CN111787654A - Heating circuit of electromagnetic cooking utensil and electromagnetic cooking utensil - Google Patents
Heating circuit of electromagnetic cooking utensil and electromagnetic cooking utensil Download PDFInfo
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- CN111787654A CN111787654A CN201910266629.3A CN201910266629A CN111787654A CN 111787654 A CN111787654 A CN 111787654A CN 201910266629 A CN201910266629 A CN 201910266629A CN 111787654 A CN111787654 A CN 111787654A
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- switch
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
- Electric Stoves And Ranges (AREA)
Abstract
The invention provides a heating circuit of an electromagnetic cooking appliance and the electromagnetic cooking appliance, and belongs to the field of electric appliances. The heating circuit of the electromagnetic cooking utensil comprises: at least two coil control circuits, the at least two coil control circuits being connected in series, a first coil control circuit of the at least two coil control circuits comprising at least two branches connected in parallel, each of the other coil control circuits of the at least two coil control circuits except the first coil control circuit comprising at least one branch, each of the branches comprising a coil, a capacitor and a switch connected in series; wherein, when the at least one branch is two or more branches, the two or more branches are connected in parallel. The invention realizes the performance improvement of the output power of the electromagnetic cooking appliance by combining a plurality of coils and series capacitors thereof through connecting the coil control circuits in series.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a heating circuit of an electromagnetic cooking appliance and the electromagnetic cooking appliance.
Background
The induction cooker mainly drives a coil to generate an alternating magnetic field through a high-power switching device (such as an Insulated Gate Bipolar Transistor (IGBT) and the like), so that a pot in the induction cooker is heated to achieve the purpose of heating.
In the related art, one or two switching devices are used in a heating circuit to control one coil for heating, but the control method does not maximize the utilization of hardware (e.g., resonant capacitor, coil, switching device, etc.) in the circuit.
Disclosure of Invention
The invention aims to provide a heating circuit of an electromagnetic cooking appliance and the electromagnetic cooking appliance, which are used for solving the problem of serially connecting coils with different paths.
In order to achieve the above object, the present invention provides a heating circuit of an electromagnetic cooking appliance, including: at least two coil control circuits, the at least two coil control circuits being connected in series, a first coil control circuit of the at least two coil control circuits comprising at least two branches connected in parallel, each of the other coil control circuits of the at least two coil control circuits except the first coil control circuit comprising at least one branch, each of the branches comprising a coil, a capacitor and a switch connected in series; wherein, when the at least one branch is two or more branches, the two or more branches are connected in parallel.
Preferably, the heating circuit of the electromagnetic cooking appliance further comprises: the coil control circuit comprises at least two short-circuit switch circuits which are connected in series, one short-circuit switch circuit corresponds to one coil control circuit and is connected with the coil control circuit in parallel, and each short-circuit switch circuit of the at least two short-circuit switch circuits comprises a capacitor and a switch which are connected in series.
Preferably, the at least two coil control circuits comprise: the first coil control circuit comprises a first branch circuit and a second branch circuit which are connected in parallel, the first branch circuit comprises a first coil, a first capacitor and a first switch which are connected in series, and the second branch circuit comprises a second coil, a second capacitor and a second switch which are connected in series; and the second coil control circuit comprises a third branch circuit and a fourth branch circuit which are connected in parallel, the third branch circuit comprises a third coil, a third capacitor and a third switch which are connected in series, and the fourth branch circuit comprises a fourth coil, a fourth capacitor and a fourth switch which are connected in series.
Preferably, the at least two short-circuit switch circuits include: a first short-circuit switch circuit connected in parallel with the first coil control circuit, the first short-circuit switch circuit including a fifth capacitor and a fifth switch connected in series; and a second short-circuit switch circuit connected in parallel with the second coil control circuit, the second short-circuit switch circuit including a sixth capacitor and a sixth switch connected in series.
Preferably, the first to sixth switches are connected to the same node.
Preferably, the heating circuit of the electromagnetic cooking appliance further comprises: a controller for effecting heating of the coil of at least one branch of the at least two coil control circuits by controlling the switch in each of the at least two coil control circuits and the switch in each of the at least two short circuit switch circuits.
Preferably, the controller is further configured to: under the condition that at least one switch in the at least two short-circuit switch circuits is controlled to be closed, the switches in the coil control circuits which are connected with the short-circuit switch circuit where the closed switch is located in parallel are controlled to be opened; and under the condition that at least one switch in the at least two short-circuit switch circuits is controlled to be opened, controlling at least one switch in a coil control circuit which is connected with the short-circuit switch circuit where the opened switch is located to be closed.
Preferably, the controller controls at least one switch in the at least two coil control circuits to close so that the coil on the branch on which the closed switch is located heats up.
Preferably, the heating circuit of the electromagnetic cooking appliance further comprises: a controller for effecting heating of at least one of the first, second, third and fourth coils by controlling the first, second, third, fourth, fifth and sixth switches.
Preferably, the controller controls the first switch and the second switch to be opened in a case where the fifth switch is controlled to be closed, and controls at least one of the first switch and the second switch to be closed in a case where the fifth switch is controlled to be opened; and the controller controls the third switch and the fourth switch to be opened under the condition that the sixth switch is controlled to be closed, and controls at least one of the third switch and the fourth switch to be closed under the condition that the sixth switch is controlled to be opened.
Accordingly, the present invention also provides an electromagnetic cooking appliance comprising the heating circuit of the above-described electromagnetic cooking appliance.
Through the technical scheme, the coil control circuit is connected in series to combine the plurality of coils and the series capacitors thereof, so that the performance improvement of the output power of the electromagnetic cooking appliance is realized.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a block diagram showing a heating circuit of an electromagnetic cooking device according to the present invention;
FIG. 2 is a diagrammatic view of a four coil combination provided by the present invention; and
fig. 3 is a circuit diagram of a heating circuit of the electromagnetic cooking appliance provided according to fig. 2.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram of a heating circuit of an electromagnetic cooking appliance according to the present invention, and as shown in fig. 1, the heating circuit of the electromagnetic cooking appliance includes: the coil control circuit comprises at least two coil control circuits which are connected in series, wherein a first coil control circuit in the at least two coil control circuits comprises at least two branches which are connected in parallel, each coil control circuit in the other coil control circuits except the first coil control circuit in the at least two coil control circuits comprises at least one branch, and each branch comprises a coil, a capacitor and a switch which are connected in series; when at least one branch is two or more branches, the two or more branches are connected in parallel.
Here, the "first" is merely an exemplary description made for convenience of description and does not limit the present invention, for example, the first coil control circuit is any one of at least two coil control circuits.
Specifically, at least one of the at least two coil control circuits includes at least two branches connected in parallel, and the other coil control circuit includes at least one branch, and in the case where two or more branches are included in the other coil control circuit, the two or more branches are connected in parallel.
For all the branches of the at least two coil control circuits including the coils, the capacitors and the switches connected in series, a specific description is given below, where a coil control circuit includes one branch, the branch includes the coils, the capacitors and the switches connected in series, and where a coil control circuit includes a plurality of branches connected in parallel, each branch includes the coils, the capacitors and the switches connected in series, that is, the coils, the capacitors and the switches are connected in series and then connected in parallel.
As shown in fig. 1, the heating circuit of the electromagnetic cooking apparatus according to the present invention further includes: the coil control circuit comprises at least two short-circuit switch circuits, wherein the at least two short-circuit switch circuits are connected in series, one short-circuit switch circuit corresponds to one coil control circuit and is connected with the coil control circuit in parallel, and each short-circuit switch circuit of the at least two short-circuit switch circuits comprises a capacitor and a switch which are connected in series.
Each coil control circuit is connected in parallel with a short-circuit switch circuit, that is, one coil control circuit is connected in parallel with one short-circuit switch circuit, it should be noted that one coil control circuit may include one or more branches formed by coils, capacitors and switches connected in series, and one coil control circuit is connected in parallel with one short-circuit switch circuit no matter how many branches formed by coils, capacitors and switches connected in series are included in the coil control circuit.
In addition, the heating circuit of the electromagnetic cooking appliance provided by the invention further comprises: a controller for effecting heating of the coil of at least one branch of the at least two coil control circuits by controlling the switch in each of the at least two coil control circuits and the switch in each of the at least two short circuit switch circuits. It will be readily appreciated that if a switch is closed, the coil in series with that closed switch heats up, and if the switch is open, the coil in series with that open switch does not heat up.
Specifically, the controller is further configured to: under the condition that at least one switch in at least two short-circuit switch circuits is controlled to be closed, the switches in the coil control circuits which are connected with the short-circuit switch circuit where the closed switch is located in parallel are controlled to be opened; and controlling at least one switch in the coil control circuit in parallel with the short-circuit switch circuit in which the open switch is located to be closed under the condition that at least one switch in the at least two short-circuit switch circuits is controlled to be open.
If all the switches in the parallel-connected short-circuit switch circuit and the coil control circuit are in the open state at the same time, then the whole circuit is in the open state, so all the switches in the parallel-connected short-circuit switch circuit and the coil control circuit cannot be in the open state at the same time, that is, in the case that the switch in the short-circuit switch circuit is closed, all the switches in the coil control circuit in parallel with the short-circuit switch circuit in which the closed switch is located should be in the open state. On the other hand, if one or more switches in the coil control circuit are closed and the switches in the short-circuit switch circuit connected in parallel with the coil control circuit in which the closed switch is present are also closed, the short-circuit switch circuit short-circuits the coil control circuit, so that, in the case of an open switch in the short-circuit switch circuit, at least one switch in the coil control circuit connected in parallel with the short-circuit switch circuit in which the closed switch is present should be in a closed state.
The controller described above is also configured to control at least one switch of the at least two coil control circuits to close such that the coil on the branch on which the closed switch is located heats up. That is, which coil is desired to be heated, the switch connected in series with which coil is closed, however, it is necessary to control the opening and closing of the switch in the short-circuit switch circuit in cooperation.
The following description will be given taking an example in which the at least two coil control circuits include two coil control circuits and each of the coil control circuits includes two coils (i.e., four coils in total).
Fig. 2 is a diagram of a combination of four coils provided by the present invention, and as shown in fig. 2, the heating circuit of the electromagnetic cooking appliance provided by the present invention can realize the combined heating of any one, two or three coils, and also can realize the combined heating of four coils. For example, any one of the following combinations of heating may be achieved: the combined heating of the first coil 10 and the second coil 20; the combined heating of the second coil 20 and the third coil 30; the combined heating of the first coil 10 and the fourth coil 40; the combined heating of the third coil 30 and the fourth coil 40; the combination of the first coil 10, the second coil 20 and the third coil 30 heats; the combination of the second coil 20, the third coil 30 and the fourth coil 40 heats; the combination of the first coil 10, the second coil 20, the third coil 30 and the fourth coil 40 heats, etc. It is understood that embodiments of the present invention are not so limited and may include any number of coils as desired for control.
Fig. 3 is a circuit diagram of a heating circuit of the electromagnetic cooking appliance provided according to fig. 2, and as shown in fig. 3, at least two coil control circuits include: the first coil control circuit Z11 comprises a first branch Z1 and a second branch Z2 which are connected in parallel, the first branch Z1 comprises a first coil 10, a first capacitor C1 and a first switch S1 which are connected in series, and the second branch Z2 comprises a second coil 20, a second capacitor C2 and a second switch S2 which are connected in series; and a second coil control circuit Z12 including a third branch Z3 and a fourth branch Z4 connected in parallel, the third branch Z3 including a third coil 30, a third capacitor C3 and a third switch S3 connected in series, and the fourth branch Z4 including a fourth coil 40, a fourth capacitor C4 and a fourth switch S4 connected in series.
As can be seen from fig. 3, the first coil 10, the first capacitor C1 and the first switch S1 connected in series form a first branch Z1, the second coil 20, the second capacitor C2 and the second switch S2 connected in series form a second branch Z2, the first branch Z1 is connected in parallel with the second branch Z2, the third coil 30, the third capacitor C3 and the third switch S3 connected in series form a third branch Z3, the fourth coil 40, the fourth capacitor C4 and the fourth switch S4 connected in series form a fourth branch Z4, and the third branch Z3 is connected in parallel with the fourth branch Z4. The first branch Z1 and the second branch Z2 are referred to as a first coil control circuit Z11, the third branch Z3 and the fourth branch Z4 are referred to as a second coil control circuit Z12, and the first coil control circuit Z11 is connected in series to the second coil control circuit Z12.
As shown in fig. 3, the at least two short-circuit switching circuits include: a first short-circuit switch circuit Z5 connected in parallel with the first coil control circuit Z11, the first short-circuit switch circuit Z5 including a fifth capacitor C5 and a fifth switch S5 connected in series; and a second short-circuit switch circuit Z6 connected in parallel with the second coil control circuit Z12, the second short-circuit switch circuit Z6 including a sixth capacitor C6 and a sixth switch S6 connected in series.
As can be seen from fig. 3, the first short-circuit switch circuit Z5 is connected in parallel with the first coil control circuit Z11, and the second short-circuit switch circuit Z6 is connected in parallel with the second coil control circuit Z12.
In the embodiment shown in fig. 3, the controller is configured to effect heating of at least one of the first coil 10, the second coil 20, the third coil 30 and the fourth coil 40 by controlling the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5 and the sixth switch S6.
Wherein the controller controls the first switch S1 and the second switch S2 to be opened in a case where the fifth switch S5 is controlled to be closed, and controls at least one of the first switch S1 and the second switch S2 to be closed in a case where the fifth switch S5 is controlled to be opened; and the controller controls the third switch S3 and the fourth switch S4 to be opened in a case where the sixth switch S6 is controlled to be closed, and controls at least one of the third switch S3 and the fourth switch S4 to be closed in a case where the sixth switch S6 is controlled to be opened.
The heating control strategy of the embodiment shown in fig. 3 is described in detail below.
1. Single coil heating case:
the first switch S1 and the sixth switch S6 are closed and the first coil 10 heats up;
the second switch S2 and the sixth switch S6 are closed and the second coil 20 heats up;
closing the third switch S3 and the fifth switch S5, the third coil 30 heats up;
the fourth switch S4 and the fifth switch S5 are closed and the fourth coil 40 heats up.
2. Case of combined heating of two coils:
closing the first switch S1, the second switch S2, and the sixth switch S6, the first coil 10 and the second coil 20 are heated simultaneously;
closing the first switch S1 and the third switch S3, the first coil 10 and the third coil 30 heat up simultaneously;
closing the first switch S1 and the fourth switch S4, the first coil 10 and the fourth coil 40 are heated simultaneously;
closing the second switch S2 and the third switch S3, the second coil 20 and the third coil 30 heat up simultaneously;
closing the second switch S2 and the fourth switch S4, the second coil 20 and the fourth coil 40 are heated simultaneously;
the third switch S3, fourth switch S4, and fifth switch S5 are closed and the third coil 30 and fourth coil 40 heat up simultaneously.
3. Case of three coils combined heating:
closing the first switch S1, the second switch S2, and the third switch S3, the first coil 10, the second coil 20, and the third coil 30 are heated simultaneously;
closing the first switch S1, the second switch S2, and the fourth switch S4, the first coil 10, the second coil 20, and the fourth coil 40 are heated simultaneously;
closing the first switch S1, the third switch S3, and the fourth switch S4, the first coil 10, the third coil 30, and the fourth coil 40 are heated simultaneously;
the second switch S2, the third switch S3, and the fourth switch S4 are closed and the second coil 20, the third coil 30, and the fourth coil 40 are heated simultaneously.
4. Case of four coils combined heating:
the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are closed, and the first coil 10, the second coil 20, the third coil 30, and the fourth coil 40 are heated simultaneously.
For simplicity of description, only which switch should be closed is described above, and the switches not mentioned are in the open state, for example, for "closing the second switch S2 and the fourth switch S4, the second coil 20 and the fourth coil 40 heat up simultaneously" in the case of 2, and for the first switch S1, the third switch S3, the fifth switch S5, and the sixth switch S6 not mentioned are all in the open state.
Further, for the two switches S7 and S8 shown in fig. 3, for example, an IGBT or a MOS transistor may be used.
Preferably, the first switch S1 to the sixth switch S6 are connected to the same node, that is, the first switch S1, the third switch S3, the fifth switch S5 and the sixth switch S6 are connected to the same node, and the circuit diagram is shown in fig. 3, and in practical applications, the first switch S1 to the sixth switch S6 are connected to the same node, so that the wiring space can be saved.
Accordingly, the present invention also provides an electromagnetic cooking appliance comprising the heating circuit of the above-described electromagnetic cooking appliance.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (11)
1. A heating circuit of an electromagnetic cooking appliance, characterized in that the heating circuit of the electromagnetic cooking appliance comprises:
at least two coil control circuits, the at least two coil control circuits being connected in series, a first coil control circuit of the at least two coil control circuits comprising at least two branches connected in parallel, each of the other coil control circuits of the at least two coil control circuits except the first coil control circuit comprising at least one branch, each of the branches comprising a coil, a capacitor and a switch connected in series;
wherein, when the at least one branch is two or more branches, the two or more branches are connected in parallel.
2. The heating circuit of the electromagnetic cooking appliance according to claim 1, further comprising:
the coil control circuit comprises at least two short-circuit switch circuits which are connected in series, one short-circuit switch circuit corresponds to one coil control circuit and is connected with the coil control circuit in parallel, and each short-circuit switch circuit of the at least two short-circuit switch circuits comprises a capacitor and a switch which are connected in series.
3. The heating circuit of the electromagnetic cooking appliance according to claim 2, wherein the at least two coil control circuits comprise:
the first coil control circuit comprises a first branch circuit and a second branch circuit which are connected in parallel, the first branch circuit comprises a first coil, a first capacitor and a first switch which are connected in series, and the second branch circuit comprises a second coil, a second capacitor and a second switch which are connected in series; and
and the second coil control circuit comprises a third branch and a fourth branch which are connected in parallel, the third branch comprises a third coil, a third capacitor and a third switch which are connected in series, and the fourth branch comprises a fourth coil, a fourth capacitor and a fourth switch which are connected in series.
4. The heating circuit of the electromagnetic cooking appliance according to claim 3, wherein the at least two short-circuiting switch circuits comprise:
a first short-circuit switch circuit connected in parallel with the first coil control circuit, the first short-circuit switch circuit including a fifth capacitor and a fifth switch connected in series; and
and the second short-circuit switch circuit is connected with the second coil control circuit in parallel and comprises a sixth capacitor and a sixth switch which are connected in series.
5. The heating circuit of the electromagnetic cooking appliance according to claim 4, wherein the first to sixth switches are connected to the same node.
6. The heating circuit of the electromagnetic cooking appliance according to claim 2, further comprising:
a controller for effecting heating of the coil of at least one branch of the at least two coil control circuits by controlling the switch in each of the at least two coil control circuits and the switch in each of the at least two short circuit switch circuits.
7. The heating circuit of the electromagnetic cooking appliance according to claim 6, wherein the controller is further configured to:
under the condition that at least one switch in the at least two short-circuit switch circuits is controlled to be closed, the switches in the coil control circuits which are connected with the short-circuit switch circuit where the closed switch is located in parallel are controlled to be opened; and
and under the condition of controlling at least one switch in the at least two short-circuit switch circuits to be opened, controlling at least one switch in a coil control circuit connected in parallel with the short-circuit switch circuit where the opened switch is positioned to be closed.
8. The heating circuit of the electromagnetic cooking appliance according to claim 6, wherein the controller controls at least one switch of the at least two coil control circuits to be closed so that the coil on the branch on which the closed switch is located is heated.
9. The heating circuit of the electromagnetic cooking appliance according to claim 4, further comprising:
a controller for effecting heating of at least one of the first, second, third and fourth coils by controlling the first, second, third, fourth, fifth and sixth switches.
10. The heating circuit of an electromagnetic cooking appliance according to claim 9,
the controller controls the first switch and the second switch to be opened when controlling the fifth switch to be closed, and controls at least one of the first switch and the second switch to be closed when controlling the fifth switch to be opened; and
the controller controls the third switch and the fourth switch to be opened under the condition that the sixth switch is controlled to be closed, and controls at least one of the third switch and the fourth switch to be closed under the condition that the sixth switch is controlled to be opened.
11. An electromagnetic cooking appliance, characterized in that it comprises a heating circuit of an electromagnetic cooking appliance according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910266629.3A CN111787654A (en) | 2019-04-03 | 2019-04-03 | Heating circuit of electromagnetic cooking utensil and electromagnetic cooking utensil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910266629.3A CN111787654A (en) | 2019-04-03 | 2019-04-03 | Heating circuit of electromagnetic cooking utensil and electromagnetic cooking utensil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111787654A true CN111787654A (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910266629.3A Pending CN111787654A (en) | 2019-04-03 | 2019-04-03 | Heating circuit of electromagnetic cooking utensil and electromagnetic cooking utensil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111787654A (en) |
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2019
- 2019-04-03 CN CN201910266629.3A patent/CN111787654A/en active Pending
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