CN114690811B - Temperature control circuit and household appliance - Google Patents
Temperature control circuit and household appliance Download PDFInfo
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- CN114690811B CN114690811B CN202011599112.5A CN202011599112A CN114690811B CN 114690811 B CN114690811 B CN 114690811B CN 202011599112 A CN202011599112 A CN 202011599112A CN 114690811 B CN114690811 B CN 114690811B
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- 238000010438 heat treatment Methods 0.000 claims abstract description 272
- 230000002159 abnormal effect Effects 0.000 claims description 25
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- 238000004140 cleaning Methods 0.000 description 19
- 238000010411 cooking Methods 0.000 description 13
- 230000004044 response Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The application discloses a temperature control circuit and household electrical appliance, wherein the temperature control circuit comprises a selection circuit, and a first protection circuit, a second protection circuit and a heating circuit which are respectively connected with the selection circuit; the selection circuit is used for selecting the first protection circuit or the second protection circuit to be connected with the heating circuit; the first protection circuit is used for responding to the condition that the space where the heating circuit is positioned is in a first temperature state under the condition of being connected with the heating circuit, and controlling the heating circuit to stop working; the second protection circuit is used for responding to the space where the heating circuit is positioned in a second temperature state under the condition of being connected with the heating circuit, and controlling the heating circuit to stop working. By the scheme, temperature control protection in different working modes can be realized.
Description
Technical Field
The present application relates to the field of electronic technologies, and in particular, to a temperature control circuit and a home appliance.
Background
Home appliances including a heating circuit such as an oven are becoming popular because they can heat an object to be heated. In order to meet the requirement that consumers can freely select heating temperature, the household electrical appliance sets different working modes corresponding to different heating temperatures, meanwhile, in order to avoid the lower working mode of temperature from being broken in the working process, when the temperature control of a heating circuit is invalid, and the temperature is always increased, the temperature control protection of the existing temperature control circuit is always carried out only in a very high temperature state, and the temperature control protection is single in different working modes.
Based on this, how to realize temperature control protection in different working modes becomes a problem to be solved.
Disclosure of Invention
The application provides a temperature control circuit and household electrical appliance, which can realize temperature control protection in different working modes.
The first aspect of the application provides a temperature control circuit, which comprises a selection circuit, a first protection circuit, a second protection circuit and a heating circuit, wherein the first protection circuit, the second protection circuit and the heating circuit are respectively connected with the selection circuit; the selection circuit is used for selecting the first protection circuit or the second protection circuit to be connected with the heating circuit; the first protection circuit is used for responding to the condition that the space where the heating circuit is located is in a first temperature state under the condition that the first protection circuit is connected with the heating circuit, and controlling the heating circuit to stop working; and the second protection circuit is used for responding to the condition that the space where the heating circuit is positioned is in a second temperature state under the condition that the second protection circuit is connected with the heating circuit, and controlling the heating circuit to stop working.
Wherein, under the condition that the heating circuit is in a first working mode, the selection circuit selects the first protection circuit to be connected with the heating circuit; the selection circuit selects the second protection circuit to be connected with the heating circuit under the condition that the heating circuit is in a second working mode; the working temperature of the heating circuit in the first working mode is smaller than that in the second working mode, and the temperature of the first temperature state is smaller than that of the second temperature state.
Wherein the first protection circuit and the second protection circuit are connected in parallel between a power supply terminal and the selection circuit; the first protection circuit and the second protection circuit are connected with the selection circuit through disconnecting the power supply end so as to control the heating circuit to stop working; and/or, the first protection circuit and the second protection circuit are temperature controllers.
Wherein the selection circuit includes a first switching element and a second switching element; the two ends of the first switch element are respectively connected with the first protection circuit and the heating circuit, and the two ends of the second switch element are respectively connected with the second protection circuit and the heating circuit.
Wherein at least one of the first switching element and the second switching element is a relay; and/or the temperature control circuit further comprises a control circuit, wherein the control circuit is respectively connected with the controlled ends of the first switch element and the second switch element and is used for controlling the switch states of the first switch element and the second switch element based on the working mode of the heating circuit so as to select the first protection circuit or the second protection circuit to be connected with the heating circuit.
The heating circuit comprises at least one group of heating sub-circuits connected in parallel, each group of heating sub-circuits comprises a third switching element and a heating element which are connected in series, and one end of each group of heating sub-circuits is connected with the selection circuit so as to be connected with the first protection circuit or the second protection circuit through the selection circuit.
Wherein the third switching element is a relay; and/or the temperature control circuit further comprises a control circuit which is respectively connected with the controlled end of each third switching element and used for controlling the third switching elements with different numbers to be closed based on the working mode of the heating circuit.
A second aspect of the present application provides an electric home appliance, including the temperature control circuit of the first aspect.
The household appliance further comprises a cavity for accommodating an object to be heated, wherein the heating circuit in the temperature control circuit is arranged in the cavity and used for heating a space in the cavity; the first protection circuit and the second protection circuit of the temperature control circuit are used for controlling whether the heating circuit stops working or not based on the temperature of the cavity.
Wherein the home appliance further comprises at least one of the following functional circuits: the lighting circuit is used for lighting the space in the cavity; the exhaust circuit is used for exhausting the space in the cavity and works with different powers based on different working modes of the heating circuit; the hot air circuit is used for providing hot air for the space in the cavity under the condition that the heating circuit is in a first working mode; and the controlled locking circuit is used for locking the door on the cavity under the condition that the heating circuit is in the second working mode.
In the above scheme, the temperature control circuit comprises a selection circuit, and a first protection circuit, a second protection circuit and a heating circuit which are respectively connected with the selection circuit, so that under the condition that the selection circuit selects the first protection circuit to be connected with the heating circuit, the first protection circuit can respond to the condition that the space where the heating circuit is located is in a first temperature state to control the heating circuit to stop working, and under the condition that the selection circuit selects the second protection circuit to be connected with the heating circuit, the second protection circuit can respond to the condition that the space where the heating circuit is located is in a second temperature state to control the heating circuit to stop working, and then the first protection circuit and the second protection circuit respectively respond to different temperature states of the space where the heating circuit is located to control the heating circuit to stop working, so that temperature control protection under different working modes is realized.
Drawings
FIG. 1 is a schematic diagram of a temperature control circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of an embodiment of the home appliance of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. The terms "first," "second," and the like herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship. Furthermore, herein, "a number" means one or more, and "a number" means two or more than two.
Electronic products such as home appliances and the like comprising a heating circuit often have different working modes, and the temperature states of spaces where the heating circuit is located are different in the different working modes. In order to keep the normal function of the household electrical appliance and ensure the safety of a user when the household electrical appliance works normally, and stop the heating circuit under abnormal working conditions such as abnormal high temperature and the like to achieve the temperature control effect, the application respectively sets two protection circuits for controlling the working state of the heating circuit according to different temperature states of the space where the heating circuit is positioned, thereby realizing separated temperature control protection.
Referring to fig. 1, fig. 1 is a schematic diagram of a temperature control circuit according to an embodiment of the application.
The temperature control circuit 100 includes a selection circuit 30, a first protection circuit 10, a second protection circuit 20, and a heating circuit 40, which are connected to the selection circuit 30, respectively. The selection circuit 30 is used for selecting the first protection circuit 10 or the second protection circuit 20 to be connected with the heating circuit 40. The first protection circuit 10 is configured to control the heating circuit 40 to stop operating in response to the space where the heating circuit 40 is located being in the first temperature state when connected to the heating circuit 40. The second protection circuit 20 is configured to control the heating circuit 40 to stop working in response to the space where the heating circuit 40 is located being in the second temperature state when connected to the heating circuit 40.
The operating temperature of the heating circuit 40 is different in different modes of operation. That is, the heating power of the heating circuit 40 is different corresponding to different operation modes, so that the temperature state of the space where the heating circuit 40 is located is different. In the temperature control circuit 100, if the same protection circuit is used to control the operation state of the heating circuit 40, the temperature control protection in different operation modes cannot be realized. For example, if the temperature at which the protection circuit stops operating the heating circuit 40 is too low, the operation mode in which the operation temperature is higher than that is not performed, and if the temperature at which the protection circuit stops operating the heating circuit 40 is too high, the protection function of the protection circuit fails and the heating circuit 40 continues to operate when an abnormally high temperature occurs in the operation mode in which the operation temperature is lower than that. Since the temperature states corresponding to the first protection circuit 10 and the second protection circuit 20 stopping the operation of the heating circuit 40 are different, the selection circuit 30 is used to select different protection circuits, so that the temperatures of the protection circuits connected with the heating circuit 40 playing a protection role are different, and the temperature control protection of different working modes is realized. The selection circuit 30 may select the first protection circuit 10 to be connected to the heating circuit 40, so that when the temperature state exceeds the first temperature state, temperature control protection is achieved by stopping the operation of the heating circuit 40; the second protection circuit 20 may be selectively connected to the heating circuit 40, so that when the temperature state exceeds the second temperature state, the operation of the heating circuit 40 is stopped to realize the temperature control protection.
Since the temperatures at which the different protection circuits play a protection role are different when the first protection circuit 10 and the second protection circuit 20 control the heating circuit 40 to stop working, the selection circuit 30 can be used to select the different protection circuits to control the heating circuit 40 in the different temperature states to stop heating according to the different temperature states, thereby realizing the separated temperature control protection. It can be understood that the first temperature state and the second temperature state may be the same, so that different protection circuits may be used respectively, and in the same temperature state, the operation state of the heating circuit 40 is controlled, if an abnormally high temperature condition occurs, the protection circuits exert protection effects to stop the operation of the heating circuit 40, and after one protection circuit fails, the other protection circuit may be replaced, or different protection circuits may be used to control the operation state of the heating circuit 40 in a rotating manner, or different protection circuits may be used to control the operation state of the heating circuit 40 at the same time.
The selection circuit 30 may select a protection circuit corresponding to the operation mode according to the operation mode of the heating circuit 40 to be connected to the heating circuit 40. The temperature sensing positions of the different protection circuits are very close and equivalent to the temperature sensing at the same position, so that the same heating circuit 40 sets corresponding temperature states belonging to abnormal high temperature conditions in different working modes. The heating circuit 40 in different working modes judges that the temperature of the abnormal high temperature is different, and the corresponding protection circuits in different working modes are different, so that the different protection circuits respectively play a role in protection at different temperatures, and the effect of separated temperature control protection is achieved. In an embodiment, the selection circuit 30 selects the first protection circuit 10 to be connected to the heating circuit 40 when the heating circuit 40 is in the first operation mode; in the case where the heating circuit 40 is in the second operation mode, the selection circuit 30 selects the second protection circuit 20 to be connected to the heating circuit 40. The operating temperature of the heating circuit 40 in the first operating mode is less than that in the second operating mode, and the temperature of the first temperature state is less than that of the second temperature state. In this embodiment, the number of protection circuits corresponds to the number of working modes one by one, but the number of protection circuits and the number of working modes can be set in a self-defined manner. In another embodiment, different protection circuits are respectively corresponding to different operation modes, and one operation mode may be used to perform joint protection corresponding to a plurality of protection circuits, which is not limited herein.
The selection circuit 30 selects different protection circuits according to the working mode of the heating circuit 40 to be connected with the heating circuit 40, so that in the first working mode, the heating circuit 40 is connected with the first protection circuit 10, when the space where the heating circuit 40 is positioned is at the temperature of the first temperature state, the first protection circuit 10 plays a role in protection, the heating circuit 40 is controlled to stop working, and further in the first working mode with lower working temperature, if abnormal states such as abnormal high temperature occur, the first protection circuit 10 can control the heating circuit 40 to stop heating in advance; in the second operation mode, the heating circuit 40 is connected to the second protection circuit 20, and when the space where the heating circuit 40 is located is at the temperature of the second temperature state, the second protection circuit 20 controls the heating circuit 40 to stop working, so that in the second operation mode with relatively high working temperature, if abnormal conditions such as abnormal high temperature occur, the second protection circuit 20 can control the heating circuit 40 to stop heating. It can be understood that, since the operating temperature of the heating circuit 40 in the first operating mode is smaller than that in the second operating mode, if the first protection circuit 10 is still used to control the operating state of the heating circuit 40 in the second operating mode, the space where the heating circuit 40 is located is in a higher temperature state than the first temperature state, the first protection circuit 10 must control the heating circuit 40 to stop working, and the second operating mode cannot be executed; if the first protection circuit 10 is not provided in the first operation mode and the second protection circuit 20 is provided in the second operation mode, the space where the heating circuit 40 is located is in the ultra-high temperature state of the second temperature state, the heating circuit 40 will stop working, and the temperature control protection cannot be performed in abnormal states such as abnormal high temperature in the first operation mode. Therefore, since the temperature of the second temperature state is greater than that of the first temperature state, the space where the heating circuit 40 is located is in a higher temperature state than that of the first temperature state, that is, in the normal high temperature state in the second operation mode, the heating circuit 40 does not stop heating halfway, but stops the operation of the heating circuit 40 only in the high temperature of the second temperature state in the abnormal high temperature state.
Referring to fig. 1, in one embodiment, to selectively connect the protection circuit with the heating circuit 40, the selection circuit 30 includes a first switching element 31 and a second switching element 32; the first switching element 31 has two ends connected to the first protection circuit 10 and the heating circuit 40, respectively, and the second switching element 32 has two ends connected to the second protection circuit 20 and the heating circuit 40, respectively. In the first operation mode, the first switching element 31 is in a closed and on state, the second switching element 32 is in an open state, and when detecting that the temperature state of the space where the heating circuit 40 is located exceeds the temperature of the first temperature state, an abnormal operation state indicating an abnormally high temperature occurs in the first operation mode, and the first protection circuit 10 plays a role in protection, so that the heating circuit 40 stops operating. In the second operation mode, the first switching element 31 is in an open state, the second switching element 32 is in a closed state, and when detecting that the temperature state of the space where the heating circuit 40 is located exceeds the temperature of the second temperature state, an abnormal operation state indicating an abnormally high temperature occurs in the second operation mode, and the second protection circuit 20 plays a role in protection, so that the heating circuit 40 stops operating. At least one of the second switching element 32 and the first switching element 31 is a relay, and the first switching element 31 and the second switching element 32 may be connected to the heating circuit 40 by selecting the corresponding first protection circuit 10 and second protection circuit 20, and the specific element type is not particularly limited.
In order to better select the protection circuit connected to the heating circuit 40, and implement the split temperature control protection, the temperature control circuit 100 further includes a control circuit connected to the controlled ends of the first switching element 31 and the second switching element 32, respectively, for controlling the switching states of the first switching element 31 and the second switching element 32 based on the operation mode of the heating circuit 40, so as to select the first protection circuit 10 or the second protection circuit 20 to be connected to the heating circuit 40. When the operation mode of the heating circuit 40 is the first operation mode, the control circuit controls the first switch element 31 to be turned on and the second switch element 32 to be turned off, the first protection circuit 10 is connected with the heating circuit 40 through the first switch element 31, the second protection circuit 20 does not operate, and when the temperature of the space where the heating circuit 40 is detected to be higher than the temperature of the first temperature state, the first protection circuit 10 plays a protection role, and the heating circuit 40 is controlled to stop heating. When the operation mode of the heating circuit 40 is the second operation mode, the control circuit controls the second switching element 32 to be turned on and the first switching element 31 to be turned off, the second protection circuit 20 is connected with the heating circuit 40 through the second switching element 32, the first protection circuit 10 does not operate, and when the temperature of the space where the heating circuit 40 is detected to be in the second temperature state exceeds the second temperature state, the second protection circuit 20 plays a protection role, and the heating circuit 40 is controlled to stop heating. Therefore, the working modes of the heating circuit 40, the protection circuits, the switching elements and the temperature states of the space where the heating circuit 40 is located are all in one-to-one correspondence, after the working modes of the heating circuit 40 are determined, the control circuit can control the corresponding switching elements to be closed, so that the corresponding protection circuits are selected to be connected with the heating circuit 40, and then when the heating circuit 40 detects that the space where the heating circuit 40 is located is in the temperature state corresponding to the working modes in different working modes, the corresponding protection circuits play a role of protection, and the heating circuit 40 is controlled to stop heating.
The first protection circuit 10 and the second protection circuit 20 are connected in parallel between the power supply terminal and the selection circuit 30, and the other end of the selection circuit 30 is connected with the heating circuit 40, so that the first protection circuit 10 and the second protection circuit 20 control the heating circuit 40 to stop working by disconnecting the power supply terminal from the selection circuit 30. The power source terminal may be connected to the two protection circuits using a junction box or the like for protecting the electric wires and connecting the electric wires. The first protection circuit 10 or the second protection circuit 20 is a circuit capable of realizing automatic on-off according to temperature change, including but not limited to a temperature controller. In order to disconnect the power supply end from the selection circuit 30 when the temperature of the protection circuit rises, so as to control the working state of the heating circuit 40, the first protection circuit 10 may select a normally closed temperature controller with a lower trip temperature, and the second protection circuit 20 may select a normally closed temperature controller with a higher trip temperature, so that when the temperature of the space where the heating circuit 40 is located rises, the contact of the temperature controller is disconnected, the connection between the power supply end and the selection circuit 30 is disconnected, and the whole temperature control circuit 100, including the heating circuit 40, stops working. In an application embodiment, the temperature of the first temperature state is smaller than the second temperature state, and the first protection circuit 10 may be a low-temperature jump-off type snap-action temperature controller, and when the space where the heating circuit 40 is located is in the first temperature state, the heating circuit 40 is controlled to stop working; the second protection circuit 20 is a high temperature snap-off type temperature controller, and when the space where the heating circuit 40 is located is in the second temperature state, the heating circuit 40 is controlled to stop working.
In one embodiment, referring to fig. 2, the heating circuit 40 includes at least one group of heating sub-circuits 41 connected in parallel, each group of heating sub-circuits 41 includes a third switching element 411 and a heating element 412 connected in series, and one end of each group of heating sub-circuits 41 is connected to the selection circuit 30 to be connected to the first protection circuit 10 or the second protection circuit 20 through the selection circuit 30. The number of groups of the heating sub-circuits 41 can be set in a self-defined manner according to the requirement, for example, 2 groups, 6 groups, etc., and the heating sub-circuits 41 in the working state are different in the number of groups of the heating sub-circuits 40 in different working modes, for example, when the working temperature of the heating sub-circuits 40 in the second working mode is greater than the working temperature in the first working mode, the number of groups of the heating sub-circuits 41 in the working state in the first working mode is smaller than the second working mode. The third switching element 411 may be a relay or the like capable of controlling the heating element 412 to be turned on, and the specific element type is not particularly limited. The heating element 412 includes, but is not limited to, a heating tube, a heating wire, a halogen tube, etc. capable of generating heat to achieve a spatial temperature change. In addition, in the case that the temperature control circuit 100 includes a control circuit, the control circuit is respectively connected to the controlled end of each third switching element 411, and is configured to control the third switching elements 411 to be turned on and further control the heating elements 412 to generate heat according to the operation mode of the heating circuit 40.
In the above manner, when the selection circuit 30 selects that the first protection circuit 10 is connected to the heating circuit 40, the first protection circuit 10 may control the heating circuit 40 to stop working in response to the space where the heating circuit 40 is located being in the first temperature state, and when the selection circuit 30 selects that the second protection circuit 20 is connected to the heating circuit 40, the second protection circuit 20 may control the heating circuit 40 to stop working in response to the space where the heating circuit 40 is located being in the second temperature state, so that the first protection circuit 10 and the second protection circuit 20 control the heating circuit 40 to stop heating in response to the different temperature states of the space where the heating circuit 40 is located, respectively, thereby realizing the split type temperature control protection. Under the condition that the working temperature of the heating circuit 40 in normal operation is low, if abnormal conditions such as abnormal high temperature occur, the first protection circuit 10 can control the heating circuit 40 to stop heating in advance; in the case where the operating temperature of the normal operation of the heating circuit 40 is high, the temperature at which the second protection circuit 20 performs the protection is higher than the operating temperature of the normal operation, and abnormal conditions such as abnormal high temperature occur without interfering with the normal operation of the heating circuit 40, and the second protection circuit 20 controls the heating circuit 40 to stop heating.
In order to realize the temperature control protection of the household electrical appliance, the temperature control circuit is widely applied to the household electrical appliance. Referring to fig. 2, fig. 2 is a schematic diagram of an embodiment of an electrical home appliance according to the present application.
The home device 1000 is an electronic device including any of the temperature control circuit embodiments described above, including but not limited to an oven, microwave oven, and the like. The household electrical appliance 1000 further comprises a cavity for accommodating an object to be heated, wherein the heating circuit 40 in the temperature control circuit is arranged in the cavity and is used for heating the space in the cavity; the first protection circuit 10 and the second protection circuit 20 of the temperature control circuit are used for controlling whether the heating circuit 40 stops working or not based on the temperature of the space in the cavity. Since the heating circuit 40 of the temperature control circuit is disposed in the cavity, the temperature of the space in the cavity corresponds to the temperature state of the space in which the heating circuit 40 is disposed, so that the first protection circuit 10 of the temperature control circuit performs a protection function when the temperature state of the space in the cavity is a first temperature state, so that the heating circuit 40 stops working, and the second protection circuit 20 of the temperature control circuit performs a protection function when the temperature state of the space in the cavity is a second temperature state, so that the heating circuit 40 stops working. The remaining description of the temperature control circuit can refer to any one of the above embodiments of the temperature control circuit, and will not be repeated herein.
In an embodiment, the home device 1000 further includes at least one of the following functional circuits: an illumination circuit 60 for illuminating a space within the cavity; the exhaust circuit 70 is used for exhausting the space in the cavity, and the exhaust circuit 70 works with different powers based on different working modes of the heating circuit 40; a hot air circuit 80 for supplying hot air to the space within the cavity in the case where the heating circuit 40 is in the first operation mode; a controlled lock circuit 90 for locking the door on the cavity when the heating circuit 40 is in the second mode of operation.
The lighting circuit 60, the air exhaust circuit 70, the hot air circuit 80, and the controlled lock circuit 90 each include a functional element and a fourth switching element matched thereto. Wherein the functional elements of the lighting circuit 60 include elements for lighting such as a burner lamp. The functional elements of the exhaust circuit 70 may be heat dissipating elements such as an exhaust fan that includes a low power mode of operation corresponding to a cooking mode of operation of the heating circuit 40 of the oven and a high power mode of operation corresponding to a high temperature self-cleaning mode of operation of the heating circuit 40 of the oven. The functional element of the hot air circuit 80 may be a hot air motor. The functional element of the controlled lock circuit 90 may be a door lock. The oven comprises control circuits which are respectively connected with the controlled ends of the fourth switching elements corresponding to each functional circuit and used for controlling the switching states of the corresponding fourth switching elements and further controlling the working states of the corresponding functional circuits. The exhaust circuit 70 includes a low power operation mode and a high power operation mode, which respectively correspond to the first operation mode and the second operation mode of the heating circuit 40 of the home appliance 1000, so that the two fourth switching elements of the exhaust circuit 70 respectively implement the low power operation mode and the high power operation mode. The fourth switching element of any of the functional circuits described above includes, but is not limited to, a relay. The lighting circuit 60, the exhaust circuit 70, the hot air circuit 80 and the controlled lock circuit 90 are not controlled by the protection circuit, and the protection circuit plays a role in temperature control and protection, so that when the heating circuit 40 stops heating, the lighting circuit 60, the exhaust circuit 70, the hot air circuit 80 and the controlled lock circuit 90 still work normally.
In one embodiment, the home device 1000 further includes a temperature sensor 50. The temperature sensor 50 is used for acquiring and sending the temperature of the cavity of the home appliance 1000 to the control circuit, so that the control circuit controls the third switch element 411 to be turned off, and further controls the heating circuit 40 to stop heating. Unlike the temperature sensor 50, which is turned on and off by the third switching element 411, the heating circuit 40 is controlled to stop operating, and the protection circuit controls the heating circuit 40 to stop heating by disconnecting the power source terminal from the selection circuit 30, thereby reducing the temperature of the heating circuit 40.
In this way, the home appliance 1000 includes the temperature control circuit, and the temperature control circuit can realize temperature control protection in different working modes, so that the service life of the home appliance 1000 can be prolonged.
To further understand the operation principle of the home appliance 1000, the home appliance 1000 is taken as an oven for example. The oven has the operational mode of cooking and high temperature automatically cleaning, and the operating temperature of the heating circuit 40 of oven is lower than when high temperature automatically cleaning when cooking, and wherein, under the high temperature automatically cleaning operational mode, the heating circuit 40 of oven heats the space that is located to about 450 ℃, carbonizes greasy dirt molecule to this, can wipe the greasy dirt easily under the high temperature automatically cleaning operational mode of oven.
In one application embodiment, the oven includes a temperature control circuit, a cavity, a temperature sensor 50, an illumination circuit 60, an exhaust circuit 70, a hot air circuit 80, a controlled lock circuit 90. Wherein the lighting circuit 60 comprises a top burner lamp 61 and a fourth switching element 62 thereof; the exhaust circuit 70 includes an exhaust fan 71, and a fourth switching element 72 and a fourth switching element 73; the hot air circuit 80 comprises a hot air motor 81 and its fourth switching element 82, and the controlled lock circuit 90 comprises a door lock 91 and its fourth switching element 92. The first working mode of the oven is a cooking mode, and the second working mode is a high-temperature self-cleaning mode. In the temperature control circuit of the oven, the temperature control circuit comprises two protection circuits, the protection circuits are temperature controllers, a first switch element 31 and a second switch element 32 are used as a selection circuit 30, a heating circuit 40 is 4 groups of heating sub-circuits 41 which are connected in parallel, each group of heating sub-circuits 41 comprises a third switch element 411 and a heating element 412 which are connected in series, the first switch element 31, the second switch element 32 and the third switch element 411 are all relays, and the heating element 412 is a heating tube. The first protection circuit 10 and the second protection circuit 20 are connected in parallel, and then one end of the first protection circuit 10 and one end of the second protection circuit 20 are connected to the power supply end, the other end of the first protection circuit 10 is connected to the heating circuit 40 through the first switching element 31, and the other end of the second protection circuit 20 is connected to the heating circuit 40 through the second switching element 32.
In the cooking mode of the oven, the second switching element 32 is turned off, the second protection circuit 20 does not operate, but the first protection circuit 10 controls the heating circuit 40 to be in a non-operating state, and the heating is terminated; in the high-temperature self-cleaning mode of the oven, the first switching element 31 is turned off, the first protection circuit 10 does not operate, but the second protection circuit 20 controls the heating circuit 40 to be in a non-operating state, and the heating is terminated. The specific working principle is as follows:
in the cooking mode of the toaster, the first switching element 31 of the selection circuit 30 is turned on, and thus the thermostat serving as the first protection circuit 10 is turned on, and the heating circuit 40 provided in the toaster cavity starts to operate, and the toaster is in a normal cooking state. When the temperature of the space in the cavity reaches the first temperature state, the first protection circuit 10 disconnects the power end from the first switch element 31 to control the heating circuit 40 to stop heating, so that the temperature controller of the oven is tripped in advance in an abnormal state of the cooking mode, and the reduction of the service life of the whole machine of the oven and the elements thereof due to the over-high temperature is avoided.
In the high temperature self-cleaning mode of the oven, the second switching element 32 of the selection circuit 30 is turned on, so that the temperature controller serving as the second protection circuit 20 is turned on, and the heating circuit 40 provided in the oven cavity heats the space in the cavity, and the oven is in a normal high temperature self-cleaning state. Since the operating temperature of the heating circuit 40 in the cooking mode is lower than that in the high-temperature self-cleaning mode, the temperature in the first temperature state is lower than that in the second temperature state, so that in the high-temperature self-cleaning state, even if the temperature of the space in the cavity is higher, the temperature controller serving as the second protection circuit 20 in the normal high-temperature self-cleaning mode is not cut off halfway, but when the temperature of the space in the cavity is detected to reach the second temperature state, the second protection circuit 20 plays a role in temperature control protection so as to control the heating circuit 40 to stop working, and temperature control protection in the high-temperature self-cleaning mode of the oven is realized.
Therefore, for different working modes, different protection circuits are selected to control the working state of the heating circuit 40, on one hand, in the cooking mode with lower temperature state, the heating circuit 40 works normally and at abnormally high temperature in the cooking mode, the first protection circuit 10 stops the heating circuit 40 from heating, so that the early jump of the oven in the abnormal state of the cooking mode is realized; on the other hand, in the high-temperature self-cleaning mode with a higher temperature state, the heating circuit 40 works normally, and in the high-temperature self-cleaning mode, the first protection circuit 10 with a lower jump-off temperature specification does not work, the temperature controller cannot jump off midway, but when the space where the heating circuit 40 is located is in the second temperature state, the abnormal high temperature is indicated in the high-temperature self-cleaning mode, so that the second protection circuit 20 controls the heating circuit 40 to stop working. When the oven is in a normal working mode, the normal function can be kept and the safety of a user is ensured; and when the temperature of the oven is abnormal, the heating of the heating circuit 40 can be stopped in time, the service life of the oven element is reduced due to abnormal high temperature, and the safety of a user is ensured.
Compared with the protection circuit with fixed temperature control temperature designed only in the high-temperature self-cleaning mode, the protection circuit cannot protect against abnormal high temperature in the cooking function, the heating circuit 40 is often controlled to stop working only in the temperature state of the space where the heating circuit 40 is located and under the severe condition, and the temperature control protection is often brought too late, so that the service lives of the oven and elements thereof are greatly reduced. The second protection circuit 20 can prevent the oven from being disconnected and disabled in the middle of the normal high-temperature self-cleaning state and stop the operation of the heating circuit 40 in the abnormal state, so that the high-temperature self-cleaning operation mode can be normally performed on the premise of reducing the service life loss of the oven.
The foregoing is only illustrative of the present application and is not to be construed as limiting the scope of the application, and all equivalent structures or equivalent flow modifications which may be made by the teachings of the present application and the accompanying drawings or which may be directly or indirectly employed in other related art are within the scope of the application.
Claims (9)
1. The temperature control circuit is characterized by comprising a selection circuit, a first protection circuit, a second protection circuit and a heating circuit, wherein the first protection circuit, the second protection circuit and the heating circuit are respectively connected with the selection circuit;
the selection circuit is used for selecting the first protection circuit or the second protection circuit to be connected with the heating circuit;
the first protection circuit is used for responding to the condition that the space where the heating circuit is located is in a first temperature state under the condition that the first protection circuit is connected with the heating circuit, and controlling the heating circuit to stop working;
The second protection circuit is used for responding to the condition that the space where the heating circuit is located is in a second temperature state under the condition that the second protection circuit is connected with the heating circuit, and controlling the heating circuit to stop working;
The temperature control circuit is used for stopping the heating circuit under abnormal working conditions of abnormally high temperature; the first protection circuit and the second protection circuit are temperature controllers and are circuits capable of realizing automatic on-off according to temperature change; the first protection circuit and the second protection circuit are connected in parallel between the power end and the selection circuit, and the first protection circuit and the second protection circuit are connected with the selection circuit by disconnecting the power end so as to control the heating circuit to stop working.
2. The temperature control circuit according to claim 1, wherein the selection circuit selects the first protection circuit to be connected with the heating circuit in a case where the heating circuit is in a first operation mode; the selection circuit selects the second protection circuit to be connected with the heating circuit under the condition that the heating circuit is in a second working mode;
The working temperature of the heating circuit in the first working mode is smaller than that in the second working mode, and the temperature of the first temperature state is smaller than that of the second temperature state.
3. The temperature control circuit of claim 1, wherein the selection circuit comprises a first switching element and a second switching element; the two ends of the first switch element are respectively connected with the first protection circuit and the heating circuit, and the two ends of the second switch element are respectively connected with the second protection circuit and the heating circuit.
4. The temperature control circuit of claim 3, wherein at least one of the first switching element and the second switching element is a relay; and/or the number of the groups of groups,
The temperature control circuit further comprises a control circuit which is respectively connected with the controlled ends of the first switch element and the second switch element and is used for controlling the switch states of the first switch element and the second switch element based on the working mode of the heating circuit so as to select the first protection circuit or the second protection circuit to be connected with the heating circuit.
5. The temperature control circuit according to claim 1, wherein the heating circuit includes at least one group of heating sub-circuits connected in parallel, each group of the heating sub-circuits includes a third switching element and a heating element connected in series, and one end of each group of the heating sub-circuits is connected to the selection circuit to be connected with the first protection circuit or the second protection circuit through the selection circuit.
6. The temperature control circuit of claim 5, wherein the third switching element is a relay; and/or the number of the groups of groups,
The temperature control circuit further comprises a control circuit which is respectively connected to the controlled end of each third switching element and used for controlling the third switching elements to be closed in different numbers based on the working mode of the heating circuit.
7. An electrical home appliance comprising a temperature control circuit as claimed in any one of claims 1 to 6.
8. The apparatus of claim 7, further comprising a chamber for receiving an object to be heated, wherein,
The heating circuit in the temperature control circuit is arranged in the cavity and is used for heating the space in the cavity;
The first protection circuit and the second protection circuit of the temperature control circuit are used for controlling whether the heating circuit stops working or not based on the temperature of the cavity.
9. The home appliance of claim 8, further comprising at least one functional circuit of:
The lighting circuit is used for lighting the space in the cavity;
The exhaust circuit is used for exhausting the space in the cavity and works with different powers based on different working modes of the heating circuit;
The hot air circuit is used for providing hot air for the space in the cavity under the condition that the heating circuit is in a first working mode;
and the controlled locking circuit is used for locking the door on the cavity under the condition that the heating circuit is in the second working mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599112.5A CN114690811B (en) | 2020-12-29 | 2020-12-29 | Temperature control circuit and household appliance |
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| CN202011599112.5A CN114690811B (en) | 2020-12-29 | 2020-12-29 | Temperature control circuit and household appliance |
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| CN114690811B true CN114690811B (en) | 2024-04-19 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1529561A (en) * | 1976-08-26 | 1978-10-25 | Litton Industries Inc | Microwave oven blower interlock circuit |
| JPH09105522A (en) * | 1995-10-11 | 1997-04-22 | Matsushita Electric Ind Co Ltd | Cooking apparatus |
| CN2281736Y (en) * | 1997-01-17 | 1998-05-20 | 广东美的集团股份有限公司 | Electronic temperature limited multifunction electric cooker |
| CN201042382Y (en) * | 2007-07-11 | 2008-04-02 | 袁振华 | Novel dual-purpose pan |
| CN202649841U (en) * | 2012-06-05 | 2013-01-02 | 安徽理士电源技术有限公司 | Storage battery oven control circuit |
| CN204091656U (en) * | 2014-04-23 | 2015-01-14 | 九阳股份有限公司 | A kind of electric food warmer of anti-dry |
| CN204192349U (en) * | 2014-11-25 | 2015-03-11 | 冯小虎 | A kind of electronic temperature-sensing type energy-saving prevention excessive pressure electric cooker |
| CN205083270U (en) * | 2015-10-30 | 2016-03-16 | 浙江绍兴苏泊尔生活电器有限公司 | Heating container |
| CN207166797U (en) * | 2017-09-13 | 2018-03-30 | 广东美的生活电器制造有限公司 | Safety protective circuit and household heating electrical equipment for household heating electrical equipment |
| CN207200262U (en) * | 2017-09-29 | 2018-04-06 | 广东美的生活电器制造有限公司 | Computer heating control protection circuit and firing equipment |
| CN208551247U (en) * | 2017-11-08 | 2019-03-01 | 广东美的生活电器制造有限公司 | Liquid heater |
| CN110007700A (en) * | 2019-04-09 | 2019-07-12 | 中山百得厨卫有限公司 | A kind of circuit control formula oven |
-
2020
- 2020-12-29 CN CN202011599112.5A patent/CN114690811B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1529561A (en) * | 1976-08-26 | 1978-10-25 | Litton Industries Inc | Microwave oven blower interlock circuit |
| JPH09105522A (en) * | 1995-10-11 | 1997-04-22 | Matsushita Electric Ind Co Ltd | Cooking apparatus |
| CN2281736Y (en) * | 1997-01-17 | 1998-05-20 | 广东美的集团股份有限公司 | Electronic temperature limited multifunction electric cooker |
| CN201042382Y (en) * | 2007-07-11 | 2008-04-02 | 袁振华 | Novel dual-purpose pan |
| CN202649841U (en) * | 2012-06-05 | 2013-01-02 | 安徽理士电源技术有限公司 | Storage battery oven control circuit |
| CN204091656U (en) * | 2014-04-23 | 2015-01-14 | 九阳股份有限公司 | A kind of electric food warmer of anti-dry |
| CN204192349U (en) * | 2014-11-25 | 2015-03-11 | 冯小虎 | A kind of electronic temperature-sensing type energy-saving prevention excessive pressure electric cooker |
| CN205083270U (en) * | 2015-10-30 | 2016-03-16 | 浙江绍兴苏泊尔生活电器有限公司 | Heating container |
| CN207166797U (en) * | 2017-09-13 | 2018-03-30 | 广东美的生活电器制造有限公司 | Safety protective circuit and household heating electrical equipment for household heating electrical equipment |
| CN207200262U (en) * | 2017-09-29 | 2018-04-06 | 广东美的生活电器制造有限公司 | Computer heating control protection circuit and firing equipment |
| CN208551247U (en) * | 2017-11-08 | 2019-03-01 | 广东美的生活电器制造有限公司 | Liquid heater |
| CN110007700A (en) * | 2019-04-09 | 2019-07-12 | 中山百得厨卫有限公司 | A kind of circuit control formula oven |
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|---|---|
| CN114690811A (en) | 2022-07-01 |
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