CN111918436A

CN111918436A - Power output circuit and microwave heating equipment

Info

Publication number: CN111918436A
Application number: CN201910385492.3A
Authority: CN
Inventors: 张力潇; 俞国新; 丁剑波; 潘自杰; 叶世超; 沈兵
Original assignee: Qingdao Haier Co Ltd; Qingdao Haier Smart Technology R&D Co Ltd
Current assignee: Qingdao Haier Co Ltd; Qingdao Haier Smart Technology R&D Co Ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-11-10

Abstract

The application relates to a power output circuit, comprising: two or more circulators connected in a cascade; the two or more circulators include: a primary circulator and a final circulator; wherein the primary circulator is configured to transmit a power signal from a heated environment to a lower stage circulator; the last stage circulator configured to transmit the power signal to the heated environment. The embodiment of the disclosure realizes energy recycling of power signals, reduces energy consumption and improves energy utilization rate through a cascade connection structure of two or more circulators.

Description

Power output circuit and microwave heating equipment

Technical Field

The present application relates to the field of microwave technology, and for example, to a power output circuit and a microwave heating device.

Background

At present, with the development of semiconductor microwave ovens, increasing the power of microwave ovens is the key to increasing the heating speed of microwave ovens. During the use of the microwave oven, due to the impedance difference of the food to be heated in the heating cavity, the output impedance of the microwave transmitting module is mismatched, and serious energy loss is caused. In the related art, a circulator is used to feed the energy emitted from the heating chamber into the heating chamber again to improve the energy utilization.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

in the process of realizing energy reutilization by using the circulator, the problem of output impedance mismatch of the microwave transmitting module still exists due to different heating objects.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The disclosed embodiments provide a power output circuit.

In some embodiments, the power output circuit comprises: two or more circulators connected in a cascade; the two or more circulators include: a primary circulator and a final circulator;

wherein the primary circulator is configured to transmit a power signal from a heated environment to a lower stage circulator;

the last stage circulator configured to transmit the power signal to the heated environment.

The embodiment of the disclosure provides a microwave heating device.

In some embodiments, the microwave heating apparatus comprises the power output circuit described above.

Some technical solutions provided by the embodiments of the present disclosure can achieve the following technical effects:

the embodiment of the disclosure realizes energy recycling of power signals, reduces energy consumption and improves energy utilization rate through a cascade connection structure of two or more circulators.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic structural diagram of a power output circuit provided by an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a power output circuit provided by an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a power output circuit provided by an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a power output circuit provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a power output circuit provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a power output circuit provided by an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a power output circuit provided by an embodiment of the disclosure;

fig. 8 is a schematic structural diagram of a power output circuit provided by an embodiment of the present disclosure.

Reference numerals:

10: a circulator; 101: a circulator I; 102: a circulator II; 103 a circulator III; 20: a signal transmitting module; 30: a protection resistor; 40: a power detection module; a control module 50; 201: a microwave source; 202: a power amplifier; 203: a filter 203.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full ambit of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a structure, device or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present disclosure. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, and indirect connections via intermediary media, where the specific meaning of the terms is understood by those skilled in the art as appropriate.

Herein, the term "plurality" means two or more, unless otherwise specified.

Herein, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B represents: a or B.

Herein, the term "and/or" is an associative relationship describing objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

In the disclosed embodiments, the power signal propagates in the heating space to heat the article, often with an energy loss during the heating process. Wherein, when the heated object is mismatched with the impedance of the power signal transmitting module, the energy loss is huge. Most of the energy loss is due to the reflection of the power signal back to the power signal transmitting module and is consumed by the power signal transmitting module. When the energy of the power signal is large, the power signal transmitting module is damaged.

In the related art, a circulator is often used to change the transmission direction of a reflected power signal, so as to avoid the reflected power signal from being reflected back to a power signal transmitting module, and reduce the service life of the power signal transmitting module. Meanwhile, a resistor is connected to an output port of the circulator, and the reflected power signal is consumed. Although the influence of the reflected power signal on the power signal transmitting module is reduced, the energy consumed by the resistor is not reused, and the energy consumption is still large. The related art further provides a modification scheme, the resistance of the output port of the circulator is eliminated, and the power signal output by the output port of the circulator is output to the heating space, so that the reuse is realized. Although the scheme realizes energy reuse, the energy utilization rate is low due to neglecting the principle of impedance adaptation.

In the embodiment of the present disclosure, the power output circuit and the microwave heating device belong to the heating field, and optionally, the microwave heating device is a microwave oven, a defreezer or a dryer, etc. The circuit provided by the embodiment of the disclosure relates to a circulator. Wherein, the circulator is a device which makes the electromagnetic wave transmit in a unidirectional ring shape. The circulator 10, as described in fig. 1 of the present disclosure, includes port 1, port 2, and port 3. In the process of electromagnetic wave signal transmission, a signal input from the 1 port is output from the 2 port, and a signal input from the 2 port is output from the 3 port, so that the unidirectional annular transmission of electromagnetic waves is realized. In the present disclosure, the first port is port 1, the second port is port 2, and the third port is port 3.

The power output circuit provided by the embodiment of the disclosure includes: two or more circulators connected in a cascade. The two or more circulators include: a primary circulator and a final circulator.

Wherein the primary circulator is configured to transmit a power signal from a heated environment to a lower stage circulator.

Shown in fig. 2 and 3 are power output circuits according to exemplary embodiments.

As shown in fig. 2, the two circulators are included: circulator I101 and circulator II 102. Wherein, circulator I101 is as the primary circulator, and circulator II 102 is as the final circulator. A power signal from a heated environment is input to the circulator i 101 through the port 2 of the circulator i 101, and the circulator i 101 transmits the power signal to the circulator ii 102 of the lower stage through the port 3. Since two circulators are included in fig. 2, where circulator ii 102 is the final circulator, circulator ii 102 sends a power signal to the heated environment.

In some alternative embodiments, as shown in FIG. 3, three circulators are included: circulator I101, circulator II 102, and circulator III 103. In this case, circulator i 101 serves as a primary circulator, and circulator ii 102 serves as a final circulator. Circulator iii 103 acts as a mid-stage circulator.

A power signal from a heated environment is input to circulator i 101 through port 2 of circulator i 101, and circulator i 101 sends the power signal to circulator iii 103 of the next stage through port 3. Circulator II 102 acts as a final circulator, and circulator II 102 transmits a power signal to a heated environment.

Wherein the circulator III 103 as the middle-stage circulator is configured to transmit the power signal from the upper-stage circulator to the heated environment and transmit the power signal from the heated environment to the lower-stage circulator. That is, as shown in fig. 3, circulator iii 103 sends the power signal from circulator i 101 to the heated environment through port 2, and sends the power signal from the heated environment to the lower stage circulator ii 102 through port 3.

As shown in fig. 2 and 3, when three or more circulators 10 are included, wherein the middle stage circulators include two or more, as shown in fig. 2 and 3, they are connected in cascade with other circulators 10.

As shown in fig. 4, the power output circuit includes: circulator I101, circulator II 102 and signal transmission module 20. In some alternative embodiments, the power output circuit comprises more than two circulators, and the more than two circulators are connected in a cascade as described in the previous embodiments.

Wherein the signal transmitting module 20 is configured to transmit an initial power signal to the primary circulator. A primary circulator configured to input the initial power signal through a first port of the primary circulator and transmit the initial power signal to the heated environment through a second port of the primary circulator.

As shown in fig. 4, the power signal is input through port 1 of the primary circulator, i.e., circulator i 101, and is transmitted to the heated environment through port 2 of circulator i 101.

In some embodiments, as shown in fig. 5, the power output circuit includes: circulator I101, circulator II 102, signal transmitting module 20 and protective resistor 30. In some alternative embodiments, the power output circuit comprises more than two circulators, and the more than two circulators are connected in a cascade as described in the previous embodiments.

Wherein the protection resistor 30 is configured to receive a power signal from a heated environment transmitted by the last stage circulator. And the resistance value of the protection resistor is matched with the impedance value of the signal transmitting module so as to improve the energy utilization rate. The power signal from the heated environment is sent to the protection resistor 30, and the purpose is to consume the energy of the power signal through the protection resistor 30, so as to avoid the damage of the power output circuit caused by the excessive energy of the power signal.

A final stage circulator configured to input a power signal from a heated environment through a second port of the final stage circulator and transmit the power signal to the protection resistor 30 through a third port of the final stage circulator.

As shown in fig. 5, circulator ii 102 sends a power signal input through port 2 to protection resistor 30 through port 3.

In some embodiments, as shown in fig. 6, the power output circuit includes: the device comprises a circulator I101, a circulator II 102, a signal transmitting module 20, a protective resistor 30, a power detection module 40 and a control module 50. In some alternative embodiments, the power output circuit comprises more than two circulators, and the more than two circulators are connected in a cascade as described in the previous embodiments.

Wherein, the power detection module 40 is configured to obtain the output power of the initial power signal transmitted by the signal transmission module 20 and the reflected power of the power signal transmitted by the two or more circulator third ports.

A control module 50 configured to adjust a signal parameter of the initial power signal transmitted by the signal transmitting module 20 according to the output power and the reflected power.

In some embodiments, as shown in fig. 7, the signal transmitting module 20 includes: a microwave source 201 and a power amplifier 202.

Wherein, the microwave source 201 is configured to emit an initial signal.

A power amplifier 202 configured to amplify the power of the initial signal to obtain an initial power signal.

A control module 50 configured to adjust the amplification of the power amplifier to adjust the output power of the initial power signal.

In some embodiments, as shown in fig. 8, the signal transmitting module 20 includes: a microwave source 201 and a filter 203.

Wherein, the microwave source 201 is configured to emit an initial power signal.

A filter 203 configured to adjust a phase of the initial power signal.

A control module 50 configured to control the filter 203 to adjust the phase of the initial power signal.

Wherein the microwave source 201 is configured to emit a radio frequency of 300KHz to 3000 MHz. Optionally, the microwave source 201 is configured to emit a radio frequency of 300MHz to 3000 MHz.

The present disclosure also provides a microwave heating device comprising any of the power output circuits described above.

In some embodiments, the heated environment is surrounded by a side wall of the heating chamber of the microwave heating apparatus.

The present disclosure is not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A power output circuit, comprising: two or more circulators connected in a cascade; the two or more circulators include: a primary circulator and a final circulator;

2. The circuit of claim 1, wherein the two or more circulators further comprise: a middle stage circulator;

wherein the middle stage circulator is configured to transmit a power signal from an upper stage circulator to the heated environment and transmit a power signal from the heated environment to a lower stage circulator.

3. The circuit of claim 1 or 2, wherein any of the two or more circulators includes three ports;

wherein the primary circulator is configured to input a power signal from the heated environment through a second port of the primary circulator and transmit the power signal to a lower stage circulator through a third port of the primary circulator;

the last stage circulator is configured to input a power signal from a superior stage circulator through a first port of the last stage circulator and transmit the power signal to the heated environment through a second port of the last stage circulator.

4. The circuit of claim 1 or 2, further comprising:

a signal transmitting module configured to transmit an initial power signal to the primary circulator.

5. The circuit of any of claims 3 or 4, further comprising:

a protection resistor configured to receive a power signal from a heated environment transmitted by the final stage circulator,

and the resistance value of the protection resistor is matched with the impedance value of the signal transmitting module.

6. The circuit of claim 5, further comprising:

a power detection module configured to obtain an output power of the initial power signal transmitted by the signal transmission module and a reflected power of the power signals transmitted by the two or more circulator third ports;

a control module configured to adjust a signal parameter of an initial power signal transmitted by the signal transmission module according to the output power and the reflected power.

7. The circuit of claim 6, wherein the signal parameter comprises an output power;

the signal transmitting module includes:

a microwave source configured to emit an initial signal;

a power amplifier configured to amplify the power of the initial signal to obtain an initial power signal;

the control module is configured to adjust an amplification of the power amplifier to adjust an output power of the initial power signal.

8. The circuit of claim 6, wherein the signal parameter comprises a phase;

the signal transmitting module includes:

a microwave source configured to emit the initial power signal;

a filter configured to adjust a phase of the initial power signal;

the control module is configured to control the filter to adjust the phase of the initial power signal.

9. A microwave heating device comprising a power output circuit according to any one of claims 1 to 8.

10. The apparatus of claim 9 wherein said heated environment is surrounded by sidewalls of said microwave heating apparatus heating chamber.