CN203240625U - Microwave oven and control device thereof - Google Patents
Microwave oven and control device thereof Download PDFInfo
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- CN203240625U CN203240625U CN 201220717536 CN201220717536U CN203240625U CN 203240625 U CN203240625 U CN 203240625U CN 201220717536 CN201220717536 CN 201220717536 CN 201220717536 U CN201220717536 U CN 201220717536U CN 203240625 U CN203240625 U CN 203240625U
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Abstract
The embodiment of the utility model discloses a control device and a microwave oven thereof. The control device comprises an acquirer arranged in a cooking cavity of the microwave oven, a processor and a magnetron control device, wherein the processor is used for receiving sampling interruption signals generated by a current food temperature digital signal and a current food humidity digital signal according to a preset period and responding the sampling interruption signals to control a fuzzy PID (Proportion Integration Differentiation) controller as well as controlling the circulation until the current temperature reaches a set temperature, the output end of the processor is connected with the fuzzy PID controller, the fuzzy PID controller calculates to obtain a digital controlled quantity according to a fuzzy PID algorithm, and the magnetron control device comprises a digital analog converter connected with the output end of the fuzzy PID controller, and a magnetron pulse controller connected with the output end of the digital analog converter. According to the embodiment of the utility model, the temperature control precision is increased, a preset heating effect can be obtained, and the use convenience is also improved.
Description
Technical field
The utility model relates to micro-wave oven control technology field, more particularly, relates to a kind of micro-wave oven control appliance and micro-wave oven.
Background technology
Micro-wave oven is a kind of modernization cooking kitchen range with microwave heating of food.Micro-wave oven is by power supply, magnetron, and the compositions such as control circuit, cooking cavity and waveguide, described waveguide is transferred to furnace chamber at control circuit with the microwave power that magnetron produces, with heat food.
Existing micro-wave oven control appliance is inputted the heating parameters such as cooking time, food species and weight based on the user for different foods at guidance panel, constantly grope to reach suitable heating-up temperature by the user.
Thereby there are the technological deficiency that heating control precision is poor and use is inconvenient in existing micro-wave oven control appliance and micro-wave oven.
The utility model content
In view of this, the utility model provides a kind of microwave control furnace apparatus and micro-wave oven, to realize improving micro-wave oven control accuracy and the convenient technical purpose of using.
On the one hand, the utility model embodiment discloses:
A kind of micro-wave oven control appliance comprises:
Collector: be arranged in the cooking cavity of described micro-wave oven;
Processor, be used for receiving sampling interrupt signal that current foodstuff temperature digital signal and current foodstuff humidity data signal produce, responding this sampling interrupt signal and control fuzzy controller according to predetermined period, and controlled circulation is until Current Temperatures reaches described design temperature, and the output of described processor is connected with fuzzy controller;
Described fuzzy controller, with described current foodstuff temperature and described current foodstuff humidity, and the design temperature that receives calculates digital control amount according to fuzzy PID algorithm;
The magnetron control device comprises:
The digital to analog converter that is connected with the output of described fuzzy controller is converted to the simulation controlled quentity controlled variable with described digital control amount;
And,
The magnetron pulse controller that is connected with the output of described digital to analog converter, described magnetron pulse controller obtains the analog pulse control signal with described simulation controlled quentity controlled variable pulse-width modulation PWM, and utilizes described analog pulse control signal to control described magnetron input power.
Alternatively:
Described collector comprises:
A plurality ofly be arranged at the cooking cavity inwall and over against the infrared temperature sensing device of rotating disc;
A plurality of described micro-wave oven steam vent humidity sensors on every side that are arranged at.
Alternatively:
Described infrared temperature sensing device comprises:
Infrared ray thermopile sensor, amplifying circuit, temperature-compensation circuit and low-pass filter circuit, wherein:
The output of described infrared ray thermopile sensor connects described amplifying circuit;
The output of described amplifying circuit connects described temperature-compensation circuit;
The output of described temperature-compensation circuit connects described low-pass filter circuit;
The output of described low-pass filter circuit connects the analog-digital converter that is connected with described processor interrupt pin.
Alternatively:
Described magnetron pulse controller comprises:
The pulse width modulation (PWM) chip that connects successively, zero triggers photoelectrical coupler chip and bidirectional thyristor, wherein:
The output of digital to analog converter connects described PWM chip;
Described zero triggers the described bidirectional thyristor of photoelectrical coupler chip drives.
Alternatively:
Described control appliance also comprises:
The liquid crystal display LCD circuit that is connected with described processor.
Alternatively:
Described control appliance also comprises:
The warning circuit that is connected with described processor.
Another aspect, the utility model embodiment discloses:
A kind of micro-wave oven comprises: microwave oven body, and, described micro-wave oven control appliance.
Can find out from above-mentioned technical scheme, the utility model embodiment is based on the setting of user to the temperature of wish heat food, and by gathering food temperature and humidity value, the magnetron input power that is used for heat food is controlled, the close-loop control mode of the utility model embodiment by constantly gathering, calculating and export, increased temperature controlled precision, simultaneously, the user need not rule of thumb to carry out the setting of food heat time heating time and mode of heating, can obtain default heating effect, also improve the convenience of using.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the disclosed a kind of control set in microwave oven structural representation of the utility model embodiment;
Fig. 2 is the disclosed a kind of control set in microwave oven middle infrared (Mid-IR) temperature sensing device structural representation of the another embodiment of the utility model;
Fig. 3 is magnetron pulse controller architecture schematic diagram in the disclosed a kind of control set in microwave oven of the another embodiment of the utility model;
Fig. 4 is the disclosed a kind of control set in microwave oven structural representation of the another embodiment of the utility model;
Fig. 5 is the disclosed a kind of microwave oven schematic diagram of the utility model embodiment.
The specific embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment discloses a kind of micro-wave oven control appliance and micro-wave oven, to realize improving micro-wave oven control accuracy and the convenient technical purpose of using.
Fig. 1 shows a kind of micro-wave oven control appliance, comprising:
Collector 11 is arranged in the cooking cavity of described micro-wave oven;
Described collector 11 comprises:
A plurality ofly be arranged at the cooking cavity inwall and over against the infrared temperature sensing device 111 of rotating disc;
Infrared temperature sensor since non-contact measurement form, anti-electromagnetic interference is highly sensitive and temperature-measuring range extensively is highly suitable for micro-wave oven elect magnetic field use.Need to prove, described to carry out the mode of current foodstuff temperature acquisition by infrared mode not unique, also can select the optical fiber measurement form.
Referring to Fig. 2 (showing a kind of control set in microwave oven middle infrared (Mid-IR) temperature sensing device), comprising:
Infrared ray thermopile sensor 1, amplifying circuit 2, temperature-compensation circuit 3 and low-pass filter circuit 4, wherein:
Because the thermoelectric pile output signal is subject to noise jamming, therefore need be connected in series again a low pass filter 4.
The output of described infrared ray thermopile sensor 1 connects described amplifying circuit 2;
The output of described amplifying circuit 2 connects described temperature-compensation circuit 3;
The output of described temperature-compensation circuit 3 connects described low-pass filter circuit 4;
The output of described low-pass filter circuit 4 connects the analog-digital converter that is connected with the interrupt pin of described processor 12.
In circuit application shown in Figure 2, the output temperature signal of infrared ray thermopile sensor 1 is under 25 ℃ of environment temperatures, food temperature to be measured is from 0 ℃～100 ℃, its output signal is-0.8mV～3.7mV, process and compensate with the compensating circuit signal for the signal that makes things convenient for subsequent conditioning circuit, therefore need the amplification with 1000 times in this signal work.
In the present embodiment, described amplifying circuit 2 comprises: 10 times of gain differential amplification and 100 gain homophases amplifications, because the output temperature signal of thermoelectric pile is very small, select to hang down the OP07 amplifier of drift, the drift of minimizing output signal.The output voltage of thermoelectric pile is a temperature signal, hot junction pin and cold junction pin with thermoelectric pile sees through the temperature signal that difference amplifier is read 10 times of amplifications first, be 100 times in-phase amplifier again via enlargement ratio with this signal, see through the cascade Enlargement Design of amplifier, the output signal of thermoelectric pile can be amplified 1000 times.
Signal after amplifying 1000 times is reduced load effect through 1 times of gain voltage emitter follower, difference amplifier and temperature-compensation circuit 3 signals that can also 1 times of gain be done temperature-compensating, and the purpose of described temperature-compensation circuit 3 is: in order to prevent because the Ring of thermopile sensor is subject to the drift of the output signal that impact causes of environment temperature.
In addition, for this circuit middle infrared (Mid-IR) thermopile sensor 1, the thermistor of an infrared ray thermopile sensor resistance in parallel is reached the purpose of linear revise, with nonlinear output voltage, change into linear output voltage; Can adopt simultaneously resistance bridge to do for the second time linear revise and do resistance to the conversion process of voltage, reach linear output voltage.
A plurality of described micro-wave oven steam vent humidity sensors 112 on every side that are arranged at.
During magnetron work, furnace chamber temperature rises, and relative humidity descends; Along with furnace chamber temperature continues to raise, water vapour is discharged from food, and relative humidity increases; When food approached boiling, relative humidity sharply rose.When initial relative humidity one timing, the moisture curve that different quantity of food is corresponding different, quantity of food is more, and the humidity rate of change when humidity begins to raise is less; Quantity of food is fewer, and the humidity rate of change is larger.Can identify what of quantity of food by the humidity rate of change.The density of different types of food, specific heat and dielectric loss are different, and the food large such as specific heat heats up slow, and the humidity rate of change is little, and heat time heating time is just long; The food that dielectric loss is large, the microwave energy of absorption is more, and the humidity rate of change is large, and heat time heating time is just short.Therefore, the rate of change of humidity depends primarily on kind and the quantity of food.
Need the food of heating using microwave generally all to contain moisture, when magnetron excited microwave to heat to food, moisture was evaporated from food, and discharges out of the furnace from air guide port.Therefore humidity sensor is contained near the micro-wave oven exhaust outlet, by detecting the variation of humidity in the furnace chamber, the humidity data signal is sent in the processor as an input quantity, and for carrying out the calculating of fuzzy quantity.
Need to prove, the humidity sensor in the present embodiment can be selected the sensor of direct output Digital Humidity signal.
Described processor 12 can preferentially be selected MCU, to reach the saving development cost, the technique effect of brief control appliance structure.Want the surface temperature of heated food and air humidity to determine initial value by the sensor detection; When driving magnetron according to the currency of predetermined period detecting sensor; If currency reaches preset temperature then stopped heating.
Described MCU is connected with crystal oscillating circuit, reset circuit, E2PROM circuit, I/O I/O port, reserves USB port and serial ports, illustrates no longer in detail herein;
Instruction design among the described MCU can be adopted modular design, be that whole control software is comprised of many independently little modules, and call execution by modular program, particularly, can comprise the compositions such as sampling module, fuzzy s operation control module, LCD display module.
Described fuzzy controller 13, with described current foodstuff temperature and described current foodstuff humidity, and the design temperature that receives calculates digital control amount according to fuzzy PID algorithm;
The described principle of calculating according to fuzzy PID algorithm comprises:
The sampled value of design temperature and current foodstuff temperature digital signal, current foodstuff humidity data signal is compared, obtain the accurate amount of deviation signal e, an input quantity as fuzzy controller, the accurate amount of deviation signal e is carried out obfuscation become fuzzy quantity, the fuzzy quantity of deviation e can represent with corresponding fuzzy language (if..then..), has obtained a subset of the fuzzy language set of deviation e
Again by the fuzzy subset
And fuzzy relation
Composition rule according to fuzzy reasoning carries out fuzzy decision, obtains fuzzy control quantity
For:
For controlled device being applied accurate control, also need fuzzy quantity
Thereby be converted to accurate amount output exact figure controlled quentity controlled variable; After through digital-to-analogue D/A conversion, become accurate pulse-triggered analog quantity driving zero triggering photoelectrical coupler chip and bidirectional thyristor work.
Described design temperature can preferably adopt the user to input by micro-wave oven man-machine interaction panel.
The magnetron control device comprises:
The digital to analog converter 141 that is connected with the output of described fuzzy controller is converted to the simulation controlled quentity controlled variable with described digital control amount;
In the present embodiment, described digital to analog converter can be selected the low-power consumption digital to analog converter of built-in buffer amplifier, but does not limit to.
And,
The magnetron pulse controller 142 that is connected with the output of described digital to analog converter, described magnetron pulse controller obtains the analog pulse control signal with described simulation controlled quentity controlled variable pulse-width modulation PWM, and utilizes described analog pulse control signal to control described magnetron input power.
In the present embodiment:
Food temperature is by the infrared ray thermopile sensor sensing of infrared temperature sensor, the temperature signal of thermoelectric pile is processed through signal, be differential amplification, cascade amplification, temperature end compensating, filtering processing etc., export an analog temperature signal, after the A/D change-over circuit, enter again processor; And humidity sensor is inputted described processor with the Digital Humidity signal.Described processor detects temperature, the humidity data of temperature, humidity sensor in the mode of inquiry, and carry out fuzzy (Proportion ratio, the Integration integration, the Differentiation differential) algorithm obtains digital control amount, output analog pulse triggering signal after the process digital-to-analogue conversion, drive bidirectional triode thyristor by zero-cross triggering circuit, thereby the input power of control magnetron reaches temperature automatically controlled purpose, stops above-mentioned loop control if currency reaches preset temperature.
Fig. 3 shows magnetron pulse controller in a kind of control set in microwave oven, comprising:
The pulse width modulation (PWM) chip 5 that connects successively, zero triggers photoelectrical coupler chip 6 and bidirectional thyristor 7, wherein:
The output of digital to analog converter 241 connects described PWM chip 5;
Described PWM chip is to utilize pulse modulation technology, by the driving of zero triggering photoelectrical coupler chip 6, the ON time of bidirectional thyristor (controllable silicon) 7 controlled, thus the heating power of change magnetron.
As the cycle be T in the time half cycle wave number of industrial-frequency alternating current be N, specified heating power is P during such as full conducting, then actual average heating power P
AveWith T in the cycle half cycle wave number n of actual conducting be directly proportional, be formulated as:
P
ave=(n/N)P。
Described zero triggers photoelectrical coupler chip 6 drives described bidirectional thyristor 7.
Simultaneously, described bidirectional thyristor also plays the isolation industrial-frequency alternating current to the interference of processor and connecting circuit.
Fig. 4 shows another control set in microwave oven, on the basis of Fig. 1 diagram and corresponding explanation thereof, also comprises:
The liquid crystal display LCD circuit 41 that is connected with described processor 12.
The warning circuit 42 that is connected with described processor 12.
Described liquid crystal display LCD circuit 41 is used for supporting to show that the temperature of current heating object and numerals such as estimating heat time heating time show.
Described warning circuit 42 is in order to prevent that endless loop from appearring in system heating excess Temperature or program, and described warning circuit is buzzer alarm circuit preferably.
Fig. 5 shows a kind of micro-wave oven, as shown in the figure:
In sum:
The utility model embodiment is based on the setting of user to the temperature of wish heat food, and by gathering food temperature and humidity value, the magnetron input power that is used for heat food is controlled, the close-loop control mode of the utility model embodiment by constantly gathering, calculating and export, increased temperature controlled precision, simultaneously, the user need not rule of thumb to carry out the setting of food heat time heating time and mode of heating, can obtain default heating effect, also improve the convenience of using.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation of the spirit or scope that do not break away from the utility model embodiment, realize in other embodiments.Therefore, the utility model embodiment will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a micro-wave oven control appliance is characterized in that, comprising:
Collector is arranged in the cooking cavity of described micro-wave oven;
The processor that input is connected with the output of described collector;
The described fuzzy controller that is connected with the output of described processor;
The magnetron control device comprises:
The digital to analog converter that is connected with the output of described fuzzy controller;
And,
The magnetron pulse controller that is connected with the output of described digital to analog converter.
2. micro-wave oven control appliance as claimed in claim 1 is characterized in that, described collector comprises:
A plurality ofly be arranged at the cooking cavity inwall and over against the infrared temperature sensing device of rotating disc;
A plurality of described micro-wave oven steam vent humidity sensors on every side that are arranged at.
3. micro-wave oven control appliance as claimed in claim 1 is characterized in that, described infrared temperature sensing device comprises:
Infrared ray thermopile sensor, amplifying circuit, temperature-compensation circuit and low-pass filter circuit, wherein:
The output of described infrared ray thermopile sensor connects described amplifying circuit;
The output of described amplifying circuit connects described temperature-compensation circuit;
The output of described temperature-compensation circuit connects described low-pass filter circuit;
The output of described low-pass filter circuit connects the analog-digital converter that is connected with described processor interrupt pin.
4. micro-wave oven control appliance as claimed in claim 1 is characterized in that, described magnetron pulse controller comprises:
The pulse width modulation (PWM) chip that connects successively, zero triggers photoelectrical coupler chip and bidirectional thyristor, wherein:
The output of digital to analog converter connects described PWM chip;
Described zero triggers the described bidirectional thyristor of photoelectrical coupler chip drives.
5. micro-wave oven control appliance as claimed in claim 1 is characterized in that, also comprises:
The liquid crystal display LCD circuit that is connected with described processor.
6. micro-wave oven control appliance as claimed in claim 1 is characterized in that, also comprises:
The warning circuit that is connected with described processor.
7. a micro-wave oven is characterized in that, comprising: microwave oven body, and, the described micro-wave oven control appliance of each claim of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717536 CN203240625U (en) | 2012-12-21 | 2012-12-21 | Microwave oven and control device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717536 CN203240625U (en) | 2012-12-21 | 2012-12-21 | Microwave oven and control device thereof |
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| CN203240625U true CN203240625U (en) | 2013-10-16 |
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| CN 201220717536 Expired - Lifetime CN203240625U (en) | 2012-12-21 | 2012-12-21 | Microwave oven and control device thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808708A (en) * | 2015-04-22 | 2015-07-29 | 重庆工商职业学院 | Method and system for self-adjusting fuzzy PID (Proportion Integration Differentiation) parameters in furnace temperature control system |
| CN106032960A (en) * | 2015-03-19 | 2016-10-19 | 青岛海尔智能技术研发有限公司 | Method for controlling refrigerator and refrigerator |
| CN108006721A (en) * | 2017-11-29 | 2018-05-08 | 广东美的厨房电器制造有限公司 | Control the method and cooking apparatus of cooking apparatus |
| CN108344002A (en) * | 2018-01-22 | 2018-07-31 | 中国地质大学（武汉） | A kind of portable assigned temperature HEATING INFRARED thermometric micro-wave oven |
| CN108826382A (en) * | 2018-03-27 | 2018-11-16 | 佛山市飞程信息技术有限公司 | A kind of microwave oven control system of automatic adjustment |
| CN109539333A (en) * | 2015-03-10 | 2019-03-29 | 松下知识产权经营株式会社 | Heating cooking device |
-
2012
- 2012-12-21 CN CN 201220717536 patent/CN203240625U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539333A (en) * | 2015-03-10 | 2019-03-29 | 松下知识产权经营株式会社 | Heating cooking device |
| CN109539333B (en) * | 2015-03-10 | 2020-06-19 | 松下知识产权经营株式会社 | Heating cooker |
| CN106032960A (en) * | 2015-03-19 | 2016-10-19 | 青岛海尔智能技术研发有限公司 | Method for controlling refrigerator and refrigerator |
| CN104808708A (en) * | 2015-04-22 | 2015-07-29 | 重庆工商职业学院 | Method and system for self-adjusting fuzzy PID (Proportion Integration Differentiation) parameters in furnace temperature control system |
| CN108006721A (en) * | 2017-11-29 | 2018-05-08 | 广东美的厨房电器制造有限公司 | Control the method and cooking apparatus of cooking apparatus |
| CN108344002A (en) * | 2018-01-22 | 2018-07-31 | 中国地质大学（武汉） | A kind of portable assigned temperature HEATING INFRARED thermometric micro-wave oven |
| CN108826382A (en) * | 2018-03-27 | 2018-11-16 | 佛山市飞程信息技术有限公司 | A kind of microwave oven control system of automatic adjustment |
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Granted publication date: 20131016 |