CN214128209U - Heating control circuit of electric heating appliance and electric heating appliance - Google Patents
Heating control circuit of electric heating appliance and electric heating appliance Download PDFInfo
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- CN214128209U CN214128209U CN202022633936.1U CN202022633936U CN214128209U CN 214128209 U CN214128209 U CN 214128209U CN 202022633936 U CN202022633936 U CN 202022633936U CN 214128209 U CN214128209 U CN 214128209U
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Abstract
The utility model discloses an electric heating appliance's heating control circuit and electric heating appliance belongs to the kitchen appliances field, the control circuit of the heating load circuit, the control heating load circuit break-make of connecting mains supply including both ends does with connect mains supply control circuit provides the power supply circuit of weak current voltage, and heating load circuit includes heating load and establishes ties the first fuse that is used for providing overheat protection in heating load one side, and control circuit is including the MCU of connecting at the switching element of heating load opposite side and control switch element action, and it has the second fuse to establish ties between power supply circuit and the control circuit for switching off the switch element power supply under overheated state. The utility model discloses change the second fuse hookup location strong current circuit among the prior art into weak current circuit, the electric current of the second fuse of flowing through reduces, so can adopt the low current fuse, has reduced the spontaneous heating problem of fuse, the cost is reduced, the reliability of second fuse work has been improved.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a kitchen household electrical appliances field especially relates to electric heating appliance's heating control circuit and electric heating appliance.
[ background of the invention ]
Electric heating appliances such as electric cookers, electric pressure cookers and the like belong to high-power type electric appliances, and in order to ensure normal and safe use of the electric appliances, the national new standard clearly defines that the high-power type electric appliances are required to be provided with fuses to prevent the electric appliances from being overheated to cause fire and endanger personal safety. The fuse is an overheating protection element, is usually connected in series to the power input end of various electrical appliances and is used for overheating protection, and when abnormal high temperature occurs in the use of the electrical appliances or the temperature rise is too high due to temperature control failure, the thermal fuse can rapidly cut off the circuit.
Based on the above overheating protection measures, in the electric heating appliance needing the double fuses to implement overheating protection, the fuses are respectively arranged on the zero line and the live line of the heating load loop, and when the appliance is abnormally burnt to cause the temperature to rise to the fusing temperature of the fuses, the fuses are disconnected to cut off the heating load loop, so that abnormal heating protection is realized, and the use safety of the appliance is ensured. The heating load is usually a high-power load, which causes the current in the heating load loop to be higher, and because the two fuses and the heating load are connected in series in the loop, the requirement on the current resistance of the fuses and the corresponding connecting wires thereof is higher, and the circuit cost is increased.
[ Utility model ] content
An object of the utility model is to provide an electric heating appliance's heating control circuit can solve above-mentioned technical problem partially at least.
In order to solve the technical problem, the utility model adopts the following technical scheme:
heating control circuit of electric heating appliance, connect mains supply's heating load circuit, control including both ends the control circuit and the connection of heating load circuit break-make mains supply does control circuit provides the power supply circuit of weak current voltage, heating load circuit includes heating load and establishes ties heating load one side is used for providing the first fuse of overheat protection, control circuit is including connecting the switching element and the control of heating load opposite side the MCU of switching element action, power supply circuit with it has the second fuse to establish ties between the control circuit for cut off under the overheated state switching element power supply.
In the heating control circuit of the electric heating appliance, the power supply circuit comprises a power supply end VCC and a grounding end, the MCU and the switch element are connected on one side of the power supply end VCC, the grounding end is connected on the other side of the switch element, and the second fuse is connected in series between the switch element and the power supply end VCC.
In the heating control circuit of the electric heating appliance, the control circuit comprises a power supply main circuit, a first power supply branch circuit and a second power supply branch circuit, the MCU passes through the first power supply branch circuit and the power supply main circuit is connected with the power supply end VCC, the switch element passes through the second power supply branch circuit and the power supply main circuit is connected with the power supply end VCC, and the second fuse is connected in the power supply main circuit or the second power supply branch circuit.
In the heating control circuit of the electric heating appliance, the power supply circuit comprises a power supply end VCC and a grounding end, the MCU and the switch element are connected at one side of the power supply end VCC and at the other side of the switch element VCC, and the second fuse is connected in series between the switch element and the grounding end.
In the heating control circuit of the electric heating appliance, the control circuit includes a ground main circuit, a first ground branch circuit and a second ground branch circuit, the MCU is connected to the ground terminal through the first ground branch circuit and the ground main circuit, the switch element is connected to the ground terminal through the second ground branch circuit and the ground main circuit, and the second fuse is connected to the ground main circuit or the second ground branch circuit.
In the heating control circuit of the electric heating appliance, the first fuse is connected between a live wire end of a mains supply and the heating load, and the switch element is connected between a zero wire end of the mains supply and the heating load.
In the heating control circuit of the electric heating appliance, the first fuse is connected between the zero line end of the mains supply and the heating load, and the switch element is connected between the live wire end of the mains supply and the heating load.
In the heating control circuit of the electric heating appliance, the switch element is a movable relay which is kept in an off state in a power-off state.
In the heating control circuit of the electric heating appliance, the heating load is a heating disc, an electromagnetic wire coil or a steam generator.
The utility model also provides an electric heating appliance, including any one of the above-mentioned technical scheme heating control circuit.
The utility model has the advantages that:
the utility model provides an electric heating appliance's heating control circuit, connect mains supply's heating load circuit, control including both ends the control circuit and the connection of heating load circuit break-make the mains supply does control circuit provides the power supply circuit of weak current voltage, heating load circuit includes heating load and establishes ties heating load one side is used for providing overheat protection's first fuse, control circuit is including connecting the switching element and the control of heating load opposite side the MCU of switching element action, power supply circuit with it has the second fuse to establish ties between the control circuit for cut off under the overheated state switching element power supply.
In the above-mentioned heating control circuit, the first fuse and the second fuse respectively provide overheat protection in the power supply lines on both sides of the heating load, the electric heating device is abnormally operated to cause temperature rise, when any one of the first fuse and the second fuse reaches its corresponding fusing temperature, the first fuse and the second fuse can be disconnected to cut off the corresponding power supply line to realize overheat protection, but different from the prior art, the second fuse of the present invention is connected in series between the power circuit and the control circuit, because the power circuit provides weak voltage for the control circuit, the control circuit operates under weak current, the current flowing through the second fuse and the corresponding connecting wire is smaller, under the premise of ensuring the above-mentioned overheat protection, the requirement for the current resistance of the second fuse and the corresponding connecting wire is reduced, the low current fuse and the low current wire can be adopted to reduce the circuit cost, and the installation of the second fuse is more convenient.
Moreover, the utility model provides a control circuit is including the MCU of connecting at the switching element of heating load opposite side and control switch element action, because power supply circuit provides weak current voltage for control circuit, in case the second fuse fuses, cuts off control circuit's power supply, and switching element loses the electricity and just can break off to cut off the power supply line of heating load opposite side, realize overheat protection's quick response, the security is better.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention will be further explained with reference to the drawings:
fig. 1 is a circuit diagram of a heating control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a heating control circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a heating control circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a heating control circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a heating control circuit according to an embodiment of the present invention.
Reference numerals:
100 a first fuse;
200 a second fuse;
300 heating load;
400 switching elements, 410 switching units, 420 driving units;
500 power supply main circuit, 510 first power supply branch circuit and 520 second power supply branch circuit;
600 ground main, 610 first ground branch, 620 second ground branch.
[ detailed description ] embodiments
The utility model provides an electric heating appliance's heating control circuit, connect mains supply's heating load circuit, control including both ends the control circuit and the connection of heating load circuit break-make the mains supply does control circuit provides the power supply circuit of weak current voltage, heating load circuit includes heating load and establishes ties heating load one side is used for providing overheat protection's first fuse, control circuit is including connecting the switching element and the control of heating load opposite side the MCU of switching element action, power supply circuit with it has the second fuse to establish ties between the control circuit for cut off under the overheated state switching element power supply. The heating control circuit changes the connection position of the second fuse from a strong current circuit to a weak current circuit in the prior art, and the current flowing through the second fuse is reduced, so that a low-current fuse can be adopted, the self-heating problem of the fuse is reduced, the cost is reduced, and the working reliability of the second fuse is improved.
The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, a heating control circuit of an electric heating appliance provided in an embodiment of the present invention includes a heating load circuit connected to a mains power supply at two ends, a control circuit for controlling on/off of the heating load circuit, and a power circuit connected to the mains power supply for providing a weak voltage to the control circuit, wherein the heating load circuit includes a heating load 300 and a first fuse 100, the control circuit includes a switch element 400 and an MCU for controlling the switch element 400, the first fuse 100 is connected between a live line terminal L of the mains power supply and the heating load 300, and provides overheat protection on a power supply line between the live line terminal L and the heating load 300; the switching element 400 is connected between the neutral line terminal N of the utility power supply and the heating load 300, and controls the on/off of the power supply line between the neutral line terminal N and the heating load 300.
As described above, the second fuse 200 is further connected in series between the power circuit and the control circuit, and is used for cutting off the power supply of the switching element 400 in an overheat state, and the switching element 400 is disconnected when power is lost, so that the power supply line on the other side of the heating load 300 is cut off, the quick response of overheat protection is realized, and the safety is better.
The following are exemplary: the power supply circuit includes power end VCC and ground terminal, and MCU and switching element 400 connect in parallel in control circuit, and power end VCC is connected to MCU and switching element 400 one side, and the ground terminal is connected to the opposite side, more specifically says: the control circuit further comprises a power supply main 500, a first power supply branch 510 and a second power supply branch 520, the MCU is connected to a power supply terminal VCC through the first power supply branch 510 and the power supply main 500, the switching element 400 is connected to the power supply terminal VCC through the second power supply branch 520 and the power supply main 500, and the second fuse 200 is connected to the power supply main 500. Once the second fuse 200 is blown, the power supply of the control circuit is cut off, both the MCU and the switching element 400 lose power, and the switching element 400 loses power and is turned off, thereby cutting off the power supply line between the neutral terminal N and the heating load 300, and implementing overheat protection.
Preferably, the method comprises the following steps: the switching element 400 is a movable relay which is kept in an off state in the off state, and more specifically, the relay is a device for controlling high voltage and large current by low voltage and small current, the movable relay includes a switching part 410 and a driving part 420, the switching part 410 is connected to a power supply line between a neutral terminal N and a heating load 300, and has two states of on and off, a coil is built in the driving part 420, and is powered by a power supply terminal VCC and controlled by an MCU, and the movable relay is in the off state, the switching unit 410 is always kept in the off state, and when the driving unit 420 is energized, the switching unit 410 is driven to switch to the on state, the power supply line between the neutral terminal N and the heating load 300 is turned on, and once the second fuse 200 is fused, the power supply of the driving unit 420 is cut off, and the switching unit 410 is switched to the off state, the power supply line between the neutral terminal N and the heating load 300 is cut off, thereby performing overheat protection.
According to the heating control circuit of this embodiment, because the second fuse 200 is connected in series between the power supply circuit and the control circuit, and the power supply circuit provides weak current voltage for the control circuit, the control circuit works under weak current, the current flowing through the second fuse 200 and the corresponding connecting wire is smaller, under the premise of ensuring the aforesaid overheat protection, the requirement for the current resistance of the second fuse 200 and the corresponding connecting wire is reduced, a low-current fuse and a low-current wire can be adopted, the circuit cost is reduced, and the installation of the second fuse 200 is more convenient.
The heating load 300 described in this embodiment includes but is not limited to a heating plate, an electromagnetic wire coil and a steam generator, and the heating plate is taken as an example, and is usually an aluminum alloy disc with an embedded heating tube, and two ends of the heating tube are electrically connected to the above-mentioned heating load 300 circuit, and during normal operation, the heating tube is electrified to generate heat, and the heat is transferred to containers such as an inner container through the aluminum alloy disc, so as to heat food. Other heating loads, such as electromagnetic coils and steam generators, can be referred to the structures disclosed in the prior art, and the description of the embodiment is omitted.
In summary, the heating control circuit of this embodiment changes the connection position of the second fuse 200 from a strong current circuit to a weak current circuit in the prior art, and reduces the current flowing through the second fuse 200, so that a low-current fuse can be used, thereby reducing the self-heating problem of the fuse, reducing the cost, and improving the reliability of the operation of the second fuse 200.
Referring to fig. 2, in an embodiment of the present invention, the heating control circuit according to the above embodiment: the second fuse 200 is connected in the second power supply branch 520, once the second fuse 200 is fused, the power supply of the control circuit is cut off, and the switching element 400 is disconnected in a power loss manner, so as to cut off the power supply line between the zero line terminal N and the heating load 300, and implement the overheating protection, in the embodiment, when the second fuse 200 implements the overheating protection, only the switching element 400 is disconnected in a power loss manner, the first power supply branch 510 and the power supply main circuit 500 are still conducted, and the MCU can continue to operate, so as to control other devices, such as a motor, a fan, an indicator light, and the like, when the overheating protection occurs.
Referring to fig. 3, in an embodiment of the present invention, the heating control circuit according to the above embodiment: the control circuit further includes a ground main circuit 600, a first ground branch 610 and a second ground branch 620, the MCU is connected to the ground terminal through the first ground branch 610 and the ground main circuit 600, the switching element 400 is connected to the ground terminal through the second ground branch 620 and the ground main circuit 600, and the second fuse 200 is connected to the ground main circuit 600. As can be seen from the figure, the current is input from the power supply terminal VCC, and reaches the ground terminal after passing through the control circuit to form a loop, once the second fuse 200 is fused, the ground main circuit 600 is cut off, the whole loop is disconnected, the MCU and the switching element 400 lose power, and the switching element 400 loses power and is disconnected, so that the power supply line between the zero line terminal N and the heating load 300 is cut off, and the overheat protection is implemented.
Referring to fig. 4, according to the principle of the scheme described in this embodiment, the second fuse 200 may also be connected to the second grounding branch 620, once the second fuse 200 is blown, only the second grounding branch 620 is disconnected, the first grounding branch 610 and the grounding main circuit 600 are still connected, a loop is still formed from the power supply terminal VCC to the grounding terminal via the MCU, the first grounding branch 610 and the grounding main circuit 600, and the MCU may continue to operate to control other devices, such as a motor, a fan, an indicator light, and the like, when the overheat protection occurs.
Referring to fig. 5, a heating control circuit of an electric heating appliance according to an embodiment of the present invention includes a heating load 300 circuit connected to a mains power supply at two ends, a control circuit for controlling on/off of the heating load 300 circuit, and a power supply circuit connected to the mains power supply for providing a weak voltage to the control circuit, wherein the heating load 300 circuit includes a heating load 300 and a first fuse 100, the control circuit includes a switch element 400 and an MCU for controlling the switch element 400 to operate, the first fuse 100 is connected between a neutral terminal N of the mains power supply and the heating load 300, and an overheat protection circuit is provided on a power supply line between the neutral terminal N and the heating load 300; the switching element 400 is connected between a live line end L of a mains supply and the heating load 300, controls the on-off of a power supply line between the live line end L and the heating load 300, and is also connected in series with the second fuse 200 between the power circuit and the control circuit. The present embodiment is different from the previous embodiment in that: the first fuse 100 provides overheat protection for the power supply line between the neutral terminal N and the heating load 300, and the second fuse 200 provides overheat protection for the power supply line between the live terminal L and the heating load 300, and the specific circuit configuration may refer to any of the foregoing embodiments.
An embodiment of the utility model provides an electric heating appliance uses aforementioned arbitrary embodiment heating control circuit to electric rice cooker is the example, including a kind of deep pot body and a kind of deep pot lid, the internal container has been held in a kind of deep pot body, and the internal container below sets up heating load, and heating load can be heating plate or electromagnetic wire coil, and the internal container temperature is directly or indirectly known to first fuse and second fuse, and breaks off rapidly when the heating is unusual, realizes dual overheat protection.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. Heating control circuit of electric heater utensil, including the heating load circuit, the control that mains power supply is connected at both ends the control circuit of heating load circuit break-make and connection mains power supply does control circuit provides the power supply circuit of weak current voltage, heating load circuit includes heating load and establishes ties heating load one side is used for providing the first fuse of overheat protection, control circuit is including connecting the switching element and the control of heating load opposite side the MCU of switching element action, its characterized in that, power supply circuit with it has the second fuse to establish ties between the control circuit for cut off under overheated state the switching element power supply.
2. The heating control circuit of an electric heating appliance according to claim 1, wherein said power supply circuit comprises a power supply terminal VCC and a ground terminal, said MCU and said switching element are connected to said power supply terminal VCC on one side and to said ground terminal on the other side, and said second fuse is connected in series between said switching element and said power supply terminal VCC.
3. The heating control circuit of an electric heating appliance according to claim 2, wherein said control circuit comprises a power supply main, a first power supply branch and a second power supply branch, said MCU is connected to said power terminal VCC through said first power supply branch and said power supply main, said switching element is connected to said power terminal VCC through said second power supply branch and said power supply main, and said second fuse is connected in said power supply main or said second power supply branch.
4. The heating control circuit of an electric heating appliance according to claim 1, wherein said power supply circuit comprises a power terminal VCC and a ground terminal, said MCU and said switching element are connected to said power terminal VCC on one side and to said ground terminal on the other side, and said second fuse is connected in series between said switching element and said ground terminal.
5. The heating control circuit of an electric heating appliance according to claim 4, wherein the control circuit comprises a ground main circuit, a first ground branch circuit and a second ground branch circuit, the MCU is connected to the ground terminal through the first ground branch circuit and the ground main circuit, the switch element is connected to the ground terminal through the second ground branch circuit and the ground main circuit, and the second fuse is connected to the ground main circuit or the second ground branch circuit.
6. A heating control circuit of an electric heating appliance as claimed in any one of claims 1 to 5, wherein said first fuse is connected between a live terminal of a commercial power supply and said heating load, and said switching element is connected between a neutral terminal of the commercial power supply and said heating load.
7. A heating control circuit of an electric heating appliance as claimed in any one of claims 1 to 5, wherein said first fuse is connected between a neutral terminal of a commercial power supply and said heating load, and said switching element is connected between a live terminal of the commercial power supply and said heating load.
8. A heating control circuit of an electric heating appliance as claimed in any one of claims 1 to 5, wherein said switching element is a movable type relay which is kept in an off state.
9. The heating control circuit of the electric heating appliance according to one of claims 1 to 5, wherein the heating load is a heat generating plate, an electromagnetic wire coil or a steam generator.
10. Electric heating appliance, characterized in that it comprises a heating control circuit according to one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022633936.1U CN214128209U (en) | 2020-11-13 | 2020-11-13 | Heating control circuit of electric heating appliance and electric heating appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022633936.1U CN214128209U (en) | 2020-11-13 | 2020-11-13 | Heating control circuit of electric heating appliance and electric heating appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214128209U true CN214128209U (en) | 2021-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022633936.1U Active CN214128209U (en) | 2020-11-13 | 2020-11-13 | Heating control circuit of electric heating appliance and electric heating appliance |
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| Country | Link |
|---|---|
| CN (1) | CN214128209U (en) |
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- 2020-11-13 CN CN202022633936.1U patent/CN214128209U/en active Active
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Effective date of registration: 20230816 Address after: Building 2, No. 52, 22nd Street, Baiyang Street, Qiantang New District, Hangzhou City, Zhejiang Province, 310000 Patentee after: Hangzhou Jiuchuang Home Appliances Co.,Ltd. Address before: 310018 No. 760 Yinhai Street, Xiasha Street, Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: HANGZHOU JIUYANG HOUSEHOLD ELECTRICAL APPLIANCES CO.,LTD. |