CN1428541A - Thawing control device for microwave oven - Google Patents
Thawing control device for microwave oven Download PDFInfo
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- CN1428541A CN1428541A CN 01136918 CN01136918A CN1428541A CN 1428541 A CN1428541 A CN 1428541A CN 01136918 CN01136918 CN 01136918 CN 01136918 A CN01136918 A CN 01136918A CN 1428541 A CN1428541 A CN 1428541A
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- temperature
- compensating circuit
- infrared sensor
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Abstract
The defrosting control device for microwave oven includes: infrared sensor for detecting load temp. at the time of defrosting; comparator for judging that the temperature valve detected by said infrared sensor is high than the preset defrosting temperature or not; and the compensation circuit, if the detected load temperature is less than the preset defrosting temperature, it can compensate the load temperature to the preset defrosting temperature. The input end of the comparator is connected with signal input, its output end is connected with compensation circuit, another end of compensation circuit is connected to output end, the output end of infrared sensor is connected with input end of the comparator and directly connected to output end of compensation circuit respectively. It can accurately control defrosting time of food.
Description
Technical field
The present invention relates to a kind of thawing control device of micro-wave oven, relate to a kind of thawing control device specifically with program error in the system of thawing of hardware compensating micro-wave oven.
Background technology
Micro-wave oven typically refers to a kind of heater, wherein is immersed in food inside by the microwave of magnetron emission and finishes heating to food.In order to control the heating process of micro-wave oven more exactly, generally can adopt infrared sensor.Infrared sensor is with the temperature of infrared detection foodstuff surface, and this signal is sent to the microprocessor of being located at micro-wave oven inside.Microprocessor is according to the foodstuff surface temperature value that receives, the conditional parameter when whether decision is heated and heated.
The function of thawing is that micro-wave oven utilizes infrared sensor and controlled condition to nurse one's health one of function of food.The what is called function of thawing was meant before doing cooking, with foodization to uniform temperature, so that cook.
Utilized in the thawing control device of micro-wave oven of infrared sensor its course of defrosting as described below in the past:
At first, regulate required thawing time according to the weight and the kind of the food that will thaw.In the fixed thawing time sensing receiver be responsible for the temperature of detection load, control whole course of defrosting on this basis.
By the detected load temperature of infrared sensor, available following note equation compensates.Equation:
If Current Temperatures 〉=10
Current Temperatures=Current Temperatures-10 promptly, when the load temperature that is detected is 20 when spending, the Current Temperatures of load can be regarded as in the system of thawing is 10 degree, and controls according to this temperature value, that is to say to have compensated-10 degree.This is in order to compensate the error between detected temperature of sensor and actual temperature.
But, must at first satisfy aforesaid equation if will thaw control according to the temperature value after temperature compensated.That is, only be higher than 10 and just can finish the control thaw routine of micro-wave oven inside when spending at detected food temperature.
If thaw routine is normally carried out, and the normal detected temperatures signal of sensor and being sent in the system of thawing, the situations that load temperature is lower than 10 degree then can not appear.
But if program error or infrared sensor detection error take place, detected load temperature is lower than 10 degree, just can not satisfy aforesaid equation, and thaw routine can finish in advance.
That is to say that aforesaid equation is higher than under 10 situations about spending in load temperature only to be carried out.Therefore this thaw routine is set to and can't handles negative in addition, lacks than predefined thawing time when detected temperatures is lower than 10 actual thawing times when spending.
In a word, during the program error that in the past occurred in the thaw routine causing, can not accurately control thawing time, not reach the defrost result of expection by negative.This class problem can cause the discontented of consumer, and then influences the prestige of product.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of with the hardware compensating program error in the system of thawing, can be more exactly to the thawing control device of the thawed foodstuff of micro-wave oven.
The technical solution adopted in the present invention is as follows: a kind of thawing control device of micro-wave oven includes: the infrared sensor that is used to detect load temperature when thawing; Judge whether the detected temperature value of this infrared sensor is higher than the comparator of predefined thaw point; After comparator is judged, if detected load temperature is lower than predefined thaw point, with the compensating circuit of load temperature compensation to predefined thaw point, its annexation is: comparator go into termination signal input, output with link to each other with compensating circuit, the other end of compensating circuit is to output, and the output of infrared sensor connects the output of going into to hold and directly arrive compensating circuit of comparator respectively.
Advantage of the present invention is to be lower than 10 program errors that occur when spending in load temperature with hardware mode compensation, avoids in these cases that thaw routine finishes in advance, can control the thawing time to food more exactly.
Description of drawings
Fig. 1 is the circuit diagram block diagram of defreezing by microwave oven control device of the present invention
Fig. 2 is the circuit theory diagrams of defreezing by microwave oven control device of the present invention.
Fig. 3 is the performance plot that compensates in the micro-wave oven of the present invention by the detected temperature value of infrared sensor.Wherein: 1 compensating circuit 10a, 10b, 10c 10d diode 20 transistor 30a, 30b capacitor 40a, 40b, 40c, 40d, 40e resistance 50a, 50b comparator 60 infrared sensors
The specific embodiment
The thawing control device of micro-wave oven includes: the infrared sensor that is used to detect load temperature when thawing; Judge whether the detected temperature value of this infrared sensor is higher than the comparator of predefined thaw point; After comparator is judged, if detected load temperature is lower than predefined thaw point, with the compensating circuit of load temperature compensation to predefined thaw point, its annexation is: comparator go into termination signal input, output with link to each other with compensating circuit, the other end of compensating circuit is to output, and the output of infrared sensor connects the output of going into to hold and directly arrive compensating circuit of comparator respectively.
As shown in Figure 1, two diode 10a, 10d are parallel to power input, and the negative pole of two diode 10a, 10d is connected in the colelctor electrode of transistor 20.The base stage of transistor 20 is connected in outside control signal incoming end, and according to the control signal of outside, is in the opening/closing state, promptly is equivalent to the function of a switch, and the power supply that is input to above-mentioned colelctor electrode is sent to emitter stage.According to the control signal that is input to aforementioned base, select comparator 50a described later in use, the operation procedure of 50b promptly selects to set thaw routine according to user's conditioning.
The emitter stage of transistor 20 links to each other with the capacitor 30a of parallel connection and the end of resistance 40a, and is connected with the non-inverting input of the first comparator 50a by commutation diode 10b, and the other end ground connection of capacitor 30a and resistance 40a parallel connection.
When the user is set at 70,75 when spending with thaw point, whether the more detected load temperature of comparator 50a reaches and preestablishes temperature, if do not reach, then utilize the capacitor 30a that is connected in comparator 50a non-inverting input and resistance 40a compensation till reach design temperature.
The inverting input of comparator 50a links to each other with the non-inverting input of the second comparator 50b, and the output valve of two comparator 50a and 50b outputs to (not shown) on the microcomputer by diode 10c, also connects power Vcc by resistance 40d.
The non-inverting input of the second comparator 50b links to each other with resistance 40b with the capacitor 30b of parallel connection, but resistance 40b link node has connected the independent current source (Vcc) of the independent operating second comparator 50b by resistance 40c in addition, capacitor 30b in parallel and the other end ground connection of resistance 40b.
The inverting input of the second comparator 50b is connected in the infrared sensor 60 of micro-wave oven, if these infrared sensor 60 detected temperature are higher than and preestablish temperature, then its value directly exports microcomputer to by resistance 40e.That is, when infrared sensor 60 detected temperature were higher than predefined temperature, its value directly exported microcomputer to, if detected temperature is lower than predefined temperature, entered the inverting input of the second comparator 50b, and compensation is to preestablishing temperature.
Describe the course of action of the thawing control device of micro-wave oven of the present invention below in detail.
Defreezing by microwave oven control device among the present invention is divided into two thaw point set conditions.The firstth, the process of operational temperature 70,75 degree of the setting first comparator 50a, another one are to set the process of operating temperature 50 degree of the second comparator 50b.
If will start the second comparator 50b, then send low signal to the base stage of transistor 20, transistor 20 is adjusted to closed condition.This moment, the first comparator 50a did not start because of receiving signal, and the opposite second comparator 50b is by independent current source Vcc running.
That is, comparator 50a, the running of 50b is determined by the control signal of outside, and this control signal preestablishes according to required thaw point, and the first comparator 50a is used to detect 70,75 degree, and the second comparator 50b is used to detect specified temp 50 degree.
When beginning to start when thawing operation,, select comparator 50a, a comparator among the 50b according to weight or other condition of food.
The following describes the course of action of the first comparator 50a.
When thaw point is set at 70,75 when spending, the first comparator 50a comes into operation, and in order to start the first comparator 50a, but should be in the state of its non-inverting input received signal.That is, the control signal of outside input should be high signal, and this high signal inputs to the base stage of transistor 20, makes transistor 20 be in opening.Electric current is input to the colelctor electrode of transistor 20 after diode connected in parallel 10a, 10d rectification, when transistor 20 was in opening, the signal that inputs to transistor 20 colelctor electrodes can reach emitter stage in above-mentioned control procedure.By diode 10b, reach the compensating circuit that is made of capacitor 30a and resistance 40a through the signal of transistor 20, this compensating circuit fills signal in capacitor 30a, reaches after the certain numerical value output signal again.This signal passes to the non-inverting input of comparator 50a, comparator 50a output and the relative magnitude of voltage of thaw point 70,75 degree, and this magnitude of voltage is input to the positive pole of diode 10c.If the value that is input to diode 10c negative pole is less than the value that is input to its anode, then diode 10c is in opening state.The value that is input to the anode of diode 10c compensates the detected value of infrared sensor 60, and exports output to by diode 10c.This situation belongs to the detected value of infrared sensor 60 less than spending the correspondent voltage values with design temperature 70,75, and this moment, the value after compensation outputed on the microcomputer.
In a word, when the detected value of infrared sensor 60 during less than predefined temperature, output be the offset that is sent to the non-inverting input of the first comparator 50a, if the detected value of infrared sensor 60 then can directly be exported greater than preestablishing temperature 70,75 degree.
As shown in Figure 2, specified temp is set to 50 degree in foregoing circuit, and 50 reference voltages when spending are set to 1.9 volts.This performance plot is a benchmark with specified temp 50 degree, and the magnitude of voltage that is input to when above in the microcomputer is spent in expression less than 50 degree and 50.
At first, if the detected value of infrared sensor 60 is spent less than 50, then its value is connected to the capacitor 30b and the resistance 40b compensation of the second comparator 50b non-inverting input, to reach specified temp 50 degree.Be that above-mentioned detected value does not reach 50 when spending, can only obtain 1.5 volts of the voltages of independent current source Vcc, obtain 0.4 volt compensation at the compensating circuit of forming by capacitor 30b and resistance 40b then, to reach 1.9 volts of reference voltages.(A stage)
When load temperature is lower than 50 when spending, is input to voltage on the microcomputer and equals the actual load temperature and add 0.4 volt.
If above-mentioned infrared sensor 60 detected values are higher than 50 degree, then this value has had 1.9 volts of reference voltages, does not need to compensate in addition, does not therefore start the compensating circuit that is connected in the second comparator 50b, and the actual load temperature is directly inputted on the microcomputer.(B stage)
In a word, if load temperature is lower than 50 degree, compensating circuit is activated, and what be input to microcomputer is voltage under the 50 degree conditions, and load temperature is higher than 50 degree, does not then start compensating circuit, and the actual load temperature is directly inputted on the microcomputer.
Claims (3)
1. the thawing control device of a micro-wave oven is characterized in that including: the infrared sensor (60) that is used to detect load temperature when thawing; Judge whether the detected temperature value of this infrared sensor is higher than the comparator (50) of predefined thaw point; After comparator (50) is judged, if detected load temperature is lower than predefined thaw point, with the compensating circuit (1) of load temperature compensation to predefined thaw point, its annexation is: comparator (50) go into termination signal input, output with link to each other with compensating circuit (1), the other end of compensating circuit (1) is to output, and the output of infrared sensor (60) connects the output of going into to hold and directly arrive compensating circuit (1) of comparator (50) respectively.
2. the thawing control device of micro-wave oven according to claim 1 is characterized in that described compensating circuit (1) determines the predefined thaw point in this comparator (50).
3. the thawing control device of micro-wave oven according to claim 2, it is characterized in that possessing this comparator (50) and compensating circuit (1) more than two, according to comparator in two above comparators of selection signal enabling (50) of outside and the compensating circuit (1) and compensating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011369183A CN1299052C (en) | 2001-12-25 | 2001-12-25 | Thawing control device for microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011369183A CN1299052C (en) | 2001-12-25 | 2001-12-25 | Thawing control device for microwave oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1428541A true CN1428541A (en) | 2003-07-09 |
| CN1299052C CN1299052C (en) | 2007-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011369183A Expired - Fee Related CN1299052C (en) | 2001-12-25 | 2001-12-25 | Thawing control device for microwave oven |
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| Country | Link |
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| CN (1) | CN1299052C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003996A (en) * | 2009-08-29 | 2011-04-06 | 乐金电子(天津)电器有限公司 | Method for identifying shape, size, placing position and temperature of food in micro-wave oven |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE505555C2 (en) * | 1995-12-21 | 1997-09-15 | Whirlpool Europ | Method for controlling a heating process in a microwave oven and microwave oven |
| KR100275887B1 (en) * | 1997-11-14 | 2001-02-01 | 구자홍 | Method for compensating temperature of microwave oven |
| KR100366020B1 (en) * | 1999-07-12 | 2002-12-26 | 삼성전자 주식회사 | Defrosting method for a microwave oven |
| JP3351395B2 (en) * | 1999-07-19 | 2002-11-25 | 日本電気株式会社 | Flip chip forming method using chip tray |
| JP2001173961A (en) * | 2000-11-17 | 2001-06-29 | Sanyo Electric Co Ltd | Microwave oven |
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2001
- 2001-12-25 CN CNB011369183A patent/CN1299052C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003996A (en) * | 2009-08-29 | 2011-04-06 | 乐金电子(天津)电器有限公司 | Method for identifying shape, size, placing position and temperature of food in micro-wave oven |
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| Publication number | Publication date |
|---|---|
| CN1299052C (en) | 2007-02-07 |
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Granted publication date: 20070207 Termination date: 20111225 |