WO2019242185A1

WO2019242185A1 - Method and system for controlling microwave output, and microwave oven

Info

Publication number: WO2019242185A1
Application number: PCT/CN2018/111877
Authority: WO
Inventors: 郭兴川
Original assignee: 广东美的厨房电器制造有限公司; 美的集团股份有限公司
Priority date: 2018-06-20
Filing date: 2018-10-25
Publication date: 2019-12-26
Also published as: CN109041316A

Abstract

A method and system for controlling microwave output, and a microwave oven. The system comprises: a plurality of magnetron modules (11) connected in parallel, a controller (12) connected to the plurality of magnetron modules, and a power supply (13) for supplying power to the plurality of magnetron modules (11) and the controller (12), wherein the magnetron module (11) is used for outputting a microwave; the controller (12) is used for receiving a control instruction and searching the output power of the plurality of magnetron modules (11) corresponding to the control instruction, so as to respectively control the output power of the plurality of magnetron modules (11) to output microwaves. The system can control the output of different thermal power of two magnetrons.

Description

Method, system and microwave oven for controlling microwave output

Technical field

The invention relates to the technical field of microwave heating, in particular to a method, a system and a microwave oven for controlling microwave output.

Background technique

Traditional microwave ovens or devices with microwave functions are usually equipped with a single magnetron. However, as users demand equipment to improve efficiency and shorten working cycles, the demand for equipment equipped with dual magnetrons has gradually increased. The circuit and control of the original single magnetron cannot meet the requirements of the dual magnetron.

Summary of the Invention

An object of the embodiments of the present invention is to provide a method, a system, and a microwave oven for controlling microwave output, which realize different microwave outputs of multiple magnetrons.

In order to achieve the above object, an embodiment of the present invention provides a system for controlling a microwave output. The system is applied to a microwave heating device. The system includes a plurality of magnetron modules connected in parallel, and the plurality of magnetrons. A controller connected to the module and a power supply for supplying power to the plurality of magnetron modules and the controller, wherein the magnetron module is configured to output microwaves; the controller is configured to receive control instructions and The output power of the plurality of magnetron modules corresponding to the control instruction is used to control the plurality of magnetron modules to output microwaves respectively according to the output power.

Optionally, the system further includes a plurality of protection modules, and the protection modules are connected between the magnetron module to be protected and the power source.

Optionally, the protection module includes a magnetron temperature controller for detecting a temperature of the magnetron in the magnetron module, and disconnecting the The power supply of the magnetron module is described.

Optionally, the protection module further includes a primary switch for disconnecting the power supply of the magnetron module when the door of the microwave heating device is detected to be open.

Optionally, the system further includes a secondary switch for sending a door opening signal to the controller when the door of the microwave heating device is detected to be open; the controller is further configured for receiving the door when the door is opened. Controlling the plurality of magnetron modules to stop working when the door is opened.

Optionally, the protection module further includes a monitoring switch, which is connected in parallel to both ends of the magnetron module to be protected, when the primary switch and the secondary switch fail, and the detection of the microwave heating device is detected. When the door is opened, the magnetron module is short-circuited; the controller is further configured to control the plurality of magnetron modules to stop working when a short-circuit current is detected.

Optionally, the protection module further includes a fuse, which is connected in series between the magnetron module to be protected and the power supply, and is used when the primary switch and the secondary switch fail and detects When the short-circuit current is greater than a preset fusing current, the connection between the magnetron module and the power supply is disconnected.

Optionally, the system further includes a cavity thermostat, which is connected in series between any protection module and the power source, and is used to detect the temperature in the microwave heating device, and when the When the temperature in the microwave heating device is greater than the preset cavity temperature, the power supply of the magnetron module corresponding to any one of the protection modules and the controller is disconnected.

Optionally, the magnetrons in the plurality of magnetron modules are respectively disposed on different sides in the microwave heating device.

Correspondingly, an embodiment of the present invention further provides a microwave oven, and the microwave oven includes the foregoing system for controlling microwave output.

Correspondingly, an embodiment of the present invention also provides a method for controlling microwave output. The method includes: receiving a control instruction; searching for the output power of a plurality of magnetron modules corresponding to the control instruction; Controlling the plurality of magnetron modules to output microwaves.

Optionally, the method further includes: when detecting that the door of the microwave heating device is opened, controlling the plurality of magnetron modules to stop working.

Optionally, the method further includes: when it is detected that the door of the microwave heating device is opened, monitoring switches connected in parallel to both ends of the magnetron module short-circuit the magnetron module; when a short-circuit current is detected And controlling the plurality of magnetron modules to stop working.

According to the above technical solution, the system for controlling microwave output is applied to a microwave heating device, and the system includes a plurality of magnetron modules connected in parallel, a controller connected to the plurality of magnetron modules, and a The plurality of magnetron modules and the power source supplied by the controller, after the controller receives the control instruction, find the output power of the plurality of magnetron modules corresponding to the control instruction, and use the output power Control the plurality of magnetron modules to output microwaves respectively. The embodiment of the present invention solves the problem that the prior art cannot control the output of two magnetrons with different firepower, realizes different microwave outputs of multiple magnetrons, and optimizes the cooking effect through different microwave distributions.

Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed implementation sections.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the description. Together with the following specific implementations, the drawings are used to explain the embodiments of the present invention, but not to limit the embodiments of the present invention. In the drawings:

FIG. 1 is a schematic structural diagram of a system for controlling microwave output according to an embodiment of the present invention; FIG.

2 is a schematic structural diagram of another system for controlling microwave output according to an embodiment of the present invention;

3 is a schematic structural diagram of another system for controlling microwave output according to an embodiment of the present invention;

4 is a schematic structural diagram of still another system for controlling microwave output according to an embodiment of the present invention;

5 is a schematic structural diagram of still another system for controlling microwave output according to an embodiment of the present invention;

6 is a schematic structural diagram of still another system for controlling microwave output according to an embodiment of the present invention;

7 is a schematic structural diagram of another system for controlling a microwave output according to an embodiment of the present invention;

8 is a schematic structural diagram of another system for controlling microwave output according to an embodiment of the present invention;

9 is a schematic circuit diagram of a system for controlling microwave output according to an embodiment of the present invention;

FIG. 10 is a schematic flowchart of a method for controlling microwave output according to an embodiment of the present invention.

detailed description

The specific implementations of the embodiments of the present invention will be described in detail below with reference to the drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

FIG. 1 is a schematic structural diagram of a system for controlling microwave output according to an embodiment of the present invention. As shown in FIG. 1, the system is applied to a microwave heating device, and the system includes a plurality of magnetron modules 11 connected in parallel, a controller 12 connected to the plurality of magnetron modules, and a plurality of A magnetron module 11 and a power source 13 powered by the controller 12, wherein the magnetron module 11 is used to output microwaves; the controller 12 is used to receive a control instruction and find a corresponding one of the control instructions The output powers of the plurality of magnetron modules are respectively used to control the plurality of magnetron modules to output microwaves.

In an embodiment of the present invention, the magnetron module may include a transformer, a magnetron, and a relay. The transformer is used to adjust the power supply voltage of the magnetron. The relay is connected in series with the transformer. Between the power source and the controller, the controller is configured to control the on / off of the corresponding relays in the plurality of magnetron modules according to the output power of the plurality of magnetron modules corresponding to the control instruction. For example, when the plurality of magnetron modules are two magnetron modules, the received control instruction is that the firepower of the microwave output by the first magnetron module is 30%, and the power of the microwave output by the second magnetron module is 30%. The firepower is 70%, so if the duty cycle is 10 seconds, then the relay corresponding to the first magnetron module is controlled to be closed for 3 seconds, opened for 7 seconds, and the second magnetron is controlled for 10 seconds. The corresponding relay of the module is in the closed state in 7 seconds and the open state in 3 seconds in the 10-second working cycle, and the above two magnetron modules have full power output in the working state.

In another embodiment of the present invention, the magnetron module may include a frequency converter, a magnetron, and a relay. The relay is connected in series between the frequency converter and the power source. The output power of the plurality of magnetron modules corresponding to the control instruction is sent to a corresponding inverter, and the inverter is configured to receive the output power and control the corresponding magnetron to output microwaves according to the frequency corresponding to the output power. For example, the relay in this embodiment is only responsible for the on-off between the inverter and the power supply, and the control of the output of microwave power is performed by the inverter. When the plurality of magnetron modules are two magnetrons When the module is received, the control command received is that the microwave power output by the first magnetron module is 30%, and when the microwave power output by the second magnetron module is 70%, the inverter of the first magnetron module outputs 30 % Of the frequency to the magnetron, so that the output of microwave power is 30%, and the inverter of the second magnetron outputs 70% of the frequency to the magnetron, making it output 70% of the microwave power. It should be noted that the manner in which the transformer and the frequency converter control the magnetron is not a technical point of the present invention, and reference may be made to the implementation manner in the prior art, which is not repeated here.

No matter which of the above embodiments is adopted, the firepower output of different microwaves of multiple magnetron modules can be achieved. In addition to the example of individually setting a single magnetron module in the foregoing embodiment, the correspondence relationship between the cooking mode and the output power of multiple magnetron modules can also be set in advance. For example, when the multiple magnetron modules are For two magnetron modules, when the cooking mode is cooking milk, the preset microwave power of the output of the first magnetron module is 30%, and the microwave power of the output of the second magnetron module is 20%. After the controller finds the fire power of the output microwave corresponding to the cooking mode, the controller controls the two magnetron modules to output the microwave. In the embodiment of the present invention, the correspondence between the control instruction and the output power of the multiple magnetron modules is not limited, as long as microwave outputs with different firepowers of the multiple magnetron modules can be realized.

In addition, in order to improve the safety of multiple magnetron modules, as shown in FIG. 2, the system further includes multiple protection modules 14 that are connected to the magnetron modules to be protected and the magnetron modules. Between power. Each magnetron module is provided with a corresponding protection module to protect it.

As shown in FIG. 3, the protection module 14 includes a magnetron temperature controller 141 for detecting the temperature of the magnetron in the magnetron module, and when the temperature of the magnetron is greater than a preset value At the temperature, the power supply of the magnetron module is disconnected. Wherein, the magnetron temperature controller may be installed on the magnetron housing or embedded in the magnetron, and its installation position may be determined according to the specific conditions of the magnetron and the microwave heating device. In the present invention The installation position is not limited in the embodiment, as long as the temperature of the magnetron can be accurately detected.

In addition, as shown in FIG. 4, the protection module 14 further includes a primary switch 142 for disconnecting the power supply of the magnetron module when the door of the microwave heating device is detected to be open. The primary switch is connected in series between the power source and the magnetron module. The primary switch is installed at the opening and closing position of the door body of the microwave heating device, and it is convenient to detect that the door body is opened when the microwave heating device is working, thereby disconnecting the power supply of the magnetron module. Avoid microwave leakage in circuit form.

In addition, as shown in FIG. 5, the system further includes a secondary switch 51 for sending a door opening signal to the controller when the door of the microwave heating device is detected to be open; the controller 12 also uses And controlling the plurality of magnetron modules to stop working when the door opening signal is received. Like the primary switch, the secondary switch is installed at the opening and closing position of the door body of the microwave heating device, so that when the microwave heating device works, it is convenient to detect that the door body is open, thereby sending a door opening signal to the controller. , Which controls the plurality of magnetron modules to stop working. Therefore, the secondary switch is logically protected against microwave leakage.

In addition, as shown in FIG. 6, the protection module 14 further includes a monitoring switch 143. The monitoring switch 143 is connected in parallel to both ends of the magnetron module to be protected, and is used to detect when the primary switch and the secondary switch fail. When the door of the microwave heating device is opened, the magnetron module is short-circuited; the controller 12 is further configured to control the plurality of magnetron modules to stop working when a short-circuit current is detected. The installation position of the monitoring switch is the same as that of the primary switch and the secondary switch, and they are arranged at the opening and closing positions of the door body of the microwave heating device, so that it is convenient to detect that the door body is open when the microwave heating device is working, so The magnetron module is short-circuited, so that the controller detects the short-circuit current and controls the plurality of magnetron modules to stop working. Therefore, the monitoring switch is both a circuit and a logic to prevent microwave leakage.

For the above-mentioned primary switch, secondary switch, and monitoring switch, a mechanical switch can be used, or a proximity switch that achieves an on-off effect can be used.

In addition, as shown in FIG. 7, the protection module 14 further includes a fuse 144, which is connected in series between the magnetron module to be protected and the power source, and is used to detect when the short-circuit current is greater than When the preset fuse current is disconnected, the connection between the magnetron module and the power supply is disconnected. In one embodiment of the present invention, a fuse can be used to avoid microwave leakage.

In addition, as shown in FIG. 8, the system further includes a cavity temperature controller 81, which is connected in series between any protection module and the power supply, and the cavity temperature controller is connected in series. The loop is used to power the controller, the cavity temperature controller is used to detect the temperature in the microwave heating device, and when the temperature in the microwave heating device is greater than a preset cavity temperature, the circuit is disconnected. The power of the magnetron module corresponding to any protection module and the controller is turned off, so that the controller disconnects the power of all the magnetron modules. Wherein, the cavity temperature controller may be installed above the microwave heating device, or other cavity parts, to detect the temperature in the microwave heating device at any time, and when the temperature in the microwave heating device is greater than a preset value When the temperature of the cavity is turned off, the power supply of the magnetron module and the controller on the circuit where the cavity is located is disconnected.

The plurality of magnetron modules are two magnetron modules, and the magnetron modules include a transformer. As an example, the magnetron and the relay are shown in FIG. 9. The system for controlling the microwave output includes two magnetron modules 11. Among them, the magnetron thermostat 141, the fuse 144 and The front and rear positions of the cavity temperature controller 81 in the circuit can be changed, and the front and back positions of the magnetron temperature controller 141 and the fuse 144 in another protection module can also be changed.

In an embodiment of the present invention, the magnetrons in the plurality of magnetron modules are respectively disposed on different sides in the microwave heating device, so that a microwave distribution with various effects can be generated, and the cooking effect can be improved. .

Through the above embodiments, the circuit safety problem of multiple magnetron modules can be solved, and it can protect the device when the temperature and current of the device are abnormal, reducing or even preventing abnormal microwave operation, and damage caused by abnormal current and device temperature. . In addition, it also solves the problem of independent control of multiple magnetron modules. For microwave heating devices, different cooking power can be achieved by controlling the microwave output of multiple magnetron modules with different firepower.

Correspondingly, an embodiment of the present invention further provides a microwave oven, and the microwave oven includes the system for controlling microwave output according to the foregoing embodiment.

FIG. 10 is a schematic flowchart of a method for controlling microwave output according to an embodiment of the present invention. As shown in FIG. 10, the method includes the following steps:

Step 1001: Receive a control instruction.

Step 1002: Find the output power of multiple magnetron modules corresponding to the control instruction.

Step 1003: Control the plurality of magnetron modules to output microwaves according to the output power.

Through the embodiments of the present invention, the microwave output of the two magnetron modules with different firepower can be controlled to achieve different cooking effects. For example, when defrosting food, taking the plurality of magnetron modules as two magnetron modules as an example, the user can enter a control command for the cooking mode of the defrosted food. After the microwave heating device receives the control command, it searches for The output power of the two magnetron modules corresponding to the control instruction, for example, the corresponding output power is one 20% and the other 30%, so that the two magnetron modules are respectively controlled to output microwaves according to the output power. Optionally, the user can also control the output microwaves corresponding to the input and output powers of the two magnetron modules.

In addition, in an embodiment of the present invention, when it is detected that the door of the microwave heating device is opened, the plurality of magnetron modules are controlled to stop working. This embodiment ensures the safety when using the microwave heating device and prevents microwave leakage.

In addition, in another embodiment of the present invention, when it is detected that the door of the microwave heating device is opened, the monitoring switches connected in parallel to both ends of the magnetron module short-circuit the magnetron module; When the short-circuit current is reached, the plurality of magnetron modules are controlled to stop working.

The embodiment of the present invention solves the problem of independent control of multiple magnetron modules. For microwave heating devices, different cooking effects can be achieved by controlling the microwave output of multiple magnetron modules with different firepower.

The optional implementations of the embodiments of the present invention have been described above in detail with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the foregoing implementations. Within the scope of the technical concept of the embodiments of the present invention, the embodiments of the present invention The technical solution of the present invention performs various simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

In addition, it should be noted that the specific technical features described in the foregoing specific embodiments can be combined in any suitable manner without conflict. In order to avoid unnecessary repetition, the embodiments of the present invention do not separately describe various possible combinations.

Those skilled in the art can understand that all or part of the steps in the method of the above embodiments can be completed by a program instructing related hardware. The program is stored in a storage medium and includes a number of instructions to enable a microcontroller, a chip, or a processor. (processor) executes all or part of the steps of the method described in each embodiment of the present application. The foregoing storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes .

In addition, various combinations of the embodiments of the present invention can also be arbitrarily combined, as long as it does not violate the idea of the embodiment of the present invention, it should also be regarded as the content disclosed in the embodiment of the present invention.

Claims

A system for controlling microwave output, characterized in that the system is applied to a microwave heating device, and the system includes:

A plurality of magnetron modules connected in parallel, a controller connected to the plurality of magnetron modules, and a power supply for supplying power to the plurality of magnetron modules and the controller,

Wherein, the magnetron module is used to output microwaves;

The controller is configured to receive a control instruction and find output powers of a plurality of magnetron modules corresponding to the control instructions, and respectively control the plurality of magnetron modules to output microwaves with the output power.
The system according to claim 1, further comprising a plurality of protection modules, the protection modules being connected between the magnetron module to be protected and the power source.
The system according to claim 2, wherein the protection module comprises a magnetron temperature controller for detecting the temperature of the magnetron in the magnetron module, and when the temperature of the magnetron is When the temperature is higher than the preset temperature, the power supply of the magnetron module is disconnected.
The system according to claim 2, wherein the protection module further comprises a primary switch for disconnecting power from the magnetron module when the door of the microwave heating device is detected to be open.
The system of claim 4, wherein:

The system further includes a secondary switch for sending a door opening signal to the controller when the door of the microwave heating device is detected to be open;

The controller is further configured to control the plurality of magnetron modules to stop working when the door opening signal is received.
The system according to claim 5, wherein:

The protection module further includes a monitoring switch, which is connected in parallel to both ends of the magnetron module to be protected, and is used when the primary switch and the secondary switch fail and it is detected that the door of the microwave heating device is opened. Short the magnetron module;

The controller is further configured to control the plurality of magnetron modules to stop working when a short-circuit current is detected.
The system according to claim 6, wherein:

The protection module further includes a fuse, which is connected in series between the magnetron module to be protected and the power source, and is used when the primary switch and the secondary switch fail, and the short-circuit current is detected When the fuse current is greater than a preset value, the connection between the magnetron module and the power source is disconnected.
The system according to claim 2, further comprising a cavity temperature controller, which is connected in series between any protection module and the power source for detecting the microwave heating The temperature in the device, and when the temperature in the microwave heating device is greater than the preset cavity temperature, the power supply of the magnetron module corresponding to any one of the protection modules and the controller is disconnected.
The system according to claim 1, wherein the magnetrons in the plurality of magnetron modules are respectively disposed on different sides in the microwave heating device.
A microwave oven, characterized in that the microwave oven comprises the system for controlling a microwave output according to any one of claims 1-9.
A method for controlling microwave output, characterized in that the method includes:

Receiving control instructions;

Find output powers of a plurality of magnetron modules corresponding to the control instruction;

Controlling the plurality of magnetron modules to output microwaves according to the output power.
The method according to claim 11, further comprising:

When it is detected that the door of the microwave heating device is opened, the plurality of magnetron modules are controlled to stop working.
The method according to claim 11, further comprising:

When it is detected that the door of the microwave heating device is opened, the monitoring switches connected in parallel to both ends of the magnetron module short-circuit the magnetron module;

And controlling the plurality of magnetron modules to stop working when a short-circuit current is detected.