CN201904603U - Temperature accurate detection and protection circuit of induction cooker - Google Patents
Temperature accurate detection and protection circuit of induction cooker Download PDFInfo
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- CN201904603U CN201904603U CN2010206778786U CN201020677878U CN201904603U CN 201904603 U CN201904603 U CN 201904603U CN 2010206778786 U CN2010206778786 U CN 2010206778786U CN 201020677878 U CN201020677878 U CN 201020677878U CN 201904603 U CN201904603 U CN 201904603U
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Abstract
The utility model provides a temperature accurate detection and protection circuit of an induction cooker. The temperature accurate detection and protection circuit comprises a temperature detection circuit, a reference comparison voltage output circuit, a voltage comparison circuit, an output signal feedback circuit, a push-pull driving output circuit and a relay, and is characterized in that an output terminal of the temperature detection circuit and an output terminal of the reference comparison voltage output circuit are respectively connected with an input terminal of the voltage comparison circuit; an output terminal of the voltage comparison circuit is connected with an input terminal of the output signal feedback circuit and an input terminal of the push-pull driving output circuit; an output terminal of the output signal feedback circuit is connected with an input terminal of the reference comparison voltage output circuit; and an input terminal of the push-pull driving output circuit is connected with an input terminal of the relay. According to the scheme, the temperature of the bottom of the cooker is detected through a thermistor of the temperature detection circuit; and when the temperature is high, the output level of a comparator of the voltage comparison circuit is turned from a high level to a low level, a power supply source of the relay is cut off by the push-pull driving output circuit, and then the relay is disconnected and a heating loop of the induction cooker is cut off, thereby achieving high temperature hardware protection.
Description
Technical field
The temperature that the utility model relates to a kind of electromagnetic oven accurately detects and protective circuit, belongs to the innovative technology of electromagnetic oven high temperature hardware protection.
Background technology
Present electromagnetic oven product; the mechanical spring-piece type thermal protector of general employing carries out high temperature protection; because mechanical spring-piece type thermal protector is subjected to the restriction of material; make protector protection point on the low side; protector can not be close to the ceramic wafer under the bottom of a pan, and the temperature control error is big, causes boiling under the oily operating mode at high temperature; occur the inaccurate and misoperation phenomenon of temperature control easily, cause the properties of product defective.
Summary of the invention
The purpose of this utility model is to consider the problems referred to above and provides a kind of and can choose pan high temperature protection point arbitrarily by circuit, and temperature control accuracy height accurately detects and protective circuit thereby satisfy the temperature of boiling the electromagnetic oven that properties of product require under the oily operating mode at high temperature.
The technical solution of the utility model is: a kind of temperature of electromagnetic oven accurately detects and protective circuit; comprise temperature sensing circuit; benchmark comparative voltage output circuit; voltage comparator circuit; the output signal feedback circuit; recommend and drive output circuit and relay; the output that it is characterized in that described temperature sensing circuit and benchmark comparative voltage output circuit is connected with the input of voltage comparator circuit respectively; the output of voltage comparator circuit is connected with the input of recommending the driving output circuit with the output signal feedback circuit; the output of output signal feedback circuit is connected with the input of benchmark comparative voltage output circuit, recommends the output that drives output circuit and is connected with the input of relay.
Described temperature sensing circuit comprises thermistor RT1 and resistance R 3, wherein an end of the end of thermistor RT1 and resistance R 3 is connected with "-" input of voltage comparator circuit 3 respectively, the other end of thermistor RT1 is connected with power Vcc 1, the other end ground connection of resistance R 3.
Described benchmark comparative voltage output circuit comprises resistance R 1 and resistance R 2, and wherein an end of an end of resistance R 1 and resistance R 2 is connected with "+" input of voltage comparator circuit 3 respectively, and the other end of resistance R 1 is connected with power Vcc 1, the other end ground connection of resistance R 2.
Described voltage comparator circuit comprises capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 and electric capacity EC1, resistance R 4 and comparator U1, and wherein an end of capacitor C 1 is connected other end ground connection with "+" input of comparator U1; One end of capacitor C 2 is connected other end ground connection with "-" input of comparator U1; Capacitor C 3 is in parallel with electric capacity EC1, and an end in parallel is connected on the circuit between the input port of power Vcc 2 and comparator U1, other end ground connection; One end of resistance R 4 is connected with power Vcc 2, and the other end is connected with the output of comparator U1; One end of capacitor C 4 is connected other end ground connection with the output of comparator U1.
Described output signal feedback circuit comprises resistance R 5 and diode D1, wherein resistance R 5 and diode D1 series connection, and the other end of resistance R 5 is connected with "+" input of comparator U1; The negative terminal of diode D1 is connected with the output of comparator U1.
The described driving output circuit of recommending comprises resistance R 6, resistance R 7, NPN triode Q1 and PNP triode Q2, and wherein an end of resistance R 6 is connected with the output of comparator U1, and the other end is connected with the base stage of NPN triode Q1; One end of resistance R 7 is connected with the output of comparator U1, and the other end is connected with the base stage of PNP triode Q2; The collector electrode of NPN triode Q1 is connected with power Vcc 2, and emitter is connected with the emitter of PNP triode Q2; The grounded collector of PNP triode Q2; The emitter of NPN triode Q1 and PNP triode Q2 is connected with relay 6.
The utility model its beneficial effect compared with prior art is as follows: the utility model detects cooking bottom temperature by the thermistor of temperature sensing circuit; temperature characterisitic according to thermistor; the output of the comparator of voltage comparator circuit is low level by the high level upset during high temperature; recommending the driving output circuit is cut off the power supply VCC2 of relay coil; relay disconnects; cut off the electromagnetic oven heating loop; realize the high temperature hardware protection; and when the electromagnetic oven high temperature protection; the problem that protective circuit is switched rapidly between protecting and not protecting back and forth can not appear; the output signal feedback circuit is set recovery temperature point behind the high temperature protection according to circuit parameter design; recommend the driving output circuit simultaneously and guarantee any open circuit or short circuit in the triode, can not make the defencive function of protective circuit lose efficacy.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the circuit diagram of embodiment of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1; the temperature of the utility model electromagnetic oven accurately detects and protective circuit; comprise temperature sensing circuit 1; benchmark comparative voltage output circuit 2; voltage comparator circuit 3; output signal feedback circuit 4; recommend and drive output circuit 5 and relay 6; the output of wherein said temperature sensing circuit 1 and benchmark comparative voltage output circuit 2 is connected with the input of voltage comparator circuit 3 respectively; the output of voltage comparator circuit 3 is connected with the input of recommending driving output circuit 5 with output signal feedback circuit 4; the output of output signal feedback circuit 4 is connected with the input of benchmark comparative voltage output circuit 2, recommends the output that drives output circuit 5 and is connected with the input of relay 6.
As shown in Figure 2, described temperature sensing circuit 1 comprises thermistor RT1 and resistance R 3, wherein an end of the end of thermistor RT1 and resistance R 3 is connected with "-" input of voltage comparator circuit 3 respectively, and the other end of thermistor RT1 is connected with power Vcc 1, the other end ground connection of resistance R 3.
Described benchmark comparative voltage output circuit 2 comprises resistance R 1 and resistance R 2, wherein an end of an end of resistance R 1 and resistance R 2 is connected with "+" input of voltage comparator circuit 3 respectively, the other end of resistance R 1 is connected with power Vcc 1, the other end ground connection of resistance R 2.
Described voltage comparator circuit 3 comprises capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4 and electric capacity EC1, resistance R 4 and comparator U1, and wherein an end of capacitor C 1 is connected other end ground connection with "+" input of comparator U1; One end of capacitor C 2 is connected other end ground connection with "-" input of comparator U1; Capacitor C 3 is in parallel with electric capacity EC1, and an end in parallel is connected on the circuit between the input port of power Vcc 2 and comparator U1, other end ground connection; One end of resistance R 4 is connected with power Vcc 2, and the other end is connected with the output of comparator U1; One end of capacitor C 4 is connected other end ground connection with the output of comparator U1.
Described output signal feedback circuit 4 comprises resistance R 5 and diode D1, wherein resistance R 5 and diode D1 series connection, and the other end of resistance R 5 is connected with "+" input of comparator U1; The negative terminal of diode D1 is connected with the output of comparator U1.
The described driving output circuit 5 of recommending comprises resistance R 6, resistance R 7, NPN triode Q1 and PNP triode Q2, and wherein an end of resistance R 6 is connected with the output of comparator U1, and the other end is connected with the base stage of NPN triode Q1; One end of resistance R 7 is connected with the output of comparator U1, and the other end is connected with the base stage of PNP triode Q2; The collector electrode of NPN triode Q1 is connected with power Vcc 2, and emitter is connected with the emitter of PNP triode Q2; The grounded collector of PNP triode Q2; The emitter of NPN triode Q1 and PNP triode Q2 is connected with relay 6.
The utility model operation principle is as follows:
When thermistor RT1 cold conditions, the thermistor resistance is bigger, the detected magnitude of voltage of temperature sensing circuit is less, comparator "+" input is than "-" input terminal voltage height, comparator output high level, NPN triode Q1 conducting, power supply VCC2 normal power supply is given relay coil, be connected on the relay adhesive of heating circuit, the electromagnetic oven operate as normal.
When thermistor raises with temperature; the thermistor resistance diminishes gradually; the detected magnitude of voltage of temperature sensing circuit increases; comparator "+" input is lower than "-" input terminal voltage, and comparator is a low level by original high level upset, and NPN triode Q1 ends; the power supply VCC2 of relay coil is cut off; the relay that is connected on heating circuit disconnects, and electromagnetic oven quits work, and realizes the electromagnetic oven high temperature protection.
After electromagnetic oven quits work, thermistor temp descends gradually, it is big that resistance also becomes thereupon, when the detected magnitude of voltage of temperature sensing circuit is reduced to less than reference voltage value, be comparator "+" input than "-" input terminal voltage height, comparator output high level, NPN triode Q1 conducting, power supply VCC2 normal power supply is given relay, and electromagnetic oven returns to controllable state.
Claims (6)
1. the temperature of an electromagnetic oven accurately detects and protective circuit; comprise temperature sensing circuit (1); benchmark comparative voltage output circuit (2); voltage comparator circuit (3); output signal feedback circuit (4); recommend and drive output circuit (5) and relay (6); the output that it is characterized in that described temperature sensing circuit (1) and benchmark comparative voltage output circuit (2) is connected with the input of voltage comparator circuit (3) respectively; the output of voltage comparator circuit (3) is connected with the input of recommending driving output circuit (5) with output signal feedback circuit (4); the output of output signal feedback circuit (4) is connected with the input of benchmark comparative voltage output circuit (2), recommends the output that drives output circuit (5) and is connected with the input of relay (6).
2. the temperature of electromagnetic oven according to claim 1 accurately detects and protective circuit; it is characterized in that described temperature sensing circuit (1) comprises thermistor (RT1) and resistance (R3); wherein an end of an end of thermistor (RT1) and resistance (R3) is connected with "-" input of voltage comparator circuit (3) respectively; the other end of thermistor (RT1) is connected with power supply (Vcc1), the other end ground connection of resistance R 3.
3. the temperature of electromagnetic oven according to claim 2 accurately detects and protective circuit; it is characterized in that described benchmark comparative voltage output circuit (2) comprises resistance (R1) and resistance (R2); wherein an end of an end of resistance (R1) and resistance (R2) is connected with "+" input of voltage comparator circuit (3) respectively; the other end of resistance (R1) is connected with power supply (Vcc1), the other end ground connection of resistance (R2).
4. the temperature of electromagnetic oven according to claim 3 accurately detects and the circuit of protection, it is characterized in that described voltage comparator circuit (3) comprises electric capacity (C1), electric capacity (C2), electric capacity (C3), electric capacity (C4) and electric capacity (EC1), resistance (R4) and comparator (U1), wherein an end of electric capacity (C1) is connected other end ground connection with "+" input of comparator (U1); One end of electric capacity (C2) is connected other end ground connection with "-" input of comparator (U1); Electric capacity (C3) is in parallel with electric capacity (EC1), and an end in parallel is connected on the circuit between power supply (Vcc2) and comparator (U1) input port, other end ground connection; One end of resistance (R4) is connected with power supply (Vcc2), and the other end is connected with the output of comparator (U1); One end of electric capacity (C4) is connected other end ground connection with the output of comparator (U1).
5. the temperature of electromagnetic oven according to claim 4 accurately detects and protective circuit, it is characterized in that described output signal feedback circuit (4) comprises resistance (R5) and diode (D1), wherein resistance (R5) and diode (D1) series connection, the other end of resistance (R5) is connected with "+" input of comparator (U1); The negative terminal of diode (D1) is connected with the output of comparator (U1).
6. the temperature of electromagnetic oven according to claim 5 accurately detects and the circuit of protection, it is characterized in that the described driving output circuit (5) of recommending comprises resistance (R6), resistance (R7), NPN triode (Q1) and PNP triode (Q2), wherein an end of resistance (R6) is connected with the output of comparator (U1), and the other end is connected with the base stage of NPN triode (Q1); One end of resistance (R7) is connected with the output of comparator (U1), and the other end is connected with the base stage of PNP triode (Q2); The collector electrode of NPN triode (Q1) is connected with power supply (Vcc2), and emitter is connected with the emitter of PNP triode (Q2); The grounded collector of PNP triode (Q2); The emitter of NPN triode (Q1) and PNP triode (Q2) is connected with relay (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206778786U CN201904603U (en) | 2010-12-24 | 2010-12-24 | Temperature accurate detection and protection circuit of induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206778786U CN201904603U (en) | 2010-12-24 | 2010-12-24 | Temperature accurate detection and protection circuit of induction cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201904603U true CN201904603U (en) | 2011-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206778786U Expired - Lifetime CN201904603U (en) | 2010-12-24 | 2010-12-24 | Temperature accurate detection and protection circuit of induction cooker |
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| Country | Link |
|---|---|
| CN (1) | CN201904603U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235803A (en) * | 2013-06-14 | 2014-12-24 | 海洋王（东莞）照明科技有限公司 | Lamp with active heat dissipating device |
| CN105162087A (en) * | 2015-05-29 | 2015-12-16 | 杭州长川科技股份有限公司 | Power supply protection circuit |
| CN106877287A (en) * | 2017-04-05 | 2017-06-20 | 京东方科技集团股份有限公司 | A kind of thermal-shutdown circuit and driving method |
-
2010
- 2010-12-24 CN CN2010206778786U patent/CN201904603U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104235803A (en) * | 2013-06-14 | 2014-12-24 | 海洋王（东莞）照明科技有限公司 | Lamp with active heat dissipating device |
| CN105162087A (en) * | 2015-05-29 | 2015-12-16 | 杭州长川科技股份有限公司 | Power supply protection circuit |
| CN106877287A (en) * | 2017-04-05 | 2017-06-20 | 京东方科技集团股份有限公司 | A kind of thermal-shutdown circuit and driving method |
| US20180294638A1 (en) * | 2017-04-05 | 2018-10-11 | Boe Technology Group Co., Ltd. | Over-temperature protection circuitry and driving method |
| US10804694B2 (en) * | 2017-04-05 | 2020-10-13 | Boe Technology Group Co., Ltd. | Over-temperature protection circuitry and driving method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGDONG MIDEA KITCHEN APPLIANCE MANUFACTURING CO Free format text: FORMER OWNER: MIDEA ELECTRICAL HEATING APPLIANCES MANUFACTURING CO., LTD., SHUNDE DISTRICT, FOSHAN CITY Effective date: 20131014 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20131014 Address after: 528311 Yongan Road, Beijiao Town, Guangdong District, Foshan, No. 6, No. Patentee after: Guangdong Midea Kitchen Appliance Manufacturing Co., Ltd. Address before: Beijiao Town, Shunde District of Guangdong city of Foshan province Sanle road 528311 No. 19 Patentee before: Midea Electrical Heating Appliances Manufacturing Co., Ltd., Shunde District, Foshan City |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110720 |