CN1232157C - Microwave oven control circuit - Google Patents
Microwave oven control circuit Download PDFInfo
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- CN1232157C CN1232157C CN 02121033 CN02121033A CN1232157C CN 1232157 C CN1232157 C CN 1232157C CN 02121033 CN02121033 CN 02121033 CN 02121033 A CN02121033 A CN 02121033A CN 1232157 C CN1232157 C CN 1232157C
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- Prior art keywords
- microwave oven
- magnetron
- switching device
- controlling circuit
- power supply
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Abstract
The present invention discloses a microwave oven control circuit which comprises a direct current power supply, a switching part, a control part, a magnetron and a transformation part, wherein the direct current power supply is used as an input power supply; the switching part is provided with at least three switching devices electrically connected which can switch the voltage of the direct current power supply; the control part can control all the switching devices; the magnetron can generate microwaves; the transformation part transforms the direct current voltage to voltage which can control the magnetron through the fact that the switching part is switched on/off. The microwave oven control circuit of the present invention can utilize automobile storage batteries widely used to provide energy for the magnetron which can generate microwaves. Thus, even under the condition of no power supply, for example, in the field or power failure, etc., food can also be conveniently cooked.
Description
Technical field
The present invention relates to a kind of controlling circuit of microwave oven, particularly relate to a kind of controlling circuit of microwave oven that adopts inverter.
Background technology
At present, most of household electrical appliance such as electric rice cooker, air-conditioning, refrigerator all adopt the reverser control mode, and it helps improving the performance of rate of energy and product, and easy to use.This reverser control mode is applicable to microwave oven too.Microwave oven is a kind of device that utilizes input current to produce the microwave that can heat heating target.
Fig. 1 is the circuit diagram of the controlling circuit of microwave oven of prior art.As shown in Figure 1, in this microwave oven, rectification circuit 15 can carry out rectification with the AC power 10 of input, electric current after rectification circuit 15 rectifications is applied on the primary winding of transformer 25 by reverser 20, and the secondary coil side of transformer 25 is equipped with the magnetron 40 that can produce microwave, and promptly magnetron 40 is to utilize the voltage of the secondary coil induction generation of transformer 25 to produce microwave.The primary winding voltage of transformer 25 is controlled by mains switch portion 30.Mains switch portion 30 controls the voltage that is applied to transformer 25 primary winding sides by the On/Off of pulse-width modulation control signal, and pulse-width modulation control signal be output signal with microcomputer 35 serves as the signal that the basis produces on reverser control part 55.The electric current of flowing through on the magnetron 40 can detect by current transformer 45, and output after rectification circuit 50 conversions.Current value signal through the current transformer 45 detected magnetrons 40 of flowing through can be transferred on the microcomputer 35.When magnetron 40 does not vibrate, there is not electric current on its positive pole, up to its inner heater heats and till launching hot electron, at this moment transformer 25 is in high pressure conditions.The heater of magnetron 40 inside normally sends hot electron and produces high frequency waves needs about 2 seconds special time.That is to say, by heater heats magnetron 40 is produced after the normal vibrations, it is anodal could to have electric current by stream.At this moment electric current is called forward current, and the product of forward current and forward voltage is the power P that is applied on the magnetron 40, can determine the size of the high frequency waves that produced according to the product of power P and magnetron 40 efficient.That is, the electric current on the magnetron 40 is directly proportional with the power output of high frequency waves, and electric current is big more, and then power output is just high more, and vice versa.That is to say, be transferred to microcomputer 35 by current transformer 45 detected current value signals after, just can utilize microcomputer 35 to control the electric current of flowing through on the magnetron 40, control the power output of the high frequency waves that produced with this.But the microwave stove of this prior art has following shortcoming, that is, because this microwave oven need adopt AC power commonly used, if the user is in the not field of AC power commonly used, then can't utilize microwave oven to cooking food, also have same problem when having a power failure in addition.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of controlling circuit of microwave oven that utilizes the automobile power source feeding mechanism that widely uses to come the controlled microwave stove.
In order to achieve the above object, controlling circuit of microwave oven provided by the invention comprises the DC power supply as the input power supply; At least have more than two and to be electrically connected and the switch portion of the switching device of changeable DC power supply voltage; All switching devices of may command, and can control size of current on the magnetron according to the current feedback signal of the detected magnetron of current transformer, control the control part of the high frequency waves power output that is produced with this; Can produce the magnetron of microwave; On/Off by switch portion converts direct voltage to the converter section that can control magnetron voltage; Can detect the current transformer of the magnetron current size of flowing through; With can convert the AC signal of current transformer output to direct current signal, and this signal is sent to the rectification circuit of microcomputer in the control part.
Controlling circuit of microwave oven of the present invention can utilize widely used automobile level to come to provide energy for the magnetron that can produce microwave, even do not have also can be easily to cooking food under the situation of power supply so in the open air or having a power failure etc.
Description of drawings
Below in conjunction with the drawings and specific embodiments controlling circuit of microwave oven of the present invention is elaborated.
Fig. 1 is the circuit diagram of the controlling circuit of microwave oven of prior art.
Fig. 2 to Fig. 4 is a controlling circuit of microwave oven embodiment circuit diagram of the present invention.
Embodiment
As shown in Figure 2, microwave oven of the present invention uses be provide from the outside can cooking food DC power supply DC, such as can adopt widely used automobile level.This controlling circuit of microwave oven also comprises switch portion 100, control part 110, magnetron 130 and converter section 120.Switch portion 100 has the switching device S1 and the S2 of two electrical connections, the voltage of the changeable DC power supply DC of these switching devices; Switching device S1 and S2 that control part 110 may command are all; Magnetron 130 can produce microwave; Converter section 120 then can convert direct voltage to the voltage that can control magnetron 130 by the On/Off of switch portion 100.Converter section 120 is to be made of transformer.Switching device S1 and S2 are made of bipolar transistor and diode parallel connection, and switching device S1 and S2 are in parallel then constitutes switch portion 100.Control part 110 is made of reverser control part and microcomputer, but does not express in this figure.Switching device S1 and S2 are the voltage that comes control transformation portion 120 primary winding sides by the On/Off of control signal, and this control signal then is that the output control signal with microcomputer serves as that the basis produces on the reverser control part.So the secondary coil of converter section 120 then recently produces the voltage that can start magnetron 130 so that it produces microwave according to the number of turn of coil.The electric current of flowing through on the magnetron 130 detects by current transformer 140, and this electric current is by rectification circuit 150 conversion back outputs.Can be transferred on the microcomputer in the control part 110 by the current value signal on the current transformer 140 detected magnetrons 130 of flowing through, therefore can utilize this microcomputer to control the electric current of flowing through on the magnetron 130, control the power output of the high frequency waves that produced with this.Even under the open-air situation of not using AC power always, also can use the automobile level to come the controlled microwave stove like this, bring convenience to cooking food.
Fig. 3 is another enforcement illustration of controlling circuit of microwave oven of the present invention.The structure identical with Fig. 2 adopts identical symbol.As shown in Figure 3, switch portion 100 is to be made of the resonance series type half-wave rectifying circuit that 2 switching device S1 and S2 form, and switching device S1, S2 are made of mos field effect transistor, diode and electric capacity parallel connection.The about 118A of electric current that flows through on this switching device S1, the S2 is so preferably adopt current handling capability and the fast mos field effect transistor of switch speed.By the switching device S1 that adopts mos field effect transistor, the switching of S2, can make the high voltage that produces on the secondary coil of converter section 120 up to 2KV, this voltage is applied on the magnetron 130 so that it produces microwave cooking food through half-wave voltage multiplying rectifier.
Fig. 4 is the another enforcement illustration of controlling circuit of microwave oven of the present invention.The structure identical with Fig. 2 still adopts identical symbol.As shown in Figure 4, switch portion 100 is to be made of the whole ripple rectification circuit of resonance series type that 4 switching device S1, S2, S3, S4 form, therefore the about 59A of electric current that flows through on each switching device S1, S2, S3, the S4 preferably adopts and the identical structure of embodiment among Fig. 3.Can produce the high voltage up to 2KV on the secondary coil of converter section 120, this voltage is applied on the magnetron 130 so that it produces microwave cooking food through half-wave voltage multiplying rectifier.
Claims (6)
1, a kind of controlling circuit of microwave oven is characterized in that: described controlling circuit of microwave oven comprises the DC power supply DC as the input power supply; At least have more than two and to be electrically connected and the switch portion (100) of the switching device S1～Sn of changeable DC power supply dc voltage; All switching devices of may command (S1～Sn), and can control size of current on the magnetron (130) according to the current feedback signal of the detected magnetron of current transformer (140) (130), control the control part (110) of the high frequency waves power output that is produced with this; Can produce the magnetron (130) of microwave; On/Off by switch portion (100) converts direct voltage to the converter section (120) that can control magnetron (130) voltage; Can detect the current transformer (140) of the magnetron of flowing through (130) size of current; With can convert the AC signal of current transformer (140) output to direct current signal, and this signal is sent to the rectification circuit (150) of the interior microcomputer of control part (110).
2, controlling circuit of microwave oven according to claim 1 is characterized in that: described switching device S1, S2 are made of bipolar transistor and diode parallel connection.
3, controlling circuit of microwave oven according to claim 2 is characterized in that: described switching device S1, S2 are in parallel.
4, controlling circuit of microwave oven according to claim 1 is characterized in that: described switching device S1, S2 are made of mos field effect transistor, diode and electric capacity parallel connection.
5, controlling circuit of microwave oven according to claim 4 is characterized in that: described switch portion (100) is to be made of the resonance series type half-wave rectifying circuit that switching device S1, S2 form.
6, controlling circuit of microwave oven according to claim 4 is characterized in that: described switch portion (100) is to be made of the whole ripple rectification circuit of resonance series type that switching device S1, S2, S3, S4 form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121033 CN1232157C (en) | 2002-05-31 | 2002-05-31 | Microwave oven control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02121033 CN1232157C (en) | 2002-05-31 | 2002-05-31 | Microwave oven control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1462158A CN1462158A (en) | 2003-12-17 |
| CN1232157C true CN1232157C (en) | 2005-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02121033 Expired - Fee Related CN1232157C (en) | 2002-05-31 | 2002-05-31 | Microwave oven control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1232157C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6290089B2 (en) * | 2012-09-25 | 2018-03-07 | 昭和電工株式会社 | Microwave heating device |
| CN111615230B (en) * | 2020-05-13 | 2022-06-10 | 广东美的厨房电器制造有限公司 | Control method and device for microwave household appliance, microwave household appliance and electronic equipment |
| CN114401564B (en) * | 2022-01-12 | 2024-05-24 | 广东美的厨房电器制造有限公司 | Microwave oven and vehicle |
-
2002
- 2002-05-31 CN CN 02121033 patent/CN1232157C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1462158A (en) | 2003-12-17 |
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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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051214 |