CN108289350A - Electromagnetic heating control method and electromagnetic heating apparatus - Google Patents
Electromagnetic heating control method and electromagnetic heating apparatus Download PDFInfo
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- CN108289350A CN108289350A CN201710014630.8A CN201710014630A CN108289350A CN 108289350 A CN108289350 A CN 108289350A CN 201710014630 A CN201710014630 A CN 201710014630A CN 108289350 A CN108289350 A CN 108289350A
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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
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Abstract
The invention discloses a kind of electromagnetic heating control method and electromagnetic heating apparatus, the electromagnetic heating control method includes the following steps：Electromagnetic heating apparatus during heating, obtains the drain voltage of IGBT pipes and the actual power of the electromagnetic heating apparatus；According to the actual power of the drain voltage of acquired IGBT pipes and the electromagnetic heating apparatus, adjust the IGBT pipes opens the object time；Current according to IGBT pipes opens the object time, controls the electromagnetic heating apparatus, so that the practical service time of IGBT approaches the current of IGBT pipes and opens the object time.Electromagnetic heating control method of the present invention can be effectively controlled the drain voltage of the IGBT in control circuit in electromagnetic heating apparatus, the excessively high phenomenon of drain voltage for IGBT occur be avoided, to be effectively improved electromagnetic heating apparatus reliability.
Description
Technical field
The present invention relates to electromagnetic heating apparatus fields more particularly to a kind of electromagnetic heating control method and electromagnetic heating to set
It is standby.
Background technology
In the prior art, when electromagnetic heating apparatus (such as electromagnetic oven) carries out high power heating, in control circuit
The drain voltage of IGBT is susceptible to higher phenomenon, and when the drain voltage of IGBT is excessively high, it will it seriously affects electromagnetism and adds
, there is security risk in the reliability of hot equipment.To solve the above-mentioned security hidden trouble of electromagnetic heating apparatus, existing skill
In art, a zero cross detection circuit, the master control core of electromagnetic heating apparatus are typically added in the control circuit of electromagnetic heating apparatus
Piece, to the testing result of the zero crossing of the drain voltage of IGBT, judges the drain voltage waveform of IGBT according to the zero cross detection circuit
Envelope the lowest point, then according to the lowest point calculate the time drain voltage of IGBT is controlled so that the drain voltage of IGBT
Peak value is no more than predetermined threshold value.But the control program of the drain voltage of the IGBT in the prior art, reliability be not high.
Invention content
The main purpose of the present invention is to provide a kind of electromagnetic heating control methods, it is intended to effectively control electromagnetic heating apparatus
The drain voltage of middle IGBT improves the reliability of electromagnetic heating apparatus.
To achieve the goals above, the present invention provides a kind of electromagnetic heating control method, the electromagnetic heating control method
Include the following steps：
S1, electromagnetic heating apparatus during heating, obtain the drain voltage of IGBT pipes and the electromagnetic heating apparatus
Actual power；
S2, according to the drain voltage of acquired IGBT pipes and the actual power of the electromagnetic heating apparatus, described in adjusting
IGBT pipes open the object time；
S3, the object time is opened according to the current of IGBT pipes, the electromagnetic heating apparatus is controlled, so that IGBT's actually opens
The logical time approaches the current of IGBT pipes and opens the object time.
Preferably, the drain voltage of the IGBT pipes is the voltage letter after being depressured to the drain voltage of the IGBT pipes
Number value.
Preferably, the step S2 includes：
S21, when the drain voltage of IGBT pipes be greater than or equal to current goal power under corresponding predetermined threshold value when, then reduce
The IGBT pipes open the object time；
S22, the actual power for comparing electromagnetic heating apparatus and current target power, and according to comparison result, adjust institute
That states IGBT pipes opens the object time.
Preferably, the step S2 further includes：
S23, when the drain voltage of IGBT pipes be less than current goal power under corresponding predetermined threshold value when, then follow the steps
S22。
Preferably, further include between step S2 and step S3：
S4, judge adjust after IGBT pipes open the object time whether be more than preset time range；It is described preset
Time range is the current point in time period residing in the harmonic period of IGBT pipes corresponding to open target time range；If
It is to then follow the steps S5；If it is not, thening follow the steps S3；
S5, by the maximum value or minimum value in preset time range, open the object time as IGBT pipes are new, and hold
Row step S3.
Preferably, further include before the step S4：
S41, it is opened when the drain voltage of the IGBT pipes is more than or equal to corresponding predetermined threshold value under current goal power
Beginning timing, and each harmonic period of the IGBT pipes is divided into some time；
S42, the harmonic period according to the IGBT pipes and current timing time determine that current point in time is managed in IGBT
Harmonic period in residing period.
Preferably, the step S3 includes：
S31, every preset time period, judge whether the practical service time of the IGBT pipes approaches working as the IGBT pipes
Before open the object time；
S32, when currently opening the object time of the IGBT pipes is not approached when the practical service time of the IGBT pipes, adjust
Save the practical service time of the IGBT pipes；
S33, it opens the object time, does not then do when the practical service time of the IGBT pipes approaches the current of the IGBT pipes
Processing.
In addition, to achieve the above object, the present invention also provides a kind of electromagnetic heating apparatus, the electromagnetic heating apparatus includes
Electromagnetic heating control circuit, the electromagnetic heating control circuit include electromagnetic heating circuit unit, reduction voltage circuit unit, voltage electricity
Sample circuit unit and main control chip are flowed, the electromagnetic heating unit includes IGBT pipes；Wherein：
The reduction voltage circuit unit, during heating for the electromagnetic heating apparatus, the drain electrode to the IGBT pipes
Voltage is depressured, and is the voltage signal values that the main control chip can identify by the drain voltage decompression of the IGBT pipes；
The voltage and current sample circuit unit, during heating for electromagnetic heating apparatus, to the electromagnetic heating
The input voltage and total current of control circuit are sampled；
The main control chip during heating for electromagnetic heating apparatus obtains the drain voltage of IGBT pipes, Yi Jigen
The input voltage arrived according to the voltage and current sample circuit unit sampling and the total current obtain the electromagnetic heating and set
Standby actual power；The drain voltage of the IGBT pipes is the voltage signal values after reduction voltage circuit unit decompression；Meanwhile
According to the actual power of the drain voltage of acquired IGBT pipes and the electromagnetic heating apparatus, the open-minded of the IGBT pipes is adjusted
Object time, and the object time is opened according to the current of IGBT pipes, the electromagnetic heating apparatus is controlled, so that IGBT's actually opens
The logical time approaches the current of IGBT pipes and opens the object time.
Preferably, the main control chip is specifically used for：
When the drain voltage of IGBT pipes is greater than or equal to corresponding predetermined threshold value under current goal power, then described in reduction
IGBT pipes open the object time；Compare the actual power of electromagnetic heating apparatus and preset target power, and is tied according to comparing
Fruit, adjust the IGBT pipes opens the object time.
Preferably, the main control chip is additionally operable to：
When the drain voltage of IGBT pipes is less than corresponding predetermined threshold value under current goal power, then compares electromagnetic heating and set
Standby actual power and preset target power, and according to comparison result, adjust the IGBT pipes opens the object time.
Preferably, the main control chip is additionally operable to：
Judge the IGBT pipes after adjusting opens whether the object time is more than preset time range；The preset time
The ranging from current point in time period residing in the harmonic period of IGBT pipes corresponding opens target time range；
If so, by maximum value or minimum value in preset time range, new as IGBT pipes opens the object time,
And the object time is opened according to the current of IGBT pipes, the electromagnetic heating apparatus is controlled, so that the practical service time of IGBT forces
The current of nearly IGBT pipes opens the object time；
If it is not, then opening the object time according to the current of IGBT pipes, the electromagnetic heating apparatus is controlled, so that the reality of IGBT
Border service time approaches the current of IGBT pipes and opens the object time；
Preferably, the main control chip is additionally operable to：
Start to count when the drain voltage of the IGBT pipes is more than or equal to corresponding predetermined threshold value under current goal power
When, and each harmonic period of the IGBT pipes is divided into some time；
According to the harmonic period of the IGBT pipes and current timing time, determine current point in time in the humorous of IGBT pipes
It shakes the residing period in the period.
Preferably, the main control chip is additionally operable to：
Every preset time period, judges whether the practical service time of the IGBT pipes approaches the current of the IGBT pipes and open
The logical object time；When currently opening the object time of the IGBT pipes is not approached when the practical service time of the IGBT pipes, is adjusted
Save the practical service time of the IGBT pipes；The current open-minded of the IGBT pipes is approached when the practical service time of the IGBT pipes
Object time is then not processed.
The present invention provides a kind of electromagnetic heating control method, and electromagnetic heating apparatus during heating, obtains IGBT pipes
The actual power of drain voltage and the electromagnetic heating apparatus；Added according to the drain voltage of acquired IGBT pipes and the electromagnetism
The actual power of hot equipment, adjust the IGBT pipes opens the object time；Current according to IGBT pipes is opened the object time, is controlled
The electromagnetic heating apparatus is made, so that the practical service time of IGBT approaches the current of IGBT pipes and opens the object time.The present invention
Electromagnetic heating control method can be effectively controlled the drain voltage of the IGBT in control circuit in electromagnetic heating apparatus,
The excessively high phenomenon of drain voltage for IGBT occur is avoided, to be effectively improved electromagnetic heating apparatus reliability.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the flow diagram of electromagnetic heating control method first embodiment of the present invention；
Fig. 2 is the flow diagram of electromagnetic heating control method second embodiment of the present invention；
Fig. 3 is the flow diagram of electromagnetic heating control method 3rd embodiment of the present invention；
Fig. 4 is the flow diagram of electromagnetic heating control method fourth embodiment of the present invention；
Fig. 5 is the flow diagram of the 5th embodiment of electromagnetic heating control method of the present invention；
Fig. 6 is the resonant voltage waveforms schematic diagram of IGBT pipes in one embodiment of electromagnetic heating control method of the present invention；
Fig. 7 is the electrical block diagram of electromagnetic heating control circuit in electromagnetic heating apparatus of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of electromagnetic heating control method, referring to Fig.1, in one embodiment, the electromagnetic heating controlling party
Method includes the following steps：
Step S1, during heating, the drain voltage and the electromagnetic heating for obtaining IGBT pipes are set electromagnetic heating apparatus
Standby actual power；
Electromagnetic heating control method provided in an embodiment of the present invention is mainly used in electromagnetic heating apparatus (such as electromagnetic oven)
In control system, the drain voltage for effectively controlling the IGBT in electromagnetic heating apparatus in control circuit, to avoid occur because
The drain voltage of IGBT is excessively high and influences the integrity problem of electromagnetic heating apparatus.
The present embodiment electromagnetic heating control method, in order to efficiently control the IGBT in electromagnetic heating apparatus in control circuit
Drain voltage, the present embodiment electromagnetic heating control method be first electromagnetic heating apparatus during heating, obtain IGBT pipe
Drain voltage and the electromagnetic heating apparatus actual power.It should be noted that in following embodiment, the IGBT pipes
Drain voltage be that (voltage signal after the decompression is for voltage signal values after being depressured to the drain voltage of the IGBT pipes
The identifiable small voltage signal of main control chip in electromagnetic heating apparatus).
Step S2 is adjusted according to the actual power of the drain voltage of acquired IGBT pipes and the electromagnetic heating apparatus
The IGBT pipes open the object time；
Specifically, the present embodiment electromagnetic heating control method is in the drain voltage and the electromagnetic heating for getting IGBT pipes
After the actual power of equipment, then according to the drain voltage of acquired IGBT pipes and the practical work(of the electromagnetic heating apparatus
Rate, adjust the IGBT pipes opens the object time.I.e. in the present embodiment, the object time of opening of the IGBT pipes is one dynamic
State value, the value are the variations of the actual power according to the variation and electromagnetic heating apparatus of the drain voltage of IGBT pipes and dynamic
Adjust gained.
Step S3, current according to IGBT pipes open the object time, the electromagnetic heating apparatus are controlled, so that the reality of IGBT
Border service time approaches the current of IGBT pipes and opens the object time.
In the present embodiment, according to the drain voltage of acquired IGBT pipes and the actual power of the electromagnetic heating apparatus
To opening after the object time is adjusted for the IGBT pipes, according to the current Caytoniales mark time of IGBT pipes, institute is controlled
The electric heating heating work of electromagnetic heating apparatus is stated, so that the reality of the IGBT in the electromagnetic heating apparatus in control circuit is open-minded
Time approaches the current of IGBT pipes and opens the object time.
Electromagnetic heating control method of the embodiment of the present invention, first, electromagnetic heating apparatus during heating, obtain IGBT pipes
Drain voltage and the electromagnetic heating apparatus actual power.Wherein, the drain voltage of the IGBT pipes is to the IGBT
The drain voltage of pipe be depressured after voltage signal values；Then, according to the drain voltage of acquired IGBT pipes and the electricity
The actual power of magnetic heating equipment, adjust the IGBT pipes opens the object time；Then, according to the current Caytoniales of IGBT pipes
The time is marked, the electromagnetic heating apparatus is controlled, so that the practical service time of IGBT pipes approaches the current of IGBT pipes and opens target
Time.Electromagnetic heating of embodiment of the present invention control method can be to the drain electrode of the IGBT pipes in control circuit in electromagnetic heating apparatus
Voltage is effectively controlled, and the excessively high phenomenon of drain voltage for IGBT pipes occur is avoided, to be effectively improved electromagnetism
Heating equipment reliability.
Further, with reference to Fig. 2, it is based on electromagnetic heating control method first embodiment of the present invention, is added in electromagnetism of the present invention
In heat control method second embodiment, above-mentioned steps S2 includes：
Step S21, when the drain voltage of IGBT pipes is greater than or equal to corresponding predetermined threshold value under current goal power, then
Reduce the IGBT pipes opens the object time；
Step S22 compares the actual power of electromagnetic heating apparatus and current target power, and according to comparison result, adjusts
That saves the IGBT pipes opens the object time；
Step S23 then executes step when the drain voltage of IGBT pipes is less than corresponding predetermined threshold value under current goal power
Rapid S22.
It is understood that in the present embodiment, electromagnetic heating apparatus all corresponding IGBT pipes under each target power
Drain voltage predetermined threshold value, it is current when electromagnetic oven for example, when the electromagnetic heating apparatus in the present embodiment is electromagnetic oven
When target power is 1950W, the predetermined threshold value that the drain voltage of IGBT pipes is corresponding when current goal power is 1950W is shown
1080V.Therefore, in the present embodiment, if the current goal power of electromagnetic oven is 1950W, when the drain electrode for detecting IGBT pipes
When voltage is greater than or equal to 1080V, need to reduce the IGBT pipes opens the object time.
Also, in the present embodiment, due to after reducing the practical service time of the IGBT pipes, the reality of electromagnetic heating apparatus
Border power also can and then reduce, therefore, in the present embodiment, in the case where the drain voltage of IGBT pipes is greater than or equal to current goal power
When corresponding predetermined threshold value, reduce the IGBT pipes open the object time after, it is also necessary to the reality of electromagnetic heating apparatus
Power is compared with current target power, and according to comparison result, adjust the IGBT pipes opens the object time.
Specifically, in the present embodiment, when the actual power of electromagnetic heating apparatus is less than current target power, then increase
The IGBT pipes open the object time；When the actual power of electromagnetic heating apparatus is more than current target power, then reduce
The IGBT pipes open the object time；It is when the actual power of electromagnetic heating apparatus is equal to current target power, then described
The object time of opening of IGBT pipes does not make any change.
In the present embodiment, when the drain voltage of GBT pipes is less than corresponding predetermined threshold value under current goal power, then compare
The actual power of electromagnetic heating apparatus and current target power, and according to comparison result, adjust the Caytoniales of the IGBT pipes
The time is marked, electromagnetic heating apparatus is made to carry out electromagnetic heating work according to current target power.
The present embodiment electromagnetic heating control method, when the drain voltage of IGBT pipes is right more than or equal under current goal power
When the predetermined threshold value answered, then reduce the IGBT pipes opens the object time；The object time is opened in the adjusting IGBT pipes
Later, compare the actual power of electromagnetic heating apparatus and current target power, and according to comparison result, adjust the IGBT pipes
Open the object time.The present embodiment corresponding default threshold in the case where the drain voltage of IGBT pipes is greater than or equal to current goal power
When value, reduce opening the object time for the IGBT pipes, and then efficiently control the drain voltage of IGBT pipes, avoids appearance
The excessively high phenomenon of the drain voltages of IGBT pipes, to be effectively improved electromagnetic heating apparatus reliability.
Further, with reference to Fig. 3, based on the second embodiment of electromagnetic heating control method of the present invention, in electromagnetism of the present invention
In method for heating and controlling 3rd embodiment, further include between above-mentioned steps S2 and above-mentioned steps S3：
S4, judge the IGBT pipes after adjusting opens whether the object time is more than preset time range；It is described preset
Time range is the current point in time period residing in the harmonic period of IGBT pipes corresponding to open target time range；If
It is to then follow the steps S5；If it is not, thening follow the steps S3；
S5 as IGBT pipes opening the object time newly, and holds the maximum value or minimum value in preset time range
Row step S3.
Specifically, in the present embodiment, the present embodiment electromagnetic heating control method opens the object time adjusting IGBT pipes
Later (i.e. after above-mentioned steps S2), when whether open the object time be more than preset of the IGBT pipes after adjusting needed to judge
Between range, the preset time range is corresponding to open the current point in time period residing in the harmonic period of IGBT pipes
Logical object time range.When determining when opening the object time more than preset time range of the IGBT pipes after adjusting, then will
Maximum value in preset time range or minimum value are opened the object time as IGBT pipes are new, and working as according to IGBT pipes
Before open the object time, the electromagnetic heating apparatus is controlled, so that the practical service time of IGBT pipes approaches the current of IGBT pipes
Open the object time；When determining when opening the object time and being less than preset time range of the IGBT pipes after adjusting, then press
Current according to IGBT pipes opens the object time, the electromagnetic heating apparatus is controlled, so that the practical service time of IGBT pipes approaches
The current of IGBT pipes opens the object time.The present embodiment electromagnetic heating control method can efficiently control the drain electrode electricity of IGBT pipes
Pressure avoids the excessively high phenomenon of drain voltage for IGBT pipes occur, to be effectively improved electromagnetic heating apparatus reliability.
Further, with reference to Fig. 4, based on the 3rd embodiment of electromagnetic heating control method of the present invention, in electromagnetism of the present invention
In method for heating and controlling fourth embodiment, further include before above-mentioned steps S4：
S41 is opened when the drain voltage of the IGBT pipes is more than or equal to corresponding predetermined threshold value under current goal power
Beginning timing, and each harmonic period of the IGBT pipes is divided into some time；
S42 determines that current point in time is managed in IGBT according to the harmonic period of the IGBT pipes and current timing time
Harmonic period in residing period.
Specifically, it in the present embodiment, is corresponded in the case where the drain voltage of the IGBT pipes is greater than or equal to current goal power
Moment of predetermined threshold value start timing, and each harmonic period of the IGBT pipes is divided into some time.It needs
Bright, the present embodiment is the drain voltage in the IGBT pipes more than or equal to corresponding predetermined threshold value under current goal power
Moment start timing, in other embodiments, can also be to start timing at other moment of the harmonic period, start to count
When at the time of be not fixed.Also, in the present embodiment, the power of the predetermined threshold value and electromagnetic heating apparatus is unrelated.
With reference to the resonant voltage waveforms signal that Fig. 6, Fig. 6 are IGBT pipes in one embodiment of electromagnetic heating control method of the present invention
Figure, as shown in fig. 6, each harmonic period in the resonant voltage waveforms of IGBT pipes is divided into four periods by the present embodiment,
Respectively 0-T1 periods, T1-T2 periods, T2-T3 periods and T3-T4 periods, then, according to the humorous of the IGBT pipes
Cycle T of shaking and current timing time t1 determine the current point in time period residing in the harmonic period of IGBT pipes.This
In embodiment, the harmonic period T of the IGBT pipes is 10ms.Also, in the present embodiment, above-mentioned timing node T1, T2, T3 and T4
Setting, can be configured according to actual needs, it is preferable that in the present embodiment, timing node T1 be 1/6T position, the time
Node T2 is the position of 2/6T, and timing node T3 is the position of 4/6T, and timing node T5 is the position of 5/6T, and each period
It is inside all corresponding respectively to open target time range there are one preset IGBT pipes.
For example, in the present embodiment, it, then can be according to the harmonic period T (T of the IGBT pipes when timing time is 23ms
=10ms) and current timing time t1 (t1=23ms), determine that current point in time is residing in the harmonic period of IGBT pipes
Period be Fig. 6 in the T1-T2 periods in, within the period, the object time of opening of the IGBT pipes after adjusting cannot
It is corresponding more than the period to open target time range.The object time of opening of IGBT pipes after adjusting is more than the period
Corresponding when opening target time range, then the maximum value or minimum value in preset time range is opened as IGBT pipes are new
The logical object time, and the object time is opened according to the current of IGBT pipes, the electromagnetic heating work of the electromagnetic heating apparatus is controlled,
So that the practical service time of IGBT pipes approaches the current of IGBT pipes and opens the object time.
Specifically, in the present embodiment, if the object time of opening of the IGBT pipes after adjusting corresponding opens more than the period
When the maximum value of logical object time range, then by the corresponding maximum value for opening target time range of the preset period, make
For IGBT pipes it is new open the object time；
If the object time of opening of the IGBT pipes after adjusting corresponding opens target time range most less than the period
When small value, then by the corresponding minimum value for opening target time range of the preset period, new Caytoniales is managed as IGBT
Mark the time.
If the object time of opening of IGBT pipes after adjusting is not above the period and corresponding opens target time range
When, then the object time is opened according to the current of IGBT pipes, the electromagnetic heating work of the electromagnetic heating apparatus is controlled, so that IGBT
The practical service time of pipe approaches the current of IGBT pipes and opens the object time.
Electromagnetic heating of embodiment of the present invention control method adjust IGBT pipes open the object time after, after judging adjusting
IGBT pipes open the object time whether be more than preset time range, the preset time range be current point in time exist
In the harmonic period of IGBT pipes the residing period it is corresponding open target time range, if the Caytoniales of the IGBT pipes after adjusting
It is more than preset time range to mark the time, then by the maximum value or minimum value in preset time range, newly as IGBT pipes
Open the object time.The present embodiment can efficiently control the drain voltage of IGBT pipes, avoid the drain electrode electricity for IGBT pipes occur
High phenomenon is pressed through, to be effectively improved electromagnetic heating apparatus reliability.
Further, with reference to Fig. 5, based on any implementation in electromagnetic heating control method the various embodiments described above of the present invention
Example, in the 5th embodiment of electromagnetic heating control method of the present invention, above-mentioned steps S3 includes：
S31, every preset time period, judge whether the practical service time of the IGBT pipes approaches working as the IGBT pipes
Before open the object time；
S32, when currently opening the object time of the IGBT pipes is not approached when the practical service time of the IGBT pipes, adjust
Save the practical service time of the IGBT pipes；
S33, it opens the object time, does not then do when the practical service time of the IGBT pipes approaches the current of the IGBT pipes
Processing.
Electromagnetic heating control method every preset time period of the embodiment of the present invention, judges when actually opening of the IGBT pipes
Between whether approach the current of the IGBT pipes and open the object time, when the practical service time of the IGBT pipes do not approach it is described
When currently opening the object time of IGBT pipes, adjusts the practical service time of the IGBT pipes, makes actually opening for the IGBT pipes
The logical time approaches the current of the IGBT pipes and opens the object time；The IGBT is approached when the practical service time of the IGBT pipes
The current of pipe is opened the object time, then is not processed.The present embodiment can efficiently control the drain voltage of IGBT pipes, avoid
There is the excessively high phenomenon of the drain voltage of IGBT pipes, to be effectively improved electromagnetic heating apparatus reliability.
The present invention also provides a kind of electromagnetic heating apparatus, and with reference to Fig. 7, in one embodiment, which includes
Electromagnetic heating control circuit, the electromagnetic heating control circuit include mains input 101, input protection circuit unit 102,
Current rectifying and wave filtering circuit unit 103, electromagnetic heating circuit unit 104, reduction voltage circuit unit 105, voltage and current sample circuit unit
106, drive circuit unit 107 and main control chip 108.
Specifically, in the present embodiment, the mains input 101 is the present embodiment electricity for inputting mains supply
Magnetic heating equipment is powered；
The input protection circuit unit 102, for carrying out overvoltage protection and overcurrent to the present embodiment electromagnetic heating apparatus
Protection；
The current rectifying and wave filtering circuit unit 103, the mains supply for being inputted to the mains input 101
Rectifying and wave-filtering is carried out, and the power supply after rectifying and wave-filtering is exported to the electromagnetic heating circuit unit 104, so that the electromagnetism adds
Heater circuit unit 104 by heating equipment (not shown) to carrying out electromagnetic heating；
The reduction voltage circuit unit 105 is depressured for the drain voltage to the IGBT pipes Q1；
The voltage and current sample circuit unit 106, it is (i.e. described for the input voltage to the electromagnetic heating control circuit
The line voltage that mains input 101 is inputted) and the total current of the electromagnetic heating control circuit sampled；
The drive circuit unit 107, for driving the electromagnetic heating of the electromagnetic heating circuit unit 104 to work；
The main control chip 108 during heating for electromagnetic heating apparatus obtains the drain voltage of IGBT pipes Q1,
And the line voltage sampled according to the voltage and current sample circuit unit and the total current, it obtains the electromagnetism and adds
The actual power of hot equipment；The drain voltage of the IGBT pipes Q1 is the voltage signal after reduction voltage circuit unit decompression
Value；Meanwhile according to the actual power of the drain voltage of acquired IGBT pipes Q1 and the electromagnetic heating apparatus, described in adjusting
IGBT pipes Q1's opens the object time, and opens the object time according to the current of IGBT pipes Q1, controls the electromagnetic heating apparatus,
So that the practical service time of IGBT approaches the current of IGBT pipes Q1 and opens the object time.
In the present embodiment, the input protection circuit unit 102 includes fuse FUSE, varistor R1 and filter capacitor
C1.Specifically, the fuse FUSE is series on the firewire input terminal ACL of the mains input 101；It is described pressure-sensitive
One end of resistance R1 is connect with the firewire input terminal ACL of the mains input 101, the other end of the varistor R1
It is connect with the zero curve input terminal ACN of the mains input 101；The filter capacitor C1 and varistor R1 is simultaneously
Connection.
In the present embodiment, the current rectifying and wave filtering circuit unit 103 includes rectifier bridge stack 1031, capacitance C2, capacitance C3 and electricity
Feel L1.Specifically, the first ac input end AC1 of the rectifier bridge stack 1031 is connect with the firewire input terminal ACL, described whole
Second ac input end AC2 of stream bridge heap 1031 is connect with the zero curve input terminal ACN, and the anode of the rectifier bridge stack 1031 is defeated
Outlet V+ is connect with the first end of the first end of the capacitance C2 and the inductance L1 respectively, the cathode of the rectifier bridge stack 1031
Output end V- is connect with the second end of the capacitance C2；The second segment of the inductance L1 is connect with the first end of the capacitance C3；
The second end of the capacitance C3 is grounded；It is also in series with and is used between the second end of the capacitance C2 and the second end of the capacitance C3
The sampling resistor R2 of current sample；In the present embodiment, the first end of the capacitance C3 also with the electromagnetic heating circuit unit 104
Connection, the second end of the capacitance C3 are also connected to ground.
In the present embodiment, the electromagnetic heating unit 104 is including coil panel L2, capacitance C4 and for controlling the coil
The current switching of disk L2 is to realize the IGBT pipes Q1 of electromagnetic heating.Specifically, the first end of the capacitance C4 respectively with the electricity
Hold the first end of C3 and the first end connection (the specific connection relation of the coil panel L2 not shown) of the coil panel L2, it is described
The second end of capacitance C4 is connect with the drain electrode of the second end of the coil panel L2 and the IGBT pipes Q1 respectively；The IGBT pipes Q1
Gate pole connect with the main control chip 108 through the drive circuit unit 107, the source electrode of IGBT pipes Q1 ground connection.
In the present embodiment, the input terminal of the reduction voltage circuit unit 105 is connect with the drain electrode of the IGBT pipes Q1, the drop
The output end of volt circuit unit 105 is connect with the main control chip；The input of the drive circuit unit 107 with the master control
Chip connects, and the output end of the drive circuit unit 107 is connect with the gate pole of the IGBT pipes Q1；The voltage and current sampling
First sampling input terminal of circuit unit 106 is connect with the firewire input terminal ACL, the voltage and current sample circuit unit
106 the second sampling input terminal is connect with one end of the sampling resistor R2.
In the present embodiment, the main control chip 108 needs to pass through institute before the drain voltage for obtaining the IGBT pipes Q1
It states reduction voltage circuit unit 105 to be depressured the drain voltage of the IGBT pipes Q1, the reduction voltage circuit unit 105 will be described
The drain voltage decompression of IGBT pipes Q1 is the voltage signal values that the main control chip 105 can identify.
In the present embodiment, the object time of opening of the IGBT pipes Q1 is a dynamic value, which is according to IGBT pipes Q1
Drain voltage variation and the electromagnetic heating apparatus actual power variation and dynamic regulation obtained by.
Also, in the present embodiment, the main control chip 105 according to IGBT pipes Q1 drain voltage and the electromagnetic heating
The actual power of equipment is opened to the IGBT pipes Q1's after the object time is adjusted, according to the current open-minded of IGBT pipes Q1
Object time controls the electric heating heating work of the electromagnetic heating apparatus, so that in the electromagnetic heating apparatus in control circuit
Practical service time of IGBT approach the current of IGBT pipes Q1 and open the object time.
Further, in this embodiment the main control chip 105 is specifically used for：When the drain voltage of IGBT pipes Q1 is more than
Or equal to when corresponding predetermined threshold value, then reduce the IGBT pipes Q1 opens the object time under current goal power；Then compare
Compared with the actual power of electromagnetic heating apparatus and current target power, and according to comparison result, adjust opening for the IGBT pipes Q1
The logical object time.
It is understood that in the present embodiment, electromagnetic heating apparatus all corresponding IGBT pipes under each target power
The predetermined threshold value of the drain voltage of Q1, for example, when the electromagnetic heating apparatus in the present embodiment is electromagnetic oven, when working as electromagnetic oven
When preceding target power is 1950W, the drain voltage of the IGBT pipes Q1 predetermined threshold value corresponding when current goal power is 1950W
Show 1080V.Therefore, in the present embodiment, if the current goal power of electromagnetic oven is 1950W, when detecting IGBT pipes Q1's
When drain voltage is greater than or equal to 1080V, what the main control chip 105 needed to reduce the IGBT pipes Q1 opens the object time.
Also, in the present embodiment, due to after reducing the practical service time of the IGBT pipes Q1, electromagnetic heating apparatus
Actual power also can and then reduce, and therefore, in the present embodiment, be greater than or equal to current goal work(in the drain voltage of IGBT pipes Q1
Under rate when corresponding predetermined threshold value, the main control chip 105 reduce the IGBT pipes Q1 open the object time after, also need
The actual power of electromagnetic heating apparatus is compared with current target power, and according to comparison result, described in adjusting
IGBT pipes Q1's opens the object time.
Specifically, in the present embodiment, when the actual power of electromagnetic heating apparatus is less than current target power, then increase
The IGBT pipes Q1's opens the object time；When the actual power of electromagnetic heating apparatus is more than current target power, then subtract
The small IGBT pipes Q1's opens the object time；When the actual power of electromagnetic heating apparatus is equal to current target power, then
The object time of opening of the IGBT pipes Q1 does not make any change.
Further, in this embodiment the main control chip 105 is additionally operable to：Work as when the drain voltage of IGBT pipes Q1 is less than
Under preceding target power when corresponding predetermined threshold value, then compare the actual power of electromagnetic heating apparatus and preset target power, and
According to comparison result, adjust the IGBT pipes Q1 opens the object time.
Specifically, the present embodiment electromagnetic heating control method, when the main control chip 105 determines the drain electrode electricity of GBT pipes
When pressure is less than corresponding predetermined threshold value under current goal power, then compare the actual power of electromagnetic heating apparatus and current target
Power, and according to comparison result, adjust the IGBT pipes Q1 opens the object time, makes electromagnetic heating apparatus according to current mesh
It marks power and carries out electromagnetic heating work.
Further, in this embodiment the main control chip 105 is additionally operable to：It is big in the drain voltage of the IGBT pipes Q1
In or equal to starting timing under current goal power when corresponding predetermined threshold value, and by each harmonic period of the IGBT pipes Q1
It is divided into some time；And the harmonic period according to the IGBT pipes Q1 and current timing time, when determining current
Between point period residing in the harmonic period of IGBT pipes Q1.
In the present embodiment, the main control chip 105 is additionally operable to：Judging the object time of opening of the IGBT pipes Q1 after adjusting is
No is more than preset time range；The preset time range is that current point in time is residing in the harmonic period of IGBT pipes Q1
Period corresponding open target time range；If so, by maximum value or minimum value in preset time range, as
IGBT pipes Q1 is new to be opened the object time, and opens the object time according to the current of IGBT pipes Q1, is controlled the electromagnetic heating and is set
It is standby so that the practical service time of IGBT approach the current of IGBT pipes Q1 and open the object time；If it is not, then according to IGBT pipes Q1's
The object time currently is opened, controls the electromagnetic heating apparatus, so that the practical service time of IGBT approaches working as IGBT pipes Q1
Before open the object time.
Specifically, in the present embodiment, the main control chip 105 is greater than or equal in the drain voltage of the IGBT pipes Q1 and works as
The moment of corresponding predetermined threshold value starts timing under preceding target power, and each harmonic period of the IGBT pipes Q1 is divided into
Some time is the resonant voltage waveforms of IGBT pipes in one embodiment of electromagnetic heating control method of the present invention with reference to Fig. 6, Fig. 6
Schematic diagram, as shown in fig. 6, when each harmonic period in the resonant voltage waveforms of IGBT pipes Q1 is divided into four by the present embodiment
Between section, respectively 0-T1 periods, the T1-T2 periods, T2-T3 periods and T3-T4 periods, then, according to the IGBT
The harmonic period T of pipe Q1 and current timing time t1 determines that current point in time is residing in the harmonic period of IGBT pipes Q1
Period.In the present embodiment, the harmonic period T of the IGBT pipes Q1 is 10ms.Also, in the present embodiment, segmentum intercalaris when above-mentioned
The setting of point T1, T2, T3 and T4, can be configured according to actual needs, it is preferable that in the present embodiment, timing node T1 is
The position of 1/6T, timing node T2 are the position of 2/6T, and timing node T3 is the position of 4/6T, and timing node T5 is the position of 5/6T
It sets, and is corresponded to respectively in each period and open target time range there are one preset IGBT pipes Q1.
The present embodiment electromagnetic heating apparatus adjust IGBT pipes Q1 open the object time after, need judge adjust after
IGBT pipes Q1's opens whether the object time is more than preset time range, and the preset time range, that is, current point in time exists
The residing period corresponding opens target time range in the harmonic period of IGBT pipes Q1.For example, when timing time is 23ms,
It can then be determined according to the harmonic period T (T=10ms) and current timing time t1 (t1=23ms) of the IGBT pipes Q1
The current point in time period residing in the harmonic period of IGBT pipes Q1 is in the T1-T2 periods in Fig. 6, in the period
Interior, the object time of opening of IGBT pipes Q1 after adjusting corresponding no more than the period opens target time range.Work as tune
IGBT pipes Q1 after section to open the object time corresponding more than the period when opening target time range, then preset time
Maximum value in range or minimum value, new as IGBT pipes Q1 opens the object time, and according to the current open-minded of IGBT pipes Q1
Object time controls the electromagnetic heating work of the electromagnetic heating apparatus, so that the practical service time of IGBT approaches IGBT pipes
The current of Q1 opens the object time.
Specifically, in the present embodiment, if adjust after IGBT pipes Q1 open the object time more than the period it is corresponding
When opening the maximum value of target time range, then by the corresponding maximum value for opening target time range of the preset period,
New as IGBT pipes Q1 opens the object time；If the object time of opening of the IGBT pipes Q1 after adjusting corresponds to less than the period
The minimum value for opening target time range when, then by the corresponding minimum for opening target time range of the preset period
Value, new as IGBT pipes Q1 opens the object time.If when the opening the object time and being not above this of IGBT pipes Q1 after adjusting
Between section is corresponding when opening target time range, then open the object time according to the current of IGBT pipes Q1, control the electromagnetism and add
The electromagnetic heating of hot equipment works, so that the practical service time of IGBT approaches the current of IGBT pipes Q1 and opens the object time.
Further, in this embodiment the main control chip 105 is additionally operable to：
Every preset time period, judges whether the practical service time of the IGBT pipes Q1 approaches working as the IGBT pipes Q1
Before open the object time；When currently opening target of the IGBT pipes Q1 is not approached when the practical service time of the IGBT pipes Q1
Between when, adjust the practical service time of the IGBT pipes Q1；The IGBT is approached when the practical service time of the IGBT pipes Q1
The current of pipe Q1 is opened the object time, then is not processed.
Electromagnetic heating apparatus of the embodiment of the present invention, first, electromagnetic heating apparatus during heating, the reduction voltage circuit
Unit 105 is depressured the drain voltage of the IGBT pipes Q1, is the master by the drain voltage decompression of the IGBT pipes Q1
The voltage signal values that control chip 108 can identify, meanwhile, the voltage and current sample circuit unit 106 is to the mains supply
The total current of the line voltage of input terminal 101 and the electromagnetic heating control circuit is sampled；Then, the main control chip
105 electromagnetic heating apparatus during heating, obtain through the reduction voltage circuit unit 105 decompression after IGBT pipes Q1 drain electrode
Voltage, and the line voltage sampled according to the voltage and current sample circuit unit and the total current, obtain the electricity
The actual power of magnetic heating equipment；Meanwhile the main control chip 105 is according to the drain voltage of acquired IGBT pipes Q1 and described
The actual power of electromagnetic heating apparatus adjusts opening the object time for the IGBT pipes Q1, and is opened according to the current of IGBT pipes Q1
The logical object time, the electromagnetic heating apparatus is controlled, so that the practical service time of IGBT approaches the current open-minded of IGBT pipes Q1
Object time.The present embodiment electromagnetic heating apparatus can to the drain voltage of the IGBT in control circuit in electromagnetic heating apparatus into
Row efficiently controls, and the excessively high phenomenon of drain voltage for IGBT occur is avoided, to be effectively improved electromagnetic heating apparatus
Reliability；Also, the present embodiment electromagnetic heating apparatus also has the advantages that simple in structure and easy realization.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (13)
1. a kind of electromagnetic heating control method, which is characterized in that institute's electromagnetic heating control method includes the following steps：
S1, electromagnetic heating apparatus during heating, obtain the drain voltage of IGBT pipes and the reality of the electromagnetic heating apparatus
Power；
S2, according to the drain voltage of acquired IGBT pipes and the actual power of the electromagnetic heating apparatus, adjust the IGBT
Pipe opens the object time；
S3, the object time is opened according to the current of IGBT pipes, the electromagnetic heating apparatus is controlled, so that when actually opening of IGBT
Between approach the current of IGBT pipes and open the object time.
2. electromagnetic heating control method as described in claim 1, which is characterized in that the drain voltage of the IGBT pipes is to institute
State IGBT pipes drain voltage be depressured after voltage signal values.
3. electromagnetic heating control method as claimed in claim 2, which is characterized in that the step S2 includes：
S21, when the drain voltage of IGBT pipes be greater than or equal to current goal power under corresponding predetermined threshold value when, then reduce described in
IGBT pipes open the object time；
S22, the actual power for comparing electromagnetic heating apparatus and current target power, and according to comparison result, described in adjusting
IGBT pipes open the object time.
4. electromagnetic heating control method as claimed in claim 3, which is characterized in that the step S2 further includes：
S23, when the drain voltage of IGBT pipes be less than current goal power under corresponding predetermined threshold value when, then follow the steps S22.
5. electromagnetic heating control method as described in claim 3 or 4, which is characterized in that also wrapped between step S2 and step S3
It includes：
S4, judge adjust after IGBT pipes open the object time whether be more than preset time range；The preset time
The ranging from current point in time period residing in the harmonic period of IGBT pipes corresponding opens target time range；If so,
Then follow the steps S5；If it is not, thening follow the steps S3；
S5, by the maximum value or minimum value in preset time range, open the object time as IGBT pipes are new, and execute step
Rapid S3.
6. electromagnetic heating control method as claimed in claim 4, which is characterized in that further include before the step S4：
S41, start to count when the drain voltage of the IGBT pipes is more than or equal to corresponding predetermined threshold value under current goal power
When, and each harmonic period of the IGBT pipes is divided into some time；
S42, the harmonic period according to the IGBT pipes and current timing time, determine current point in time in the humorous of IGBT pipes
It shakes the residing period in the period.
7. such as electromagnetic heating control method according to any one of claims 1 to 6, which is characterized in that the step S3 includes：
S31, every preset time period, judge whether the practical service time of the IGBT pipes approaches the current of the IGBT pipes and open
The logical object time；
S32, when currently opening the object time of the IGBT pipes is not approached when the practical service time of the IGBT pipes, adjust institute
State the practical service time of IGBT pipes；
S33, it is opened the object time when the practical service time of the IGBT pipes approaches the current of the IGBT pipes, does not then do and locate
Reason.
8. a kind of electromagnetic heating apparatus, the electromagnetic heating apparatus includes electromagnetic heating control circuit, which is characterized in that the electricity
Magnetic heating control circuit includes electromagnetic heating circuit unit, reduction voltage circuit unit, voltage and current sample circuit unit and master control core
Piece, the electromagnetic heating unit include IGBT pipes；Wherein：
The reduction voltage circuit unit, during heating for the electromagnetic heating apparatus, to the drain voltage of the IGBT pipes
It is depressured, is the voltage signal values that the main control chip can identify by the drain voltage decompression of the IGBT pipes；
The voltage and current sample circuit unit during heating for electromagnetic heating apparatus controls the electromagnetic heating
The input voltage and total current of circuit are sampled；
The main control chip during heating for electromagnetic heating apparatus obtains the drain voltage of IGBT pipes, and according to institute
The input voltage and the total current that voltage and current sample circuit unit sampling arrives are stated, the electromagnetic heating apparatus is obtained
Actual power；The drain voltage of the IGBT pipes is the voltage signal values after reduction voltage circuit unit decompression；Meanwhile according to
The drain voltage of acquired IGBT pipes and the actual power of the electromagnetic heating apparatus, adjust the IGBT pipes opens target
Time, and the object time is opened according to the current of IGBT pipes, the electromagnetic heating apparatus is controlled, so that when actually opening of IGBT
Between approach the current of IGBT pipes and open the object time.
9. electromagnetic heating apparatus as claimed in claim 8, which is characterized in that the main control chip is specifically used for：
When the drain voltage of IGBT pipes is greater than or equal to corresponding predetermined threshold value under current goal power, then reduce the IGBT
Pipe opens the object time；Compare the actual power of electromagnetic heating apparatus and preset target power, and according to comparison result, adjusts
That saves the IGBT pipes opens the object time.
10. electromagnetic heating apparatus as claimed in claim 9, which is characterized in that the main control chip is additionally operable to：
When the drain voltage of IGBT pipes is less than corresponding predetermined threshold value under current goal power, then compare electromagnetic heating apparatus
Actual power and preset target power, and according to comparison result, adjust the IGBT pipes opens the object time.
11. the electromagnetic heating apparatus as described in claim 9 or 10, which is characterized in that the main control chip is additionally operable to：
Judge the IGBT pipes after adjusting opens whether the object time is more than preset time range；The preset time range
Corresponding target time range is opened for the current point in time period residing in the harmonic period of IGBT pipes；
If so, by maximum value or minimum value in preset time range, as IGBT pipes opening the object time newly, and press
Current according to IGBT pipes opens the object time, the electromagnetic heating apparatus is controlled, so that the practical service time of IGBT approaches
The current of IGBT pipes opens the object time；
If it is not, then opening the object time according to the current of IGBT pipes, the electromagnetic heating apparatus is controlled, so that IGBT's actually opens
The logical time approaches the current of IGBT pipes and opens the object time.
12. electromagnetic heating apparatus as claimed in claim 11, which is characterized in that the main control chip is additionally operable to：
Start timing when the drain voltage of the IGBT pipes is more than or equal to corresponding predetermined threshold value under current goal power, and
Each harmonic period of the IGBT pipes is divided into some time；
According to the harmonic period of the IGBT pipes and current timing time, determine that current point in time is all in the resonance of IGBT pipes
The interim residing period.
13. the electromagnetic heating apparatus as described in any one of claim 8 to 12, which is characterized in that the main control chip is also used
In：
Every preset time period, judges whether the practical service time of the IGBT pipes approaches the current Caytoniales of the IGBT pipes
Mark the time；When currently opening the object time of the IGBT pipes is not approached when the practical service time of the IGBT pipes, adjusts institute
State the practical service time of IGBT pipes；Target is opened when the practical service time of the IGBT pipes approaches the current of the IGBT pipes
Time is then not processed.
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| CN201710014630.8A CN108289350B (en) | 2017-01-09 | 2017-01-09 | Electromagnetic heating control method and electromagnetic heating equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710014630.8A CN108289350B (en) | 2017-01-09 | 2017-01-09 | Electromagnetic heating control method and electromagnetic heating equipment |
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| CN108289350B CN108289350B (en) | 2021-03-19 |
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| CN112770430A (en) * | 2019-10-21 | 2021-05-07 | 浙江绍兴苏泊尔生活电器有限公司 | EMC (electro magnetic compatibility) optimization method, electromagnetic heating circuit and electromagnetic heating appliance |
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| CN108289350B (en) | 2021-03-19 |
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