CN206004936U - Microwave testing circuit and the microwave oven comprising this microwave testing circuit - Google Patents
Microwave testing circuit and the microwave oven comprising this microwave testing circuit Download PDFInfo
- Publication number
- CN206004936U CN206004936U CN201621033174.9U CN201621033174U CN206004936U CN 206004936 U CN206004936 U CN 206004936U CN 201621033174 U CN201621033174 U CN 201621033174U CN 206004936 U CN206004936 U CN 206004936U
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- Prior art keywords
- microwave
- signal
- resistance
- circuit
- testing circuit
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/70—Feed lines
- H05B6/705—Feed lines using microwave tuning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
This utility model embodiment provides a kind of microwave testing circuit and the microwave oven comprising this microwave testing circuit, belongs to microwave regime.Described microwave testing circuit includes：Directional coupler, coupled to the microstrip line for transmitting microwave signal, for exporting the microwave signal coupling of transmission on this microstrip line to detecting circuit；And detecting circuit, for detecting that described directional coupler exports the power of the signal of this detecting circuit, and export the analog voltage signal corresponding with this power via an output port；And control unit, for according to described analog voltage signal, determining the power of described microwave signal.By technique scheme, detection by quantitative can be carried out to the output of semiconductor microwave oven, and the control unit of microwave oven also can transfer to accurately control the output of semiconductor microwave oven according to this output.
Description
Technical field
This utility model is related to microwave technology, in particular it relates to a kind of microwave testing circuit and comprise this microwave detection electricity
The microwave oven on road.
Background technology
Microwave is a kind of electromagnetic wave, and microwave oven is that kitchen range are cooked in a kind of modernization of use microwave heating of food.Microwave oven by
The part such as power supply, magnetron, control circuit and cooking cavity forms.Power supply provides about 4000 volts of high pressure, magnetron to magnetron
Under power supply excitation, continuously generate microwave, then through Wave guide system, be coupled to cooking intracavity.Near the entrance of cooking cavity,
There is a rotatable agitator, because agitator is the metal of fan-shaped, after rotating, to microwave, there are all directions
Reflection, it is possible to microwave energy is evenly distributed in cooking intracavity, thus heating food.The power bracket one of microwave oven
As be 500～1000 watts.
How to accurately control magnetron send expectation power microwave be to weigh very much for microwave-oven-heating food
Want, but any device is not had on existing microwave oven the microwave of magnetron is accurately detected.
Utility model content
The purpose of this utility model embodiment is to provide a kind of microwave testing circuit and comprise the micro- of this microwave testing circuit
Ripple stove, it can carry out detection by quantitative to the output of microwave oven.
To achieve these goals, this utility model embodiment provides a kind of microwave testing circuit, and this circuit includes：Orientation
Bonder, coupled to the microstrip line for transmitting microwave signal, for exporting the microwave signal coupling of transmission on this microstrip line
To detecting circuit；And detecting circuit, for detecting described directional coupler coupling output to the work(of the signal of this detecting circuit
Rate, and export the analog voltage signal corresponding with this power via an output port；And control unit, for according to described
Analog voltage signal, determines the power of described microwave signal.
Optionally, this microwave testing circuit also comprises：Attenuator circuit, is connected to described directional coupler and described detection electricity
Between road, the signal for exporting to the coupling of described directional coupler is decayed, so that inputting to described detection electricity
The power of the signal on road is in the detection range of described detecting circuit.
Optionally, described attenuator circuit is π type attenuator circuit.
Optionally, described π type attenuator circuit comprises：Resistance R27, resistance R28 and resistance R31, wherein resistance R28 connect
Between described directional coupler and described detecting circuit, and this resistance R28 one end via resistance R27 be grounded, the other end via
Resistance R31 is grounded.
Optionally, described directional coupler comprises：First antenna, connects to described microstrip line；And second antenna, with institute
State that first antenna is positioned opposite, for receiving the microwave signal of transmission on the described microstrip line of described first antenna transmitting.
Optionally, this microwave testing circuit also comprises：Electric capacity C40, the described microwave signal that described second antenna is received
Through this electric capacity C40 output；And resistance R25, described second antenna is through this resistance R25 ground connection.
Optionally, described detecting circuit comprises：Detector diode U7, arrives for detecting that described directional coupler couples output
The power of the signal of this detector diode U7.
Optionally, described detecting circuit also comprises：Periphery match circuit, comprises resistance R33, resistance 35 and electric capacity C47,
Wherein, the pin 1 of detector diode U7 receives the signal of described directional coupler coupling output, pin 6 through resistance R33 connect to
Described output port is grounded via electric capacity C47 simultaneously, and pin 3 connects to described output port via resistance R35, and pin 4 is grounded.
Optionally, this microwave testing circuit also comprises：Resistance R32, the pin 1 of described detector diode U7 is through this resistance
R32 is grounded.
Correspondingly, this utility model embodiment also provides a kind of microwave oven, and this microwave oven comprises above-mentioned microwave testing circuit.
By technique scheme, detection by quantitative can be carried out to the output of semiconductor microwave oven, and the control of microwave oven
Unit processed also can transfer to accurately control the output of semiconductor microwave oven according to this output.
The further feature of this utility model embodiment and advantage will give specifically in subsequent specific embodiment part
Bright.
Brief description
Accompanying drawing is used to provide and this utility model embodiment is further understood, and constitutes a part for description,
It is used for explaining this utility model embodiment together with detailed description below, but do not constitute to this utility model embodiment
Restriction.In the accompanying drawings：
The structural representation of the microwave oven that Fig. 1 provides for this utility model one embodiment, it is new that this microwave oven includes this practicality
The microwave testing circuit that type one embodiment provides；
The structural representation of the microwave oven that Fig. 2 provides for another embodiment of this utility model；
The circuit diagram of the microwave testing circuit that Fig. 3 provides for this utility model one embodiment；And
The PCB figure of the microwave testing circuit that Fig. 4 passes through for this utility model one embodiment.
Description of reference numerals
10 control unit 20 signal source
30 power amplification circuit 31 microstrip line
40 cavity 100 microwave testing circuit
110 directional coupler 120 attenuator circuit
130 detecting circuits
Specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of this utility model embodiment is described in detail.It should be understood that
It is that specific embodiment described herein is merely to illustrate and explains this utility model embodiment, is not limited to this reality
Use new embodiment.
The structural representation of the microwave oven that Fig. 1 provides for this utility model one embodiment, it is new that this microwave oven includes this practicality
The microwave testing circuit that type one embodiment provides.As shown in figure 1, described microwave oven comprises：Control unit 10, signal source 20, work(
Rate amplifying circuit 30 and cavity.After semiconductor microwave oven starts, control unit 10 sends instructions to signal source 20, signal
Source 20 produces the microwave small-signal (microwatt or milliwatt) of 2.4GHz～2.5GHz, and signal transmits in power amplification circuit 30,
It is amplified to several watts to arrive between several hectowatts in this power amplification circuit 30, be then fed in cavity 40.As illustrated, microwave
Signal is from left to right transmitted in microstrip line 31.
As shown in figure 1, the microwave testing circuit 100 that this utility model one embodiment provides includes：Directional coupler 110,
Coupled to for transmitting the microstrip line 31 of microwave signal (this microwave signal is generally high-frequency microwave signal), for by this microstrip line
The microwave signal coupling output of transmission on 31 is to detecting circuit 130；And detecting circuit 130, for detecting described directional couple
Device coupling output is to the power of the signal of this detecting circuit, and exports the simulation electricity corresponding with this power via an output port
Pressure signal；And control unit, for according to described analog voltage signal, determining the power of described microwave signal.Thereby, microwave
Testing circuit 100 can carry out detection by quantitative to the output of semiconductor microwave oven, and the control unit 10 of microwave oven also can turn
And the output of semiconductor microwave oven is accurately controlled according to this output.
The structural representation of the microwave oven that Fig. 2 provides for another embodiment of this utility model.As shown in Fig. 2 this embodiment
The structure of microwave oven providing is with the difference of embodiment illustrated in fig. 1, microwave testing circuit 100 also comprises：Decay electricity
Road 120, is connected between described directional coupler 110 and described detecting circuit 130, defeated for coupling to described directional coupler
The signal going out is decayed, so that the power of the signal inputting to described detecting circuit 130 is in described detecting circuit 130
Detection range.This decay single channel can be π type attenuator circuit, and certain this utility model is not limited to this, and any achievable signal declines
The circuit subtracting all is applicable to this.
Specifically, first, the HIGH-POWERED MICROWAVES signal of incident direction is coupled to microwave testing circuit by directional coupler
In, for preventing the signal excessive damage electronic device coupling, coupled signal is decayed, so that signal magnitude can be being detected
In the range of.Then, detecting circuit detects to the coupled signal after decay, and detection data is sent to control unit.
The circuit diagram of the microwave testing circuit that Fig. 3 provides for this utility model one embodiment.As shown in figure 3, described orientation
Bonder 110 comprises：First antenna, connects to described microstrip line 31, the HIGH-POWERED MICROWAVES signal on microstrip line 31 is from left to right
Transmission；And second antenna, positioned opposite with described first antenna, for receiving the described microstrip line of described first antenna transmitting
The microwave signal of upper transmission.The concrete structure of this directional coupler cannot clearly be found out in figure 3, but can scheme from the PCB of Fig. 4
In clearly find out.This directional coupler is expressed for two parts (as shown in reference " RF ") in figure 3, wherein one
Divide and be connected on microstrip line 31, another part then receives and connects the microwave signal that part on the microstrip line is sent.
As shown in figure 3, this microwave testing circuit also comprises：Electric capacity C40, the described microwave letter that described second antenna is received
Number through this electric capacity C40 output；And resistance R25, described second antenna is through this resistance R25 ground connection.Spy according to directional coupler
Property, the signal of its coupled output can transmit to electric capacity C40 direction, and electric capacity C40 plays the role of stopping direct current and leads to exchange, thus preventing
The signal being coupled to passes through resistance R25 to ground.The resistance of resistance R25 can be mated requirement according to four-pole network and is configured.
The signal carrying out self-capacitance C40 can be via a π type attenuator circuit 120, and this π type attenuator circuit 120 comprises resistance
R27, resistance R28 and resistance R31, wherein resistance R28 are connected between described electric capacity C40 direction and detecting circuit, and this electricity
Resistance R28 one end is grounded via resistance R27, and the other end is grounded via resistance R31.This π type attenuator circuit 120 it is not necessary to,
The size of the signal that the parameter of this π type attenuator circuit 120 can come according to coupling can detect with rear end power detection device
Range of signal and be set.
After a described π type attenuator circuit 120 is decayed, described signal is input to detecting circuit 130.This detection electricity
Road 130 comprises：Detector diode U7, for the power of the signal after detection decay, and exports the simulation corresponding with this power
Voltage signal；And periphery match circuit, comprise resistance R33, resistance 35 and electric capacity C47.Wherein, the drawing of detector diode U7
Foot 1 receives the signal after described decay, and pin 6 connects to described output port simultaneously via electric capacity C47 ground connection through resistance R33,
Pin 3 connects to described output port via resistance R35, and pin 4 is grounded.
In addition, this microwave testing circuit also comprises：The pin 1 of resistance R32, described detector diode U7 is through this resistance R32
Ground connection.This resistance R32 is the effect making microwave testing circuit constitute path, and one end fetches from after π type attenuator circuit 120 decay
Microwave signal, the other end be grounded.
The PCB figure of the microwave testing circuit that Fig. 4 passes through for this utility model one embodiment.As shown in figure 4, pcb board comprises
?：Microstrip line 31, directional coupler 110, π type attenuator circuit 120 and detecting circuit 130.Wherein, microstrip line 31 is used for passing
Defeated microwave signal, transmission direction on this microstrip line 31 for the microwave signal is from left to right.The first antenna of directional coupler 110
111 are located on microstrip line 31, and the second antenna 112 is positioned opposite with this first antenna 111, for receiving described first antenna 111
The microwave signal of transmission on the described microstrip line 31 of transmitting, can by adjust the width of this two " miniature antennas ", length, both
The distance between realizing the different degrees of coupling.For π type attenuator circuit 120 and detecting circuit 130, its structure and above-mentioned ginseng
The structure examining Fig. 3 description is identical, repeats no more in this.
Assume that the high-frequency microwave signal power on microstrip line is 50dBm, the degree of coupling of directional coupler is 40dB, decay electricity
Decay 5dB on road, then on microstrip line, the high-frequency microwave signal of 50dBm is coupled to attenuator circuit through directional coupler, finally defeated
The signal power entering to detector diode (decays electric for 50dBm (original signal magnitude in microstrip line) -40dB (degree of coupling) -5dB
Road)=5dBm, that is,：High-frequency microwave signal in microstrip line 45dB poor with the detection signal being input in detector diode.Input
Signal to be detected in detector diode, after detector diode, becomes an analog voltage.Signal power to be detected is got over
Greatly, the analog voltage of detector diode output is bigger.Finally, the size by sampling analogue voltage for the control unit, judges micro-strip
The watt level of line medium-high frequency microwave signal.
Accordingly, this utility model also provides a kind of microwave oven, and this microwave oven comprises above-mentioned microwave testing circuit.
Describe the optional embodiment of this utility model example above in association with accompanying drawing in detail, but, this utility model is implemented
Example is not limited to the detail in above-mentioned embodiment, in the range of the technology design of this utility model embodiment, can be right
The technical scheme of this utility model embodiment carries out multiple simple variant, and these simple variant belong to this utility model embodiment
Protection domain.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, this utility model is implemented
Example no longer separately illustrates to various possible compound modes.
It will be appreciated by those skilled in the art that all or part of step realized in above-described embodiment method can be by
Program to complete come the hardware to instruct correlation, and this program storage, in a storage medium, includes some instructions use so that one
Individual (can be single-chip microcomputer, chip etc.) or processor (processor) execute the whole of each embodiment methods described of the application
Or part steps.And aforesaid storage medium includes：USB flash disk, portable hard drive, read only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
Additionally, combination in any can also be carried out between the various different embodiment of this utility model embodiment, as long as
, without prejudice to the thought of this utility model embodiment, it equally should be considered as this utility model embodiment disclosure of that for it.
Claims (10)
1. a kind of microwave testing circuit is it is characterised in that this circuit includes：
Directional coupler, coupled to the microstrip line for transmitting microwave signal, for the microwave signal that will transmit on this microstrip line
Coupling output is to detecting circuit；And
Detecting circuit, for detecting the coupling output of described directional coupler to the power of the signal of this detecting circuit, and via one
The output port output analog voltage signal corresponding with this power；And
Control unit, for according to described analog voltage signal, determining the power of described microwave signal.
2. microwave testing circuit according to claim 1 is it is characterised in that this microwave testing circuit also comprises：
Attenuator circuit, is connected between described directional coupler and described detecting circuit, for coupling to described directional coupler
The signal of output is decayed, so that the power of the signal inputting to described detecting circuit is in the detection of described detecting circuit
Scope.
3. microwave testing circuit according to claim 2 is it is characterised in that described attenuator circuit is π type attenuator circuit.
4. microwave testing circuit according to claim 3 is it is characterised in that described π type attenuator circuit comprises：
Resistance R27, resistance R28 and resistance R31, wherein resistance R28 are connected to described directional coupler and described detecting circuit
Between, and this resistance R28 one end via resistance R27 be grounded, the other end via resistance R31 be grounded.
5. microwave testing circuit according to claim 1 is it is characterised in that described directional coupler comprises：
First antenna, connects to described microstrip line；And
Second antenna, positioned opposite with described first antenna, the described microstrip line for receiving described first antenna transmitting uploads
Defeated microwave signal.
6. microwave testing circuit according to claim 5 is it is characterised in that this microwave testing circuit also comprises：
Electric capacity C40, the described microwave signal that described second antenna is received exports through this electric capacity C40；And
Resistance R25, described second antenna is grounded through this resistance R25.
7. microwave testing circuit according to claim 1 is it is characterised in that described detecting circuit comprises：
Detector diode U7, for detecting described directional coupler coupling output to the power of the signal of this detector diode U7.
8. microwave testing circuit according to claim 7 is it is characterised in that described detecting circuit also comprises：
Periphery match circuit, comprises resistance R33, resistance 35 and electric capacity C47,
Wherein, the pin 1 of detector diode U7 receives the signal of described directional coupler coupling output, and pin 6 is through resistance R33 even
It is connected to described output port to be grounded via electric capacity C47, pin 3 connects to described output port, pin 4 via resistance R35 simultaneously
Ground connection.
9. microwave testing circuit according to claim 8 is it is characterised in that this microwave testing circuit also comprises：
The pin 1 of resistance R32, described detector diode U7 is grounded through this resistance R32.
10. a kind of microwave oven is it is characterised in that this microwave oven comprises according to any one of claim 1-9 claim
Microwave testing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621033174.9U CN206004936U (en) | 2016-08-31 | 2016-08-31 | Microwave testing circuit and the microwave oven comprising this microwave testing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621033174.9U CN206004936U (en) | 2016-08-31 | 2016-08-31 | Microwave testing circuit and the microwave oven comprising this microwave testing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206004936U true CN206004936U (en) | 2017-03-08 |
Family
ID=58193942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621033174.9U Withdrawn - After Issue CN206004936U (en) | 2016-08-31 | 2016-08-31 | Microwave testing circuit and the microwave oven comprising this microwave testing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206004936U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106255251A (en) * | 2016-08-31 | 2016-12-21 | 广东美的厨房电器制造有限公司 | Microwave testing circuit and comprise the microwave oven of this microwave testing circuit |
-
2016
- 2016-08-31 CN CN201621033174.9U patent/CN206004936U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106255251A (en) * | 2016-08-31 | 2016-12-21 | 广东美的厨房电器制造有限公司 | Microwave testing circuit and comprise the microwave oven of this microwave testing circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170308 Effective date of abandoning: 20221118 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20170308 Effective date of abandoning: 20221118 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |