to pump water from the bottom of the kettle. If the electric kettle is lifted during the pumping process, the water pump should stop working immediately, 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 electric kettle lifting and quickly shut down the corresponding load.

[0003] The traditional method usually uses a temperature-sensing package device to detect the kettle lifting. Since there is a delay in the reaction of the NTC resistor in the temperature-sensing package circuit, there will be a delay in shutting down the water pump. The delay will cause water to overflow from the water pump, so there is a risk of coupler short circuit. It can be seen that the reliability of traditional electric kettle lifting detection is low. Summary of the invention

[0004] Based on this, it is necessary to provide a highly reliable electric kettle lifting detection circuit and an electric kettle in order to solve the technical problem of low reliability of traditional kettle lifting detection.

[0005] An electric kettle lifting detection circuit comprises a main controller, a switch tube and a photoelectric sensing component, wherein the first end of the switch tube is connected to an external power port, the control end of the switch tube is connected to a signal end, the second end of the switch tube is connected to one end of the photoelectric sensing component, and the other end of the photoelectric sensing component is connected to the main controller, and the main controller is used to connect to a water pump, wherein the photoelectric sensing component is arranged opposite to a ring sheet at the bottom of a kettle body, so that when the kettle body is placed on a kettle base, the ring sheet blocks the photoelectric sensing component, and when the photoelectric sensing component is not blocked by the ring sheet, the photoelectric sensing component is turned on and outputs a high level to the main controller, and the main controller controls the water pump to stop discharging water.

[0006] In one embodiment, the switch tube is a triode, and the photoelectric sensing component is a photoelectric switch.

[0007] In one embodiment, the photoelectric switch includes a light emitting diode and a phototransistor, the anode of the light emitting diode is connected to the collector of the transistor, the cathode of the light emitting diode is grounded, the emitter of the phototransistor is connected to the main controller, and the collector of the phototransistor is connected to the collector end of the transistor.

[0008] In one of the embodiments, a first current limiting resistor is further included, one end of the first current limiting resistor is connected to the emitter of the phototransistor, and the other end of the first current limiting resistor is connected to the main controller.

[0009] In one of the embodiments, a second current limiting resistor is further included, and the first current limiting resistor is connected to the main controller via the second current limiting resistor.

[0010] In one of the embodiments, a voltage-dividing resistor is further included, and the first current-limiting resistor is grounded through the voltage-dividing resistor.

[0011] In one of the embodiments, a filter capacitor is further included, and the first current limiting resistor is grounded through the filter capacitor.

[0012] In one of the embodiments, a third current limiting resistor is further included, one end of the third current limiting resistor is connected to the cathode of the light emitting diode, and the other end of the third current limiting resistor is grounded.

[0013] In one embodiment, a fourth current limiting resistor is further included, one end of the fourth current limiting resistor is connected to the signal end, and the other end of the fourth current limiting resistor is connected to the control end of the switch tube.

[0014] In one embodiment, an electric kettle includes a kettle body, a kettle base and the above-mentioned electric kettle lifting detection circuit, and the electric kettle lifting detection circuit is arranged on the kettle base.

[0015] The above-mentioned electric kettle lifting detection circuit and electric kettle, when the electric kettle is in standby state, the level given by the signal end turns off the switch tube, this method can reduce standby power consumption, when the electric kettle is in normal operating state, the level given by the signal end turns on the switch tube, when the photoelectric sensing component is not blocked by the ring piece at the bottom of the kettle body, that is, when it is in the lifting state, the photoelectric sensing component is turned on and outputs the corresponding level to the main controller. The main controller judges that it is in the lifting state according to the level and controls the water pump to stop discharging water in time, which will not affect the coupler and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an application scenario diagram of an electric kettle lifting detection circuit in one embodiment;

[0017] Figure 2 is a bottom view of a coupler in one embodiment;

[0018] Figure 3 is a top view of a coupler in one embodiment;

[0019] Figure 4 It is a structural block diagram of an electric kettle lifting detection circuit in one embodiment;

[0020] Figure 5 is a structural diagram of a photoelectric sensing component in one embodiment;

[0021] Figure 6 The figure is a circuit diagram of an electric kettle lifting detection circuit in one embodiment. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] The application scenarios of this application are as follows Figure 1 As shown, the electric kettle includes a kettle body and a kettle base. A controller mainboard is installed on the kettle base. An MCU main control chip (corresponding to the main controller) is installed on the controller mainboard. A corresponding kettle lifting detection circuit is installed on the mainboard. The MCU main control chip can monitor the signal output by the kettle lifting detection circuit in real time and then control the water pump to stop discharging water in time. The photoelectric sensing component in the kettle lifting detection circuit is installed on the coupler, which can reliably fix the photoelectric sensing component. The mainboard is connected to the detection board with the photoelectric sensing component installed through the inter-board connection. The installation of the photoelectric sensing component on the coupler needs to be coordinated with the ring piece on the thermostat at the bottom of the kettle body. When the kettle body of the electric kettle is placed on the coupler of the base, the ring piece on the thermostat can disconnect the photoelectric sensing component. At this time, a low level is detected, and the electric kettle is in a stable state. When the electric kettle is removed from the base, the thermostat ring piece at the bottom of the electric kettle will not disconnect the photoelectric sensing component. At this time, a high level is detected, and it is judged to be in the kettle lifting state. Furthermore, there are corresponding structural parts at the bottom of the thermostat to fix the detection board with the photoelectric sensing component installed. The bottom view of the coupler is as follows: Figure 2 After the detection board with the photoelectric sensing component is fixed, the two ends of the photoelectric sensing component are located on the two rings of the coupler. When the kettle body is placed on the coupler, the ring of the thermostat can block the photoelectric sensing component. The top view of the coupler is as shown in the figure below. Figure 3 As shown, further, the installation of the photoelectric sensing component can be designed according to the structure of the actual coupler.

[0024] In one embodiment, Figure 4 As shown, an electric kettle lifting detection circuit includes a main controller 130, a switch tube 110 and a photoelectric sensing component 120, wherein the first end of the switch tube 110 is connected to an external power port, the control end of the switch tube 110 is connected to a signal end, the second end of the switch tube 110 is connected to one end of the photoelectric sensing component 120, and the other end of the photoelectric sensing component 120 is connected to the main controller 130, and the main controller 130 is used to connect a water pump, wherein the photoelectric sensing component 120 is arranged opposite to the ring sheet at the bottom of the kettle body, so that when the kettle body is placed on the kettle base, the ring sheet blocks the photoelectric sensing component 120, and when the photoelectric sensing component 120 is not blocked by the ring sheet, the photoelectric sensing component 120 is turned on and outputs a corresponding electrical level to the main controller 130, and the main controller 130 controls the water pump to stop discharging water.

[0025] Specifically, in this embodiment, the main controller, the switch tube and the photoelectric sensing component are arranged on the base of the kettle. The base is provided with a groove corresponding to the ring piece at the bottom of the kettle body. The two ends of the photoelectric sensing component are arranged at the two ends of the groove. When the kettle body is placed on the kettle base, the ring piece is inserted into the groove of the base, so that the photoelectric sensing component is cut off. Furthermore, the structural diagram of the photoelectric sensing component is shown in FIG. Figure 5 shown.

[0026] When the electric kettle is in standby state, the level given by the signal end turns off the switch tube. This method can reduce standby power consumption. When the electric kettle is in normal state, the level given by the signal end turns on the switch tube, and the kettle lifting detection is performed through the photoelectric sensing component. The photoelectric sensing component is installed on the coupler. There is a kettle lifting detection circuit on the main controller motherboard. There is a thermostat at the bottom of the kettle body, and there is a ring on the thermostat. When the kettle body is placed on the kettle base, the ring on the thermostat blocks the photoelectric sensing component. At this time, the main controller detects a low level and judges that the kettle is not in the state of lifting. When the kettle body is removed from the base, the ring on the thermostat will not block the photoelectric sensing component. At this time, the main controller detects a high level and judges that the kettle is in the state of lifting. The kettle lifting judgment is performed in this way. Since the photoelectric sensing component reacts quickly, the kettle lifting detection is faster and more accurate.

[0027] In one embodiment, the switch tube is a triode, and the photoelectric sensing component is a photoelectric switch.

[0028] Specifically, Figure 6 As shown, the transistor Q311 acts as a switch, the control end of the transistor Q311 serves as the control end of the switch tube, the emitter of the transistor Q311 serves as the first end of the switch tube, and the collector of the transistor Q311 serves as the second end of the switch tube. When the voltage applied between the control end and the emitter is higher than a certain value, it is turned on, and lower than a certain value, it is turned off. When the electric kettle is on standby, this signal gives a high level, and the transistor Q311 is turned off. When the electric kettle is not in standby state, this signal gives a low level, and the transistor Q311 is turned on.

[0029] In one embodiment, the photoelectric switch includes a light emitting diode and a phototransistor, the anode of the light emitting diode is connected to the collector of the transistor, the cathode of the light emitting diode is grounded, the emitter of the phototransistor is connected to the main controller, and the collector of the phototransistor is connected to the collector end of the transistor.

[0030] Specifically, one end of the photoelectric switch SWITCH1 is the light-emitting end, that is, the light-emitting diode, and the other end is the light-receiving end, that is, the photosensitive transistor. When there is nothing blocking the light-emitting end and the light-receiving end, the photoelectric switch is turned on; when there is nothing blocking the light-emitting end and the light-receiving end, the photoelectric switch is turned off. If the photosensitive transistor can receive light normally, the photoelectric switch is turned on, and the IO port of the main controller detects a high level. If something blocks the photoelectric switch in the middle, the photoelectric switch is disconnected, and the IO port of the main controller detects a low level.

[0031] When the whole machine is in standby state, the signal terminal "LIGHTBUTTON" gives a high level, and the transistor Q311 is cut off. This method can reduce the standby power consumption. When the whole machine is in normal state, when the photoelectric switch is blocked, the photosensitive transistor of the photoelectric switch is cut off. At this time, CHECK1 detects a low level. When the photoelectric switch is not blocked, the photoelectric switch is turned on and CHECK1 detects a high level.

[0032] In one embodiment, the kettle lifting detection circuit further includes a first current limiting resistor, one end of which is connected to the emitter of the phototransistor, and the other end of which is connected to the main controller. In one embodiment, the kettle lifting detection circuit further includes a second current limiting resistor, and the first current limiting resistor is connected to the main controller via the second current limiting resistor.

[0033] Specifically, the first current limiting resistor R312 and the second current limiting resistor R311 play a role in limiting the current, so as to limit the magnitude of the current in the branch to prevent excessive current from burning out the components connected in series. At the same time, the current limiting resistors can also play a role in voltage division.

[0034] In one embodiment, the kettle detection circuit further includes a voltage-dividing resistor, and the first current-limiting resistor is grounded through the voltage-dividing resistor.

[0035] Specifically, one end of the voltage-dividing resistor R313 is connected to the common end of the first current-limiting resistor R312 and the second current-limiting resistor R311. The voltage-dividing resistor refers to the resistance of a conductor connected in series with a certain circuit. When the total voltage remains unchanged, a voltage-dividing resistor is connected in series with a certain circuit, which will play a role in voltage division. Part of the voltage will drop on the voltage-dividing resistor, thereby reducing the voltage across the two ends of this part of the circuit. At the same time, the resistance value of R313 can be adjusted according to its own needs, specifically according to the judgment range of the high level of the main controller.

[0036] In one embodiment, the kettle detection circuit further includes a filter capacitor, and the first current limiting resistor is grounded via the filter capacitor.

[0037] Specifically, the filter capacitor C313 is connected in parallel with R313 , one end of which is connected to the common end of the first current limiting resistor R312 and the second current limiting resistor R311 , and the other end of which is grounded.

[0038] In one embodiment, the kettle lifting detection circuit further includes a third current limiting resistor, one end of the third current limiting resistor is connected to the cathode of the light emitting diode, and the other end of the third current limiting resistor is grounded. In one embodiment, the kettle lifting detection circuit further includes a fourth current limiting resistor, one end of the fourth current limiting resistor is connected to the signal end, and the other end of the fourth current limiting resistor is connected to the control end of the switch tube.

[0039] Specifically, the third current limiting resistor R3 and the fourth current limiting resistor R314 play a role in limiting current, so as to limit the magnitude of the current in the branch to prevent excessive current from burning out the components connected in series. At the same time, the current limiting resistors can also play a role in voltage division.

[0040] In a detailed embodiment, the kettle detection circuit is as follows Figure 6 As shown, it includes a main controller, a transistor Q311, a photoelectric switch SWITCH1, a first current limiting resistor R312 to a fourth current limiting resistor R314, a voltage dividing resistor R313 and a filter capacitor C313, the photoelectric switch SWITCH1 includes a light emitting diode and a photosensitive transistor, the emitter of the transistor Q311 is connected to the external power port, the collector of the transistor Q311 is connected to the anode of the light emitting diode, the control end of the transistor Q311 is connected to one end of the fourth current limiting resistor R314, the other end of the fourth current limiting resistor R314 is connected to the signal end, and the photosensitive transistor The collector of the phototransistor is connected to the collector of the transistor Q311, the cathode of the light-emitting diode is connected to one end of the third current limiting resistor R3, the other end of the third current limiting resistor R3 is grounded, the emitter of the phototransistor is connected to one end of the first current limiting resistor R312, the first current limiting resistor R312 is connected in series with the second current limiting resistor R311, the other end of the second current limiting resistor R311 is connected to the main controller, the voltage divider resistor R313 and the filter capacitor C313 are connected in parallel, one end of the parallel connection is connected to the common end of the first current limiting resistor R312 and the second current limiting resistor R311, and the other end is grounded.

[0041] In the above-mentioned electric kettle lifting detection circuit, when the whole machine is in standby state, "LIGHTBUTTON" gives a high level and the transistor is cut off. This method can reduce standby power consumption. When the whole machine is in normal state, when the photoelectric switch is blocked, the photosensitive transistor of the photoelectric switch is cut off. Due to the existence of the voltage divider resistor, CHECK1 detects a low level at this time. When the photoelectric switch is not blocked, the photoelectric switch is turned on. Due to the resistor as a voltage divider resistor, the resistance value can be adjusted according to its own needs. CHECK1 detects a high level. Furthermore, the device can also be adjusted to interchange the high and low levels of the kettle lifting detection; it can effectively detect whether the electric kettle is placed well, so as to perform related operations, quickly detect that the electric kettle is lifted, reduce the overflow of water in the water pump, reduce the risk of short circuit on the coupler, and improve the safety of users using the electric kettle; simple operation and low cost.

[0042] In one embodiment, an electric kettle includes a kettle body, a kettle base and the above-mentioned electric kettle lifting detection circuit, and the electric kettle lifting detection circuit is arranged on the kettle base.

[0043] Specifically, for further limitations on the electric kettle, please refer to the above-mentioned limitations on the electric kettle lifting detection circuit, which will not be elaborated here.

[0044] In the above-mentioned electric kettle, when the electric kettle is in standby state, the level given by the signal end turns off the switch tube. This method can reduce standby power consumption. When the electric kettle is in normal operating state, the level given by the signal end turns on the switch tube. When the photoelectric sensing component is not blocked by the ring piece at the bottom of the kettle body, that is, when it is in the kettle lifting state, the photoelectric sensing component is turned on and outputs the corresponding level to the main controller. The main controller judges that it is in the kettle lifting state according to the level and controls the water pump to stop discharging water in time, which will not affect the coupler and has high reliability.

[0045] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An electric kettle detection circuit, characterized in that: It includes a main controller, a switch tube and a photoelectric sensing component, wherein the first end of the switch tube is connected to an external power port, the control end of the switch tube is connected to a signal end, the second end of the switch tube is connected to one end of the photoelectric sensing component, and the other end of the photoelectric sensing component is connected to the main controller, and the main controller is used to connect a water pump, wherein the photoelectric sensing component is arranged opposite to a ring sheet at the bottom of a kettle body, so that when the kettle body is placed on the kettle base, the ring sheet blocks the photoelectric sensing component, and when the photoelectric sensing component is not blocked by the ring sheet, the photoelectric sensing component is turned on and outputs a corresponding electrical level to the main controller, and the main controller controls the water pump to stop discharging water.

2. The circuit according to claim 1, characterized in that The switch tube is a triode, and the photoelectric sensing component is a photoelectric switch.

3. The circuit according to claim 2, characterized in that The photoelectric switch includes a light emitting diode and a phototransistor, wherein the anode of the light emitting diode is connected to the collector of the transistor, the cathode of the light emitting diode is grounded, the emitter of the phototransistor is connected to the main controller, and the collector of the phototransistor is connected to the collector end of the transistor.

4. The circuit according to claim 3, characterized in that It also includes a first current limiting resistor, one end of which is connected to the emitter of the phototransistor, and the other end of which is connected to the main controller.

5. The circuit according to claim 4, characterized in that It also includes a second current limiting resistor, and the first current limiting resistor is connected to the main controller through the second current limiting resistor.

6. The circuit according to claim 4, characterized in that A voltage-dividing resistor is also included, and the first current-limiting resistor is grounded through the voltage-dividing resistor.

7. The circuit according to claim 4, characterized in that It also includes a filter capacitor, and the first current limiting resistor is grounded through the filter capacitor.

8. The circuit according to claim 3, characterized in that It also includes a third current limiting resistor, one end of which is connected to the cathode of the light emitting diode, and the other end of which is grounded.

9. The circuit according to claim 1, characterized in that It also includes a fourth current limiting resistor, one end of which is connected to the signal end, and the other end of which is connected to the control end of the switch tube.

10. An electric kettle, characterized in that: The invention comprises a kettle body, a kettle base and an electric kettle lifting detection circuit as claimed in any one of claims 1 to 9, wherein the electric kettle lifting detection circuit is arranged on the kettle base.

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