CN105203862A - Load detection device and method of commercial induction cooker - Google Patents
Load detection device and method of commercial induction cooker Download PDFInfo
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- CN105203862A CN105203862A CN201410244319.9A CN201410244319A CN105203862A CN 105203862 A CN105203862 A CN 105203862A CN 201410244319 A CN201410244319 A CN 201410244319A CN 105203862 A CN105203862 A CN 105203862A
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Abstract
The invention discloses a load detection device of a commercial induction cooker. The load detection device comprises a high voltage main loop, an IGBT module, an IGBT drive module, a sampling and filtering module, an MCU processor and an electromagnetic induction coil. A current input end of the high voltage main loop is connected with commercial power. A signal output end of the MCU processor is connected with a signal input end of the IGBT drive module. A signal output end of the IGBT drive module is connected with the IGBT module. The IGBT module is connected with a high voltage input end of the high voltage main loop. A signal input end of the MCU processor is connected with the high voltage main loop through the sampling and filtering module. The high voltage main loop is connected with the electromagnetic induction coil. The invention further discloses a load detection method of the commercial induction cooker. The load detection device and method of the commercial induction cooker are simple, practical and convenient, and the circuit design cost is lowered; in addition, triple-detection is realized, the reliability and the stability of load detection are improved, the energy loss of the load detection approaches zero, and the competitiveness of the product is improved.
Description
Technical field
The present invention relates to commercial induction cooker technology, particularly relate to a kind of commercial induction cooker Weight detector and method.
Background technology
The electric current of electric current or high frequency side that traditional household electromagnetic cooker and commercial induction cooker load detecting often sample power frequency side carries out load detecting, the shortcoming of the method to make electromagnetic stove work a period of time, and need at high-pressure side series current mutual inductor, the secondary output of current transformer is utilized to detect, not only cause energy dissipation, and circuit structure complexity is loaded down with trivial details.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of commercial induction cooker Weight detector and method, directly the bypass filter capacitor voltage of high pressure major loop is sampled, detected, not only simple, practical, convenient, and can Optimization Design of Electronic Circuits greatly, reduce circuit design cost, the competitive power of improving product.
For solving the problems of the technologies described above, the present invention proposes a kind of commercial induction cooker Weight detector, it is characterized in that, comprise high pressure major loop, IGBT module, IGBT drive module, sampling filtration module, MCU processor and electromagnetic induction coil, described high pressure main circuit current input end is electrically connected with city, the signal output part of MCU processor connects the signal input part of IGBT drive module, the signal output part of IGBT drive module connects IGBT module, and IGBT module connects the signal input part of high pressure major loop; The signal input part of MCU processor connects high pressure major loop by sampling filtration module; High pressure major loop connects electromagnetic induction coil.
Further, also comprise for detecting above electromagnetic induction coil whether loaded optical sensor, described optical sensor is connected with MCU processor.
Further, also comprise the pressure transducer for detecting load weight, described pressure transducer is connected with MCU processor by signal amplification circuit filter.
Further, the alarm be connected with MCU processor is also comprised.
Further, described high pressure major loop comprises rectifier circuit, differential mode choke coil L1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electromagnetic induction coil, wherein, pin 2 and the pin 3 of rectifier circuit are electrically connected with city, the A end of differential mode choke coil L1 is connected with the pin 1 of rectifier circuit, and the B end of differential mode choke coil L1 connects electric capacity C4; The two ends of the other end connection single-phase rectifier bridge module pin 4, electric capacity C3 of electric capacity C4 connect pin 1 and the pin 4 of rectifier circuit respectively; One end of electric capacity C2 is held with the B of differential mode choke coil L1 and is connected, and the other end of electric capacity C2 connects electric capacity C5, and the other end of electric capacity C5 connects the pin 4 of rectifier circuit; One end of electric capacity C1 connects the B end of differential mode choke coil L1 and the first signal output part of IGBT module respectively, the other end of electric capacity C1 connects electric capacity C6, the other end of electric capacity C6 connects the pin 4 of rectifier circuit and the secondary signal output terminal of IGBT module respectively, electric capacity C2 is connected one end of electromagnetic induction coil with the link of electric capacity C5, and electric capacity C1 and the link of electric capacity C6 are connected the other end of electromagnetic induction coil and the 3rd signal output part of IGBT module respectively; The B end of differential mode choke coil L1 connects the signal input part of sampling filtration module.
For solving the problems of the technologies described above, the invention allows for a kind of commercial induction cooker load detection method, the method comprises the following steps:
Step 1, optical sensor detects the load information above electromagnetic induction coil every the schedule time and is transferred to MCU processor;
Step 2, MCU processor judges whether that load covers the top of electromagnetic induction coil, if any load, then enters next step, if do not have load, repeats step 1;
Step 3, pressure transducer detects the weight information of load and is transferred to MCU processor;
Step 4, MCU processor compares with the referential weight scope Vp of setting is capable the weight of load, if the weight of load is not in referential weight scope Vp, then enters step 8, if the weight information of load is in referential weight scope Vp, then enters next step;
Step 5, high pressure major loop normally works, and MCU processor sends a pot inspection pulse signal every the schedule time to IGBT drive module, and IGBT drive module drives IGBT module work;
Step 6, the operating voltage signal that sampling filtration module obtains high pressure major loop directly flows to MCU processor;
Step 7, MCU processor compares the reference voltage of the operating voltage signal of conveying with setting, if operating voltage signal Vc1 is greater than reference voltage △ V, now non-loaded the or inappropriate judgement of load made by MCU processor, then enter step 8; If operating voltage signal Vc1 is less than reference voltage △ V, now MCU processor make load and load be applicable to judgement, and then start heating schedule, directly load is heated;
Step 8, starts alarm equipment alarm, and does not start heating.
Further, the pot inspection pulse signal that described MCU processor exports is the complementary IGBT drive singal with dead band of two-way.
Technique scheme at least has following beneficial effect: the present invention adopts and directly samples the bypass filter capacitor voltage of high pressure major loop, detect, not only simply, practical, convenient, and can Optimization Design of Electronic Circuits greatly, reduce circuit design cost; Optical sensor and pressure transducer is utilized to detect the size of load and the weight of load, and utilize the shunt capacitance voltage against load material of high pressure major loop to detect, realize three re-detections, substantially increase the reliability of load detecting, stability make the energy loss of load detecting close to zero, improve the competitive power of product.
Accompanying drawing explanation
Fig. 1 is the theory diagram of commercial induction cooker Weight detector of the present invention.
Fig. 2 is the circuit theory diagrams of commercial induction cooker Weight detector of the present invention.
Fig. 3 is the oscillogram of IGBT drive singal in commercial induction cooker Weight detector of the present invention.
Fig. 4 is operating voltage signal Vc1 and the comparison diagram setting reference voltage △ V in commercial induction cooker Weight detector of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below in conjunction with accompanying drawing, the present invention is described further.
Embodiment one
The present invention is to provide a kind of commercial induction cooker Weight detector, load detecting is carried out by the sampling electric current of power frequency side or the electric current of high frequency side for solving household electromagnetic cooker traditional at present and commercial induction cooker load detecting, must at high-pressure side series current mutual inductor, utilize the secondary output of current transformer to detect, cause the complicated loaded down with trivial details problem of circuit structure.
As shown in Figure 1 and Figure 2, the commercial induction cooker Weight detector of the embodiment of the present invention comprises high pressure major loop 1, IGBT module 2, IGBT drive module 3, sampling filtration module 4, MCU processor 5 and electromagnetic induction coil 6, described high pressure major loop 1 current input terminal is electrically connected with city, the signal output part of MCU processor 5 connects the signal input part of IGBT drive module 3, the signal output part of IGBT drive module 3 connects IGBT module 2, and IGBT module 2 connects the signal input part of high pressure major loop 1; The signal input part of MCU processor 5 connects high pressure major loop 1 by sampling filtration module 4; High pressure major loop 1 connects electromagnetic induction coil 6.Wherein, high pressure major loop 1 comprises rectifier circuit 11, differential mode choke coil L1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electromagnetic induction coil, wherein, pin 2 and the pin 3 of rectifier circuit 11 are electrically connected with city, the A end of differential mode choke coil L1 is connected with the pin 1 of rectifier circuit 11, and the B end of differential mode choke coil L1 connects electric capacity C4; The two ends of the other end connection single-phase rectifier bridge module pin 4, electric capacity C3 of electric capacity C4 connect pin 1 and the pin 4 of rectifier circuit 11 respectively; One end of electric capacity C2 is held with the B of differential mode choke coil L1 and is connected, and the other end of electric capacity C2 connects electric capacity C5, and the other end of electric capacity C5 connects the pin 4 of rectifier circuit 11; One end of electric capacity C1 connects the B end of differential mode choke coil L1 and the first signal output part of IGBT module 2 respectively, the other end of electric capacity C1 connects electric capacity C6, the other end of electric capacity C6 connects the pin 4 of rectifier circuit 11 and the secondary signal output terminal of IGBT module 2 respectively, electric capacity C2 is connected one end of electromagnetic induction coil 6 with the link of electric capacity C5, and electric capacity C1 and the link of electric capacity C6 are connected the other end of electromagnetic induction coil 6 and the 3rd signal output part of IGBT module 2 respectively; The B end of differential mode choke coil L1 connects the signal input part of sampling filtration module 4.
In the present embodiment, also comprise for detecting above electromagnetic induction coil 6 whether loaded optical sensor 7 and the pressure transducer 8 for detecting load weight, optical sensor 7 is connected with MCU processor 5, and pressure transducer 8 is connected with MCU processor 5 by signal amplification circuit filter 10.Particularly, in concrete enforcement, optical sensor 7 is arranged on the electromagnetic induction coil 6 of electromagnetic stove, and the installation site of optical sensor 7 is positioned at 2/3 place of electromagnetic induction coil 6 radius, is conducive to the light intensity above optical sensor 7 perception electromagnetic induction coil 6 like this; Pressure transducer 8 is arranged on below the thermostable transparent glass-ceramic panel of electromagnetic stove, and in time having load to be pressed on thermostable transparent crystallite, the weight of pressure transducer 8 pairs of loads detects, to judge whether to put the suitable load of weight.At work, whether suitable the signal of the intermittent inquiry optical sensor 7 of MCU processor 5, judge whether that load covers the size of optical sensor 7 and load, if do not detect and electromagnetic stove be placed with the off size suitable of load or load, then continue the signal of detecting optical sensor 7, when there being the object of suitable size to cover optical sensor 7, the AD sampling input of starting pressure sensor 8 while of MCU processor 5, MCU processor 5 compares with the referential weight scope Vp of setting is capable the load weight gathered, if the weight information of load is not in referential weight scope Vp, then do not start heating, if the weight information of load is in referential weight scope Vp, then continue to judge the whether suitable heating of the material of load, MCU processor 5 sends a pot inspection pulse signal every the schedule time to IGBT drive module 3, IGBT drive module 3 drives IGBT module 2 to work, the operating voltage signal that sampling filtration module 4 obtains high pressure major loop 1 directly flows to MCU processor 5, MCU processor 5 compares the reference voltage of the operating voltage signal of conveying with setting, if operating voltage signal Vc1 is greater than reference voltage △ V, now the non-loaded or inappropriate judgement of load made by MCU processor 5, then do not start heating, if operating voltage signal Vc1 is less than reference voltage △ V, now MCU processor 5 make load and load be applicable to judgement, and then start heating schedule, directly load is heated.Therefore, the present embodiment utilizes the size of optical sensor 7 and pressure transducer 8 pairs of loads and the weight of load to detect, and utilize the shunt capacitance voltage against load material of high pressure major loop 1 to detect, realize three re-detections, substantially increase the reliability of load detecting, stability make the energy loss of load detecting close to zero, improve the competitive power of product.
Embodiment two
The commercial induction cooker load detection method of the embodiment of the present invention comprises the following steps:
Step 1, optical sensor 7 detects the load information above electromagnetic induction coil 6 every the schedule time and is transferred to MCU processor 5;
Step 2, MCU processor 5 judges whether that load covers the top of electromagnetic induction coil 6, if any load, then enters next step, if do not have load, repeats step 1;
Step 3, pressure transducer 8 detects the weight information of load and is transferred to MCU processor 5;
Step 4, the weight of MCU processor 5 pairs of loads and the referential weight scope Vp of setting compare, if the weight of load is not in referential weight scope Vp, then enter step 8, if the weight information of load is in referential weight scope Vp, then enter next step;
Step 5, high pressure major loop 1 normally works, and MCU processor 5 sends a pot inspection pulse signal every the schedule time to IGBT drive module 3, and IGBT drive module 3 drives IGBT module 2 to work;
Step 6, the operating voltage signal that sampling filtration module 4 obtains high pressure major loop 1 directly flows to MCU processor 5;
Step 7, MCU processor 5 compares the reference voltage of the operating voltage signal of conveying with setting, if operating voltage signal Vc1 is greater than reference voltage △ V, now non-loaded the or inappropriate judgement of load made by MCU processor 5, then enter step 8; If operating voltage signal Vc1 is less than reference voltage △ V, now MCU processor 5 make load and load be applicable to judgement, and then start heating schedule, directly load is heated;
Step 8, does not start heating.
Commercial induction cooker major loop is half-bridge loop, during work, optical sensor 7 carries signal to MCU processor 5 according to the power change of light, according to the detection data of optical sensor 7, MCU processor 5 judges whether that load covers the top of electromagnetic induction coil 6, and judge that whether the size of this load is suitable, pressure transducer 8 gathers the pressure signal on the thermostable transparent glass-ceramic panel of electromagnetic stove, the pressure signal collected is carried out amplification with filtering process by signal amplification circuit filter 10 by pressure transducer 8, treated signal flows to the AD sampling input port of MCU processor 5, the referential weight scope Vp of MCU processor 5 inner setting, if the weight of load is not in referential weight scope Vp, the weight of such as load is less than the minimum value of referential weight scope Vp, illustrate that load weight is too light, for other are not suitable for the object of heating, if the weight of load is greater than the maximal value of referential weight scope Vp, illustrate that load weight is too heavy, exceed the load-bearing category of this equipment, MCU processor 5 starts alarm 9 and reports to the police, and do not start heating, or prompting of breaking down, when the weight information of load is in referential weight scope Vp, then continue to judge whether this load material is the suitable pan utensil heated, MCU processor 5 exports the complementary IGBT drive singal with dead band of two-way to IGBT drive module 3, IGBT drive module 3 drives IGBT module 2 to work, the waveform of this IGBT drive singal as shown in Figure 3, for several pulses of upper and lower bridge arm of sequential complementation, duration of pulse is T.The AD input port that operating voltage signal Vc1 on high-voltage filtering capacitor C4 directly flows to MCU processor 5 after sampling filtration module 4 processes carries out calculating and processing.If now do not have load or load very light, the AD sampled signal values flowing to MCU processor 5 is larger, as shown in Figure 4, compare with setting value △ V, if operating voltage signal Vc1 is greater than reference voltage △ V, now MCU processor 5 just can make the non-loaded or inappropriate judgement of load, does not start heating; If operating voltage signal Vc2 is less than reference voltage △ V, as shown in Figure 3, now MCU processor 5 make load and load be applicable to judgement, and then start heating schedule, directly load is heated.
The present invention adopts and directly samples the bypass filter capacitor voltage of high pressure major loop 1, detect, not only simply, practical, convenient, and can Optimization Design of Electronic Circuits greatly, reduce circuit design cost; The size of optical sensor 7 and pressure transducer 8 pairs of loads and the weight of load is utilized to detect, and utilize the shunt capacitance voltage against load material of high pressure major loop 1 to detect, realize three re-detections, substantially increase the reliability of load detecting, stability make the energy loss of load detecting close to zero, improve the competitive power of product.
The above is the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (7)
1. a commercial induction cooker Weight detector, it is characterized in that, comprise high pressure major loop, IGBT module, IGBT drive module, sampling filtration module, MCU processor and electromagnetic induction coil, described high pressure main circuit current input end is electrically connected with city, the signal output part of MCU processor connects the signal input part of IGBT drive module, the signal output part of IGBT drive module connects IGBT module, and IGBT module connects the signal input part of high pressure major loop; The signal input part of MCU processor connects high pressure major loop by sampling filtration module; High pressure major loop connects electromagnetic induction coil.
2. commercial induction cooker Weight detector as claimed in claim 1, is characterized in that, also comprise for detecting above electromagnetic induction coil whether loaded optical sensor, described optical sensor is connected with MCU processor.
3. commercial induction cooker Weight detector as claimed in claim 1, it is characterized in that, also comprise the pressure transducer for detecting load weight, described pressure transducer is connected with MCU processor by signal amplification circuit filter.
4. commercial induction cooker Weight detector as claimed in claim 1, is characterized in that, also comprise the alarm be connected with MCU processor.
5. commercial induction cooker Weight detector as claimed in claim 1, it is characterized in that, described high pressure major loop comprises rectifier circuit, differential mode choke coil L1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electromagnetic induction coil, wherein, pin 2 and the pin 3 of rectifier circuit are electrically connected with city, the A end of differential mode choke coil L1 is connected with the pin 1 of rectifier circuit, and the B end of differential mode choke coil L1 connects electric capacity C4; The two ends of the other end connection single-phase rectifier bridge module pin 4, electric capacity C3 of electric capacity C4 connect pin 1 and the pin 4 of rectifier circuit respectively; One end of electric capacity C2 is held with the B of differential mode choke coil L1 and is connected, and the other end of electric capacity C2 connects electric capacity C5, and the other end of electric capacity C5 connects the pin 4 of rectifier circuit; One end of electric capacity C1 connects the B end of differential mode choke coil L1 and the first signal output part of IGBT module respectively, the other end of electric capacity C1 connects electric capacity C6, the other end of electric capacity C6 connects the pin 4 of rectifier circuit and the secondary signal output terminal of IGBT module respectively, electric capacity C2 is connected one end of electromagnetic induction coil with the link of electric capacity C5, and electric capacity C1 and the link of electric capacity C6 are connected the other end of electromagnetic induction coil and the 3rd signal output part of IGBT module respectively; The B end of differential mode choke coil L1 connects the signal input part of sampling filtration module.
6. a commercial induction cooker load detection method, is characterized in that, the method comprises the following steps:
Step 1, optical sensor detects the load information above electromagnetic induction coil every the schedule time and is transferred to MCU processor;
Step 2, MCU processor judges whether that load covers the top of electromagnetic induction coil, if any load, then enters next step, if do not have load, repeats step 1;
Step 3, pressure transducer detects the weight information of load and is transferred to MCU processor;
Step 4, MCU processor compares with the referential weight scope Vp of setting is capable the weight of load, if the weight of load is not in referential weight scope Vp, then enters step 8, if the weight information of load is in referential weight scope Vp, then enters next step;
Step 5, high pressure major loop normally works, and MCU processor sends a pot inspection pulse signal every the schedule time to IGBT drive module, and IGBT drive module drives IGBT module work;
Step 6, the operating voltage signal that sampling filtration module obtains high pressure major loop directly flows to MCU processor;
Step 7, MCU processor compares the reference voltage of the operating voltage signal of conveying with setting, if operating voltage signal Vc1 is greater than reference voltage △ V, now non-loaded the or inappropriate judgement of load made by MCU processor, then enter step 8; If operating voltage signal Vc1 is less than reference voltage △ V, now MCU processor make load and load be applicable to judgement, and then start heating schedule, directly load is heated;
Step 8, starts alarm equipment alarm, and does not start heating.
7. the non-isolated pan detection method of commercial induction cooker as claimed in claim 6, is characterized in that, the pot inspection pulse signal that described MCU processor exports is the complementary IGBT drive singal with dead band of two-way.
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| CN201410244319.9A CN105203862A (en) | 2014-06-04 | 2014-06-04 | Load detection device and method of commercial induction cooker |
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| CN201410244319.9A CN105203862A (en) | 2014-06-04 | 2014-06-04 | Load detection device and method of commercial induction cooker |
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Cited By (3)
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| CN105158588A (en) * | 2014-06-04 | 2015-12-16 | 广东鼎燊科技有限公司 | Non-isolated type cooker detection apparatus and method for commercial induction cooker |
| CN106287865A (en) * | 2016-07-29 | 2017-01-04 | 刘万斌 | A kind of commercial induction cooker Weight detector and method |
| CN108361767A (en) * | 2018-02-27 | 2018-08-03 | 青岛芯源通电子有限公司 | A kind of four-head touch crystallite stove for saving electric energy |
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| CN106287865A (en) * | 2016-07-29 | 2017-01-04 | 刘万斌 | A kind of commercial induction cooker Weight detector and method |
| CN106287865B (en) * | 2016-07-29 | 2018-08-03 | 刘万斌 | A kind of commercial induction cooker Weight detector and method |
| CN108361767A (en) * | 2018-02-27 | 2018-08-03 | 青岛芯源通电子有限公司 | A kind of four-head touch crystallite stove for saving electric energy |
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Application publication date: 20151230 |