CN1250860A - Numerally controlled microwave oven with continuously adjustable power - Google Patents
Numerally controlled microwave oven with continuously adjustable power Download PDFInfo
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- CN1250860A CN1250860A CN 98123503 CN98123503A CN1250860A CN 1250860 A CN1250860 A CN 1250860A CN 98123503 CN98123503 CN 98123503 CN 98123503 A CN98123503 A CN 98123503A CN 1250860 A CN1250860 A CN 1250860A
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Abstract
The name of the present invention is numerically controlled-power continuously adjustable microwave oven, belonging to the field of electric appliance technology. Said invented technical scheme is characterized by that its magnetron filament transformer and cavity voltage transformer are separated, and an intelligent voltage-regulating circuit board is added in primary part of cavity voltage transformer, so that the power of microwave oven can be continuously regulated, and at the same time, the magnetron life also can be raised, and its cooking effect is good. Said invention is simple, and easy to implement and popularize.
Description
Title of the present invention is a numerally controlled microwave oven with continuously adjustable power, belongs to technical field of electric appliances.
The microwave power of existing micro-wave oven is not continuously adjustable, and it is to utilize the break-make of relay control magnetron working power to control the ratio of full power transmissions time and off-air time, reaches the purpose of adjusting power indirectly.This method makes magnetron be in switch working state, has reduced the working life of magnetron, and this control method is coarse simultaneously, and cooking heating is inhomogeneous, and effect is bad, is not easy to existing micro-wave oven is carried out intellectualized reconstruction, influences model change.
The objective of the invention is to design a kind of numerally controlled microwave oven with continuously adjustable power, by export the elementary input voltage of contactless continuous control magnetron cavity voltage transformer with numeral, and keep filament voltage constant, can to the total power scope, carry out continuous control zero to the size of magnetron microwave power.Improve the magnetron working life simultaneously, make cooking homogeneous heating.
Technology constitutes: the present invention is on existing micro-wave oven basis, with magnetron heater transformer and chamber voltage transformer branch be arranged (being originally a transformer), increase an intelligent pressure regulating circuit board (6) in the chamber primary, as Fig. 1, Fig. 2, shown in Figure 4, the chamber voltage of magnetron (2) is by chamber voltage transformer (4-T
2) provide, its elementary (former limit) controlled by an intelligent pressure regulating circuit board (6).Fig. 3 is the physical circuit figure of circuit board.Filament voltage is by magnetron heater transformer (5-T
4) provide, magnetron (2) is freezed by electric fan (3).
Intelligent pressure regulating circuit board (6) is installed in the microwave cabinet (Fig. 5), and it is to be made of zero cross detection circuit, single chip machine controlling circuit, three parts of bidirectional triode thyristor circuits for triggering, and wherein zero cross detection circuit is by T
3, U
5(LM339), U
3(74LS123) and U
2(74LSO2) constitute, input signal is that (220V is 50HZ) through transformer T for industrial-frequency alternating current
3Become interchange 5V, again by voltage comparator U
5(LM339) form the square wave of 180 ° of pulsewidths, square wave leads to monostable circuit U respectively
3(74LS123) two are triggered on the input 2 and 9, just in output of output 13,5 ends and the corresponding positive and negative pulse train of positive and negative zero passage, again through U
2(74LSO2) nor gate forms and the corresponding negative pulse sequence of a plurality of zero crossings, as the zero cross fired signal, delivers to AT89C51 external interrupt INT
0End.In addition, also can finish with other circuit.
Single chip machine controlling circuit comprises U
4(89C51), operating key and display circuit three parts, operating key is by S
1, S
2, S
3And U
6(74LS125) constitute, display circuit is by U
8(7218B), U
1(74LS32) constitute with three LED.Power setting is with three key S
1, S
2, S
3Finish the adjustable continuously of 0～999W (or more high power) full power, S
1Be used for being provided with hundred, ten, individual position of power, the options button of ascending the throne, its function is to click to show hundred bit value and flicker, clicks to show ten digit value and flicker again, click again to show units value and flicker, and the like.S
2Be to increase key, the position that promptly clicks flicker adds 1, S
3Be to reduce to be good for, the position that promptly clicks flicker subtracts 1, uses U simultaneously
8(7218B) drive three LED common cathode charactrons and show instantaneous power.Three keys all have pull-up resistor R
10, R
11, R
12, be high-voltage state at ordinary times, when key is pressed, the INT of 89C51
1The end output LOW voltage.After configuring heating power, click the beginning key, AT89C51 postpones the corresponding time at P just according to the constant that sets in advance in the timer
3-4[14 pin, T
0] negative pulse of end output certain width.
The bidirectional triode thyristor circuits for triggering are by U
9(7406), N
2(9013), O
2(MOC3021), T
5, T
2, constitute, work as P
3-4(T
0) when holding output low level, drive circuit U
9(7406) output high level, switching tube N
2(9013) conducting, the input of photoelectrical coupler 02 (MOC3021) have the electric current input, and the bidirectional triode thyristor conducting of output triggers outside bidirectional triode thyristor T
5Conducting.Work as P
3-4(T
0) when end is exported high level, switching tube U
2(9013) end photoelectrical coupler U
2(MOC3021) bidirectional triode thyristor of output turn-offs, outside bidirectional triode thyristor T
5Also turn-off.When changing heating power, time delay, bidirectional triode thyristor T
5The angle of flow also change thereupon, output voltage is changed continuously.
Fig. 4 is the control panel of microwave oven schematic diagram, (8) be newly-increased part panel, top rectangle frame (10) is a display window, be used for showing instantaneous power, 1,2,3 three operating key is arranged at the bottom, and No. 1 key is hundred, ten, the individual position that power is set, the options button of ascending the throne, No. 2 keys are to increase key, and No. 3 keys are to reduce key.Below newly-increased part panel (8) the time showing window that has on the former panel, beginning button, time set key etc.
Fig. 5 is micro-wave oven transformer, Based Intelligent Control Board position schematic diagram.Magnetron cavity transformer (4-T
2), magnetron heater transformer (5-T
4) and Based Intelligent Control plate (6) be installed in the cabinet of control panel (7) back.
The present invention can make the power of micro-wave oven adjustable continuously in gamut, enjoy the working life of transferring homogeneous heating, having improved magnetron, improved the P/C ratio of product simultaneously greatly, product is convenient to upgrading.
Description of drawings
Fig. 1: numerally controlled microwave oven with continuously adjustable power
Fig. 2: control principle figure
Fig. 3: intelligent pressure regulating circuit board line figure
Fig. 4: control panel of microwave oven schematic diagram
Fig. 5: micro-wave oven transformer Based Intelligent Control Board position schematic diagram
Wherein:
1---ripple stove casing 2---keyholed back plate 3---electric fan
4---magnetron cavity voltage transformer (T
2) 5---magnetron heater transformer (T
4)
6---energy regulating circuit plate 7---control panel of microwave oven
8---newly-increased part panel 9---fire door 10---power display windows
List of references
1. Lee's micro-wave oven in good year and publishing house of technology Beijing Normal University 1994.6
2. surplus single-chip microcomputer and the household electrical appliance intellectualized technology Electronic Industry Press 1995.1 of weighing forever
3. scholar Lee bravely waits the fuzzy control Intelligent Control Theory and uses publishing house of Harbin Institute of Technology 1990.12
4. Piao Yuan heptan (Korea S) power relay of microwave oven control method 1997.5.14
5. metallographic town Jiang Xingda (Korea S) power control device for microwave oven 1997.5.14
6. palace Ben Longshi (Japan) micro-wave oven 1997.8.13
Claims (3)
1. a numerally controlled microwave oven with continuously adjustable power made from magnetron is characterized in that magnetron heater transformer [5-T
4] and chamber voltage transformer [4-T
2] divide and to be arranged chamber voltage transformer [T
2] elementary input voltage use intelligent pressure regulating circuit board [6] to control, the power demonstration is finished by newly-increased part panel [8].
2. according to the said numerally controlled microwave oven with continuously adjustable power of claim 1, it is characterized in that said intelligent pressure regulating circuit board [6]:
(1) is a rectangular printed IC board, is installed in the casing of control panel of microwave oven [7] back, in magnetron heater transformer back;
(2) be made of zero cross detection circuit, single chip machine controlling circuit, three parts of bidirectional triode thyristor circuits for triggering, wherein zero cross detection circuit is by T
3, U
5(LM339), U
3(74LS123) and U
2(74LS02) constitute, it detects each zero crossing of industrial-frequency alternating current, forms and the corresponding negative pulse sequence of a plurality of zero crossings, as the zero cross fired signal, delivers to AT89C51 external interrupt INT
0End;
Single chip machine controlling circuit comprises U
4(89C51) operating key and display circuit three parts, operating key is by S
1, S
2, S
3And U
6(74LS215) constitute, display circuit is by U
8(7218B), U
1(74LS32) constitute with three LED.Power setting is with three key S
1, S
2, S
3Finish the adjustable continuously of 0～999W (or more high power) full power, S
1Be used for being provided with hundred, ten, individual position of power, the options button of ascending the throne, its function is to click to show hundred bit value and flicker, clicks to show ten digit value and flicker again, click again to show units value and flicker, and the like.S
2Be to increase key, the position that promptly clicks flicker adds 1, S
3Be to reduce key, the position that promptly clicks flicker subtracts 1, uses U simultaneously
8(7218B) drive three LED common cathode charactrons and show its instantaneous power.Three keys all have pull-up resistor R
10, R
11, R
12, be high-voltage state at ordinary times, when key is pressed, the INT of 89C51
1The end output low level.After configuring heating power, click the beginning key, AT89C51 postpones the corresponding time at P just according to the constant that sets in advance in the timer
3-4[14 pin, T
0] negative pulse of end output certain width;
The bidirectional triode thyristor circuits for triggering are by U
9(7406), N
2(9013), O
2(MOC3021), T
5, T
2, constitute, work as P
3-4(T
0) when holding output low level, drive circuit U
9(7406) output high level, switching tube N
2(9013) conducting, the input of photoelectrical coupler 02 (MOC3021) have the electric current input, and the bidirectional triode thyristor conducting of output triggers outside bidirectional triode thyristor T
5Conducting.When changing heating power, time delay, bidirectional triode thyristor T
5The angle of flow also change thereupon, output voltage is changed continuously.
3. according to the said numerally controlled microwave oven with continuously adjustable power of claim 1, be characterised in that altogether said newly-increased part panel [8] is by operating key S
1, S
2, S
3With three LED common cathode charactrons 1., 2., 3. constitute, be positioned at the control panel of microwave oven first half.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98123503 CN1260514C (en) | 1998-10-09 | 1998-10-09 | Numerally controlled microwave oven with continuously adjustable power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98123503 CN1260514C (en) | 1998-10-09 | 1998-10-09 | Numerally controlled microwave oven with continuously adjustable power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1250860A true CN1250860A (en) | 2000-04-19 |
| CN1260514C CN1260514C (en) | 2006-06-21 |
Family
ID=5228211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98123503 Expired - Fee Related CN1260514C (en) | 1998-10-09 | 1998-10-09 | Numerally controlled microwave oven with continuously adjustable power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1260514C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432873C (en) * | 2003-06-30 | 2008-11-12 | 乐金电子(天津)电器有限公司 | Micro-wave oven output energy control process |
| CN101081004B (en) * | 2007-06-22 | 2010-08-04 | 哈尔滨工业大学 | Power continuously adjustable circulating cooling type microwave irradiation breeding equipment |
| CN103687225A (en) * | 2013-12-04 | 2014-03-26 | 南昌大学 | Adjustable lighting control circuit with flicker eliminating function |
| CN104505842A (en) * | 2014-12-16 | 2015-04-08 | 榆林学院 | Zero-crossing triggering circuit based on bidirectional silicon-controlled switch |
| CN104764301A (en) * | 2015-04-23 | 2015-07-08 | 江南大学 | Microwave drying system capable of adjusting continuous linearity of output power |
| CN105517219A (en) * | 2015-12-29 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Control method and device of microwave oven circuit and microwave oven |
| CN105578637A (en) * | 2015-12-29 | 2016-05-11 | 广东美的厨房电器制造有限公司 | Control method and device for microwave oven circuit and microwave oven |
-
1998
- 1998-10-09 CN CN 98123503 patent/CN1260514C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432873C (en) * | 2003-06-30 | 2008-11-12 | 乐金电子(天津)电器有限公司 | Micro-wave oven output energy control process |
| CN101081004B (en) * | 2007-06-22 | 2010-08-04 | 哈尔滨工业大学 | Power continuously adjustable circulating cooling type microwave irradiation breeding equipment |
| CN103687225A (en) * | 2013-12-04 | 2014-03-26 | 南昌大学 | Adjustable lighting control circuit with flicker eliminating function |
| CN104505842A (en) * | 2014-12-16 | 2015-04-08 | 榆林学院 | Zero-crossing triggering circuit based on bidirectional silicon-controlled switch |
| CN104505842B (en) * | 2014-12-16 | 2016-06-22 | 榆林学院 | Zero-cross triggering circuit based on bidirectional triode thyristor |
| CN104764301A (en) * | 2015-04-23 | 2015-07-08 | 江南大学 | Microwave drying system capable of adjusting continuous linearity of output power |
| CN104764301B (en) * | 2015-04-23 | 2016-10-26 | 江南大学 | A kind of adjustable microwave drying system of output continuously linear |
| CN105517219A (en) * | 2015-12-29 | 2016-04-20 | 广东美的厨房电器制造有限公司 | Control method and device of microwave oven circuit and microwave oven |
| CN105578637A (en) * | 2015-12-29 | 2016-05-11 | 广东美的厨房电器制造有限公司 | Control method and device for microwave oven circuit and microwave oven |
| CN105578637B (en) * | 2015-12-29 | 2018-06-19 | 广东美的厨房电器制造有限公司 | Control method, control device and the micro-wave oven of microwave oven circuit |
| CN105517219B (en) * | 2015-12-29 | 2018-09-04 | 广东美的厨房电器制造有限公司 | Control method, control device and the micro-wave oven of microwave oven circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1260514C (en) | 2006-06-21 |
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