CN101500350B - Electromagnetic furnace control circuit and electromagnetic furnace using the same - Google Patents
Electromagnetic furnace control circuit and electromagnetic furnace using the same Download PDFInfo
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- CN101500350B CN101500350B CN 200810009028 CN200810009028A CN101500350B CN 101500350 B CN101500350 B CN 101500350B CN 200810009028 CN200810009028 CN 200810009028 CN 200810009028 A CN200810009028 A CN 200810009028A CN 101500350 B CN101500350 B CN 101500350B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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Abstract
The invention relates to a control circuit for an induction cooker and the induction cooker using the control circuit. The induction cooker comprises an induction coil and a switch element, wherein the induction coil is coupled between a supply voltage and a first end of the switch element, and a second end of the switch element is coupled with a public voltage. The control circuit comprises a first comparator, a second comparator and a pulse generating circuit, wherein the first comparator receives voltages at the two ends of the induction coil to output trigger signals, and the second comparator receives voltage reference and voltage at the first end of the switch element. When the voltage at the first end of the switch element is larger than the reference voltage, the second comparator leads the signals to be attenuated. When the trigger signals are enabled, the pulse generating circuit can output pulse to control the switch element. When the fading signals are enabled, the pulse generating circuit reduces the width of pulse.
Description
Technical field
The invention relates to the technology that a kind of electromagnetic oven is relevant, and particularly relevant for a kind of electromagnetic oven control circuit and use its electromagnetic oven.
Background technology
In recent years, because the progress of science and technology, electromagnetic oven has become the indispensable electrical appliance of modern.Electromagnetic stove is a kind of kitchen appliance that utilizes electromagnetic induction principle to convert electrical energy into heat energy.In electromagnetic stove inside, by rectification circuit the alternating voltage of 50/60Hz is become direct voltage, convert direct voltage to high frequency voltage that frequency is 20-40KHz through control circuit again, the electric current that changes flows through the magnetic field that coil can produce the high speed variation at a high speed, the magnetic line of force in magnetic field passes through metalware, particularly magnetic conduction electric conducting material again, produces countless little eddy current in the bottom metal body, make vessel heating at a high speed voluntarily itself, and then the thing in the heating vessel.
Fig. 1 is the circuit block diagram of known electromagnetic oven.Please refer to Fig. 1, this electromagnetic oven circuit comprises induction coil 10, capacitor 11, bridge rectifier 12, insulation lock bipolar transistor (Insulated Gate BipolarTransistor, IGBT) 13 and electromagnetic oven control circuit 14, wherein electromagnetic oven control circuit 14 comprises pulse-generating circuit 141, comparator 142 and firmware 143.Firmware 143 mainly is to be used for control impuls generation circuit 141.Because the user can control the control panel of electromagnetic oven outside and operate, for example, firepower and switching on and shutting down.And firmware 143 is exactly the operation according to above-mentioned user, comes control impuls to produce the running of circuit 141.When the user set firepower for " by force ", then firmware 143 can the control control impuls produce the pulse of circuit 141 output pulse width broads to insulation lock bipolar transistor 13.When the user set firepower for " weak ", then firmware 143 can control impuls produce the narrower pulse of circuit 141 output pulse widths to insulation lock bipolar transistor 13.
When electromagnetic oven started, insulation lock bipolar transistor 13 was given in pulse-generating circuit 141 first pulse of output earlier, made 13 conductings of insulation lock bipolar transistor.Because two inputs of comparator 142 are coupled in the two ends of induction coil 10, therefore, when ending again after 13 conductings of insulation lock bipolar transistor, induction coil 10 can begin concussion with capacitor 11, thereby makes the output of comparator 142 change positive saturation voltage into by negative saturation voltage originally.When pulse-generating circuit 141 receives the pulse of the positive saturation voltage that comparator 142 exported at every turn, just can export pulse once more and give insulation lock bipolar transistor 13.
In addition, firmware 143 is also in order to protect.When pan removed on by electromagnetic oven, the energy of induction coil 10 had no way of discharging, and can cause the overtension of the node A of insulation lock bipolar transistor 13, therefore needed to reduce the width of output pulse.When firmware 143 detects the overtension of node A, just can control impuls produce circuit 141, the width of its pulse of exporting is reduced.In addition, when firmware 143 detects the rising of the voltage emergentness of the Node B of bridge rectifier 12 or C, expression surge (surge) takes place, and firmware 143 just can control impuls produces circuit 141 and make it stop to export pulse this moment.
Yet, because firmware 143 needs certain judgement time, usually can cause the energy of induction coil 10 to discharge during this period of time, make the voltage of node A continue to raise.When the pressure drop of insulation lock bipolar transistor 13 surpasses predetermined voltage, when in general being 1200V, just can burn.
Summary of the invention
In view of this, purpose of the present invention is exactly the electromagnetic oven that is to provide a kind of electromagnetic oven control circuit and uses it, burns in order to the inner member of avoiding electromagnetic oven, and simplifies production procedure and reduce the element cost.
For reaching above-mentioned or other purposes, the present invention proposes a kind of electromagnetic oven.This electromagnetic oven comprises induction coil, switch element and control circuit.One end of induction coil couples supply voltage.First end of switch element couples the other end of induction coil, and second end of switch element couples and connects voltage altogether.Control circuit comprises first comparator, second comparator and pulse-generating circuit.The first input end of first comparator couples first end of induction coil.Second input of first comparator couples second end of induction coil.The output output triggering signal of first comparator.The first input end of second comparator couples first reference voltage, and second input of second comparator couples first end of switch element.The output output attenuatoin signal of second comparator.When the voltage of second input of second comparator during greater than first reference voltage, second comparator enables deamplification.The output of pulse-generating circuit couples the control end of switch element.When triggering signal enabled, the output of pulse-generating circuit output pulse was with the control switch element.When deamplification enabled, pulse-generating circuit reduced the pulse duration of the pulse of being exported.
According to the described electromagnetic oven control circuit of preferred embodiment of the present invention and use its electromagnetic oven, above-mentioned electromagnetic oven also comprises rectifier.This rectifier can comprise first end, second end, the 3rd end and the 4th end for bridge rectifier, wherein its first end with and second end couple alternating-current voltage source respectively, its 3rd end output supply voltage, the output of its 4th end connects voltage altogether.In an embodiment, control circuit also comprises the 3rd comparator.The first input end of this 3rd comparator couples second reference voltage.The second input selectivity of the 3rd comparator couples first end or second end of bridge rectifier.The output output stop signal of the 3rd comparator.When the voltage of second input during greater than second reference voltage, enable stop signal, wherein, pulse-generating circuit couples the output of the 3rd comparator, and receives above-mentioned stop signal, and when stop signal enabled, pulse-generating circuit stopped to export pulse.
According to the described electromagnetic oven control circuit of preferred embodiment of the present invention and use its electromagnetic oven, above-mentioned control circuit also comprises low pass filter.Low pass filter coupled is between the output and pulse-generating circuit of first comparator, in order to filter the assorted letter of above-mentioned triggering signal.In an embodiment, control circuit also comprises first buffer and second buffer.First buffer is in order to store the responsibility cycle data, and second buffer is in order to store difference data, and wherein pulse-generating circuit is according to the responsibility cycle of responsibility cycle data decision pulse.When deamplification enabled, pulse-generating circuit deducted difference data according to the responsibility cycle data, the responsibility cycle of decision pulse.
According to the described electromagnetic oven control circuit of preferred embodiment of the present invention and use its electromagnetic oven, above-mentioned control circuit comprises the pan testing circuit.This pan testing circuit couples pulse-generating circuit with received pulse.In the given time, the pan testing circuit is according to the cycle of pulse, to judge the size of pan.In an embodiment, control circuit also comprises the impulse phase control circuit.This impulse phase control circuit couples pulse-generating circuit, and to produce the pulse that circuit exported with control impuls be high potential or electronegative potential.
According to the described electromagnetic oven control circuit of preferred embodiment of the present invention and use its electromagnetic oven, above-mentioned pulse-generating circuit comprises the decay control end and stops control end, and described control circuit also comprises commutation circuit.The first input end of this commutation circuit couples the output of second comparator, and its second input couples the output of the 3rd comparator, and its first output couples the decay control end, and its second output couples and stops control end.Couple first end of switch element when the first input end of second comparator, and when second input of the 3rd comparator couples bridge rectifier, circuit turn-on between the first input end of commutation circuit and first output, and second input of commutation circuit and the circuit turn-on between second output.When the first input end of described second comparator couples first end of bridge rectifier or second end, and second input of the 3rd comparator couples first end of switch element, circuit turn-on between the first input end of commutation circuit and second output, and second input of commutation circuit and the circuit turn-on between first output.In an embodiment, switch element is insulation lock bipolar transistor.In an embodiment, electromagnetic oven also comprises capacitor.The two ends of this capacitor are respectively coupled to the two ends of induction coil.
Spirit of the present invention is to be to integrate comparator and pulse generator in single-chip, control the slow excessively situation of pulse-width modulation reaction speed except that solving existing software and the microprocessor of utilizing, also but simplified system design and production procedure improve advantages such as the rate that manufactures a finished product.With existing technology, still there is not the special-purpose single-chip of so integrating that is applied to charger.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the circuit block diagram of known electromagnetic oven.
Fig. 2 is the circuit block diagram of the electromagnetic oven that illustrates according to the embodiment of the invention.
Fig. 3 is the operation waveform diagram of the electromagnetic oven that illustrates according to the embodiment of the invention.
Fig. 4 A is the circuit block diagram of the electromagnetic oven that illustrates according to the embodiment of the invention.
Fig. 4 B is the operation waveform diagram of the electromagnetic oven that illustrates according to the embodiment of the invention.
Fig. 5 is the circuit block diagram of the electromagnetic oven control circuit 23 that illustrates according to the embodiment of the invention.
Drawing reference numeral:
10,21: induction coil
11: capacitor
12,40: bridge rectifier
13: insulation lock bipolar transistor
14,23: the electromagnetic oven control circuit
141,233: pulse-generating circuit
142: comparator
143: firmware
22: switch element
231: the first comparators
232: the second comparators
41: insulation lock bipolar transistor
423: the three comparators
424: the pan testing circuit
425: low pass filter
426: the first buffers
427: the second buffers
C401, C402: capacitor
D1, D2: diode
R1～R6: resistance
501: commutation circuit
Embodiment
Fig. 2 is the circuit diagram of the electromagnetic oven that illustrates according to the embodiment of the invention.Please refer to Fig. 2, this electromagnetic oven comprises the electromagnetic oven control circuit 23 of induction coil 21, switch element 22 and the embodiment of the invention, and wherein, this electromagnetic oven control circuit 23 comprises first comparator 231, second comparator 232 and pulse-generating circuit 233.The relation of coupling as the figure of the circuit of this electromagnetic oven illustrate.
Fig. 3 is the operation waveform diagram of the electromagnetic oven that illustrates according to the embodiment of the invention.Please also refer to Fig. 2 and Fig. 3, when the user started this electromagnetic oven, pulse-generating circuit 233 can make switch element 22 conductings by output start pulse P.This moment, electric current just can flow through induction coil 21.The scheduled time after switch cuts out, the voltage at the coil two ends triggering signal TR that causes first comparator 231 to be exported that can change transfers positive saturation voltage to by negative saturation voltage, and triggering signal TR can transfer negative saturation voltage to by positive saturation voltage afterwards.When triggering signal TR was transferred to negative saturation voltage by positive saturation voltage, pulse-generating circuit 233 can be exported pulse P once more and make switch element 22 conductings.
When electromagnetic oven in when running, the user removes bowl suddenly, at this moment, because induction coil 21 stored energy moment can't discharge, makes the voltage of node E of switch element 22 rise.In an embodiment of the present invention, the first input end of second comparator 232 couples reference voltage Vref, and second input of second comparator 232 couples the node E of switch element 22.When the voltage of node E during greater than reference voltage Vref, the deamplification FD that second comparator 232 is exported just can enable.When pulse-generating circuit 233 detects deamplification FD and enables, just can reduce the pulse duration of next pulse P, the voltage of node E is descended, to avoid burning of switch element 22.
What deserves to be mentioned is, though in the foregoing description to the electromagnetic oven control circuit of the embodiment of the invention and use its electromagnetic oven to depict a possible kenel, but affiliated technical field related personnel should know, each manufacturer is all different for the design and the coupling mode of electromagnetic oven control circuit 23, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as at electromagnetic oven control circuit 23 inner built-in at least one comparator 212, in order to relatively this reference voltage Vref and the voltage of being feedback by switch element 22, determine whether that pulsewidth with pulse P reduces or closes, be to have met spiritual place of the present invention just.
In addition, affiliated technical field related personnel should know, the height of electromagnetic oven the control circuit 23 because voltage at the two ends of induction coil 21 compares, therefore between above-mentioned first comparator 231 and second comparator 232 and induction coil 21, must be with the means of dividing potential drop, in order to avoid the overtension at induction coil 21 two ends and burn electromagnetic oven control circuit 23.So the foregoing description there is no and does detailed illustrating.
Next just again for several embodiment so that this area related personnel can utilize spirit of the present invention to implement the present invention.
Fig. 4 A is the circuit block diagram of the electromagnetic oven that illustrates according to the embodiment of the invention.Please refer to Fig. 4 A, in this embodiment, switch element 22 usefulness insulation lock bipolar transistor 41 is implemented.In addition, electromagnetic oven control circuit 23 has also additionally increased the 3rd comparator 423, pan testing circuit 424, low pass filter 425, first buffer 426 and second buffer 427.For more detailed explanation present embodiment, this electromagnetic oven control circuit has also comprised capacitor C401, C402, bridge rectifier 40, diode D1, D2 and resistance R 1～R6.The relation of coupling as the figure of this circuit illustrate.
In this embodiment, capacitor C401 is in order to cooperate induction coil 21 to make resonance.When electromagnetic oven operates, pulse generator 233 can determine the responsibility cycle of pulse P according to responsibility cycle data stored in first buffer 426, and with the gate that pulse P exports to insulation lock bipolar transistor 41, makes its conducting.Afterwards, capacitor C401 and induction coil 21 will produce resonance, make the triggering signal TR of first comparator 231 begin concussion.When triggering signal TR transferred logic low-voltage to by logic high voltage, pulse-generating circuit 233 can be exported a pulse P once more.When the user removes pan,, the voltage of node E is risen because the energy of induction coil 21 can't discharge.As the dividing potential drop Vd1 of node E during greater than reference voltage Vref 1, the deamplification FD that second comparator 232 is exported just can enable, pulse generator 233 just can capture stored difference data in the responsibility cycle data stored in first buffer 426 and second buffer 427, and the responsibility cycle data are deducted after the difference data responsibility cycle of the pulse P that decides next to be exported.Because after the responsibility cycle of pulse P diminished, the ON time of relative insulation lock bipolar transistor 41 also diminished, the voltage of node E is descended.
In addition, when general operation, rectification that diode D1, D2, capacitor C402 and resistance R 5 and R6 are constituted and bleeder circuit can't the generation effects, and the voltage of node H can be greater than reference voltage Vref 2 yet.Yet, when thunderbolt or when disturb taking place, please refer to Fig. 4 B, node F or node G will rise by transient voltage, make the voltage of node H greater than internal reference voltage Vref2, and at this moment, the stop signal St that the 3rd comparator 423 is exported just can enable.When stop signal St enabled, pulse-generating circuit 233 just can stop to export pulse P, to avoid circuit burnout.
Fig. 5 is the circuit block diagram of the electromagnetic oven control circuit 23 that illustrates according to the embodiment of the invention.Please refer to Fig. 5, in this circuit, additionally increased commutation circuit 501 and impulse phase control circuit 502.Because after the integrated circuit encapsulation was finished, pressure point was just fixing.But, usually can run into because of pressure point and fixedly make the inconvenience of circuit layout.In this embodiment, commutation circuit 501 can be in order to exchange the output of second comparator 232 and the 3rd comparator 423.Please also refer to Fig. 4 A, Fig. 4 B and Fig. 5, when second comparator 232 in order to couple node H, and the 3rd comparator 423 is when coupling node E, the output of second comparator 232 just can be couple to node M, and in order to output stop signal St, the output of the 3rd comparator 423 can be couple to node N, and in order to output attenuatoin signal FD.When second comparator 232 in order to couple node E, and the 3rd comparator 423 is when coupling node H, and the output of second comparator 232 just can be couple to node N, and in order to output attenuatoin signal FD, the output of the 3rd comparator 423 can be couple to node M, and in order to output stop signal St.
In addition, on some is used, can need anti-phase pulse, therefore in this embodiment, also comprise impulse phase control circuit 502, so that electronegative potential at ordinary times to be provided, pulse high potential and high potential at ordinary times, the pulse of two kinds of outs of phase of pulse electronegative potential.
In sum, spirit of the present invention is to be to integrate comparator and pulse generator in single-chip, control the slow excessively situation of pulse-width modulation reaction speed except that solving existing software and the microprocessor of utilizing, but also simplified system design and production procedure improves advantages such as the rate that manufactures a finished product.With existing technology, still there is not the special-purpose single-chip of so integrating that is applied to charger.
In addition, in an embodiment of the present invention, coupled a commutation circuit 501 between second comparator, the 3rd comparator and the pulse generator 233, therefore, on the layout of circuit, bigger elasticity can have been arranged.
The specific embodiment that is proposed in the detailed description of preferred embodiment is only in order to convenient explanation technology contents of the present invention, but not with narrow sense of the present invention be limited to the foregoing description, in the situation that does not exceed spirit of the present invention and claims, the many variations of being done is implemented, and all belongs to scope of the present invention.Therefore protection scope of the present invention is as the criterion when looking defining of claims.
Claims (29)
1. control circuit, in order to the control electromagnetic oven, it is characterized in that, described electromagnetic oven comprises induction coil and switch element, wherein said induction coil is coupled between first end of supply voltage and switch element, second end of described switch element couples and connects voltage altogether, and described control circuit comprises:
First comparator, its first input end couple first end of described induction coil, and its second input couples second end of described induction coil, its output output triggering signal;
Second comparator, its first input end couples first reference voltage, and its second input couples first end of described switch element, its output output attenuatoin signal, when the voltage of described second input during, enable described deamplification greater than described first reference voltage; And
Pulse-generating circuit, when described triggering signal transferred the accurate position of first logic to by the accurate position of second logic, the output pulse was to control described switch element, and when described deamplification enabled, described pulse-generating circuit reduced the pulse duration of described pulse.
2. control circuit as claimed in claim 1 is characterized in that, described electromagnetic oven comprises:
Bridge rectifier comprises first end, second end, the 3rd end and the 4th end, wherein its first end with and second end couple alternating-current voltage source respectively, its 3rd end is exported described supply voltage, the described voltage that connects altogether of its 4th end output.
3. control circuit as claimed in claim 2 is characterized in that, described control circuit also comprises:
The 3rd comparator, its first input end couples second reference voltage, and its second input selectivity couples first end or second end of described bridge rectifier, its output output stop signal, when the voltage of described second input during, enable described stop signal greater than described second reference voltage
Wherein, described pulse-generating circuit couples the output of described the 3rd comparator, and receives described stop signal, and when described stop signal enabled, described pulse-generating circuit stopped to export described pulse.
4. control circuit as claimed in claim 1 is characterized in that, described control circuit also comprises:
Low pass filter is coupled between the output and described pulse-generating circuit of described first comparator, in order to the assorted letter of the described triggering signal of filtering.
5. control circuit as claimed in claim 1 is characterized in that, described control circuit also comprises:
First buffer is in order to store the responsibility cycle data; And
Second buffer, in order to the storage difference data,
Wherein, described pulse-generating circuit determines the responsibility cycle of described pulse according to described responsibility cycle data, when described deamplification enabled, described pulse-generating circuit deducted described difference data according to described responsibility cycle data, determines the responsibility cycle of described pulse.
6. control circuit as claimed in claim 1 is characterized in that, described control circuit also comprises:
The pan testing circuit couples described pulse-generating circuit, receives described pulse, in the given time, and according to the cycle of described pulse, to judge the size of pan.
7. control circuit as claimed in claim 1 is characterized in that described control circuit also comprises the impulse phase control circuit, couples described pulse-generating circuit, is high potential or electronegative potential in order to control the described pulse that described pulse-generating circuit exports.
8. control circuit as claimed in claim 3 is characterized in that, described pulse-generating circuit comprises the decay control end and stops control end, and described control circuit also comprises:
Commutation circuit, its first input end couples the output of described second comparator, and its second input couples the output of described the 3rd comparator, and its first output couples described decay control end, and its second output couples the described control end that stops,
Wherein, couple first end of described switch element when second input of described second comparator, and when second input of described the 3rd comparator couples described bridge rectifier, circuit turn-on between the first input end of described commutation circuit and first output, and second input of described commutation circuit and the circuit turn-on between second output, when second input of described second comparator couples first end of described bridge rectifier or second end, and second input of described the 3rd comparator couples first end of described switch element, circuit turn-on between the first input end of described commutation circuit and second output, and second input of described commutation circuit and the circuit turn-on between first output.
9. control circuit as claimed in claim 1 is characterized in that, described switch element is insulation lock bipolar transistor.
10. control circuit as claimed in claim 1 is characterized in that, described electromagnetic oven also comprises:
Capacitor, one end couple an end of described induction coil, and its other end couples the other end of described induction coil.
11. an electromagnetic oven is characterized in that, described electromagnetic oven comprises:
Induction coil, the one end couples supply voltage;
Switch element, its first end couples the other end of described induction coil, and second end of described switch element couples and connects voltage altogether; And
Control circuit comprises:
First comparator, its first input end couple first end of described induction coil, and its second input couples second end of described induction coil, its output output triggering signal;
Second comparator, its first input end couples first reference voltage, and its second input couples first end of described switch element, its output output attenuatoin signal, when the voltage of described second input during, enable described deamplification greater than described first reference voltage; And
Pulse-generating circuit, its output couples the control end of described switch element, when described triggering signal transfers the accurate position of first logic to by the accurate position of second logic, its output output pulse is to control described switch element, when described deamplification enabled, described pulse-generating circuit reduced the pulse duration of described pulse.
12. electromagnetic oven as claimed in claim 11 is characterized in that, described electromagnetic oven also comprises:
Bridge rectifier comprises first end, second end, the 3rd end and the 4th end, wherein its first end with and second end couple alternating-current voltage source respectively, its 3rd end is exported described supply voltage, the described voltage that connects altogether of its 4th end output.
13. electromagnetic oven as claimed in claim 12 is characterized in that, described control circuit comprises:
The 3rd comparator, its first input end couples second reference voltage, and its second input selectivity couples first end or second end of described bridge rectifier, its output output stop signal, when the voltage of described second input during, enable described stop signal greater than described second reference voltage
Wherein, described pulse-generating circuit couples the output of described the 3rd comparator, and receives described stop signal, and when described stop signal enabled, described pulse-generating circuit stopped to export described pulse.
14. electromagnetic oven as claimed in claim 11 is characterized in that, described control circuit comprises:
Low pass filter is coupled between the output and described pulse-generating circuit of described first comparator, in order to the assorted letter of the described triggering signal of filtering.
15. electromagnetic oven as claimed in claim 11 is characterized in that, described control circuit comprises:
First buffer is in order to store the responsibility cycle data; And
Second buffer, in order to the storage difference data,
Wherein, described pulse-generating circuit determines the responsibility cycle of described pulse according to described responsibility cycle data, when described deamplification enabled, described pulse-generating circuit deducted described difference data according to described responsibility cycle data, determines the responsibility cycle of described pulse.
16. electromagnetic oven as claimed in claim 11 is characterized in that, described control circuit comprises:
The pan testing circuit couples described pulse-generating circuit, receives described pulse, in the given time, counts the cycle of described pulse, to judge the size of pan.
17. electromagnetic oven as claimed in claim 11 is characterized in that, described control circuit comprises the impulse phase control circuit, couples described pulse-generating circuit, is high potential or electronegative potential in order to control the described pulse that described pulse-generating circuit exports.
18. electromagnetic oven as claimed in claim 13 is characterized in that, described pulse-generating circuit comprises the decay control end and stops control end, and described control circuit also comprises:
Commutation circuit, its first input end couples the output of described second comparator, and its second input couples the output of described the 3rd comparator, and its first output couples described decay control end, and its second output couples the described control end that stops,
Wherein, couple first end of described switch element when second input of described second comparator, and when second input of described the 3rd comparator couples described bridge rectifier, circuit turn-on between the first input end of described commutation circuit and first output, and second input of described commutation circuit and the circuit turn-on between second output, when second input of described second comparator couples first end of described bridge rectifier or second end, and second input of described the 3rd comparator couples first end of described switch element, circuit turn-on between the first input end of described commutation circuit and second output, and second input of described commutation circuit and the circuit turn-on between first output.
19. electromagnetic oven as claimed in claim 11 is characterized in that, described switch element is insulation lock bipolar transistor.
20. electromagnetic oven as claimed in claim 11 is characterized in that, described electromagnetic oven also comprises:
Capacitor, one end couple an end of described induction coil, and its other end couples the other end of described induction coil.
21. control circuit, in order to the control electromagnetic oven, it is characterized in that, described electromagnetic oven comprises induction coil, bridge rectifier and switch element, wherein said induction coil is coupled between first end of supply voltage and switch element, second end of described switch element couples and connects voltage altogether, described bridge rectifier comprises first end, second end, the 3rd end and the 4th end, wherein its first end with and second end couple alternating-current voltage source respectively, its the 3rd end is exported described supply voltage, the described voltage that connects altogether of its 4th end output, described control circuit comprises:
First comparator, its first input end couple first end of described induction coil, and its second input couples second end of described induction coil, its output output triggering signal;
The 3rd comparator, its first input end couples second reference voltage, and its second input selectivity couples first end or second end of described bridge rectifier, its output output stop signal, when the voltage of described second input during, enable described stop signal greater than described second reference voltage;
Pulse-generating circuit, couple the output of described first comparator and described the 3rd comparator, and receive described stop signal and described triggering signal, when described triggering signal transfers the accurate position of first logic to by the accurate position of second logic, the output pulse is to control described switch element, when described stop signal enabled, described pulse-generating circuit stopped to export described pulse.
22. control circuit as claimed in claim 21 is characterized in that, described control circuit also comprises:
Second comparator, its first input end couples first reference voltage, and its second input couples first end of described switch element, its output output attenuatoin signal, when the voltage of described second input during, enable described deamplification greater than described first reference voltage
Wherein, described pulse-generating circuit couples the output of described second comparator, and receives described deamplification, and when described deamplification enabled, described pulse-generating circuit reduced the pulse duration of described pulse.
23. control circuit as claimed in claim 21 is characterized in that, described control circuit also comprises:
Low pass filter is coupled between the output and described pulse-generating circuit of described first comparator, in order to the assorted letter of the described triggering signal of filtering.
24. control circuit as claimed in claim 21 is characterized in that, described control circuit also comprises:
First buffer is in order to store the responsibility cycle data; And
Second buffer, in order to the storage difference data,
Wherein, described pulse-generating circuit determines the responsibility cycle of described pulse according to described responsibility cycle data, when described deamplification enabled, described pulse-generating circuit deducted described difference data according to described responsibility cycle data, determines the responsibility cycle of described pulse.
25. control circuit as claimed in claim 21 is characterized in that, described control circuit also comprises:
The pan testing circuit couples described pulse-generating circuit, receives described pulse, in the given time, counts the cycle of described pulse, to judge the size of pan.
26. control circuit as claimed in claim 21 is characterized in that, described control circuit also comprises the impulse phase control circuit, couples described pulse-generating circuit, is high potential or electronegative potential in order to control the described pulse that described pulse-generating circuit exports.
27. control circuit as claimed in claim 22 is characterized in that, described pulse-generating circuit comprises the decay control end and stops control end, and described control circuit also comprises:
Commutation circuit, its first input end couples the output of described second comparator, and its second input couples the output of described the 3rd comparator, and its first output couples described decay control end, and its second output couples the described control end that stops,
Wherein, couple first end of described switch element when second input of described second comparator, and when second input of described the 3rd comparator couples described bridge rectifier, circuit turn-on between the first input end of described commutation circuit and first output, and second input of described commutation circuit and the circuit turn-on between second output, when second input of described second comparator couples first end of described bridge rectifier or second end, and second input of described the 3rd comparator couples first end of described switch element, circuit turn-on between the first input end of described commutation circuit and second output, and second input of described commutation circuit and the circuit turn-on between first output.
28. control circuit as claimed in claim 21 is characterized in that, described switch element is insulation lock bipolar transistor.
29. control circuit as claimed in claim 21 is characterized in that, described electromagnetic oven also comprises:
Capacitor, one end couple an end of described induction coil, and its other end couples the other end of described induction coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810009028 CN101500350B (en) | 2008-01-30 | 2008-01-30 | Electromagnetic furnace control circuit and electromagnetic furnace using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810009028 CN101500350B (en) | 2008-01-30 | 2008-01-30 | Electromagnetic furnace control circuit and electromagnetic furnace using the same |
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| Publication Number | Publication Date |
|---|---|
| CN101500350A CN101500350A (en) | 2009-08-05 |
| CN101500350B true CN101500350B (en) | 2011-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200810009028 Active CN101500350B (en) | 2008-01-30 | 2008-01-30 | Electromagnetic furnace control circuit and electromagnetic furnace using the same |
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| ES2385091B1 (en) * | 2010-04-27 | 2013-05-28 | Bsh Electrodomésticos España, S.A. | COOKING HOB DEVICE. |
| CN104754789B (en) * | 2013-12-25 | 2016-08-17 | 美的集团股份有限公司 | The electromagnetic heater of Intelligent Recognition pan size and control method thereof |
| CN104850165B (en) * | 2015-03-16 | 2017-06-20 | 昂宝电子（上海）有限公司 | Control circuit, control method and its electromagnetic oven for electromagnetic oven |
| CN109324347B (en) * | 2017-07-31 | 2020-04-10 | 佛山市顺德区美的电热电器制造有限公司 | Pot detection method and device for induction cooker |
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