CN210568606U - Control circuit and cooking utensils - Google Patents
Control circuit and cooking utensils Download PDFInfo
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- CN210568606U CN210568606U CN201921470879.0U CN201921470879U CN210568606U CN 210568606 U CN210568606 U CN 210568606U CN 201921470879 U CN201921470879 U CN 201921470879U CN 210568606 U CN210568606 U CN 210568606U
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Abstract
The application provides a control circuit and cooking utensils, wherein control circuit includes: a thermocouple including a first pin; the negative pressure generating module is used for generating negative pressure; the electromagnetic valve comprises a first coil and a second coil; one end of the first coil is grounded, and the other end of the first coil is connected with a first pin of the thermocouple; one end of the second coil is grounded, and the other end of the second coil is connected with the negative pressure generation module; the detection control module is respectively connected with the first pin, the other end of the second coil and the positive voltage power supply and used for communicating the other end of the second coil with the positive voltage power supply when the heating temperature of the thermocouple is not higher than the first temperature, and disconnecting the other end of the second coil with the positive voltage power supply when the heating temperature of the thermocouple is higher than the first temperature. The safety of cooking utensils has been improved to this application.
Description
Technical Field
The application relates to the field of cookers, in particular to a control circuit and a cooker.
Background
The gas cooker is a common household kitchen user, a gas switch of the cooker is usually an electromagnetic valve, the electromagnetic valve attracts a valve core after being electrified so as to control an air inlet valve of gas to be opened, and the electromagnetic valve resets under the action of a spring force after being electrified so as to seal the air inlet valve.
In the prior art, in order to enable the cooker to immediately close the electromagnetic valve after flameout, the electromagnetic valve is actively controlled by software, and when a software control method is adopted, if the software fails, a circuit is easy to fail, and the electromagnetic valve cannot be closed in time to cause danger.
Therefore, the safety of the kitchen range is improved, which is a problem to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The application provides a control circuit and a cooker, which are used for improving the safety of the cooker.
In order to solve the above-mentioned problems, as an aspect of the present application, there is provided a control circuit including:
a thermocouple including a first pin;
the negative pressure generating module is used for generating negative pressure;
the electromagnetic valve comprises a first coil and a second coil; one end of the first coil is grounded, and the other end of the first coil is connected with a first pin of the thermocouple; one end of the second coil is grounded, and the other end of the second coil is connected with the negative pressure generation module;
detect control module, respectively with the other end and the malleation power of first pin, second coil are connected, are used for when the thermocouple is heated the temperature and is not higher than first temperature, will the other end of second coil with malleation power intercommunication when the thermocouple is heated the temperature and is higher than first temperature, will the other end and the malleation power disconnection of second coil.
Optionally, the detection control module includes: a detection unit and a control unit;
the detection unit is respectively connected with the first pin and the control unit and is used for sending a control signal to the control unit according to the voltage on the first pin;
the control unit is respectively connected with the positive voltage power supply, the other end of the second coil and the detection unit and is used for controlling the on-off between the positive voltage power supply and the other end of the second coil according to the control signal.
Optionally, the detection unit includes an amplifier, an output end of the amplifier is connected to the control unit, an input end of the amplifier is connected to the first pin, and a control signal is output to the control unit through the output end of the amplifier;
and/or the control unit comprises a first switch, wherein the first switch is provided with a first end, a second end and a control end; the first end is connected with the other end of the second coil, and the second end is connected with the positive voltage power supply; the control end is connected with the detection unit and used for receiving the control signal so as to control the connection and disconnection between the first end and the second end.
Optionally, the first switch is a triode or a mos tube;
and/or a first resistor is arranged on a connecting line of the detection unit and the control unit.
Optionally, a non-inverting input terminal of the amplifier is grounded, and an inverting input terminal of the amplifier is connected to the first pin;
the output end of the amplifier is connected with the control unit.
Optionally, the control unit includes a first switch, and the first switch is a PNP type triode.
The inverting input end of the amplifier is grounded, and the non-inverting input end of the amplifier is connected with the first pin;
the output end of the amplifier is connected with the control unit.
Optionally, the control unit includes a first switch, and the first switch is an NPN-type triode.
Optionally, the input end of the amplifier, which is grounded, is grounded through a second resistor;
and/or the input end of the amplifier connected with the first pin is connected with the first pin through a third resistor;
and/or the inverting input end of the amplifier is connected with the output end through a fourth resistor.
The application also provides a cooker which comprises any one of the control circuits provided by the application.
The application provides a control circuit and cooking utensils, and the control circuit and the stove that this application provided make the electric current in the second coil reverse when flame-out to close the admission valve of gas, do not rely on software control among the control circuit that this application provided, rely on the characteristic of hardware, can guarantee solenoid valve self-closing when software became invalid, thereby improved the security.
Drawings
Fig. 1 is a block diagram of a control circuit according to an embodiment of the present disclosure;
fig. 2 is a block diagram of another control circuit according to an embodiment of the present disclosure.
Description of the drawings: 1. an electromagnetic valve; 11. a first coil; 12. a second coil; 21. a first resistor; 22. a second resistor; 23. a third resistor; 24. a fourth resistor; 21. a controller; 3. a thermocouple; 31. a first pin; 4. a negative pressure generating module; 5. a detection control module; 51. a detection unit; 511. an amplifier; 52. a control unit; 521. a first switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, the gas inlet valve is controlled to be opened and closed through the electromagnetic valve on the cooker, specifically, the gas inlet valve is controlled through software logic of the control chip, however, the dependence on software is high by adopting the mode, and when the software fails, the gas inlet valve cannot be closed easily after the cooker is flamed out, so that gas leakage is caused.
With reference to fig. 1 and 2, the present application proposes a control circuit, preferably for a hob, comprising:
a thermocouple 3 including a first pin 31;
specifically, the thermocouple 3 is provided with a first pin and a second pin, the thermocouple is used for detecting flame on the stove, when fire is normally generated on the stove, a voltage difference is generated between the first pin and the second pin of the thermocouple 3, electromotive force on the first pin is lower than that of the second pin, the second pin can be grounded, and negative pressure is generated on the first pin if the thermocouple is heated.
The negative pressure generating module 4 is used for generating negative pressure;
a solenoid valve 1 including a first coil 11 and a second coil 12; one end of the first coil 11 is grounded, and the other end of the first coil 11 is connected with a first pin 31 of the thermocouple 3; one end of the second coil 12 is grounded, and the other end of the second coil 12 is connected with the negative voltage generation module 4; specifically, when the thermocouple is heated, a voltage difference is generated between the first pin 31 and the ground wire, so that the first coil 11 is powered to work, in the application, when the first coil 11 and the second coil 12 are powered to work, the electromagnetic valve opens the gas inlet valve, and when the first coil and the second coil are not powered or power supply is abnormal, the electromagnetic valve closes the gas inlet valve.
Detect control module 5, respectively with the other end and the malleation power of first pin 31, second coil 12 are connected, are used for thermocouple 3 is heated when the temperature is not higher than first temperature, will the other end of second coil 12 with malleation power intercommunication thermocouple 3 is heated when the temperature is higher than first temperature, will the other end and the malleation power disconnection of second coil 12.
Specifically, when the stove is normally fired, the fire source heats the thermocouple, when the thermocouple 3 is heated, a voltage difference is generated at two ends of the first coil 11, the first coil 11 is powered to work, the detection control module 5 enables the other end of the second coil 12 to be disconnected with the positive voltage power supply, therefore, the potential at the other end of the second coil 12 is equal to the electromotive force output by the negative voltage generation module, namely, the electromotive force at the other end of the second coil is lower than the grounded end of the second coil 12, a voltage difference is generated at two ends of the second coil 12, the second coil is powered to work, therefore, the electromagnetic valve keeps the gas inlet valve open, when the stove is flamed out, the heating temperature of the thermocouple 3 is gradually reduced, when the temperature is reduced to be lower than the first temperature, the voltage on the first pin 31 of the thermocouple 3 is not enough for the first coil 11 to normally work, when the heating temperature of the thermocouple 3 is reduced, therefore, the first coil 11 does not work, meanwhile, the detection control module 5 controls the other end of the second coil 12 to be communicated with the positive voltage power supply, so that the potential of the other end of the second coil is higher than that of the grounded end of the second coil, the electrifying direction of the second coil is opposite to that of the second coil in normal working, the opposite current direction generates opposite electromagnetic force, therefore, the first coil and the second coil of the electromagnetic valve do not work, and the electromagnetic valve closes the gas inlet valve.
In some optional embodiments, please refer to fig. 2, the detection control module 5 includes: a detection unit 51 and a control unit 52; the detection unit 51 is respectively connected to the first pin 31 and the control unit 52, and is configured to send a control signal to the control unit 52 according to the voltage on the first pin 31;
the control unit 52 is connected to the positive voltage power supply, the other end of the second coil, and the detection unit 51, and is configured to control on/off between the positive voltage power supply and the other end of the second coil 12 according to the control signal.
In some optional embodiments, the detecting unit 51 includes an amplifier 511, an output of the amplifier 511 is connected to the control unit 52, an input of the amplifier 511 is connected to the first pin 31, and a control signal is output to the control unit 52 through the output of the amplifier;
the first pin may be connected to either the non-inverting input or the inverting input of the amplifier 511, as the case may be.
In some alternative embodiments, the control unit 52 includes a first switch 521, the first switch 521 having a first end, a second end, and a control end; the first end is connected with the other end of the second coil 12, and the second end is connected with the positive voltage power supply; the control end is connected with the detection unit 51 and is used for receiving the control signal so as to control the connection and disconnection between the first end and the second end. Optionally, the first switch 521 is a triode or a mos tube.
Optionally, a first resistor 21 is disposed on a connection line between the detection unit and the control unit, and the first resistor 21 is used for limiting a current to prevent the control unit from being burnt by an excessive current of the control signal output by the detection unit 51.
In some alternative embodiments, the non-inverting input of the amplifier 511 is grounded, and the inverting input is connected to the first pin 31; the output of the amplifier 511 is connected to the control unit 52.
Specifically, referring to fig. 2, when the stove is on fire, the thermocouple 3 is heated to generate a negative pressure at the first pin 31, because the non-inverting input terminal of the amplifier (e.g., operational amplifier) is grounded, the potential of the inverting input terminal is equal to that of the non-inverting input terminal, the potential of the output terminal is higher than that of the inverting input terminal, and the output terminal will output a high level, in order to keep the first switch 521 in an off state, optionally, the control unit 52 includes the first switch 521, and the first switch is a PNP type triode. PNP type triode keeps collecting electrode (first end) and projecting pole (second end) disconnection when base (control end) input is the high level, consequently, the other end of second coil 12 is not connected with the malleation power, second coil 12 can normally be electrified work, and when the cooking utensils were flamed out, the thermocouple is no longer heated, consequently, amplifier output low level, PNP type's triode switches on this moment, collecting electrode and projecting pole intercommunication, make the other end of malleation power and second coil be connected, thereby make the current direction of second coil 12 opposite with the normal during operation, thereby it closes the admission valve to be the solenoid valve.
In some alternative embodiments, the inverting input of the amplifier 511 is grounded, and the non-inverting input is connected to the first pin 31; the output of the amplifier 511 is connected to the control unit 52. Optionally, the control unit 52 includes a first switch 521, and the first switch 521 is an NPN transistor. In this embodiment, contrary to the case of using the PNP transistor, when the thermocouple 3 is heated, the amplifier 511 outputs a low level, the base of the NPN transistor keeps the collector (first end) and the emitter (second end) disconnected at the low level, the second coil 12 operates normally, when the thermocouple is not heated, the amplifier 511 outputs a high level, the collector and the emitter of the NPN transistor are turned on, the current on the second coil 12 is reversed, and thus the second coil cannot operate normally, and the solenoid valve closes the gas inlet valve of the gas.
In some alternative embodiments, the input terminal of the amplifier that is connected to ground through a second resistor 22;
in some alternative embodiments, the input terminal of the amplifier 511 connected to the first pin is connected to the first pin 31 through a third resistor 23;
in some alternative embodiments, the inverting input of the amplifier is connected to the output through a fourth resistor 24. The amplifier may be an operational amplifier.
The present application also proposes a hob comprising a control circuit as any of the control circuits proposed in the present application.
To better explain the control circuit proposed in the present application, please refer to fig. 2, a solenoid valve 1 is used to control the opening and closing of the gas inlet valve of the fuel gas, when the first coil 11 and the second coil 12 both work normally, the gas inlet valve of the fuel gas is opened, a thermocouple 3 is used to detect the flame on the stove, when the stove is on fire normally, a negative pressure is generated on the first pin 31, so that a voltage difference is generated between the two ends of the first coil 11, the first coil 11 works normally, meanwhile, the same-direction input end of the amplifier 511 is grounded, the reverse-direction input end is connected with the first pin 31, at this time, the output end of the amplifier 511 outputs a high level, the first switch 521 is a PNP triode, when the base of the PNP triode inputs a high level, the collector and the emitter are disconnected, so that the other end of the second coil is not connected with the positive voltage source, but, the second coil 12 normally works, the admission valve of gas is opened, and when the cooking utensils were flamed out, no longer produce the negative pressure on thermocouple 3's the first pin, 11 both ends of first coil no longer have sufficient voltage difference this moment, first coil 11 is out of work, amplifier 511 will export the low level simultaneously, the PNP triode is opened, collecting electrode and projecting pole intercommunication, the other end and the positive voltage power supply intercommunication of second coil 12, because the voltage of positive voltage power supply is higher than the ground wire, so the current direction on the second coil 12 is opposite rather than when normally working, produce opposite electromagnetic force, because first coil 11 and second coil 12 do not normally work, so solenoid valve 1 closes the admission valve of gas.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. A control circuit, comprising:
a thermocouple (3) comprising a first pin (31);
a negative pressure generating module (4) for generating negative pressure;
a solenoid valve (1) comprising a first coil (11) and a second coil (12); one end of the first coil (11) is grounded, and the other end of the first coil (11) is connected with a first pin (31) of the thermocouple (3); one end of the second coil (12) is grounded, and the other end of the second coil (12) is connected with the negative pressure generating module (4);
detect control module (5), respectively with the other end and the malleation power of first pin (31), second coil (12) are connected, are used for when thermocouple (3) is heated the temperature and is not higher than first temperature, will the other end of second coil (12) with malleation power intercommunication thermocouple (3) is heated the temperature and is higher than first temperature, will the other end and the malleation power disconnection of second coil (12).
2. The control circuit of claim 1,
a detection control module (5) comprising: a detection unit (51) and a control unit (52);
the detection unit (51) is respectively connected with the first pin (31) and the control unit (52) and is used for sending a control signal to the control unit (52) according to the voltage on the first pin (31);
and the control unit (52) is respectively connected with the positive voltage power supply, the other end of the second coil and the detection unit (51) and is used for controlling the on-off between the positive voltage power supply and the other end of the second coil (12) according to the control signal.
3. The control circuit of claim 2,
the detection unit (51) comprises an amplifier (511), the output end of the amplifier (511) is connected with the control unit (52), one input end of the amplifier (511) is connected with the first pin (31), and a control signal is output to the control unit (52) through the output end of the amplifier;
and/or the presence of a gas in the gas,
the control unit (52) comprises a first switch (521), the first switch (521) having a first end, a second end and a control end; the first end is connected with the other end of the second coil (12), and the second end is connected with the positive voltage power supply; the control end is connected with the detection unit (51) and used for receiving the control signal so as to control the connection and disconnection between the first end and the second end.
4. The control circuit of claim 3,
the first switch (521) is a triode or a mos tube;
and/or a first resistor (21) is arranged on a connecting line of the detection unit (51) and the control unit (52).
5. The control circuit of claim 3 or 4,
the non-inverting input end of the amplifier (511) is grounded, and the inverting input end of the amplifier is connected with the first pin (31);
the output of the amplifier (511) is connected to the control unit (52).
6. The control circuit of claim 5,
the control unit (52) comprises a first switch (521), and the first switch is a PNP type triode.
7. The control circuit of claim 3 or 4,
the inverting input end of the amplifier (511) is grounded, and the non-inverting input end of the amplifier is connected with the first pin (31);
the output of the amplifier (511) is connected to the control unit (52).
8. The control circuit of claim 7,
the control unit (52) comprises a first switch (521), and the first switch (521) is an NPN type triode.
9. The control circuit according to any one of claims 3-4, 6, 8,
the input end of the amplifier which is grounded through a second resistor (22);
and/or the input end of the amplifier (511) connected with the first pin is connected with the first pin (31) through a third resistor (23);
and/or the inverting input end of the amplifier is connected with the output end through a fourth resistor (24).
10. The control circuit of claim 5,
the input end of the amplifier which is grounded through a second resistor (22);
and/or the input end of the amplifier (511) connected with the first pin is connected with the first pin (31) through a third resistor (23);
and/or the inverting input end of the amplifier is connected with the output end through a fourth resistor (24).
11. The control circuit of claim 7,
the input end of the amplifier which is grounded through a second resistor (22);
and/or the input end of the amplifier (511) connected with the first pin is connected with the first pin (31) through a third resistor (23);
and/or the inverting input end of the amplifier is connected with the output end through a fourth resistor (24).
12. Hob, characterized in, that it comprises a control circuit according to any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921470879.0U CN210568606U (en) | 2019-09-05 | 2019-09-05 | Control circuit and cooking utensils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921470879.0U CN210568606U (en) | 2019-09-05 | 2019-09-05 | Control circuit and cooking utensils |
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| Publication Number | Publication Date |
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| CN210568606U true CN210568606U (en) | 2020-05-19 |
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| CN201921470879.0U Active CN210568606U (en) | 2019-09-05 | 2019-09-05 | Control circuit and cooking utensils |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469875A (en) * | 2019-09-05 | 2019-11-19 | 珠海格力电器股份有限公司 | Control circuit and kitchen range |
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2019
- 2019-09-05 CN CN201921470879.0U patent/CN210568606U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469875A (en) * | 2019-09-05 | 2019-11-19 | 珠海格力电器股份有限公司 | Control circuit and kitchen range |
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