CN203298358U - Microwave oven - Google Patents

Microwave oven Download PDF

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Publication number
CN203298358U
CN203298358U CN2013202973158U CN201320297315U CN203298358U CN 203298358 U CN203298358 U CN 203298358U CN 2013202973158 U CN2013202973158 U CN 2013202973158U CN 201320297315 U CN201320297315 U CN 201320297315U CN 203298358 U CN203298358 U CN 203298358U
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CN
China
Prior art keywords
relay
input
micro
wave oven
transformer
Prior art date
Application number
CN2013202973158U
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Chinese (zh)
Inventor
谭颖峰
Original Assignee
广东美的厨房电器制造有限公司
美的集团股份有限公司
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Priority to CN2013202973158U priority Critical patent/CN203298358U/en
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Publication of CN203298358U publication Critical patent/CN203298358U/en

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Abstract

The utility model provides a microwave oven, which comprises N relays, a transformer and a controller, wherein one end of each of the N relays is connected with input alternating current; N is an integer greater than 1; a primary winding of the transformer has N+1 input ends at least; a first input end in the N+1 input ends is connected with the input alternating current, and the N input ends in the N+1 input ends are connected with the other ends of the corresponding relays; the controller is used for controlling the N relays, is connected with a control end of each relay, and controls one of the N relays to close so as to adjust output power of the microwave oven. The microwave oven can output proper power to avoid local overheating to a heated object; the on-off manner is not adopted or rarely adopted for the relays, so that the power loss at the initial start of magnetrons can be reduced and the efficiency is improved; in addition, the frequency of on-off operation to the relays is reduced, so that the service life of the relays is prolonged and the probability of contact adhesion of the relays is lowered.

Description

Micro-wave oven

Technical field

The utility model relates to household electrical appliance technical field, particularly a kind of micro-wave oven.

Background technology

Micro-wave oven is a kind of relatively more universal household electrical appliance, microwave-oven-heating concentration of energy, rapid, but easily produce food hot-spot phenomenon, reduce the nutritive value of food.For head it off, the micro-wave oven product all is designed with and falls the power heating function.as shown in Figure 1, a kind of structure diagram that drives the micro-wave oven of magnetron with high-tension transformer for prior art, the input of controlling circuit of microwave oven 101 is inputted for example live wire L with alternating current and is connected with zero line N, output terminals A, the voltage of B end is positioned on electric-controlled plate 106 through relay 102(relay 102) be connected to the C of high-tension transformer 103, the D end, supply with high-tension transformer 103 and high-voltage rectifier 105 with fixed voltage, magnetron 104 work, generally by the make-and-break time that changes relay 102, change the power output of micro-wave oven, reach cooking food effect preferably.But the mode by relay 102 break-makes realizes falling power and has following shortcoming: 1, under relay 102 break-make modes, magnetron 104 is with for example total power output of firm power within the working time, microwave oven energy is concentrated, heating is fast, food hot-spot phenomenon easily occurs, reduce food value.2, magnetron 104 reaches stable output at every turn needs the regular hour, is generally 1~2 second, and in this time, the power output of magnetron 104 is low, and power attenuation is large.As shown in Figure 2, take power 1000W(watt) be reference, wherein, the longitudinal axis is that power represents with w, and transverse axis is to represent with t the time, and solid line represents power, dotted line represents efficiency, under relay 102 break-make modes, for example the efficiency in 1~2 second is very low for the each certain hour before reaching stable output of magnetron 104, and power attenuation is large.3, relay 102 interruption work, easily cause contact adhesion fault, even causes fire.

The utility model content

The purpose of this utility model is intended to solve at least to a certain extent one of above-mentioned technical problem.

For this reason, the purpose of this utility model is to propose a kind of micro-wave oven, and this micro-wave oven can be exported suitable power, avoid the heating object hot-spot, and relay can use no or little the mode of break-make, thereby the power attenuation the when startup of minimizing magnetron is initial has improved efficiency.In addition, the minimizing of relay on-off operating frequency, can extend its life-span, reduces the possibility of relay contact adhesion.

For achieving the above object, the utility model proposes a kind of micro-wave oven, this micro-wave oven comprises: N relay, an end of each relay in a described N relay all are connected with the alternating current of input, and wherein, N is the integer greater than 1; Transformer, the armature winding of described transformer have N+1 input, and the first input end in a described N+1 input is connected with the alternating current of described input, and N input in a described N+1 input is connected with the other end of corresponding relay; To the controller that a described N relay is controlled, described controller is connected with the control end of described each relay, and a relay closes in the described N of a described controller control relay is to regulate the power output of described micro-wave oven.

According to micro-wave oven of the present utility model, control any closure in N relay by controller, the different input conducting of transformer, and then transformer is with different intrinsic standoff ratio input voltages, thereby regulate the power output of micro-wave oven, when micro-wave oven is worked, can change the intrinsic standoff ratio of transformer by the corresponding relay of controller switching, and then export suitable power, can avoid heating object hot-spot phenomenon.In addition, N relay can use no or little the break-make mode, reduced power attenuation, raises the efficiency.The minimizing of relay on-off operating frequency can extend the life-span of relay, reduces relay contact adhesion possibility.In addition, microwave oven is simple, and cost is low, and reliability is high.

Wherein, when any one in a described N relay was closed, N-1 relay in a described N relay all disconnected.

In addition, above-mentioned microwave rate also comprises: electric-controlled plate, and a described N relay and described controller are arranged on described electric-controlled plate, and described electric-controlled plate is connected with the alternating current of described input.

Further, described transformer also comprises the first secondary windings and second subprime winding, and described the first secondary windings is connected with the high-voltage rectifier of described micro-wave oven, and described second subprime winding is connected with the magnetron of described micro-wave oven.

Closer, described high-voltage rectifier comprises: after being connected, high-voltage capacitor and resistance in parallel, an end of described high-voltage capacitor and an end of described resistance is connected with an end of described the first secondary coil, and the other end ground connection of described the first secondary coil; High-voltage diode, the minus earth of described high-voltage diode, the anode of described high-voltage diode is connected with the other end of the other end of described high-voltage capacitor and described resistance.

In addition, the first end of described magnetron is connected with an end of described second subprime winding, after being connected with the other end of described second subprime winding, the second end of described magnetron is connected with the anode of described high-voltage diode, and the 3rd end ground connection of described magnetron.

Preferably, above-mentioned micro-wave oven also comprises: fuse, described fuse is connected to the positive input terminal of the alternating current of described input.

The aspect that the utility model is additional and advantage part in the following description provide, and part will become obviously from the following description, or by practice of the present utility model, recognize.

Description of drawings

Above-mentioned and/or the additional aspect of the utility model and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:

Fig. 1 is the electrical block diagram of the micro-wave oven of prior art;

Fig. 2 is the curve map of power of the micro-wave oven of prior art;

Fig. 3 is the electrical block diagram according to the micro-wave oven of the utility model embodiment;

Fig. 4 is the electrical block diagram according to the micro-wave oven of an embodiment of the utility model;

Fig. 5 is the electrical block diagram according to the micro-wave oven of another embodiment of the present utility model; And

Fig. 6 is the curve synoptic diagram according to the power of the micro-wave oven of an embodiment of the present utility model.

Reference numeral

N relay 301, transformer 302 and controller 303, electric-controlled plate 304, the first secondary windings 305, second subprime winding 306, high-voltage rectifier 307, magnetron 308, high-voltage capacitor 309, resistance 310, high-voltage diode 311, fuse 401 and control circuit 402.

The specific embodiment

Below describe embodiment of the present utility model in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the utility model, and can not be interpreted as restriction of the present utility model.

Disclosing hereinafter provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter parts and the setting of specific examples are described.Certainly, they are only example, and purpose does not lie in restriction the utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and purpose clearly, itself do not indicate the relation between the various embodiment of discuss and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skills can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, First Characteristic described below Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are the direct embodiment of contact, also can comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may not be direct contacts.

In description of the present utility model, need to prove, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, can be also the connection of two element internals, can be directly to be connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.

Micro-wave oven according to the utility model embodiment is described with reference to the accompanying drawings.

As shown in Figure 3, the micro-wave oven of the utility model embodiment comprises: N relay 301, transformer 302 and controller 303.Wherein, an end of each relay in N relay 301 all is connected with the alternating current of input such as the zero line N in Fig. 3, and wherein, N is the integer greater than 1.The armature winding of transformer 302 has N+1 input at least, wherein, more than the input of N+1, can be used as standby end.First input end C1 in N+1 input and the alternating current of input for example in Fig. 3 live wire L be connected, N input in N+1 input is connected with the other end of corresponding relay, namely say, first input end C1 in N+1 input, other a N input is corresponding one by one with N relay 301, and N input is corresponding connected with the other end of N relay 301 respectively.303 pairs of N relays 301 of controller are controlled, and controller 303 is connected with the control end of each relay, and a relay closes in N relay 301 of controller 303 controls is to regulate the power output of micro-wave oven.In embodiment of the present utility model, when any one in N relay 301 was closed, N-1 relay in N relay 301 all disconnected.Namely say, controller 303 can only be controlled a closure in N relay 301 at every turn, the different relay closes that controller 303 is controlled in N relay 301, the number of turn of the primary coil of transformer 302 connections is different, so transformer 302 is with different intrinsic standoff ratio input voltages, namely the input voltage of transformer 302 is different, and then the output voltage of transformer 302 is different, thereby make the power output of micro-wave oven different, the purpose that realizes regulating microwave power.

In an embodiment of the present utility model, as shown in Figure 3, above-mentioned micro-wave oven also comprises electric-controlled plate 304, and N relay 301 and controller 303 are arranged on electric-controlled plate 304, and electric-controlled plate 304 is connected with the alternating current of input.

Further, in an embodiment of the present utility model, as shown in Figure 3, transformer 302 also comprises the first secondary windings 305 and second subprime winding 306, the first secondary windings 305 is connected with the high-voltage rectifier 307 of micro-wave oven, and second subprime winding 306 is connected with the magnetron 308 of micro-wave oven.Wherein, high-voltage rectifier 307 comprises: high-voltage capacitor 309 in parallel and resistance 310, high-voltage diode 311.After being connected with an end of resistance 310, one end of high-voltage capacitor 309 is connected with an end of the first secondary coil 305, the other end ground connection of the first secondary coil 305, the minus earth of high-voltage diode 311, the anode of high-voltage diode 311 is connected with the other end of resistance 310 with the other end of high-voltage capacitor 309.In addition, the first end 1 of the magnetron 308 of micro-wave oven is connected with an end of second subprime winding 306, after being connected with the other end of second subprime winding 306, the second end 2 of magnetron 308 is connected with the anode of high-voltage diode 311, and the 3rd end 3 ground connection of magnetron 308.

In addition, in an embodiment of the present utility model, as shown in Figure 4, above-mentioned micro-wave oven also comprises fuse 401 and control circuit 402.Wherein, fuse 401 is connected to the positive input terminal live wire L for example of the alternating current of input, can play a protective role.Control circuit 402 is used for controlling work such as the rotating disk, blower fan, timer of other function element of micro-wave oven etc., guarantees the more good berth of micro-wave oven, is prior art, here repeats no more.The input of control circuit 402 and the input of alternating current for example live wire L are connected with zero line N, the first output terminals A 1 of control circuit 402 is connected with the first input end C1 of transformer 302 primary coils, and the second output B1 of control circuit 402 is connected with an end of N relay 301.the power adjustment procedure of the micro-wave oven of the utility model embodiment below is described as an example of N=2 example, as shown in Figure 4, it is input C1 that the primary coil of transformer 302 has 3 inputs, input D1 and input E1, wherein, input C1 is connected with the first output terminals A 1 of control circuit 402, input D1 and input E1 respectively with relay for example relay R 1 be connected with the other end of relay R 2, the end that relay R 1 is connected with relay R is connected with the second output B1 of control circuit 402 after being connected, the input D1 that sets transformer 302 primary coils is located at the centre position of primary coil.Controller 303 is by controlling for example any closure in relay R 1 and relay R 2 of two relays, the number of turn of the coil of the primary coil of transformer 302 connection is different, be that transformer 302 is with different intrinsic standoff ratio input voltages, the microwave energy of magnetron 304 generations is different, thereby makes the different power of micro-wave oven output.Particularly, for example, controller 303 control relay R2 are closed, the second output B1 of control circuit 402 is communicated with the input E1 of transformer 302 primary coils, the whole conductings of coil of transformer 302 primary coils, the microwave energy of the generation of magnetron 304 is maximum at this moment, can think the output of micro-wave oven total power.If controller 303 control relay R1 are closed, the second output B1 of control circuit 402 is communicated with the input D1 of transformer 302 primary coils, this moment transformer 302 half coil conducting, the power output of micro-wave oven reduces, can think half-power output, can control different relay closes by controller 303 as required, select suitable power output.

In like manner, in another embodiment of the present utility model, as shown in Figure 5, the electrical schematic diagram of micro-wave oven during for N=3.As shown in Figure 5, three relays for example relay R 1, relay R 2 and relay R 3 are set, the primary coil of transformer 302 has 4 inputs, for example input C2, input D2, input E2 and input F2, wherein, input C2 is connected with the first output terminals A 2 of control circuit 402, is connected with the second output B2 of control circuit 402 after input D2 is connected with input E2, and input F2 is connected with the output N of control circuit 402.controller 303 control different relay closes transformer 302 according to different intrinsic standoff ratio input voltages, and then the output voltage of transformer 302 is different, thereby the power that micro-wave oven output is different, can think the power output of micro-wave oven is divided into three gears, for example, when controller 303 control relay R12 are closed, the input E2 of transformer 302 is communicated with the second output B2 of control circuit 402, the C2 of primary coil holds to the coil of E2 end and all switches on, the microwave energy of magnetron 304 generations is maximum, can think that micro-wave oven exports with total power, can be called gear 1.If controller 303 control relay R22 closures the input D2 of primary coil are communicated with the second output B2 of control circuit 402, the input C2 of primary coil and the coil between input D2 are all switched at this moment, the microwave energy of magnetron 304 generations reduces, the power output of micro-wave oven also descends accordingly, can be called gear 2.If controller 303 control relay R32 closures the input F2 of primary coil are communicated with the output N of control circuit 402, the input C2 of primary coil and the coil between input F2 are all switched at this moment, the microwave energy of magnetron 304 generations further reduces, the power output of micro-wave oven correspondingly further reduces, and can be called gear 3.So can control as required relay closes corresponding to different gears, thereby transformer 302 is with different intrinsic standoff ratio input voltages, can regulate the power output of micro-wave oven, and not need the control relay break-make power output of regulating micro-wave oven constantly, can raise the efficiency.As shown in Figure 6, take 500W(watt) be reference power, wherein, the longitudinal axis is that power represents with w, and transverse axis is to represent with t the time, and solid line represents power, and dotted line represents efficiency, can find out, has reduced and has started power attenuation when initial, has improved efficiency.

below describe take two relays and three relays as embodiment respectively, in like manner, as required, N relay 301 can also be set, correspondingly, N relay 301 is connected to the different inputs of transformer 302 primary coils, controller 303 is controlled any closure in N relay 301, transformer 302 is with different intrinsic standoff ratio input voltages, and then transformer 302 output voltages are different, thereby can regulate the power output of micro-wave oven, and after selected suitable power output, corresponding relay can be connected continuously, avoid the work of relay interruption to cause power attenuation.

In sum, micro-wave oven according to the utility model embodiment, control any closure in N relay by controller, the different input conducting of transformer, and then transformer is with different intrinsic standoff ratio input voltages, thus regulate the power output of micro-wave oven, when micro-wave oven is worked, can change the intrinsic standoff ratio of transformer by the corresponding relay of controller switching, and then make the suitable power of micro-wave oven output, can avoid heating object hot-spot phenomenon.In addition, N relay can use no or little the break-make mode, can reduce power attenuation, raises the efficiency.The minimizing of relay on-off operating frequency can extend the life-span of relay, reduces relay contact adhesion possibility.In addition, microwave oven is simple, and cost is low, and reliability is high.

Each functional unit in each embodiment of the utility model can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt software function module, or the form that software and hardware coordinates realizes.If described integrated module uses that the form of software function module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium.

The above-mentioned storage medium of mentioning can be read-only storage, disk or CD etc.

In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.

Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that in the situation that do not break away from principle of the present utility model and spirit can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is by claims and be equal to and limit.

Claims (7)

1. a micro-wave oven, is characterized in that, comprising:
N relay, an end of each relay in a described N relay all are connected with the alternating current of input, and wherein, N is the integer greater than 1;
Transformer, the armature winding of described transformer have N+1 input at least, and the first input end in a described N+1 input is connected with the alternating current of described input, and N input in a described N+1 input is connected with the other end of corresponding relay;
To the controller that a described N relay is controlled, described controller is connected with the control end of described each relay, and a relay closes in the described N of a described controller control relay is to regulate the power output of described micro-wave oven.
2. micro-wave oven as claimed in claim 1, is characterized in that, when any one in a described N relay was closed, N-1 relay in a described N relay all disconnected.
3. micro-wave oven as claimed in claim 1, is characterized in that, also comprises:
Electric-controlled plate, a described N relay and described controller are arranged on described electric-controlled plate, and described electric-controlled plate is connected with the alternating current of described input.
4. micro-wave oven as claimed in claim 1, it is characterized in that, described transformer also comprises the first secondary windings and second subprime winding, and described the first secondary windings is connected with the high-voltage rectifier of described micro-wave oven, and described second subprime winding is connected with the magnetron of described micro-wave oven.
5. micro-wave oven as claimed in claim 4, is characterized in that, described high-voltage rectifier comprises:
After being connected, high-voltage capacitor and resistance in parallel, an end of described high-voltage capacitor and an end of described resistance is connected with an end of described the first secondary coil, the other end ground connection of described the first secondary coil;
High-voltage diode, the minus earth of described high-voltage diode, the anode of described high-voltage diode is connected with the other end of the other end of described high-voltage capacitor and described resistance.
6. micro-wave oven as claimed in claim 5, it is characterized in that, the first end of described magnetron is connected with an end of described second subprime winding, after being connected with the other end of described second subprime winding, the second end of described magnetron is connected with the anode of described high-voltage diode, the 3rd end ground connection of described magnetron.
7., as the described micro-wave oven of claim 1-6 any one, it is characterized in that, also comprise:
Fuse, described fuse is connected to the positive input terminal of the alternating current of described input.
CN2013202973158U 2013-05-27 2013-05-27 Microwave oven CN203298358U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104034738A (en) * 2014-06-24 2014-09-10 黑龙江工程学院 Laboratory microwave deicing instrument
CN105444221A (en) * 2015-12-09 2016-03-30 九阳股份有限公司 Induction cooker and power control method and device thereof
CN106123054A (en) * 2016-07-02 2016-11-16 谭颖峰 A kind of electrical heating stove
CN107844061A (en) * 2016-09-20 2018-03-27 广东美的生活电器制造有限公司 Electric heater and its heating control circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104034738A (en) * 2014-06-24 2014-09-10 黑龙江工程学院 Laboratory microwave deicing instrument
CN105444221A (en) * 2015-12-09 2016-03-30 九阳股份有限公司 Induction cooker and power control method and device thereof
CN106123054A (en) * 2016-07-02 2016-11-16 谭颖峰 A kind of electrical heating stove
CN107844061A (en) * 2016-09-20 2018-03-27 广东美的生活电器制造有限公司 Electric heater and its heating control circuit

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