CN103428931B - The control circuit of microwave oven - Google Patents
The control circuit of microwave oven Download PDFInfo
- Publication number
- CN103428931B CN103428931B CN201210158467.XA CN201210158467A CN103428931B CN 103428931 B CN103428931 B CN 103428931B CN 201210158467 A CN201210158467 A CN 201210158467A CN 103428931 B CN103428931 B CN 103428931B
- Authority
- CN
- China
- Prior art keywords
- control portion
- magnetron
- microwave oven
- pulse width
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Y02B40/143—
Abstract
The present invention relates to the control circuit of a kind of microwave oven, the rotating speed of fan is associated to improve the usefulness of microwave oven by it with magnetron output.The control circuit of this microwave oven includes control portion, converter, magnetron and cooling fan.Control portion is for output one pulse width modulating signal.Converter connects this control portion to receive this pulse width modulating signal.Magnetron connects this converter.Cooling fan connects this control portion to receive this pulse width modulating signal.
Description
Technical field
The present invention relates to microwave oven, especially relate to the control circuit of microwave oven.
Background technology
Conventional microwave oven is mainly made up of magnetron, converter, cooling fan and control portion.Magnetron major function is
Send high-frequency microwave for adding hot food.The function of converter is to accept pulse width modulation (PWM) signal that control portion sends
The output of magnetron is adjusted.The function of cooling fan is to cool down converter and magnetron.Control portion
Function be accept user instruction and to control microwave oven cooking function, including converter, cooling fan control.
Microwave current stove regulation output mode be utilize control portion output pwm signal to drive converter, then
Being realized the control to magnetron output by converter, above-mentioned pwm signal can change dutycycle (DUTY).Such as Fig. 1
Shown in, dutycycle (DUTY)=t/T*100%.
Control portion is through changing dutycycle and fundamentally realizes the control to magnetron output, and dutycycle increases
Greatly, magnetron output also increases.The relation curve of magnetron output and dutycycle is as shown in Figure 2.
And current air cooling way comprises two kinds, one is to use ac fan, and control portion passes through solid-state relay to wind
Fan carries out speed governing；Another kind is to use DC fan, and control portion sends the pwm signal of different duty (DUTY) and carries out fan
Speed governing, dutycycle (DUTY) increases, and fan speed also increases.The relation curve of fan speed and dutycycle is as shown in Figure 3.
Using in the air cooling way of ac fan, control portion controls the frequency of solid-state relay must be with supply frequency one
Sample and it needs to control portion uses single port to control.Use in the air cooling way of DC fan, the control to fan of the control portion
System is also to use single port to control.Fig. 4 illustrates rotation speed of the fan and the control of magnetron output in existing microwave oven
Circuit processed.With reference to shown in Fig. 4, control portion 14 has two PWM port, exports separate pwm signal respectively to fan 13
With converter 12.Converter 12 is for controlling the output of magnetron 11.
Summary of the invention
During due to magnetron high-power output, the temperature of himself and converter is higher, during low-power output, himself
Relatively low with converter temperature, now can use different air-cooled speed.Therefore make the rotating speed of fan according to magnetron output
Regulate the usefulness being beneficial to improve microwave oven in real time.
Therefore, the present invention provides the control circuit of a kind of microwave oven, and the rotating speed of fan is closed by it with magnetron output
Join to improve the usefulness of microwave oven.
The present invention solves above-mentioned technical problem and employed technical scheme comprise that the control circuit that proposes a kind of microwave oven, bag
Include control portion, converter, magnetron and cooling fan.Control portion is for output one pulse width modulating signal.Converter is even
Meet this control portion to receive this pulse width modulating signal.Magnetron connects this converter.Cooling fan connect this control portion with
Receive this pulse width modulating signal.
In one embodiment of this invention, this control portion has a pulse width modulation port to export this pulse width tune
Signal processed, this converter and this cooling fan are all connected with this pulse width modulation port.
In one embodiment of this invention, above-mentioned control circuit also includes a signaling conversion circuit, is connected to this control portion
And between this cooling fan, for this pulse width modulating signal is converted into the signal being suitable for driving this cooling fan.
In one embodiment of this invention, the output of this magnetron closes with the dutycycle of this pulse width modulating signal
Connection.
In one embodiment of this invention, the rotating speed of this cooling fan closes with the dutycycle of this pulse width modulating signal
Connection.
Due to the fact that the above technical scheme of employing, be allowed to compared with prior art, there is following remarkable advantage:
1, the rotating speed of prior art wind fan does not associate with magnetron output, cools down fan in the embodiment of the present invention
Use same control signal with converter, while regulation magnetron output, have adjusted the speed of cooling fan the most in real time
Degree, improves the efficiency of microwave oven, also saves resource；
2, in prior art, control portion needs to be equipped with control port and the Frequency Converter Control port of cooling fan, and the present invention is real
Execute and example cools down fan and the converter same port of employing, save the port in a control portion, can suitably reduce cost.
Accompanying drawing explanation
For the above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with the accompanying drawing tool to the present invention
Body embodiment elaborates, wherein:
Fig. 1 illustrates the pwm signal controlling magnetron output in microwave oven.
Fig. 2 illustrates magnetron output and the relation curve of pwm signal dutycycle.
Fig. 3 illustrates fan speed and the relation curve of pwm signal dutycycle.
Fig. 4 illustrates rotation speed of the fan and the control circuit of magnetron output in existing microwave oven.
Fig. 5 illustrates rotation speed of the fan and the control circuit of magnetron output in the microwave oven of one embodiment of the invention.
Fig. 6 illustrates rotation speed of the fan and the control circuit of magnetron output in the microwave oven of another embodiment of the present invention.
Detailed description of the invention
Fig. 5 illustrates rotation speed of the fan and the control circuit of magnetron output in the microwave oven of one embodiment of the invention.Ginseng
According to shown in Fig. 5, control circuit comprises magnetron 21, converter 22, cooling fan 23 and control portion 24.Control portion 24 is used for
Export a pulse width modulation (PWM) signal.Converter 22 connects this control portion to receive this pwm signal.And magnetron 21 is even
Connect this converter 22.Thus, magnetron 21 is controlled by pwm signal.Cooling fan 23 for by air cooling way to converter and
Magnetron cools down.
In the present embodiment, cooling fan 23 connects control portion 24 to receive this pwm signal.Thus, turning of fan is cooled down
The pwm signal controlling employing identical that speed controls with regulation magnetron output is controlled, and its dutycycle is identical.This side
The benefit of formula is, is associated with the output of magnetron 21 by the rotating speed of cooling fan 23.When the output height of magnetron,
Need more preferable cooling effect, and the rotating speed now cooling down fan 23 is the highest；When the output of magnetron is low, need
Cooling effect reduce, and the rotating speed now cooling down fan 23 is just the lowest.Therefore, the rotating speed of cooling fan will be according to magnetron
Output regulates in real time, this usefulness being beneficial to improve microwave oven.
In the present embodiment, control portion 24 can be made to have single PWM port, to export this pwm signal.Converter 22 He
Cooling fan 23 is all connected with this PWM port, which saves the port in a control portion, can suitably reduce cost.
Fig. 6 illustrates rotation speed of the fan and the control circuit of magnetron output in the microwave oven of another embodiment of the present invention.
With reference to shown in Fig. 6, control circuit comprises magnetron 21, converter 22, cooling fan 23, control portion 24 and signaling conversion circuit
25, wherein control portion 24 and signaling conversion circuit 25 constitute the control circuit of cooling fan 23.Control portion 24 is for output one arteries and veins
Rush width modulated (PWM) signal.Converter 22 connects this control portion to receive this pwm signal.And magnetron 21 connects this frequency conversion
Device 22.Thus, magnetron 21 is controlled by pwm signal.
In the present embodiment, a signaling conversion circuit 25 is connected between control portion 24 and cooling fan 23, and being used for should
Pwm signal is converted into the signal being suitable for driving this cooling fan 23.
The controlling circuit of microwave oven of the embodiment of the present invention compared with prior art, has the advantages that
1, the rotating speed of prior art wind fan does not associate with magnetron output, cools down fan in the embodiment of the present invention
Use same control signal with converter, while regulation magnetron output, have adjusted the speed of cooling fan the most in real time
Degree, improves the efficiency of microwave oven, also saves resource；
2, in prior art, control portion needs to be equipped with control port and the Frequency Converter Control port of cooling fan, and the present invention is real
Execute and example cools down fan and the converter same port of employing, save the port in a control portion, can suitably reduce cost.
Although the present invention discloses as above with preferred embodiment, so it is not limited to the present invention, any this area skill
Art personnel, without departing from the spirit and scope of the present invention, when making a little amendment and perfect, the therefore protection model of the present invention
Enclose when with being as the criterion that claims are defined.
Claims (4)
1. a control circuit for microwave oven, including:
Control portion, for output one pulse width modulating signal；
Converter, connects this control portion to receive this pulse width modulating signal；
Magnetron, connects this converter；And
Cooling fan, connects this control portion to receive this pulse width modulating signal；
Wherein, this control portion has a pulse width modulation port to export this pulse width modulating signal, this converter and should
Cooling fan is all connected with this pulse width modulation port.
2. the control circuit of microwave oven as claimed in claim 1, it is characterised in that also include a signaling conversion circuit, be connected to
Between this control portion and this cooling fan, it is suitable for driving this cooling fan for being converted into by this pulse width modulating signal
Signal.
3. the control circuit of microwave oven as claimed in claim 1, it is characterised in that the output of this magnetron and this pulse width
The dutycycle association of degree modulated signal.
4. the control circuit of microwave oven as claimed in claim 1, it is characterised in that the rotating speed of this cooling fan and this pulse width
The dutycycle association of modulated signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210158467.XA CN103428931B (en) | 2012-05-18 | 2012-05-18 | The control circuit of microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210158467.XA CN103428931B (en) | 2012-05-18 | 2012-05-18 | The control circuit of microwave oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103428931A CN103428931A (en) | 2013-12-04 |
| CN103428931B true CN103428931B (en) | 2016-12-21 |
Family
ID=49652888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210158467.XA Expired - Fee Related CN103428931B (en) | 2012-05-18 | 2012-05-18 | The control circuit of microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103428931B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4098958A4 (en) * | 2020-02-18 | 2023-10-18 | Qingdao Haier Refrigerator Co., Ltd. | Control method for heating unit, heating unit, and refrigerating and freezing apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566697B (en) * | 2018-04-11 | 2021-03-19 | 广东美的厨房电器制造有限公司 | Control method and microwave cooking appliance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518398A (en) * | 2003-01-27 | 2004-08-04 | Lg������ʽ���� | Variable frequency type frequency conversion microwave oven and its control method |
| CN2822093Y (en) * | 2005-03-16 | 2006-09-27 | 深圳市拓邦电子科技股份有限公司 | Frequency converter for microwave heating |
| CN2935699Y (en) * | 2006-08-08 | 2007-08-15 | 惕姆·弗兰克 | Portable AC-DC dual-purpose frequency changing microwave oven |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940004978B1 (en) * | 1991-11-26 | 1994-06-09 | 주식회사 금성사 | Heat control system for a microwave range |
-
2012
- 2012-05-18 CN CN201210158467.XA patent/CN103428931B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518398A (en) * | 2003-01-27 | 2004-08-04 | Lg������ʽ���� | Variable frequency type frequency conversion microwave oven and its control method |
| CN2822093Y (en) * | 2005-03-16 | 2006-09-27 | 深圳市拓邦电子科技股份有限公司 | Frequency converter for microwave heating |
| CN2935699Y (en) * | 2006-08-08 | 2007-08-15 | 惕姆·弗兰克 | Portable AC-DC dual-purpose frequency changing microwave oven |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4098958A4 (en) * | 2020-02-18 | 2023-10-18 | Qingdao Haier Refrigerator Co., Ltd. | Control method for heating unit, heating unit, and refrigerating and freezing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103428931A (en) | 2013-12-04 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161221 Termination date: 20190518 |