CN210662950U - Control circuit and cooking utensils - Google Patents
Control circuit and cooking utensils Download PDFInfo
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- CN210662950U CN210662950U CN201921470883.7U CN201921470883U CN210662950U CN 210662950 U CN210662950 U CN 210662950U CN 201921470883 U CN201921470883 U CN 201921470883U CN 210662950 U CN210662950 U CN 210662950U
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Abstract
The application provides a control circuit and cooking utensils, wherein control circuit includes: the electromagnetic valve comprises a first coil and a second coil, wherein the first end of the first coil and the first end of the second coil are grounded; the first pin of the thermocouple is connected with the second end of the first coil; a negative pressure generating module; one end of the first resistor is connected with the negative pressure generating module, and the other end of the first resistor is connected with the second end of the second coil; one end of the normally closed switch is connected with one end of the first resistor, the other end of the normally closed switch is connected with the other end of the first resistor, and the normally closed switch is provided with a controller; the detection control module is respectively connected with the first pin and the controller and is used for controlling the controller to disconnect the normally closed switch when the heating temperature of the thermocouple is not higher than the first temperature; when the heating temperature of the thermocouple is higher than the first temperature, the normally closed switch is automatically closed. According to the application, the electromagnetic valve can be ensured to be automatically closed when software fails, so that the safety is improved.
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, it is an urgent problem to be solved in the art to provide a control circuit that does not depend on software, and to automatically close the electromagnetic valve after the fire of the cooking stove is turned off, so as to improve the safety of the cooking stove.
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:
the electromagnetic valve comprises a first coil and a second coil, wherein the first end of the first coil and the first end of the second coil are grounded;
the first pin of the thermocouple is connected with the second end of the first coil;
the negative pressure generating module is used for providing negative pressure;
one end of the first resistor is connected with the negative voltage generation module, and the other end of the first resistor is connected with the second end of the second coil;
one end of the normally closed switch is connected with one end of the first resistor, the other end of the normally closed switch is connected with the other end of the first resistor, and the normally closed switch is provided with a controller;
the detection control module is respectively connected with the first pin and the controller and is used for controlling the controller to disconnect the normally closed switch when the heating temperature of the thermocouple is not higher than a first temperature; and when the heating temperature of the thermocouple is higher than the first temperature, the normally closed switch is automatically closed.
Optionally, the normally closed switch is a normally closed relay;
and/or the presence of a gas in the gas,
the detection control module includes: a detection unit and a control unit;
the detection unit is connected with the first pin and outputs a control signal to the control unit when the heating temperature of the thermocouple is not higher than a first temperature;
the control unit is connected with a controller of the normally closed switch and used for controlling the controller when receiving the control signal so that the controller disconnects the normally closed switch.
Optionally, the detection unit includes an amplifier;
the in-phase end of the amplifier is grounded, and the inverting end of the amplifier is connected with the first pin;
the output end of the amplifier is connected with the control unit;
and when the heating temperature of the thermocouple is not higher than the first temperature, the output end of the amplifier outputs the control signal.
Optionally, the non-inverting terminal of the amplifier is grounded through a second resistor;
and/or the inverting terminal of the amplifier is connected with the first pin through a third resistor;
and/or the inverting terminal of the amplifier is connected with the output terminal through a fourth resistor.
Optionally, the control unit includes the first switch; the first switch is provided with a first end, a second end and a control end, the control end is connected with the detection unit, and the first end of the first switch is connected with a power supply;
when the control end receives the control signal, the first end and the second end of the first switch are communicated; when the control end does not receive the control signal, the first end and the second end of the first switch are disconnected;
one end of the controller is connected with the second end of the first switch, and the other end of the controller is grounded.
Optionally, the first switch is a triode or a mos tube.
Optionally, the method further includes: and the cathode of the diode is connected with the second end of the first switch, and the anode of the diode (7) is grounded.
Optionally, a fifth resistor is disposed on a connection line between the control end of the first switch and the detection unit.
Optionally, the method further includes:
and one end of the sixth resistor is connected to a connecting line between the fifth resistor and the control end of the first switch, and the other end of the sixth resistor is connected with the power supply.
The application also provides a cooker which comprises any one of the control circuits provided by the application.
The application provides do not rely on software control in this application provides control circuit and the stove that this application provided, relies on the characteristic of hardware, can guarantee solenoid valve self-closing when software became invalid to the security has been improved.
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; 2. a normally closed switch; 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; 61. a first resistor; 62. a second resistor; 63. a third resistor; 64. a fourth resistor; 65. a fifth resistor; 66. a sixth resistor; 7. and a diode.
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, gas inlet of a cooker is controlled through an electromagnetic valve, specifically through software logic control of a control chip, however, the dependence of the mode on software is high, and when the software fails, the gas inlet of the cooker cannot be closed after flameout, so that gas leakage is caused.
Referring to fig. 1-2, the present application proposes a control circuit for a cooking appliance, including:
the electromagnetic valve 1 comprises a first coil 11 and a second coil 12, wherein a first end of the first coil 11 and a first end of the second coil 12 are grounded; specifically, when the first coil 11 and the second coil 12 of the electromagnetic valve are normally electrified, the electromagnetic valve is opened, the air inlet valve of the cooker can be normally ventilated, and when the first coil 11 and the second coil 12 of the electromagnetic valve are not electrified or the voltage is insufficient, the electromagnetic valve is closed, and the air inlet valve of the cooker is closed.
A thermocouple 3, wherein a first pin 31 of the thermocouple 3 is connected with a second end of the first coil 11; when the heating temperature of the thermocouple 3 is higher than the first temperature, the first coil 11 is powered through the first pin 31; specifically, the thermocouple 3 is used for detecting whether the stove is on fire, the first temperature may be 60 ℃, for example, when the stove is on fire, the heating temperature of the thermocouple is higher than the first temperature to generate an electromotive force, the thermocouple 3 has a first pin and a second pin, when the thermocouple is on heat, the electromotive force of the first pin is lower than that of the second pin, and the second pin may be grounded. When the heating temperature of the thermocouple is higher than the first temperature, a sufficient voltage difference is generated between two ends of the first coil 11, so that the first coil 11 works normally
The negative pressure generating module 4 is used for providing negative pressure; one end of the first resistor 61 is connected with the negative voltage generation module 4, and the other end of the first resistor 61 is connected with the second end of the second coil 12;
a normally closed switch 2, one end of which is connected to one end of the first resistor 61, and the other end of the normally closed switch 2 is connected to the other end of the first resistor 61, wherein the normally closed switch 2 has a controller 21, and the normally closed switch 2 has a controller 21; specifically, when the normally closed switch 2 is closed, the voltage difference between the two ends of the second coil 12 is equal to the negative voltage generated by the negative voltage generating module, at this time, the second coil 12 works normally, and when the normally closed switch 2 is opened, the first resistor 61 is connected between the negative voltage generating module and the second coil 12, because of the voltage dividing effect of the first resistor 61, the voltage on the second coil 12 is insufficient, so that the second coil 12 cannot provide sufficient electromagnetic force when the normally closed switch 2 is opened, and the electromagnetic valve is closed. Optionally, an absolute value of the negative pressure generated by the negative pressure generating module is equal to a voltage of the second coil 12 when the second coil 12 normally works, that is, a pressure difference between the negative pressure generating module and a ground line is only enough for the second coil 12 to normally work, once the first resistor 61 is connected, a divided voltage obtained by the second coil 12 is not enough for the second coil to normally work, and optionally, a resistance value of the first resistor 61 is more than 2 times a resistance value of the second coil 12.
The detection control module 5 is respectively connected with the first pin 31 and the controller 21, and is used for controlling the controller 21 to disconnect the normally closed switch 2 when the heating temperature of the thermocouple 3 is not higher than a first temperature; when the heating temperature of the thermocouple 3 is higher than the first temperature, the normally closed switch 2 is automatically closed.
In this application, when the stove normally fires, thermocouple 3 is heated in flame, when the temperature of being heated is higher than first temperature, thermocouple 3 is for first coil 11 power supply and normal work, normally closed switch is automatic closed simultaneously, so first resistance is short circuited, the both ends of second coil have the voltage difference of enough normal work, and when the stove is put out fire, flame disappears, thermocouple 3 is heated the temperature and is not higher than first temperature, thermocouple 3's first pin 31 can not provide the voltage of enough first coil 11 work, first coil stop work, detect the disconnection of control module 5 control normally closed switch simultaneously, at this moment, first resistance and second coil 12 are established ties, because the partial pressure effect of first resistance, second coil 12 can't obtain sufficient voltage therefore out of work. Both the first coil 11 and the second coil 12 are inactive so that the solenoid is closed, thus ensuring that the inlet air to the burner is closed.
Optionally, the normally closed switch 2 is a normally closed relay; the normally closed relay remains closed in the absence of an external signal.
Optionally, the detection control module 5 includes: a detection unit 51 and a control unit 52; the detection unit 51 is connected with the first pin 31, and when the heating temperature of the thermocouple 3 is not higher than a first temperature, the detection unit 51 outputs a control signal to the control unit 52; the control unit 52 is connected to the controller of the normally closed switch 2, and is configured to control the controller 21 when receiving the control signal, so that the controller 21 turns off the normally closed switch 2.
Optionally, the detecting unit 51 includes an amplifier 511; the in-phase end of the amplifier 511 is grounded, and the out-phase end is connected with the first pin 31; the output end of the amplifier 511 is connected with the control unit 52; when the heated temperature of the thermocouple 3 is not higher than the first temperature, the output end of the amplifier 511 outputs the control signal.
Specifically, referring to fig. 2, when the thermocouple 3 is heated, the electromotive force of the first pin is lower than that of the second pin, and the second pin is grounded, and when the heated temperature of the thermocouple 3 is not higher than the first temperature (i.e., when the furnace is not on fire), the thermocouple does not generate voltage, so that the amplifier outputs a low level, and the low level output by the amplifier is a control signal, and the normally closed switch 2 is controlled to be turned off by the control signal.
Optionally, the non-inverting terminal of the amplifier 511 is grounded through a second resistor 62;
optionally, the inverting terminal of the amplifier 511 is connected to the first pin 31 through a third resistor 63;
alternatively, the amplifier 511 may be an operational amplifier, and an inverting terminal of the amplifier 511 is connected to the output terminal through a fourth resistor 64.
Optionally, the control unit 52 includes the first switch 521; the first switch 521 has a first end, a second end and a control end, the control end is connected with the detection unit 51, and the first end of the first switch 521 is connected with a power supply;
when the control end receives the control signal, the first end and the second end of the first switch 521 are communicated; when the control terminal does not receive the control signal, the first terminal and the second terminal of the first switch 521 are disconnected; one end of the controller 21 is connected to the second end of the first switch, and the other end of the controller 21 is grounded. Optionally, the first switch 521 is a triode or a mos tube.
Specifically, referring to fig. 2, for example, the control circuit has an amplifier, the first switch 521 is a triode, a PNP triode is selected at this time, when the thermocouple is not heated, the PNP triode receives a low-level control signal, the collector and the emitter are connected, and therefore the controller 21 receives current and controls the normally closed switch 2 to be disconnected, so that the voltage of the second coil 12 is insufficient and does not work by using the voltage dividing effect of the first resistor 61, when the temperature of the thermocouple heated is higher than the first temperature, the amplifier outputs a high level, the collector and the emitter of the PNP triode are not connected, and the controller 21 is not powered, so that the normally closed switch 2 is kept closed, the first resistor 61 is shorted, and the second coil 12 is normally powered to work.
Optionally, the method further includes: and the cathode of the diode 7 is connected with the second end of the first switch, and the anode of the diode 7 is grounded. The diode 7 prevents the voltage across the controller 21 from becoming too high.
Optionally, a fifth resistor 65 is disposed on a connection line between the control end of the first switch 521 and the detection unit 51. The fifth resistor 65 can prevent the input current of the control terminal from being too large.
Optionally, the method further includes: a sixth resistor 66, one end of the sixth resistor 66 is connected to a connection line between the fifth resistor 65 and the control end of the first switch 521, and the other end of the sixth resistor 66 is connected to the power supply. At this time, the sixth resistor 66 and the fifth resistor 65 form a voltage dividing circuit, thereby protecting the control terminal.
The application also provides a cooker, which comprises any one of the control circuits provided by the application.
To better explain the control circuit proposed in the present application, please refer to fig. 2, when the stove is on fire, the thermocouple 3 is heated in flame, the heated temperature is higher than the first temperature, so as to generate a negative voltage on the first pin 31, a voltage difference is generated between two ends of the first coil 11, so as to operate normally, meanwhile, the negative voltage on the first pin 31 flows into the inverting end of the amplifier 511 through the third resistor 63, because the inverting end of the amplifier 511 is grounded through the second resistor 62, the output end of the amplifier 511 outputs a high level, the high level flows to the control end of the first switch 521 through the fifth resistor 65, the first switch is a PNP type triode, so that the collector and the emitter are not connected, so that the power supply is not connected with the controller 21, at this time, the normally closed switch 2 is kept closed, so that the first resistor 61 is short-circuited, two ends of the second coil 12 are respectively connected with the ground wire and the negative voltage generating module, the second coil 12 is normally operated and the solenoid is opened. When the cooker is turned off, the heating temperature of the thermocouple 3 is not higher than the first temperature, so the first pin 31 cannot provide enough voltage for the first coil 11 to normally work, meanwhile, the amplifier 511 outputs a low level, the first switch 521 is opened by the low level to enable the collector and the emitter to be conducted, so one end of the controller 21 is communicated with the power supply, and the other end of the controller 21 is grounded, the controller 21 is electrified to work to control the normally closed switch 2 to be disconnected, at the moment, the first resistor 61 is connected with the second coil 12 in series, because the voltage of the first resistor 61 is divided, the voltage of the two ends of the second coil 12 is insufficient, enough electromagnetic force cannot be provided, the attraction state cannot be maintained, and at the moment, the. The control circuit and the stove provided by the application do not depend on software control, and can ensure that the electromagnetic valve is automatically closed when software fails by depending on the characteristics of hardware, so that the safety is improved.
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:
the electromagnetic valve (1) comprises a first coil (11) and a second coil (12), wherein the first end of the first coil (11) and the first end of the second coil (12) are grounded;
a thermocouple (3), wherein a first pin (31) of the thermocouple (3) is connected with a second end of the first coil (11);
a negative pressure generating module (4) for providing negative pressure;
one end of the first resistor (61) is connected with the negative pressure generating module (4), and the other end of the first resistor (61) is connected with the second end of the second coil (12);
a normally closed switch (2), one end of the normally closed switch is connected with one end of the first resistor (61), the other end of the normally closed switch (2) is connected with the other end of the first resistor (61), and the normally closed switch (2) is provided with a controller (21);
the detection control module (5) is respectively connected with the first pin (31) and the controller (21) and is used for controlling the controller (21) to disconnect the normally closed switch (2) when the heating temperature of the thermocouple (3) is not higher than a first temperature; when the heating temperature of the thermocouple (3) is higher than a first temperature, the normally closed switch (2) is automatically closed.
2. The control circuit of claim 1,
the normally closed switch (2) is a normally closed relay;
and/or the presence of a gas in the gas,
the detection control module (5) comprises: a detection unit (51) and a control unit (52);
the detection unit (51) is connected with the first pin (31), and when the heating temperature of the thermocouple (3) is not higher than a first temperature, the detection unit (51) outputs a control signal to the control unit (52);
the control unit (52) is connected with a controller of the normally closed switch (2) and is used for controlling the controller (21) when receiving the control signal, so that the controller (21) disconnects the normally closed switch (2).
3. The control circuit of claim 2,
the detection unit (51) comprises an amplifier (511);
the in-phase end of the amplifier (511) is grounded, and the out-phase end of the amplifier is connected with the first pin (31);
the output end of the amplifier (511) is connected with the control unit (52);
when the heating temperature of the thermocouple (3) is not higher than the first temperature, the output end of the amplifier (511) outputs the control signal.
4. The control circuit of claim 3,
the non-inverting terminal of the amplifier (511) is grounded through a second resistor (62);
and/or the inverting terminal of the amplifier (511) is connected with the first pin (31) through a third resistor (63);
and/or the inverting terminal of the amplifier (511) is connected with the output terminal through a fourth resistor (64).
5. The control circuit according to any one of claims 2 to 4,
the control unit (52) comprising a first switch (521); the first switch (521) is provided with a first end, a second end and a control end, the control end is connected with the detection unit (51), and the first end of the first switch (521) is connected with a power supply;
when the control end receives the control signal, the first end and the second end of the first switch (521) are communicated; when the control end does not receive the control signal, the first end and the second end of the first switch (521) are disconnected;
one end of the controller (21) is connected with the second end of the first switch, and the other end of the controller (21) is grounded.
6. The control circuit of claim 5,
the first switch (521) is a triode or a mos tube.
7. The control circuit of claim 5, further comprising:
and the cathode of the diode (7) is connected with the second end of the first switch, and the anode of the diode (7) is grounded.
8. The control circuit of claim 5,
and a fifth resistor (65) is arranged on a connecting line between the control end of the first switch (521) and the detection unit (51).
9. The control circuit according to claim 6 or 7,
and a fifth resistor (65) is arranged on a connecting line between the control end of the first switch (521) and the detection unit (51).
10. The control circuit of claim 8, further comprising:
and one end of the sixth resistor (66) is connected to a connection line between the fifth resistor (65) and the control end of the first switch (521), and the other end of the sixth resistor (66) is connected with the power supply.
11. The control circuit of claim 9, further comprising:
and one end of the sixth resistor (66) is connected to a connection line between the fifth resistor (65) and the control end of the first switch (521), and the other end of the sixth resistor (66) is connected with the power supply.
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 |
|---|---|---|---|
| CN201921470883.7U CN210662950U (en) | 2019-09-05 | 2019-09-05 | Control circuit and cooking utensils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921470883.7U CN210662950U (en) | 2019-09-05 | 2019-09-05 | Control circuit and cooking utensils |
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| CN210662950U true CN210662950U (en) | 2020-06-02 |
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| CN201921470883.7U Active CN210662950U (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 |
|---|---|---|---|---|
| CN110486757A (en) * | 2019-09-05 | 2019-11-22 | 珠海格力电器股份有限公司 | Control circuit and kitchen range |
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- 2019-09-05 CN CN201921470883.7U patent/CN210662950U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486757A (en) * | 2019-09-05 | 2019-11-22 | 珠海格力电器股份有限公司 | Control circuit and kitchen range |
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