CN112567888B - Method for operating a microwave device - Google Patents
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- CN112567888B CN112567888B CN201980051969.2A CN201980051969A CN112567888B CN 112567888 B CN112567888 B CN 112567888B CN 201980051969 A CN201980051969 A CN 201980051969A CN 112567888 B CN112567888 B CN 112567888B
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Abstract
The present invention relates to a method for operating a microwave device (1), the microwave device (1) comprising a cavity (2) and a plurality of microwave modules (3) for providing microwaves into said cavity (2), the method comprising the steps of: -providing a plurality of sets of operating parameters, each set of operating parameters being associated with a certain microwave module (3); -transmitting these sets of operating parameters simultaneously to the respective microwave modules (3) and synchronously applying them within the respective microwave modules (3) after receiving them; or uploading these sets of operating parameters to the respective microwave module (3) and applying the sets of operating parameters within the respective microwave module (3) after receiving the confirmation command or after expiry of a certain time period.
Description
The present invention generally relates to the field of microwave devices. More particularly, the present invention relates to a method for updating operating parameters of a plurality of microwave modules.
Background
Microwave devices, in particular microwave ovens, are well known in the art. The frequency of the microwaves used to heat food in a microwave oven is typically 2.45GHz.900MHz is an alternative frequency for heating food. The electromagnetic waves generate an oscillating magnetic field and an electric field to excite water molecules in the food, thereby generating heat.
In order to generate microwave frequency radiation, in conventional microwave ovens, a high voltage is applied to the magnetron. The microwaves are then transmitted through a waveguide to an enclosed cavity containing the load to be heated. The magnetron generates standing waves inside the cavity. Since the oscillation frequency is fixed, typically 2.45GHz, the energy mode inside the microwave oven is fixed. Therefore, the cooking results obtained are poor, since the standing waves cause so-called "hot and cold spots" inside the cavity. To overcome this problem and to be more uniform during cooking, microwave ovens contain additional solutions, such as microwave stirrers and turntables.
Microwave ovens using solid state technology introduce the ability to vary the frequency of oscillation and thus the standing waves and energy modes inside the cavity. Further control capability can be achieved using several microwave channels or modules to direct energy into the cavity through a transmitting device (antenna, waveguide adapter, etc.). The relative phase change between the active channels results in standing wave variations, thus having different node and antinode configurations and a more uniform energy spread inside the cavity and also within the food. In order to obtain said uniform energy distribution, the operating parameters of the microwave module must be changed from time to time.
Disadvantageously, when changing the operating parameters of a plurality of microwave modules, undefined intermediate states may occur, resulting in critical operating conditions.
Disclosure of Invention
It is an object of embodiments of the present invention to provide a method for operating a microwave arrangement comprising a plurality of microwave modules, which method ensures safe changes of operating parameters, thereby reducing the risk of critical operating conditions due to undesired intermediate states. This object is solved by the features of the present disclosure. The detailed description gives preferred embodiments. The embodiments of the present invention can be freely combined with each other if not explicitly stated otherwise.
According to one aspect, the present invention relates to a method for operating a microwave device. The microwave device comprises a cavity and a plurality of microwave modules for providing microwaves into said cavity. The method comprises the following steps:
providing a plurality of sets of operating parameters, each set of operating parameters being associated with a certain microwave module;
transmitting the sets of operating parameters simultaneously to the respective microwave modules and synchronously applying the sets of operating parameters within the respective microwave modules after receiving the sets of operating parameters;
or
These sets of operating parameters are uploaded to the respective microwave modules and applied within the respective microwave modules after receiving an acknowledgement command or after expiry of a certain time period (e.g. a certain number of clock oscillations).
The method is advantageous in that the take-over of operating parameters by the individual microwave modules may be synchronized or substantially synchronized, so that undefined intermediate states are reduced.
These operations provide the following technical advantages: transitions (where modules are not aligned with the desired operating point) minimize and thus avoid or minimize undefined states in which one module is operating with a previous parameter and the other module is operating with a new parameter, or vice versa. This situation may lead to destructive effects on the microwave module (channel) or to overstressing due to the fact that the energy that flows back in the microwave module in the non-authenticated state may leave the "safe operating area".
Another advantage of avoiding or minimizing transient states is that the cooking process is repeatable due to the fact that the module is operating under the required conditions and delivering the required amount of energy in the cavity with the desired energy distribution.
According to an embodiment, the set of operating parameters comprises frequency information, phase information, amplitude or amplification information, and/or on/off state information.
According to an embodiment, said uploading of the sets of operation parameters to the respective microwave modules is performed in a sequential manner. In other words, these operating parameters are uploaded to the microwave module one by one. Thus, for example, the upload operation may be performed using a serial communication line or a data bus.
According to an embodiment, the uploaded sets of operation parameters are cached in the respective microwave modules. Thus, the operating parameters may be stored in the microwave module as soon as a command for applying these operating parameters is received.
According to an embodiment, the confirmation command is transmitted via a serial communication channel or a data bus. Thus, the confirmation command may be, for example, a binary word reserved specifically for synchronization purposes.
According to an embodiment, the acknowledge command is transmitted via a trigger line or a synchronization line reserved for synchronization purposes. For example, the trigger line or synchronization line may be a dedicated line reserved for the transmission of acknowledgement commands or other synchronization information. The acknowledge command may be, for example, a change in voltage applied to a trigger line or a synchronization line. Thereby, a highly synchronized parameter change is obtained.
According to an embodiment, the confirmation command initiates a take over routine within two or more microwave modules, wherein one uploaded set of operation parameters is applied within one microwave module.
According to an embodiment, the transmission power of the microwave modules is decreased before applying the set of operation parameters and increased after applying the set of operation parameters. Thereby, a safe parameter change can be obtained.
According to an embodiment, the microwave arrangement comprises a master control entity and said master control entity receives information from one or more microwave modules, said information indicating that the microwave modules are ready to take over the set of operation parameters. Thereby, the reception of the operating parameter and preferably also the reduction of the transmission power by the respective microwave module can be monitored by the main control entity.
According to an embodiment, the microwave modules monitor channel reverse power at a reduced power level after applying the sets of operating parameters. Thereby, it may be determined whether the new set of operation parameters would result in a safe operating condition of the microwave device.
According to an embodiment, information about the reverse power of the channel is transmitted towards the master control entity. Thereby, the main control entity is able to monitor the channel reverse power of all microwave modules and can decide whether a safe operation condition is obtained when using the new set of operation parameters (channel reverse power below a certain threshold; total reverse power (sum of all channel reverse powers) below a certain threshold). This decision may be made based on a mathematical model or any other decision-making scheme.
According to an embodiment, the master control entity evaluates information about the channel reverse power from different microwave modules and initiates an increase of the output power of the respective microwave modules to a target output power when said evaluated information indicates that the channel reverse power of these microwave modules is below a certain threshold. Thereby, the main control entity is able to control the transmission power of the microwave device to increase to the nominal power.
According to another embodiment, the master control unit may directly apply the set of operating parameters known to satisfy the given operating condition without having to reduce power and perform parameter evaluations.
According to an embodiment, the master control unit initiates transmission of further sets of operation parameters to the microwave modules when the evaluated information indicates that at least one channel reverse power is above a certain threshold. Thus, if an unsafe operating condition occurs, the set of operating parameters may be rejected.
According to another aspect, the present invention relates to a microwave device. The microwave device comprises a cavity and a plurality of microwave modules for providing microwaves into said cavity. The microwave device further comprises a control entity configured to perform the steps of:
providing a plurality of sets of operating parameters, each set of operating parameters being associated with a certain microwave module;
transmitting these sets of operating parameters simultaneously to the respective microwave modules and applying them synchronously (e.g. after expiry of a certain time period or a certain number of clock oscillations) within the respective microwave modules after reception of the sets of parameters;
or alternatively
These sets of operating parameters are uploaded to the respective microwave modules and applied within the respective microwave modules after receiving an acknowledgement command or after expiry of a certain time period (e.g. a certain number of clock oscillations).
The term "set of operating parameters" may refer to a set comprising a single operating parameter or a plurality of operating parameters.
The term "substantially" or "approximately" as used in the present invention refers to a deviation from the exact value of +/-10%, preferably +/-5%, and/or in a variation that is not functionally significant.
Drawings
The various aspects of the invention, including its specific features and advantages, will be readily understood from the following detailed description and the accompanying drawings, in which:
FIG. 1 illustrates an example embodiment of a solid state microwave device having multiple microwave channels;
FIG. 2 illustrates an example embodiment of a microwave channel;
FIG. 3 shows a block diagram of a microwave device comprising a plurality of microwave channels; and
fig. 4 shows a block diagram illustrating method steps performed during updating of operating parameters of a plurality of microwave modules of a microwave device.
Detailed Description
The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments are shown. However, the present invention should not be construed as being limited to the embodiments set forth herein. Throughout the following description, similar reference numerals are used to denote similar elements, parts, articles or features, where applicable.
Fig. 1 shows a schematic view of a microwave device 1. The microwave device 1 may be a microwave oven for heating food. The microwave device 1 comprises a cavity 2. Microwaves may be generated within the cavity 2 by means of microwave modules, wherein each microwave module corresponds to one microwave channel CH1 to CH4. In the present embodiment, the microwave device 1 comprises four microwave channels and thus also four microwave modules. However, the number of microwave modules is merely an example, and the present invention should not be considered as being limited to such a number of microwave modules. More generally, the microwave arrangement 1 may comprise two or more microwave modules. As already mentioned before, the microwave device 1 may be of the solid state type, i.e. the microwave channel is adapted to vary the frequency of the supplied microwaves to change the energy pattern inside the cavity 2. Said frequency variation leads to a variation of the standing wave generated inside the cavity 2 and thus to a more uniform energy distribution inside the cavity 2 and therefore simultaneously inside the load to be heated by the microwaves.
Fig. 2 shows an exemplary embodiment of a microwave module 3, which is coupled to an antenna that provides microwaves generated by the microwave module 3 into the cavity 2. The microwave module 3 together with the antenna or waveguide may form a single microwave channel CH1 to CH4.
The microwave module 3 comprises a control unit 3.1 adapted to control the generation of microwaves. The control unit 3.1 may for example comprise a microcontroller. In more detail, the control unit 3.1 may be adapted to influence the frequency, phase and amplitude of the microwaves provided into the cavity 2. For example, the microwave module 3 may comprise a Voltage Controlled Oscillator (VCO) 3.2, which may comprise a Phase Locked Loop (PLL) and an attenuator to generate an HF signal having a certain frequency, phase and amplitude. In addition, the microwave generator 3 may comprise an amplifier 3.3 to adapt the electrical power of the HF-signal.
The control unit 3.1 may be operatively coupled with a Voltage Controlled Oscillator (VCO) 3.2 and an amplifier 3.3 to generate an HF signal with a certain frequency, phase and amplitude as required. The control unit 3.1 may be configured to receive a set of operating parameters and to generate an HF signal in accordance with said received operating parameters. The set of operating parameters may include, for example, frequency information, phase information, amplitude or amplification information, and/or on/off state information. The frequency information indicates a frequency of the microwave signal. The phase information may indicate a phase of the microwave signal (e.g., relative to a phase of the microwave signal of another microwave channel). The amplitude or amplification information may indicate the amplitude of the microwave signal or an amplification factor used within the microwave module. The on/off state information may indicate whether the corresponding microwave channel should be opened or closed.
The output of the amplifier 3.3 may be monitored by a monitoring entity 3.4. In more detail, the monitoring entity 3.4 may comprise a feedback loop providing a part of the output signal of the amplifier 3.3 back to the control unit 3.1 or another control entity in order to check whether the output of the amplifier 3.3 meets a given requirement.
The output of the amplifier 3.3 may be further coupled to a circulator 3.5. The circulator 3.5 may be adapted to forward the HF-signal provided by the amplifier 3.3 towards an antenna (not explicitly shown in fig. 2) comprised in the cavity 2. However, the circulator 3.5 is adapted to filter out reflected HF signals provided by the antenna back into the microwave module 3. In the present case, "filtering out" means that the reflected HF signal is prevented from travelling towards the amplifier 3.3, but is instead directed towards the electrical load 3.6 and/or the measurement system for measuring the reflected power. The electrical load 3.6 is adapted to consume/absorb the reflected HF-signal. The electrical load 3.6 may be coupled with the control unit 3.1 in order to monitor the electrical power of the consumed/absorbed reflected HF-signal.
Fig. 3 shows a schematic view of a microwave device 1 comprising four microwave modules 3 (respectively four microwave channels CH1 to CH 4). Each microwave channel CH1 to CH4 comprises a microwave module 3 as described above in connection with fig. 2. In addition, each microwave module 3 is coupled with an antenna 4 disposed inside the cavity 2. The microwave device 1 further comprises a main control entity 5 adapted to control the microwave channels CH1 to CH4, in particular the microwave modules 3 of the respective microwave channels CH1 to CH4, as further described below.
Each microwave module 3 may be associated with a set of operating parameters that may be selected to achieve a particular microwave transmission performance. For example, the frequency of the microwave supplied by the microwave generator 3 may be selected within a certain range (for example, within a range of 2.4GHz to 2.5 GHz). The step size may be 100kHz or any other step size. Preferably, all microwave channels CH1 to CH4 operate at the same frequency, i.e. if a change in the microwave frequency occurs, all channels change their frequency.
In addition, the phases of the microwaves provided by the microwave channels CH1 to CH4 may be changed. For example, one channel may form a reference channel, and the phase difference between the reference channel and the other microwave channels may be selected. The phase difference may be selected in the range of 0 ° to 359 °. The step size of the phase difference may be 1 ° or any other step size.
Furthermore, the electrical power of the microwaves provided by the respective microwave channels CH1 to CH4 may be another parameter to be selected. The electrical power may be selected in a range between 0% and 100%, where 0% is the power cut and 100% is the maximum power. The step size of the electrical power may be 1% or any other step size.
Another parameter may be the on/off state of the microwave channel.
In order to meet certain requirements, the set of operating parameters associated with a certain microwave module cannot be selected independently of the set of operating parameters associated with other microwave modules, since the set of operating parameters of said selected one microwave module interacts with the other microwave modules. In other words, the sets of operating parameters must match each other to meet certain requirements. A first requirement may be that the channel reverse power (the electrical power received at a certain antenna of the microwave channel and coupled back into the microwave module) is below a certain threshold value to avoid any damage at the microwave module. Another requirement may be that the total reverse power (i.e., the sum of all channel reverse powers) is below a certain threshold.
In order to obtain a uniform heating inside the cavity 2 without hot and cold spots, the operating parameters corresponding to a particular microwave module 3 (respectively microwave channel) may be frequently changed.
When changing the set of operating parameters in the microwave device 1 comprising a plurality of microwave channels CH1 to CH4, a plurality of intermediate states may occur. Each intermediate state is characterized in that the first group of microwave channels has changed their operating parameters, while the other group of microwave channels has not changed their operating parameters.
When changing the operating parameters within the microwave module, unreliable intermediate states may occur, in which the requirements cannot be guaranteed to be fulfilled, even if both the start state (the set of operating parameters used by the microwave module before the change) and the end state (the set of operating parameters used by the microwave module after all changes) are fulfilled.
In order to reduce the risk of any unreliable intermediate states, a method for avoiding undesired transient states during changes of operating parameters in a microwave device 1 is disclosed.
The general idea is to obtain a synchronized change of an operating parameter.
According to the first embodiment, the synchronized change of the operating parameters at the respective microwave modules 3 is obtained by simultaneously transmitting the set of operating parameters to the respective microwave modules 3. By "simultaneous transmission" is meant that the sets of operation parameters are not transmitted sequentially one after the other, but simultaneously. Thereby, the sets of operation parameters are received at the respective microwave modules 3 in a synchronized or quasi-synchronized manner. In addition, the microwave module 3 may be configured to apply the set of parameters immediately after reception. Thereby, the change of the operating parameters at the plurality of microwave modules 3 is obtained without or substantially without time delay and thus the risk of intermediate transient states is reduced. In another embodiment, the change of the parameter may occur after a certain time delay after receiving the new parameter, thereby achieving time synchronization, i.e. microwave generation using a clock.
According to a second embodiment, the change of the operating parameters at the respective microwave module is obtained by uploading the set of operating parameters to the respective microwave module. The uploads may be obtained in sequence. The uploaded sets of operation parameters may be cached in the respective microwave modules 3. After all operating parameters have been uploaded, a confirmation command is provided to the microwave module 3, which triggers the application of the operating parameters at the respective microwave module 3. Thus, in other words, the change of the operating parameter is performed only after receiving the confirmation command as the trigger information. The provision of the confirmation command may be initiated by the main control entity 5.
For transmitting the acknowledge command to the microwave module a data transmission line coupled to all microwave modules 3 may be used. The acknowledgement commands will arrive at the microwave module simultaneously or quasi-simultaneously (e.g. with a time delay of less than 10ms, preferably less than 5 ms). After receiving the confirmation command, the parameter sets cached in the storage device of the microwave module 3 may be applied.
The transmission of the confirmation command may be performed via a data bus or any other data connection between the microwave modules 3. The confirmation command may be, for example, a binary word which is interpreted by the respective microwave module 3 and triggers the take over of a new set of operating parameters.
According to other embodiments, the acknowledge command may be transmitted using a synchronization line or a trigger line. By using a synchronization line or a trigger line, the confirmation command may be, for example, a change in the voltage level on the line. Thereby, the synchronization of taking over a new set of operating parameters can be further improved.
To further improve safety during changes in operating parameters, the amplification of the microwave module may be reduced in order to reduce the transmission power during the parameter change period.
Fig. 4 shows an exemplary flowchart illustrating steps performed during a parameter change period.
The take over routine of the new set of operation parameters at the respective microwave module may be controlled by the main control entity 5 (see fig. 3). The main control entity 5 may be coupled with the microwave module 3 via a data transmission line.
In a first step, the master control entity 5 may initiate transmission of a plurality of sets of operation parameters to the microwave module 3, wherein each set is transmitted to a certain microwave module 3 (S10). The transmission of the operating parameters may be performed sequentially or at least partially in parallel. For example, the main control entity 5 may transmit the set of operation parameters to the target microwave module in order to assign a certain set to a certain microwave module 3.
After receiving the set of operation parameters at the microwave module 3, the microwave module 3 may take over the operation parameters in the buffer. Thereby, the microwave module 3 is ready to apply a new set of operation parameters.
After all sets of operating parameters have been received at the respective microwave module 3, the main control entity 5 transmits an acknowledgement command to the microwave module 3, as has been explained before (S11). Receipt of the confirmation command initiates take over of the operating parameters.
However, the microwave module 3 may optionally reduce the transmission power (S12) before taking over the operating parameters. For example, the transmit power may be reduced to a percentage value, e.g., 10% of the target transmit power. The reduction is obtained by reducing the amplification factor within the microwave module 3. The reduction of the transmission power may be triggered by the acknowledgement command itself or by a separate trigger for reducing the transmission power.
After the transmission power is reduced, the change of the operation parameter is performed (S13). Thus, each microwave module changes from a previously used operating parameter (e.g., a particular frequency, phase constellation) to a new operating parameter.
After changing the operating parameters, the microwave module 3 is driven based on the new set of operating parameters and the transmit power may optionally be increased to the target transmit power (S14). The target transmit power may be indicated by a power value or an amplification factor value included in the set of operating parameters.
During the above steps of reducing the transmission power, taking over the operating parameters and increasing the transmission power, one or more messages may be provided from the respective microwave module 3 to the main control entity 5. The message may be set according to a handshaking procedure. For example, after reducing the transmission power, a message may be sent from each microwave module 3 to the main control entity 5 to confirm that the microwave module 3 is ready for operation parameter updates. The main control entity 5 may send a confirmation command to the microwave modules 3 only if all microwave modules 3 have confirmed readiness. Thereby, the master control entity 5 is informed about the procedure currently performed by the respective microwave module 3.
Preferably, during powering of the microwave module 3 at a reduced power level, the microwave module 3 performs measurements on the channel reverse power. The measurement may be performed during operation of the microwave module 3 with the new set of operation parameters. The channel reverse power may be the power coupled back into the microwave module 3 due to electromagnetic waves received at the antenna of the microwave module 3. The microwave module 3 may transmit information about the channel reverse power to the main control entity 5. Thereby, the main control entity 5 is able to check whether the channel reverse power of all microwave modules 3 is below the threshold and thus also use the new set of operation parameters at the nominal transmit power (increased transmit power). If all microwave modules 3 show a channel reverse power below the threshold, the main control entity 5 may initiate an increase of the transmit power to the nominal/target transmit power. However, if the channel reverse power of one or more microwave modules 3 exceeds a threshold value, the new set of operation parameters cannot be used at the nominal/target transmit power and the master control entity 5 has to initiate transmission of the other set of operation parameters to the microwave module 3.
Thereby, secure operation using a plurality of different operation parameter sets can be ensured.
It should be noted that the description and drawings merely illustrate the principles of the proposed invention. Those skilled in the art will be able to implement various arrangements that embody the principles of the invention and are not explicitly described or illustrated herein.
List of reference numerals
1. Microwave device
2. Cavity body
3. Microwave module
3.1 Control unit
3.2 Voltage controlled oscillator
3.3 Amplifier with a high-frequency amplifier
3.4 Monitoring entity
3.5 Circulator
3.6 Electrical load
4. Antenna with a shield
5. Master control entity
CH1 to CH4 microwave channel
RP channel reverse power
Claims (14)
1. A method for operating a microwave device (1), the microwave device (1) comprising a cavity (2) and a plurality of microwave modules (3) for providing microwaves into the cavity (2), the method comprising the steps of:
-providing a plurality of sets of operating parameters, each set of operating parameters being associated with a certain microwave module (3);
-transmitting these sets of operating parameters synchronously to the respective microwave modules (3) and applying them within the respective microwave modules (3) immediately after receiving them;
or alternatively
Uploading these sets of operation parameters to the respective microwave module (3) and applying the sets of operation parameters within the respective microwave module (3) after receiving the confirmation command or after expiry of a certain time period.
2. The method of claim 1, wherein the set of operating parameters includes frequency information, phase information, amplitude or amplification information, and/or on/off state information.
3. The method according to claim 1 or 2, wherein uploading the sets of operation parameters to the respective microwave modules (3) is performed in a sequential manner.
4. The method according to claim 1 or 2, wherein the uploaded sets of operating parameters are cached in the respective microwave module (3).
5. The method according to claim 1 or 2, wherein the acknowledge command is transmitted via a serial communication channel or a data bus.
6. A method according to claim 1 or 2, wherein the acknowledge command is transmitted via a trigger line or a synchronization line reserved for synchronization purposes.
7. Method according to claim 1 or 2, wherein the confirmation command initiates a take over routine within two or more microwave modules (3), wherein an uploaded set of operation parameters is applied within one microwave module (3).
8. The method according to claim 1 or 2, wherein the transmission power of the microwave modules (3) is decreased before applying the set of operating parameters and the transmission power of the microwave modules (3) is increased after applying the set of operating parameters.
9. The method according to claim 1 or 2, wherein the microwave device (1) comprises a master control entity (5), and said master control entity (5) receives information from one or more microwave modules (3), said information indicating that the microwave modules (3) are ready to take over the sets of operation parameters.
10. The method according to claim 1, wherein the microwave modules (3) monitor channel reverse power at a reduced power level after applying the sets of operating parameters.
11. The method according to claim 10, wherein information about the channel reverse power is transmitted towards the master control entity (5).
12. Method according to claim 11, wherein the master control entity (5) evaluates information about channel reverse power from different microwave modules (3) and initiates an increase of the output power of the microwave modules (3) to a target output power when said evaluated information indicates that the channel reverse power value of the respective microwave modules (3) is below a certain threshold.
13. The method according to claim 11 or 12, wherein the master control entity (5) initiates transmission of further sets of operating parameters to the microwave modules (3) when the evaluated information indicates that at least one channel reverse power is above a certain threshold.
14. A microwave device comprising a cavity (2) and a plurality of microwave modules (3) for providing microwaves within said cavity (2), wherein the microwave device (1) comprises a main control entity (5), the main control entity (5) being configured to perform the steps of:
-providing a plurality of sets of operating parameters, each set of operating parameters being associated with a certain microwave module (3);
-transmitting these sets of operating parameters simultaneously to the respective microwave modules (3) and synchronously applying them within the respective microwave modules (3) after receiving them; or alternatively
These sets of operating parameters are uploaded to the respective microwave module (3) and applied within the respective microwave module (3) after reception of a confirmation command or after expiry of a certain time period.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP181891607 | 2018-08-15 | ||
| EP18091607 | 2018-08-15 | ||
| PCT/EP2019/069299 WO2020035251A1 (en) | 2018-08-15 | 2019-07-17 | Method for operating a microwave device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101743778A (en) * | 2007-07-13 | 2010-06-16 | 松下电器产业株式会社 | Microwave heating device |
| CN105230119A (en) * | 2013-05-21 | 2016-01-06 | 高知有限公司 | The calibration of RF treatment system |
| CN106322453A (en) * | 2016-09-12 | 2017-01-11 | 广东美的厨房电器制造有限公司 | Heating control method and heating control device for microwave oven and microwave oven |
| CN108076552A (en) * | 2016-11-18 | 2018-05-25 | 恩智浦美国有限公司 | RF pumping signal parameters are established in solid-state heating equipment |
-
2019
- 2019-07-17 CN CN201980051969.2A patent/CN112567888B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101743778A (en) * | 2007-07-13 | 2010-06-16 | 松下电器产业株式会社 | Microwave heating device |
| CN105230119A (en) * | 2013-05-21 | 2016-01-06 | 高知有限公司 | The calibration of RF treatment system |
| CN106322453A (en) * | 2016-09-12 | 2017-01-11 | 广东美的厨房电器制造有限公司 | Heating control method and heating control device for microwave oven and microwave oven |
| CN108076552A (en) * | 2016-11-18 | 2018-05-25 | 恩智浦美国有限公司 | RF pumping signal parameters are established in solid-state heating equipment |
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