CN102339085A - Measuring and controlling device for electromagnetic power device - Google Patents
Measuring and controlling device for electromagnetic power device Download PDFInfo
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- CN102339085A CN102339085A CN2011101403294A CN201110140329A CN102339085A CN 102339085 A CN102339085 A CN 102339085A CN 2011101403294 A CN2011101403294 A CN 2011101403294A CN 201110140329 A CN201110140329 A CN 201110140329A CN 102339085 A CN102339085 A CN 102339085A
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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 electromagnetic power equipment.
Background technology
In present electromagnetic induction heating product, the control of power and the 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 handled.And in the present most electromagnetism heating products, the sampling mode of electric current is had two kinds: a kind of is exactly to take out back rectification sampling to signal through current transformer, and not a kind of is exactly to take out signal again through constantan wire after amplifier amplifies, to take a sample.Though these two kinds of methods can both reach the requirement of current sampling, cost is higher relatively, on price, does not have advantage.
Summary of the invention
Technical matters to be solved by this invention provides a kind of realization that can be convenient and simple and simultaneously the power of current surveillance and electromagnetic power equipment is controlled.
To this, the present invention provides a kind of measure and control device of electromagnetic power equipment, comprising:
Power module is used to provide direct supply;
Resonance modules comprises: intercouple into the power coil resonant electric capacity in loop, be used for producing power output with the EMR electromagnetic resonance mode;
The current sample module is coupled with said power module and said resonance modules respectively, obtains the standby current signal;
Insulated gate bipolar transistor, its input end is coupled in drive signal, and its output terminal is coupled in resonance modules respectively, is used to control the power output of said resonance modules; And,
Control module, the standby current signal that said current sample module is gathered carries out analyzing and processing, with output drive signal to control said 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 with 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, because 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 was zero, this moment, magnetic field energy all was converted into electric energy, just formed pressure reduction at the resonant capacitance two ends, and the collector of IGBT reaches PV; Resonant capacitance discharges through power coil subsequently, and current phase is reverse, when electric capacity two ends pressure reduction is zero; When capacitor discharge was accomplished, electric energy all was converted into magnetic energy, and this moment, discharge current reached maximal value; Because induction reactance effect, electric current can not be reduced to zero immediately, so power coil two ends self-induction electromotive force is reverse; Because the existence of IGBT damper tube, resonant capacitance can not reverse charging, but discharges magnetic energy through damper tube.When the power coil open circuit, LC just can't constitute vibration, also can't produce self-induction electromotive force, does not just have self inductance current to exist.Reach the testing goal of detection power open coil simultaneously.
Compared with prior art, the invention has the advantages that satisfactory realization is controlled the power of current surveillance and electromagnetic power equipment simultaneously, and simple in structure, circuit is easy to realize that cost is also lower.
Preferably, said control module comprises:
AD conversion unit, being used for said standby current conversion of signals is digital signal corresponding;
Pwm unit is used for output drive signal to control said insulated gate bipolar transistor; And,
Data processing unit is handled accordingly the digital signal of said AD conversion unit output, and is controlled the output of said pwm unit.
Further, said data processing unit adopts single-chip microcomputer.
Preferably, the input end of said insulated gate bipolar transistor is connected with the 4th resistance with the 3rd resistance respectively, and the other end of said the 3rd resistance is connected with said drive signal, and the other end of said the 4th resistance is connected to ground level.
Preferably, said power module comprises: rectifier bridge, inductor rectifier and commutation capacitor; Civil power inserts the input end of said rectifier bridge, and the output terminal of said rectifier bridge connects an end of said inductor rectifier, and the said inductor rectifier other end connects an end of said commutation capacitor, and the other end of said commutation capacitor is connected to ground level.
Further, said current sample module comprises: first electric capacity, second electric capacity, first resistance, second resistance, the 5th resistance, first diode and second diode; One end of said first electric capacity connects said inductor rectifier and commutation capacitor respectively; Its other end connects the negative pole of first resistance, second resistance and first diode respectively, and the other end of said first resistance, second resistance is connected ground level respectively with the positive pole of first diode; The positive pole of said second diode connects ground level, and its negative pole connects said the 5th resistance and second electric capacity, and output standby current signal, and the other end of said the 5th resistance and second electric capacity is connected ground level respectively.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of measure and control device of electromagnetic power equipment of the present invention;
Fig. 2 is the current-voltage waveform synoptic diagram that middle A embodiment illustrated in fig. 1 is ordered;
Fig. 3 is a current processing process flow diagram embodiment illustrated in fig. 1;
Fig. 4 is power coil testing process figure embodiment illustrated in fig. 1.
Embodiment
Below in conjunction with accompanying drawing, more excellent embodiment of the present invention is done further detailed description:
The measure and control device of electromagnetic power equipment as shown in Figure 1 comprises:
Power module is used to provide direct supply;
Resonance modules comprises: intercouple into the power coil XL resonant capacitor C 4 in loop, be used for producing power output with the EMR electromagnetic resonance mode;
The current sample module is coupled with said power module and said resonance modules respectively, obtains the standby current signal;
Insulated gate bipolar transistor, its input end is coupled in drive signal, and its output terminal is coupled in resonance modules respectively, is used to control the power output of said resonance modules; And,
Control module, the standby current signal that said current sample module is gathered carries out analyzing and processing, with output drive signal to control said insulated gate bipolar transistor.
Wherein, said control module comprises:
AD conversion unit, being used for said standby current conversion of signals is digital signal corresponding;
Pwm unit is used for output drive signal to control said insulated gate bipolar transistor; And,
Data processing unit is handled accordingly the digital signal of said AD conversion unit output, and is controlled the output of said pwm unit.
Said data processing unit adopts single-chip microcomputer.
The input end of said insulated gate bipolar transistor is connected with the 4th resistance R 4 with the 3rd resistance R 3 respectively, and the other end of said the 3rd resistance R 3 is connected with said drive signal, and the other end of said the 4th resistance R 4 is connected to ground level.
Said power module comprises: rectifier bridge CB1, inductor rectifier L1 and commutation capacitor C3; Civil power inserts the input end of said rectifier bridge CB1, and the output terminal of said rectifier bridge CB1 connects the end of said inductor rectifier L1, and the said inductor rectifier L1 other end connects the end of said commutation capacitor C3, and the other end of said commutation capacitor C3 is connected to ground level.
Said current sample module comprises: first capacitor C 1, second capacitor C 2, first resistance R 1, second resistance R 2, the 5th resistance R 5, the first diode D1 and the second diode D2; One end of said first capacitor C 1 connects said inductor rectifier and commutation capacitor respectively; Its other end connects the negative pole of first resistance R 1, second resistance R 2 and the first diode D1 respectively, and said first resistance R 1, the other end of second resistance R 2 and the positive pole of the first diode D1 are connected ground level respectively; The positive pole of the said second diode D2 connects ground level, and its negative pole connects said the 5th resistance and second capacitor C 2, and output standby current signal, and the other end of said the 5th resistance R 5 and second capacitor C 2 is connected ground level respectively.
After the filtering of electric main through rectifier bridge CB1 rectification, inductance L 1 and capacitor C 3, be transformed into DC voltage to alternating voltage; Resonant capacitance C4 and power coil XL form the LC oscillation circuit; Resistance R 3, R4 and control Driver signal constitute the IGBT control circuit; Capacitor C 1, resistance R 1, R2 and diode D1, D2 constitute current sampling circuit, give single-chip microcomputer detecting the signal that A orders; Resistance R 5 constitutes the RC filtering circuit with electrochemical capacitor C2, filters out ripple.
Shown in Figure 2, be respectively the oscillogram of the electric current and the voltage that A is ordered of drive signal, power coil from top to bottom.Describe below in conjunction with its course of work.
When IGBT opened, to ground, owing to the usefulness of doing of coil induction reactance, electric current began to increase by zero electric current through 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 voltage of resonant capacitance C4 be the negative right side, a left side just, give capacitor C 4 chargings, and the linking to each other 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; Resonant capacitance C4 begins discharge then, and in discharge process, the voltage that A is ordered is almost constant; When the capacitor discharge completion, when C4 two ends pressure reduction was zero, this moment, power coil produced a self-induction electromotive force, and the voltage of capacitor C 4 is that a left side is just right negative, and self induction voltage is reduced to zero very soon through damper tube, and the voltage that A is ordered increases; 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 taking-up that A order, pass through the RC filtering of R5, C2 composition after, become a d. c. voltage signal and give single-chip microcomputer.Because voltage such as power that induced current forms are directly proportional, when power was big, it is big that the induced current of generation also becomes accordingly, and it is big that the voltage peak that A is ordered also just becomes, and it is big 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 through AD, obtains a current value I after handling through software filtering again, multiplies each other with current voltage U then, calculates current real power W=I*U.Get after the current power, compare with gear power, if greater than target power, that just reduces PWM; Otherwise then increase PWM, reach the purpose of power control.The concrete course of work is as shown in Figure 3.
As shown in Figure 2, when power coil is opened a way, owing to there is not the generation of 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 through this current signal.
The software processing method of detection power open coil: when opening like electromagnetic oven constant power equipment work; Earlier IGBT is sent out the enabling signal of 100ms, make the time of IGBT work 100ms, remove to detect voltage through single-chip processor i/o 1 then; If voltage is higher than setting value; The power scale coil is normal, if when being zero, judges the power coil open circuit.Its implementation is as shown in Figure 4.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (6)
1. the measure and control device of an electromagnetic power equipment is characterized in that, comprising:
Power module is used to provide direct supply;
Resonance modules comprises: intercouple into the power coil resonant electric capacity in loop, be used for producing power output with the EMR electromagnetic resonance mode;
The current sample module is coupled with said power module and said resonance modules respectively, obtains the standby current signal;
Insulated gate bipolar transistor, its input end is coupled in drive signal, and its output terminal is coupled in resonance modules respectively, is used to control the power output of said resonance modules; And,
Control module, the standby current signal that said current sample module is gathered carries out analyzing and processing, with output drive signal to control said insulated gate bipolar transistor.
2. the measure and control device of electromagnetic power equipment as claimed in claim 1 is characterized in that, said control module comprises:
AD conversion unit, being used for said standby current conversion of signals is digital signal corresponding;
Pwm unit is used for output drive signal to control said insulated gate bipolar transistor; And,
Data processing unit is handled accordingly the digital signal of said AD conversion unit output, and is controlled the output of said pwm unit.
3. the measure and control device of electromagnetic power equipment as claimed in claim 2 is characterized in that, said data processing unit adopts single-chip microcomputer.
4. like the measure and control device of claim 1,2 or 3 described electromagnetic power equipment; It is characterized in that; The input end of said insulated gate bipolar transistor is connected with the 4th resistance with the 3rd resistance respectively; The other end of said the 3rd resistance is connected with said drive signal, and the other end of said the 4th resistance is connected to ground level.
5. like the measure and control device of claim 1,2 or 3 described electromagnetic power equipment, it is characterized in that said power module comprises: rectifier bridge, inductor rectifier and commutation capacitor; Civil power inserts the input end of said rectifier bridge, and the output terminal of said rectifier bridge connects an end of said inductor rectifier, and the said inductor rectifier other end connects an end of said commutation capacitor, and the other end of said commutation capacitor is connected to ground level.
6. the measure and control device of electromagnetic power equipment as claimed in claim 5 is characterized in that, said current sample module comprises: first electric capacity, second electric capacity, first resistance, second resistance, the 5th resistance, first diode and second diode; One end of said first electric capacity connects said inductor rectifier and commutation capacitor respectively; Its other end connects the negative pole of first resistance, second resistance and first diode respectively, and the other end of said first resistance, second resistance is connected ground level respectively with the positive pole of first diode; The positive pole of said second diode connects ground level, and its negative pole connects said the 5th resistance and second electric capacity, and output standby current signal, and the other end of said the 5th resistance and second electric capacity is connected ground level respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN102339085A true CN102339085A (en) | 2012-02-01 |
| CN102339085B CN102339085B (en) | 2013-11-06 |
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Cited By (2)
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| CN103763803A (en) * | 2014-01-23 | 2014-04-30 | 美的集团股份有限公司 | Electromagnetic resonance control circuit, electromagnetic heating device and method for controlling 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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| 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 |
| CN109307796B (en) * | 2017-07-26 | 2024-08-13 | 佛山市顺德区美的电热电器制造有限公司 | Sampling current processing circuit, power detection circuit and electromagnetic cooking utensil |
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