CN102613889B - Automatic power-off device for electric kettle - Google Patents
Automatic power-off device for electric kettle Download PDFInfo
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- CN102613889B CN102613889B CN201210098217.1A CN201210098217A CN102613889B CN 102613889 B CN102613889 B CN 102613889B CN 201210098217 A CN201210098217 A CN 201210098217A CN 102613889 B CN102613889 B CN 102613889B
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Abstract
The invention provides an automatic power-off device for an electric kettle. The automatic power-off device for the electric kettle comprises an automatic power-off control circuit (3) and a display panel connected to the automatic power-off control circuit (3), wherein the display panel is provided with an indicator light and a buzzer (9). The automatic power-off device for the electric kettle has the following technological effects: when water in the electric kettle is boiled, a signal of a humidity sensor probe (5) is connected to the external automatic power-off control circuit (3), the external automatic power-off control circuit (3) cuts off the electricity of the electric kettle from municipal electricity, the buzzer (9) produces sound and the indicating light is turned on, so that a user is reminded that the water is boiled; if nobody comes, the automatic power-off device can emit sound and light all the time for reminding, and automatically turns off the power circuit, and the electric kettle does not boil water continuously as long as no power failure occurs; and when a second kettle of water needs to be boiled, the automatic power-off control circuit (3) can reset automatically only by turning off the power supply of the municipal electricity and recovers the normal state.
Description
Technical field
The present invention relates to a kind of auto-power-off device, specifically, relate to a kind of auto-power-off device for insulating pot.
Background technology
Electric kettle is divided into non-automatic plain edition insulating pot and Automatic-temperature insulating pot, non-automatic plain edition insulating pot is after water boils, water vapour sends the tweeting sound prompting of sounding by pot lid, but can automatic cut-off power, need to manually pull up attaching plug; And after Automatic-temperature insulating pot switches on power about 5 minutes, water temperature progressively rises to 100 degree left and right, water comes to life, water vapour impacts the bimetal leaf above steam cock, due to the effect of expanding with heat and contract with cold, bimetal leaf dilatancy, backs down switch contact deenergization.
Existing various insulating pot is analyzed from the market:
1, non-automatic plain edition insulating pot, when heating up water, after water boils, needs manually insulating pot to be disconnected from civil power 220V power supply.
2, Automatic-temperature insulating pot is when heating up water, after water boils: a part is to utilize mechanical device that insulating pot power supply is disconnected from civil power 220V power supply; A part is to utilize temperature sensor to detect insulating pot power supply is disconnected from civil power 220V power supply in addition.
These conventional two kinds of insulating pots in use have the following disadvantages at present: 1, non-automatic plain edition insulating pot is when heating up water, people can not be away from, use inconvenient, so that when people forget while going out, not only cause a large amount of wastes of electric energy and burn out insulating pot, even may have potential safety hazard; 2, non-automatic common insulating pot is after water boils, and the device ratio that pipes of the water vapour on pot lid is easier to badly, changes 5 yuan of left and right of new general needs, and perhaps can have a unmatched situation of model after changing, therefore not too reliable; Although 3, Automatic-temperature insulating pot meeting auto power off after water boils, attemperating unit and insulating pot are all integrated, complicated structure, and price comparison is expensive.After attemperating unit breaks down, insulating pot need to return to producer's maintenance, so expense is higher, and cumbersome, and most families or unit occur, after this situation, insulating pot is scrapped to processing at insulating pot, relatively waste resource.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, a kind of easy to use, cheap, dependable performance is provided, and the auto-power-off device for insulating pot that can auto power off after water boils.
Auto-power-off device for insulating pot of the present invention, comprise automatic cut-off power control circuit (3) and be connected on the display floater on automatic cut-off power control circuit (3), described display floater is provided with indicator lamp and buzzer (9), and described automatic cut-off power control circuit (3) comprises step-down, rectification, filter circuit (10), sensor signal circuit for generating (11), amplifying circuit (13), auto-breaking and holding circuit (14), photoelectric isolating circuit (15) and output control circuit (16).
Described indicator lamp comprises that water does not boil green indicating lamp (7) and water has boiled red led (8).
Described step-down, rectification, filter circuit (10) comprise bridge rectifier, filter circuit (C7, C8, C9, C10) and the three terminal regulator (U5) that transformer (T1), four commutation diodes (D9, D10, D11, D12) form.Required dc source in automatic cut-off power control circuit (3) is all to obtain from step-down, rectification, filter circuit (10) output, and DC voltage value is all equally large.
Described sensor signal circuit for generating (11) comprises multi-harmonic self-excited oscillation circuit, electric capacity (C1), Wiring port J1(12) and humidity sensor probe (5).
Described amplifying circuit (13) comprises Wiring port J1(12), by LM324(U2) and D2, D3 the logarithmic transformation circuit, resistance (R3), the LM324(U2 that form) and the identical input comparator that forms of potentiometer (RP).
Described auto-breaking and holding circuit (14) comprise relay (K1), CD4013B(U3) and the monostable circuit that forms of resistance R 8, R9, capacitor C 5, C6 and bistable circuit, transistor Q1, relay (K1).By CD4013B(U3) the signal that senses from humidity sensor device probe (5) of input signal isolated be by utilizing the break-make of relay (K1) to realize.
Described photoelectric isolating circuit (15) comprises optocoupler (U4), resistance (R11), commutation diode (D8) and transistor (Q2).
Described output control circuit (16) comprises electrothermal tube (RL) and the power line (4) of output control relay (K2), insulating pot.
Auto-power-off device for insulating pot of the present invention, there is following technique effect: when electric kettle for water boils, the signal of humidity sensor probe (5) is connected to external automatic cut-off power control circuit (3), now external automatic cut-off power control circuit (5) can disconnect insulating pot from civil power, buzzer (9) sounding and indicator lamp are bright, and reminding user water has boiled; If nobody comes, the present invention can send acousto-optic always and remind, auto power off circuit simultaneously, only otherwise have a power failure, just insulating pot can not continue to heat up water; In the time will burning the second kettle water, only need to disconnect mains supply, automatic cut-off power control circuit (3) just can automatically reset, and recovers normal condition.Meanwhile, the power supply apparatus low price using in the present invention, cost is low, and whole apparatus for protecting power supply is reasonable in design, easy to use, stops the waste of electric energy, and safe and reliable, avoids the generation of accident, and whole insulating pot industry will be a great innovation.
Accompanying drawing explanation
Fig. 1 is the auto-power-off device for insulating pot of the present invention and insulating pot wiring schematic overview.
Fig. 2 is the schematic diagram of display floater of the present invention.
Fig. 3 is that automatic cut-off power control circuit of the present invention (3) principle is always schemed.
Fig. 3-1st, the circuit diagram of the step-down in automatic cut-off power control circuit of the present invention (3), rectification, filter circuit (10).
Fig. 3-2nd, the circuit diagram of the sensor signal circuit for generating (11) in automatic cut-off power control circuit of the present invention (3).
Fig. 3-3rd, the circuit diagram of the amplifying circuit (13) in automatic cut-off power control circuit of the present invention (3).
Fig. 3-4th, the circuit diagram of the auto-breaking in automatic cut-off power control circuit of the present invention (3) and holding circuit (14).
Fig. 3-5th, the photoelectric isolating circuit (15) in automatic cut-off power control circuit of the present invention (3) and output control circuit (16).
The specific embodiment
As Fig. 1, 2, 3, 3-1, 3-2, 3-3, shown in 3-4 and 3-5, auto-power-off device for insulating pot of the present invention, comprise automatic cut-off power control circuit (3) and be connected on the display floater on automatic cut-off power control circuit (3), described display floater is provided with indicator lamp and buzzer (9), described automatic cut-off power control circuit (3) comprises step-down, rectification, filter circuit (10), sensor signal circuit for generating (11), amplifying circuit (13), auto-breaking and holding circuit (14), photoelectric isolating circuit (15) and output control circuit (16).Indicator lamp comprises that water does not boil green indicating lamp (7) and water has boiled red led (8).Step-down, rectification, filter circuit (10) comprise bridge rectifier, filter circuit (C7, C8, C9, C10) and the three terminal regulator (U5) that transformer (T1), four commutation diodes (D9, D10, D11, D12) form.Required dc source in automatic cut-off power control circuit (3) is all to obtain from step-down, rectification, filter circuit (10) output, and DC voltage value is all equally large.Sensor signal circuit for generating (11) comprises multi-harmonic self-excited oscillation circuit, electric capacity (C1), Wiring port J1(12) and humidity sensor probe (5).Amplifying circuit (13) comprises Wiring port J1(12), by LM324(U2) and D2, D3 the logarithmic transformation circuit, resistance (R3), the LM324(U2 that form) and the identical input comparator that forms of potentiometer (RP).Auto-breaking and holding circuit (14) comprise relay (K1), CD4013B(U3) and the monostable circuit that forms of resistance R 8, R9, capacitor C 5, C6 and bistable circuit, transistor Q1, relay (K1).By CD4013B(U3) the signal that senses from humidity sensor device probe (5) of input signal isolated be by utilizing the break-make of relay (K1) to realize.Photoelectric isolating circuit (15) comprises optocoupler (U4), resistance (R11), commutation diode (D8) and transistor (Q2).Output control circuit (16) comprises electrothermal tube (RL) and the power line (4) of output control relay (K2), insulating pot.
In use of the present invention, pot lid top at insulating pot insulating pot (0), humidity sensor probe (5) is installed, the signal lead-out wire (6) of humidity sensor probe (5) is connected to external automatic cut-off power control circuit (3) input adapter, alternating current is connected to automatic cut-off power control circuit (3) through socket (2), and recycling power line (4) is connected to insulating pot (0).
Specific implementation process is as follows:
1, through transformer (T1), step-down obtains 9V alternating current to civil power 220V alternating current, the bridge rectifier, the filter circuit (C7, C8, C9, C10) that four commutation diodes (D9, D10, D11, D12), consist of carry out rectification and filtering again, by 7809 three terminal regulators (U5), carry out voltage stabilizing again and obtain 9V direct current, this direct current provides whole automatic cut-off power control circuit (3) used.
2, sensor signal circuit for generating (11) is by 555(U1) etc. the symmetrical square wave that produces of the multi-harmonic self-excited oscillation circuit that forms through electric capacity (C1), this level signal (17) is through Wiring port J1(12) add on humidity sensor probe (5); Humidity sensor probe (5) by the signal sensing through Wiring port J1(12) back pass delivers on follow-up amplifying circuit (18).
3, when electric kettle for water boils, sensor signal circuit for generating (11) is connected on the amplifying circuit (13) of external automatic cut-off power control circuit (3) through lead-out wire (6) by the humidity sensor level signal that (5) sense of popping one's head in, level signal is sent to the normally-closed contact of relay (K1), then deliver to auto-breaking and holding circuit (14).When this level signal sends auto-breaking and holding circuit (14) to, first by signal, give LM324(U2) and the logarithmic transformation circuit that forms of D2, D3, through resistance (R3), flow to LM324(U2 again) and the identical input comparator that forms of potentiometer (RP) after outputs level signals (due to after water boils, humidity sensor 5 resistance of popping one's head in change), so outputs level signals (19) becomes high level signal by low level signal after identical input comparator.
4, high level signal (19 is 20) is delivered to one end of the normally-closed contact of relay (K1) again.Other one end of relay (K1) normally-closed contact is transferred to auto-breaking and holding circuit (14) by high level signal (19), this high level signal (19) through the signal of relay (K1) output to CD4013B(U3) signal end (D), pass through CD4013B(U3) monostable circuit carries out pulse bandwidth shaping to the signal of relay (K1) output, then passes through CD4013B(U3) output (Q is the pin 23 of U3) the output high level signal (21) of bistable circuit.
5, at relay (K1), obtain after high level signal (20), relay (K1) normally-closed contact disconnects, normally opened contact is closed, by CD4013B(U3) high level signal (21) of bistable circuit output disconnects from amplifying circuit (13), making follow-up signal (21) no longer be subject to the impact of signal (19) above, thereby make CD4013B(U3) high level signal (21) of bistable circuit output remains unchanged.
6, CD4013B(U3) high level signal of bistable circuit output (21 is 22) continues to send to photoelectric isolating circuit (15) again.In photoelectric isolating circuit (15), the photoelectric isolating circuit (15) that this high level signal (22) forms through optocoupler (U4), resistance (R11) carrys out the transistor Q2 in driver output circuit (16), because now the level through R11 output becomes high level, so can driving transistors Q2 conducting.Then output control relay (K2) becomes disconnection by normally closed, and then the electrothermal tube (RL) that makes insulating pot dead electricity and disconnecting from civil power 220V power supply, and insulating pot dead electricity is no longer worked, and insulating pot is no longer heated up water.Because relay (K1) is by CD4013B(U3) high level signal (21) of bistable circuit output disconnects from amplifying circuit (13), CD4013B(U3) high level signal (21) of bistable circuit output is no longer subject to the impact of outputs level signals (19) after input comparator, thereby makes CD4013B(U3) high level signal (21) of bistable circuit output remains unchanged.
7, output control relay (K2) is initially located in normally off, and the electrothermal tube of insulating pot (RL) is connected mutually with output control relay (K2), and then can from civil power 220V power supply, directly obtain electric energy and connect.
8,, when electric kettle for water does not boil, sensor signal circuit for generating (11) is connected on the amplifying circuit (13) of external automatic cut-off power control circuit (3) through lead-out wire (6) by the humidity sensor level signal (17) that (5) sense of popping one's head in.When this level signal (17) sends auto-breaking and holding circuit (14) to, first by signal, give LM324(U2) and the logarithmic transformation circuit that forms of D2, D3, then through resistance (R3), flow to LM324(U2) and the identical input comparator of potentiometer (RP) composition after output low level signal (19).Then this low level signal (20) is delivered to one end of the normally-closed contact of relay (K1) again.Other one end of relay (K1) normally-closed contact is transferred to auto-breaking and holding circuit (14) by low level signal, this low level signal again through the signal of relay (K1) output to CD4013B(U3) signal end (D), pass through CD4013B(U3) monostable circuit carries out pulse bandwidth shaping and CD4013B(U3 to the signal of relay (K1) output) bistable circuit output low level signal (21).This low level signal (21) continues to send to photoelectric isolating circuit (15) again.In photoelectric isolating circuit (15), the photoelectric isolating circuit (15) that low level signal (21) forms through optocoupler (U4), resistance (R11) carrys out the transistor Q2 in driver output circuit (16), because be low level, so not conducting of Q2.Then output control relay (K2) is the normally off in starting to connect, and then the electrothermal tube (RL) of insulating pot can be obtained electric energy and connect from civil power 220V power supply, and insulating pot obtains electric work and can boil water.
From whole process, can realize the function of the invention, when water boils, by the electrothermal tube of insulating pot (RL) dead electricity and disconnecting from civil power 220V power supply.Because relay (K1) is by CD4013B(U3) high level signal (21) of bistable circuit output disconnects from amplifying circuit (13), so CD4013B(U3) bistable circuit can not obtain high level signal again and upset occurs to trigger, thereby makes to have realized insulating pot automatic cut-off power control circuit function.
Claims (1)
1. the auto-power-off device for insulating pot, it is characterized in that, comprise automatic cut-off power control circuit (3) and be connected on the display floater on automatic cut-off power control circuit (3), described display floater is provided with indicator lamp and buzzer (9), and described automatic cut-off power control circuit (3) comprises step-down, rectification, filter circuit (10), sensor signal circuit for generating (11), amplifying circuit (13), auto-breaking and holding circuit (14), photoelectric isolating circuit (15) and output control circuit (16);
Described indicator lamp comprises that water does not boil green indicating lamp (7) and water has boiled red led (8);
Described step-down, rectification, filter circuit (10) comprise bridge rectifier, filter circuit (C7, C8, C9, C10) and the three terminal regulator (U5) that transformer (T1), four commutation diodes (D9, D10, D11, D12) form;
Described sensor signal circuit for generating (11) comprises multi-harmonic self-excited oscillation circuit, electric capacity (C1), Wiring port J1(12) and humidity sensor probe (5);
Described amplifying circuit (13) comprises Wiring port J1(12), by LM324(U2) and D2, D3 the logarithmic transformation circuit, resistance (R3), the LM324(U2 that form) and the identical input comparator that forms of potentiometer (RP);
Described auto-breaking and holding circuit (14) comprise relay (K1), CD4013B(U3) and the monostable circuit that forms of resistance R 8, R9, capacitor C 5, C6 and bistable circuit, transistor Q1, relay (K1);
Described photoelectric isolating circuit (15) comprises optocoupler (U4), resistance (R11), commutation diode (D8) and transistor (Q2);
Described output control circuit (16) comprises electrothermal tube (RL) and the power line (4) of output control relay (K2), insulating pot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210098217.1A CN102613889B (en) | 2012-04-06 | 2012-04-06 | Automatic power-off device for electric kettle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210098217.1A CN102613889B (en) | 2012-04-06 | 2012-04-06 | Automatic power-off device for electric kettle |
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| Publication Number | Publication Date |
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| CN102613889A CN102613889A (en) | 2012-08-01 |
| CN102613889B true CN102613889B (en) | 2014-04-02 |
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| CN201210098217.1A Expired - Fee Related CN102613889B (en) | 2012-04-06 | 2012-04-06 | Automatic power-off device for electric kettle |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017120850A1 (en) * | 2016-01-14 | 2017-07-20 | 刘建兵 | Method and device for pushing information during automatic water boiling |
| WO2017120849A1 (en) * | 2016-01-14 | 2017-07-20 | 刘建兵 | Method and device for transmitting data during automatic water boiling |
| CN107348851A (en) * | 2017-08-07 | 2017-11-17 | 广东美的厨房电器制造有限公司 | Pot cover component and heating cooler |
Citations (7)
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|---|---|---|---|---|
| CN2124644U (en) * | 1992-05-08 | 1992-12-16 | 何新安 | Temperature-controlling electric kettle |
| JP3180675B2 (en) * | 1996-07-30 | 2001-06-25 | 松下電器産業株式会社 | Electric water heater |
| CN2638118Y (en) * | 2003-07-03 | 2004-09-01 | 中山市阿帕其电器有限公司 | Control circuit for electrothermal water bottle |
| CN101243943A (en) * | 2008-03-19 | 2008-08-20 | 孟卓 | Electric kettle, water boiling method and using method |
| CN201205211Y (en) * | 2008-02-22 | 2009-03-11 | 王智光 | Electric kettle capable of automatically controlling heating and displaying water temperature |
| CN201958613U (en) * | 2010-12-30 | 2011-09-07 | 孙泓 | Electric water heating kettle structure |
| CN202761024U (en) * | 2012-04-06 | 2013-03-06 | 吉小辉 | Automatic power-off device for electric kettle |
-
2012
- 2012-04-06 CN CN201210098217.1A patent/CN102613889B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2124644U (en) * | 1992-05-08 | 1992-12-16 | 何新安 | Temperature-controlling electric kettle |
| JP3180675B2 (en) * | 1996-07-30 | 2001-06-25 | 松下電器産業株式会社 | Electric water heater |
| CN2638118Y (en) * | 2003-07-03 | 2004-09-01 | 中山市阿帕其电器有限公司 | Control circuit for electrothermal water bottle |
| CN201205211Y (en) * | 2008-02-22 | 2009-03-11 | 王智光 | Electric kettle capable of automatically controlling heating and displaying water temperature |
| CN101243943A (en) * | 2008-03-19 | 2008-08-20 | 孟卓 | Electric kettle, water boiling method and using method |
| CN201958613U (en) * | 2010-12-30 | 2011-09-07 | 孙泓 | Electric water heating kettle structure |
| CN202761024U (en) * | 2012-04-06 | 2013-03-06 | 吉小辉 | Automatic power-off device for electric kettle |
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