CN201925975U - High-reliability control circuit for microwave oven - Google Patents
High-reliability control circuit for microwave oven Download PDFInfo
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- CN201925975U CN201925975U CN2011200362818U CN201120036281U CN201925975U CN 201925975 U CN201925975 U CN 201925975U CN 2011200362818 U CN2011200362818 U CN 2011200362818U CN 201120036281 U CN201120036281 U CN 201120036281U CN 201925975 U CN201925975 U CN 201925975U
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Abstract
A high-reliability control circuit for a microwave oven comprises a heater circuit, a drive circuit and an input circuit and is characterized in that the control circuit further comprises a protective circuit; the protective circuit comprises a third relay, a ninth resistor and a fifth triode; a contactor of the third relay is in series connection with contactors of all relays in the heater circuit; the base electrode of the fifth triode is connected with the output end of a singlechip through the ninth resistor; the collector electrode of the fifth triode is connected with a coil of the third relay; and the emitting electrode of the fifth triode is grounded. For the protective circuit, the relays in the heater circuit can work only when the relays and the third relay in the protective circuit are switched on simultaneously; once short circuit occurs in the relays in the heater circuit or the triode in the drive circuit is broken down, the fifth triode and the third relay in the protective circuit can be switched off normally, so as to ensure the normal switch-off of the heater circuit and improve the working reliability of the circuit and the use safety.
Description
Technical field
The utility model relates to a kind of controlling circuit of microwave oven, particularly relates to a kind of controlling circuit of microwave oven with high reliability.
Background technology
Micro-wave oven is a kind of cooking kitchen range with microwave heating of food.Micro-wave oven generally partly is made up of power supply, magnetron, control circuit and cooking cavity etc., power supply provides about 4000 volts of high pressure to magnetron, magnetron is under the power supply excitation, produce microwave continuously, pass through Wave guide system again, be coupled in the cooking cavity, a rotatable stirrer is arranged near the import department of cooking cavity, the reflection that after agitator rotates microwave is had all directions can be evenly distributed in microwave energy in the cooking cavity, thereby heating is placed on the food in the cooking cavity.
In the prior art, the control circuit of micro-wave oven is at heating type (barbecue, microwave or mixing etc.) difference can select different drive circuits to drive the heating element heater work that is complementary with corresponding heating type, but these drive circuits that drive heating element heater work only adopt the tandem compound of single triode and single relay to realize the conducting of heater circuit usually, such circuit structure dependability is not high, in case a certain key element in this drive circuit lost efficacy or damaged, breakdown or relay is short-circuited as triode, the heater circuit at this heating element heater place can be in conducting state all the time, behind the promptly selected a certain heating mode, micro-wave oven will continue heat food, after breaking down, can't cut off heater circuit automatically, can damage entire machine or set off an explosion because of overheated when serious, have bigger potential safety hazard.
Summary of the invention
Technical problem to be solved in the utility model be provide at above-mentioned prior art present situation a kind of after single key element lost efficacy or damaged, can in time cut off circuit and realize self-protecting the high reliability controlling circuit of microwave oven.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of high reliability controlling circuit of microwave oven includes
Heater circuit includes a plurality of heating resistors that are arranged in parallel and the relay that is serially connected in each described heating resistor loop;
Drive circuit includes and drives each described relay governor circuit that opens and closes and the single-chip microcomputer that drives described governor circuit work, and described single-chip microcomputer includes input and output;
Input circuit be used to set the compound mode of described heating resistor, and the input signal of described input circuit is taken from the button on the microwave oven operation panel, and the output of this input circuit links to each other with the input of described single-chip microcomputer;
It is characterized in that: also include a holding circuit; this holding circuit includes the 3rd relay, the 9th resistance and the 5th triode; the contact of described the 3rd relay respectively with described heater circuit in the contact of each described relay be in series; the base stage of described the 5th triode links to each other through the output of described the 9th resistance and described single-chip microcomputer; the colelctor electrode of the 5th triode links to each other with the coil of described the 3rd relay, the grounded emitter of the 5th triode.
As preferably, described heater circuit can for: include first heating resistor, first relay, second heating resistor and second relay, wherein, contact one end of described first relay links to each other with the civil power zero line through described first heating resistor, contact first end of the contact other end of this first relay and described the 3rd relay links to each other, and contact second end of the 3rd relay links to each other with described civil power live wire; Contact one end of described second relay links to each other with described civil power zero line through described second heating resistor, and the contact other end of this second relay also links to each other with contact first end of described the 3rd relay.Above-mentioned heater circuit has two relays and two heating resistors, can realize the gear selection of two kinds of mode of heatings, promptly have only the mode of heating of the first heating resistor work or have only the mode of heating of the second heating resistor work, according to actual needs, more relay and heating resistor can also be set.
For functional reliability and the safety in utilization that improves governor circuit, as further preferred, described governor circuit includes first triode, second triode, first diode, the 3rd triode, the 4th triode and second diode, wherein, the base stage of described first triode is divided into three the tunnel through second resistance: the first via connects the anode of described first diode, the second the tunnel connects the output of described single-chip microcomputer through first resistance, Third Road connects the emitter stage of this first triode, the grounded emitter of this first triode through the 3rd resistance; The emitter stage of described second triode connects the colelctor electrode of described first triode, and the base stage of this second triode links to each other with the negative electrode of described first diode, and the colelctor electrode of this second triode links to each other with the coil of described first relay; The base stage of described the 3rd triode is divided into three the tunnel through the 5th resistance: the first via connects the anode of described second diode, second path the 4th resistance connects the output of described single-chip microcomputer, Third Road connects the emitter stage of the 3rd triode, the grounded emitter of the 3rd triode through the 6th resistance; The emitter stage of described the 4th triode connects the colelctor electrode of described the 3rd triode, and the base stage of the 4th triode connects the negative electrode of described second diode, and the colelctor electrode of the 4th triode links to each other with the coil of described second relay.So, all be in series with two triodes in the circuit of each relay of control in the governor circuit, when one of them triode puncture or short circuit, another triode still can normally disconnect, make micro-wave oven can in time stop heating, guaranteed the reliability of this circuit working, prevented overheated and cause the damage of product, reduce use dangerous.
Compared with prior art; advantage of the present utility model is: increased by a holding circuit; this holding circuit make the relay in the heater circuit have only with holding circuit in the 3rd relay can work when closed simultaneously; triode in case the relay in the heater circuit is short-circuited in fault or the drive circuit is breakdown; the 5th triode and the 3rd relay in the holding circuit still can normally cut out at this moment; heating element heater can quit work; guaranteed the normal disconnection of heater circuit; prevented because important components and parts such as triode or relay break down and make the problem that circuit can't disconnect; increase the reliability of circuit working, improved safety in utilization.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model embodiment.
The specific embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
As shown in Figure 1, the circuit of present embodiment is a controlling circuit of microwave oven, and this control circuit includes
It is the first heating resistor R7 of 1300W and the second heating resistor R8 that power is 800W that heater circuit 1, this heater circuit include first relay J 1, second relay J 2, power;
Drive circuit 2, include the governor circuit 21 that first relay J 1 that drives in the heater circuit and second relay J 2 open and close, wherein, governor circuit 21 includes the first triode Q1, the second triode Q2, the first diode D1, the 3rd triode Q3, the 4th triode Q4 and the second diode D2, this governor circuit 21 is driven by single-chip microcomputer 22, single-chip microcomputer 22 comprises and input in and output that the output of single-chip microcomputer 22 includes the first output a, the second output b and the 3rd output c;
Holding circuit 4 includes the 3rd relay J 3, the 9th resistance R 9 and the 5th triode Q5.
Wherein, contact one end of first relay J 1 links to each other through the zero line of the first heating resistor R7 and civil power, contact first end of the contact other end of this first relay J 1 and the 3rd relay J 3 links to each other, contact second end of the 3rd relay J 3 and the live wire of civil power link to each other, the coil of the 3rd relay J 3 links to each other with the colelctor electrode of the 5th triode Q5, the base stage of the 5th triode Q5 links to each other the grounded emitter of the 5th triode Q5 through the 3rd output c of the 9th resistance R 9 and single-chip microcomputer 22; Contact one end of second relay J 2 links to each other with the civil power zero line through the second heating resistor R8, and the contact other end of this second relay J 2 also links to each other with contact first end of the 3rd relay J 3;
The base stage of the first triode Q1 is divided into three the tunnel through second resistance R 2: the first via connects the anode of the first diode D1, the second tunnel the first output a through first resistance R, 1 connection single-chip microcomputer 22, Third Road is through the emitter stage of the 3rd resistance R 3 this first triode of connection Q1, the grounded emitter of this first triode Q1; The emitter stage of the second triode Q2 connects the colelctor electrode of the first triode Q1, and the base stage of this second triode Q2 and the negative electrode of the first diode D1 link to each other, and the colelctor electrode of this second triode Q2 and the coil of first relay J 1 link to each other; The base stage of the 3rd triode Q3 is divided into three the tunnel through the 5th resistance R 5: the first via connects the anode of the second diode D2, second path the 4th resistance R 4 connects the second output b of single-chip microcomputer 22, Third Road is through the emitter stage of the 6th resistance R 6 connections the 3rd triode Q3, the grounded emitter of the 3rd triode Q3; The emitter stage of the 4th triode Q4 connects the colelctor electrode of the 3rd triode Q3, and the base stage of the 4th triode Q4 connects the negative electrode of the second diode D2, and the colelctor electrode of the 4th triode Q4 links to each other with the coil of second relay J 2.
Present embodiment is connected on the contact of the 3rd relay J 3 the current loop front end of second relay J 2 of first relay J 1, the 3rd relay J 3 plays the effect of a main switching control, have only when first relay J 1 and the 3rd relay J 3 are closed simultaneously, the first heating resistor R7 can work, in like manner, have only when second relay J 2 and the 3rd relay J 3 are closed simultaneously, the second heating resistor R8 can work, compare with the circuit of the single component structure of employing in heating circuit, present embodiment has increased the quantity of components and parts in same current loop, and the probability that two components and parts break down simultaneously is more much lower than the probability that single components and parts break down, and has also just increased the reliability and the security of circuit working thus;
In addition, in governor circuit 21, originally had only a triode to link to each other with the corresponding relays coil, in case this triode breaks down, then corresponding relays just is in conducting state all the time, present embodiment is improved to an original triode form of two triode series connection, as long as there is the triode can operate as normal, the corresponding relay that is connected in this loop just can disconnect, heater circuit can normally disconnect, have only when two triodes are short-circuited simultaneously or are breakdown, heater circuit just remains conducting, and the probability that two triodes damage simultaneously is also low than single triode damage probability far away, has further increased the reliability of circuit.
The control circuit of present embodiment can increase the reliability of micro-wave oven heater circuit, preventing from may exist in the prior art circuits because of some key element loses efficacy or damages causes micro-wave oven to continue the problem that heats, owing in heating circuit, increased component number, situation from actual components and parts inefficacy or damage, wherein any one relay or triode lost efficacy and the phenomenon that micro-wave oven heats always can not occur, can satisfy the regulation of " the test simulation single failure mode " that comprise in the national standard " 19.11.3 bar among the GB4706.1.2005 ", improve the product safety performance.
Claims (3)
1. a high reliability controlling circuit of microwave oven includes
Heater circuit includes a plurality of heating resistors that are arranged in parallel and the relay that is serially connected in each described heating resistor loop;
Drive circuit includes and drives each described relay governor circuit that opens and closes and the single-chip microcomputer that drives described governor circuit work, and described single-chip microcomputer includes input and output;
Input circuit be used to set the compound mode of described heating resistor, and the input signal of described input circuit is taken from the button on the microwave oven operation panel, and the output of this input circuit links to each other with the input of described single-chip microcomputer;
It is characterized in that: also include a holding circuit; this holding circuit includes the 3rd relay, the 9th resistance and the 5th triode; the contact of described the 3rd relay respectively with described heater circuit in the contact of each described relay be in series; the base stage of described the 5th triode links to each other through the output of described the 9th resistance and described single-chip microcomputer; the colelctor electrode of the 5th triode links to each other with the coil of described the 3rd relay, the grounded emitter of the 5th triode.
2. high reliability controlling circuit of microwave oven according to claim 1, it is characterized in that: described heater circuit includes first heating resistor, first relay, second heating resistor and second relay, wherein, contact one end of described first relay links to each other with the civil power zero line through described first heating resistor, contact first end of the contact other end of this first relay and described the 3rd relay links to each other, and contact second end of the 3rd relay links to each other with described civil power live wire; Contact one end of described second relay links to each other with described civil power zero line through described second heating resistor, and the contact other end of this second relay also links to each other with contact first end of described the 3rd relay.
3. high reliability controlling circuit of microwave oven according to claim 2, it is characterized in that: described governor circuit includes first triode, second triode, first diode, the 3rd triode, the 4th triode and second diode, wherein, the base stage of described first triode is divided into three the tunnel through second resistance: the first via connects the anode of described first diode, the second the tunnel connects the output of described single-chip microcomputer through first resistance, Third Road connects the emitter stage of this first triode, the grounded emitter of this first triode through the 3rd resistance; The emitter stage of described second triode connects the colelctor electrode of described first triode, and the base stage of this second triode links to each other with the negative electrode of described first diode, and the colelctor electrode of this second triode links to each other with the coil of described first relay;
The base stage of described the 3rd triode is divided into three the tunnel through the 5th resistance: the first via connects the anode of described second diode, second path the 4th resistance connects the output of described single-chip microcomputer, Third Road connects the emitter stage of the 3rd triode, the grounded emitter of the 3rd triode through the 6th resistance; The emitter stage of described the 4th triode connects the colelctor electrode of described the 3rd triode, and the base stage of the 4th triode connects the negative electrode of described second diode, and the colelctor electrode of the 4th triode links to each other with the coil of described second relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200362818U CN201925975U (en) | 2011-01-28 | 2011-01-28 | High-reliability control circuit for microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200362818U CN201925975U (en) | 2011-01-28 | 2011-01-28 | High-reliability control circuit for microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201925975U true CN201925975U (en) | 2011-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200362818U Expired - Lifetime CN201925975U (en) | 2011-01-28 | 2011-01-28 | High-reliability control circuit for microwave oven |
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| Country | Link |
|---|---|
| CN (1) | CN201925975U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106627038A (en) * | 2016-12-19 | 2017-05-10 | 杭州先途电子有限公司 | Heating switching circuit |
| CN107504526A (en) * | 2017-07-11 | 2017-12-22 | 宁波高新区敦和科技有限公司 | The energy-saving control method and control system of a kind of micro-wave oven |
-
2011
- 2011-01-28 CN CN2011200362818U patent/CN201925975U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106627038A (en) * | 2016-12-19 | 2017-05-10 | 杭州先途电子有限公司 | Heating switching circuit |
| CN107504526A (en) * | 2017-07-11 | 2017-12-22 | 宁波高新区敦和科技有限公司 | The energy-saving control method and control system of a kind of micro-wave oven |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110810 |