CN101995043A - Microwave oven control circuit and control method thereof - Google Patents
Microwave oven control circuit and control method thereof Download PDFInfo
- Publication number
- CN101995043A CN101995043A CN2009101944029A CN200910194402A CN101995043A CN 101995043 A CN101995043 A CN 101995043A CN 2009101944029 A CN2009101944029 A CN 2009101944029A CN 200910194402 A CN200910194402 A CN 200910194402A CN 101995043 A CN101995043 A CN 101995043A
- Authority
- CN
- China
- Prior art keywords
- major loop
- switch
- contact
- normally
- over switch
- 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.)
- Granted
Links
Images
Landscapes
- Electric Ovens (AREA)
- Electric Stoves And Ranges (AREA)
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 micro-wave oven stove lamp, especially relate to a kind of controlling circuit of microwave oven that reduces cost and control method thereof.
Background technology
The micro-wave oven of frequency converter machine has particular requirement in control at present: when door was opened, the stove lamp was bright; Door is closed behind the door, and the stove lamp is dark; During micro-wave oven work, the stove lamp is bright.This function can see clearly easily open the door after, the situation in the furnace chamber of micro-wave oven after the food heating.Usually this function of realization is controlled by control stove lamp relay and program on the control circuit board.
Fig. 1 illustrates the circuit diagram of existing micro-wave oven.With reference to shown in Figure 1, the left side is the alternating current 220V power supply in the circuit, behind noise filter FIL, to control 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 the open type microswitch, and short switch is to use the closed type microswitch, and signaling switch is to adopt the open type microswitch.The major loop switch can be controlled fan electromotor M
F, rotary tray motor M
∏, device such as barbecue heating tube R, the right side is the magnetron G of micro-wave oven, the device work of frequency converter INV, whether incorporates operating circuit of microwave oven into by short switch K2 decision.
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 was opened, the stove lamp was bright.When opening the door, after the major loop switch switches (the major loop switch disconnects not conducting) → signaling switch downwards and upwards switches (signaling switch disconnections) → short switch closure (conducting of short switch closure) → the major loop relay receives the signaling switch cut-off signal, after upwards switching (disconnection) → stove lamp relay receives the signaling switch cut-off signal at once, switch downwards (closed conducting) at once.Loop state is shown in Fig. 2 A, and the stove lamp has electric current to pass through, and the stove lamp is lighted.
2. after fire door was closed, the stove lamp did not work.At closing time, after short switch switch to disconnect (short switch disconnections) → major loop switch and upwards switches (conducting of major loop switch closure) → signaling switch and switch (the closed conducting of signaling switch) → major loop relay downwards and receive signaling switch closure Continuity signal, still after (the being ready) → stove lamp relay that disconnects receives the closed Continuity signal of signaling switch, upwards switch (disconnecting not conducting) at once.Loop state is shown in Fig. 2 B, and the stove lamp does not have electric current to pass through, and the stove lamp is not lighted.
3. when closing the door work, the stove lamp is bright.Under door is closed state, the loop is state shown in Fig. 2 B still, and major loop relay and stove lamp relay are after disconnecting (being ready), pressing the beginning key of micro-wave oven, program provides signal, makes major loop relay and stove lamp relay all downward closed (conducting).Loop state is state shown in Fig. 2 C, whole loop conducting work, and the stove lamp has electric current to pass through, and the stove lamp is lighted.
4. after micro-wave oven quit work, state shown in Fig. 2 B was got back in the loop, and the stove lamp does not have electric current to pass through, and the stove lamp is not lighted.
Like this, after the realization door was opened, the stove lamp was bright.Close behind the door, lamp is dark.During work, the function that the stove lamp is bright.
Yet the problem of above-mentioned control circuit is, needs control stove lamp relay, thereby has increased the cost of product.
Summary of the invention
Technical problem to be solved by this invention provides a kind of controlling circuit of microwave oven, can omit a control stove lamp relay.
The present invention is that to solve the problems of the technologies described above the technical scheme that adopts be to propose a kind of controlling circuit of microwave oven, be mainly used in the state of stove lamp in the control 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, connects by circuit between them.Specifically, the major loop change-over switch has first stationary contact, first normally-closed contact and first normally opened contact, and the major loop change-over switch can connect first normally-closed contact and first stationary contact at first stationary contact and connect between the first normally opened contact two states and switch.First stationary contact connects an end of power supply, and first normally-closed contact connects first node, and first normally opened contact connects Section Point.The short-circuit loop change-over switch has second stationary contact, second normally-closed contact and second normally opened contact, the short circuit change-over switch can connect second normally-closed contact and second stationary contact at second stationary contact and connect between the second normally opened contact two states and switch, second stationary contact connects first node, second normally-closed contact connects the 3rd node, and 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 when signaling switch disconnected, the major loop relay disconnected.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, may further comprise the steps:
When detecting door of microwave oven and open, described signaling switch is disconnected to control described major loop relay to be disconnected, make described major loop change-over switch switch to the state that first stationary contact is connected with first normally opened contact then, simultaneously the short-circuit loop change-over switch switches to the state that second stationary contact is connected with second normally opened contact, thereby an end that makes described stove lamp is connected to end of power supply and described stove lamp through described major loop change-over switch the other end is connected to the other end of power supply and is lighted through described short-circuit loop change-over switch;
When detecting door of microwave oven and close, make described signaling switch conducting earlier, make described major loop change-over switch switch to the state that described first stationary contact is connected with described first normally-closed contact then, and described short-circuit loop change-over switch also switches to the state that described second stationary contact is connected with described second normally-closed contact, and described major loop relay disconnects, and described stove lamp is extinguished;
Behind the key at the beginning that detects micro-wave oven, make the conducting of described major loop relay, thereby an end that makes described stove lamp is connected to end of power supply and described stove lamp through described major loop change-over switch the other end is connected to the other end of power supply and is lighted through described major loop relay; And
When detecting micro-wave oven and quit 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 the described Section Point, wherein: when the major loop relay disconnected, described fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter disconnected; When the conducting of major loop relay, when the major loop change-over switch switches to state that first stationary contact is connected with first normally-closed contact and short-circuit loop change-over switch and also switches to second stationary contact with state that second normally-closed contact is connected, 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 makes it compared with prior art owing to adopt above technical scheme, can omit a relay that price is higher, therefore can reduce the cost of product.
Description of drawings
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 Figure 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 Figure 3.
The specific embodiment
Fig. 3 illustrates the microwave oven circuit figure of one embodiment of the invention.With reference to shown in Figure 3, there is a power supply in the circuit left side, alternating current 220V power supply for example, and power supply is through offering the control circuit 10 of present embodiment behind the optional noise filter FIL.Control circuit 10 is in order to the work of each parts in the control micro-wave oven, and these parts can comprise stove lamp L, fan electromotor M
F, rotary tray motor M
∏, barbecue heating tube R (Y2 further controls by control barbecue heating tube relay R) and the high-tension circuit that comprises magnetron G, frequency converter INV.Be appreciated that these parts only are as an example, can change during actual design as required.And, omitted the description of uncorrelated parts in the following description in order to make purpose of the present invention clear.
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.Though 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 the open type microswitch, and other double-throw switches that similar functions is arranged also are available.Major loop change-over switch K1 has first stationary contact, first normally-closed contact (position 1 among the figure) and first normally opened contact (position 2 among the figure), wherein first stationary contact connects an end (as the phase line end) AC3 of AC power, first normally-closed contact connects first node N1, and first normally opened contact connects Section Point N2.Short-circuit loop change-over switch K2 also has second stationary contact, second normally-closed contact (position 1 among the figure) and second normally opened contact (position 2 among the figure), wherein second stationary contact connects first node N1, second normally-closed contact connects the 3rd node N3, and 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 begin cooperating of key.Wherein K switch 1, K2 and K3 all are subjected to the control of door-opening mechanism, and specifically, K switch 1, K2 and K3 all can be subjected to responding the stove door switch state and the control of the control signal that produces.
In electrical appliance, the end of stove lamp L connects first node N1, and the other end connects Section Point N2.One end of 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 first stationary contact, major loop change-over switch K1 is connected with first normally opened contact, and when short-circuit loop change-over switch K2 is set to second stationary contact and is connected with second normally opened contact, an end AC3, Section Point, stove lamp L, first node N1 by AC power light the stove lamp to the order of the other end AC4 of AC power, this makes needn't 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 door was opened, the stove lamp was bright.When micro-wave oven detects oven door opening, make signaling switch K3 upwards switch (signaling switch K3 disconnection) earlier, after major loop relay R Y1 receives the cut-off signal of signaling switch K3, upwards switch (promptly disconnecting) at once, make major loop change-over switch K1 switch to the state that first stationary contact connects first normally opened contact downwards then, short-circuit loop K switch 2 switches to the state that second stationary contact connects second normally opened contact downwards simultaneously.The loop is state shown in Fig. 4 A, and the stove lamp has electric current to pass through, and the stove lamp is lighted.In addition, other electrical appliances such as fan electromotor, rotary tray motor do not have electric current by quitting work yet.
2. after door was closed, the stove lamp did not work.When micro-wave oven detects the pass fire door, make signaling switch K3 switch (closed conducting) downwards earlier, make major loop change-over switch K1 upwards switch to the state that first stationary contact connects first normally-closed contact then, and short-circuit loop K switch 2 also upwards switch to the state that second stationary contact connects second normally-closed contact.(being ready) that this moment, major loop relay R Y1 still disconnected.The loop is state shown in Fig. 4 B, and the stove lamp does not have electric current, and the stove lamp is not lighted.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. when closing the door work, the stove lamp is bright.Under door is closed state, the loop is state shown in Fig. 4 B, major loop relay R Y1 still disconnects (being ready), after pressing the beginning key of micro-wave oven, program provides signal, makes major loop relay R Y1 closed (conducting) downwards, the loop is state shown in Fig. 4 C, the conducting work of whole loop, the stove lamp has electric current to pass through, and the stove lamp is lighted.
4. the micro-wave oven back (as arranging automatic end or manually being finished) that quits work makes major loop relay R Y1 upwards disconnect (not conducting), and the loop is state shown in Fig. 4 B, and the stove lamp does not have electric current to pass through, and the stove lamp is not lighted.
Like this, by above-mentioned method flow, after the realization door was opened, the stove lamp was bright; Close behind the door, the stove lamp is dark; During work, the function that the stove lamp is bright.
Compare existing controlling circuit of microwave oven, the major loop change-over switch of the embodiment of the 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, and cost reduces, and still can realize due function.Therefore the present invention can reduce the product cost of micro-wave oven.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (5)
1. controlling circuit of microwave oven is used for controlling the state of micro-wave oven electrical appliance, and described electrical appliance comprises the stove lamp, and described controlling circuit of microwave oven comprises:
The major loop change-over switch, have first stationary contact, first normally-closed contact and first normally opened contact, described major loop change-over switch can connect first normally-closed contact and first stationary contact at first stationary contact and connect between the first normally opened contact two states and switch, described first stationary contact connects an end of power supply, described first normally-closed contact connects first node, and described first normally opened contact connects Section Point;
The short-circuit loop change-over switch, have second stationary contact, second normally-closed contact and second normally opened contact, described short circuit change-over switch can connect second normally-closed contact and second stationary contact at second stationary contact and connect between the second normally opened contact two states and switch, described second stationary contact connects described first node, described second normally-closed contact connects the 3rd node, and described second normally opened contact connects the other end of power supply;
The major loop relay, the 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 when described signaling switch disconnected, described major loop relay disconnected;
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 are connected between described the 3rd node and the 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. the control method of a controlling circuit of microwave oven as claimed in claim 1 may further comprise the steps:
When detecting door of microwave oven and open, described signaling switch is disconnected to control described major loop relay to be disconnected, make described major loop change-over switch switch to the state that first stationary contact is connected with first normally opened contact then, simultaneously the short-circuit loop change-over switch switches to the state that second stationary contact is connected with second normally opened contact, thereby an end that makes described stove lamp is connected to end of power supply and described stove lamp through described major loop change-over switch the other end is connected to the other end of power supply and is lighted through described short-circuit loop change-over switch;
When detecting door of microwave oven and close, make described signaling switch conducting earlier, make described major loop change-over switch switch to the state that described first stationary contact is connected with described first normally-closed contact then, and described short-circuit loop change-over switch also switches to the state that described second stationary contact is connected with described second normally-closed contact, and described major loop relay disconnects, and described stove lamp is extinguished;
Behind the key at the beginning that detects micro-wave oven, make the conducting of described major loop relay, thereby an end that makes described stove lamp is connected to end of power supply and described stove lamp through described major loop change-over switch the other end is connected to the other end of power supply and is lighted through described major loop relay; And
When detecting micro-wave oven and quit 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 the described Section Point, wherein:
When described major loop relay disconnected, described fan electromotor, rotary tray motor, barbecue heating tube, magnetron, frequency converter disconnected; And
When the conducting of described major loop relay, when described major loop change-over switch switches to state that described first stationary contact is connected with described first normally-closed contact and described short-circuit loop change-over switch and also switches to described second stationary contact with state that described second normally-closed contact is connected, 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101995043A true CN101995043A (en) | 2011-03-30 |
| CN101995043B CN101995043B (en) | 2014-05-28 |
Family
ID=43785540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910194402.9A Expired - Fee Related CN101995043B (en) | 2009-08-21 | 2009-08-21 | Microwave oven control circuit and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101995043B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357292A (en) * | 2018-09-12 | 2019-02-19 | 广东美的厨房电器制造有限公司 | Cooking equipment |
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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357292A (en) * | 2018-09-12 | 2019-02-19 | 广东美的厨房电器制造有限公司 | Cooking equipment |
| CN109357292B (en) * | 2018-09-12 | 2020-11-03 | 广东美的厨房电器制造有限公司 | Cooking apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101995043B (en) | 2014-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100417863C (en) | Fume guide device for wall-mounted microwave oven | |
| CN104110800B (en) | The method of controlling switch of resistive load, system and air-conditioner | |
| CN105785879A (en) | Door switch circuit used for household appliances and the household appliances | |
| CN104480671A (en) | Power-on control device for full-automatic washing machine | |
| CN101995043B (en) | Microwave oven control circuit and control method thereof | |
| JPH03192674A (en) | Heater control circuit | |
| CN202872319U (en) | Burnout-proof automatic protection device of a high voltage circuit breaker closing coil | |
| CN201341795Y (en) | Rice cooker and control circuit thereof | |
| CN112994222B (en) | ATS switch control circuit and control method | |
| CN105406447A (en) | Closing coil protection apparatus | |
| CN202261899U (en) | Microwave oven door-opening electrification circuit | |
| CN107895678A (en) | A kind of automatic divide-shut brake breaker | |
| CN103295848A (en) | Electric measurement and control module used indoors | |
| CN103811221A (en) | Magnetic control anti-explosion remote control synchronous safety switch | |
| CN208547825U (en) | The timing control circuit and cooking machine of cooking machine | |
| CN207124572U (en) | A kind of bi-motor automatic switching control circuit | |
| CN111785548B (en) | Electrical interlocking of dual-power automatic transfer switch and dual-power automatic transfer switch | |
| CN110474594A (en) | A kind of control circuit, blower and control method | |
| CN201540480U (en) | Remote control device for substation illumination and fan systems | |
| US7109454B2 (en) | Microwave oven | |
| US20110234018A1 (en) | Control circuit for an electronic household appliance | |
| CN217641142U (en) | Remote-control electronic energy-saving safety switch | |
| CN109357292A (en) | Cooking equipment | |
| JP2006200757A (en) | Heating device | |
| CN213484297U (en) | Electric control box of heat flow breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |
Granted publication date: 20140528 Termination date: 20190821 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |