CN212751775U - Intelligent electric kettle control circuit with water level detection function - Google Patents
Intelligent electric kettle control circuit with water level detection function Download PDFInfo
- Publication number
- CN212751775U CN212751775U CN202021318172.0U CN202021318172U CN212751775U CN 212751775 U CN212751775 U CN 212751775U CN 202021318172 U CN202021318172 U CN 202021318172U CN 212751775 U CN212751775 U CN 212751775U
- Authority
- CN
- China
- Prior art keywords
- water level
- circuit
- resistor
- level detection
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Cookers (AREA)
Abstract
The utility model discloses an intelligent insulating pot control circuit of area water level detection, including steam bimetal temperature switch S1, normally open contact K1 and electric plate R1 at 220V alternating current power supply both ends of series connection in proper order, the circuit both ends parallel connection after normally open contact K1 and electric plate R1 establish ties has water level monitoring and control circuit, water level monitoring and control circuit include 5V power supply circuit, water level detection circuit and control and display circuit, 5V power supply circuit is used for converting alternating voltage into stable 5V direct current voltage, water level detection circuit includes force sensing resistor R4 and comparator LM339, comparator LM339 accepts force sensing resistor R4' S pressure drop signal and outputs a level signal extremely solid state relay K1 in control and the display circuit, solid state relay K1 control normally open contact K1 is closed or the disconnection. The utility model discloses can guarantee not having water or the water level does not have under the condition of electric heat dish even press the switch of heating up water by mistake, the insulating pot can not carry out the action of heating up water yet.
Description
Technical Field
The utility model relates to a water level detects automatic power-off device who prevents dry combustion method, specifically speaking relates to a take water level detection's intelligent insulating pot control circuit.
Background
At present, electric heating kettles on the market are mainly divided into a common electric kettle and a temperature control electric kettle, but the common electric kettle and the common temperature control electric kettle do not have water level detection. That is, when water is not filled, the water boiling switch is pressed to still perform the water boiling operation. If the water boiling switch is pressed down by misoperation or children curiously, the electric appliance is burnt out if the water boiling switch is light, and the electric appliance is in fire danger if the water boiling switch is heavy.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a take water level detection's intelligent insulating pot control circuit to solve the switch that boils water under the condition of not adorning water that exists among the prior art, still carry out the action of boiling water, thereby cause the kettle to burn out the technical problem who takes place the conflagration even easily.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model provides an intelligent insulating pot control circuit of area water level detection, includes steam bimetal temperature switch S1, normally open contact K1 and electric heat dish R1 that series connection in proper order connects at 220V alternating current power supply both ends, and the circuit both ends parallel connection after normally open contact K1 and electric heat dish R1 establish ties has water level monitoring and control circuit, water level monitoring and control circuit includes 5V power supply circuit, water level detection circuit and control and display circuit, 5V power supply circuit is used for converting alternating voltage into stable 5V direct current voltage, water level detection circuit includes force sensing resistor R4 and comparator LM339, comparator LM339 receives the pressure drop signal of force sensing resistor R4 and outputs a level signal to solid state relay K1 in the control and display circuit, solid state relay K1 control normally open contact K1 closes or breaks off.
Further, the 5V power supply circuit includes a transformer T1, a bridge rectifier circuit D1, a protection diode D2 and a 5V three-terminal regulator U1, two terminals of a primary side of the transformer T1 are connected in parallel to two ends of a circuit in which a normally open contact K1 and an electric heating disk R1 are connected in series, two terminals of a secondary side of the transformer T1 are connected to two input ends of the bridge rectifier circuit D1, a positive output end and a negative output end of the bridge rectifier circuit D1 are connected to a positive line and a negative line respectively, an electrolytic capacitor C1, a ceramic chip capacitor C2, an electrolytic capacitor C3 and a ceramic chip capacitor C4 are connected between the positive line and the negative line, an input end and an output end of the 5V three-terminal regulator U1 are connected in series in the positive line, the protection diode D2 is connected in parallel to two ends of the 5V three-terminal regulator U1, and a ground end of the 5V three-terminal.
Further, the water level detection circuit further comprises a resistor R2, a resistor R3 and a zener diode D3, the resistor R2 and the zener diode D3 are connected in series and then are connected to the positive line and the negative line, a connection point of the resistor R2 and the zener diode D3 is connected with the positive end of the comparator LM339, the resistor R3 and the force-sensitive resistor R4 are connected in series and then are connected to the positive line and the negative line, a connection point of the resistor R3 and the force-sensitive resistor R4 is connected with the negative end of the comparator LM339, and a level output end of the comparator LM339 is connected to the control and display circuit.
Further, the zener diode D3 provides a 3.9V reference voltage.
Further, the resistances of the force-sensitive resistor R4 and the resistor R3 are selected to satisfy the following conditions: when the water amount in the kettle reaches the set amount, the voltage drop on the force sensitive resistor R4 is 3.9V.
Further, the set quantity is a quantity value when the water in the kettle just passes through the electric heating plate.
Further, the control and display circuit further comprises a red light emitting diode D4, a pull-up resistor R5, a green light emitting diode D5 and a switch triode Q1, one end of the pull-up resistor R5 is connected to the positive electrode line, the other end of the pull-up resistor R5 is connected to the positive electrode of the red light emitting diode D4, the negative electrode of the red light emitting diode D4 is connected to the base electrode of the switch triode Q1, the connection point of the negative electrode of the switch triode D1 is connected to the level output end of the comparator LM339, the emitter of the switch triode Q1 is connected to the negative electrode line, the collector of the switch triode Q1 is connected to the negative electrode of the green light emitting diode D5, one end of the solid-state relay K1 is connected to the positive.
Further, the red light emitting diode D4 is a water shortage indicator, and the green light emitting diode D5 is a normal water boiling indicator.
Compared with the prior art, the utility model discloses an intelligent insulating pot control circuit who takes water level detection can guarantee not having water or water level to press down the boiling water switch by mistake under the condition of electric heat dish, and insulating pot can not carry out the action of heating up water yet, has improved safety in utilization, has avoided the insulating pot because dry combustion method and the phenomenon that is burnt out.
Drawings
Fig. 1 is a schematic circuit diagram of an intelligent electric kettle control circuit with water level detection according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an intelligent electric kettle control circuit with water level detection according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 to 2, an intelligent electric kettle control circuit with water level detection comprises a steam bimetal temperature switch S1, a normally open contact K1 and an electric heating plate R1 which are sequentially connected in series at two ends of a 220V alternating current power supply, wherein the two ends of a circuit formed by connecting the normally open contact K1 and the electric heating plate R1 in series are connected in parallel with a water level monitoring and control circuit, the water level monitoring and control circuit comprises a 5V power circuit, a water level detection circuit and a control and display circuit, the 5V power circuit is used for converting alternating current voltage into stable 5V direct current voltage, the water level detection circuit comprises a force sensitive resistor R4 and a comparator LM339, the comparator LM339 receives a voltage drop signal of the force sensitive resistor R4 and outputs a level signal to a solid state relay K1 in the control and display circuit, and the solid state relay K1 controls the normally open contact K1 to be closed or opened.
The 5V power supply circuit comprises a transformer T1, a bridge rectifier circuit D1, a protection diode D2 and a 5V three-terminal voltage-stabilizing U1, two terminals of the primary side of the transformer T1 are connected in parallel at two ends of a circuit formed by connecting a normally open contact K1 and an electric heating disc R1 in series, two terminals of the secondary side of the transformer T1 are connected with two input ends 1 and 3 of the bridge rectifier circuit D1, the positive output end 2 and the negative output end 4 of the bridge rectifier circuit D1 are respectively connected with a positive pole line and a negative pole line, an electrolytic capacitor C1, a ceramic chip capacitor C2, an electrolytic capacitor C3 and a ceramic chip capacitor C4 are connected between the positive electrode line and the negative electrode line, the input end 1 and the output end 3 of the 5V three-terminal voltage-stabilizing U1 are connected in series in the positive electrode line, the protection diode D2 is connected in parallel at two ends of the 5V three-terminal voltage-stabilizing U1, and the grounding end 2 of the 5V three-terminal voltage-stabilizing U1 is connected to the negative electrode line.
The water level detection circuit further comprises a resistor R2, a resistor R3 and a voltage stabilizing diode D3, the resistor R2 is connected with the voltage stabilizing diode D3 in series and then is connected to the positive line and the negative line, a connection point of the resistor R2 and a voltage stabilizing diode D3 is connected with the positive end of the comparator LM339, the resistor R3 is connected with the force sensitive resistor R4 in series and then is connected to the positive line and the negative line, a connection point of the resistor R3 and the force sensitive resistor R4 is connected with the negative end of the comparator LM339, and the level output end of the comparator LM339 is connected to the control and display circuit.
Wherein, the zener diode D3 provides a reference voltage of 3.9V, which is input to the positive terminal of the comparator LM 339. The resistance values of the force-sensitive resistor R4 and the resistor R3 are selected to meet the following conditions: the voltage drop of the force-sensitive resistor R4 is 3.9V when the kettle is filled with water to a certain amount (generally, the water is not over the electric heating plate).
The control and display circuit further comprises a red light emitting diode D4, a pull-up resistor R5, a green light emitting diode D5 and a switch triode Q1, one end of the pull-up resistor R5 is connected with the positive electrode line, the other end of the pull-up resistor R5 is connected with the positive electrode of the red light emitting diode D4, the negative electrode of the red light emitting diode D4 is connected with the base electrode of the switch triode Q1, the connection point of the negative electrode of the red light emitting diode D1 is connected with the level output end of the comparator LM339, the emitter electrode of the switch triode Q1 is connected with the negative electrode line, the collector electrode of the switch triode Q1 is connected with the negative electrode of the green light emitting diode D5, one end of the solid-state relay K.
Wherein, red LED D4 is a water shortage indicator, and green LED D5 is a normal water boiling indicator.
The utility model discloses take water level detection's intelligent insulating pot control circuit's theory of operation as follows:
(1) under normal conditions, the steam bimetal temperature switch S1 is normally open state, and solid state relay K1 is normally open state, even connect 220V power supply circuit and do not work.
(2) When the water is not in the water tank or the water level does not pass through the electric heating plate, and the switch S1 is pressed by mistake, the water level detection and control circuit is powered on. Because the kettle has no water or the water level is too low, the pressure of the whole kettle body is small, the resistance value of the force-sensitive resistor R4 is very large, the voltage drop is far larger than 3.9V, the output of the comparator LM339 is saturated (namely the output end is grounded), the switch triode Q1 is cut off, the solid-state relay K1 does not act, the normally open contact K1 is in a normally open state, the electric heating disc R1 does not work, and meanwhile, the red light-emitting diode D4 is lightened, so that the kettle is warned that the kettle has no water or the.
(3) And (5) a water boiling process. When the steam bimetal temperature switch S1 is pressed, the water level detection and control circuit is electrified. Because the kettle is full of water and has high pressure, the resistance of the force-sensitive resistor R4 is reduced, and the voltage drop is far lower than 3.9V, so that the comparator LM339 is cut off, high level is output, and the red light-emitting diode D4 is not bright. Meanwhile, the comparator LM339 is cut off and outputs high level, so that the switching triode Q1 is in saturated conduction, the solid-state relay K1 is electrified, the normally open contact K1 is closed, the green light-emitting diode D5 is lightened, and water is boiled.
(4) And (5) finishing boiling water. When the water boils to reach 100 ℃, the steam bimetal temperature switch S1 is switched off, meanwhile, the water level detection and control circuit is powered off, the normally open contact K1 is switched off, and the whole circuit is powered off.
The present invention has been disclosed in the foregoing with reference to the preferred embodiments, but it is not intended to limit the present invention, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation schemes fall within the protection scope of the present invention.
Claims (8)
1. The utility model provides an intelligent insulating pot control circuit with water level detection, its characterized in that, including steam bimetal temperature switch S1, normally open contact K1 and electric heat dish R1 of series connection in proper order at 220V alternating current power supply both ends, the circuit both ends parallel connection after normally open contact K1 and electric heat dish R1 establish ties has water level monitoring and control circuit, water level monitoring and control circuit includes 5V power supply circuit, water level detection circuit and control and display circuit, 5V power supply circuit is used for converting alternating voltage into stable 5V direct current voltage, water level detection circuit includes force sensing resistor R4 and comparator LM339, comparator LM339 accepts the voltage drop signal of force sensing resistor R4 and outputs a level signal to solid state relay K1 in the control and display circuit, solid state relay K1 control normally open contact K1 closes or breaks off.
2. The intelligent electric kettle control circuit with water level detection function as claimed in claim 1, wherein said 5V power circuit comprises a transformer T1, a bridge rectifier circuit D1, a protection diode D2 and a 5V three-terminal voltage stabilization U1, two terminals of the primary side of said transformer T1 are connected in parallel with two ends of the circuit after the normally open contact K1 and the electric heating plate R1 are connected in series, two terminals of the secondary side of said transformer T1 are connected with two input ends of said bridge rectifier circuit D1, the positive output end and the negative output end of said bridge rectifier circuit D1 are respectively connected with the positive line and the negative line, an electrolytic capacitor C1, a ceramic capacitor C2, an electrolytic capacitor C3 and a ceramic capacitor C4 are connected between said positive line, the input end and the output end of said 5V three-terminal voltage stabilization U1 are connected in series, said protection diode D2 is connected in parallel with two ends of said 5V three-terminal voltage stabilization U1, and the grounding end of the 5V three-terminal voltage-stabilizing U1 is connected to the negative line.
3. An intelligent electric kettle control circuit with water level detection as claimed in claim 2, wherein said water level detection circuit further comprises a resistor R2, a resistor R3 and a zener diode D3, said resistor R2 is connected in series with said zener diode D3 and then connected to said positive line and said negative line, said resistor R2 is connected to said zener diode D3 and connected to said positive terminal of said comparator LM339, said resistor R3 is connected in series with said force sensitive resistor R4 and then connected to said positive line and said negative line, said resistor R3 is connected to said force sensitive resistor R4 and connected to said negative terminal of said comparator LM339, and said level output terminal of said comparator LM339 is connected to said control and display circuit.
4. An intelligent electric kettle control circuit with water level detection as claimed in claim 3, wherein the zener diode D3 provides a 3.9V reference voltage.
5. An intelligent electric kettle control circuit with water level detection as claimed in claim 3, wherein the resistances of the force sensitive resistor R4 and the resistor R3 are selected to satisfy the following condition: when the water amount in the kettle reaches the set amount, the voltage drop on the force sensitive resistor R4 is 3.9V.
6. An intelligent electric kettle control circuit with water level detection as claimed in claim 5, wherein the set amount is the amount of water in the kettle just over the electric heating plate.
7. An intelligent electric kettle control circuit with water level detection as claimed in claim 3, wherein said control and display circuit further comprises a red LED D4, a pull-up resistor R5, a green LED D5 and a switch transistor Q1, wherein one end of said pull-up resistor R5 is connected to said positive electrode line, the other end is connected to the positive electrode of the red LED D4, the negative electrode of the red LED D4 is connected to the base electrode of the switch transistor Q1, and the connection point is connected to the level output terminal of the comparator LM339, the emitter of the switch transistor Q1 is connected to said negative electrode line, the collector of the switch transistor Q1 is connected to the negative electrode of the green LED D5, one end of the solid state relay K1 is connected to said positive electrode line, and the other end is connected to the positive electrode of the green LED D5.
8. The intelligent electric kettle control circuit with water level detection as claimed in claim 7, wherein the red LED D4 is a water shortage indicator light, and the green LED D5 is a normal water boiling indicator light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021318172.0U CN212751775U (en) | 2020-07-07 | 2020-07-07 | Intelligent electric kettle control circuit with water level detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021318172.0U CN212751775U (en) | 2020-07-07 | 2020-07-07 | Intelligent electric kettle control circuit with water level detection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212751775U true CN212751775U (en) | 2021-03-19 |
Family
ID=75022029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021318172.0U Active CN212751775U (en) | 2020-07-07 | 2020-07-07 | Intelligent electric kettle control circuit with water level detection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212751775U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114520494A (en) * | 2022-03-07 | 2022-05-20 | 李连海 | Safety limiting device for electric equipment |
-
2020
- 2020-07-07 CN CN202021318172.0U patent/CN212751775U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114520494A (en) * | 2022-03-07 | 2022-05-20 | 李连海 | Safety limiting device for electric equipment |
| CN114520494B (en) * | 2022-03-07 | 2023-10-20 | 太原山开吉羽电力工程有限公司 | Safety limiting device for electric equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212751775U (en) | Intelligent electric kettle control circuit with water level detection function | |
| CN103389663A (en) | Timing switch of touch electric kettle | |
| CN202094430U (en) | Intelligent and anti-electric shock safety socket | |
| CN203423331U (en) | Multifunctional intelligent safety power supply socket without standby loss | |
| CN212256121U (en) | Temperature control protection device for PTC and NTC heating wire | |
| CN210469748U (en) | Temperature control and protection device for PTC/NTC heating wire | |
| CN204626593U (en) | A kind of water outlet anti-scalding protection device of the electronic toilet | |
| CN208871119U (en) | A kind of electromagnetic valve energy-saving circuit | |
| CN203564097U (en) | Novel water dispenser | |
| CN214412257U (en) | Electric leakage protection device and electric appliance | |
| CN209526293U (en) | Three pole on-off leakage protecting plug of semi-intelligent | |
| CN201477454U (en) | Microcomputer electric kettle control panel | |
| CN211505802U (en) | Temperature detect switch detection circuit | |
| CN201163720Y (en) | Multi-use household electrical appliance protector capable of automatic trip when power-on after power-off | |
| CN209694880U (en) | A kind of safety heat-preserving device of electric kettle | |
| CN209415790U (en) | A kind of anti-dry detection circuit and heater | |
| CN218630594U (en) | Temperature control circuit of intelligent control device | |
| CN214856027U (en) | Heater with temperature control protection | |
| CN210143668U (en) | Portable electric mosquito killer | |
| CN215067905U (en) | Towel rack control circuit | |
| CN218446491U (en) | Control circuit of electric hot-water bag | |
| CN210136435U (en) | Control circuit of thermosensitive temperature control type electric kettle | |
| CN220962252U (en) | Temperature detection control circuit suitable for kettle | |
| CN209787530U (en) | novel protection module of intelligent household light control system | |
| CN214153996U (en) | Leakage protector with overtemperature protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |