Heating circuit of electromagnetic cooking appliance and electromagnetic cooking appliance

Abstract

The present invention provides a heating circuit for an electromagnetic cooking appliance and the electromagnetic cooking appliance, belonging to the field of electrical appliances. 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 at least two coil control circuits, except the first coil control circuit, comprising at least one branch, each branch comprising a coil, a capacitor, and a switch connected in series; wherein, when the at least one branch comprises two or more branches, the two or more branches are connected in parallel. By connecting the coil control circuits in series, the present invention combines multiple coils and their series capacitors to achieve improved output power performance of the electromagnetic cooking appliance.

Description

Technical Field

[0001] The present invention relates to the field of electrical appliances, in particular to a heating circuit of an electromagnetic cooking appliance and the electromagnetic cooking appliance. Background Art

[0002] Induction cookers mainly use high-power switching devices (such as IGBTs (Insulated Gate Bipolar Transistors)) to drive the coil to generate an alternating magnetic field, which heats up the pot inside.

[0003] In the related art, a heating circuit uses one or two switching devices to control a coil for heating. However, this control method does not maximize the utilization of the hardware in the circuit (eg, resonant capacitor, coil, switching device, etc.). Summary of the Invention

[0004] The object of the present invention is to provide a heating circuit for an electromagnetic cooking appliance and the electromagnetic cooking appliance, which are used to solve the problem of connecting coils with different paths in series.

[0005] To achieve the above-mentioned objectives, the present invention provides a heating circuit for an electromagnetic cooking appliance, the heating circuit comprising: 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 branch comprising a coil, a capacitor, and a switch connected in series; wherein, when the at least one branch comprises two or more branches, the two or more branches are connected in parallel.

[0006] Preferably, the heating circuit of the electromagnetic cooking appliance also includes: at least two short-circuit switch circuits, the at least two short-circuit switch circuits are connected in series, one short-circuit switch circuit corresponds to one coil control circuit, and the short-circuit switch circuit is connected in parallel with the coil control circuit, and each of the at least two short-circuit switch circuits includes a capacitor and a switch connected in series.

[0007] Preferably, the at least two coil control circuits include: a first coil control circuit, including a first branch and a second branch connected in parallel, the first branch including a first coil, a first capacitor, and a first switch connected in series, and the second branch including a second coil, a second capacitor, and a second switch connected in series; and a second coil control circuit, including a third branch and a fourth branch connected in parallel, the third branch including a third coil, a third capacitor, and a third switch connected in series, and the fourth branch including a fourth coil, a fourth capacitor, and a fourth switch connected in series.

[0008] 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.

[0009] Preferably, the first to sixth switches are connected to the same node.

[0010] Preferably, the heating circuit of the electromagnetic cooking appliance further includes: a controller for heating the coil of at least one branch of the at least two coil control circuits by controlling a switch in each of the at least two coil control circuits and a switch in each of the at least two short-circuit switch circuits.

[0011] Preferably, the controller is further configured to: when controlling at least one switch in the at least two short-circuit switch circuits to be closed, control all switches in the coil control circuit connected in parallel with the short-circuit switch circuit where the closed switch is located to be opened; and when controlling at least one switch in the at least two short-circuit switch circuits to be opened, control at least one switch in the coil control circuit connected in parallel with the short-circuit switch circuit where the opened switch is located to be closed.

[0012] Preferably, the controller controls at least one switch in the at least two coil control circuits to be closed so that the coil on the branch where the closed switch is located is heated.

[0013] Preferably, the heating circuit of the electromagnetic cooking appliance further includes: a controller for heating at least one of the first coil, the second coil, the third coil and the fourth coil by controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch.

[0014] Preferably, 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 when controlling the sixth switch to be closed, and controls at least one of the third switch and the fourth switch to be closed when controlling the sixth switch to be opened.

[0015] Correspondingly, the present invention further provides an electromagnetic cooking appliance, which includes the heating circuit of the electromagnetic cooking appliance described above.

[0016] Through the above technical solution, the present invention realizes performance improvement of the output power of the electromagnetic cooking appliance by connecting the coil control circuit in series to combine multiple coils and their series capacitors.

[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a block diagram of the heating circuit of the electromagnetic cooking appliance provided by the present invention;

[0020] Figure 2 is a diagram of a four-coil combination provided by the present invention; and

[0021] Figure 3 is based on Figure 2 Provides a circuit diagram of the heating circuit of an induction cooking appliance. DETAILED DESCRIPTION

[0022] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0023] Figure 1 This is a block diagram of the heating circuit of the electromagnetic cooking appliance provided by the present invention, such as Figure 1As shown, the heating circuit of the electromagnetic cooking appliance includes: at least two coil control circuits, the at least two coil control circuits are connected in series, a first coil control circuit of the at least two coil control circuits includes 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 includes at least one branch, each branch includes a coil, a capacitor and a switch connected in series; wherein, when at least one branch is two or more branches, the two or more branches are connected in parallel.

[0024] Here, “first” is merely an exemplary description for the convenience of description and does not limit the present invention. For example, the first coil control circuit is any one of the at least two coil control circuits.

[0025] 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. When the other coil control circuit includes two or more branches, the two or more branches are connected in parallel.

[0026] All branches in at least two coil control circuits include coils, capacitors, and switches connected in series. The specific description is as follows: when the coil control circuit includes one branch, the branch includes the coils, capacitors, and switches connected in series. When the coil control circuit includes multiple branches connected in parallel, each branch includes the coils, capacitors, and switches connected in series. That is, the coils, capacitors, and switches are connected in series and then in parallel as a whole.

[0027] like Figure 1 As shown, the heating circuit of the electromagnetic cooking appliance provided by the present invention also includes: at least two short-circuit switch circuits, the at least two short-circuit switch circuits are connected in series, one short-circuit switch circuit corresponds to one coil control circuit, and the short-circuit switch circuit is connected in parallel with the coil control circuit, and each of the at least two short-circuit switch circuits includes a capacitor and a switch connected in series.

[0028] Each coil control circuit is connected in parallel with a short-circuit switch circuit, that is, a coil control circuit is connected in parallel with a short-circuit switch circuit. It should be noted that a coil control circuit may include one or more branches consisting of series-connected coils, capacitors and switches. No matter how many branches the coil control circuit includes, a coil control circuit is connected in parallel with a short-circuit switch circuit.

[0029] Furthermore, the heating circuit of the electromagnetic cooking appliance provided by the present invention further includes a controller configured to heat the coil of at least one branch of the at least two coil control circuits by controlling a switch in each of the at least two coil control circuits and a switch in each of the at least two short-circuit switch circuits. It will be readily understood that if a switch is closed, the coil connected in series with the closed switch is heated, and if the switch is open, the coil connected in series with the open switch is not heated.

[0030] Specifically, the controller is also used to: when controlling at least one switch in at least two short-circuit switch circuits to be closed, control all switches in the coil control circuit connected in parallel with the short-circuit switch circuit where the closed switch is located to be opened; and when controlling at least one switch in at least two short-circuit switch circuits to be opened, control at least one switch in the coil control circuit connected in parallel with the short-circuit switch circuit where the opened switch is located to be closed.

[0031] If all switches in the parallel-connected short-circuit switch circuit and coil control circuit are simultaneously open, the entire circuit is in an open-circuit state. Therefore, all switches in the parallel-connected short-circuit switch circuit and coil control circuit cannot be simultaneously open. That is, when a switch in the short-circuit switch circuit is closed, all switches in the coil control circuit connected in parallel with the short-circuit switch circuit containing the closed switch must also be open. 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 with the closed switch are also closed, the short-circuit switch circuit short-circuits the coil control circuit. Therefore, when a switch in the short-circuit switch circuit is open, at least one switch in the coil control circuit connected in parallel with the short-circuit switch circuit with the closed switch must be closed.

[0032] The controller described above is also used to control the closure of at least one switch in at least two coil control circuits to heat the coils in the branch where the closed switch resides. In other words, the switch connected in series to the coil to be heated is closed. However, this requires coordination with the opening and closing of the switch in the short-circuit switch circuit.

[0033] The following description will be made by taking as an example that the at least two coil control circuits include two coil control circuits and each coil control circuit includes two coils (ie, a total of four coils).

[0034] Figure 2 is a diagram of the four coil combinations provided by the present invention, such as Figure 2As shown, the heating circuit of the electromagnetic cooking appliance provided by the present invention can achieve combined heating of any one, two, or three coils, or can also achieve combined heating of all four coils. For example, any of the following combined heating can be achieved: combined heating of the first coil 10 and the second coil 20; combined heating of the second coil 20 and the third coil 30; combined heating of the first coil 10 and the fourth coil 40; combined heating of the third coil 30 and the fourth coil 40; combined heating of the first coil 10, the second coil 20, and the third coil 30; combined heating of the second coil 20, the third coil 30, and the fourth coil 40; combined heating of the first coil 10, the second coil 20, the third coil 30, and the fourth coil 40, etc. It will be understood that the embodiments of the present invention are not limited to this and can include any number of coils according to control requirements.

[0035] Figure 3 is based on Figure 2 Provide a circuit diagram of the heating circuit of the electromagnetic cooking appliance, such as Figure 3 As shown, at least two coil control circuits include: a first coil control circuit Z11, including a first branch Z1 and a second branch Z2 connected in parallel, the first branch Z1 includes a first coil 10, a first capacitor C1, and a first switch S1 connected in series, and the second branch Z2 includes a second coil 20, a second capacitor C2, and a second switch S2 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 includes a third coil 30, a third capacitor C3, and a third switch S3 connected in series, and the fourth branch Z4 includes a fourth coil 40, a fourth capacitor C4, and a fourth switch S4 connected in series.

[0036] from Figure 3 As can be seen, the series connection of the first coil 10, the first capacitor C1, and the first switch S1 forms a first branch Z1. The series connection of the second coil 20, the second capacitor C2, and the second switch S2 forms a second branch Z2. The first branch Z1 and the second branch Z2 are connected in parallel. The series connection of the third coil 30, the third capacitor C3, and the third switch S3 forms a third branch Z3. The series connection of the fourth coil 40, the fourth capacitor C4, and the fourth switch S4 forms a fourth branch Z4. The third branch Z3 and the fourth branch Z4 are connected in parallel. The first branch Z1 and the second branch Z2 are referred to as the first coil control circuit Z11, and the third branch Z3 and the fourth branch Z4 are referred to as the second coil control circuit Z12. The first coil control circuit Z11 and the second coil control circuit Z12 are connected in series.

[0037] like Figure 3As shown, at least two short-circuit switch 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 includes 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 includes a sixth capacitor C6 and a sixth switch S6 connected in series.

[0038] from Figure 3 It can be seen that 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 .

[0039] exist Figure 3 In the illustrated embodiment, the controller is configured to heat 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 .

[0040] The controller controls the first switch S1 and the second switch S2 to be opened when the fifth switch S5 is closed, and controls at least one of the first switch S1 and the second switch S2 to be closed when the fifth switch S5 is closed; and controls the third switch S3 and the fourth switch S4 to be opened when the sixth switch S6 is closed, and controls at least one of the third switch S3 and the fourth switch S4 to be closed when the sixth switch S6 is closed.

[0041] The following details Figure 3 Heating control strategy of the illustrated embodiment.

[0042] 1. Single coil heating situation:

[0043] The first switch S1 and the sixth switch S6 are closed, and the first coil 10 is heated;

[0044] The second switch S2 and the sixth switch S6 are closed, and the second coil 20 is heated;

[0045] The third switch S3 and the fifth switch S5 are closed, and the third coil 30 is heated;

[0046] The fourth switch S4 and the fifth switch S5 are closed, and the fourth coil 40 is heated.

[0047] 2. Combination heating of two coils:

[0048] The first switch S1, the second switch S2 and the sixth switch S6 are closed, and the first coil 10 and the second coil 20 are heated simultaneously;

[0049] Close the first switch S1 and the third switch S3, and the first coil 10 and the third coil 30 are heated simultaneously;

[0050] Close the first switch S1 and the fourth switch S4, and the first coil 10 and the fourth coil 40 are heated simultaneously;

[0051] The second switch S2 and the third switch S3 are closed, and the second coil 20 and the third coil 30 are heated simultaneously;

[0052] The second switch S2 and the fourth switch S4 are closed, and the second coil 20 and the fourth coil 40 are heated simultaneously;

[0053] The third switch S3 , the fourth switch S4 and the fifth switch S5 are closed, and the third coil 30 and the fourth coil 40 are heated simultaneously.

[0054] 3. The situation of three coils combined heating:

[0055] The first switch S1, the second switch S2 and the third switch S3 are closed, and the first coil 10, the second coil 20 and the third coil 30 are heated simultaneously;

[0056] The first switch S1, the second switch S2 and the fourth switch S4 are closed, and the first coil 10, the second coil 20 and the fourth coil 40 are heated simultaneously;

[0057] The first switch S1, the third switch S3 and the fourth switch S4 are closed, and the first coil 10, the third coil 30 and the fourth coil 40 are heated simultaneously;

[0058] 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.

[0059] 4. Combination heating of four coils:

[0060] 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.

[0061] To simplify the description, only the switch that should be closed is described above, and the switches not mentioned are in the open state. For example, in the second case, "the second switch S2 and the fourth switch S4 are closed, and the second coil 20 and the fourth coil 40 are heated simultaneously", the first switch S1, the third switch S3, the fifth switch S5 and the sixth switch S6 that are not mentioned are all in the open state.

[0062] In addition, for Figure 3 The two switches S7 and S8 shown in the figure may be, for example, IGBTs or MOS tubes.

[0063] 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. Figure 3 For example, in practical applications, connecting the first switch S1 to the sixth switch S6 to the same node can save wiring space.

[0064] Accordingly, the present invention further provides an electromagnetic cooking appliance, which includes the heating circuit of the electromagnetic cooking appliance described above.

[0065] The above describes in detail the optional implementation methods of the embodiments of the present invention in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the scope of protection of the embodiments of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0067] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A heating circuit for 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 branch 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; At least two short-circuit switch circuits are connected in series, one short-circuit switch circuit corresponds to one coil control circuit, and the short-circuit switch circuit is connected in parallel with the coil control circuit, and each of the at least two short-circuit switch circuits includes a capacitor and a switch connected in series.

2. The heating circuit of the electromagnetic cooking appliance according to claim 1, characterized in that: The at least two coil control circuits include: a first coil control circuit comprising a first branch and a second branch connected in parallel, wherein the first branch comprises a first coil, a first capacitor, and a first switch connected in series, and the second branch comprises a second coil, a second capacitor, and a second switch connected in series; and The second coil control circuit includes a third branch and a fourth branch connected in parallel. The third branch includes a third coil, a third capacitor, and a third switch connected in series. The fourth branch includes a fourth coil, a fourth capacitor, and a fourth switch connected in series.

3. The heating circuit of the electromagnetic cooking appliance according to claim 2, characterized in that: 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 comprising a fifth capacitor and a fifth switch connected in series; and The second short-circuit switch circuit is connected in parallel with the second coil control circuit, and the second short-circuit switch circuit includes a sixth capacitor and a sixth switch connected in series.

4. The heating circuit of the electromagnetic cooking appliance according to claim 3, characterized in that: The first to sixth switches are connected to the same node.

5. The heating circuit of the electromagnetic cooking appliance according to claim 1, characterized in that: The heating circuit of the electromagnetic cooking appliance further comprises: A controller is used to achieve heating of the coil of at least one branch of the at least two coil control circuits by controlling a switch in each of the at least two coil control circuits and a switch in each of the at least two short-circuit switch circuits.

6. The heating circuit of the electromagnetic cooking appliance according to claim 5, characterized in that: The controller is also used for: When at least one of the at least two short-circuit switch circuits is controlled to be closed, all switches in the coil control circuit connected in parallel with the short-circuit switch circuit where the closed switch is located are controlled to be opened; as well as When at least one switch in the at least two short-circuit switch circuits is controlled to be opened, at least one switch in the coil control circuit connected in parallel with the short-circuit switch circuit where the opened switch is located is controlled to be closed.

7. The heating circuit of the electromagnetic cooking appliance according to claim 5, characterized in that: The controller controls at least one switch in the at least two coil control circuits to be closed so that the coil on the branch where the closed switch is located is heated.

8. The heating circuit of the electromagnetic cooking appliance according to claim 3, characterized in that: The heating circuit of the electromagnetic cooking appliance further comprises: A controller is configured to heat at least one of the first coil, the second coil, the third coil, and the fourth coil by controlling the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch.

9. The heating circuit of the electromagnetic cooking appliance according to claim 8, characterized in that: The controller controls the first switch and the second switch to be opened when the fifth switch is closed, and controls at least one of the first switch and the second switch to be closed when the fifth switch is opened. as well as The controller controls the third switch and the fourth switch to be opened when controlling the sixth switch to be closed, and controls at least one of the third switch and the fourth switch to be closed when controlling the sixth switch to be opened.

10. An electromagnetic cooking appliance, characterized in that: The electromagnetic cooking appliance comprises the heating circuit of the electromagnetic cooking appliance according to any one of claims 1 to 9.

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