CN1299061C - Fire detection control circuit for microwave oven - Google Patents
Fire detection control circuit for microwave oven Download PDFInfo
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- CN1299061C CN1299061C CNB021532486A CN02153248A CN1299061C CN 1299061 C CN1299061 C CN 1299061C CN B021532486 A CNB021532486 A CN B021532486A CN 02153248 A CN02153248 A CN 02153248A CN 1299061 C CN1299061 C CN 1299061C
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- heater
- fire
- magnetron
- self
- microcontroller
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Abstract
The present invention provides a fire detection control circuit for a microwave oven, which comprises a heater, a magnetron, an automatic temperature regulating device, a microcontroller, a thermal cut-off fuse wire and an electric heating regulator, wherein the heater, the magnetron and the automatic temperature regulating device are mutually connected; when a fire occurs, the automatic temperature regulating device cuts off a power source supplied to the heater and the magnetron; the microcontroller controls the action of the heater and the magnetron; when a fire occurs, the thermal cut-off fuse wire cuts off the power source of the microcontroller; when a fire occurs, the electric heating regulator detects an abnormal voltage value and provides the abnormal voltage value to the microcontroller. When the automatic temperature regulating device or the thermal cut-off fuse wire or the electric heating regulator acts, product drive stops.
Description
Technical field
The present invention relates to micro-wave oven, relate in particular to the fire detection control circuit that detects fire that takes place in the micro-wave oven and the micro-wave oven of cutting off the electricity supply.
Background technology
Micro-wave oven is the device that utilizes the high frequency waves heated food generally speaking, be provided with magnetron in the electric field chamber of one side, the high frequency waves that generate in the magnetron can shine cooking room inside, plate on the floor of cooking room can be placed cooking-vessel, the dish motor that the bottom of plate is provided with can rotate plate, cooking-vessel on it rotates thereupon, makes the high frequency waves that shine cooking room can evenly be communicated to food inside and heats.
Micro-wave oven is divided into and only utilizes the high frequency waves defrosting food that generates in the magnetron or the simple function micro-wave oven of cooking and in the cooking room upper end heater or convection current fan are installed, and can carry out simultaneously except the cooking of high frequency waves that grill is cooked and the multifunction microwave oven of oven cook.
As shown in Figure 1, in the fire detection control circuit of the micro-wave oven of prior art: the supply power supply is communicated to power transformer T by power line, 2. 1 end 2 of the L of power line end and power transformer T number is connected, and the N of power line holds 2 times with power transformer T to hold 2. to be connected for No. 2.
1. 1. 1 end of power transformer T be connected with impedance R for No. 1 with 2 ends for No. 1, and impedance R is connected side by side with two capacitor C 1, C2 being connected in parallel, and first capacitor C 1 is connected with fuse F, and fuse F is connected with first switch SW 1.
1. first switch SW 1 is connected No. 1,1 time of high-tension transformer 120 end, and No. 2,1 end that second capacitor C 2 is connected high-tension transformer 120 2..2. 1. 1 end of high-tension transformer 120 be connected second switch SW2 with No. 2 No. 1 side by side.
2. first capacitor C 1 is connected No. 2,1 time of high-tension transformer 120 end, No. 2,1 end of first capacitor C 1 and high-tension transformer 2. between baking box self-operated thermostatic controller 60 and magnetron self-operated thermostatic controller 65 connect with the second relay R Y2.2 ends of high-tension transformer have connected magnetron 125.
Low heater 75 that is connected in series and low heater self-operated thermostatic controller 80, the first upper end heater 85 that is connected in series and the first upper end heater self-operated thermostatic controller 95, the second upper end heater 90 that is connected in series and the second upper end heater self-operated thermostatic controller 100 are connected in respectively between the fuse 10 and the second relay R Y2 side by side.
Control structures such as baking oven lamp that moves along with micro-wave oven and turntable motor are connected on the relay on the microcontroller.
The process of its action is: when the user inserts connector to the power line to product supply power supply, supply power supply by power line in circuit.Be input in No. 1,1 end of high-tension transformer 120 through first switch SW 1 behind 1 end of the AC power of supply by power transformer T.No. 1,1 end that is communicated to high-tension transformer 120 through baking box self-operated thermostatic controller 60 and magnetron self-operated thermostatic controller 65 and the second relay R Y 2 behind 2 ends of the AC power of supply by power transformer T 1. in, the power supply that is input to 1 end of high-tension transformer 120 is communicated to 2 ends of high-tension transformer 120, and the AC power of the high pressure that utilization is communicated to drives the magnetron 125 of micro-wave oven.
The power supply that is fed in the circuit is communicated to microcontroller, and microcontroller drives by heater 75,85,90 in order to drive the action of heater 75,85,90 control relay RY3, RY4, RY5.
When unusual overheated or fire that abnormal operation causes takes place during heater 75,85,90 drives, for detection case has been equipped with baking box self-operated thermostatic controller 60, when the generation abnormal operation caused overheated unusually or fire during magnetron 125 drove, for detection case is provided with magnetron self-operated thermostatic controller 65.
For example when the baking oven cooking take place unusual overheated when causing fire, prior art has possessed baking box self-operated thermostatic controller 60 and has carried out detection case, being baking box self-operated thermostatic controller 60 rises to 160 when spending when the unusual overheated temperature that causes, gets back to the operation closed condition after detecting this state.The power supply that is fed to product is cut off.
Paste or stickup face when breaking away from a little as the mistake of baking box self-operated thermostatic controller 60 in circuit, might can not carry out fire detection.Because of above-mentioned limitation, when carrying out the baking box self-operated thermostatic controller abnormality of fire detection control device, can not thoroughly detect unusual superheat state and cut off the electricity supply.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of formation a plurality of fire detection key elements, cuts off the fire detection control circuit of the micro-wave oven of the power supply of supply in the circuit in the fire detection controlling element during any one detection of fires.
For the technical solution problem, the technical solution used in the present invention is:
A kind of fire detection control circuit of micro-wave oven is provided, comprise and connect heater 75 separately, 85,90, magnetron 125, self-operated thermostatic controller 60,65,80,95,100, self-operated thermostatic controller 60,65,80,95,100 cut off when fire takes place to heater 75,85,90 and the power supply of magnetron 125 supply, the fire detection control circuit of this micro-wave oven also comprises the described heater 75 of control, 85,90 and the microcontroller 110 of the action of magnetron 125, cut off the disconnected fuse 70 of thermosol during breaking out of fire to the power supply of above-mentioned microcontroller 110, when taking place, fire detects the electro-hot regulator 115 that the abnormal voltage value provides to microcontroller 110, self-operated thermostatic controller 60,65,80,95,100, the thermosol fuse 70 that breaks, product drove and will stop when any one moved in the electro-hot regulator 115.
The invention has the beneficial effects as follows: take place unusually when overheated in micro-wave oven, the fire detection control device that possesses in the fire detection control circuit of micro-wave oven detects the unusual supply of cutting off the electricity supply after overheated, can prevent the fire generation.
Any one occurs when unusual in this fire detection control device, reserves the time and space of cutting off the electricity supply after the detection of fires for other fire detection control device, can improve the reliability of product action, can use safer.
Description of drawings
Fig. 1 is the fire detection control circuit of the micro-wave oven of prior art
Fig. 2 is the fire detection control circuit of micro-wave oven of the present invention
Fig. 3 is when putting into hamburger in the pot of micro-wave oven, an embodiment of detection of fires.
Fig. 4 is when putting into edible oil in the pot of micro-wave oven, an embodiment of detection of fires.
Explanation to the symbol of the major part of drawing:
60: the self-operated thermostatic controller 65 of baking box: the self-operated thermostatic controller of magnetron
70: the hot melt fuse 75 that breaks: low heater
80: low 85: the first upper end heaters of heater self-operated thermostatic controller
The self-operated thermostatic controller of 95: the first upper end heaters of 90: the second upper end heaters
The self-operated thermostatic controller 110 of 100: the second upper end heaters: microcontroller
115: electro-hot regulator 120: high-tension transformer
125: magnetron RY2-RY13: relay
V.M: ventilation motor
The specific embodiment
Be described in further detail below in conjunction with the fire detection control circuit of the drawings and specific embodiments micro-wave oven of the present invention:
As shown in Figure 2, the L1 of power line end is connected with baking box self-operated thermostatic controller 60, and baking box self-operated thermostatic controller 60 is connected with magnetron self-operated thermostatic controller 65.Magnetron self-operated thermostatic controller 65 is connected in series with the fuse F and first switch SW 1, and first switch SW 1 is connected 1 end of high-tension transformer 120 and 1. goes up for No. 1, and 2 ends of high-tension transformer 120 are connected with magnetron 125.
The N of power line end is connected for No. 2 with 1 end of high-tension transformer 120, and the N of power line holds and 1 time of high-tension transformer 120 is held and formed microcontroller 110 between 2. No. 2.
Connect between the intermediate point of connection baking box self-operated thermostatic controller 60 and the N end on the L1 end of power line and constituted low heater self-operated thermostatic controller 80 and low heater 75.Between the intermediate point of connection baking box self-operated thermostatic controller 60 and the N end ventilation motor V.M has been installed on the N end of power line.
Connected the 9th relay R Y9 on the low heater 75, low heater 75 is connected with the 3rd trigger triode TR IAC3.The 3rd trigger triode TRIAC3 is connected with the tenth relay R Y10.Ventilation motor V.M is connected with the 6th relay R Y6, the 7th relay R Y7, the 8th relay R Y8 respectively.
The L2 end of power line is connected with the second upper end heater 90 with the first upper end heater 85 respectively.The first upper end heater 85 is connected with the first upper end heater self-operated thermostatic controller 85, and the first upper end heater 90 is connected with the second upper end heater self-operated thermostatic controller 100.The first upper end heater self-operated thermostatic controller 95 is connected with the second trigger triode TRIAC2, and the second upper end heater self-operated thermostatic controller 100 is connected with the first trigger triode TRIAC1.The first upper end heater self-operated thermostatic controller 95 is connected with the 11 relay R Y11, and the second upper end heater self-operated thermostatic controller 100 is connected with the 13 relay R Y13.
Connect the disconnected protector 70 of hot melt between No. 2, fuse F and high-tension transformer 120 1 time end, connected power transformer T between No. 2,1 end of disconnected protector 70 of hot melt and high-tension transformer 120.Power transformer T is connected microcontroller 110, and electro-hot regulator 115 is connected on the microcontroller 110.
The course of action concrete condition is: when the user was inserted into connector to power line, power supply was fed in the circuit, and promptly when the L1 of power line supply power supply, power supply is communicated to magnetron self-operated thermostatic controller 65 by baking box self-operated thermostatic controller 60.By the power supply of magnetron self-operated thermostatic controller 65, be communicated to the disconnected fuse 70 of hot melt through fuse F again, be communicated to then on the power transformer T.AC power converts dc source to by power transformer T, is communicated to microcontroller 110 again, and microcontroller 110 is communicated to power supply on the product.
No. 1,1 end that power supply by magnetron self-operated thermostatic controller 65 is communicated to high-tension transformer 120 through fuse F and first switch SW 1 1..To the N of power line end input power supply, No. 2,1 end that power supply is communicated to high-tension transformer 120 2. when power line was inserted connector.Be communicated to high-tension transformer 120 as power supply, be communicated to magnetron 125 after the AC power by high-tension transformer 120 converts high-voltage dc power supply to, drive by the magnetron 125 of accepting voltage.
The power supply that is input to the L1 end of power line is communicated to the low heater 75 that is arranged on the turntable downside in the pot by low heater self-operated thermostatic controller 80.Input power supply on the L2 end of power line, power supply are fed to and hang down relay R Y9, RY10 that heater 75 is connected and trigger triode TRIAC3 etc.In order to make low heater 75 carry out that the 9th relay R Y9, the tenth relay R Y10 etc. carry out run action shown in the action diagram 2.
The power supply that is input to the L2 end of power line is communicated to the first upper end heater self-operated thermostatic controller 95 and the second upper end heater automatic heater 100 that is arranged on the upside in the pot, and the first upper end heater self-operated thermostatic controller 95 of accepting power supply is connected with the second upper end heater 90 with the first upper end heater 85, the second upper end heater self-operated thermostatic controller 100.
Power supply to the input of the L1 of power line end is communicated to blower motor V.M, moves simultaneously when heater 85,90 is driven, and the 6th relay R Y6, the 7th relay R Y7, the 8th relay R Y8 etc. carry out switch motion.
In heater and the driven by magnetron, in situations such as the carrying out of the display unit output cooking or end, microcontroller 110 control output signals.
When heater 75,85,90 that drives or magnetron 125 were carried out under the situation of the cooking breaking out of fire, at first heater self-operated thermostatic controller 80,95,100 or magnetron self-operated thermostatic controller 65 detected.Heater self-operated thermostatic controller 80,95,100 or magnetron self-operated thermostatic controller 65 disconnect when detecting fire, cut off the power supply to power transformer T supply.
Heater self-operated thermostatic controller 80,95,100 or magnetron self-operated thermostatic controller 65 occurs bad or pastes bad causing can not detection of fires the time, and the disconnected fuse 70 of the hot melt of the front end setting of power transformer T reaches disconnection when above of institute's fixed temperature.The disconnected fuse 70 of hot melt disconnected when for example temperature reached more than 230 ℃ after the breaking out of fire.Cut-out equals to cut off the power supply supply of passing on to microcontroller 110 to the power supply of power transformer T supply.
When the disconnected fuse 70 of heater self-operated thermostatic controller 80,95,100 or magnetron self-operated thermostatic controller 65 or hot melt all can not detection of fires, finally be connected electro-hot regulator 115 detection of fires of microcontroller 110.That is electro-hot regulator 115 detected when, breaking out of fire changed flare in the pot.Electro-hot regulator 115 is communicated to microcontroller 110 according to the voltage of the temperature correlation that detects.The voltage that detects according to top situation microcontroller 110 rises when surpassing the normal value upper voltage limit, judges in the pot fire has taken place.
For example in microcontroller 110 during the voltage 3.2V of input, the microcontroller 110 of accepting voltage is judged as fire has taken place, stopping of microcontroller 110 control heaters and driving magnetron in view of the above, and control shows fire signal by display unit.
Comprised baking box self-operated thermostatic controller or heater self-operated thermostatic controller among the present invention and append disconnected fuse of hot melt and electro-hot regulator have been installed, when wherein any one detects fire, all can cut off the electricity supply.
As shown in Figure 3, when carrying out taking place in the cooking of hamburger unusual overheated or fire in the pot of micro-wave oven, after heat in 27 fens fusing fuse 70 detects, and the disconnected fuse 70 of hot melt becomes off-state, cuts off the power supply to the product supply.
When unusual or setup error appear in the disconnected fuse 70 of hot melt, can not detection of fires.When fire is proceeded in the pot of micro-wave oven, 27 minutes 27 seconds electro-hot regulator 115 detection of fires.Electro-hot regulator 115 is passed on abnormal voltages to microcontroller 110 when being breaking out of fire, and the microcontroller 110 of accepting voltage signal is judged after the fire situations control relay RY6, RY7, RY8, RY9, RY 10, RY11, RY12, RY13 for the driving that stops heater 80,95,100.Microcontroller is controlled the second relay R Y2 for the driving that stops magnetron 125 after judging the fire situation, and microcontroller 110 is in order to allow the user confirm that fire takes place, at display unit output fire signal.
Electro-hot regulator 115 loading errors or occur when bad, normally detection of fires.When after this fire is proceeded to reach 28 minutes and 10 seconds kettle temperature reach institute's fixed temperature when above first and second heater self-operated thermostatic controller 95,100 detect the fire that takes place in taking the dish out of the pot.For relay R Y11, the RY12 of heater, RY13 disconnects and microcontroller 110 is controlled, its result prevents to heater 75,85,90 power supplies, instant heating fusing fuse 70, electro-hot regulator 115, when heater self-operated thermostatic controller 95,100 detects to go out fire, in final baking box self-operated thermostatic controller 60 detects pot whether fire has taken place.During breaking out of fire, baking box self-operated thermostatic controller 60 disconnects, and fundamentally cuts off and supply power supply in product in the pot.
As shown in Figure 4, when putting into edible oil and cook breaking out of fire in the pot of micro-wave oven, as shown in Figure 4, first upper end heater self-operated thermostatic controller 95 detection of fires disconnect after 7 minutes.When the first upper end heater self-operated thermostatic controller 95 did not detect in the circuit unusual overheated or fire because of abnormality causes, the disconnected fuse 70 of hot melt disconnected after 7 minutes and 14 seconds, cut off the power supply that flow into power transformer T.The disconnected fuse 70 of illustrated hot melt detects among Fig. 2, and the disconnected fuse 70 of hot melt becomes off-state then, cuts off the power supply to the product supply.
When unusual or setup error appear in the disconnected fuse 70 of hot melt, can not the interior overheated or fire of testing circuit.Time remaining to 7 is in the times of minutes 27 seconds, and electro-hot regulator 115 detects the voltage that fire causes.
The voltage that causes of the fire that detects of electro-hot regulator 115 is to microcontroller 110 reception and registration then, the microcontroller 110 of accepting voltage signal judges in the pot fire has taken place that microcontroller 110 is control relay RY6, RY7, RY8, RY9, RY10, RY11, RY12, RY13 for the driving that stops heater 80,95,100.Microcontroller 110 is in order to allow the user confirm that fire takes place, at display unit output fire signal.
Electro-hot regulator 115 loading errors or occur bad when causing normally detection of fires, the fire that baking box self-operated thermostatic controller 60 detects in the pot, baking box self-operated thermostatic controller 60 disconnects after 9 minutes and 3 seconds, cuts off the power supply of supplying in product.
Be that micro-wave oven during breaking out of fire, constitutes a plurality of fire detection control device of cutting off the electricity supply after detecting according to the present invention in driving, when any one at first detected fire in the fire detection control device, cutting off the electricity supply was supplied as basic technical thought.
So right of the present invention is the restriction that is not subjected to the case study on implementation that illustrates, define according to the content of putting down in writing in the application range, those of ordinary skill can be carried out various deformation and change is that a matter of course is real in the interest field of application record in the field of the invention.
Claims (1)
1. the fire detection control circuit of a micro-wave oven, comprise heater, magnetron, self-operated thermostatic controller, described self-operated thermostatic controller cuts off the power supply to described heater and magnetron supply when fire takes place, it is characterized in that: the fire detection control circuit of described micro-wave oven also comprises the described heater (75 of control, 85,90) and the microcontroller (110) of magnetron (125), can cut off the disconnected fuse (70) of hot melt of described microcontroller (110) power supply during breaking out of fire, the abnormal voltage value that detects is offered the electro-hot regulator (115) of described microcontroller (110), described self-operated thermostatic controller (60,65,80,95,100), the hot melt fuse (70) that breaks, product drove and will stop when any one moved in the electro-hot regulator (115).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021532486A CN1299061C (en) | 2003-01-10 | 2003-01-10 | Fire detection control circuit for microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021532486A CN1299061C (en) | 2003-01-10 | 2003-01-10 | Fire detection control circuit for microwave oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1515831A CN1515831A (en) | 2004-07-28 |
| CN1299061C true CN1299061C (en) | 2007-02-07 |
Family
ID=34235047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021532486A Expired - Fee Related CN1299061C (en) | 2003-01-10 | 2003-01-10 | Fire detection control circuit for microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1299061C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123029A (en) * | 1982-01-16 | 1983-07-22 | Sanyo Electric Co Ltd | Oven range |
| US5170024A (en) * | 1990-03-28 | 1992-12-08 | Sharp Kabushiki Kaisha | Heat cooking apparatus with photoconductive element and thermistor |
| JP2000018594A (en) * | 1998-06-29 | 2000-01-18 | Toshiba Corp | Microwave oven |
| KR20010055710A (en) * | 1999-12-11 | 2001-07-04 | 구자홍 | Method for fire prevention in microwave oven |
| KR20020022952A (en) * | 2000-09-21 | 2002-03-28 | 윤종용 | Microwave oven and controlling method there of |
-
2003
- 2003-01-10 CN CNB021532486A patent/CN1299061C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123029A (en) * | 1982-01-16 | 1983-07-22 | Sanyo Electric Co Ltd | Oven range |
| US5170024A (en) * | 1990-03-28 | 1992-12-08 | Sharp Kabushiki Kaisha | Heat cooking apparatus with photoconductive element and thermistor |
| JP2000018594A (en) * | 1998-06-29 | 2000-01-18 | Toshiba Corp | Microwave oven |
| KR20010055710A (en) * | 1999-12-11 | 2001-07-04 | 구자홍 | Method for fire prevention in microwave oven |
| KR20020022952A (en) * | 2000-09-21 | 2002-03-28 | 윤종용 | Microwave oven and controlling method there of |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1515831A (en) | 2004-07-28 |
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