CN210136435U - Control circuit of thermosensitive temperature control type electric kettle - Google Patents
Control circuit of thermosensitive temperature control type electric kettle Download PDFInfo
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- CN210136435U CN210136435U CN201920617066.3U CN201920617066U CN210136435U CN 210136435 U CN210136435 U CN 210136435U CN 201920617066 U CN201920617066 U CN 201920617066U CN 210136435 U CN210136435 U CN 210136435U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000009835 boiling Methods 0.000 claims description 6
- 239000003985 ceramic capacitor Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 238000009841 combustion method Methods 0.000 abstract 1
- 230000008054 signal transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The utility model discloses a temperature sensing control by temperature change type insulating pot control circuit, include the dry combustion method switch S1, resistance wire R1 and normally open contact K1 of preventing that is connected with 220V alternating current both ends, resistance wire R1 ' S both ends parallel have temperature sensing control by temperature change circuit, normally open contact K1 ' S both ends parallel have switch S2 that boils water, temperature sensing control by temperature change circuit includes 5V power supply circuit, voltage comparison circuit and relay execution circuit, 5V power supply circuit is used for converting alternating voltage into stable 5V direct current voltage, voltage comparison circuit includes thermistor PTC and comparator LM339, comparator LM339 accepts thermistor PTC voltage signal, gives with level signal transmission relay execution circuit ' S solid state relay K1, solid state relay K1 control normally open contact K1 is closed and the disconnection. The utility model provides a pair of temperature-sensitive temperature-control electric kettle control circuit, convenient to use, low in cost, dependable performance, and can automatic disconnection power after water boils.
Description
Technical Field
The utility model relates to a temperature-sensitive temperature-control electric kettle control circuit, which belongs to the technical field of electric kettle circuits.
Background
At present, electric heating kettles on the market are mainly divided into a common electric kettle and a temperature control electric kettle, after water is boiled in the common electric kettle, steam sends out a sound alarm through a kettle cover, the power supply cannot be actively cut off, and a power plug needs to be manually pulled out; when the water in the automatic temperature control electric kettle begins to boil, the water vapor impacts the bimetallic strip on the steam switch, and the bimetallic strip expands and deforms under the action of expansion with heat and contraction with cold, so that the switch contact is pushed open to disconnect the power supply.
The two common electric kettles mainly have the following disadvantages in the using process: when the common electric kettle is used for boiling water, people cannot leave the kettle, and safety accidents such as fire disasters and the like are easily caused once the power supply is forgotten to be pulled out; the working principle of the automatic temperature control electric kettle is as follows: the bimetallic strip of the steam temperature sensing element is deformed by utilizing the steam generated when the water is boiled, and the deformation is utilized to push the power switch by the lever principle, so that the electric kettle is automatically powered off after the water is boiled. The mechanical temperature control device can not close the power switch due to the aging of the bimetallic strip and the like, so that water is easily dried, and an electric kettle is burnt out or a fire is caused in a serious condition.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome the defects of the prior art, and provide a temperature-sensitive temperature-controlled electric kettle control circuit which is convenient to use, low in cost, reliable in performance and capable of automatically disconnecting the power supply after water is boiled.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a temperature-sensing and temperature-controlling electric kettle control circuit comprises an anti-dry heating switch S1, a resistance wire R1 and a normally open contact K1 which are connected with two ends of 220V alternating current, wherein two ends of the resistance wire R1 are connected with a temperature-sensing and temperature-controlling circuit in parallel, two ends of the normally open contact K1 are connected with a water boiling switch S2 in parallel, the temperature-sensing and temperature-controlling circuit comprises a 5V power circuit, a voltage comparison circuit and a relay execution circuit, the 5V power circuit is used for converting alternating current voltage into stable 5V direct current voltage, the voltage comparison circuit comprises a thermistor PTC and a comparator LM339, the comparator LM339 receives a voltage signal of the thermistor PTC and transmits a level signal to a solid relay K1 of the relay execution circuit, and the solid relay K1 controls the normally open contact K1 to be closed and opened.
The 5V power supply circuit comprises a transformer T1 and a 5V three-terminal voltage-stabilizing U1, two ends of the transformer T1 are connected to an interface 1 and an interface 3 of a bridge rectifier circuit D1, an interface 2 and an interface 4 of the bridge rectifier circuit D1 are respectively connected with a positive line and a negative line, an electrolytic capacitor C1, a ceramic capacitor C2, an electrolytic capacitor C3 and a ceramic capacitor C4 are connected between the positive line and the negative line, a pin 1 and a pin 3 of the 5V three-terminal voltage-stabilizing U1 are connected in series in the positive line, a protection diode D1 is connected in parallel to two ends of the 5V three-terminal voltage-stabilizing U1, and a pin 2 of the 5V three-terminal voltage-stabilizing U1 is connected to the negative line.
The voltage comparison circuit comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a ceramic chip capacitor C5, the resistor R2 and the resistor R3 are connected in series and then connected into a positive line and a negative line, the connection part is connected with the negative end of the comparator LM339, the thermistor PTC and the resistor R4 are connected in series and then connected into the positive line and the negative line, the connection part is connected with the positive end of the comparator LM339, one end of the ceramic chip capacitor C5 is connected with the positive line, the other end of the ceramic chip capacitor C5 is connected with the connection part of the thermistor PTC and the resistor R4, one end of the resistor R5 is connected with the positive line, and the other end of the resistor R5 is connected with the.
The resistance value of the resistor R2 is equal to that of the resistor R3, and the resistance value of the thermistor PTC at 100 degrees is smaller than that of the resistor R4.
The relay execution circuit comprises a freewheeling diode D3, the freewheeling diode D3 is connected with the solid-state relay K1 in parallel, one end of the freewheeling diode D3 is connected with the positive electrode line, and the other end of the freewheeling diode D3 is connected with the level output end of the comparator LM 339.
The water boiling switch S2 is a push switch.
The utility model has the advantages that: the utility model provides a temperature-sensitive temperature-controlled electric kettle control circuit, which can eliminate the potential safety hazard brought by the closing of a power switch by utilizing the lever principle of metal deformation. In addition, the utility model discloses a temperature sensing control by temperature change type insulating pot control circuit, convenient to use, low in cost, dependable performance, and can automatic disconnection power after water boils.
Drawings
FIG. 1 is a schematic circuit diagram of a control circuit of a temperature-sensitive temperature-controlled electric kettle according to the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and the following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and 2, the control circuit of the thermal temperature control electric kettle comprises an anti-dry heating switch S1, a resistance wire R1 and a normally open contact K1 which are connected with two ends of a 220V alternating current, wherein two ends of the resistance wire R1 are connected in parallel with a thermal temperature control circuit, two ends of the normally open contact K1 are connected in parallel with a water heating switch S2, and the water heating switch S2 is a press type switch. The temperature-sensitive temperature control circuit comprises a 5V power circuit, a voltage comparison circuit and a relay execution circuit, wherein the 5V power circuit is used for converting alternating-current voltage into stable 5V direct-current voltage, the voltage comparison circuit comprises a thermistor PTC and a comparator LM339, the comparator LM339 receives a voltage signal of the thermistor PTC, a level signal is transmitted to a solid-state relay K1 of the relay execution circuit, and the solid-state relay K1 controls the normally-open contact K1 to be closed and disconnected.
The 5V power supply circuit comprises a transformer T1 and a 5V three-terminal voltage-stabilizing U1, two ends of the transformer T1 are connected to an interface 1 and an interface 3 of a bridge rectifier circuit D1, an interface 2 and an interface 4 of the bridge rectifier circuit D1 are respectively connected with a positive line and a negative line, an electrolytic capacitor C1, a ceramic capacitor C2, an electrolytic capacitor C3 and a ceramic capacitor C4 are connected between the positive line and the negative line, a pin 1 and a pin 3 of the 5V three-terminal voltage-stabilizing U1 are connected in series in the positive line, a protection diode D1 is connected in parallel to two ends of the 5V three-terminal voltage-stabilizing U1, and a pin 2 of the 5V three-terminal voltage-stabilizing U1.
The voltage comparison circuit comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a ceramic chip capacitor C5, wherein the resistor R2 and the resistor R3 are connected in series and then connected into a positive electrode line and a negative electrode line, the connection part of the resistor R2 and the resistor R3 is connected in series and then connected into the negative electrode line and the positive electrode line, the connection part of the resistor PTC and the resistor R4 is connected in series and then connected into the positive electrode line and the negative electrode line, the connection part of the resistor PTC and the resistor LM339 is connected, one end of the ceramic chip capacitor C5 is connected with the positive electrode line, the other end of the ceramic chip capacitor C5 is connected with the connection.
The resistance value of the resistor R2 is equal to that of the resistor R3, 2.5V reference voltage is provided for the negative terminal of the comparator LM339, the thermistor PTC is of a negative temperature type, the resistance value is large when the temperature is low, and the resistance value at 100 ℃ is smaller than that of the resistor R4.
The relay execution circuit comprises a freewheeling diode D3, a freewheeling diode D3 and a solid-state relay K1 which are connected in parallel, one end of the freewheeling diode D3 is connected with a positive line, and the other end of the freewheeling diode D3 is connected with the level output end of the comparator LM 339.
The utility model discloses a theory of operation does:
(1) normally, the dry-heating preventing switch S1 is closed, and only when the kettle is empty of water and the kettle is dry-heated, the dry-heating preventing switch S1 is turned off to cut off the power supply.
(2) In the water boiling process, when the water boiling switch S2 is pressed, the resistance value of the negative temperature type thermistor PTC is very large due to low water temperature, the voltage drop of the R4 resistor is nearly 0 and is 2.5V smaller than the negative end of the comparator LM339, the comparator LM339 outputs low level, the solid-state relay K1 is electrified, and the normally open contact K1 is closed to form self-locking; along with the gradual rise of water temperature, when the water boils and reaches 100 ℃, the PTC resistance value of the thermistor is reduced until the PTC resistance value is smaller than the R4 resistance value, the voltage drop on the R4 resistor is larger than 2.5V, the LM339 outputs high level, the solid state relay K1 is powered down, the normally open contact K1 is disconnected, and the whole circuit is powered down.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (6)
1. A temperature sensing and temperature control type electric kettle control circuit is characterized in that: the anti-dry heating device comprises an anti-dry heating switch S1, a resistance wire R1 and a normally open contact K1 which are connected with two ends of 220V alternating current, wherein two ends of the resistance wire R1 are connected with a heat-sensitive temperature control circuit in parallel, two ends of the normally open contact K1 are connected with a water heating switch S2 in parallel, the heat-sensitive temperature control circuit comprises a 5V power circuit, a voltage comparison circuit and a relay execution circuit, the 5V power circuit is used for converting alternating current voltage into stable 5V direct current voltage, the voltage comparison circuit comprises a thermistor PTC and a comparator LM339, the comparator LM339 receives a voltage signal of the thermistor PTC and transmits a level signal to a solid-state relay K1 of the relay execution circuit, and the solid-state relay K1 controls the normally open contact K1 to be closed and disconnected.
2. The temperature-sensitive temperature-controlled electric kettle control circuit as claimed in claim 1, wherein: the 5V power supply circuit comprises a transformer T1 and a 5V three-terminal voltage-stabilizing U1, wherein two ends of the transformer T1 are connected with an interface 1 and an interface 3 of a bridge rectifier circuit D1, an interface 2 and an interface 4 of the bridge rectifier circuit D1 are respectively connected with a positive line and a negative line, an electrolytic capacitor C1, a ceramic capacitor C2, an electrolytic capacitor C3 and a ceramic capacitor C4 are connected between the positive line and the negative line, a pin 1 and a pin 3 of the 5V three-terminal voltage-stabilizing U1 are connected in series in the positive line, a protection diode D1 is connected in parallel with two ends of the 5V three-terminal voltage-stabilizing U1, and a pin 2 of the 5V three-terminal voltage-stabilizing U1 is connected into the negative line.
3. The temperature-sensitive temperature-controlled electric kettle control circuit as claimed in claim 2, wherein: the voltage comparison circuit comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a ceramic chip capacitor C5, the resistor R2 and the resistor R3 are connected in series and then connected into a positive line and a negative line, the connection part is connected with the negative end of the comparator LM339, the thermistor PTC and the resistor R4 are connected in series and then connected into the positive line and the negative line, the connection part is connected with the positive end of the comparator LM339, one end of the ceramic chip capacitor C5 is connected with the positive line, the other end of the ceramic chip capacitor C5 is connected with the connection part of the thermistor PTC and the resistor R4, one end of the resistor R5 is connected with the positive line, and the other end of the resistor R5 is connected with the.
4. A temperature-sensitive temperature-controlled electric kettle control circuit as claimed in claim 3, wherein: the resistance value of the resistor R2 is equal to that of the resistor R3, and the resistance value of the thermistor PTC at 100 degrees is smaller than that of the resistor R4.
5. The temperature-sensitive temperature-controlled electric kettle control circuit as claimed in claim 2, wherein: the relay execution circuit comprises a freewheeling diode D3, the freewheeling diode D3 is connected with the solid-state relay K1 in parallel, one end of the freewheeling diode D3 is connected with the positive electrode line, and the other end of the freewheeling diode D3 is connected with the level output end of the comparator LM 339.
6. The temperature-sensitive temperature-controlled electric kettle control circuit as claimed in claim 1, wherein: the water boiling switch S2 is a push switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920617066.3U CN210136435U (en) | 2019-04-30 | 2019-04-30 | Control circuit of thermosensitive temperature control type electric kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920617066.3U CN210136435U (en) | 2019-04-30 | 2019-04-30 | Control circuit of thermosensitive temperature control type electric kettle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210136435U true CN210136435U (en) | 2020-03-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920617066.3U Active CN210136435U (en) | 2019-04-30 | 2019-04-30 | Control circuit of thermosensitive temperature control type electric kettle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210136435U (en) |
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2019
- 2019-04-30 CN CN201920617066.3U patent/CN210136435U/en active Active
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