CN113573432A - Multi-channel microwave generating device of phase control system and programmable frequency source chip thereof - Google Patents
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Abstract
The application is applicable to the technical field of microwaves and provides a multi-channel microwave generating device with a phase control system and a programmable frequency source chip thereof. The programmable frequency source chip comprises a microprocessor and at least two frequency source channels, wherein each frequency source channel comprises a signal generation unit, a first attenuation unit, a phase-shifting unit and a second attenuation unit; the signal generating unit is used for generating a first power signal with a preset frequency, the first attenuating unit is used for performing first attenuation processing on the first power signal to obtain a second power signal, the phase shifting unit is used for performing phase shifting processing on the received signal, and the second attenuating unit is used for performing second attenuation processing on the received signal; the microprocessor is used for controlling the signal generating unit, the first attenuation unit, the phase shifting unit and the second attenuation unit of each frequency source channel so as to control the frequency, the phase and the power of the output signal of each frequency source channel. The embodiment of the application can accurately control the output power of the programmable frequency source chip.
Description
Technical Field
The application belongs to the field of microwaves, and particularly relates to a multi-channel microwave generating device with a phase control system and a programmable frequency source chip thereof.
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 applied to a phase control system of microwave heating and a programmable frequency source chip thereof, which can improve the control accuracy of the output power of the frequency source.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a programmable frequency source chip, which is applied to a microwave generating device, where the programmable frequency source chip includes at least two frequency source channels, and each frequency source channel includes a signal generating unit, a first attenuating unit, a phase shifting unit, and a second attenuating 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 an attenuation accuracy of the first attenuation process is different from an attenuation accuracy of the second attenuation process;
the microprocessor is connected with the signal generating unit, the first attenuation unit, the phase shifting unit and the second attenuation unit in each frequency source channel and is used for controlling the signal generating unit, the first attenuation unit, the phase shifting unit and the second attenuation unit so as to control the frequency, the phase and the power of the output signal of each frequency source channel.
In the embodiment of the application, for each frequency source channel, the signal generating unit can generate a first power signal with a preset frequency, and the first attenuation unit performs first attenuation processing on the first power signal to obtain a second power signal. Then, the phase shift unit performs phase shift processing on the received signal, and the second attenuation unit performs second attenuation processing on the received signal. The output power of the programmable frequency source chip can be adjusted through the first attenuation treatment and the second attenuation treatment, the phase of the power signal can be adjusted through the phase shifting treatment, and the signal generation unit can control the frequency of the first power signal, so that the output power of the programmable frequency source chip can be accurately controlled.
For example, the signal received by the phase shifting unit may be the second power signal, may also be a signal obtained by amplifying the second power signal, and may also be a signal output by the second attenuating unit. Similarly, the signal received by the second attenuation unit may be the second power signal, may also be a signal obtained by amplifying the second power signal, and may also be a signal output by the phase shift unit.
Based on the first aspect, in some embodiments, the attenuation accuracy of the first attenuation process is smaller than the attenuation accuracy of the second attenuation process.
For example, the attenuation accuracy of the first attenuation process may be smaller than that of the second attenuation process, or the attenuation accuracy of the first attenuation process may be larger than that of the second attenuation process. For example, the first attenuation process is to perform desaturation attenuation on the power signal, and the second attenuation process is to perform more precise attenuation after performing depreciation and attenuation on the power signal.
Specifically, the first attenuation processing may be to perform a large-amplitude attenuation (may also be a coarse attenuation) on the signal by the first attenuation unit, and the second attenuation processing may be to perform a small-amplitude attenuation (may also be a precise attenuation) on the signal by the second attenuation unit. The signal is attenuated to a gain unsaturation through the first attenuation unit, and then the signal is attenuated to a set value through the 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 first attenuation unit can be used to attenuate the signal to the saturation (i.e. the desaturation attenuation), and then the second attenuation unit can be used to perform the second attenuation process with higher precision to attenuate the signal to the set value, so that the attenuation precision and efficiency can be improved.
Based on the first aspect, in some embodiments, the phase shifting unit includes a digital phase shifter, and the second attenuation unit includes an electrically tunable attenuator;
the digital phase shifter is used for performing phase shifting processing on the second power signal, 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-adjusted attenuator is used for performing second attenuation processing on the second power signal, and the digital phase shifter is used for performing phase shift processing on the power signal subjected to the second attenuation processing.
Based on the first aspect, in some embodiments, each of the frequency source channels further includes a channel switch, and the channel switch is configured to control on/off of the frequency source channel.
In each working period of the microwave generating device, the channel switch is firstly opened, and after the signal generating unit, the first attenuation unit, the phase shifting unit and the second attenuation unit determine working parameters, the channel switch is closed, and the programmable frequency source chip outputs signals. When the next working period comes, the channel switch is switched off, and after the signal generation unit, the first attenuation unit, the phase shift unit and the second attenuation unit determine the working parameters again, the channel switch is switched on, and the programmable frequency source chip outputs signals.
Based on the first aspect, in some embodiments, each of the frequency source channels further includes a second amplifying unit, and the second amplifying unit is configured to amplify the power signal after the second attenuation processing.
Wherein the second amplifying unit may include one or more power amplifiers. After the second attenuation processing is performed on the signal, the power of the signal is usually low, and at this time, the signal needs to be amplified by a certain multiple to meet the power of the signal output by the programmable frequency source chip.
Based on the first aspect, in some embodiments, the microprocessor is configured to send a frequency modulation instruction to the signal generation unit, send a first attenuation instruction to the numerical control attenuator, send a phase shift instruction to the digital phase shifter, send a second attenuation instruction to the electrical tuning attenuator, and send a channel switch instruction to the channel switch;
the signal generating unit executes the frequency modulation instruction to adjust the frequency of the first power signal, the numerical control attenuator executes the first attenuation processing on the first power signal according to the first attenuation instruction, the digital phase shifter performs the phase shift processing on the power signal transmitted by the power divider according to the phase shift instruction, the electric adjusting attenuator performs the second attenuation processing on the power signal transmitted by the power divider according to the second attenuation instruction, and the channel switch executes the channel switch instruction to control the on-off of a corresponding frequency source channel.
Based on the first aspect, in some embodiments, the programmable frequency source chip is further provided with a crystal oscillator interface and a power interface, the crystal oscillator interface is connected with the signal generation unit, and the crystal oscillator interface is further configured to be connected with an external crystal oscillator; the power interface can be connected with an external power supply and supplies power to the signal generation unit, the first attenuation unit, the phase shift unit, the electrically-adjusted attenuator and the channel switch.
Based on the first aspect, in some embodiments, the phase shift unit of each frequency source channel performs the same or different phase shift processing on the received power signal, the first attenuation unit of each frequency source channel performs the same or different first attenuation processing on the received power signal, and the second attenuation unit of each frequency source channel performs the same or different second attenuation processing on the received power signal.
For example, in each operating cycle of the microwave generating device, the phase shifting units between different frequency source channels may perform the same or different phase shifting processes on the signals, the first attenuation units may perform the same or different first attenuation processes on the power signals, and the second attenuation units may perform the same or different second attenuation processes on the power signals. For example, in a working period, the phase shift angles of the digital phase shifters to the power signals are different, the attenuation degrees of the numerical control attenuators to the power signals are different, and the attenuation degrees of the electrical adjustable attenuators to the power signals are different.
Based on the first aspect, in some embodiments, each of the frequency source channels further includes a first amplifying unit disposed between the first attenuating unit and the phase shifting unit, and the first attenuating unit is connected to the phase shifting unit through the first amplifying unit.
Wherein the first amplifying unit may include one or more power amplifiers. After the first attenuation processing is performed on the signal, the power of the signal is usually low, and at this time, the signal needs to be amplified by a certain multiple to meet the power of the signal output by the programmable frequency source chip.
A second aspect of embodiments of the present application provides a microwave generating device, including a programmable frequency source chip as described in any one of the first aspects.
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 circuit diagram of a programmable frequency source chip according to an embodiment of the present disclosure.
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.
The following describes a programmable frequency source chip provided in the embodiments of the present application, taking two frequency source channels as an example.
Fig. 1 shows a schematic structural diagram of a programmable frequency source chip provided in an embodiment of the present application. Referring to fig. 1, a programmable frequency source chip 110 may include a microprocessor 112 and a frequency source (not shown). The frequency source includes a first frequency source channel (channel 1 shown in fig. 1) and a second frequency source channel (channel 2 shown in fig. 1). Through the first frequency source channel and the second frequency source channel, the programmable frequency source chip 110 can output two signals.
The first frequency source channel includes a first signal generating unit 1131, a first numerical control attenuator 1132, a first power amplifier 1133, a first digital phase shifter 1134 and a first electrically tunable attenuator 1135, which are connected in sequence.
The second frequency source channel includes a second signal generating unit 1141, a second digital controlled attenuator 1142, a third power amplifier 1143, a second digital phase shifter 1144 and a second electrically-tuned attenuator 1145, which are connected in sequence.
Specifically, an output end of the first signal generating unit 1131 is connected to an input end of the first digitally controlled attenuator 1132, an output end of the first digitally controlled attenuator 1132 is connected to an input end of the first digital phase shifter 1134 through the first power amplifier 1133, an output end of the first digital phase shifter 1134 is connected to an input end of the first electrically tunable attenuator 1135, and an output end of the first electrically tunable attenuator 1135 is connected to a first output end of the programmable frequency source chip 110.
The output end of the second signal generating unit 1141 is connected to the input end of the second digital attenuator 1142, the output end of the second digital attenuator 1142 is connected to the input end of the second digital phase shifter 1144 through the third power amplifier 1143, the output end of the second digital phase shifter 1144 is connected to the input end of the second electrically tunable attenuator 1145, and the output end of the second electrically tunable attenuator 1145 is connected to the second output end of the programmable frequency source chip 110.
The microprocessor 112 is connected with the signal generating units of the frequency source channels, the numerical control attenuator, the digital phase shifter and the electrically-adjusted attenuator. The 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 programmable frequency source chip 110.
As shown in fig. 1, the microprocessor 112 is connected to the first signal generating unit 1131, the first digitally controlled attenuator 1132, the first digital phase shifter 1134, the first electrically tunable attenuator 1135, the second signal generating unit 1141, the first digitally controlled attenuator 1142, the second digital phase shifter 1144 and the second electrically tunable attenuator 1145.
The microprocessor 112 is configured to send a frequency modulation instruction to the first signal generating unit 1131 and the second signal generating unit 1141, send a first attenuation instruction to the first numerical control attenuator 1132 and the second numerical control attenuator 1142, send a phase shift instruction to the first digital phase shifter 1134 and the second digital phase shifter 1144, and send a second attenuation instruction to the first electrically tunable attenuator 1135 and the second electrically tunable attenuator 1145, respectively.
The first signal generating unit 1131 and the second signal generating unit 1141 respectively execute a frequency modulation command to adjust the frequency of the respective first power signal. The first digitally controlled attenuator 1132 and the second digitally controlled attenuator 1142 perform a first attenuation process on the respective first power signals according to the first attenuation instruction, respectively. The first digital phase shifter 1134 performs a phase shift process on the received power signal according to the phase shift instruction, and the second digital phase shifter 1144 performs a phase shift process on the received power signal according to the phase shift instruction. The first electrically tunable attenuator 1135 performs a second attenuation process on the received power signal according to the second attenuation instruction, and the second electrically tunable attenuator 1145 performs the second attenuation process on the received power signal according to the second attenuation instruction.
In addition, the programmable frequency source chip 110 may be further provided with a crystal oscillator interface and a power interface. The first signal generating unit 1131 and the second signal generating unit 1141 of the programmable frequency source chip 110 may be connected to an external crystal oscillator through a crystal oscillator interface, where the external crystal oscillator may be a 16MHz industrial patch crystal oscillator. The programmable frequency source chip 110 may be connected to an external power source through a power interface, and an LDO (low dropout regulator) may be built in the programmable frequency source chip 110. The LDO is capable of converting an external power supply to 3.3V or 5V to power various parts in the programmable frequency source chip 110.
An input end of the first signal generating unit 1131 is connected to an external crystal oscillator through a crystal oscillator interface, and an output end of the first signal generating unit 1131 is connected to an input end of the first digitally controlled attenuator 1132. The input end of the second signal generating unit 1141 is connected to the external crystal oscillator through the crystal oscillator interface, and the output end of the second signal generating unit 1141 is connected to the input end of the second digital controlled attenuator 1142.
In some embodiments, the programmable frequency source chip 110 may also be provided with a communication interface (not shown). The microprocessor 112 can be communicatively connected to an external terminal via the communication interface. The user can control the working state of the programmable frequency source chip 110 through the external terminal, and know the real-time parameters of the programmable frequency source chip 110, and program the programmable frequency source chip 110, etc.
Illustratively, the parameters of the first digitally controlled attenuator 1132 and the second digitally controlled attenuator 1142 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 the first electrically tunable attenuator 1135 and the second electrically tunable attenuator 1145 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 first digital phase shifter 1134 and the second digital phase shifter 1144 are as follows: 0-360 degrees, 1.4 degrees of stepping and less than or equal to 2 degrees of phase shifting precision.
For example, the operating frequency of the programmable frequency source chip 110 may be 915MHz ± 15MHz, 2450MHz ± 50MHz, 433MHz, or other frequencies, which is not limited herein. The power of the microwave oven to which the programmable frequency source chip 110 of the embodiment of the present application is applied may be 10W to 1 KW.
In some embodiments, the programmable frequency source chip 110 may further include a first pass switch, a second power amplifier, a second pass switch, and a fourth power amplifier.
The first frequency source channel includes a first signal generating unit 1131, a first numerical control attenuator 1132, a first power amplifier 1133, a first digital phase shifter 1134, a first electrically tunable attenuator 1135, a first channel switch, and a second power amplifier, which are connected in sequence. The output end of the first electrically tunable attenuator 1135 is connected to the input end of the second power amplifier through the first channel switch, and the output end of the second power amplifier is connected to the first output end of the programmable frequency source chip 110.
The second frequency source channel includes a second signal generating unit 1141, a second digital controlled attenuator 1142, a third power amplifier 1143, a second digital phase shifter 1144, a second electrically-tuned attenuator 1145, a second channel switch and a fourth power amplifier, which are connected in sequence. The output end of the second electrically tunable attenuator 1145 is connected to the input end of the fourth power amplifier through the second channel switch, and the output end of the fourth power amplifier is connected to the second output end of the programmable frequency source chip 110.
In this embodiment, the first power amplifier 1133 is a first amplifying unit of the first frequency source channel, and the second power amplifier is a second amplifying unit of the first frequency source channel. The third power amplifier 1143 is a first amplifying unit of the second frequency source channel, and the fourth power amplifier is a second amplifying unit of the second frequency source channel.
In addition, the microprocessor 112 is also connected to a first channel switch and a second channel switch, respectively. The microprocessor 112 is configured to send channel switch commands to the first channel switch and the second channel switch, respectively. The first channel switch and the second channel switch respectively execute channel switch instructions to control the on-off of the respective frequency source channels.
In this embodiment, the first power amplifier 1113 is a first amplifying unit of the programmable frequency source chip 110, and the second power amplifier and the third power amplifier are second amplifying units of two processing circuits of the programmable frequency source chip 110, respectively.
The parameters of the first channel switch and the second channel switch are as follows: the degree of turn-off is 60dB, and the response time is within 150 ms.
It should be noted that the circuit structure shown in fig. 1 is only an example of the programmable frequency source chip 110, and the embodiment of the present application is not limited thereto.
In some embodiments, the programmable 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 first power amplifier 1133 is connected to the first electrically tunable attenuator 1135, the first digital phase shifter 1134, and the first channel switch in sequence. For another example, the first power amplifier 1133 is connected to the first channel switch, the first electrically tunable attenuator 1135, and the first digital phase shifter 1134 in sequence. The second power amplifier is located behind the first electrically tunable attenuator 1135, and may amplify the attenuated signal.
The embodiment of the application also provides a multi-channel microwave generating device with a phase control system, which comprises any one of the programmable frequency source chips and has the beneficial effects of the programmable frequency source chip. The phase control system is a microwave generating device, has a phase shifting function and can control the phase of a microwave signal.
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 (10)
1. A programmable frequency source chip is applied to a microwave generating device and is characterized by comprising a microprocessor and at least two frequency source channels, wherein each frequency source channel comprises a signal generating unit, a first attenuation unit, a phase shifting 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 an attenuation accuracy of the first attenuation process is different from an attenuation accuracy of the second attenuation process;
the microprocessor is connected with the signal generating unit, the first attenuation unit, the phase shifting unit and the second attenuation unit in each frequency source channel and is used for controlling the signal generating unit, the first attenuation unit, the phase shifting unit and the second attenuation unit so as to control the frequency, the phase and the power of the output signal of each frequency source channel.
2. The programmable frequency source chip of claim 1, wherein an attenuation precision of the first attenuation process is less than an attenuation precision of the second attenuation process.
3. The programmable frequency source chip of claim 1, wherein the phase shifting unit comprises a digital phase shifter, and the second attenuation unit comprises an electrically tunable attenuator;
the digital phase shifter is used for performing phase shifting processing on the second power signal, 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-adjusted attenuator is used for performing second attenuation processing on the second power signal, and the digital phase shifter is used for performing phase shift processing on the power signal subjected to the second attenuation processing.
4. The programmable frequency source chip of claim 3, wherein each frequency source channel further comprises a channel switch for controlling the on/off of the frequency source channel.
5. The programmable frequency source chip of claim 3 or 4, wherein each frequency source channel further comprises a second amplifying unit, and the second amplifying unit is configured to amplify the power signal after the second attenuation processing.
6. The programmable frequency source chip of claim 4, wherein the microprocessor is configured to send a frequency modulation instruction to the signal generation unit, send a first attenuation instruction to the numerical control attenuator, send a phase shift instruction to the digital phase shifter, send a second attenuation instruction to the electrical tuning attenuator, and send a channel switch instruction to the channel switch;
the signal generating unit executes the frequency modulation instruction to adjust the frequency of the first power signal, the numerical control attenuator executes the first attenuation processing on the first power signal according to the first attenuation instruction, the digital phase shifter performs the phase shift processing on the power signal transmitted by the power divider according to the phase shift instruction, the electric adjusting attenuator performs the second attenuation processing on the power signal transmitted by the power divider according to the second attenuation instruction, and the channel switch executes the channel switch instruction to control the on-off of a corresponding frequency source channel.
7. The programmable frequency source chip according to claim 6, wherein the programmable frequency source chip is further provided with a crystal oscillator interface and a power interface, the crystal oscillator interface is connected with the signal generating unit, and the crystal oscillator interface is further used for being connected with an external crystal oscillator; the power interface can be connected with an external power supply and supplies power to the signal generation unit, the first attenuation unit, the phase shift unit, the electrically-adjusted attenuator and the channel switch.
8. The programmable frequency source chip of claim 1, wherein the phase shift unit of each frequency source channel performs the same or different phase shift processing on the received power signal, the first attenuation unit of each frequency source channel performs the same or different first attenuation processing on the received power signal, and the second attenuation unit of each frequency source channel performs the same or different second attenuation processing on the received power signal.
9. The programmable frequency source chip of claim 1, wherein each frequency source channel further comprises a first amplifying unit, the first amplifying unit is disposed between the first attenuating unit and the phase shifting unit, and the first attenuating unit is connected to the phase shifting unit through the first amplifying unit.
10. A multi-channel microwave generating apparatus of a phase-controlled system, comprising a programmable frequency source chip according to any one of claims 1 to 9.
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| 赵雅琴，候成宇，陈浩编著: "《通信电子线路 第2版》", 31 May 2020, 哈尔滨：哈尔滨工业大学出版社, pages: 98 - 99 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115066050A (en) * | 2022-07-05 | 2022-09-16 | 三微电子科技(苏州)有限公司 | Microwave heating control method and device and electronic equipment |
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