CN216122933U - Heating system comprising multi-section electromagnetic heating unit and electromagnetic heating equipment - Google Patents
Heating system comprising multi-section electromagnetic heating unit and electromagnetic heating equipment Download PDFInfo
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- CN216122933U CN216122933U CN202122547540.XU CN202122547540U CN216122933U CN 216122933 U CN216122933 U CN 216122933U CN 202122547540 U CN202122547540 U CN 202122547540U CN 216122933 U CN216122933 U CN 216122933U
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Abstract
The utility model discloses a heating system comprising a plurality of sections of electromagnetic heating units and electromagnetic heating equipment, wherein the heating system comprises a first heating unit and a second heating unit, the first heating unit comprises a first heating element, a first capacitor and a first power switch, and the first heating element is connected with the first capacitor in parallel and then connected with the first power switch in series; the second heating unit is connected with the first heating unit in parallel, the second heating unit comprises a second capacitor, a second power switch, a control switch and at least two second heating elements connected in parallel, the control switch is connected with the at least two second heating elements connected in parallel in series to form a heating circuit, and the heating circuit is connected with the second capacitor in parallel and then connected with the second power switch in series. Therefore, the reliability and the safety of the product can be guaranteed, and the user experience is improved.
Description
Technical Field
The utility model relates to the technical field of electrical equipment, in particular to a heating system comprising a plurality of sections of electromagnetic heating units and electromagnetic heating equipment.
Background
An IH electric cooker is an appliance which utilizes electromagnetic induction to make an inner container generate heat by itself to heat food and has the advantages of fast heating, large firepower, more electricity saving and good heat convection. In recent years, multi-segment IH rice cookers have come into the market, and have the advantages of good cooking uniformity, good heat preservation performance and the like. Since the plurality of stages IH include a plurality of heating coils. The coils are controlled by switching the switches, and if a circuit of a certain switching device has a problem, the expected cooking effect can not be achieved, and even safety accidents occur. Particularly when the switch employs a relay, its electrical life is limited and there is a risk of transient failure.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present invention provide a heating system and an electromagnetic heating apparatus including a multi-stage electromagnetic heating unit, so as to solve the problem that the switching circuit of the existing multi-stage IH product control switch fails and cannot be detected.
According to a first aspect, embodiments of the present invention provide a heating system comprising a multi-stage electromagnetic heating unit, comprising a first heating unit and a second heating unit; the first heating unit comprises a first heating element, a first capacitor and a first power switch, wherein the first heating element is connected with the first capacitor in parallel and then connected with the first power switch in series; the second heating unit is connected with the first heating unit in parallel, the second heating unit comprises a second capacitor, a second power switch, a control switch and at least two second heating elements connected in parallel, the control switch is connected with the at least two second heating elements connected in parallel in series to form a heating circuit, and the heating circuit is connected with the second capacitor in parallel and then connected with the second power switch in series.
With reference to the first aspect, in a first embodiment of the first aspect, the second heating unit comprises two second heating elements connected in parallel.
With reference to the first embodiment of the first aspect, in a second embodiment of the first aspect, the control switch is a single-pole double-throw switch.
With reference to the first aspect, in a third implementation manner of the first aspect, the heating system further includes a power supply unit configured to supply power to the first heating unit and the second heating unit.
With reference to the third embodiment of the first aspect, in the fourth embodiment of the first aspect, the power supply unit includes a first filter circuit, a rectifier circuit connected to the first filter circuit, and a second filter circuit connected to the rectifier circuit, and the second filter circuit is connected to the first heating unit and the second heating unit; the first filter circuit is used for filtering the interference of a power grid and the interference of the power grid to electromagnetic heating; the rectifying circuit is used for realizing the change from alternating current to direct current; the second filter circuit is used for converting pulsating direct current into smooth direct current.
With reference to the fourth implementation manner of the first aspect, in the fifth implementation manner of the first aspect, the first filter circuit is an EMC filter circuit; and/or the rectifying circuit is a bridge rectifying circuit.
With reference to the first aspect, in a sixth implementation manner of the first aspect, the first power switch and the second power switch are both insulated gate bipolar transistors.
With reference to the first aspect, in a seventh implementation manner of the first aspect, the first capacitor and the second capacitor are both resonant capacitors.
According to a second aspect, embodiments of the present invention further provide an electromagnetic heating apparatus, including the heating system according to the first aspect or any embodiment of the first aspect.
With reference to the second aspect, in a first embodiment of the second aspect, the electromagnetic heating apparatus includes an electric rice cooker, an induction cooker and an electric pressure cooker.
In the heating system and the electromagnetic heating device provided by the embodiment of the utility model, which comprise a plurality of sections of electromagnetic heating units, only one heating element in at least two second heating elements in the second heating units can be connected into a circuit at the same time; each second heating element in the second heating unit can be coupled with the first heating element in the first heating unit, but the coupling results of each second heating element and the first heating element are different, specifically, after each second heating element is coupled with the first heating element, the frequency of the first power switch is different, and the frequency of the first power switch during the coupling of each second heating element and the first heating element can be recorded. Therefore, whether the control switch, the first heating unit or the second heating unit fails or not can be judged according to the frequency of the first power switch, and the problem that the existing multi-section IH product control switch switching circuit fails and cannot be detected is solved.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the utility model in any way, and in which:
fig. 1 is a schematic configuration diagram of a specific example of a heating system including a multi-stage electromagnetic heating unit;
FIG. 2 is a schematic configuration diagram of another specific example of a heating system including a multi-stage electromagnetic heating unit;
FIG. 3 is a schematic structural view showing still another specific example of a heating system including a multi-stage electromagnetic heating unit;
fig. 4 is a schematic flowchart of a failure detection method for a heating system including a multi-stage electromagnetic heating unit according to embodiment 2 of the present invention;
FIG. 5 is a schematic flow diagram of a specific example of a failure detection method for a heating system including a multi-stage electromagnetic heating unit;
fig. 6 is a schematic structural diagram of a failure detection apparatus including a heating system of a multi-stage electromagnetic heating unit in embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Example 1
Embodiment 1 of the present invention provides a heating system including a multi-stage electromagnetic heating unit, including a first heating unit and a second heating unit. The first heating unit comprises a first heating element, a first capacitor and a first power switch, wherein the first heating element is connected with the first capacitor in parallel and then connected with the first power switch in series; the second heating unit is connected with the first heating unit in parallel, the second heating unit comprises a second capacitor, a second power switch, a control switch and at least two second heating elements connected in parallel, the control switch is connected with the at least two second heating elements connected in parallel in series to form a heating circuit, and the heating circuit is connected with the second capacitor in parallel and then connected with the second power switch in series.
Specifically, the second heating unit comprises two second heating elements connected in parallel. The control switch is a single-pole double-throw switch. The first heating element and the second heating element may be heating coils, and the first capacitance and the second capacitance may be resonant capacitances.
Specifically, the first heating element and the second heating element are in the form of wire coils, for example, enameled wires are wound on a structural member at the bottom of the pot, and then magnetic strips are added to restrain magnetic lines of force.
Specifically, the heating system further comprises a power supply unit, and the power supply unit is used for supplying power to the first heating unit and the second heating unit.
An exemplary heating system including a multi-stage electromagnetic heating unit includes a power supply unit, a first heating unit, and a second heating unit, the first heating unit. The first heating unit comprises a first heating element, a first capacitor and a first power switch; the first end of the first heating element is connected with the first end of the power supply unit, and the second end of the first heating element is connected with the first end of the first power switch; the first capacitor is connected in parallel with the first heating element, and the second end of the first power switch is connected with the second end of the power supply unit. The second heating unit comprises a control switch, a second capacitor, a second power switch and at least two second heating elements; the at least two second heating elements are connected in parallel, wherein a first end of one second heating element is connected with the power supply unit through the control switch, and a second end of the second heating element is connected with a first end of the second power switch; the second capacitor is connected in parallel with the at least two second heating elements, and a second end of the second power switch is connected with a second end of the power supply unit.
Specifically, the power supply unit comprises a first filter circuit, a rectifier circuit connected with the first filter circuit, and a second filter circuit connected with the rectifier circuit, wherein the second filter circuit is connected with the first heating unit and the second heating unit; the first filter circuit is used for filtering the interference of a power grid and the interference of the power grid to electromagnetic heating; the rectifying circuit is used for realizing the change from alternating current to direct current; the second filter circuit is used for converting pulsating direct current into smooth direct current.
That is, fig. 1 shows an IH rice cooker heated by 3 heating elements, and K2 shows a control switch for controlling the heating element 2(L2) or the heating element 3(L3) to be connected to the heating circuit. The IGBT is a power switch, the IGBT1 is used for controlling the heating element 1(L1) and the resonant capacitor 1(C1) to perform resonant heating, and the IGBT2 is used for controlling the heating element 2(L2) or the heating element 3(L3) and the resonant capacitor 2(C2) to perform resonant heating. The filter circuit converts the rectified pulsating direct current into smooth direct current; the bridge rectification realizes the change of AC-DC; the EMC filter circuit filters interference on a power grid and interference of the power grid on IH heating; f1 is a protective tube, R1 and a piezoresistor; l and N are respectively the connecting terminals of the live wire and the zero line.
It should be noted that in embodiment 1 of the present invention, the first heating unit and the second heating unit may be combined in different ways in the heating system including the multi-stage electromagnetic heating units, for example, one first heating unit and one second heating unit as shown in fig. 1, two first heating units and one second heating unit as shown in fig. 2, where the IGBTs 1, L1, and C1 constitute one of the first heating units, the IGBTs 3, L4, and C3 constitute another first heating unit, and the IGBTs 2, L2, L3, C2, and K2 constitute the second heating unit. One first heating unit and two second heating units shown in fig. 3, wherein the IGBTs 1, L1, C1 constitute the first heating unit, the IGBTs 2, L2, L3, C2, and K2 constitute one second heating unit, and the IGBTs 3, L4, L5, C3, and K3 constitute another second heating unit. Of course, the number of the first heating unit and the second heating unit may be other than one or two.
In the heating system including the multi-stage electromagnetic heating unit provided in embodiment 1 of the present invention, only one of the at least two second heating elements in the second heating unit can be connected to the circuit at the same time; each second heating element in the second heating unit can be coupled with the first heating element in the first heating unit, but the coupling results of each second heating element and the first heating element are different, specifically, after each second heating element is coupled with the first heating element, the frequency of the first power switch is different, and the frequency of the first power switch during the coupling of each second heating element and the first heating element can be recorded. Therefore, whether the control switch, the first heating unit or the second heating unit fails can be judged according to the frequency of the first power switch.
Example 2
On the basis of embodiment 1 of the present invention, embodiment 2 of the present invention provides a failure detection method for a heating system including a multi-stage electromagnetic heating unit. Fig. 4 is a schematic flowchart of a failure detection method for a heating system including a multi-stage electromagnetic heating unit in embodiment 2 of the present invention. As shown in fig. 4, the failure detection method of the heating system including the multi-stage electromagnetic heating unit includes the steps of:
s101: the frequency of the first power switch is obtained after any one of the second heating elements in the second heating unit is switched into the circuit.
S102: and judging whether the frequency of the first power switch conforms to a preset power range, wherein the power range is determined according to the coupling result of the first heating element and a second heating element connected into the circuit.
S103: and when the frequency of the first power switch does not meet the power range, judging that a second heating element connected into the circuit fails to heat.
Further, after determining that the one second heating element fails to heat, the method further includes: and sending an alarm prompt message.
For example, for the heating system in fig. 1, it is assumed that, under the condition that the heating element 1(L1) operates at the power W1, when the heating element 2(L2) is connected in the circuit, the switching frequency of the IGBT1 corresponding to the heating element 1(L1) changes from F1 to F4 due to the coupling effect of the heating element 1(L1) and the heating element 2 (L2); when the heating element 3(L3) is switched into the circuit, the switching frequency of the IGBT1 corresponding to the heating element 1(L1) changes from F1 to F5 due to the coupling effect of the heating element 1(L1) and the heating element 3 (L3).
Therefore, when the heating element 2(L2) is controlled to be connected into the circuit and the heating element 1(L1) heats according to the power W1, if the switching frequency of the IGBT1 is not equal to F4 at the moment, the corresponding heating element can be judged not to be connected into the circuit, namely, the single-pole double-throw relay fails or the control circuit thereof fails to work, so that the single-pole double-throw relay cannot work. Or, when the heating element 3(L3) is controlled to be connected into the circuit and the heating element 1(L1) heats according to the power W1, and the switching frequency of the IGBT1 is not equal to F5, it can be determined that the corresponding heating element is not connected into the circuit, that is, the single-pole double-throw relay fails or the control circuit fails, so that the corresponding heating element cannot operate.
This is because the heating element 1(L1) is laid out at the bottom of the pot, the heating element 2(L2) at the R-corner of the pot, and the heating element 3(L3) at the top side of the pot. The heating power corresponding to the heating element 1(L1) is W1, and the switching frequency of the IGBT1 is F1; the heating power corresponding to the heating element 2(L2) is W2, and the switching frequency of the IGBT2 is F2; the heating power corresponding to the heating element 3(L3) is W3, and the switching frequency of the IGBT2 is F3. When the heating system is determined, the rated power of the whole machine is determined, the heating power W1, W2, W3 of each heating element is determined, and F1, F2 and F3 are also determined.
The switch K2 is a single-pole double-throw relay, and is connected to the heating element 2(L2) at a normally closed end and the heating element 3(L3) at a normally open end.
The coupling between heating element 1(L1) and heating element 2(L2) is greater than the coupling between heating element 1(L1) and heating element 3(L3), and only one heating element can be switched into the circuit at the same time for heating element 2(L2) and heating element 3 (L3). When one heating element heats due to different couplings, if the other heating elements are not connected into the circuit according to the control target, the switching frequencies of the IGBTs heated by the corresponding heating elements are different. Based on which it can be judged that the switching device or its control circuit is malfunctioning.
Since each product will vary. The heating element quantity of the heating element has deviation, the resonance capacitance has deviation, and the distance between the heating element and the cooker, the cooker material and the like can influence the IGBT switching frequency. However, the heating power of each heating element of each product is determined, the heating power is calibrated to be within a rated power range before leaving a factory, and when the power is determined, the switching frequency of the IGBT corresponding to the heating element is determined. At this time, the control chip may memorize the IGBT switching frequency corresponding to each heating element at this time as the initial frequency F1.
In the failure detection method including the multi-stage electromagnetic heating unit heating system according to embodiment 2 of the present invention, after any one of the second heating elements in the second heating unit is connected to the circuit, the frequency of the first power switch is obtained; judging whether the frequency of the first power switch meets a preset power range, wherein the power range is determined according to a coupling result of the first heating element and a second heating element connected into the circuit; and when the frequency of the first power switch does not meet the power range, judging that a second heating element connected into the circuit fails to heat. Therefore, whether the control switch, the first heating unit or the second heating unit fails or not is judged according to the frequency of the first power switch, so that the reliability and the safety of the product are guaranteed, and the user experience is improved.
Example 3
Corresponding to embodiment 2 of the present invention, embodiment 3 of the present invention provides a failure detection apparatus including a multi-stage electromagnetic heating unit heating system. Fig. 6 is a schematic structural diagram of a failure detection apparatus including a heating system of a multi-stage electromagnetic heating unit in embodiment 3 of the present invention. As shown in fig. 6, the failure detection apparatus including the multi-stage electromagnetic heating unit heating system includes an acquisition module 20, a judgment module 21, and a processing module 22.
Specifically, after any one of the second heating elements in the second heating unit is connected to the circuit, the obtaining module 20 is configured to obtain the frequency of the first power switch;
a determining module 21, configured to determine whether a frequency of the first power switch meets a preset power range, where the power range is determined according to a coupling result between the first heating element and a second heating element connected to the circuit;
and the processing module 22 is used for judging that the second heating element fails to heat when the frequency of the first power switch does not meet the power range.
The specific details of the failure detection device including the multi-stage electromagnetic heating unit heating system may be understood by referring to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to 5, which are not described herein again.
Example 4
The embodiment of the utility model also provides electromagnetic heating equipment which comprises the heating system and the controller in the first aspect, wherein the controller is in communication connection with the first power switch and the second power switch; the controller includes a processor and a memory.
Specifically, the controller outputs a control signal, which drives and amplifies the first power switch and the second power switch via the driving circuit.
The processor may be a Central Processing Unit (CPU). The Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as program instructions/modules (for example, the obtaining module 20, the determining module 21, and the processing module 22 shown in fig. 6) corresponding to the failure detection method of the heating system including multiple sections of electromagnetic heating units in the embodiment of the present invention, the processor executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions, and modules stored in the memory, so as to implement the failure detection method of the heating system including multiple sections of electromagnetic heating units in the above-described method embodiment.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be coupled to the processor via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and, when executed by the processor, perform a failure detection method comprising a multi-segment electromagnetic heating unit heating system as in the embodiments of fig. 1-5.
The details of the electromagnetic heating device can be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to 5, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A heating system comprising a multi-stage electromagnetic heating unit, comprising:
the heating device comprises a first heating unit, a second heating unit and a control unit, wherein the first heating unit comprises a first heating element, a first capacitor and a first power switch, and the first heating element is connected with the first capacitor in parallel and then connected with the first power switch in series;
the second heating unit is connected with the first heating unit in parallel, the second heating unit comprises a second capacitor, a second power switch, a control switch and at least two second heating elements connected in parallel, the control switch is connected with the at least two second heating elements connected in parallel in series to form a heating circuit, and the heating circuit is connected with the second capacitor in parallel and then connected with the second power switch in series.
2. The heating system of claim 1, wherein the second heating unit comprises two second heating elements connected in parallel.
3. The heating system of claim 2, wherein the control switch is a single pole double throw switch.
4. The heating system of claim 1, further comprising a power supply unit for supplying power to the first heating unit and the second heating unit.
5. The heating system according to claim 4, wherein the power supply unit includes a first filter circuit, a rectifier circuit connected to the first filter circuit, a second filter circuit connected to the rectifier circuit, the second filter circuit being connected to the first heating unit and the second heating unit;
the first filter circuit is used for filtering the interference of a power grid and the interference of the power grid to electromagnetic heating;
the rectifying circuit is used for realizing the change from alternating current to direct current;
the second filter circuit is used for converting pulsating direct current into smooth direct current.
6. The heating system of claim 5, wherein the first filter circuit is an EMC filter circuit; and/or the rectifying circuit is a bridge rectifying circuit.
7. The heating system of claim 1, wherein the first power switch and the second power switch are both insulated gate bipolar transistors.
8. The heating system of claim 1, wherein the first and second capacitors are both resonant capacitors.
9. An electromagnetic heating apparatus, comprising: a heating system as claimed in any one of claims 1 to 8.
10. The electromagnetic heating apparatus according to claim 9, wherein the electromagnetic heating apparatus comprises an electric cooker, an induction cooker and an electric pressure cooker.
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| CN202122547540.XU CN216122933U (en) | 2021-10-21 | 2021-10-21 | Heating system comprising multi-section electromagnetic heating unit and electromagnetic heating equipment |
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| CN202122547540.XU CN216122933U (en) | 2021-10-21 | 2021-10-21 | Heating system comprising multi-section electromagnetic heating unit and electromagnetic heating equipment |
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