CN104582047A - Electromagnetic oven simulating naked flames, and power control method of electromagnetic oven - Google Patents
Electromagnetic oven simulating naked flames, and power control method of electromagnetic oven Download PDFInfo
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- CN104582047A CN104582047A CN201410805681.9A CN201410805681A CN104582047A CN 104582047 A CN104582047 A CN 104582047A CN 201410805681 A CN201410805681 A CN 201410805681A CN 104582047 A CN104582047 A CN 104582047A
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Abstract
The invention is applied to the field of electromagnetic equipment, and provides an electromagnetic oven simulating naked flames, and a power control method of the electromagnetic oven. The electromagnetic oven comprises a direct-current power source, a pulse driving circuit, a resonant capacitor, a coil, a controller and a transformer, wherein the direct-current power source outputs a direct-current voltage to the pulse driving circuit, and the pulse driving circuit drives the input direct-current voltage to output pulse voltage signals according to control signals of the controller; the resonant capacitor is connected with the primary terminal of the transformer so as to form a resonant loop; the secondary terminal of the transformer is connected with the coil, and the secondary terminal of the transformer is used for outputting an alternating power source so as to drive the coil to generate an alternating magnetic field. Due to the separation of the transformer, when the electric inductance is changed as the material of a pot is changed or the pot is lifted, resonant frequency cannot be changed, so that the condition that devices are damaged due to the sudden current increase of the pulse driving circuit can be avoided.
Description
Technical field
The invention belongs to electromagnetic equipment field, particularly relate to a kind of electromagnetic oven and the Poewr control method thereof that emulate naked light.
Background technology
Traditional commercial kitchen tools, are generally combustion gas, oil range, are directly passed to bottom pan by heat by naked light, make pan by heat transmission heating food materials.In use open firing process, its efficiency of heating surface is not high, and can produce pernicious gas in combustion, in use easily occurs gas-cooker gas leak phenomenon yet, the perils such as easy appearance is poisoning, blast.
For overcoming the above-mentioned defect of traditional kitchen tools, by using the electromagnetic oven heating flames of anger of Electromagnetic Heating, the efficiency of heating surface is higher, and there will not be gas leakage accident, effectively raises the security of use.
But, when using electromagnetic oven to heat, because in LC resonance circuit, resonant inductance is made up of jointly pan and drum, the inductance value of L is along with the position of pan, the material of pan, the temperature of pan and changing, and the material of such as pan may be the pan etc. of iron pan, copper pot, aluminum pot or composite.When the change of described resonant inductance makes driving frequency perception district or the arrival resonance region, capacitive district of electromagnetic oven, the electric current of driving switch pipe can be made to uprush and damage device.
Summary of the invention
The object of the present invention is to provide a kind of electromagnetic oven and the Poewr control method thereof that emulate naked light, to solve prior art when the change of resonant inductance makes driving frequency perception district or the arrival resonance region, capacitive district of electromagnetic oven, the electric current of driving switch pipe can be made to uprush and damage the problem of device.
The present invention is achieved in that a kind of electromagnetic oven emulating naked light, and described electromagnetic oven comprises dc source, pulse driving circuit, resonant capacitance, drum, controller, and described electromagnetic oven also comprises transformer, wherein:
The output of described dc source is connected with the input of described pulse driving circuit, the control end of described pulse driving circuit is connected with described controller, described dc source exports DC voltage to described pulse driving circuit, described pulse driving circuit according to the control signal of described controller, by input direct voltage drive voltage pulse output signal;
Described resonant capacitance is connected with the primary side of described transformer and forms resonant tank, and the output of described pulse driving circuit is connected with described resonant tank;
The secondary line end of described transformer is connected with described drum, exports alternating source drive described drum to produce alternating magnetic field by the secondary end of described transformer.
Another object of the present invention is to the Poewr control method providing a kind of electromagnetic oven based on above-mentioned emulation naked light, it is characterized in that, described method comprises:
Controller transmitted power adjustment instruction, the pulse voltage controlling described pulse driving circuit according to described power adjustment instruction exports;
The resonant frequency of the resonant tank formed according to primary side and the resonant capacitance of described transformer and described pulse voltage, obtain the input power of described primary end;
According to the input power of the primary side of described transformer, the output loop of described transformer adjusts the electric current of described load circuit accordingly.
In the present invention, the DC voltage that dc source exports produces pulse voltage through pulse driving circuit, through the resonant tank that the primary side of resonant capacitance and described transformer is formed, export with frequency alternating source at the secondary end of described transformer, alternating magnetic field is produced, the pan of heat effect on electromagnetic oven by described drum.Due to the isolation of transformer, when the change of pan material, or cause when pan throws pot the change of inductance time, resonant frequency can not be made to change, thus the electric current of pulse driving circuit can be avoided to uprush and damage device.
Accompanying drawing explanation
Fig. 1 is the structural representation of the electromagnetic oven of the emulation naked light that the embodiment of the present invention provides;
Fig. 2 is a kind of concrete structure schematic diagram of the electromagnetic oven of the emulation naked light that the embodiment of the present invention provides;
Fig. 3 is the another concrete structure schematic diagram of the electromagnetic oven of the emulation naked light that the embodiment of the present invention provides;
The schematic flow sheet of the Poewr control method of the electromagnetic oven of the emulation naked light that Fig. 4 provides for the embodiment of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The electromagnetic oven of naked light is emulated described in the embodiment of the present invention, the material being mainly used in solving due to pan in prior art is numerous, when adapting to different pan materials, the resonant frequency of the resonance circuit of traditional electromagnetic oven can be made to change, thus pulse driving circuit can be made to adjust the output frequency of pulse signal, follow resonant frequency change, when resonant frequency is by perception or arrival resonance region, capacitive district, the current value in pulse driving circuit can be made to uprush, cause the electric current in dc source and pulse driving circuit excessive and damage the problem of element.
And further object of the present invention be to overcome in prior art use electromagnetic oven carry out throwing pot time, when pan is raised, the reactance of pan and drum increases, LC resonant frequency raises, for ensureing that pulse driving circuit does not cause electric current to uprush because of pan change, the driving frequency of pulsation drive circuit also follows pan change.Under same loading condition, when driving frequency increases, power output also step-down thereupon, makes power when throwing pot also reduce, and can not meet the requirement of culinary art to temperature.
For solving subject matter of the present invention, the invention provides a kind of electromagnetic oven emulating naked light, described electromagnetic oven comprises dc source, pulse driving circuit, resonant capacitance, drum, controller, and described electromagnetic oven also comprises transformer, wherein:
The output of described dc source is connected with the input of described pulse driving circuit, the control end of described pulse driving circuit is connected with described controller, described dc source exports DC voltage to described pulse driving circuit, described pulse driving circuit according to the control signal of described controller, by input direct voltage drive voltage pulse output signal;
Described resonant capacitance is connected with the primary side of described transformer and forms resonant tank, and the output of described pulse driving circuit is connected with described resonant tank;
The secondary line end of described transformer is connected with described drum, exports alternating source drive described drum to produce alternating magnetic field by the secondary end of described transformer.
For solving the further problem of the present invention, the present invention is on the basis of above-mentioned electromagnetic oven, the described electromagnetic oven provided further also comprises the current transformer for measuring described transformer secondary output end electric current, the output of described current transformer is connected with described controller, and controller controls the power output of described pulse driving circuit according to the current signal that described current transformer detects.
Be specifically described below in conjunction with accompanying drawing.
Fig. 1 shows the structured flowchart of the electromagnetic oven of the emulation naked light that the embodiment of the present invention provides, and details are as follows:
Emulate the electromagnetic oven of naked light described in the embodiment of the present invention, comprise dc source 101, pulse driving circuit 102, resonant capacitance 103, drum 104, controller 105, described electromagnetic oven also comprises transformer 106, wherein:
The output of described dc source 101 is connected with the input of described pulse driving circuit 102, the control end of described pulse driving circuit 102 is connected with described controller 105, described dc source 101 exports DC voltage to described pulse driving circuit 102, described pulse driving circuit 102 according to the control signal of described controller 105, by input direct voltage drive voltage pulse output signal;
Described resonant capacitance 103 is connected with the primary side of described transformer 106 and forms resonant tank, and the output of described pulse driving circuit 102 is connected with described resonant tank;
The secondary line end of described transformer 106 is connected with described drum 104, exports alternating source drive described drum 104 to produce alternating magnetic field by the secondary end of described transformer 106.
Concrete, described dc source 101, according to the application scenarios of electromagnetic oven, can be the DC power supply of directly access, also can for the alternating voltage of civil power being converted to the power supply of DC voltage.Concrete, described power supply can be linear power supply, Switching Power Supply etc.Due to less demanding in use to power supply noise of electromagnetic oven, and power output is larger, generally selects linear power supply can meet the requirement of voltage transformation preferably.
Be illustrated in figure 2 the further line construction schematic diagram of electromagnetic oven described in the embodiment of the present invention, wherein, described dc source 101 comprises rectification circuit and filter circuit, the input of described rectification circuit is connected with AC power, the output of described rectification circuit is connected with described filter circuit, it is DC ripple voltage that described rectification circuit is used for the ac voltage rectifier of input, and it is DC voltage that described filter circuit is used for described DC ripple voltage filter.
Described rectification circuit, convert the DC voltage of unidirectional pulsating nature to for just alternating voltage, rectification circuit forms primarily of commutation diode, and common rectification circuit includes half-wave rectifying circuit, full-wave rectifying circuit and bridge rectifier three kinds.
Wherein, when the frequency of input AC civil power is 50Hz, the voltage that half-wave rectifying circuit exports only has half cycle, so this unidirectional pulsating nature direct current main component remains 50Hz's, half-wave rectifying circuit eliminates the half cycle of alternating current, does not change the frequency of alternating component in unidirectional pulsating nature direct current; All-wave is identical with bridge rectifier, use the positive and negative half cycle of input ac voltage, frequency is expanded to be twice as 100Hz, so the galvanic alternating component main component of this unidirectional pulsating nature is 100Hz, this is because input ac voltage half cycle be converted polarity by rectification circuit, the frequency of the DC pulse voltage of output is doubled than input ac voltage, and the raising of this frequency is conducive to the filtering of filter circuit.
Described filter circuit, can be made up of filter capacitor, also can be made up of filter inductance, the hybrid filter IC that certainly can also form according to electric capacity and inductance.
Concrete, described pulse driving circuit 102, is connected with described controller, for frequency or the phase place of the pulse voltage of the pulse-output instruction adjustment output according to controller.Such as, described pulse driving circuit can for being illustrated in figure 2 the bridge-type pulse driving circuit of four controlled tr tubes composition, as shown in Figure 2, described controlled tr tube is respectively T1, T2, T3, T4, and in the first period, T1 and T4 closes, T2, T3 disconnect, output voltage u0=Ud; When switch T1, T4 disconnect, T2, T3 are closed: u0=-Ud; When replacing change-over switch T1, T4 and T2, T3 with frequency f, then on load resistance R, obtain alternating voltage waveform (the positive and negative square wave replaced), its cycle T=1/f, like this, just becomes pulse voltage uo by DC voltage E.
Certainly, being not limited to bridge-type pulsed driving voltage, the pulse driving circuit etc. as used single switching transistor to drive can also being comprised.
Pulse driving circuit shown in Fig. 2, preferred embodiment, described controlled tr tube is IGBT insulated gate bipolar transistor or metal-oxide-semiconductor.Driving power due to IGBT insulated gate bipolar transistor is little and saturation pressure reduces, and is applicable to very much being applied to the higher converter system of DC voltage.
Described resonant capacitance, for forming resonant tank with resonant inductance, described resonant tank comprises series resonant tank as shown in Figure 2 and shunt-resonant circuit as shown in Figure 3, wherein, described resonant inductance is the primary side of transformer, is a fixed value, therefore, electromagnetic oven described in the embodiment of the present invention, its resonant frequency can't be subject to the change of pan material, or pan can not cause resonant inductance to change when throwing pot operation.
Concrete, described drum 104, for producing alternating magnetic field according to alternating current, enables pan heat.Thus be heat energy by electric energy conversion.
Described controller is for the phase place of the frequency and output voltage that control the output voltage of described pulse driving circuit, thus the power of adjustment electromagnetic oven.Because resonant frequency of the present invention can not change, thus do not need the change according to resonant frequency and change accordingly, can avoid entering resonance region and situation that generation current is uprushed at the output frequency of adjustment pulsation drive circuit, avoid damaging element, thus be conducive to the service life of improving electromagnetic oven.
In further embodiment, for realizing the change to the power output caused when throwing pot operation or change pan material in the present invention, electromagnetic oven of the present invention also comprises the current transformer for measuring described transformer secondary output end electric current, the output of described current transformer is connected with described controller, and controller controls the power output of described pulse driving circuit according to the current signal that described current transformer detects.
As shown in Figure 3, current transformer K is provided with in the output loop of the secondary end of transformer, described current transformer detects the current value of load circuit, and the current value of detection is sent to described controller, is judged the change of the current value of load circuit by controller.
When pan is raised, the reactance of drum and pan increases, transformer secondary output end output current reduces, the current value that current transformer K detects feeds back to controller, comparatively, quick adjustment controlled tr tube, as the driving frequency of IGBT for the current value of the more described detection of controller and current value ratio corresponding to current power, power stability when ensureing to throw pot, thus effective realization throws effectively carrying out of pot operation.
Fig. 4 shows the realization flow of the Poewr control method of the electromagnetic oven of the emulation naked light that the embodiment of the present invention provides, Poewr control method described in the embodiment of the present invention is based on the electromagnetic oven of the emulation naked light described in Fig. 1 to Fig. 3, and details are as follows for the Poewr control method of the electromagnetic oven of emulation naked light of the present invention:
In step S401, controller transmitted power adjustment instruction, the pulse voltage controlling described pulse driving circuit according to described power adjustment instruction exports.
Concrete, described controller transmitted power adjustment instruction step can comprise:
The current value of the described transformer secondary output end loop that described controller received current transformer detects;
When the current value of described transformer secondary output end loop is less than current value corresponding to described electromagnetic oven setting power, described controller transmitted power adjustment instruction.
In step S402, the resonant frequency of the resonant tank formed according to primary side and the resonant capacitance of described transformer and described pulse voltage, obtain the input power of described primary end.
In step S403, according to the input power of the primary side of described transformer, the output loop of described transformer adjusts the electric current of described load circuit accordingly.
Corresponding to the electromagnetic oven of the emulation naked light shown in Fig. 1-Fig. 3, the Poewr control method of the electromagnetic oven of emulation naked light of the present invention, can not affect resonant frequency because of the change of the material of pan or throwing pot to the change of the reactance of drum.Thus the output frequency by adjusting pulse driving circuit is not needed to adapt to resonant frequency yet.Thus the output frequency of pulse driving circuit can be avoided to enter resonance region generation current uprush to the damage of device.
And as detecting the electric current of transformer secondary output end especially by current transformer, and when the current value detected is less than current value corresponding to described electromagnetic oven setting power, described controller transmitted power adjustment instruction.Such as detect that the current value of transformer secondary output end is 9A, and the current value corresponding to power of current electromagnetic stove setting is 10A, now, controller adjusts pulse frequency and the conducting width of the output of described pulse driving circuit, thus the power that electromagnetic oven is exported maintains balance.
Preferably, in embodiments of the present invention, described pulse driving circuit is the bridge-type pulse driving circuit of four controlled tr tube compositions, and described method also comprises:
Temperature sensor detects the temperature value of the controlled tr tube of described pulse driving circuit;
The T1 when the temperature value of described controlled tr tube is greater than the first temperature value, controller controls to open radiator fan;
The T2 when the temperature of described controlled tr tube is greater than the second temperature value, controller reduces the power output of described controlled tr tube step by step;
When the temperature of described controlled tr tube is greater than the 3rd temperature value T3, controller controls described controlled tr tube and cuts out, or can also send alarm;
Wherein, T1<T2<T3, by the gradual control of temperature, thus effectively protects controlled tr tube.
In addition, correspondingly, in order to prevent boilers from drying burning situation from occurring, described in the embodiment of the present invention, method also comprises:
Temperature sensor detects the temperature value being positioned at the pan of described electromagnetic oven;
The T4 when the temperature value of described pan is greater than the 4th temperature value, controller controls to open radiator fan;
The T5 when the temperature of described pan is greater than the 5th temperature value, controller reduces the power output of described controlled tr tube step by step;
When the temperature of described pan is greater than the 6th temperature value T6, controller controls described controlled tr tube and cuts out, or can also send alarm;
Wherein, T4<T5<T6.
In addition, in the Poewr control method described in the embodiment of the present invention, in start and other power adjustment procedure, the power of described controller control electromagnetic oven is ascending progressively to be improved, or descendingly progressively to reduce, thus effectively can reduce the impact of starting resistor to electrical network.
And; voltage sampling can also be set at resonant tank; detect the tank voltage value of the primary side of transformer, when moment circuit abnormality, when magnitude of voltage is higher than maximum set value; voltage protection circuit closes impulse generator; stop controlled tr tube IGBT work, when after this voltage drop, pulse driving circuit is soft start again; recover IGBT work, effectively prevent IGBT excessive pressure damages.
Further, sampling can also be carried out to resonant tank current and detect resonant tank whether overcurrent, when moment circuit abnormality, current value, higher than maximum threshold values, closes impulse generator, stops IGBT work, when after this voltage drop, impulse generator is soft start again, recovers IGBT work.Effectively prevent IGBT overcurrent damage.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. emulate an electromagnetic oven for naked light, described electromagnetic oven comprises dc source, pulse driving circuit, resonant capacitance, drum, controller, it is characterized in that, described electromagnetic oven also comprises transformer, wherein:
The output of described dc source is connected with the input of described pulse driving circuit, the control end of described pulse driving circuit is connected with described controller, described dc source exports DC voltage to described pulse driving circuit, described pulse driving circuit according to the control signal of described controller, by input direct voltage drive voltage pulse output signal;
Described resonant capacitance is connected with the primary side of described transformer and forms resonant tank, and the output of described pulse driving circuit is connected with described resonant tank;
The secondary line end of described transformer is connected with described drum, exports alternating source drive described drum to produce alternating magnetic field by the secondary end of described transformer.
2. emulate the electromagnetic oven of naked light according to claim 1, it is characterized in that, described electromagnetic oven also comprises the current transformer for measuring described transformer secondary output end electric current, the output of described current transformer is connected with described controller, and controller controls the power output of described pulse driving circuit according to the current signal that described current transformer detects.
3. according to claim 1 or 2, emulate the electromagnetic oven of naked light, it is characterized in that, described dc source comprises rectification circuit, filter circuit, the input of described rectification circuit is connected with AC power, the output of described rectification circuit is connected with described filter circuit, it is DC ripple voltage that described rectification circuit is used for the ac voltage rectifier of input, and it is DC voltage that described filter circuit is used for described DC ripple voltage filter.
4. emulate the electromagnetic oven of naked light according to claim 1, it is characterized in that, described pulse driving circuit is the bridge-type pulse driving circuit of four controlled tr tube compositions.
5. emulate the electromagnetic oven of naked light according to claim 3, it is characterized in that, described controlled tr tube is IGBT insulated gate bipolar transistor or metal-oxide-semiconductor.
6. emulate the electromagnetic oven of naked light according to claim 1, it is characterized in that, described resonant capacitance is connected with the primary side of described transformer and forms resonant tank and comprise:
Described resonant capacitance is connected with the primary side of described transformer and forms shunt-resonant circuit, or
Described resonant capacitance is connected with the primary side of described transformer and forms Lv Lian resonant tank.
7. based on the Poewr control method emulating the electromagnetic oven of naked light described in any one of claim 1-7, it is characterized in that, described method comprises:
Controller transmitted power adjustment instruction, the pulse voltage controlling described pulse driving circuit according to described power adjustment instruction exports;
The resonant frequency of the resonant tank formed according to primary side and the resonant capacitance of described transformer and described pulse voltage, obtain the input power of described primary end;
According to the input power of the primary side of described transformer, the output loop of described transformer adjusts the electric current of described load circuit accordingly.
8. method according to claim 7, is characterized in that, described controller transmitted power adjustment instruction step comprises:
The current value of the described transformer secondary output end loop that described controller received current transformer detects;
When the current value of described transformer secondary output end loop is less than current value corresponding to described electromagnetic oven setting power, described controller transmitted power adjustment instruction.
9. method according to claim 7, is characterized in that, described pulse driving circuit is the bridge-type pulse driving circuit of four controlled tr tubes compositions, and described method also comprises:
Temperature sensor detects the temperature value of the controlled tr tube of described pulse driving circuit;
The T1 when the temperature value of described controlled tr tube is greater than the first temperature value, controller controls to open radiator fan;
The T2 when the temperature of described controlled tr tube is greater than the second temperature value, controller reduces the power output of described controlled tr tube step by step;
When the temperature of described controlled tr tube is greater than the 3rd temperature value T3, controller controls described controlled tr tube and cuts out;
Wherein, T1<T2<T3.
10. method according to claim 7, it is characterized in that, described method also comprises:
Temperature sensor detects the temperature value being positioned at the pan of described electromagnetic oven;
The T4 when the temperature value of described pan is greater than the 4th temperature value, controller controls to open radiator fan;
The T5 when the temperature of described pan is greater than the 5th temperature value, controller reduces the power output of described controlled tr tube step by step;
When the temperature of described pan is greater than the 6th temperature value T6, controller controls described controlled tr tube and cuts out;
Wherein, T4<T5<T6.
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| CN106235617A (en) * | 2016-08-20 | 2016-12-21 | 深圳市石代科技有限公司 | A kind of Electromgnetic seat heating desktop |
| CN106488600A (en) * | 2015-08-25 | 2017-03-08 | 比亚迪股份有限公司 | Electromagnetic heater and its heating control circuit and control method |
| CN108731040A (en) * | 2017-04-14 | 2018-11-02 | 佛山市顺德区美的电热电器制造有限公司 | The control method and device of electromagnetic heating cookware |
| CN111203163A (en) * | 2018-11-22 | 2020-05-29 | 弗拉迪米尔·尤尔维奇·库库什金 | Method and apparatus for liquid treatment using alternating electromagnetic field |
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| CN111770596A (en) * | 2019-04-01 | 2020-10-13 | 无锡物华电子科技有限公司 | Electromagnetic oven for heating aluminum pot |
| CN111947191A (en) * | 2020-08-31 | 2020-11-17 | 盘锦京联石油技术有限公司 | Electromagnetic stir-frying stove simulating open fire and control method |
| CN114158149A (en) * | 2021-12-22 | 2022-03-08 | 深圳拓邦股份有限公司 | Method and device for estimating power of induction cooker, induction cooker and storage medium |
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