CN203136220U - Electromagnetic heating device - Google Patents
Electromagnetic heating device Download PDFInfo
- Publication number
- CN203136220U CN203136220U CN 201320081030 CN201320081030U CN203136220U CN 203136220 U CN203136220 U CN 203136220U CN 201320081030 CN201320081030 CN 201320081030 CN 201320081030 U CN201320081030 U CN 201320081030U CN 203136220 U CN203136220 U CN 203136220U
- Authority
- CN
- China
- Prior art keywords
- module
- resistance
- links
- detecting unit
- comparator
- 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.)
- Expired - Fee Related
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 230000001360 synchronised effect Effects 0.000 claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000005070 sampling Methods 0.000 claims abstract description 65
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 31
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 210000003733 optic disk Anatomy 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
Images
Landscapes
- Control Of Resistance Heating (AREA)
Abstract
The utility model discloses an electromagnetic heating device. The electromagnetic heating device includes a resonance heating module including a resonance coil and a resonance capacitor connected with each other in parallel; a switch module connected with the resonance heating module; a sampling module connected with the switch module and used for sampling current of the switch module for producing voltage signals; a synchronous detection module connected with the sampling module used for detecting the voltage signals produced by the sampling module synchronously for producing detection signals when the switch module is switched on and when the switch module is switched off; a synchronous feedback module connected across two ends of the resonance heating module and used for producing feedback signals according to voltage across the two ends of the resonance heating module; and a control module connected with the synchronous feedback module, the synchronous detection module and the switch module respectively and used for adjusting control signals output to the switch module according to the feedback signals for realizing the control of the switch module when that the abnormity of the detection signals is detected. The electromagnetic heating device provided by the utility model can realize zero-voltage switching-on through adjusting on-off states in real time, so that switching-on loss is reduced, switch heat production is reduced and the service lifetime is prolonged.
Description
Technical field
The utility model relates to the living electric apparatus technical field, particularly a kind of electromagnetic heater.
Background technology
At present, the heating of electromagnetic oven control scheme is generally used single tube heating control scheme.In single tube heating control scheme, IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) synchronizing characteristics is subjected to pan material, coil panel inductance value, coil panel to the influence of factors such as pan distance, and IGBT can't realize that no-voltage is open-minded.And IGBT is leading or the very high switching loss of opening electric current and Geng Gao of meeting generation is opened in hysteresis, makes the IGBT heating increase, thereby causes performance decline, the increasing of damage risk.
The utility model content
The purpose of this utility model is intended to solve the problems of the technologies described above at least.
For this reason, the purpose of this utility model is to propose a kind of electromagnetic heater, it is open-minded to realize no-voltage that this electromagnetic heater can be adjusted the on off state of power switch in real time, reduce the turn-on consumption of switch, reduce the switch heating, improve the useful life of switch, and this installation cost is low, reliability is high.
For achieving the above object, the electromagnetic heater that the utility model proposes comprises: the resonance heating module, and described resonance heating module comprises resonance coil parallel with one another and resonant capacitance; Switch module, described switch module links to each other with described resonance heating module; Sampling module, described sampling module links to each other with described switch module, and described sampling module is sampled the electric current of described switch module with the formation voltage signal; Synchronous detection module, described synchronous detection module links to each other with described sampling module, and described synchronous detection module detects the voltage signal of described sampling module generation synchronously to generate detection signal when described switch module turns on and off; The synchronous feedback module, described synchronous feedback module is connected the two ends of described resonance heating module, and described synchronous feedback module generates feedback signal according to the voltage at described resonance heating module two ends; Control module, described control module links to each other with described synchronous feedback module, described synchronous detection module and described switch module respectively, and described control module is exported to the control signal of described switch module to realize the control to described switch module according to described feedback signal adjustment when described detection signal is unusual.
According to electromagnetic heater of the present utility model, the current signal that can be in the course of the work flows through switch module by detection is judged the operating state of switch module, adjust the time of opening with turn-offing of switch module simultaneously in real time according to this operating state, so that switch module continues to realize that no-voltage is open-minded, thereby reduce the turn-on consumption of switch, reduce the switch caloric value, improve the useful life of switch.In addition, this installation cost is low, reliability is high.
In the utility model, described synchronous detection module comprises first detecting unit and second detecting unit, the voltage signal output high-low level signal that described first detecting unit and second detecting unit generate according to described sampling module.
Wherein, described first detecting unit further comprises: first resistance, and an end of described first resistance links to each other with first reference power source; Second resistance, an end of described second resistance links to each other with the other end of described first resistance, and the other end ground connection of described second resistance has first node between described second resistance and described first resistance; First comparator, one in the output of the negative input end of described first comparator and described first node and described sampling module links to each other, in the output of the positive input terminal of described first comparator and described first node and described sampling module another links to each other, and the output of described first comparator links to each other with described control module.
And described second detecting unit further comprises: the 3rd resistance, and an end of described the 3rd resistance links to each other with second reference power source; The 4th resistance, an end of described the 4th resistance links to each other with the other end of described the 3rd resistance, and the other end ground connection of described the 4th resistance has Section Point between described the 4th resistance and described the 3rd resistance; Second comparator, one in the output of the positive input terminal of described second comparator and described Section Point and described sampling module links to each other, in the output of the negative input end of described second comparator and described Section Point and described sampling module another links to each other, and the output of described second comparator links to each other with described control module.
In addition, described electromagnetic heater also comprises the 5th resistance and first electric capacity, one end of described the 5th resistance links to each other with an end of first electric capacity, described first detecting unit and described second detecting unit respectively, the other end of described the 5th resistance links to each other with described sampling module, the other end ground connection of described first electric capacity.
In the utility model, described sampling module is the parallel circuits of the 6th resistance or current transformer and the formation of the 7th resistance.
Further, described sampling module is the 6th resistance, and described switch module is IGBT, and an end of described the 6th resistance links to each other with the emitter of described IGBT, and the other end of described the 6th resistance links to each other with the negative pole end of input power supply.
Further, described switch module is IGBT, described sampling module is the parallel circuits that current transformer and the 7th resistance form, one end of the primary coil of described current transformer links to each other with the emitter of described IGBT, the other end of the primary coil of described current transformer links to each other with the negative pole end of input power supply, the secondary coil of described current transformer is in parallel with described the 7th resistance, one end of the secondary coil of described current transformer links to each other with described synchronous detection module respectively with an end of described the 7th resistance, and the other end of the other end of the secondary coil of described current transformer and described the 7th resistance is ground connection respectively.
Further, described switch module is IGBT, described sampling module is the parallel circuits that current transformer and the 7th resistance form, one end of the primary coil of described current transformer links to each other with an end of described resonance heating module, the other end of the primary coil of described current transformer links to each other with the collector electrode of described IGBT, the secondary coil of described current transformer is in parallel with described the 7th resistance, one end of the secondary coil of described current transformer links to each other with described synchronous detection module respectively with an end of described the 7th resistance, and the other end of the other end of the secondary coil of described current transformer and described the 7th resistance is ground connection respectively.
Further, described electromagnetic heater also comprises: driver module, described driver module is connected between described control module and the described switch module, and described driver module generates opening or turn-offing of the driving described switch module of signal controlling according to the control signal of described control module output.
The aspect that the utility model is additional and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Description of drawings
Above-mentioned and/or the additional aspect of the utility model and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the block diagram of the electromagnetic heater of an embodiment of the utility model;
Fig. 2 is the circuit diagram of a kind of execution mode of electromagnetic heater of the present utility model;
Fig. 3 is the circuit diagram of a kind of execution mode of electromagnetic heater of the present utility model;
Fig. 4 is the circuit diagram of a kind of execution mode of electromagnetic heater of the present utility model;
Fig. 5 is the circuit diagram of a kind of execution mode of synchronous detection module;
Fig. 6 is the circuit diagram of a kind of execution mode of synchronous detection module;
Fig. 7 is the circuit diagram of a kind of execution mode of synchronous detection module;
Corresponding waveform sequential chart when Fig. 8 (a) opens synchronously for IGBT;
Corresponding waveform sequential chart when Fig. 8 (b) opens in advance for IGBT;
Corresponding waveform sequential chart when Fig. 8 (c) opens for IGBT lags behind; And
Fig. 9 is the flow chart of control method of the electromagnetic heater of an embodiment of the utility model.
Reference numeral:
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein identical or similar label is represented identical or similar elements or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Disclosing hereinafter provides many different embodiment or example to be used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter parts and the setting to specific examples is described.Certainly, they only are example, and purpose does not lie in restriction the utility model.In addition, the utility model can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and purpose clearly, itself not indicate the relation between the various embodiment that discuss of institute and/or the setting.In addition, various specific technology and examples of material that the utility model provides, but those of ordinary skills can recognize the property of can be applicable to of other technologies and/or the use of other materials.In addition, first feature described below second feature it " on " structure can comprise that first and second features form the embodiment of direct contact, can comprise that also additional features is formed on the embodiment between first and second features, such first and second features may not be direct contacts.
In description of the present utility model, need to prove, unless otherwise prescribed and limit, term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly to link to each other, and also can link to each other indirectly by intermediary, for the ordinary skill in the art, can understand the concrete implication of above-mentioned term as the case may be.
With reference to following description and accompanying drawing, with these and other aspects of clear embodiment of the present utility model.In these descriptions and accompanying drawing, some specific implementations among the embodiment of the present utility model are specifically disclosed, represent to implement some modes of the principle of embodiment of the present utility model, but should be appreciated that the scope of embodiment of the present utility model is not limited.On the contrary, embodiment of the present utility model comprises spirit and interior all changes, modification and the equivalent of intension scope that falls into institute's additional claims.
Electromagnetic heater and the control method thereof that the utility model embodiment is proposed is described with reference to the accompanying drawings.
Fig. 1 shows the block diagram of the electromagnetic heater that proposes according to the utility model first aspect embodiment.As shown in Figure 1, the electromagnetic heater that the utility model proposes comprises resonance heating module 110, switch module 120, sampling module 130, synchronous detection module 140, synchronous feedback module 150 and control module 160.
Wherein, resonance heating module 110 comprises resonance coil L parallel with one another and resonance capacitor C.
In an embodiment of the present utility model, sampling module 130 is the parallel circuits of the 6th resistance R 6 or current transformer 131 and 7 formation of the 7th resistance R.
In an example of the present utility model, as shown in Figure 2, switch module 120 is IGBT, sampling module 130 is the parallel circuits that current transformer 131 and the 7th resistance R 7 form, one end of the primary coil of current transformer 131 links to each other with the emitter of IGBT, the other end of the primary coil of current transformer 131 links to each other with the negative pole end of input power supply, the secondary coil of current transformer 131 is in parallel with the 7th resistance R 7, one end of one end of the secondary coil of current transformer 131 and the 7th resistance R 7 links to each other with synchronous detection module 140 respectively, and the other end of the other end of the secondary coil of current transformer 131 and the 7th resistance R 7 is ground connection respectively.Particularly, current transformer 131 is connected in series to the emitter of IGBT, current transformer 131 exports secondary coil by the size of detection of primary coil current to according to preset ratio, and secondary current flows through the 7th resistance R 7 and produces voltage with the formation voltage signal in the 7th resistance R 7.
In another example of the present utility model, as shown in Figure 3, switch module 120 is IGBT, sampling module 130 is the parallel circuits that current transformer 131 and the 7th resistance R 7 form, one end of the primary coil of current transformer 131 links to each other with an end of resonance heating module 110, the other end of the primary coil of current transformer 131 links to each other with the collector electrode of IGBT, the secondary coil of current transformer 131 is in parallel with the 7th resistance R 7, one end of one end of the secondary coil of current transformer 131 and the 7th resistance R 7 links to each other with synchronous detection module 140 respectively, and the other end of the other end of the secondary coil of current transformer 131 and the 7th resistance R 7 is ground connection respectively.Particularly, current transformer 131 is connected in series to the collector electrode of IGBT, current transformer 131 exports secondary coil by the size of detection of primary coil current to according to preset ratio, and secondary current flows through the 7th resistance R 7 and produces voltage with the formation voltage signal in the 7th resistance R 7.
In another example of the present utility model, as shown in Figure 4, sampling module 130 is the 6th resistance R 6, and switch module 120 is IGBT, and an end of the 6th resistance R 6 links to each other with the emitter of IGBT, and the other end of the 6th resistance R 6 links to each other with the negative pole end of input power supply.Particularly, when IGBT was in opening state, the electric current that flows through the 6th resistance R 6 produced voltage with the formation voltage signal in the 6th resistance R 6.
Further, this electromagnetic heater also comprises driver module 170.As shown in Figure 4, driver module 170 is connected between control module 160 and the switch module 120, and driver module 170 generates opening or turn-offing of driving Signal-controlled switch module 120 according to the control signal of control module 160 outputs.
In addition, this electromagnetic heater also comprises rectification filtering module 180.As shown in Figure 4, rectification filtering module 180 links to each other with resonance heating module 110, and rectification filtering module 180 is converted to direct current with the alternating current of input.
In an embodiment of the present utility model, as shown in Figure 4, synchronous detection module 140 comprises the voltage signal output high-low level signal that first detecting unit 141 and second detecting unit, 142, the first detecting units 141 and second detecting unit 142 generate according to sampling module 130.
Wherein, in an embodiment of the present utility model, first detecting unit 141 further comprises: first resistance R 1, second resistance R 2 and the first comparator U1.Wherein, one end of first resistance R 1 links to each other with first reference power source, one end of second resistance R 2 links to each other with the other end of first resistance R 1, the other end ground connection of second resistance R 2, has first node A between second resistance R 2 and first resistance R 1, one among the output D of the negative input end of the first comparator U1 and first node A and sampling module 130 links to each other, among the output D of the positive input terminal of the first comparator U1 and first node A and sampling module 130 another links to each other, and the output of the first comparator U1 links to each other with control module 160.Wherein, in an example of the present utility model, first reference power source can be+5V.
And in an embodiment of the present utility model, second detecting unit 142 further comprises: the 3rd resistance R 3, the 4th resistance R 4 and the second comparator U2.Wherein, one end of the 3rd resistance R 3 links to each other with second reference power source, one end of the 4th resistance R 4 links to each other with the other end of the 3rd resistance R 3, the other end ground connection of the 4th resistance R 4, has Section Point B between the 4th resistance R 4 and the 3rd resistance R 3, one among the output D of the positive input terminal of the second comparator U2 and Section Point B and sampling module 130 links to each other, among the output D of the negative input end of the second comparator U2 and Section Point B and sampling module 130 another links to each other, and the output of the second comparator U2 links to each other with control module 160.Wherein, in an example of the present utility model, second reference power source can be-5V.
Be understandable that, synchronous detection module 140 can have multiple way of realization, can be for as Fig. 4 any to the way of realization shown in Figure 7, at first the way of realization of synchronous detection module shown in Figure 4 140 is described below, with reference to Fig. 5 to Fig. 7 other ways of realization of synchronous detection module 140 is described then.
As shown in Figure 4, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, and wherein, first detecting unit 141 further comprises: first resistance R 1, second resistance R 2 and the first comparator U1.Wherein, one end of first resistance R 1 links to each other with first reference power source, one end of second resistance R 2 links to each other with the other end of first resistance R 1, the other end ground connection of second resistance R 2, has first node A between second resistance R 2 and first resistance R 1, the negative input end of the first comparator U1 links to each other with first node A, and the positive input terminal of the first comparator U1 links to each other with the output D of sampling module 130, and the output of the first comparator U1 links to each other with control module 160.And second detecting unit 142 further comprises: the 3rd resistance R 3, the 4th resistance R 4 and the second comparator U2.Wherein, one end of the 3rd resistance R 3 links to each other with second reference power source, one end of the 4th resistance R 4 links to each other with the other end of the 3rd resistance R 3, the other end ground connection of the 4th resistance R 4, has Section Point B between the 4th resistance R 4 and the 3rd resistance R 3, the positive input terminal of the second comparator U2 links to each other with Section Point B, and the output D of the negative input end sampling module 130 of the second comparator U2 links to each other, and the output of the second comparator U2 links to each other with control module 160.In this example, first reference power source can be+5V, and second reference power source can be-5V.
In this example, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, in a switch periods, wherein, when high level signal of first detecting unit 141 output and second detecting unit 142 continued the output low level signal, control module 160 judged that switch modules 120 are that no-voltage is open-minded synchronously; When two high level signals of first detecting unit 141 output and second detecting unit 142 continued the output low level signal, control module 160 judged that switch modules 120 are for open-minded in advance; When first detecting unit high level signal of 141 outputs and high level signal of second detecting unit, 142 outputs, control module 160 judges that switch module 120 is open-minded for lagging behind.
In an embodiment of the present utility model, when opening in advance, it is open-minded that control module 160 is adjusted 120 time-delays of control signal control switch modules at switch module 120; When switch module 120 was opened for lagging behind, it is open-minded in advance that control module 160 is adjusted control signal control switch module 120.Thus, adjust the operating state of switch module 120 in the course of the work in real time by control module 160, realize that no-voltage is open-minded, reduce turn-on consumption, improve the useful life of switch module 120.
Being example with execution mode shown in Figure 4 below is described the course of work of the electromagnetic heater that the utility model proposes.
In this example, switch module 120 is IGBT, sampling module 130 is the 6th resistance R 6, synchronous feedback module 150 comprises first to fourth divider resistance and the 3rd comparator, be respectively R8, R9, R10, R11 and U3, control module 160 is MCU, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, wherein, first detecting unit 141 further comprises first resistance R 1, second resistance R 2 and the first comparator U1, and second detecting unit 142 further comprises the 3rd resistance R 3, the 4th resistance R 4 and the second comparator U2.
In this example, this electromagnetic heater also comprises the 5th resistance R 5 and first capacitor C 1.Wherein, an end of the 5th resistance R 5 links to each other with an end, first detecting unit 141 and second detecting unit 142 of first capacitor C 1 respectively, and the other end of the 5th resistance R 5 links to each other with sampling module 130, the other end ground connection of first capacitor C 1.Particularly, the 5th resistance R 5 and first capacitor C 1 are formed low-pass filter circuit, and the voltage signal that sampling module 130 is provided when switch module 120 is opened carries out filtering.
Particularly, in the electromagnetic heater course of work, when IGBT opens, electric current flows through resonance coil L successively, IGBT, the 6th resistance R 6, ground wire, the electric current that flows through the 6th resistance R 6 produces voltage U R6 in the 6th resistance R 6, UR6 passes through R5, the input first comparator U1 after the C1 filtering, the second comparator U2 and comparator another port voltage separately compares, and comparative result imported MCU, when closing, IGBT has no progeny, the current direction resonant capacitance C of resonance coil L, resonant capacitance C voltage rises, when resonance coil L electric current drops to zero, resonant capacitance C voltage rises to the highest, this moment, resonant capacitance C began discharge, resonant capacitance C voltage begins to descend, the 3rd comparator U3 is by the first divider resistance R8, the second divider resistance R9, the 3rd divider resistance R10 to the four divider resistance R11 detect resonant capacitance C both end voltage, the 3rd comparator U3 output low level when the 3rd comparator U3 positive input voltage is lower than negative input voltage, and feeding back to MCU, MCU adjusts control signal when detecting low level decline open-minded by driver module 170 control IGBT.Open moment at IGBT and as shown in Figure 8 three kinds of operating states may occur, the first comparator U1, the second comparator U2 export different signals under three kinds of operating states.Fig. 8 shows waveform corresponding under three kinds of operating states that IGBT opens moment, wherein, and I
IGBTBe the IGBT electric current, Ton is service time.
Wherein, during electromagnetic heater work, IGBT periodically turns on and off.Shown in Fig. 8 (a), when IGBT opened synchronously, collector voltage to 0 was open-minded immediately, and the IGBT electric current is risen by zero beginning near linear, reaches peak value at the shutoff initial current, turn-offs after-current and drops to 0 gradually.These process the 6th resistance R 6 sample streams are crossed the electric current of IGBT, at IGBT electric current uphill process initial stage UR6＜UA, wherein UA is the voltage of the first node A that links to each other with the negative input end of the first comparator U1, the first comparator U1 output low level, when the IGBT electric current rises to when higher, UR6〉UA, the first comparator U1 exports high level, and in IGBT opens overall process with the one-period that turn-offs, the electric current of IGBT all flows to ground wire, UR6 is always positive voltage, so the second comparator U2 continues the output low level signal.Therefore, IGBT is high level of first comparator U1 output in a switch periods of opening synchronously, the second comparator U2 continues the output low level signal, namely say, when IGBT opens synchronously, high level signal of first detecting unit, 141 outputs, second detecting unit 142 continues the output low level signal.
Shown in Fig. 8 (b), when IGBT opens in advance, open moment collector voltage not to be 0, IGBT electric current produce higher forward spike opening moment, this moment UR6 UA, the first comparator U1 exports high level.Peak current rises from the reduced-current approximately linear after beginning to descend again, in this process, UR6＜UA after voltage descends, the first comparator U1 output low level, when the IGBT electric current rises to when higher UR6〉UA, the first comparator U1 exports high level, turn-off the IGBT electric current up to IGBT and drop to 0, the first comparator U1 output low level fast.In the whole process of a switch periods of IGBT, the IGBT electric current has two forward spikes, and the first comparator U1 exports two high level, and IGBT does not have negative current in the whole process, and the second comparator U2 continues the output low level signal.Therefore, IGBT is when opening in advance, two high level of first comparator U1 output in a switch periods, the second comparator U2 continues the output low level signal, namely say, when IGBT opens in advance, two high level signals of first detecting unit, 141 outputs, second detecting unit 142 continues the output low level signal.
Shown in Fig. 8 (c), IGBT lags behind when opening, open moment because the concussion loop current that L2 and C2 form is reverse at IGBT, flow to IGBT by ground, the IGBT electric current is negative current, UR6＜0, UR6＜UB when negative current is big, wherein UB is the voltage of the Section Point B that links to each other with the positive input terminal of the second comparator U2, the second comparator U2 exports high level, negative current drops to 0 after IGBT opens, and the beginning forward rises, when the IGBT electric current is low in uphill process, and UR6＜UA, UR6〉UB, the first comparator U1 output low level, the second comparator U2 output low level is when the IGBT electric current rises to UR6 when higher〉UA, UR6〉UB, the first comparator U1 exports high level.Therefore, IGBT lags behind when opening, high level of first comparator U1 output in a switch periods, the second comparator U2 exports a high level, namely say, when the IGBT hysteresis is opened, high level signal of first detecting unit, 141 outputs, high level signal of second detecting unit, 142 outputs.
Export a high level when MCU detects the first comparator U1 in a switch periods, the second comparator U2 continues the output low level signal, and it is open-minded synchronously that MCU is judged as the IGBT no-voltage, and opening state does not need to adjust;
When MCU detects two high level of first comparator U1 output in a switch periods, the second comparator U2 continues the output low level signal, it is open-minded in advance that MCU is judged as IGBT, when in next switch periods, detecting the 3rd comparator U3 output low level trailing edge, IGBT is opened in time-delay, the next cycle continues to detect two high level of first comparator U1 output, then continue to increase to open delay time, in a switch periods, detect high level of first comparator U1 output up to MCU, the second comparator U2 continues the output low level signal, till the IGBT no-voltage is opened.
When MCU high level of first comparator U1 output in a switch periods, the second comparator U2 exports a high level, MCU then is judged as IGBT and lags behind open-minded, when in next switch periods, detecting the 3rd comparator U3 output low level trailing edge, reduce and open delay time, open-minded in advance, the next cycle continues to detect high level of first comparator U1 output, during high level of second comparator U2 output, then MCU continues to reduce to open delay time, detect high level of first comparator U1 output up to MCU in a switch periods, the second comparator U2 continues the output low level signal, till the IGBT no-voltage is opened.
Thus, adjust the time that turns on and off of IGBT in real time so that IGBT continues to realize that no-voltage is open-minded according to the operating state of IGBT.
Below with reference to Fig. 5 to Fig. 7 other ways of realization of synchronous detection module 140 are described.
As shown in Figure 5, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, and wherein, first detecting unit 141 further comprises: first resistance R 1, second resistance R 2 and the first comparator U1.Wherein, one end of first resistance R 1 links to each other with first reference power source, one end of second resistance R 2 links to each other with the other end of first resistance R 1, the other end ground connection of second resistance R 2, has first node A between second resistance R 2 and first resistance R 1, the positive input terminal of the first comparator U1 links to each other with first node A, and the negative input end of the first comparator U1 links to each other with the output D of sampling module 130, and the output of the first comparator U1 links to each other with control module 160.And second detecting unit 142 further comprises: the 3rd resistance R 3, the 4th resistance R 4 and the second comparator U2.Wherein, one end of the 3rd resistance R 3 links to each other with second reference power source, one end of the 4th resistance R 4 links to each other with the other end of the 3rd resistance R 3, the other end ground connection of the 4th resistance R 4, has Section Point B between the 4th resistance R 4 and the 3rd resistance R 3, the positive input terminal of the second comparator U2 links to each other with Section Point B, and the output D of the negative input end sampling module 130 of the second comparator U2 links to each other, and the output of the second comparator U2 links to each other with control module 160.Wherein, first reference power source can be+5V, and second reference power source can be-5V.
In this example, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, in a switch periods, wherein, when high level signal of first detecting unit 141 output and second detecting unit 142 continued the output low level signal, control module 160 judged that switch modules 160 are that no-voltage is open-minded synchronously; When two low level signals of first detecting unit 141 output and second detecting unit 142 continued the output low level signal, control module 160 judged that switch modules 120 are for open-minded in advance; When first detecting unit low level signal of 141 outputs and high level signal of second detecting unit, 142 outputs, control module 160 judges that switch module 120 is open-minded for lagging behind.
As shown in Figure 6, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, and wherein, first detecting unit 141 further comprises: first resistance R 1, second resistance R 2 and the first comparator U1.Wherein, one end of first resistance R 1 links to each other with first reference power source, one end of second resistance R 2 links to each other with the other end of first resistance R 1, the other end ground connection of second resistance R 2, has first node A between second resistance R 2 and first resistance R 1, the negative input end of the first comparator U1 links to each other with first node A, and the positive input terminal of the first comparator U1 links to each other with the output D of sampling module 130, and the output of the first comparator U1 links to each other with control module 160.And second detecting unit 142 further comprises: the 3rd resistance R 3, the 4th resistance R 4 and the second comparator U2.Wherein, one end of the 3rd resistance R 3 links to each other with second reference power source, one end of the 4th resistance R 4 links to each other with the other end of the 3rd resistance R 3, the other end ground connection of the 4th resistance R 4, has Section Point B between the 4th resistance R 4 and the 3rd resistance R 3, the negative input end of the second comparator U2 links to each other with Section Point B, and the output D of the positive input terminal sampling module 130 of the second comparator U2 links to each other, and the output of the second comparator U2 links to each other with control module 160.Wherein, first reference power source can be+5V, and second reference power source can be-5V.
In this example, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, in a switch periods, wherein, when high level signal of first detecting unit 141 output and second detecting unit 142 continued the output high level signal, control module 160 judged that switch modules are that no-voltage is open-minded synchronously; When two high level signals of first detecting unit 141 output and second detecting unit 142 continued the output high level signal, control module 160 judged that switch modules 120 are for open-minded in advance; When first detecting unit high level signal of 141 outputs and low level signal of second detecting unit, 142 outputs, control module 160 judges that switch module 120 is open-minded for lagging behind.
As shown in Figure 7, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, and wherein, first detecting unit 141 further comprises: first resistance R 1, second resistance R 2 and the first comparator U1.Wherein, one end of first resistance R 1 links to each other with first reference power source, one end of second resistance R 2 links to each other with the other end of first resistance R 1, the other end ground connection of second resistance R 2, has first node A between second resistance R 2 and first resistance R 1, the positive input terminal of the first comparator U1 links to each other with first node A, and the negative input end of the first comparator U1 links to each other with the output D of sampling module 130, and the output of the first comparator U1 links to each other with control module 160.And second detecting unit 142 further comprises: the 3rd resistance R 3, the 4th resistance R 4 and the second comparator U2.Wherein, one end of the 3rd resistance R 3 links to each other with second reference power source, one end of the 4th resistance R 4 links to each other with the other end of the 3rd resistance R 3, the other end ground connection of the 4th resistance R 4, has Section Point B between the 4th resistance R 4 and the 3rd resistance R 3, the negative input end of the second comparator U2 links to each other with Section Point B, and the output D of the positive input terminal sampling module 130 of the second comparator U2 links to each other, and the output of the second comparator U2 links to each other with control module 160.Wherein, first reference power source can be+5V, and second reference power source can be-5V.
In this example, synchronous detection module 140 comprises first detecting unit 141 and second detecting unit 142, in a switch periods, wherein, when low level signal of first detecting unit 141 output and second detecting unit 142 continued the output high level signal, control module 160 judged that switch modules 120 are that no-voltage is open-minded synchronously; When two low level signals of first detecting unit 141 output and second detecting unit 142 continued the output high level signal, control module 160 judged that switch modules 120 are for open-minded in advance; When first detecting unit low level signal of 141 outputs and low level signal of second detecting unit, 142 outputs, control module 160 judges that switch module 120 is open-minded for lagging behind.
Similarly, can analyze Fig. 5 opens electromagnetic heater under three kinds of operating states of moment at IGBT to other ways of realization of synchronous detection module 140 shown in Figure 7 the course of work, so locate not do to describe.
Electromagnetic heater according to the utility model embodiment, the current signal that can be in the course of the work flows through switch module by detection is judged the operating state of switch module, adjust the time of opening with turn-offing of switch module simultaneously in real time according to this operating state, so that switch module continues to realize that no-voltage is open-minded, thereby reduce the turn-on consumption of switch, reduce the switch caloric value, improve the useful life of switch.In addition, this installation cost is low, reliability is high.
The control method of the electromagnetic heater that proposes below with reference to the utility model second aspect of Fig. 9 embodiment is described.
Fig. 9 shows the flow process of control method of the electromagnetic heater of an embodiment of the utility model, and wherein, electromagnetic heater comprises resonance heating module, switch module, sampling module, synchronous detection module, synchronous feedback module and control module.As shown in Figure 9, the control method of the electromagnetic heater of an embodiment proposition of the utility model comprises the steps:
Step S1, in the one-period that switch module turns on and off, the electric current of sampling module sampling switch module is with the formation voltage signal.
Step S2, the synchronous detectable voltage signals of synchronous detection module is to generate detection signal.
Step S3, the synchronous feedback module generates feedback signal according to the height of the voltage at resonance heating module two ends.
Step S4, control module receives detection signal and feedback signal, and when detection signal is unusual according to feedback signal adjustment export to the control signal of switch module to realize the control to switch module.
In an example of the present utility model, synchronous detection module comprises first detecting unit and second detecting unit, in a switch periods, this control method further comprises: if high level signal of first detecting unit output and second detecting unit continue the output low level signal, control module judges that switch module is that no-voltage is open-minded synchronously; If two high level signals of first detecting unit output and second detecting unit continue the output low level signal, control module judges that switch module is for open-minded in advance; If high level signal of first detecting unit output and high level signal of second detecting unit output, control module judge that switch module is open-minded for lagging behind.
In an embodiment of the present utility model, this control method further comprises: if switch module for open-minded in advance, it is open-minded that control module is adjusted the time-delay of control signal control switch module; If switch module is open-minded for lagging behind, it is open-minded in advance that control module is adjusted control signal control switch module.
Need to prove that the control method of electromagnetic heater of the present utility model is not limited to above-mentioned example, also comprise the control method that following example is given.
In another example of the present utility model, synchronous detection module comprises first detecting unit and second detecting unit, in a switch periods, this control method further comprises: if high level signal of first detecting unit output and second detecting unit continue the output low level signal, control module judges that switch module is that no-voltage is open-minded synchronously; If two low level signals of first detecting unit output and second detecting unit continue the output low level signal, control module judges that switch module is for open-minded in advance; If when low level signal of first detecting unit output and high level signal of second detecting unit output, control module judges that switch module is open-minded for lagging behind.In this example, further comprise, if switch module for open-minded in advance, it is open-minded that control module is adjusted the time-delay of control signal control switch module; If switch module is open-minded for lagging behind, it is open-minded in advance that control module is adjusted control signal control switch module.
In another example of the present utility model, synchronous detection module comprises first detecting unit and second detecting unit, in a switch periods, this control method further comprises: if high level signal of first detecting unit output and second detecting unit continue the output high level signal, control module judges that switch module is that no-voltage is open-minded synchronously; If two high level signals of first detecting unit output and second detecting unit continue the output high level signal, control module judges that switch module is for open-minded in advance; If high level signal of first detecting unit output and low level signal of second detecting unit output, control module judge that switch module is open-minded for lagging behind.In this example, further comprise: if switch module for open-minded in advance, control module is adjusted the control signal time-delay and is opened switch module; If switch module is open-minded for lagging behind, control module is adjusted control signal and is opened switch module in advance.
Go back in the example of the present utility model, synchronous detection module comprises first detecting unit and second detecting unit, in a switch periods, this control method further comprises: if low level signal of first detecting unit output and second detecting unit continue the output high level signal, control module judges that switch module is that no-voltage is open-minded synchronously; If two low level signals of first detecting unit output and second detecting unit continue the output high level signal, control module judges that switch module is for open-minded in advance; If low level signal of first detecting unit output and low level signal of second detecting unit output, control module judge that switch module is open-minded for lagging behind.In this example, further comprise: if switch module for open-minded in advance, control module is adjusted the control signal time-delay and is opened switch module; If switch module is open-minded for lagging behind, control module is adjusted control signal and is opened switch module in advance.
Control method according to electromagnetic heater of the present utility model, the current signal that can be in the electromagnetic heater course of work flows through switch module by detection is judged the operating state of switch module, adjust the time of opening with turn-offing of switch module simultaneously in real time according to this operating state, so that switch module continues to realize that no-voltage is open-minded, thereby reduce the turn-on consumption of switch, reduce the switch caloric value, improve the useful life of switch.In addition, this control method is simple and reliable.
The utility model is applicable to the heater that employing electromagnetism such as electromagnetic oven, electromagnetic rice cooker, electromagnetism electric pressure cooker heat.
Describe and to be understood that in the flow chart or in this any process of otherwise describing or method, expression comprises the module of code of the executable instruction of the step that one or more is used to realize specific logical function or process, fragment or part, and the scope of preferred implementation of the present utility model comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by opposite order, carry out function, this should be understood by embodiment person of ordinary skill in the field of the present utility model.
In flow chart the expression or in this logic of otherwise describing and/or step, for example, can be considered to the sequencing tabulation for the executable instruction that realizes logic function, may be embodied in any computer-readable medium, use for instruction execution system, device or equipment (as the computer based system, comprise that the system of processor or other can be from the systems of instruction execution system, device or equipment instruction fetch and execution command), or use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can comprise, storage, communication, propagation or transmission procedure be for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically of computer-readable medium (non-exhaustive list) comprises following: the electrical connection section (electronic installation) with one or more wirings, portable computer diskette box (magnetic device), random-access memory (ram), read-only memory (ROM), can wipe and to edit read-only memory (EPROM or flash memory), fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium even can be paper or other the suitable media that to print described program thereon, because can be for example by paper or other media be carried out optical scanner, then edit, decipher or handle to obtain described program in the electronics mode with other suitable methods in case of necessity, then it is stored in the computer storage.
Should be appreciated that each several part of the present utility model can realize with hardware, software, firmware or their combination.In the above-described embodiment, a plurality of steps or method can realize with being stored in the memory and by software or firmware that suitable instruction execution system is carried out.For example, if realize with hardware, the same in another embodiment, in the available following technology well known in the art each or their combination realize: have for the discrete logic of data-signal being realized the logic gates of logic function, application-specific integrated circuit (ASIC) with suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that and realize that all or part of step that above-described embodiment method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the utility model can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
In the description of this specification, concrete feature, structure, material or characteristics that the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example description are contained at least one embodiment of the present utility model or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete feature, structure, material or the characteristics of description can be with the suitable manner combination in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that under the situation that does not break away from principle of the present utility model and spirit and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present utility model is by claims and be equal to and limit.
Claims (10)
1. an electromagnetic heater is characterized in that, comprising:
Resonance heating module, described resonance heating module comprise the resonant circuit that resonance coil and resonant capacitance constitute;
Switch module, described switch module links to each other with described resonance heating module;
Sampling module, described sampling module links to each other with described switch module, and described sampling module is sampled the electric current of described switch module with the formation voltage signal;
Synchronous detection module, described synchronous detection module links to each other with described sampling module, and described synchronous detection module detects the voltage signal of described sampling module generation synchronously to generate detection signal when described switch module turns on and off;
The synchronous feedback module, described synchronous feedback module is connected the two ends of described resonance heating module, and described synchronous feedback module generates feedback signal according to the voltage at described resonance heating module two ends;
Control module, described control module links to each other with described synchronous feedback module, described synchronous detection module and described switch module respectively, and described control module is exported to the control signal of described switch module to realize the control to described switch module according to described feedback signal adjustment when described detection signal is unusual.
2. electromagnetic heater as claimed in claim 1, it is characterized in that, described synchronous detection module comprises first detecting unit and second detecting unit, the voltage signal output high-low level signal that described first detecting unit and second detecting unit generate according to described sampling module.
3. electromagnetic heater as claimed in claim 2 is characterized in that, described first detecting unit further comprises:
First resistance, an end of described first resistance links to each other with first reference power source;
Second resistance, an end of described second resistance links to each other with the other end of described first resistance, and the other end ground connection of described second resistance has first node between described second resistance and described first resistance;
First comparator, one in the output of the negative input end of described first comparator and described first node and described sampling module links to each other, in the output of the positive input terminal of described first comparator and described first node and described sampling module another links to each other, and the output of described first comparator links to each other with described control module.
4. electromagnetic heater as claimed in claim 3 is characterized in that, described second detecting unit further comprises:
The 3rd resistance, an end of described the 3rd resistance links to each other with second reference power source;
The 4th resistance, an end of described the 4th resistance links to each other with the other end of described the 3rd resistance, and the other end ground connection of described the 4th resistance has Section Point between described the 4th resistance and described the 3rd resistance;
Second comparator, one in the output of the positive input terminal of described second comparator and described Section Point and described sampling module links to each other, in the output of the negative input end of described second comparator and described Section Point and described sampling module another links to each other, and the output of described second comparator links to each other with described control module.
5. electromagnetic heater as claimed in claim 4, it is characterized in that, also comprise the 5th resistance and first electric capacity, one end of described the 5th resistance links to each other with an end of first electric capacity, described first detecting unit and described second detecting unit respectively, the other end of described the 5th resistance links to each other with described sampling module, the other end ground connection of described first electric capacity.
6. electromagnetic heater as claimed in claim 1 is characterized in that, described sampling module is the parallel circuits of the 6th resistance or current transformer and the formation of the 7th resistance.
7. electromagnetic heater as claimed in claim 6, it is characterized in that described sampling module is the 6th resistance, described switch module is IGBT, one end of described the 6th resistance links to each other with the emitter of described IGBT, and the other end of described the 6th resistance links to each other with the negative pole end of input power supply.
8. electromagnetic heater as claimed in claim 6, it is characterized in that, described switch module is IGBT, described sampling module is the parallel circuits that current transformer and the 7th resistance form, one end of the primary coil of described current transformer links to each other with the emitter of described IGBT, the other end of the primary coil of described current transformer links to each other with the negative pole end of input power supply, the secondary coil of described current transformer is in parallel with described the 7th resistance, one end of the secondary coil of described current transformer links to each other with described synchronous detection module respectively with an end of described the 7th resistance, and the other end of the other end of the secondary coil of described current transformer and described the 7th resistance is ground connection respectively.
9. electromagnetic heater as claimed in claim 6, it is characterized in that, described switch module is IGBT, described sampling module is the parallel circuits that current transformer and the 7th resistance form, one end of the primary coil of described current transformer links to each other with an end of described resonance heating module, the other end of the primary coil of described current transformer links to each other with the collector electrode of described IGBT, the secondary coil of described current transformer is in parallel with described the 7th resistance, one end of the secondary coil of described current transformer links to each other with described synchronous detection module respectively with an end of described the 7th resistance, and the other end of the other end of the secondary coil of described current transformer and described the 7th resistance is ground connection respectively.
10. electromagnetic heater as claimed in claim 1 is characterized in that, also comprises:
Driver module, described driver module are connected between described control module and the described switch module, and described driver module generates opening or turn-offing of the driving described switch module of signal controlling according to the control signal of described control module output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320081030 CN203136220U (en) | 2013-02-21 | 2013-02-21 | Electromagnetic heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320081030 CN203136220U (en) | 2013-02-21 | 2013-02-21 | Electromagnetic heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203136220U true CN203136220U (en) | 2013-08-14 |
Family
ID=48944150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320081030 Expired - Fee Related CN203136220U (en) | 2013-02-21 | 2013-02-21 | Electromagnetic heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203136220U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103596307A (en) * | 2013-11-05 | 2014-02-19 | 美的集团股份有限公司 | Resonance control circuit and electromagnetic heating device |
| CN104582044A (en) * | 2013-10-18 | 2015-04-29 | 美的集团股份有限公司 | Control circuit and control method for electromagnetic heating device |
| WO2016123897A1 (en) * | 2015-02-02 | 2016-08-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating control circuit and electromagnetic heating device |
| CN106851881A (en) * | 2015-12-07 | 2017-06-13 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its heating control apparatus |
| CN105991005B (en) * | 2015-02-03 | 2018-09-04 | 佛山市顺德区美的电热电器制造有限公司 | Intelligent power module integrated circuit and household electrical appliance |
| CN110031123A (en) * | 2018-01-04 | 2019-07-19 | 联发科技股份有限公司 | Heat sensor integrated circuit and resistor for heat sensor |
| CN110351910A (en) * | 2018-04-02 | 2019-10-18 | 佛山市顺德区美的电热电器制造有限公司 | A kind of temperature rise control method, device, electromagnetic equipment and storage medium |
| CN110613313A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| CN113904461A (en) * | 2021-10-11 | 2022-01-07 | 陈文芗 | a converter |
-
2013
- 2013-02-21 CN CN 201320081030 patent/CN203136220U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104582044A (en) * | 2013-10-18 | 2015-04-29 | 美的集团股份有限公司 | Control circuit and control method for electromagnetic heating device |
| CN103596307A (en) * | 2013-11-05 | 2014-02-19 | 美的集团股份有限公司 | Resonance control circuit and electromagnetic heating device |
| KR102057136B1 (en) * | 2015-02-02 | 2020-01-22 | 포샨 순더 메이디 일렉트리컬 히팅 어플라이언시스 메뉴팩쳐링 코., 리미티드 | Electromagnetic heating control circuit and electromagnetic heating device |
| WO2016123897A1 (en) * | 2015-02-02 | 2016-08-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating control circuit and electromagnetic heating device |
| KR20170113633A (en) * | 2015-02-02 | 2017-10-12 | 포샨 순더 메이디 일렉트리컬 히팅 어플라이언시스 메뉴팩쳐링 코., 리미티드 | Electromagnetic heating control circuit and electromagnetic heating device |
| US10638551B2 (en) | 2015-02-02 | 2020-04-28 | Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co., Ltd | Electromagnetic heating control circuit and electromagnetic heating device |
| CN105991005B (en) * | 2015-02-03 | 2018-09-04 | 佛山市顺德区美的电热电器制造有限公司 | Intelligent power module integrated circuit and household electrical appliance |
| CN106851881A (en) * | 2015-12-07 | 2017-06-13 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its heating control apparatus |
| CN106851881B (en) * | 2015-12-07 | 2023-11-03 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its heating control device |
| CN110031123A (en) * | 2018-01-04 | 2019-07-19 | 联发科技股份有限公司 | Heat sensor integrated circuit and resistor for heat sensor |
| CN110351910A (en) * | 2018-04-02 | 2019-10-18 | 佛山市顺德区美的电热电器制造有限公司 | A kind of temperature rise control method, device, electromagnetic equipment and storage medium |
| CN110351910B (en) * | 2018-04-02 | 2022-03-11 | 佛山市顺德区美的电热电器制造有限公司 | Temperature rise control method and device, electromagnetic equipment and storage medium |
| CN110613313A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| CN110613313B (en) * | 2018-06-20 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| CN113904461A (en) * | 2021-10-11 | 2022-01-07 | 陈文芗 | a converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203136220U (en) | Electromagnetic heating device | |
| CN104010399B (en) | Electromagnetic heater and control method thereof | |
| CN103715886B (en) | Four-switch buck/boost mode converter control method and control circuit | |
| CN103841725B (en) | To release control module, controllable silicon light modulation LED drive circuit and system | |
| CN101925214B (en) | LED constant current circuit and method | |
| CN102076149A (en) | Light source drive circuit, controller and method for controlling light source brightness | |
| CN103051160B (en) | Magnetic isolation driving circuit | |
| CN106374751B (en) | A kind of synchronous rectification control chip | |
| CN101834516A (en) | Multimode frequency controller and switch power supply frequency control method | |
| CN106452086B (en) | A kind of synchronous commutating control circuit | |
| CN107809171A (en) | The driving method and drive circuit of Switching Power Supply and its power switch pipe | |
| CN107147302B (en) | A kind of numerical control system and its control method of synchronous rectification LLC converter | |
| CN109510481A (en) | A kind of synchronous commutating control circuit and control method | |
| CN103916997B (en) | Electromagnetic induction heater and control method thereof | |
| CN101511141B (en) | Control technique for switch power supply, inductance and current | |
| CN103151000B (en) | Backlight driving circuit and driving method thereof and liquid crystal display device | |
| CN101599693A (en) | Fast response device and method of switching power converter | |
| CN106714392A (en) | Sectional switching lighting adjustment control drive circuit with LED open circuit protection | |
| CN103731945B (en) | Prevent control method and the control circuit of electromagnetic heater failure of oscillation | |
| CN107172733A (en) | A kind of electromagnetic heating system and its method of work | |
| CN203788514U (en) | Discharge control module, silicon controlled rectifier light dimming LED drive circuit and system | |
| CN205017636U (en) | A peak current detection circuitry for LED constant -current drive circuit | |
| CN206533586U (en) | Block switch brightness adjustment control drive circuit with LED open-circuit-protections | |
| CN2884685Y (en) | Microwave oven magnetron variable frequency power supply | |
| CN103916006A (en) | Drive circuit of inductive device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130814 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |