CN205320319U - Microwave output power control unit - Google Patents
Microwave output power control unit Download PDFInfo
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- CN205320319U CN205320319U CN201521133091.2U CN201521133091U CN205320319U CN 205320319 U CN205320319 U CN 205320319U CN 201521133091 U CN201521133091 U CN 201521133091U CN 205320319 U CN205320319 U CN 205320319U
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- 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
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- 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
Abstract
The utility model relates to a microwave output power control unit, above -mentioned microwave output power control unit includes: microwave generator, attenuator circuit, amplifier circuit, controller, microwave generator, attenuator circuit and amplifier circuit's input connects gradually, the controller is connected respectively microwave generator, attenuator circuit and amplifier circuit's control end, the microwave takes place for microwave generator, through the microwave is exported in the attenuator circuit processing that attenuates after rethread amplifier circuit enlargies, microwave generator, attenuator circuit and amplifier circuit work are controlled respectively to the controller, its magnetron that need not to rely on work under the high voltage ring border, the security that can improve control microwave output power, can also improve the stability of microwave output power for a long time, and then improve corresponding microwave heating equipment and carry out the effect that heats.
Description
Technical field
This utility model relates to microwave and controls technical field, particularly relates to a kind of microwave output power and controls device.
Background technology
Utilize the device that microwave is heated, such as microwave oven etc., being utilize microwave to make the hydrone in food produce high frequency time to move, severe friction heating occurring, thus reaching the purpose of heating (or culinary art) food between molecule. Microwave heating equipment on the market is all use magnetron to produce 2450MHz or 915MHz frequency microwave signal at present.
The high power LD MOS (LaterallyDiffusedMetalOxideSemiconductor LDMOS) used in mobile communication and GaN (GalliumNitride gallium nitride) carries out the adjustment of microwave output power, even if in maximal work situation, the life-span still can up to millions of hours. Progress along with the development of technique and technology, the saturation power of high power LD MOS and GaN is increasing, saturation efficiency is more and more higher, simultaneously along with the swift and violent expansion of the scale of the raising of semiconductor manufacturing level and Mobile Communications Market, the price of high power LD MOS, GaN, VCO also presents and sharply declines, and substantially can receive for consumer product. But, the control of traditional microwave output needs to rely on the magnetron worked under environment under high pressure, makes safety in the control process of microwave output power low.
Utility model content
Based on this, it is necessary to for the technical problem that safety in the control process of conventional art microwave output power is low, it is provided that a kind of microwave output power controls device.
A kind of microwave output power controls device, it is characterised in that including: microwave generator, attenuator circuit, amplifying circuit, controller; The input of described microwave generator, attenuator circuit and amplifying circuit is sequentially connected with, and described controller connects described microwave generator, attenuator circuit and amplifying circuit respectively;
Described microwave generator generation microwave, carries out attenuation processing by described attenuator circuit, exports microwave again through amplifying circuit after being amplified.
Above-mentioned microwave output power controls device, by microwave generator, attenuator circuit, amplifying circuit are sequentially connected with, and make controller noted above connect described microwave generator, attenuator circuit and amplifying circuit respectively, make microwave output power can be controlled according to attenuation network, without relying on the magnetron worked under environment under high pressure, it is possible to improve the safety controlling microwave output power; And utilize attenuator circuit pad value that above-mentioned microwave output power is adjusted, make above-mentioned microwave output power will not change along with the change of above-mentioned microwave generation power, the stability of microwave output power can be improved for a long time, and then the effect that corresponding microwave heating equipment is heated can be improved.
Accompanying drawing explanation
The microwave output power that Fig. 1 is an embodiment controls apparatus structure schematic diagram;
The microwave output power that Fig. 2 is an embodiment controls apparatus structure schematic diagram;
Fig. 3 is the microwave output power control method schematic flow sheet of an embodiment;
Fig. 4 is the overheat protector flow chart of an embodiment;
Fig. 5 is the overcurrent protection flow chart of an embodiment;
Fig. 6 is the reflection power overhaul flow chart of an embodiment.
Detailed description of the invention
Microwave output power this utility model provided below in conjunction with accompanying drawing controls the detailed description of the invention of device and is illustrated.
The microwave output power showing an embodiment with reference to Fig. 1, Fig. 1 controls apparatus structure schematic diagram, including: microwave generator 11, attenuator circuit 13, amplifying circuit 15, controller 17; Described microwave generator 11, attenuator circuit 13 and, the input of amplifying circuit 15 be sequentially connected with, described controller 17 connects the control end of described microwave generator 11, attenuator circuit 13 and amplifying circuit 15 respectively;
There is microwave in described microwave generator 11, carries out attenuation processing by described attenuator circuit 13, exports microwave again through amplifying circuit 15 after being amplified, and described controller 17 controls microwave generator 11, attenuator circuit 13 and amplifying circuit 15 respectively and works.
The heating power that above-mentioned microwave heating power can be inputted by microwave heating equipment according to its demand for heat for user.
Above-mentioned amplifying circuit can include n amplifier, and the first amplifier is sequentially connected with to the n-th amplifier; Wherein, n is positive integer, (n-1)th, n level amplifier both single power devices constitute, it is possible to be made up of multiple power devices, when (n-1)th, n level is when being made up of multiple power devices, and Vgs (n-1), Vgs (n) can be one group of voltage data; (n-1)th grade, n level power device can choose LDMOS (LaterallyDiffusedMetalOxideSemiconductor LDMOS) or GaN (GalliumNitride gallium nitride) power device. Above-mentioned microwave generator can be realized by PLL (PhaseLockedLoop phaselocked loop) or VCO (VoltageControlledOscillator voltage controlled oscillator) or power device self-oscillation, generally, microwave generator generation microwave is 915 ± 25MHz (megahertz) or 2450 ± 50MHz.
Above-mentioned attenuator circuit 13 is the adjustable attenuator circuit of pad value, and it can include simulation adjustable damping network, it is also possible to include numeral adjustable damping network.
As an embodiment, if the Maximum Power Output of microwave heating equipment is Pout, microwave generator power is Pin, adjustable damping network degradation value is GATT, the first booster output gain is G1... the (n-1)th booster output gain is Gn-1, the n-th booster output gain is Gn. Then have:
Pout=Pin-GATT+G1+……+Gn-1+Gn;
In actual high volume production process, above-mentioned Pin、G1……Gn-1、GnInevitably exist discrete, some of which value can bigger than normal, some value can be less than normal, causes Pin+G1+……+Gn-1+GnBigger than normal or less than normal with value. When time bigger than normal with value, most final stage (namely n-th grade) amplifier device is made to be operated in promotion state, vigorousness reduction; When time less than normal with value, cause PoutAlso less than normal, the microwave power being transported to furnace chamber is inadequate. At this point it is possible to regulate attenuation network pad value GATT, make Pin、G1……Gn-1、GnWhen taking normal centrifugal pump, Pout is still fixed value, thus realizing the purpose by adjustable damping network control microwave output power.
The microwave output power that the present embodiment provides controls device, by microwave generator, attenuator circuit, amplifying circuit are sequentially connected with, and make controller noted above connect described microwave generator, attenuator circuit and amplifying circuit respectively, make microwave output power can be controlled according to attenuation network, without relying on the magnetron worked under environment under high pressure, it is possible to improve the safety controlling microwave output power; And utilize attenuator circuit pad value that above-mentioned microwave output power is adjusted, make above-mentioned microwave output power will not change along with the change of above-mentioned microwave generation power, the stability of microwave output power can be improved for a long time, and then the effect that corresponding microwave heating equipment is heated can be improved. Above-mentioned microwave output power is used to control the microwave heating equipment of device without relying on volume, weight magnetron all bigger than normal and corresponding power subsystem, the volume and weight of above-mentioned microwave heating equipment can be reduced, improve the convenience using this microwave heating equipment.
In one embodiment, above-mentioned amplifying circuit can include n amplifier, and the first amplifier is sequentially connected with to the n-th amplifier; The input of described first amplifier connects described attenuator circuit, and the outfan of described n-th amplifier connects microwave outfan, and wherein, n is positive integer.
In the present embodiment, amplifying circuit includes n amplifier, and each amplifier has different gains, it is possible to each gain is carried out different settings, to improve the controllability that the microwave after decay is amplified by above-mentioned amplifying circuit. The input of above-mentioned first amplifier can connect described attenuator circuit, and the outfan of described n-th amplifier can connect microwave outfan. The amplifier tube (but not amplifier tube of fixed gain) that above-mentioned attenuator circuit can save with an adjustable gain with the first amplifier replaces, now can realize the gain of amplification system by regulating the gain of the first amplifier, thus realizing the control of microwave output power.
Above-mentioned microwave output power controls in the microwave heating equipment that device is corresponding, when needing less microwave heating power, the supply voltage of microwave heating equipment is turned down therewith, to obtain maximal efficiency, when the gain of amplifying circuit remains unchanged, the pad value regulating attenuator circuit can be passed through to turn the microwave power of input amplifying circuit down, so by increasing the pad value of above-mentioned attenuator circuit, the microwave power making input amplifying circuit reduces, so that follow-up microwave output power reduces, it is possible to effectively prevent the overdrive condition of corresponding amplifying circuit.
The microwave output power showing an embodiment with reference to Fig. 2, Fig. 2 controls apparatus structure schematic diagram, as in figure 2 it is shown, above-mentioned microwave output power controls device can also include power supply 16, described power supply 16 connects described amplifying circuit 15, controller 17 respectively.
In the present embodiment, above-mentioned power supply 16 can be variable voltage source, if above-mentioned amplifying circuit 15 includes multiple amplifier, then power supply 16 can be connected each amplifier respectively.
If above-mentioned power supply 16 is variable voltage source, then can pass through to regulate the supply voltage of the voltage described amplifying circuit 15 of change of above-mentioned power supply 16, above-mentioned amplifying circuit 15 is made to always work at maximal efficiency state, can under the premise ensureing amplifying circuit job stability, realize the energy-conservation of corresponding microwave heating equipment, it is possible to effectively optimize corresponding microwave system. The output supply voltage of above-mentioned variable voltage source and microwave heating power one_to_one corresponding, regulate above-mentioned power supply 16 supply voltage size according to the size of microwave heating power. For example, it is possible to determine its corresponding relation according to the corresponding table between output supply voltage and the microwave heating power of variable voltage source.
In one embodiment, above-mentioned microwave output power controls device can also include temperature sensor, and described temperature sensor connects described controller;
Described controller detects the temperature of described amplifying circuit by described temperature sensor, when in the first Preset Time, the temperature of described amplifying circuit exceedes excess temperature threshold temperature the first preset times, control described attenuator circuit to regulate to maximum attenuation value, continue to detect the temperature of described amplifying circuit.
In the present embodiment, when controller temperature of described amplifying circuit in the first Preset Time exceedes excess temperature threshold temperature the first preset times, can report to the police, associated user is made to process according to the temperature anomaly situation to corresponding microwave heating equipment of reporting to the police, to improve the safety in above-mentioned microwave heating equipment work process.
Above-mentioned first Preset Time could be arranged to 2 seconds, it is also possible to is set to other values according to the actual performance of detected amplifying circuit; Above-mentioned first preset times could be arranged to 15, it is also possible to is set to other values according to the actual performance of detected amplifying circuit; Generally, above-mentioned excess temperature threshold temperature can be preset according to the performance of amplifying circuit.
As an embodiment, controller noted above detects the temperature of described amplifying circuit less than when recovering threshold temperature the second preset times in the second Preset Time, recovers the pad value of described attenuator circuit.
In the present embodiment, above-mentioned second Preset Time can be respectively set to 2 seconds, it is also possible to is set to other values according to the actual performance of detected amplifying circuit; Above-mentioned second preset times can be respectively set to 15, it is also possible to is set to other values according to the actual performance of detected amplifying circuit. Above-mentioned recovery threshold temperature can be preset according to the performance of amplifying circuit.
If above-mentioned first Preset Time and the second Preset Time are respectively set to 2 seconds, above-mentioned first preset times and the second preset times are respectively set to 15, then above-mentioned microwave output power control device by the process carrying out device overheat protector of said temperature sensor can be: default threshold temperature is stored in the memory element of controller, when detecting that in 2 seconds 15 temperature exceed excess temperature threshold temperature, the pad value of attenuating cable is regulated to maximum by controller, above-mentioned amplifying circuit can also be controlled quit work, the input microwave signal of above-mentioned amplifying circuit is not amplified, so that above-mentioned microwave output power control device is carried out overheat protector, controller can also send excess temperature alarm in modes such as display or warnings and remind user, after there is excess temperature alarm, if controller detects that in 2 seconds 15 temperature are less than when recovering threshold temperature, controller can control attenuator circuit and amplifying circuit return to overheat protector before microwave output power control the duty of device, namely control the pad value of attenuator circuit and return to the last adjustment by attenuator circuit to the pad value before maximum attenuation value, and make amplifying circuit return to the last time quit work before duty.
The present embodiment is by connecting temperature sensor by controller, the temperature of described amplifying circuit is detected by described temperature sensor, when in the first Preset Time, the temperature of described amplifying circuit exceedes excess temperature threshold temperature the first preset times, control described attenuator circuit to regulate to maximum attenuation value, continue to detect the temperature of described amplifying circuit, the temperature of described amplifying circuit is detected less than when recovering threshold temperature the second preset times in the second Preset Time, recover the pad value of described attenuator circuit, to realize above-mentioned microwave output power is controlled the overheat protector of device, above-mentioned microwave output power can be improved and control the safety of device work.
In one embodiment, above-mentioned microwave output power controls all right current sensor of device, and described current sensor connects described controller;
Described controller detects the electric current of described amplification circuit output end by described current sensor, detects described electric current when exceeding default threshold current value three preset times, send warning in the 3rd Preset Time.
In the present embodiment, above-mentioned 3rd Preset Time could be arranged to 2 seconds, it is also possible to is set to other values according to its concrete working environment; Above-mentioned 3rd preset times could be arranged to 15, it is also possible to is set to other values according to the actual performance of measured amplifying circuit; Generally, above-mentioned threshold current value could be arranged to 1.1 times of surveyed amplifying circuit load current value, it is also possible to presets according to the performance of surveyed amplifying circuit.
If above-mentioned 3rd Preset Time is set to 2 seconds, above-mentioned 3rd preset times is set to 15, then above-mentioned microwave output power control device by the process carrying out device overcurrent protection of above-mentioned current sensor can be: after detecting that in 2 seconds the electric current of 15 described amplification circuit output ends exceedes threshold current value, can report to the police, make relevant staff process accordingly according to above-mentioned warning, such as cut off the electricity supply etc.; The pad value of attenuator circuit can also be regulated to maximum by controller, controls amplifying circuit shutoff and does not work, and shows that on the panel of controller heating power abnormality alarming reminds user.
The present embodiment is by connecting current sensor by controller; the electric current of described amplification circuit output end is detected by described current sensor; to realize above-mentioned microwave output power is controlled the overcurrent protection of device, it is possible to improve above-mentioned microwave output power and control the safety of device work.
In one embodiment, above-mentioned microwave output power controls device can also include alarm, and described alarm connects described controller; Described alarm is for reporting to the police under the control of the controller.
In the present embodiment, controller noted above is connected alarm, the result that can be detected by the detecting instrument such as temperature sensor or current sensor according to controller, such as temperature is too high, and electric current is excessive etc., reports to the police accordingly, user is made to obtain the abnormality of the microwave heating equipment that above-mentioned detecting instrument detects in time, to process accordingly, it is ensured that the effect utilizing above-mentioned microwave heating equipment to be heated, improve the safety in above-mentioned microwave heating equipment use procedure.
In one embodiment, controller noted above can be also used for the standing-wave ratio of detection output microwave, if described standing-wave ratio exceedes default ratio, then regulates described attenuator circuit to maximum attenuation value.
Above-mentioned default ratio could be arranged to 10:1, it is also possible to is set to other values, generally, if above-mentioned microwave heating equipment is microwave oven, then above-mentioned standing-wave ratio is the standing-wave ratio in this microwave cavity. when not having accommodating food in its furnace chamber, or misplace other objects and enter in furnace chamber, such as metal bowl tool etc., when being heated, can there is load severe mismatch in microwave source, if now continuing heating, microwave oven will cause comparatively serious infringement, now just need the standing-wave ratio of microwave oven intracavity is detected, to ensure the safety of its work. when standing-wave ratio microwave oven intracavity being detected exceedes default ratio, described standing-wave ratio can also be detected when exceeding default ratio four preset times in the 4th Preset Time, the pad value of attenuator circuit can be regulated to maximum by controller, can also simultaneously by the gain-adjusted of amplifying circuit to minimum or turn off the work of described amplifying circuit, with to the protection realized above-mentioned microwave oven, the unusual condition of the standing-wave ratio of above-mentioned microwave oven intracavity can also be reported to the police by controller, associated user is made according to above-mentioned warning, the unusual condition of the standing-wave ratio of microwave oven intracavity to be processed accordingly.
In the present embodiment, above-mentioned 4th Preset Time could be arranged to 2 seconds, it is also possible to is configured according to the performance characteristics of corresponding microwave, and above-mentioned 4th preset times could be arranged to 15, it is also possible to is set to other values according to the applied environment of above-mentioned microwave heating equipment. The present embodiment, by the detection to output microwave standing wave ratio, if described standing-wave ratio exceedes default ratio, then regulates accordingly, it is possible to get rid of the unusual condition in microwave heating equipment work process.
In one embodiment, controller noted above can be also used for:
The pad value of described attenuator circuit is set to Gatt;
The heating power Pout and pad value Gatt of described microwave generation power P in, the gain G of amplifying circuit, microwave are substituted into the power control equation preset;
Solve described power control equation and obtain the size of described pad value Gatt;
The pad value of the size adjustment attenuator circuit according to described pad value Gatt.
Above-mentioned power control equation can be preset according to the feature of amplifying circuit and working environment thereof, such as, above-mentioned power control equation is preset as Gatt=Pin+k*G-Pout, wherein, k is the weighter factor of amplifying circuit, and it is equivalent that it can be set to 1,1.1 or 0.9 according to factors such as the numbers of amplifying circuit performance or its comprised amplifier.
As an embodiment, above-mentioned power control equation can be Pout=Pin-Gatt+G; Wherein, Pout is the heating power of microwave, unit is dBm (dBm), Pin is microwave generation power, unit is dBm (dBm), and Gatt is the pad value of attenuator circuit, and unit is dB (decibel), G is the gain of amplifying circuit, and unit is dB (decibel).
In the present embodiment, controller noted above can according to microwave generation power P in, the gain G of amplifying circuit, microwave heating power Pout determine the pad value of attenuator circuit, determined pad value makes microwave output power consistent with the heating power that user inputs according to concrete demand for heat, make the above-mentioned microwave output power will not along with microwave generation power variation, the stability of above-mentioned microwave output power can be improved, improve corresponding heats.
It show the microwave output power control method flow chart controlling device based on above-mentioned microwave output power of an embodiment with reference to Fig. 3, Fig. 3, comprise the steps:
S10, obtains the microwave generation power of microwave generator, the gain of amplifying circuit and microwave heating power;
Above-mentioned microwave generation power is power during microwave output power control microwave source generation microwave corresponding to device, its size can be determined according to the feature of corresponding microwave heating equipment, microwave heating equipment microwave generation power can be fixing, it is also possible to is adjusted according to the relevant setting of user. The heating power that above-mentioned microwave heating power can be inputted by microwave heating equipment according to its demand for heat for user.
S20, determines power difference according to described microwave generation power, the gain of amplifying circuit and microwave heating power;
In one embodiment, above-mentioned steps S20 may include that
Described microwave generation power, the gain of amplifying circuit and the heating power of microwave are substituted into the power control equation preset;
Solve described power control equation and obtain power difference.
Above-mentioned power control equation can be preset according to the feature of amplifying circuit and working environment thereof, such as, above-mentioned power control equation is preset as Gatt=Pin+k*G-Pout, wherein, Pout is the heating power of microwave, unit is dBm (dBm), Pin is microwave generation power, unit is dBm (dBm), Gatt power difference, unit is dB (decibel), G is the gain of amplifying circuit, unit is dB (decibel), k is the weighter factor of amplifying circuit, it can be set to 1 according to factors such as the numbers of amplifying circuit performance or its comprised amplifier, 1.1 or 0.9 is equivalent, meet * to represent and be multiplied.
As an embodiment, above-mentioned power control equation can be Pout=Pin-Gatt+G; Wherein, Pout is the heating power of microwave, unit is dBm (dBm), Pin is microwave generation power, unit is dBm (dBm), and Gatt is power difference, and unit is dB (decibel), G is the gain of amplifying circuit, and unit is dB (decibel).
In the present embodiment, according to microwave generation power P in, the gain G of amplifying circuit, microwave the determined power difference of heating power Pout be the pad value of respective attenuation circuit, the pad value of above-mentioned attenuator circuit is adjusted to above-mentioned power difference, microwave output power can be made consistent with the heating power that user inputs according to concrete demand for heat, and the microwave output power after regulating will not the change along with the change of microwave generation power, the stability of above-mentioned microwave output power can be improved, improve corresponding heats.
S30, regulates attenuator circuit according to described power difference, controls microwave output power.
The microwave output power control method that this utility model provides, by obtaining the microwave generation power of microwave generator, the gain of amplifying circuit and microwave heating power, determine corresponding power difference, and then adjustment attenuator circuit, to control corresponding microwave output power, make above-mentioned microwave output power can regulate respective attenuation circuit according to above-mentioned power difference to be controlled, it is not necessary to rely on the magnetron worked under environment under high pressure, it is possible to improve the safety controlling microwave output power; And in the control process of above-mentioned microwave output power, microwave output power will not change along with the change of above-mentioned microwave generation power, it is possible to improve the stability of microwave output power, to improve the heats of corresponding microwave heating equipment.
In one embodiment, above-mentioned microwave output power control method, it is also possible to including:
Utilize the temperature of temperature sensor detection amplifying circuit;
Whether the temperature detecting described amplifying circuit in the first Preset Time exceedes excess temperature threshold temperature the first preset times;
If so, then control described attenuator circuit to regulate to maximum attenuation value.
In the present embodiment, if the temperature of described amplifying circuit exceedes excess temperature threshold temperature the first preset times in the first Preset Time, illustrate that the temperature of now amplifying circuit occurs abnormal, can report to the police, associated user is made to process according to the temperature anomaly situation to corresponding microwave heating equipment of reporting to the police, to improve the safety in above-mentioned microwave heating equipment work process.
Above-mentioned first Preset Time could be arranged to 2 seconds, it is also possible to is set to other values according to the actual performance of detected amplifying circuit; Above-mentioned first preset times could be arranged to 15, it is also possible to is set to other values according to the actual performance of detected amplifying circuit; Generally, above-mentioned excess temperature threshold temperature can be preset according to the performance of amplifying circuit.
As an embodiment, above-mentioned microwave output power control method, it is also possible to including:
Utilize the temperature of temperature sensor detection amplifying circuit;
Whether the temperature of described amplifying circuit is detected less than when recovering threshold temperature the second preset times in the second Preset Time;
If so, the pad value of described attenuator circuit is then recovered.
In the present embodiment, above-mentioned second Preset Time can be respectively set to 2 seconds, it is also possible to is set to other values according to the actual performance of detected amplifying circuit; Above-mentioned second preset times can be respectively set to 15, it is also possible to is set to other values according to the actual performance of detected amplifying circuit. Above-mentioned recovery threshold temperature can be preset according to the performance of amplifying circuit.
If above-mentioned first Preset Time and the second Preset Time are respectively set to 2 seconds, above-mentioned first preset times and the second preset times are respectively set to 15, then above-mentioned microwave output power control device by the process carrying out device overheat protector of said temperature sensor can be: default threshold temperature is stored in the memory element of controller, when detecting that in 2 seconds 15 temperature exceed excess temperature threshold temperature, the pad value of attenuating cable is regulated to maximum by controller, above-mentioned amplifying circuit can also be controlled quit work, the input microwave signal of above-mentioned amplifying circuit is not amplified, so that above-mentioned microwave output power control device is carried out overheat protector, controller can also send excess temperature alarm in modes such as display or warnings and remind user, after there is excess temperature alarm, if controller detects that in 2 seconds 15 temperature are less than when recovering threshold temperature, controller can control attenuator circuit and amplifying circuit return to overheat protector before microwave output power control the duty of device, namely control the pad value of attenuator circuit and return to the last adjustment by attenuator circuit to the pad value before maximum attenuation value, and make amplifying circuit return to the last time quit work before duty.
The present embodiment utilizes temperature sensor to detect the temperature of described amplifying circuit, when in the first Preset Time, the temperature of described amplifying circuit exceedes excess temperature threshold temperature the first preset times, control described attenuator circuit to regulate to maximum attenuation value, continue to detect the temperature of described amplifying circuit, the temperature of described amplifying circuit is detected less than when recovering threshold temperature the second preset times in the second Preset Time, recover the pad value of described attenuator circuit, to realize the overheat protector to corresponding microwave heating equipment, the safety in upper microwave output power control process can be improved.
As an embodiment, the process that corresponding microwave heating equipment carries out overheat protector can be as shown in Figure 4, in Fig. 4, " Y " represents, " N " represents no: when the temperature of amplifying circuit exceedes excess temperature threshold temperature or less than when recovering threshold temperature, can report to the police, and utilize enumerator that above-mentioned alarm times is counted, utilizing the number of times that the temperature of amplifying circuit is exceeded excess temperature threshold temperature by excess temperature alarm counter to count, excess temperature recovers the enumerator temperature to amplifying circuit and counts less than the number of times recovering threshold temperature, first above-mentioned enumerator, excess temperature alarm counter and excess temperature are recovered enumerator to be zeroed out, and set excess temperature detection time 100ms (millisecond), within the excess temperature detection time, getting the warning message (alarm display) of alarm, enumerator adds 1, excess temperature flag bit is set, when excess temperature flag bit is 1, whether the temperature of detection amplifying circuit is less than recovering threshold temperature (excess temperature recovery thresholding), if, then excess temperature recovery enumerator adds 1, whether the temperature repeating above-mentioned detection amplifying circuit in time 100ms is detected less than the process recovering threshold temperature at above-mentioned setting excess temperature, after detection, judge that whether temperature recovers the counting of enumerator more than or equal to 15, if, then excess temperature flag bit is set to 0, and corresponding pad value coefficient (Vatt) is set to recover the pad value of described attenuator circuit, also recover the n-th amplifier, magnitude of voltage (the Vgs (n) of the (n-1)th amplifier, Vgs (n-1)), and remove corresponding alarm prompt, if temperature recovers the counting of enumerator less than 15, whether the value that then can determine whether enumerator is 20, if not, then continue counting, if, then return enumerator, excess temperature alarm counter and excess temperature recover the step that enumerator is zeroed out. when excess temperature flag bit is not 1, whether the temperature of detection amplifying circuit exceedes excess temperature threshold temperature (excess temperature thresholding), if, then excess temperature alarm counter adds 1, judge that whether the counting of excess temperature alarm counter is more than or equal to 15, if, then excess temperature flag bit is set to 1, and corresponding pad value coefficient (Vatt) is set so that the pad value of attenuator circuit is adjusted to maximum, also respectively by the n-th amplifier, magnitude of voltage (the Vgs (n) of the (n-1)th amplifier, Vgs (n-1)) it is set to the pinch-off voltage of respective amplifier, and carry out corresponding alarm prompt, if the counting of excess temperature alarm counter is less than 15, whether the value that then can determine whether enumerator is 20, if not, then continue counting, if, then return enumerator, excess temperature alarm counter and excess temperature recover the step that enumerator is zeroed out.
In one embodiment, above-mentioned microwave output power control method, it is also possible to including:
Current sensor is utilized to detect the electric current of described amplification circuit output end;
In the 3rd Preset Time, detect whether described electric current exceedes default threshold current value the 3rd preset times;
If so, warning is then sent.
In the present embodiment, above-mentioned 3rd Preset Time could be arranged to 2 seconds, it is also possible to is set to other values according to its concrete working environment; Above-mentioned 3rd preset times could be arranged to 15, it is also possible to is set to other values according to the actual performance of measured amplifying circuit; Generally, above-mentioned threshold current value could be arranged to 1.1 times of surveyed amplifying circuit load current value, it is also possible to presets according to the performance of surveyed amplifying circuit.
If above-mentioned 3rd Preset Time is set to 2 seconds, above-mentioned 3rd preset times is set to 15, then above-mentioned microwave output power control device by the process carrying out device overcurrent protection of above-mentioned current sensor can be: after detecting that in 2 seconds the electric current of 15 described amplification circuit output ends exceedes threshold current value, can report to the police, make relevant staff process accordingly according to above-mentioned warning, such as cut off the electricity supply etc.; The pad value of attenuator circuit can also be regulated to maximum by controller, controls amplifying circuit shutoff and does not work, and shows that on the panel of controller heating power abnormality alarming reminds user.
The present embodiment utilizes current sensor to detect the electric current of described amplification circuit output end, to realize the overcurrent protection to corresponding amplifying circuit and the microwave heating equipment of correspondence, it is possible to improve the safety in microwave output power control process.
As an embodiment, the process that corresponding microwave heating equipment carries out overcurrent protection can be as shown in Figure 5, in Fig. 5, " Y " represents, " N " represents no: when the electric current of amplification circuit output end exceedes default threshold current value, can report to the police, and utilize overcurrent alarm counter that above-mentioned alarm times is counted, the number of times that the electric current of amplification circuit output end is exceeded default threshold current value compared with number counter by current ratio is utilized to count, first by above-mentioned overcurrent alarm counter, current ratio relatively number counter is zeroed out, (electric current of an amplification circuit output end can be detected every 100ms when the electric current (current detection value) of amplification circuit output end exceedes default threshold current value (overcurrent threshold value) and whether exceed default threshold current value) again, current ratio relatively number counter adds 1, whether the electric current (current detection value) that can also detect amplification circuit output end further exceedes the electric current alarming threshold of amplifying circuit, if, then electric current alarm counter adds 1, determine whether that whether the counting of overcurrent alarm counter is be more than or equal to 15, if, corresponding pad value coefficient (Vatt) is then set so that the pad value of attenuator circuit is adjusted to maximum, also respectively by the n-th amplifier, magnitude of voltage (the Vgs (n) of the (n-1)th amplifier, Vgs (n-1)) it is set to the pinch-off voltage of respective amplifier, and by Display panel firepower abnormality alarming, if the counting of overcurrent alarm counter is less than 15, then judge current ratio is compared with whether the counting of number counter is 20, if, then return overcurrent alarm counter, the step that current ratio is zeroed out compared with number counter, if not, then return current detected value exceedes the step of corresponding overcurrent threshold value, if the electric current of amplification circuit output end (current detection value) is less than the electric current alarming threshold of amplifying circuit, then enters and judge that current ratio is compared with the step whether counting of number counter is 20.
In one embodiment, above-mentioned microwave output power control method can also include:
The standing-wave ratio of detection output microwave, and judge whether described standing-wave ratio exceedes default ratio;
If so, then described attenuator circuit is regulated to maximum attenuation value.
Above-mentioned default ratio can be configured according to the performance characteristics of corresponding microwave heating equipment, performance characteristics or in the consistent microwave heating equipment of relevant configuration, and default ratio corresponding to its standing-wave ratio is identical. above-mentioned default ratio could be arranged to 10:1, it is also possible to is set to other values, if above-mentioned microwave heating equipment is microwave oven, then above-mentioned standing-wave ratio is the standing-wave ratio in this microwave cavity. when not having accommodating food in its furnace chamber, or misplace other objects and enter in furnace chamber, such as metal bowl tool etc., when being heated, the object such as metal bowl tool being misplaced in furnace chamber is likely to microwave heating process is disturbed, and causes microwave source load mismatch, if now continuing heating, microwave oven will be caused comparatively serious infringement, now just need the standing-wave ratio of microwave oven intracavity is detected, to ensure the safety of its work. when standing-wave ratio microwave oven intracavity being detected exceedes default ratio, described standing-wave ratio can also be detected when exceeding default ratio four preset times in the 4th Preset Time, the pad value of attenuator circuit can be regulated to maximum by controller, can also simultaneously by the gain-adjusted of amplifying circuit to minimum or turn off the work of described amplifying circuit, with to the protection realized above-mentioned microwave oven, the unusual condition of the standing-wave ratio of above-mentioned microwave oven intracavity can also be reported to the police by controller, associated user is made according to above-mentioned warning, the unusual condition of the standing-wave ratio of microwave oven intracavity to be processed accordingly.
Above-mentioned 4th Preset Time could be arranged to 2 seconds, it is also possible to is configured according to the performance characteristics of corresponding microwave, and above-mentioned 4th preset times could be arranged to 15, it is also possible to is set to other values according to the applied environment of above-mentioned microwave heating equipment.
The present embodiment, by the detection to output microwave standing wave ratio, if described standing-wave ratio exceedes default ratio, then regulates accordingly, it is possible to get rid of the unusual condition in microwave heating equipment work process.
As an embodiment, owing to standing-wave ratio can be calculated by heating power and reflection power, reflection power threshold value can be exceeded by the corresponding reflection power of detection and exceed default ratio to detect standing-wave ratio, heating power can be preset, calculating reflection power size when output VSWR is 10:1, this value is just reflection power threshold value, if above-mentioned microwave heating equipment is microwave oven, it is possible to carry out the detection of corresponding standing-wave ratio by detecting the reflection power of microwave oven intracavity microwave, to prevent the load of corresponding microwave source that the situation of mismatch occurs. can be as shown in Figure 6 by detecting the process of reflection power prevention microwave source load mismatch, in Fig. 6, " Y " represents, " N " represents no: when the reflection power of microwave oven intracavity microwave exceedes reflection power threshold value, can report to the police, and utilize reflection power alarm counter that above-mentioned alarm times is counted, utilize reflection power to compare number counter reflection power exceedes the number of times of reflection power threshold value to count, first reflection power alarm counter is crossed by above-mentioned, reflection power compares number counter and is zeroed out, further according to default heating power, calculate reflection power size when output VSWR is 10:1, with this, reflection power threshold value is set, judge whether the detection time arrives 100ms (millisecond), if, then reflection power is compared number counter and add 1, determine whether that whether reflection power detected value is more than reflection power threshold value, if, then reflection power alarm counter adds 1, and judge that whether the counting of reflection power alarm counter is more than or equal to 15, if, corresponding pad value coefficient (Vatt) is then set so that the pad value of attenuator circuit is adjusted to maximum, also respectively by the n-th amplifier, magnitude of voltage (the Vgs (n) of the (n-1)th amplifier, Vgs (n-1)) it is set to the pinch-off voltage of respective amplifier, and by Display panel without abnormality alarmings such as real foods, if not, then judge that reflection power compares whether the counting of number counter is 20, if, then return and cross reflection power alarm counter by above-mentioned, reflection power compares the step that number counter is zeroed out, if not, then return according to presetting heating power, calculate reflection power size when output VSWR is 10:1, with this, the step of reflection power threshold value is set, if reflection power detected value is not more than reflection power threshold value, then enter the step judging that whether the counting that reflection power compares number counter is 20.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics is absent from contradiction, all it is considered to be the scope that this specification is recorded.
Embodiment described above only have expressed several embodiments of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope. It should be pointed out that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into protection domain of the present utility model. Therefore, the protection domain of this utility model patent should be as the criterion with claims.
Claims (10)
1. a microwave output power controls device, it is characterised in that including: microwave generator, attenuator circuit, amplifying circuit, controller; The input of described microwave generator, attenuator circuit and amplifying circuit is sequentially connected with, and described controller connects the control end of described microwave generator, attenuator circuit and amplifying circuit respectively;
Described microwave generator generation microwave, carries out attenuation processing by described attenuator circuit, exports microwave again through amplifying circuit after being amplified, and described controller controls microwave generator, attenuator circuit and amplifying circuit work respectively.
2. microwave output power according to claim 1 controls device, it is characterised in that described amplifying circuit includes n amplifier, and the first amplifier is sequentially connected with to the n-th amplifier; The input of described first amplifier connects described attenuator circuit, and the outfan of described n-th amplifier connects microwave outfan, and wherein, n is positive integer.
3. microwave output power according to claim 1 controls device, it is characterised in that also including power supply, described power supply connects described amplifying circuit and controller respectively.
4. microwave output power according to claim 1 controls device, it is characterised in that also include temperature sensor, and described temperature sensor connects described controller;
Described controller detects the temperature of described amplifying circuit by described temperature sensor, when in the first Preset Time, the temperature of described amplifying circuit exceedes excess temperature threshold temperature the first preset times, control described attenuator circuit to regulate to maximum attenuation value, continue to detect the temperature of described amplifying circuit.
5. microwave output power according to claim 4 controls device, it is characterised in that described controller detects the temperature of described amplifying circuit less than when recovering threshold temperature the second preset times in the second Preset Time, recovers the pad value of described attenuator circuit.
6. microwave output power according to claim 1 controls device, it is characterised in that also include current sensor, and described current sensor connects described controller;
Described controller detects the electric current of described amplification circuit output end by described current sensor, detects described electric current when exceeding default threshold current value three preset times, send warning in the 3rd Preset Time.
7. microwave output power according to claim 1 controls device, it is characterised in that also include alarm, and described alarm connects described controller; Described alarm is for reporting to the police under the control of the controller.
8. microwave output power according to claim 1 controls device, it is characterised in that described controller is additionally operable to the standing-wave ratio of detection output microwave, if described standing-wave ratio exceedes default ratio, then regulates described attenuator circuit to maximum attenuation value.
9. microwave output power according to claim 1 controls device, it is characterised in that described controller is additionally operable to:
The pad value of described attenuator circuit is set to Gatt;
The heating power Pout and pad value Gatt of described microwave generation power P in, the gain G of amplifying circuit, microwave are substituted into the power control equation preset;
Solve described power control equation and obtain the size of described pad value Gatt;
The pad value of the size adjustment attenuator circuit according to described pad value Gatt.
10. microwave output power according to claim 9 controls device, it is characterised in that described power control equation is Pout=Pin-Gatt+G; Wherein, Pout is the heating power of microwave, and Pin is microwave generation power, and Gatt is the pad value of attenuator circuit, and G is the gain of amplifying circuit.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105423366A (en) * | 2015-12-29 | 2016-03-23 | 京信通信技术(广州)有限公司 | Microwave output power control device and method |
| CN106413165A (en) * | 2016-10-31 | 2017-02-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave heating equipment, power control method thereof, and power control device thereof |
| CN106507525A (en) * | 2016-10-31 | 2017-03-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave firing equipment and its Poewr control method and output control device |
| CN106507524A (en) * | 2016-10-31 | 2017-03-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave firing equipment and its Poewr control method and output control device |
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2015
- 2015-12-29 CN CN201521133091.2U patent/CN205320319U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423366A (en) * | 2015-12-29 | 2016-03-23 | 京信通信技术(广州)有限公司 | Microwave output power control device and method |
| CN105423366B (en) * | 2015-12-29 | 2018-01-09 | 京信通信技术(广州)有限公司 | Microwave output power control device and method |
| CN106413165A (en) * | 2016-10-31 | 2017-02-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave heating equipment, power control method thereof, and power control device thereof |
| CN106507525A (en) * | 2016-10-31 | 2017-03-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave firing equipment and its Poewr control method and output control device |
| CN106507524A (en) * | 2016-10-31 | 2017-03-15 | 广东美的厨房电器制造有限公司 | Semiconductor microwave firing equipment and its Poewr control method and output control device |
| CN106507525B (en) * | 2016-10-31 | 2019-05-14 | 广东美的厨房电器制造有限公司 | Semiconductor microwave heating equipment and its Poewr control method and power control device |
| CN106413165B (en) * | 2016-10-31 | 2019-09-27 | 广东美的厨房电器制造有限公司 | Semiconductor microwave heating equipment and its Poewr control method and power control device |
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