CN101995043B - Microwave oven control circuit and control method thereof - Google Patents
Microwave oven control circuit and control method thereof Download PDFInfo
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- CN101995043B CN101995043B CN200910194402.9A CN200910194402A CN101995043B CN 101995043 B CN101995043 B CN 101995043B CN 200910194402 A CN200910194402 A CN 200910194402A CN 101995043 B CN101995043 B CN 101995043B
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Abstract
The invention relates to a microwave oven control circuit and a control method thereof, which are mainly used for controlling the state of an oven lamp in a microwave oven. The microwave oven control circuit comprises a main loop switching switch, a short circuit loop switching switch, a main loop relay and a signal switch which are connected through circuits, wherein the main loop switching switch and a short circuit loop switching switch can adopt double-throw micro switches, and are respectively provided with a static contact, a normally closed contact and a normally open contact, when the main loop switching switch is switched to the static contact to be in a state connected with the normally open contact, the short circuit loop switching switch is switched to the static contact to be in a state connected with the normally open contact, and a loop from both ends of a power supply to both ends of the oven lamp is formed so that the oven lamp can be turned on, so the mode of singly controlling the oven lamp by a relay in the prior art can be replaced. Thereby, the invention can save the product cost.
Description
Technical field
The present invention relates to the control flow of microwave oven lamp, especially relate to a kind of controlling circuit of microwave oven reducing costs and control method thereof.
Background technology
The micro-wave oven of frequency converter machine has particular requirement on controlling at present: when door is opened, stove lamp is bright; Door is closed behind the door, and stove lamp is dark; When micro-wave oven work, stove lamp is bright.After this function can easily be seen clearly and opens the door, the situation in the furnace chamber of micro-wave oven after food heating.Conventionally realizing this function controls by control stove lamp relay and program on control circuit board.
Fig. 1 illustrates the circuit diagram of existing micro-wave oven.Shown in Fig. 1, in circuit, left side is alternating current 220V power supply, after noise filter FIL, controlled by control circuit, control circuit comprises major loop K switch 1, short switch K2, signaling switch K3 and major loop relay (RY1) and stove lamp relay (RY2).Wherein, existing major loop switch is to use open type microswitch, and short switch is to use closed type microswitch, and signaling switch is to adopt open type microswitch.Major loop switch can be controlled fan electromotor M
f, rotary tray motor M
Π, the device such as barbecue heating tube R, right side is the magnetron G of micro-wave oven, the device work of frequency converter INV, determines whether to be incorporated to operating circuit of microwave oven by short switch K2.
According to the operation principle of existing micro-wave oven, major loop switch, short switch, signal and each relay switch successively sequence of movement are:
1., after fire door is opened, stove lamp is bright.While opening the door, major loop switch switches (major loop switch disconnects not conducting) → signaling switch downwards and upwards switches (signaling switch disconnection) → short switch closure (short switch closed conducting) → major loop relay and receive after signaling switch cut-off signal, upwards switch (disconnection) → stove lamp relay at once and receive after signaling switch cut-off signal, switch downwards (closed conducting) at once.As shown in Figure 2 A, stove lamp has electric current to pass through to loop state, and stove lamp is lit.
2., after fire door is closed, stove lamp does not work.At closing time, short switch switches and disconnects (short switch disconnections) → major loop switch and upwards switch (major loop switch closed conducting) → signaling switch and switch (the closed conducting of signaling switch) → major loop relay downwards and receive after signaling switch closure Continuity signal, or (the standby) → stove lamp relay disconnecting receives after the closed Continuity signal of signaling switch, upwards switches (disconnecting not conducting) at once.As shown in Figure 2 B, stove lamp does not have electric current to pass through to loop state, and stove lamp is not lit.
3., while closing the door work, stove lamp is bright.Under door is closed state, still state as shown in Figure 2 B of loop, major loop relay and stove lamp relay are to disconnect (standby), press after the beginning key of micro-wave oven, program provides signal, makes all downward closed (conducting) of major loop relay and stove lamp relay.Loop state is state as shown in Figure 2 C, whole loop conducting work, and stove lamp has electric current to pass through, and stove lamp is lit.
4. after micro-wave oven quits work, state is as shown in Figure 2 B got back in loop, and stove lamp does not have electric current to pass through, and stove lamp is not lit.
Like this, after realization door is opened, stove lamp is bright.Close behind the door, lamp is dark.When work, the function that stove lamp is bright.
But the problem of above-mentioned control circuit is, need to control stove lamp relay, thereby increase the cost of product.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of controlling circuit of microwave oven, can omit a control stove lamp relay.
The present invention be solve the problems of the technologies described above the technical scheme adopting be propose a kind of controlling circuit of microwave oven, be mainly used in controlling the state of stove lamp in micro-wave oven, this controlling circuit of microwave oven comprises major loop change-over switch, short-circuit loop change-over switch, major loop relay and signaling switch, passes through connection between them.Specifically, major loop change-over switch has the first stationary contact, the first normally-closed contact and the first normally opened contact, and major loop change-over switch can connect the first normally-closed contact and the first stationary contact at the first stationary contact and connect between the first normally opened contact two states and switch.The first stationary contact connects one end of power supply, and the first normally-closed contact connects first node, and the first normally opened contact connects Section Point.Short-circuit loop change-over switch has the second stationary contact, the second normally-closed contact and the second normally opened contact, short circuit change-over switch can connect the second normally-closed contact and the second stationary contact at the second stationary contact and connect between the second normally opened contact two states and switch, the second stationary contact connects first node, the second normally-closed contact connects the 3rd node, and the second normally opened contact connects the other end of power supply.One end of major loop relay connects described Section Point, and the other end connects the other end of power supply.Signaling switch switches between can and disconnecting in conducting, and in the time that signaling switch disconnects, major loop relay disconnects.Wherein stove lamp one end of micro-wave oven connects described first node, and the other end connects described Section Point.
The present invention also proposes a kind of control method of above-mentioned controlling circuit of microwave oven, comprises the following steps:
In the time detecting that door of microwave oven is opened, first making described signaling switch disconnect controlling described major loop relay disconnects, then make described major loop change-over switch be switched to the state that the first stationary contact is connected with the first normally opened contact, simultaneously short-circuit loop change-over switch is switched to the state that the second stationary contact is connected with the second normally opened contact, thereby the one end that makes described stove lamp is connected to one end of power supply and the other end of described stove lamp is connected to the other end of power supply and is lit through described short-circuit loop change-over switch through described major loop change-over switch;
In the time detecting that door of microwave oven is closed, first make described signaling switch conducting, then make described major loop change-over switch be switched to the state that described the first stationary contact is connected with described the first normally-closed contact, and described short-circuit loop change-over switch is also switched to the state that described the second stationary contact is connected with described the second normally-closed contact, and described major loop relay disconnects, described stove lamp is extinguished;
When detecting after the key at the beginning of micro-wave oven, make the conducting of described major loop relay, thereby the one end that makes described stove lamp is connected to one end of power supply and the other end of described stove lamp is connected to the other end of power supply and is lit through described major loop relay through described major loop change-over switch; And
In the time detecting that micro-wave oven quits work, described major loop relay is disconnected, described stove lamp is extinguished.
In one embodiment of this invention, electrical appliance also can comprise at least a portion with lower member: fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter, be connected between described the 3rd node and described Section Point, wherein: in the time that major loop relay disconnects, described fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter disconnect; When the conducting of major loop relay, when major loop change-over switch is switched to state that the first stationary contact is connected with the first normally-closed contact and short-circuit loop change-over switch and is also switched to the state that the second stationary contact is connected with the second normally-closed contact, described fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter conducting.Therefore control circuit of the present invention and control method thereof are also controlled the state of stove lamp other electrical appliances in the past simultaneously.
The present invention, owing to adopting above technical scheme, makes it compared with prior art, can omit a relay that price is higher, therefore can reduce the cost of product.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is a kind of microwave oven circuit figure of prior art.
Fig. 2 A-2C illustrates several states of controlling circuit of microwave oven shown in Fig. 1.
Fig. 3 illustrates the microwave oven circuit figure of one embodiment of the invention.
Fig. 4 A-4C illustrates several states of controlling circuit of microwave oven shown in Fig. 3.
The specific embodiment
Fig. 3 illustrates the microwave oven circuit figure of one embodiment of the invention.Shown in Fig. 3, there is a power supply in circuit left side, for example alternating current 220V power supply, and power supply offers the control circuit 10 of the present embodiment after optional noise filter FIL.Control circuit 10 is in order to control the work of each parts in micro-wave oven, and these parts can comprise stove lamp L, fan electromotor M
f, rotary tray motor M
Π, barbecue heating tube R (further controlling by controlling barbecue heating tube relay R Y2) and the high-tension circuit that comprises magnetron G, frequency converter INV.Be appreciated that these parts are only as an example, can change when actual design as required.And in order to make object of the present invention clear, in description below, omit the description of uncorrelated parts.
Specifically, control circuit 10 comprises major loop change-over switch K1, short-circuit loop change-over switch K2, signaling switch K3 and major loop relay R Y1.Although in the present embodiment, major loop change-over switch K1 and short-circuit loop change-over switch K2 can adopt double-throw type microswitch, and signaling switch K3 can adopt open type microswitch, and other double-throw switches that have similar functions are also available.Major loop change-over switch K1 has the first stationary contact, the first normally-closed contact (position 1 in figure) and the first normally opened contact (position 2 in figure), wherein the first stationary contact connects one end (as phase line end) AC3 of AC power, the first normally-closed contact connects first node N1, and the first normally opened contact connects Section Point N2.Short-circuit loop change-over switch K2 also has the second stationary contact, the second normally-closed contact (position 1 in figure) and the second normally opened contact (position 2 in figure), wherein the second stationary contact connects first node N1, the second normally-closed contact connects the 3rd node N3, and the second normally opened contact 2 is connected to the other end (as middle line end) of alternating current.Major loop relay R Y1 one end connects the other end (as the center line) AC4 of AC power, and the other end connects Section Point N2.In addition, signaling switch K3 can control the disconnection of major loop relay R Y1, and the conducting of major loop relay R Y1 needs signaling switch K3 and micro-wave oven to start coordinating of key.Wherein K switch 1, K2 and K3 are all subject to the control of door-opening mechanism, and specifically, K switch 1, K2 and K3 all can be subject to responding stove door switch state and the control of the control signal that produces.
In electrical appliance, one end of stove lamp L connects first node N1, and the other end connects Section Point N2.One end of the electrical appliances such as fan electromotor Mr, rotary tray motor Mt, barbecue heating tube R, high-tension circuit connects the 3rd node N3, and the other end connects Section Point N2.
As shown in Figure 3, when being set to the first stationary contact, major loop change-over switch K1 is connected with the first normally opened contact, and when short-circuit loop change-over switch K2 is set to the second stationary contact and is connected with the second normally opened contact, one end AC3, Section Point, stove lamp L, first node N1 by AC power light stove lamp to the order of the other end AC4 of AC power, this makes to control stove lamp L by independent relay again, provides cost savings thus.
An embodiment of the control method of control circuit is described below in conjunction with accompanying drawing, and major loop change-over switch K1, short-circuit loop change-over switch K2, signaling switch K3 and control major loop relay R Y1 switch successively sequence of movement are:
1., after being opened, stove lamp is bright.In the time that micro-wave oven detects oven door opening, first make signaling switch K3 upwards switch (signaling switch K3 disconnection), major loop relay R Y1 receives after the cut-off signal of signaling switch K3, upwards switch (disconnecting) at once, then make major loop change-over switch K1 be switched to the state that the first stationary contact connects the first normally opened contact downwards, short-circuit loop K switch 2 is switched to the state that the second stationary contact connects the second normally opened contact downwards simultaneously.Loop is state as shown in Figure 4 A, and stove lamp has electric current to pass through, and stove lamp is lit.In addition, other electrical appliances such as fan electromotor, rotary tray motor do not have electric current by quitting work yet.
2., after being closed, stove lamp does not work.In the time that micro-wave oven detects pass fire door, first make signaling switch K3 switch (closed conducting) downwards, then make major loop change-over switch K1 upwards be switched to the state that the first stationary contact connects the first normally-closed contact, and short-circuit loop K switch 2 is also upwards switched to the state that the second stationary contact connects the second normally-closed contact.(standby) that now major loop relay R Y1 still disconnects.Loop is state as shown in Figure 4 B, and stove lamp does not have electric current, and stove lamp is not lit.In addition, other electrical appliances such as fan electromotor, rotary tray motor yet do not have electric current to pass through, and do not start working.
3., while closing the door work, stove lamp is bright.Under door is closed state, loop is state as shown in Figure 4 B, major loop relay R Y1 still disconnects (standby), press after the beginning key of micro-wave oven, program provides signal, makes major loop relay R Y1 closed (conducting) downwards, loop is state as shown in Figure 4 C, the conducting work of whole loop, stove lamp has electric current to pass through, and stove lamp is lit.
4. after micro-wave oven quits work, (automatically finish or manually finished as arranged), make major loop relay R Y1 upwards disconnect (not conducting), loop is state as shown in Figure 4 B, and stove lamp does not have electric current to pass through, and stove lamp is not lit.
Like this, by above-mentioned method flow, after realization door is opened, stove lamp is bright; Close behind the door, stove lamp is dark; When work, the function that stove lamp is bright.
Compare existing controlling circuit of microwave oven, the major loop change-over switch of the embodiment of the present invention and short-circuit loop change-over switch adopt double-throw type microswitch, and cost changes little; But embodiments of the invention have saved stove lamp relay R Y2 in the past, cost, and still can realize due function.Therefore the present invention can reduce the product cost of micro-wave oven.
Although the present invention discloses as above with preferred embodiment; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little modification and perfect, therefore protection scope of the present invention is worked as with being as the criterion that claims were defined.
Claims (5)
1. a controlling circuit of microwave oven, for controlling the state of micro-wave oven electrical appliance, described electrical appliance comprises stove lamp, described controlling circuit of microwave oven comprises:
Major loop change-over switch, there is the first stationary contact, the first normally-closed contact and the first normally opened contact, described major loop change-over switch can connect the first normally-closed contact and the first stationary contact at the first stationary contact and connect between the first normally opened contact two states and switch, described the first stationary contact connects one end of power supply, described the first normally-closed contact connects first node, and described the first normally opened contact connects Section Point;
Short-circuit loop change-over switch, there is the second stationary contact, the second normally-closed contact and the second normally opened contact, described short circuit change-over switch can connect the second normally-closed contact and the second stationary contact at the second stationary contact and connect between the second normally opened contact two states and switch, described the second stationary contact connects described first node, described the second normally-closed contact connects the 3rd node, and described the second normally opened contact connects the other end of power supply;
Major loop relay, its one end connects described Section Point, and the other end connects the other end of power supply; And
Signaling switch, switches between can and disconnecting in conducting, and in the time that described signaling switch disconnects, described major loop relay disconnects;
Wherein said stove lamp one end connects described first node, and the other end connects described Section Point.
2. controlling circuit of microwave oven as claimed in claim 1, it is characterized in that, described electrical appliance also comprises at least a portion with lower member: fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter, be connected between described the 3rd node and described Section Point.
3. controlling circuit of microwave oven as claimed in claim 1, is characterized in that, described major loop change-over switch and/or described short-circuit loop change-over switch are double-throw type microswitches.
4. a control method for controlling circuit of microwave oven as claimed in claim 1, comprises the following steps:
In the time detecting that door of microwave oven is opened, first making described signaling switch disconnect controlling described major loop relay disconnects, then make described major loop change-over switch be switched to the state that the first stationary contact is connected with the first normally opened contact, simultaneously short-circuit loop change-over switch is switched to the state that the second stationary contact is connected with the second normally opened contact, thereby the one end that makes described stove lamp is connected to one end of power supply and the other end of described stove lamp is connected to the other end of power supply and is lit through described short-circuit loop change-over switch through described major loop change-over switch;
In the time detecting that door of microwave oven is closed, first make described signaling switch conducting, then make described major loop change-over switch be switched to the state that described the first stationary contact is connected with described the first normally-closed contact, and described short-circuit loop change-over switch is also switched to the state that described the second stationary contact is connected with described the second normally-closed contact, and described major loop relay disconnects, described stove lamp is extinguished;
When after key is pressed at the beginning of micro-wave oven being detected, make the conducting of described major loop relay, thereby the one end that makes described stove lamp is connected to one end of power supply and the other end of described stove lamp is connected to the other end of power supply and is lit through described major loop relay through described major loop change-over switch; And
In the time detecting that micro-wave oven quits work, described major loop relay is disconnected, described stove lamp is extinguished.
5. control method as claimed in claim 4, described electrical appliance also comprises at least a portion with lower member: fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter, be connected between described the 3rd node and described Section Point, wherein:
In the time that described major loop relay disconnects, described fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter disconnect; And
When the conducting of described major loop relay, when described major loop change-over switch is switched to state that described the first stationary contact is connected with described the first normally-closed contact and described short-circuit loop change-over switch and is also switched to the state that described the second stationary contact is connected with described the second normally-closed contact, described fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910194402.9A CN101995043B (en) | 2009-08-21 | 2009-08-21 | Microwave oven control circuit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910194402.9A CN101995043B (en) | 2009-08-21 | 2009-08-21 | Microwave oven control circuit and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101995043A CN101995043A (en) | 2011-03-30 |
| CN101995043B true CN101995043B (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910194402.9A Expired - Fee Related CN101995043B (en) | 2009-08-21 | 2009-08-21 | Microwave oven control circuit and control method thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109357292B (en) * | 2018-09-12 | 2020-11-03 | 广东美的厨房电器制造有限公司 | Cooking apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2118926U (en) * | 1991-11-09 | 1992-10-14 | 北京海星电子有限公司 | Micro wave heater by low voltage dc power |
| CN1158398A (en) * | 1995-12-30 | 1997-09-03 | Lg电子株式会社 | Grill/convection microwave oven and convection cooking method thereof |
| JP2000161680A (en) * | 1998-11-27 | 2000-06-16 | Toshiba Corp | Heating cooker |
| CN1955558A (en) * | 2005-10-28 | 2007-05-02 | 乐金电子(天津)电器有限公司 | Automatic control system for lighting of microwave oven |
| KR20070084730A (en) * | 2006-02-21 | 2007-08-27 | 주식회사 대우일렉트로닉스 | Circuit for microwave oven |
-
2009
- 2009-08-21 CN CN200910194402.9A patent/CN101995043B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2118926U (en) * | 1991-11-09 | 1992-10-14 | 北京海星电子有限公司 | Micro wave heater by low voltage dc power |
| CN1158398A (en) * | 1995-12-30 | 1997-09-03 | Lg电子株式会社 | Grill/convection microwave oven and convection cooking method thereof |
| JP2000161680A (en) * | 1998-11-27 | 2000-06-16 | Toshiba Corp | Heating cooker |
| CN1955558A (en) * | 2005-10-28 | 2007-05-02 | 乐金电子(天津)电器有限公司 | Automatic control system for lighting of microwave oven |
| KR20070084730A (en) * | 2006-02-21 | 2007-08-27 | 주식회사 대우일렉트로닉스 | Circuit for microwave oven |
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| CN101995043A (en) | 2011-03-30 |
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Granted publication date: 20140528 Termination date: 20190821 |