CN115066049A

CN115066049A - Multi-channel microwave generating device based on phase control system and electronic equipment

Info

Publication number: CN115066049A
Application number: CN202210791010.6A
Authority: CN
Inventors: 刘荣军; 杨强; 赵瑞华; 赵灿; 陈君涛; 甄建宇; 朱安康
Original assignee: San Microelectronics Technology Suzhou Co ltd
Current assignee: San Microelectronics Technology Suzhou Co ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-09-16

Abstract

The application is suitable for the technical field of microwave heating, and provides a multi-channel microwave generating device and electronic equipment based on a phase control system. The device comprises: the frequency source is used for generating a microwave signal with preset parameters and is provided with at least two frequency source channels; at least two paths of adjusting circuits which are respectively connected with the at least two frequency source channels and used for adjusting the microwave signals emitted by the corresponding frequency source channels; the microprocessor is used for acquiring the first power of the transmitting signal and the second power of the reflected signal of each regulating circuit through the at least two regulating circuits and determining standing wave information of the heated object under the first working frequency and the first working phase; wherein the frequency source and the microprocessor are integrated in the same chip. The device can realize the adjustable parameter of the microwave signal and improve the heating efficiency of the heated object.

Description

Multi-channel microwave generating device based on phase control system and electronic equipment

Technical Field

The application belongs to the technical field of microwaves, and particularly relates to a multi-channel microwave generating device and electronic equipment based on a phase control system.

Background

The microwave oven is widely applied to the fields of microwave heating, drying and the like. Most of the traditional microwave ovens in industrial microwave heating and drying application adopt a magnetron as a microwave source, the working frequency of the traditional microwave oven mainly adopts 915MHz +/-15 MHz, and the whole machine power of the microwave oven is within the range of 10W-10 KW.

However, the magnetron needs a high-voltage device when working, the output power of the microwave oven adopting the magnetron depends on the anode voltage under the high-voltage condition, the control precision of the output power is poor, and the working frequency is fixed and unadjustable.

Disclosure of Invention

In view of this, the present application provides a multi-channel microwave generating device and an electronic apparatus based on a phase control system, which can achieve the adjustability of the working frequency, the working phase and the transmitting power, and improve the heating efficiency of the heated object.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, an embodiment of the present application provides a multi-channel microwave generating apparatus based on a phase control system, including:

the frequency source is used for generating a microwave signal with preset parameters and is provided with at least two frequency source channels;

at least two paths of adjusting circuits which are respectively connected with the at least two frequency source channels and used for adjusting the microwave signals emitted by the corresponding frequency source channels;

the microprocessor is used for acquiring the first power of the transmitting signal and the second power of the reflected signal of each regulating circuit through the at least two regulating circuits and determining standing wave information of the heated object under the first working frequency and the first working phase;

wherein the frequency source and the microprocessor are integrated in the same chip. The system is integrated in a chip, and the communication control circuit realizes interconnection inside and is not influenced by peripheral circuits. The chip size is small as a whole, and the chip cost and the packaging cost are relatively low

According to the multi-channel microwave generating device based on the phase control system, the control signal for controlling the frequency source is generated through the first power of the transmitting signal and the second power of the reflecting signal, the heated object is heated, so that the parameter adjustment of the microwave signal is realized, and the heating efficiency of the heated object can be improved.

The parameters of the microwave signal may include: frequency, phase and power.

With reference to the first aspect, in some embodiments, the chip is connected to an external reference signal, and the frequency source and the microprocessor are connected to the external reference signal through the chip.

With reference to the first aspect, in some embodiments, each path of adjusting circuit includes a power amplifying unit, a coupler, and a circulator, which are connected in sequence, where the coupler and the circulator are both used for the microprocessor to connect;

the coupler is used for acquiring first power of a transmitting signal of the current regulating circuit, and the circulator is used for acquiring second power of a reflecting signal of the current regulating circuit.

With reference to the first aspect, in some embodiments, the power amplification unit includes one power amplifier or a plurality of cascaded power amplifiers.

With reference to the first aspect, in some embodiments, the microprocessor is further configured to determine target operating parameters for heating the heated object according to the standing wave information, where the target operating parameters include a target operating frequency, a target operating phase, and a target emission power.

With reference to the first aspect, in some embodiments, the microprocessor is further configured to generate a control command according to the target operating parameter and send the control command to the frequency source;

the control finger comprises a frequency adjusting instruction, a first attenuation instruction and a second attenuation instruction, wherein the frequency adjusting instruction is used for adjusting the frequency of the frequency source output signal, the first attenuation instruction is used for performing first attenuation processing on the power of the frequency source output signal, and the second attenuation instruction is used for performing second attenuation processing on the power of the frequency source output signal; and the precision of the second attenuation processing is greater than that of the first attenuation processing.

With reference to the first aspect, in some embodiments, the frequency source includes a signal generation unit, a digitally controlled attenuator, and a power divider, which are connected in sequence, and a plurality of processing circuits respectively connected to the power divider; the signal generating unit, the numerical control attenuator, the power divider and each processing circuit form a frequency source channel;

the signal generating unit is used for generating a first power signal with a preset frequency, the numerical control attenuator is used for performing first attenuation processing on the first power signal to obtain a second power signal, and the power divider is used for dividing the second power signal into multiple paths of power signals which are in one-to-one correspondence with the processing circuits; each processing circuit in the multiple processing circuits is used for performing phase shift processing and second attenuation processing on the power signal transmitted by the power divider; wherein the accuracy of the second attenuation process is greater than the accuracy of the first attenuation process.

Illustratively, each of the processing circuits includes a digital phase shifter and an electrically tunable attenuator;

the digital phase shifter is used for performing phase shifting processing on the power signal transmitted by the power divider, and the electrically adjustable attenuator is used for performing second attenuation processing on the power signal subjected to the phase shifting processing; or,

the electrically-adjustable attenuator is used for performing the second attenuation processing on the power signal transmitted by the power divider, and the digital phase shifter is used for performing the phase shift processing on the power signal subjected to the second attenuation processing.

With reference to the first aspect, in some embodiments, the frequency source comprises a plurality of frequency source channels, each frequency source channel comprising a signal generation unit, a first attenuation unit, a phase shift unit, and a second attenuation unit;

the signal generating unit is configured to generate a first power signal with a preset frequency, the first attenuating unit is configured to perform first attenuation processing on the first power signal to obtain a second power signal, the phase shifting unit is configured to perform phase shifting processing on a received signal, and the second attenuating unit is configured to perform second attenuation processing on the received signal; wherein the accuracy of the second attenuation process is greater than the accuracy of the first attenuation process.

A second aspect of the embodiments of the present application provides an electronic apparatus including the multichannel microwave generating device of the above-described phase control system.

For example, the electronic device may be a microwave oven, an oven, or other devices capable of microwave heating.

A third aspect of the embodiments of the present application provides a microwave heating control method, including:

acquiring first power of a transmitting signal and second power of a reflected signal of each frequency source channel under a first working frequency and a first working phase in the process of heating a heated object by a microwave generating device;

according to the first power and the second power of each frequency source channel, determining standing wave information of the heated object at a first working frequency and a first working phase;

determining target working parameters for heating the heated object by the microwave generating device according to the standing wave information, wherein the target working parameters comprise target working frequency, target working phase and target transmitting power;

controlling the microwave generating device to heat the heated object according to the target working parameters.

According to the microwave heating control method, the target working parameters of the microwave generating device for heating the heated object are determined through the standing wave information, and the microwave generating device heats the heated object according to the target working parameters, so that the working frequency, the working phase and the emission power are adjustable, the heating efficiency of the heated object can be improved, and the control precision of the signal emission power is improved.

A fourth aspect of the embodiments of the present application provides a method for controlling accurate output of energy from a frequency source, including:

determining target emission power of the microwave generating device for heating the heated object according to the standing wave information;

and based on the target transmitting power, sending a first attenuation instruction to a numerical control attenuator in the frequency source, and sending a second attenuation instruction to an electric regulation attenuator in the frequency source.

According to the method for controlling the accurate output of the frequency source energy, a first attenuation instruction is sent to the numerical control attenuator according to the target transmitting power, a second attenuation instruction is sent to the electric regulation attenuator, the numerical control attenuator carries out first attenuation processing on the power of a signal according to the first attenuation instruction, the electric regulation attenuator carries out second attenuation processing on the power of the signal according to the second attenuation instruction, and the precision of the second attenuation processing is larger than that of the first attenuation processing, so that the precision of the frequency source energy output can be improved through the control over the numerical control attenuator and the electric regulation attenuator, and the actual power output by the frequency source is closer to or equal to the target transmitting power.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a multi-channel microwave generating device based on a phase control system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a multi-channel microwave generating device based on a phase control system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a first frequency source chip according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of another first frequency source chip provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a multi-channel microwave generating device based on a phase control system according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a multi-channel microwave generating device based on a phase control system according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a second frequency source chip according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of another second frequency source chip provided in an embodiment of the present application;

FIG. 9 is a flow chart of a microwave heating control method provided in an embodiment of the present application;

fig. 10 is a flowchart of a method for controlling an accurate output of energy from a frequency source according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

To make the objects, technical solutions and advantages of the present application more clear, the following description is made by way of specific embodiments with reference to the accompanying drawings.

Fig. 1 shows a schematic structural diagram of a microwave generating apparatus based on a phase control system according to an embodiment of the present application. Referring to fig. 1, the microwave generating apparatus may include a first frequency source chip 110, a first microprocessor 120, a first regulating circuit 130, and a second regulating circuit 140. It should be noted that, two paths of adjusting circuits are taken as an example in fig. 1, but not limited to this, and in other embodiments, more than three paths of adjusting circuits may also be included.

The first frequency source chip 110 may include at least two frequency source channels, and the microwave generating device will be described below by taking the example that the first frequency source chip 110 includes two frequency source channels (a first frequency source channel and a second frequency source channel). The first adjusting circuit 130 is connected to the first frequency source channel, and the second adjusting circuit 140 is connected to the second frequency source channel.

The first adjusting circuit 130 may include a first amplifying block, a first coupler, and a first circulator, which are connected in sequence, and the second adjusting circuit 140 may include a second amplifying block, a second coupler, and a second circulator, which are connected in sequence. The input end of the first amplification module is connected with the first frequency source channel, and the input end of the second amplification module is connected with the second frequency source channel. The output of the first circulator is connected to the output of the first adjusting circuit 130, and the output of the second circulator is connected to the output of the second adjusting circuit 140.

The first microprocessor 120 is connected to each of the at least two frequency source channels, and can control frequency stepping, phase shifting, and attenuation of each frequency source channel, thereby implementing heating control of the heated object.

For example, the first microprocessor 120 may perform forward power detection on the first regulating circuit 130 through the first coupler, perform reverse power detection on the first regulating circuit 130 through the first circulator, perform forward power detection on the second regulating circuit 140 through the second coupler, and perform reverse power detection on the second regulating circuit 140 through the second circulator, respectively. The first microprocessor 120 determines standing wave information of the object to be heated based on the detection result, and controls the first frequency source chip 110 such as frequency stepping, phase shift, attenuation, and the like based on the standing wave information.

The forward power may be the power information of the signal transmitted by the first adjusting circuit 130 or the power information of the signal transmitted by the second adjusting circuit 140. The reverse power may be information of the power of the signal reflected by the first adjusting circuit 130 or information of the power of the signal reflected by the second adjusting circuit 140.

Referring to fig. 2, the first adjusting circuit 130 may include a first power amplifying circuit 131, a second power amplifying circuit 132, a third power amplifying circuit 133, a first coupler 134, and a first circulator 135, which are connected in sequence. The first power amplification circuit 131, the second power amplification circuit 132, and the third power amplification circuit 133 constitute a power amplification unit of the first adjustment circuit 130.

The second adjusting circuit 140 may include a fourth power amplifying circuit 141, a fifth power amplifying circuit 142, a sixth power amplifying circuit 143, a second coupler 144, and a second circulator 145, which are connected in sequence. The fourth power amplification circuit 141, the fifth power amplification circuit 142, and the sixth power amplification circuit 143 constitute a power amplification unit of the second adjustment circuit 140.

A possible circuit structure of the first frequency source chip 110 is explained below.

First, the first circuit structure of the first frequency source chip 110

Referring to fig. 3, the first frequency source chip 110 may include: the first signal generating unit 1111, the first digital control attenuator 1112, the seventh power amplifying circuit 1113, the first power divider 1114, the first digital phase shifter 1115, the first electrical modulation attenuator 1116, the second digital phase shifter 1117 and the second electrical modulation attenuator 1118.

The first signal generating unit 1111, the first digitally controlled attenuator 1112, the seventh power amplifying circuit 1113, the first power divider 1114, the first digital phase shifter 1115 and the first electrically tunable attenuator 1116 form the first frequency source channel, such as channel 1 shown in fig. 3. The first signal generating unit 1111, the first digitally controlled attenuator 1112, the seventh power amplifying circuit 1113, the first power divider 1114, the second digital phase shifter 1117 and the second electrically controlled attenuator 1118 form the second frequency source channel, such as channel 2 shown in fig. 3.

The first output end of the first power divider 1114 is connected to the input end of the first digital phase shifter 1115, and the output end of the first digital phase shifter 1115 is connected to the input end of the first electrically tunable attenuator 1116. The output terminal of the first electrically tunable attenuator 1116 is connected to the first output terminal of the first frequency source chip 110.

The second output end of the first power divider 1114 is connected to the input end of the second digital phase shifter 1117, and the output end of the second digital phase shifter 1117 is connected to the input end of the second electrically tunable attenuator 1118. The output end of the second electrically tunable attenuator 1118 is connected to the second output end of the first frequency source chip 110.

Referring to fig. 3, the first frequency source chip 110 may further include a first SPI (Serial Peripheral Interface) Interface and a first voltage-controlled attenuation (VT) Interface. The first SPI interface is connected to the first signal generating unit 1111, and the first VT interface is connected to the first electrically tunable attenuator 1116 and the second electrically tunable attenuator 1118.

In this embodiment, the first SPI interface and the first VT interface are both used for connecting with the first microprocessor 120. Among them, the first microprocessor 120 may transmit a MISO (master receive slave) signal, a MOSI (master transmit slave receive) signal, an SCLK (internal system clock) signal, and an SSN (enable) signal to the first signal generation unit 1111 through the first SPI interface. First microprocessor 120 may control first electrically tunable attenuator 1116 and/or second electrically tunable attenuator 1118 via the first VT interface.

In addition, the first frequency source chip 110 may further include a first crystal oscillator interface and a first power interface. The first frequency source chip 110 may be connected to an external crystal oscillator through a first crystal oscillator interface, where the external crystal oscillator may be a 16MHz chip oscillator for industrial use. The first frequency source chip 110 may be connected to an external power source through a first power interface, and an LDO (low dropout regulator) may be built in the first frequency source chip 110. The LDO can convert an external power into 3.3V or 5V to supply power to various parts in the first frequency source chip 110.

An input end of the first signal generating unit 1111 is connected to an external crystal oscillator through a first crystal oscillator interface, and an output end of the first signal generating unit 1111 is connected to an input end of the first digitally controlled attenuator 1112. The output terminal of the first digitally controlled attenuator 1112 is connected to the input terminal of the first power divider 1114 through a seventh power amplifier circuit 1113.

In some embodiments, the first frequency source chip 110 may further include a first channel switch, an eighth power amplifier, a second channel switch, and a ninth power amplifier.

The first signal generating unit 1111, the first digital control attenuator 1112, the seventh power amplifying circuit 1113, the first power divider 1114, the first digital phase shifter 1115, the first electrically tunable attenuator 1116, the first channel switch, and the eighth power amplifier constitute the first frequency source channel. The output end of the first electrically tunable attenuator 1116 is connected to the input end of the eighth power amplifier circuit through the first channel switch, and the output end of the eighth power amplifier circuit is connected to the first output end of the first frequency source chip 110.

The first signal generating unit 1111, the first digitally controlled attenuator 1112, the seventh power amplifying circuit 1113, the first power divider 1114, the second digital phase shifter 1117, the second electrically controlled attenuator 1118, the second channel switch, and the ninth power amplifier form the second frequency source channel. The output end of the second electrically tunable attenuator 1118 is connected to the input end of the ninth power amplifier circuit through the second channel switch, and the output end of the ninth power amplifier circuit is connected to the second output end of the first frequency source chip 110.

Optionally, the first frequency source chip 110 may further be provided with a first channel switch (LVTTL) interface, and the first LVTTL interface is connected to the first channel switch and the second channel switch. The first LVTTL interface is used to connect with the first microprocessor 120. The first microprocessor 120 may send a control instruction to the first channel switch and the second channel switch through the first LVTTL interface, and control the first channel switch and/or the second channel switch to be turned on and turned off.

The first frequency source chip 110 receives a channel switch instruction sent by the first microprocessor 120 through the first LVTTL interface, and the first channel switch and the second channel switch respectively execute the channel switch instruction to control on/off of the respective frequency source channel.

Referring to fig. 2, the first programmable frequency source of the first frequency source chip 110 may include the first signal generation unit 1111, the first digitally controlled attenuator 1112, the seventh power amplification circuit 1113, the first power divider 1114, the first digital phase shifter 1115, the first channel switch, and the eighth power amplifier in fig. 3. The first ALC control unit may include first electrically tunable attenuator 1116 in fig. 3. The second programmable frequency source may include the first signal generating unit 1111, the first digitally controlled attenuator 1112, the seventh power amplifying circuit 1113, the first power divider 1114, the second digital phase shifter 1117, the second channel switch, and the ninth power amplifier in fig. 3. The second ALC control unit may include the second electrically tunable attenuator 1118 of fig. 3.

Second, second circuit structure of first frequency source chip 110

Referring to fig. 4, the first frequency source chip 110 may include a second signal generation unit 1131, a second digital attenuator 1132, a tenth power amplifier 1133, a third digital phase shifter 1134, and a third electrically tunable attenuator 1135, which are connected in sequence. The first frequency source chip 110 further includes a third signal generating unit 1141, a third digitally controlled attenuator 1142, a twelfth power amplifier 1143, a fourth digital phase shifter 1144 and a fourth electrically tunable attenuator 1145, which are connected in sequence.

Referring to fig. 4, the first frequency source chip 110 may further include a second SPI interface and a second VT interface. The second SPI interface is connected with the second signal generation unit 1131 and the third signal generation unit 1141, and the second VT interface is connected with the third electrically tunable attenuator 1135 and the fourth electrically tunable attenuator 1145.

In this embodiment, the second SPI interface and the second VT interface are both used for connecting with the first microprocessor 120. The first microprocessor 120 may transmit the MISO signal, the MOSI signal, the SCLK signal, and the SSN signal to the second signal generation unit 1131 and the third signal generation unit 1141 through the second SPI interface. The first microprocessor 120 may control the third electrically tunable attenuator 1135 and/or the fourth electrically tunable attenuator 1145 through the second VT interface.

In addition, the first frequency source chip 110 may further include a second crystal interface and a second power interface. The first frequency source chip 110 may be connected to an external crystal oscillator through a second crystal oscillator interface, where the external crystal oscillator may be a 16MHz chip oscillator for industrial use. First frequency source chip 110 may be connected to an external power source through a second power interface, and first frequency source chip 110 may have an LDO built therein. The LDO can convert an external power into 3.3V or 5V to supply power to various parts in the first frequency source chip 110.

The second signal generating unit 1131 and the third signal generating unit 1141 may be connected to an external crystal oscillator through a second crystal oscillator interface. For example, the second signal generating unit 1131 and the third signal generating unit 1141 may be connected to the same crystal oscillator, or may be connected to different crystal oscillators, which is not limited in this respect.

In some embodiments, the first frequency source chip 110 may further include a third channel switch, an eleventh power amplifier, a fourth channel switch, and a thirteenth power amplifier.

The first frequency source channel includes a second signal generating unit 1131, a second digital controlled attenuator 1132, a tenth power amplifier 1133, a third digital phase shifter 1134, a third electrically tunable attenuator 1135, a third channel switch, and an eleventh power amplifier, which are connected in sequence. The output end of the third electrically tunable attenuator 1135 is connected to the input end of the eleventh power amplifier through the third channel switch, and the output end of the eleventh power amplifier is connected to the first output end of the first frequency source chip 110.

The second frequency source channel includes a third signal generating unit 1141, a fourth digital controlled attenuator 1142, a twelfth power amplifier 1143, a fourth digital phase shifter 1144, a fourth electrically-tunable attenuator 1145, a fourth channel switch and a thirteenth power amplifier, which are connected in sequence. The output end of the fourth electrically tunable attenuator 1145 is connected to the input end of the thirteenth power amplifier through the fourth channel switch, and the output end of the thirteenth power amplifier is connected to the second output end of the frequency source chip 110.

Optionally, the first frequency source chip 110 may further be provided with a second channel switch (LVTTL) interface, where the second LVTTL interface is connected to the third channel switch and the fourth channel switch. The second LVTTL interface is used to connect with the first microprocessor 120. The first microprocessor 120 may send a control instruction to the third channel switch and the fourth channel switch through the second LVTTL interface, and control the third channel switch and/or the fourth channel switch to be turned on and turned off.

The first frequency source chip 110 receives the channel switch instruction sent by the first microprocessor 120 through the second LVTTL interface, and the third channel switch and the fourth channel switch respectively execute the channel switch instruction to control on/off of the respective frequency source channel.

Referring to fig. 2, the first programmable frequency source of the first frequency source chip 110 may include a second signal generation unit 1131, a second digital controlled attenuator 1132, a tenth power amplifier 1133, a third digital phase shifter 1134, a third channel switch, and an eleventh power amplifier. The first ALC control unit may include a third electrically tunable attenuator 1135. The second programmable frequency source may include a third signal generation unit 1141, a third digitally controlled attenuator 1142, a twelfth power amplifier 1143, a fourth digital phase shifter 1144, a fourth channel switch, and a thirteenth power amplifier. The second ALC control unit may include a fourth electrically tunable attenuator 1145.

In some embodiments, the first frequency source chip 110 may have three or more frequency source channels.

In some embodiments, the positional relationship of the digital phase shifter, the electrically tunable attenuator, and the channel switch may vary for each frequency source channel.

The first frequency source channel is taken as an example for explanation. For example, the tenth power amplifier 1133 is connected to the third electrically tunable attenuator 1135, the third digital phase shifter 1134, and the third channel switch in sequence. For another example, the tenth power amplifier 1133 is sequentially connected to the third channel switch, the third electrically tunable attenuator 1135, and the third digital phase shifter 1134. The eleventh power amplifier is located behind the third electrically-tuned attenuator 1135, and may amplify the attenuated signal.

The first microprocessor 120 has a plurality of inputs and outputs. The first microprocessor 120 has a first input connected to the first coupler 134, a second input connected to the first circulator 135, a third input connected to the second coupler 144, and a fourth input connected to the second circulator 145. A first output terminal of the first microprocessor 120 is connected to the SPI interface of the first frequency source chip 110, a second output terminal is connected to the LVTTL interface of the first frequency source chip 110, and a third output terminal is connected to the VT interface of the first frequency source chip 110.

According to the multi-channel microwave generating device with the phase control system, the control signal for controlling the frequency source is generated through the first power of the transmitting signal and the second power of the reflecting signal, and the heated object is heated, so that the parameter of the microwave signal can be adjusted, and the heating efficiency of the heated object can be improved.

And the target working parameters of the microwave generating device for heating the heated object are determined through the standing wave information, and the microwave generating device heats the heated object according to the target working parameters, so that the adjustment of the working frequency, the working phase and the emission power is realized, the heating efficiency of the heated object can be improved, and the control precision of the signal emission power is improved.

The operation of the multi-channel microwave generator of the phase control system is described below with reference to fig. 1 to 4 as an example:

first, the first microprocessor 120 sends an initial mode control command to the signal generating unit, the numerical control attenuator, the electrical tuning attenuator and the digital phase shifter in the first frequency source chip 110 through the SPI interface of the first frequency source chip 110, and the microwave generating device is turned on to operate. The initial mode control command is used to indicate the initial operating parameters of the microwave generating device, for example, the initial operating parameters may be an initial output power of 100W, an initial operating frequency of 2450MHz, and an initial phase of 0.

Then, the first microprocessor 120 acquires first power information of the transmission signal of the first adjusting circuit 130 through the first coupler 134, second power information of the reflection signal of the first adjusting circuit 130 through the first circulator 135, third power information of the transmission signal of the second adjusting circuit 140 through the second coupler 144, and fourth power information of the reflection signal of the second adjusting circuit 140 through the second circulator 145. The first microprocessor 120 determines the standing wave value of the heated object at the current operating frequency and the current phase according to the first to fourth power information.

The transmission signal is a signal projected by the first adjusting circuit 130 to the heated object, and the reflection signal is a signal reflected by the first adjusting circuit 130 after being projected to the heated object. Each path of regulating circuit corresponds to a standing wave value, and the standing wave values corresponding to different regulating circuits can be the same or different.

For example, for the first adjusting circuit 130, the first microprocessor 120 may determine the standing wave value corresponding to the first adjusting circuit 130 according to the first power information and the second power information. The first microprocessor 120 may determine the standing wave value corresponding to the first adjusting circuit 130 based on the difference between the first power information and the second power information. For example, the first microprocessor 120 calculates a difference between the first power information and the second power information, and performs a predetermined conversion on the difference to obtain a standing wave value corresponding to the first adjusting circuit 130.

For example, for the second adjusting circuit 140, the first microprocessor 120 may determine the standing wave value corresponding to the second adjusting circuit 140 according to the third power information and the fourth power information. The first microprocessor 120 may determine the standing wave value corresponding to the second adjusting circuit 140 based on a difference between the third power information and the fourth power information. For example, the first microprocessor 120 calculates a difference between the third power information and the fourth power information, and performs a predetermined conversion on the difference to obtain a standing wave value corresponding to the second adjusting circuit 140.

Then, based on the above method for determining the standing wave information of each adjusting circuit, the first microprocessor 120 performs an uninterrupted fast frequency sweep on the signal generating unit, performs an uninterrupted fast phase sweep on the digital phase shifter, and can determine the real-time variation of the standing wave value along with the frequency and phase of the microwave.

Then, the first microprocessor 120 determines the optimal operation mode of the microwave generating device according to the real-time variation of the standing wave value along with the frequency and phase of the microwave.

The optimal working mode of the microwave generating device comprises an optimal working frequency, an optimal working phase and an optimal transmitting power. The first microprocessor 120 may use the operating frequency, the operating phase, and the transmitting power corresponding to the minimum value of the standing wave value in a certain time period as the optimal operating frequency, the optimal operating phase, and the optimal transmitting power, respectively. Thereby, an optimal operation mode of the microwave generating device in the time period can be obtained.

Then, the channel switch is turned off, and the first microprocessor 120 is waited to send a new work instruction.

For example, for each working cycle of the microwave generating device, the first microprocessor 120 first determines the minimum value of the standing wave value in the current working cycle, and the corresponding working frequency, working phase and transmitting power are respectively used as the optimal working frequency, optimal working phase and optimal transmitting power. And taking the optimal working frequency, the optimal working phase and the optimal transmitting power as working parameters of the next working period.

Then, the first microprocessor 120 receives the working instruction according to the working instruction in the optimal working mode, and the signal generating unit, the numerical control attenuator, the electrically tunable attenuator and the digital phase shifter adjust the working parameters.

For example, the work instructions may include a frequency code instruction, an attenuation value instruction, and a voltage value instruction. The signal generating unit implements the precise adjustment of the frequency according to the frequency code command sent by the first microprocessor 120. The numerical control attenuator realizes the large-range adjustment of the output power according to the attenuation value instruction sent by the first microprocessor 120, and the electrically adjustable attenuator carries out the precise adjustment of the output power according to the voltage value instruction sent by the first microprocessor 120.

Finally, the first microprocessor 120 sends a channel switch closing instruction to the channel switch, the channel switch is closed in response to the channel switch closing instruction, and the microwave generating device starts to operate according to the optimal operating mode, thereby completing one operating cycle.

The channel switch closing instruction can be realized in a pulse instruction mode, and the channel switch is adjusted.

Fig. 5 is a schematic structural diagram illustrating a microwave generating apparatus based on a phase control system according to an embodiment of the present application. Referring to fig. 5, the microwave generating apparatus may include a second frequency source chip 210, a third regulating circuit 220, and a fourth regulating circuit 230. The second frequency source chip 210 includes a power source 211 and a second microprocessor 212, and the power source 211 and the second microprocessor 212 are integrally provided in one chip. It should be noted that fig. 5 illustrates a two-way adjusting circuit, but the invention is not limited thereto, and in other embodiments, the adjusting circuit may further include more than three ways.

The power source 211 may include at least two frequency source channels, and the microwave generating device is described below by taking the example that the frequency source 211 includes two frequency source channels (a third frequency source channel and a fourth frequency source channel). The third adjusting circuit 130 is connected to the third frequency source channel, and the fourth adjusting circuit 140 is connected to the fourth frequency source channel. For the structures of the third adjusting circuit 220 and the fourth adjusting circuit 230, please refer to the first adjusting circuit 130 and the second adjusting circuit 140, which are not described herein again.

The second microprocessor 212 is connected to each of the at least two frequency source channels, and can control the step, phase shift, and attenuation of the frequency of each frequency source channel, thereby controlling the heating of the object to be heated.

For example, the second microprocessor 212 may perform forward power detection on the third regulating circuit 220 through the third coupler, backward power detection on the third regulating circuit 220 through the third circulator, forward power detection on the fourth regulating circuit 230 through the fourth coupler, and backward power detection on the fourth regulating circuit 230 through the fourth circulator, respectively. The second microprocessor 212 determines standing wave information of the object to be heated based on the detection result, and controls the frequency source 211 such as frequency stepping, phase shifting, attenuation, and the like based on the standing wave information.

The forward power may be the power information of the signal transmitted by the third adjusting circuit 220 or the power information of the signal transmitted by the fourth adjusting circuit 230. The reverse power may be information on the power of the signal reflected by the second adjusting circuit 220 or information on the power of the signal reflected by the third adjusting circuit 230.

Referring to fig. 6, the third adjusting circuit 220 may include a fourteenth power amplifying circuit 221, a fifteenth power amplifying circuit 222, a sixteenth power amplifying circuit 223, a third coupler 224, and a third circulator 225, which are connected in sequence. Among them, the fourteenth power amplifying circuit 221, the fifteenth power amplifying circuit 222, and the sixteenth power amplifying circuit 223 constitute a power amplifying unit of the third adjusting circuit 220.

The fourth adjusting circuit 230 may include a seventeenth power amplifying circuit 231, an eighteenth power amplifying circuit 232, a nineteenth power amplifying circuit 233, a fourth coupler 234, and a fourth circulator 235, which are connected in sequence. Among them, the seventeenth power amplification circuit 231, the eighteenth power amplification circuit 232, and the nineteenth power amplification circuit 233 constitute a power amplification unit of the fourth adjustment circuit 230.

A possible circuit structure of the second frequency source chip 210 is explained below.

First circuit structure of first and second frequency source chips 210

Referring to fig. 7, the power source 211 may include: a fourth signal generating unit 2111, a fourth digitally controlled attenuator 2112, a twentieth power amplifying circuit 2113, a second power divider 2114, a fifth digital phase shifter 2115, a fifth electrically-tuned attenuator 2116, a sixth digital phase shifter 2117 and a sixth electrically-tuned attenuator 2118.

The fourth signal generating unit 2111, the fourth digitally controlled attenuator 2112, the twentieth power amplifying circuit 2113, the second power divider 2114, the fifth digital phase shifter 2115 and the fifth electrically controlled attenuator 2116 form the third frequency source channel. The fourth signal generating unit 2111, the fourth digitally controlled attenuator 2112, the twentieth power amplifying circuit 2113, the second power divider 2114, the sixth digital phase shifter 2117 and the sixth electrically controlled attenuator 2118 form the fourth frequency source channel.

A first output end of the second power divider 2114 is connected to an input end of a fifth digital phase shifter 2115, and an output end of the fifth digital phase shifter 2115 is connected to an input end of a fifth electrically tunable attenuator 2116. The output end of the fifth electrically tunable attenuator 2116 is connected to the first output end of the second frequency source chip 210.

A second output end of the second power divider 2114 is connected to an input end of a sixth digital phase shifter 2119, and an output end of the sixth digital phase shifter 2119 is connected to an input end of a sixth electrically tunable attenuator 2120. The output end of the sixth electrically tunable attenuator 2120 is connected to the second output end of the second frequency source chip 210.

Referring to fig. 7, the second frequency source chip 210 may further include a third oscillator interface and a third power interface. The second frequency source chip 210 may be connected to an external crystal oscillator through a third crystal oscillator interface, where the external crystal oscillator may be a 16MHz industrial patch crystal oscillator. The second frequency source chip 210 may be connected to an external power source through a third power interface, and the second frequency source chip 210 may have an LDO built therein. The LDO can convert an external power source into 3.3V or 5V to supply power to various parts in the second frequency source chip 210.

An input end of the fourth signal generation unit 2111 is connected to an external crystal oscillator through a third crystal oscillator interface, and an output end of the fourth signal generation unit 2111 is connected to an input end of the fourth digitally controlled attenuator 2112. An output end of the fourth digitally controlled attenuator 2112 is connected to an input end of the second power divider 2114 through a twentieth power amplification circuit 2113.

The frequency source chip in this embodiment has a third frequency source channel and a fourth frequency source channel, and can output two paths of signals through the third frequency source channel and the fourth frequency source channel.

Specifically, the fourth signal generating unit 2111, the fourth digitally controlled attenuator 2112, the twentieth power amplifier 2113, the second power divider 2114, the fifth digital phase shifter 2115 and the fifth electrically controlled attenuator 2116 form a third frequency source channel (channel 1 shown in fig. 7).

The fourth signal generation unit 2111, the fourth digitally controlled attenuator 2112, the twentieth power amplifier 2113, the second power divider 2114, the sixth digital phase shifter 2117 and the sixth electrically controlled attenuator 2118 form a fourth frequency source channel (channel 2 shown in fig. 7).

A second output end of the second power divider 1114 is connected to an input end of the sixth digital phase shifter 2117, and an output end of the sixth digital phase shifter 2117 is connected to an input end of the sixth electrically tunable attenuator 2118. An output end of the sixth electrically tunable attenuator 2118 is connected to a second output end of the second frequency source chip 110.

As shown in fig. 7, the second microprocessor 212 is connected to a fourth signal generating unit 2111, a fourth digitally controlled attenuator 2112, a fifth digital phase shifter 2115, a fifth electrically controlled attenuator 2116, a sixth digital phase shifter 2117 and an eighth electrically controlled attenuator 2118. The microprocessor 112 is used to control the signal generating unit 1111, the digital controlled attenuator 1112, and the digital phase shifter, the electrically controlled attenuator, and the channel switch of each processing circuit, so as to control the frequency, phase, and power of the output signal of the second frequency source chip 110.

The second microprocessor 212 is configured to send a frequency modulation instruction to the fourth signal generating unit 2111, send a first attenuation instruction to the fourth digitally controlled attenuator 2112, send a phase shift instruction to the fifth digital phase shifter 2115 and the sixth digital phase shifter 2117, and send a second attenuation instruction to the fifth electrically tunable attenuator 2116 and the sixth electrically tunable attenuator 2118, respectively.

The fourth signal generating unit 2111 executes the frequency modulation instruction to adjust the frequency of the first power signal. The fourth digitally controlled attenuator 2112 performs attenuation processing on the first power signal in accordance with the first attenuation instruction. The fifth digital phase shifter 2115 performs a phase shift process on the power signal transmitted by the second power divider 2114 according to the phase shift instruction, and the sixth digital phase shifter 2117 performs a phase shift process on the power signal transmitted by the second power divider 2114 according to the phase shift instruction. The fifth electrically tunable attenuator 2116 attenuates the power signal transmitted by the second power divider 2114 according to the second attenuation instruction, and the second electrically tunable attenuator 1118 attenuates the power signal transmitted by the second power divider 2114 according to the second attenuation instruction.

Referring to fig. 7, the second frequency source chip 210 may also be provided with a crystal oscillator interface and a power interface. The fourth signal generating unit 2111 may be connected to an external crystal oscillator through a crystal oscillator interface, where the external crystal oscillator may be a 16MHz chip oscillator for industrial use. The frequency source chip 110 may be connected to an external power source through a power interface, and the second frequency source chip 210 may have an LDO (low dropout regulator) built therein. The LDO can convert an external power source into 3.3V or 5V to supply power to various parts in the second frequency source chip 210.

The input end of the fourth signal generating unit 2111 is connected to an external crystal oscillator through a crystal oscillator interface, and the output end of the signal generating unit 1111 is connected to the input end of the digital control attenuator 1112. The output terminal of the fourth digitally controlled attenuator 2112 is connected to the input terminal of the second power divider 2114 via a twentieth power amplifier 2113.

In some embodiments, the second frequency source chip 210 may also be provided with a communication interface (not shown). The second microprocessor 212 can be communicatively connected to an external terminal via the communication interface. The user can control the operating state of the second frequency source chip 210 through the external terminal, and know the real-time parameters of the second frequency source chip 210, etc.

For example, the operating frequency of the second frequency source chip 210 may be 915MHz ± 15MHz, 2450MHz ± 50MHz, 433MHz, or other frequencies, which is not limited in this respect. The power of the microwave oven to which the second frequency source chip 210 of the embodiment of the present application is applied may be 10W to 1 KW.

In some embodiments, the frequency source chip 110 may further include a fifth channel switch, a twenty-first power amplifier, a sixth channel switch, and a twenty-second power amplifier.

The fourth signal generating unit 2111, the fourth digitally controlled attenuator 2112, the twentieth power amplifying circuit 2113, the second power divider 2114, the fifth digital phase shifter 2115, the fifth electrically tunable attenuator 2116, the fifth channel switch, the twenty-first power amplifier, the sixth digital phase shifter 2117, the sixth electrically tunable attenuator 2118, the sixth channel switch, and the twenty-second power amplifier constitute the frequency source 211 of the second frequency source chip 210.

A fourth signal generating unit 2111, a fourth digitally controlled attenuator 2112, a twentieth power amplifying circuit 2113, a second power divider 2114, a fifth digital phase shifter 2115, a fifth electrically-controlled attenuator 2116, a fifth channel switch and a twenty-first power amplifier form a third frequency source channel. An output end of the fifth electrically-tunable attenuator 2116 is connected to an input end of the twenty-first power amplifier through the fifth channel switch, and an output end of the twenty-first power amplifier is connected to the first output end of the second frequency source chip 210.

A fourth frequency source channel is formed by the fourth signal generating unit 2111, the fourth digitally controlled attenuator 2112, the twentieth power amplifying circuit 2113, the second power divider 2114, the sixth digital phase shifter 2117, the sixth electrically controlled attenuator 2118, the sixth channel switch and the twenty-second power amplifier. An output end of the sixth electrically-tunable attenuator 2118 is connected to an input end of a twenty-second power amplifier through a sixth channel switch, and an output end of the twenty-second power amplifier is connected to a second output end of the second frequency source chip 210.

In addition, the second microprocessor 212 is also connected to a fifth channel switch and a sixth channel switch, respectively. The second microprocessor 212 is configured to send channel switch commands to the fifth channel switch and the sixth channel switch, respectively. And the fifth channel switch and the sixth channel switch respectively execute channel switch instructions to control the on-off of respective frequency source channels.

It should be noted that the circuit structure shown in fig. 7 is only one example of the second frequency source chip 210, and the embodiment of the present application is not limited thereto.

In some embodiments, the second frequency source chip 210 may have three or more frequency source channels.

In some embodiments, the positional relationship of the fifth digital phase shifter 2115, the fifth electrically tunable attenuator 2116 and the fifth channel may vary. For example, the second power divider 2114 is connected to the fifth electrically tunable attenuator 2116, the fifth digital phase shifter 2115 and the fifth channel switch in sequence. For another example, the second power divider 2114 is sequentially connected to the fifth channel switch, the fifth electrically tunable attenuator 2116, and the fifth digital phase shifter 2115. The twenty-first power amplifier is located behind the fifth electrically-tuned attenuator 2116, and can amplify the attenuated signal.

Second circuit structure of second and third frequency source chips 210

Referring to fig. 8, the second frequency source chip 210 may include a second microprocessor 212 and a frequency source (not shown). The frequency source includes a third frequency source channel (channel 1 shown in fig. 8) and a fourth frequency source channel (channel 2 shown in fig. 8). Through the third frequency source channel and the fourth frequency source channel, the second frequency source chip 210 can output two signals.

Specifically, the second frequency source chip 210 may include a fifth signal generation unit 2131, a fifth digitally controlled attenuator 2132, a twenty-third power amplification circuit 2133, a seventh digital phase shifter 2134, and a seventh electrically controlled attenuator 2135, which are connected in sequence. The second frequency source chip 210 further includes a sixth signal generating unit 2141, a sixth digitally controlled attenuator 2142, a twenty-fifth power amplifying circuit 2143, an eighth digital phase shifter 2144, and an eighth electrically tunable attenuator 2145, which are connected in sequence.

The third frequency source channel includes a fifth signal generation unit 2131, a fifth digitally controlled attenuator 2132, a twenty-third power amplifier 2133, a seventh digital phase shifter 2134 and a seventh electrically controlled attenuator 2135, which are connected in sequence.

The fourth frequency source channel includes a sixth signal generating unit 2141, a sixth digitally controlled attenuator 2142, a twenty-fifth power amplifier 2143, an eighth digital phase shifter 2144, and an eighth electrically tunable attenuator 2145, which are connected in sequence.

Specifically, an output end of the fifth signal generation unit 2131 is connected to an input end of a fifth digitally controlled attenuator 2132, an output end of the fifth digitally controlled attenuator 2132 is connected to an input end of a seventh digital phase shifter 2134 through a thirteenth power amplifier 2133, an output end of the seventh digital phase shifter 2134 is connected to an input end of a seventh electrically tunable attenuator 2135, and an output end of the seventh electrically tunable attenuator 2135 is connected to a first output end of the second frequency source chip 210.

An output end of the sixth signal generating unit 2141 is connected to an input end of the sixth digitally controlled attenuator 2142, an output end of the sixth digitally controlled attenuator 2142 is connected to an input end of the eighth digital phase shifter 2144 through a twenty-fifth power amplifier 2143, an output end of the eighth digital phase shifter 2144 is connected to an input end of the eighth electrically tunable attenuator 2145, and an output end of the eighth electrically tunable attenuator 2145 is connected to a second output end of the second frequency source chip 210.

The second microprocessor 212 is connected with the signal generating unit, the numerical control attenuator, the digital phase shifter and the electrically-tuned attenuator of each frequency source channel. The second microprocessor 112 is used for controlling the signal generating unit, the numerical control attenuator, the digital phase shifter and the electrically-tuned attenuator so as to control the frequency, the phase and the power of the output signal of the second frequency source chip 210.

As shown in fig. 8, the second microprocessor 212 is connected to the fifth signal generating unit 2131, the fifth digitally controlled attenuator 2132, the seventh digital phase shifter 2134, the seventh electrically controlled attenuator 2135, the sixth signal generating unit 2141, the sixth digitally controlled attenuator 2142, the eighth digital phase shifter 2144 and the eighth electrically controlled attenuator 2145.

The second microprocessor 212 is configured to send a frequency modulation instruction to the fifth signal generation unit 2131 and the sixth signal generation unit 2141, send a third attenuation instruction to the fifth numerical control attenuator 2132 and the sixth numerical control attenuator 2142, send a phase shift instruction to the seventh digital phase shifter 2134 and the eighth digital phase shifter 2144, and send a fourth attenuation instruction to the seventh electrical attenuator 2135 and the eighth electrical attenuator 2145, respectively.

The fifth signal generating unit 2131 and the sixth signal generating unit 2141 execute a frequency modulation command to adjust the frequency of the respective first power signal. The fifth digitally controlled attenuator 2132 and the sixth digitally controlled attenuator 2142 perform attenuation processing on the respective first power signals according to the third attenuation instruction, respectively. The seventh digital phase shifter 2134 performs phase shifting on the received power signal according to the phase shifting instruction, and the eighth digital phase shifter 2144 performs phase shifting on the received power signal according to the phase shifting instruction. The seventh electrically adjustable attenuator 2135 attenuates the received power signal according to the fourth attenuation instruction, and the eighth electrically adjustable attenuator 2145 attenuates the received power signal according to the fourth attenuation instruction.

Referring to fig. 8, the second frequency source chip 210 may further include a fourth crystal oscillator interface and a fourth power interface. The second frequency source chip 210 may be connected to an external crystal oscillator through a fourth crystal oscillator interface, where the external crystal oscillator may be a 16MHz industrial patch crystal oscillator. The second frequency source chip 210 may be connected to an external power source through a fourth power interface, and the second frequency source chip 210 may have an LDO built therein. The LDO can convert an external power source into 3.3V or 5V to supply power to various parts in the second frequency source chip 210.

The fifth signal generating unit 2131 and the sixth signal generating unit 2141 may both be connected to an external crystal oscillator through a fourth crystal oscillator interface. For example, the fifth signal generating unit 2131 and the sixth signal generating unit 2141 may be connected to the same crystal oscillator, or may be connected to different crystal oscillators, which is not limited thereto.

The second microprocessor 212 has a plurality of inputs and outputs. The second microprocessor 212 has a first input connected to the third coupler 224, a second input connected to the third circulator 225, a third input connected to the fourth coupler 234, and a fourth input connected to the fourth circulator 245. The output of the second microprocessor 212 is connected to a frequency source 211. Specifically, the output end of the second microprocessor 212 is connected to the signal generating unit, the digital control attenuator, the digital phase shifter, and the electrically tunable attenuator in the second frequency source chip 210, respectively.

In some embodiments, the second frequency source chip 210 may further include a seventh channel switch, a twenty-fourth power amplifier, an eighth channel switch, and a twenty-fifth power amplifier.

The third frequency source channel includes a fifth signal generating unit 2131, a fifth digital controlled attenuator 2132, a twenty-third power amplifying circuit 2133, a seventh digital phase shifter 2134, a seventh electrical attenuator 2135, a seventh channel switch and a twenty-fourth power amplifier, which are connected in sequence. An output end of the seventh electrically tunable attenuator 2135 is connected to an input end of a twenty-fourth power amplifier through a seventh channel switch, and an output end of the twenty-fourth power amplifier is connected to the first output end of the second frequency source chip 210.

The fourth frequency source channel includes a sixth signal generating unit 2141, a sixth digitally controlled attenuator 2142, a twenty-fifth power amplifying circuit 2143, an eighth digital phase shifter 2144, an eighth electrically tunable attenuator 2145, an eighth channel switch, and a twenty-sixth power amplifier, which are connected in sequence. The output end of the eighth electrically tunable attenuator 2145 is connected to the input end of the twenty-sixth power amplifier through the eighth channel switch, and the output end of the twenty-sixth power amplifier is connected to the second output end of the second frequency source chip 110.

In addition, the second microprocessor 212 is also connected to a seventh channel switch and an eighth channel switch, respectively. The second microprocessor 212 is configured to send channel switch commands to the seventh channel switch and the eighth channel switch, respectively. And the seventh channel switch and the eighth channel switch respectively execute channel switch instructions to control the on-off of respective frequency source channels.

For the working process of the microwave generating device shown in fig. 5 to 8, please refer to the working process of the microwave generating device shown in fig. 1 to 4, which is not described herein again.

Illustratively, the parameters of each digitally controlled attenuator are as follows: the attenuation range is 0-30 dB, the stepping is 1dB, and the attenuation precision is +/-0.5 dB. The parameters of each electrically-adjusted attenuator are as follows: the attenuation range is 0-30 dB, the continuous adjustable effect is achieved, and the working voltage is 0-3.3V. The parameters of the digital phase shifters are as follows: 0-360 degrees, 1.4 degrees of stepping and less than or equal to 2 degrees of phase shifting precision. The parameters of the above-mentioned channel switches are as follows: the degree of turn-off is 60dB, and the response time is within 150 ms.

Based on the microwave generating device, the embodiment of the application also provides a microwave heating control method. Referring to fig. 9, the microwave heating control method includes steps 301 to 304.

Step 301, in the process of heating the heated object by the microwave generating device, acquiring a first power of the transmitting signal and a second power of the reflected signal of each frequency source channel under the first working frequency and the first working phase.

The microwave generating device can have two or more frequency source channels, and each frequency source channel can generate a transmitting signal with a set frequency, a set phase and a set power. The signals generated by the frequency source channels are transmitted to the heated object through corresponding regulating circuits, the heated object can transmit the signals, and the regulating circuits can acquire the signals transmitted back by the heated object. Therefore, the transmission signal is a signal projected onto the heating object by the adjusting circuit, and the reflection signal is a signal reflected back after the adjusting circuit is projected onto the heating object.

For example, a first power of the transmission signal of each adjusting circuit may be obtained through the coupler of each adjusting circuit, and a second power of the reflection signal of each adjusting circuit may be obtained through the circulator of each adjusting circuit.

It should be noted that the first power of each frequency source channel may be the same or different, and the second power of each frequency source channel may be the same or different.

For example, the first operating frequency may be an operating frequency at a first time, the first operating phase may be an operating phase at the first time, and the first time may be any time. For example, the first time may be an initial time at which the microwave generating device starts to operate. At this time, the first operating frequency and the first operating phase may be an initial operating frequency and an initial phase corresponding to an initial operating parameter set by a user. For example, the initial operating frequency may be 2450MHz and the initial phase may be 0. For another example, the first time may be any time during the operation of the microwave generating device.

Step 302, according to the first power and the second power of each frequency source channel, determining standing wave information of the heated object under the first working frequency and the first working phase.

When a microwave signal is transmitted from one medium (e.g., an antenna of a microwave generating device) to another medium (e.g., an object to be heated), energy of the microwave signal is partially reflected due to the difference between the two media, and the reflected microwave is a standing wave.

In some embodiments, step 302 may include: and for each frequency source channel, determining standing wave information corresponding to the frequency source channel according to the first power and the second power. Wherein the standing wave value corresponding to each frequency source channel can be determined based on a difference between the first power and the second power. For example, a difference between the first power and the second power is calculated, and then the difference is subjected to preset conversion to obtain a standing wave value corresponding to each frequency source channel.

In this embodiment, each frequency source channel corresponds to one standing wave information, and the standing wave information of each frequency source channel may be the same or different. And respectively controlling the working states of the corresponding frequency source channels according to the standing wave information of each frequency source channel.

Step 303, determining target operating parameters for heating the heated object by the microwave generating device according to the standing wave information, wherein the target operating parameters comprise target operating frequency, target operating phase and target transmitting power.

The target operating parameters may be operating parameters corresponding to an optimal operating mode of the microwave generating device, and may include, for example, an optimal operating frequency, an optimal operating phase, and an optimal transmitting power. In the optimal working mode, each frequency source channel works under the respective optimal working frequency, optimal working phase and optimal transmitting power, and the heating efficiency of the microwave generating device to the heated object is the highest.

In some embodiments, the operating frequency of the microwave corresponding to the minimum value of the standing wave value in a certain time period may be used as a target operating frequency, the operating phase of the microwave corresponding to the minimum value of the standing wave value may be used as a target operating phase, and the transmitting power of the microwave corresponding to the minimum value of the standing wave value may be used as a target transmitting frequency. Thereby, an optimal operation mode of the microwave generating device in the time period can be obtained.

And step 304, controlling the microwave generating device to heat the heated object according to the target operating parameters.

For example, a microprocessor of the microwave generating device may generate a control instruction according to a target operating parameter, and a signal generating unit, a numerical control attenuator, an electrical tuning attenuator, and a digital phase shifter in a frequency source chip of the microwave generating device receive the operating instruction, and adjust the operating parameter of the microwave generating device to the target operating parameter or to approach the target operating parameter. The microwave generator heats the object to be heated according to the target operating frequency, the target operating phase, and the target emission frequency determined in step 303.

For example, the control instructions may include a frequency adjustment instruction, a first attenuation instruction, and a second attenuation instruction. For example, the frequency adjustment command may be a frequency code command, the first attenuation command may be an attenuation value command, and the second attenuation command may be a voltage value command. And the signal generating unit realizes the accurate adjustment of the working frequency of the signal according to the frequency adjusting instruction. The numerical control attenuator adjusts the power of the signal in a large range according to the first attenuation instruction, and the electric-tuning attenuator precisely adjusts the power of the signal according to the second attenuation instruction.

In some embodiments, the frequency code instructions may be generated based on the target operating frequency and the current operating frequency. A phase value command may be generated based on the target operating phase and the current operating phase. The attenuation value command and the voltage value command may be generated based on the target transmit power and the current transmit power.

For convenience of description, the adjustment of the signal by the digitally controlled attenuator is referred to as a first attenuation process, and the adjustment of the signal by the electrically adjusted attenuator is referred to as a second attenuation process. The first attenuation processing can be desaturation attenuation of the signal; the second attenuation process may be a more accurate attenuation after the signal is de-guaranteed and attenuated.

Specifically, the first attenuation process may be implemented by performing a large-amplitude attenuation (also referred to as a coarse attenuation) on the signal by using a numerical control attenuator, and the second attenuation process may be implemented by performing a small-amplitude attenuation (also referred to as a precise attenuation) on the signal by using an electrically adjustable attenuator. The signal is firstly attenuated to gain unsaturation through the numerical control attenuator, and then the signal is attenuated to a set value through second attenuation processing.

It is understood that the signal gain is linear to a certain degree, but when the signal gain is increased to a certain degree, the signal gain tends to be saturated or even decreased. Therefore, the numerical control attenuator can be adopted to firstly attenuate the signal to the saturation (namely, the desaturation attenuation) and then carry out the second attenuation processing with higher precision to attenuate to the set value, thereby improving the accuracy and the efficiency of the attenuation.

Optionally, the control instructions may also include channel switch instructions. And the channel switch of each frequency source channel realizes the control of the opening and/or the breaking of the corresponding frequency source channel according to the channel switch instruction. For example, the channel switch closing command may be implemented in the form of a pulse command.

According to the microwave heating control method, in the process that the microwave generating device heats the heated object, the first power of the transmitting signal and the second power of the reflecting signal of each frequency source channel under the first working frequency and the first working phase are obtained. Then, according to the first power and the second power of each frequency source channel, the standing wave information of the heated object under the first working frequency and the first working phase is determined. And determining target working parameters of the microwave generating device for heating the heated object according to the standing wave information, wherein the target working parameters comprise a target working frequency, a target working phase and a target transmitting power. And finally, controlling a frequency source of the microwave generating device to heat the heated object according to the target working parameters.

Based on the microwave generating device, the embodiment of the application also provides a method for controlling the energy of the frequency source to be accurately output. Referring to fig. 10, the above method for controlling the precise output of the energy of the frequency source may include steps 401 to 404.

Step 401, in the process that the microwave generating device heats the heated object, acquiring a first power of the emission signal and a second power of the reflection signal of each frequency source channel under a first working frequency and a first working phase.

Step 402, according to the first power and the second power of each frequency source channel, determining standing wave information of the heated object under the first working frequency and the first working phase.

In some embodiments, step 402 may comprise: and for each frequency source channel, determining standing wave information corresponding to the frequency source channel according to the first power and the second power. Wherein the standing wave value corresponding to each frequency source channel can be determined based on a difference between the first power and the second power. For example, a difference between the first power and the second power is calculated, and then the difference is subjected to preset conversion to obtain a standing wave value corresponding to each frequency source channel.

Step 403, determining the target emission power of the microwave generator for heating the object to be heated according to the standing wave information.

The target transmission power may be a transmission power corresponding to an optimal operation mode of the microwave generating device, for example, the target transmission power may be an optimal transmission power. In the optimal working mode, each frequency source channel works under the respective optimal working frequency, optimal working phase and optimal transmitting power, and the heating efficiency of the microwave generating device to the heated object is the highest.

In some embodiments, the operating frequency of the microwave corresponding to the minimum value of the standing wave value in a certain time period may be taken as the target operating frequency, the operating phase of the microwave corresponding to the minimum value of the standing wave value may be taken as the target operating phase, and the transmitting power of the microwave corresponding to the minimum value of the standing wave value may be taken as the target transmitting frequency. Thereby, an optimal operation mode of the microwave generating device in the time period can be obtained.

And 404, sending a first attenuation instruction to a numerical control attenuator in the frequency source and sending a second attenuation instruction to an electric adjusting attenuator in the frequency source based on the target transmitting power.

The numerical control attenuator in the frequency source performs first attenuation processing on the power of the signal according to the first attenuation instruction, the electric adjusting attenuator in the frequency source performs second attenuation processing on the power of the signal according to the second attenuation instruction, and the precision of the second attenuation processing is greater than that of the first attenuation processing. For example, the numerical control attenuator can carry out the regulation on a large scale according to the power of first attenuation instruction to the signal, and the electrically tunable attenuator can carry out the fine tuning to the power of signal according to the second attenuation instruction.

For example, the first attenuation process may be desaturation attenuation of the signal; the second attenuation process may be a more accurate attenuation after the signal is de-guaranteed and attenuated.

It is understood that the signal gain is linear to a certain degree, but when the signal gain is increased to a certain degree, the signal gain tends to be saturated or even decreased. Therefore, the digital control attenuator can be used to attenuate the signal to the set value before saturation (i.e. the desaturation attenuation), and then the second attenuation process with higher precision is performed to attenuate the signal to the set value, so that the attenuation precision and efficiency can be improved.

As an implementation, the first attenuation instruction and the second attenuation instruction may be generated according to the target transmission power and the current transmission power.

For example, a difference between the target transmitting power and the current transmitting power is calculated, and a first attenuation instruction and a second attenuation instruction are generated according to the difference, the parameters of the numerical control attenuator and the parameters of the electrically-adjusted attenuator. The parameters of the numerical control attenuator can comprise a first attenuation range and a first attenuation precision, and the parameters of the electrically adjustable attenuator can comprise a second attenuation range and a second attenuation precision.

In one scenario, a first attenuation instruction may be generated based on the difference and a first attenuation range. The first attenuation instruction represents that the power of the signal is attenuated to first transmitting power through the numerical control attenuator, the first transmitting power is larger than target transmitting power, and the difference value between the first transmitting power and the target transmitting power is smaller than a second attenuation range. Then, a second attenuation instruction is generated according to the first transmission power and the target transmission power. The second attenuation instruction is used for characterizing that the power of the signal is attenuated to the target transmitting power through the electrically-adjusted attenuator.

In another scenario, if the difference is smaller than the second attenuation range, a second attenuation instruction is generated according to the difference and the target transmit power. The electrically-adjusted attenuator attenuates the power of the signal to the target transmitting power based on the second attenuation instruction. In this case, the signal may be attenuated without using a digitally controlled attenuator.

It should be noted that the frequency source of the microwave generating device may have a plurality of frequency source channels, and each frequency source channel may correspond to one digitally controlled attenuator and one electrically controlled attenuator. And the frequency source channels can be independent from each other and do not interfere with each other. Therefore, for each frequency source channel, in step 404, a first attenuation instruction may be sent to the numerical control attenuator in the frequency source channel and a second attenuation instruction may be sent to the electrical tuning attenuator in the frequency source channel based on the target transmission power and the current transmission power of the frequency source channel.

According to the method for controlling the accurate output of the frequency source energy, in the process that the microwave generating device heats the heated object, the first power of the transmitting signal and the second power of the reflecting signal of each frequency source channel under the first working frequency and the first working phase are obtained. Then, according to the first power and the second power of each frequency source channel, the standing wave information of the heated object under the first working frequency and the first working phase is determined. And determining the target emission power of the microwave generating device for heating the heated object according to the standing wave information. And based on the target transmitting power, sending a first attenuation instruction to a numerical control attenuator in the frequency source, and sending a second attenuation instruction to an electrically-adjusted attenuator in the frequency source. And the numerical control attenuator in the frequency source performs first attenuation processing on the power of the signal according to the first attenuation instruction, the electrically-adjustable attenuator in the frequency source performs second attenuation processing on the power of the signal according to the second attenuation instruction, and the precision of the second attenuation processing is greater than that of the first attenuation processing.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A multi-channel microwave generating device based on a phase control system is characterized by comprising:

wherein the frequency source and the microprocessor are integrated in the same chip.

2. A multi-channel microwave generating device based on a phase control system according to claim 1, characterized in that the chip is connected with an external reference signal, and the frequency source and the microprocessor are connected with the external reference signal through the chip.

3. The multi-channel microwave generating device based on the phased system according to claim 1 or 2, wherein each path of adjusting circuit comprises a power amplifying unit, a coupler and a circulator which are sequentially connected, and the coupler and the circulator are both connected with the microprocessor;

4. A multi-channel microwave generating apparatus based on a phased system according to claim 3, characterized in that the power amplifying unit includes one power amplifier or a plurality of cascaded power amplifiers.

5. The multi-channel microwave generating device based on the phased system according to claim 1, wherein the microprocessor is further configured to determine target operating parameters for heating the heated object according to the standing wave information, and the target operating parameters include a target operating frequency, a target operating phase and a target transmitting power.

6. The multi-channel microwave generating device based on the phased system according to claim 5, wherein the microprocessor is further configured to generate a control command according to the target operating parameter and send the control command to the frequency source;

the control finger comprises a frequency adjusting instruction, a first attenuation instruction and a second attenuation instruction, wherein the frequency adjusting instruction is used for adjusting the frequency of the frequency source output signal, the first attenuation instruction is used for performing first attenuation processing on the power of the frequency source output signal, and the second attenuation instruction is used for performing second attenuation processing on the power of the frequency source output signal; and the precision of the second attenuation processing is higher than that of the first attenuation processing.

7. The multi-channel microwave generating device based on the phased system according to claim 1, wherein the frequency source comprises a signal generating unit, a numerical control attenuator and a power divider which are connected in sequence, and a plurality of processing circuits respectively connected with the power divider; the signal generating unit, the numerical control attenuator, the power divider and each processing circuit form a frequency source channel;

8. The phased system-based multichannel microwave generating apparatus according to claim 7, wherein each of the processing circuits includes a digital phase shifter and an electrically tunable attenuator;

9. The multi-channel microwave generating device based on the phased system according to claim 1, wherein the frequency source includes a plurality of frequency source channels, each of which includes a signal generating unit, a first attenuating unit, a phase shifting unit, and a second attenuating unit;

10. An electronic device comprising a multi-channel microwave generating apparatus based on a phase control system according to any one of claims 1 to 9.