CN102339085B - Measuring and controlling device for electromagnetic power device - Google Patents
Measuring and controlling device for electromagnetic power device Download PDFInfo
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- CN102339085B CN102339085B CN 201110140329 CN201110140329A CN102339085B CN 102339085 B CN102339085 B CN 102339085B CN 201110140329 CN201110140329 CN 201110140329 CN 201110140329 A CN201110140329 A CN 201110140329A CN 102339085 B CN102339085 B CN 102339085B
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Abstract
The invention relates to a measuring and controlling device for an electromagnetic power device. The measuring and controlling device comprises a power supply module, a resonance module, a current sampling module, an isolated gate bipolar transistor and a control module, wherein the power supply module is used for providing a direct current power supply; the resonance module comprises a power coil and a resonance capacitor which are coupled to form a loop and is used for generating power output in an electromagnetic resonance mode; the current sampling module is respectively coupled with the power supply module and the resonance module and is used for acquiring a monitoring current signal; the input end of the isolated gate bipolar transistor is coupled to a driving signal; the output end of the isolated gate bipolar transistor is respectively coupled to the resonance module and is used for controlling the power output of the resonance module; and the control module is used for analyzing and processing the acquired monitoring current signal so as to output the driving signal for controlling the isolated gate bipolar transistor.
Description
Technical field
The present invention relates to a kind of measure and control device of device for electromagnetic power.
Background technology
In present electromagnetic induction heating product, the control of power and adjustment or the technology of a key, this not only relates to the algorithm of software, and prior is exactly that the sampling of electric current and voltage signal is processed.And in present most Electromagnetic Heating product, the sampling mode of electric current is had two kinds: a kind of is exactly rectification sampling after by current transformer, signal being taken out, and not a kind of is exactly by constantan wire, signal to be taken out again to take a sample after amplifier amplifies.Although these two kinds of methods can reach the requirement of current sampling, cost is relatively high, there is no advantage on price.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of realization that can be convenient and simple and simultaneously the power of current surveillance and device for electromagnetic power is controlled.
To this, the invention provides a kind of measure and control device of device for electromagnetic power, comprising:
Power module is used for providing direct supply;
Resonance modules comprises: intercouple into power coil and the resonant capacitance in loop, be used for producing power stage in the electromagnetic resonance mode;
The current sample module is coupled with described power module and described resonance modules respectively, obtains the standby current signal;
Insulated gate bipolar transistor, its input end is coupled in the driving signal, and its output terminal is coupled in respectively resonance modules, is used for controlling the power stage of described resonance modules; And,
Control module, the standby current signal that described current sample module is gathered carries out analyzing and processing, with output drive signal to control described insulated gate bipolar transistor.
In the product of electromagnetic induction heating, the inductive load coil can constantly produce induced electromotive force and form induced current, and this induced current is directly proportional to output power in the LC oscillatory process.
Adopt technique scheme, according to above-mentioned principle, realization that can be easy is to the induced current processing of taking a sample, to reach the control to power.
Specifically, when insulated gate bipolar transistor (being IGBT) saturation conduction, to ground level, electric current increases by zero beginning is linear electric current by power module process power coil, IGBT, and when IGBT turn-offed, electric current was maximum at this moment, and the magnetic energy of power coil is maximum.And when IGBT turn-offed, due to the existence of power coil self-induction electromotive force, electric current can not be reduced to zero immediately, and current phase is constant, to the resonant capacitance charging, produced charging current.when charging current is zero, this moment, magnetic field energy all was converted into electric energy, just form pressure reduction at resonant capacitance two ends, the collector of IGBT reaches crest voltage, resonant capacitance discharges by power coil subsequently, current phase is reverse, when electric capacity two ends pressure reduction is zero, when capacitor discharge is completed, electric energy all is converted into magnetic energy, this moment, discharge current reached maximal value, due to the induction reactance effect, electric current can not be reduced to zero immediately, so power coil two ends self-induction electromotive force is reverse, existence due to the IGBT damper tube, resonant capacitance can not reverse charging, but by damper tube, magnetic energy is discharged.When the power coil open circuit, LC just can't consist of vibration, also can't produce self-induction electromotive force, just there is no self inductance current.Reach simultaneously the testing goal of detection power open coil.
Compared with prior art, the invention has the advantages that, satisfactory realization is controlled the power of current surveillance and device for electromagnetic power simultaneously, and simple in structure, and circuit is easy to realization, and cost is also lower.
Preferably, described control module comprises:
AD conversion unit is used for described standby current signal is converted to corresponding digital signal;
Pwm unit is used for output drive signal to control described insulated gate bipolar transistor; And,
Data processing unit is processed accordingly the digital signal of described AD conversion unit output, and is controlled the output of described pwm unit.
Further, described data processing unit adopts single-chip microcomputer.
Preferably, the input end of described insulated gate bipolar transistor is connected with the 4th resistance with the 3rd resistance respectively, and the other end of described the 3rd resistance is connected with described driving signal, and the other end of described the 4th resistance is connected to ground level.
Preferably, described power module comprises: rectifier bridge, inductor rectifier and commutation capacitor; The input end of the described rectifier bridge of civil power access, the output terminal of described rectifier bridge connects an end of described inductor rectifier, and the described inductor rectifier other end connects an end of described commutation capacitor, and the other end of described commutation capacitor is connected to ground level.
Further, described current sample module comprises: the first electric capacity, the second electric capacity, the first resistance, the second resistance, the 5th resistance, the first diode and the second diode; One end of described the first electric capacity connects respectively described inductor rectifier and commutation capacitor, its other end connects respectively the negative pole of the first resistance, the second resistance and the first diode, the other end of described the first resistance, the second resistance be connected the positive pole of diode and connect respectively ground level; The positive pole of described the second diode connects ground level, and its negative pole connects described the 5th resistance and second electric capacity, and output standby current signal, described the 5th resistance be connected the other end of electric capacity and connect respectively ground level.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of measure and control device of device for electromagnetic power of the present invention;
Fig. 2 is the current-voltage waveform schematic diagram that middle A embodiment illustrated in fig. 1 is ordered;
Fig. 3 is current processing process flow diagram embodiment illustrated in fig. 1;
Fig. 4 is power coil overhaul flow chart embodiment illustrated in fig. 1.
Embodiment
Below in conjunction with accompanying drawing, more excellent embodiment of the present invention is described in further detail:
The measure and control device of device for electromagnetic power as shown in Figure 1 comprises:
Power module is used for providing direct supply;
Resonance modules comprises: intercouple into power coil XL and the resonance capacitor C 4 in loop, be used for producing power stage in the electromagnetic resonance mode;
The current sample module is coupled with described power module and described resonance modules respectively, obtains the standby current signal;
Insulated gate bipolar transistor, its input end is coupled in the driving signal, and its output terminal is coupled in respectively resonance modules, is used for controlling the power stage of described resonance modules; And,
Control module, the standby current signal that described current sample module is gathered carries out analyzing and processing, with output drive signal to control described insulated gate bipolar transistor.
Wherein, described control module comprises:
AD conversion unit is used for described standby current signal is converted to corresponding digital signal;
Pwm unit is used for output drive signal to control described insulated gate bipolar transistor; And,
Data processing unit is processed accordingly the digital signal of described AD conversion unit output, and is controlled the output of described pwm unit.
Described data processing unit adopts single-chip microcomputer.
The input end of described insulated gate bipolar transistor is connected with the 4th resistance R 4 with the 3rd resistance R 3 respectively, and the other end of described the 3rd resistance R 3 is connected with described driving signal, and the other end of described the 4th resistance R 4 is connected to ground level.
Described power module comprises: rectifier bridge CB1, inductor rectifier L1 and commutation capacitor C3; The input end of the described rectifier bridge CB1 of civil power access, the output terminal of described rectifier bridge CB1 connects the end of described inductor rectifier L1, and the described inductor rectifier L1 other end connects the end of described commutation capacitor C3, and the other end of described commutation capacitor C3 is connected to ground level.
Described current sample module comprises: the first capacitor C 1, the second capacitor C 2, the first resistance R 1, the second resistance R 2, the 5th resistance R 5, the first diode D1 and the second diode D2; One end of described the first capacitor C 1 connects respectively described inductor rectifier and commutation capacitor, its other end connects respectively the negative pole of the first resistance R 1, the second resistance R 2 and the first diode D1, the other end of described the first resistance R 1, the second resistance R 2 be connected the positive pole of diode D1 and connect respectively ground level; The positive pole of described the second diode D2 connects ground level, and its negative pole connects described the 5th resistance and second capacitor C 2, and output standby current signal, described the 5th resistance R 5 be connected the other end of capacitor C 2 and connect respectively ground level.
After the filtering of electric main through rectifier bridge CB1 rectification, inductance L 1 and capacitor C 3, alternating voltage is transformed into DC voltage; Resonant capacitance C4 and power coil XL form the LC oscillation circuit; Resistance R 3, R4 and control Driver signal consist of the IGBT control circuit; Capacitor C 1, resistance R 1, R2 and diode D1, D2 consist of current sampling circuit, give single-chip microcomputer the signal that A orders being detected; Resistance R 5 and electrochemical capacitor C2 consist of the RC filtering circuit, and ripple is filtered out.
Shown in Figure 2, be respectively to drive signal, the electric current of power coil and the oscillogram of the voltage that A is ordered from top to bottom.Describe below in conjunction with its course of work.
When IGBT opened, to ground, due to the use of doing of coil induction reactance, electric current began to increase by zero electric current by inductance L 1, power coil XL and IGBT, and the voltage that this moment, A was ordered is almost nil; When IGBT turn-offed, power coil produced self-induction electromotive force, and electric current can not be zero immediately, the both end voltage of resonant capacitance C4 be the left negative right side just, give capacitor C 4 chargings, and being connected of capacitor C 1 and C4, the voltage that A is ordered begins rising over the ground; When self inductance current reduced zero, when magnetic energy all was converted into electric energy, the voltage that this moment, A was ordered reached the highest; Then resonant capacitance C4 begins discharge, and in discharge process, the voltage that A is ordered is almost constant; When capacitor discharge is completed, when C4 two ends pressure reduction was zero, this moment, power coil produced a self-induction electromotive force, and the both end voltage of capacitor C 4 be left positive right negative, and self induction voltage is reduced to zero very soon by damper tube, the voltage increase that A is ordered; When IGBT opens, capacitor C 1 discharge, the voltage that A is ordered is reduced to zero very soon.
In when work, IGBT open frequency be 20KHz to 40KHZ, the voltage signal cycle that A order and IGBT open Frequency Synchronization, after the signal that A order takes out, after passing through the RC filtering of R5, C2 composition, become a d. c. voltage signal and give single-chip microcomputer.The voltage such as the power that form due to induced current are directly proportional, and when power was large, it is large that the induced current of generation also becomes accordingly, and it is large that the voltage peak that A is ordered also just becomes, and it is large that the voltage signal of sampling also becomes; In like manner, during power reduction, the voltage signal of sampling also diminishes.
The signal that samples is transformed into single-chip microcomputer by AD, then obtains a current value I after processing through software filtering, then multiplies each other with current voltage U, calculates current real power W=I*U.After getting current power, then compare with gear power, if greater than target power, that just reduces PWM; Otherwise increase PWM, reach the purpose that power is controlled.The specific works process as shown in Figure 3.
As shown in Figure 2, when power coil is opened a way, due to the generation that there is no the power coil self-induction electromotive force, A point voltage almost nil and constant, after R5, C2 filtering, voltage signal is almost nil, and single-chip microcomputer just can come the detection power open coil by this current signal.
The software processing method of detection power open coil: when opening when working as electromagnetic oven constant power equipment, first IGBT is sent out the enabling signal of 100ms, make the time of IGBT work 100ms, then remove to detect voltage by single-chip processor i/o 1, if voltage is higher than setting value, the power scale coil is normal, if when being zero, and judgement power coil open circuit.Its implementation as shown in Figure 4.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. the measure and control device of a device for electromagnetic power, is characterized in that, comprising:
Power module is used for providing direct supply;
Resonance modules comprises: intercouple into power coil and the resonant capacitance in loop, be used for producing power stage in the electromagnetic resonance mode;
The current sample module is coupled with described power module and described resonance modules respectively, obtains the standby current signal;
Insulated gate bipolar transistor, its input end is coupled in the driving signal, and its output terminal is coupled in respectively resonance modules, is used for controlling the power stage of described resonance modules; And,
Control module, the standby current signal that described current sample module is gathered carries out analyzing and processing, with output drive signal to control described insulated gate bipolar transistor; The input end of described insulated gate bipolar transistor is connected with the 4th resistance with the 3rd resistance respectively, and the other end of described the 3rd resistance is connected with described driving signal, and the other end of described the 4th resistance is connected to ground level.
2. the measure and control device of device for electromagnetic power as claimed in claim 1, is characterized in that, described control module comprises:
AD conversion unit is used for described standby current signal is converted to corresponding digital signal;
Pwm unit is used for output drive signal to control described insulated gate bipolar transistor; And,
Data processing unit is processed accordingly the digital signal of described AD conversion unit output, and is controlled the output of described pwm unit.
3. the measure and control device of device for electromagnetic power as claimed in claim 2, is characterized in that, described data processing unit adopts single-chip microcomputer.
4. as the measure and control device of claim 1,2 or 3 described device for electromagnetic powers, it is characterized in that, described power module comprises: rectifier bridge, inductor rectifier and commutation capacitor; The input end of the described rectifier bridge of civil power access, the output terminal of described rectifier bridge connects an end of described inductor rectifier, and the described inductor rectifier other end connects an end of described commutation capacitor, and the other end of described commutation capacitor is connected to ground level.
5. the measure and control device of device for electromagnetic power as claimed in claim 4, is characterized in that, described current sample module comprises: the first electric capacity, the second electric capacity, the first resistance, the second resistance, the 5th resistance, the first diode and the second diode; One end of described the first electric capacity connects respectively described inductor rectifier and commutation capacitor, its other end connects respectively the negative pole of the first resistance, the second resistance and the first diode, the other end of described the first resistance, the second resistance be connected the positive pole of diode and connect respectively ground level; The positive pole of described the second diode connects ground level, and its negative pole connects described the 5th resistance and second electric capacity, and output standby current signal, described the 5th resistance be connected the other end of electric capacity and connect respectively ground level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110140329 CN102339085B (en) | 2011-05-27 | 2011-05-27 | Measuring and controlling device for electromagnetic power device |
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| CN 201110140329 CN102339085B (en) | 2011-05-27 | 2011-05-27 | Measuring and controlling device for electromagnetic power device |
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| CN102339085B true CN102339085B (en) | 2013-11-06 |
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| CN103763803B (en) * | 2014-01-23 | 2016-01-20 | 美的集团股份有限公司 | The control method of electromagnetic resonance control circuit, electromagnetic heater and transistor |
| CN109307796A (en) * | 2017-07-26 | 2019-02-05 | 佛山市顺德区美的电热电器制造有限公司 | Sample rate current processing circuit, power-sensing circuit and electromagnetic cooking appliance |
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| US7061779B2 (en) * | 2004-04-01 | 2006-06-13 | Entrust Power Co., Ltd. | Power factor correction circuit |
| EP1761832B1 (en) * | 2004-05-18 | 2008-11-19 | STMicroelectronics S.r.l. | Method and circuit for active power factor correction |
| JP2006067730A (en) * | 2004-08-27 | 2006-03-09 | Sanken Electric Co Ltd | Power factor improving circuit |
| CN201000584Y (en) * | 2006-11-03 | 2008-01-02 | 德力西集团仪器仪表有限公司 | Reactive power dynamic auto compensator |
| MY158596A (en) * | 2007-01-15 | 2016-10-31 | Oyl Res And Dev Ct Sdn Bhd | A power factor correction circuit |
| US8242754B2 (en) * | 2009-08-14 | 2012-08-14 | System General Corp. | Resonant power converter with half bridge and full bridge operations and method for control thereof |
| CN101702574B (en) * | 2009-10-22 | 2012-07-11 | 旭丽电子(广州)有限公司 | Power factor correcting controller and control method and applied power supply converter thereof |
| CN201805366U (en) * | 2010-08-27 | 2011-04-20 | 吕真 | Circuit for improving energy efficiency of electromagnetic oven and microwave oven |
| CN101976958B (en) * | 2010-11-10 | 2012-08-01 | 电子科技大学 | High-efficiency power regulating device based on power factor correction |
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