CN108076545A - A kind of guard method of IGBT collector voltages, system and electromagnetic oven compared based on electric current - Google Patents
A kind of guard method of IGBT collector voltages, system and electromagnetic oven compared based on electric current Download PDFInfo
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- CN108076545A CN108076545A CN201611009641.9A CN201611009641A CN108076545A CN 108076545 A CN108076545 A CN 108076545A CN 201611009641 A CN201611009641 A CN 201611009641A CN 108076545 A CN108076545 A CN 108076545A
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- current value
- igbt
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
- H02H7/205—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
-
- 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/129—Cooking devices induction ovens
Abstract
A kind of guard method of IGBT collector voltages, system and electromagnetic oven compared based on electric current is related to electromagnetic oven protection field.Purpose in solve when IGBT collector voltages are protected in electromagnetic heating system, the problem of being often subject to and match somebody with somebody pot, compared using a reference voltage, the power of other cookwares can be sacrificed significantly.Two the comparator CMP1 and CMP2 being connected in parallel are connected on IGBT collectors first in electromagnetic heating system, and the initial reference voltage of two comparators is set before being heated to cookware；Then the IGBT electric currents in electromagnetic heating system are acquired in cookware heating process, obtain current actual current value；Finally by actual current value compared with default target current value, and according to the reference voltage of the difference control comparator CMP2 between actual current value and target current value.The present invention is suitable for protection IGBT collector voltages.
Description
Technical field
The present invention relates to electromagnetic ovens to protect field, and in particular to IGBT collector voltages protect field in electromagnetic oven.
Background technology
In existing electromagnetic heating system, in order to which IGBT collectors is protected by over-voltage breakdown, one not to be provided in software
Maximum pulse width, but due to the coupled system spacing of cookware and drum, i.e. disk spacing is uncontrollable, causes to couple under different disk spacing
The induction reactance arrived is different with impedance, and same target power difference model machine collector voltage is inconsistent, and higher anode IGBT's is reliable
Property opposite be deteriorated.
In view of the above situation, often a collector voltage is added in hardware in current collector voltage protection
The comparison of sampling, if collector voltage is excessively high, hardware directly limits maximum and opens pulsewidth.But product development often using match somebody with somebody pot as
Standard is compared using a reference voltage, can sacrifice the power of other cookwares significantly.
The content of the invention
The present invention provides a kind of guard method of IGBT collector voltages, system and electromagnetic oven compared based on electric current, purpose
It, when IGBT collector voltages are protected in electromagnetic heating system, is often subject in solution and matches somebody with somebody pot, use a ginseng
The problem of examining voltage to compare, the power of other cookwares can be sacrificed significantly.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of IGBT collector voltages compared based on electric current
Guard method, it comprises the following steps：
Two the comparator CMP1 and CMP2 being connected in parallel are connected on S1, the IGBT collectors in electromagnetic heating system,
And the initial reference voltage of two comparators is set before being heated to cookware；
S2, the IGBT electric currents in electromagnetic heating system are acquired in cookware heating process, obtain current reality
Current value；
S3, by actual current value compared with default target current value, and according to actual current value and target current
The reference voltage of difference control comparator CMP2 between value.
The beneficial effects of the invention are as follows：The present invention can control IGBT collector voltages by setting one by software adjustment
The reference voltage of the comparator of protection, on the basis of reliability is not influenced, the appropriate threshold value for adjusting reference voltage, to match not
With the protection voltage of cookware, cookware suitability is promoted.
Based on the above technical solutions, the present invention can also be improved as follows.
Further, the initial reference voltage of the comparator CMP1 is more than the initial reference voltage of comparator CMP2.
Advantageous effect using above-mentioned further scheme is：Comparator CMP1 is protected as hard, as long as reaching target voltage,
It limits maximum power or pause a period of time heats, therefore, which is arranged to larger initial reference voltage, made
For the mandatory protection of reliability.
Further, the process that the reference voltage of comparator CMP2 is controlled in the S3 is：
S31, compare difference between actual current value and target current value, and judge whether the difference is more than the first reference
Value, if it is, the reference voltage of comparator CMP2 is promoted to the first reference voltage from initial reference voltage, if it is not, then
Perform S32；
S32, judge whether the difference is more than the second reference value and less than the first reference value, if it is, by comparator
The reference voltage of CMP2 is promoted to the second reference voltage from initial reference voltage, if it is not, then the reference electricity by comparator CMP2
Pressure maintains initial reference voltage.
Advantageous effect using above-mentioned further scheme is：Comparator CMP2 as soft protection, in same cookware or
During different cookwares, can control the reference voltage of comparator by current differential, when the low cookware of power improve power.
Further, first reference value is 10.
Further, second reference value is 5.
Further, the second reference voltage of the comparator CMP2 between the first reference voltage and initial reference voltage it
Between.
Advantageous effect using above-mentioned further scheme is：According to different current differentials, control comparator CMP1 successively
Reference voltage, to improve the power of cookware.
Further, the initial reference voltage of the comparator CMP1 is more than the first reference voltage of comparator CMP2.
Advantageous effect using above-mentioned further scheme is：Comparator CMP1 is arranged to larger initial reference voltage,
Mandatory protection as reliability.
A kind of IGBT collector voltages protection system compared based on electric current, it is included in the IGBT in electromagnetic heating system
Two the comparator CMP1 and CMP2 being connected in parallel are connected on collector, the system also includes：
Initial reference voltage setup module, for setting the initial reference electricity of two comparators before being heated to cookware
Pressure；
Current acquisition module, for being acquired in cookware heating process to the IGBT electric currents in electromagnetic heating system,
Obtain current actual current value；
Reference voltage control module, for by actual current value compared with default target current value, and according to reality
The reference voltage of difference control comparator CMP2 between border current value and target current value.
The beneficial effects of the invention are as follows：The present invention can control IGBT collector voltages by setting one by software adjustment
The reference voltage of the comparator of protection, on the basis of reliability is not influenced, the appropriate threshold value for adjusting reference voltage, to match not
With the protection voltage of cookware, cookware suitability is promoted.
Further, the initial reference voltage of the comparator CMP1 is more than the initial reference voltage of comparator CMP2.
Advantageous effect using above-mentioned further scheme is：Comparator CMP1 is protected as hard, as long as reaching target voltage,
It limits maximum power or pause a period of time heats, therefore, which is arranged to larger initial reference voltage, made
For the mandatory protection of reliability.
Further, the reference voltage control module includes：
First control module for comparing the difference between actual current value and target current value, and judges that the difference is
It is no to be more than the first reference value, if it is, the reference voltage of comparator CMP2 is promoted to the first reference from initial reference voltage
Voltage, if it is not, then starting the second control module；
Second control module, for judging whether the difference is more than the second reference value and less than the first reference value, if so,
The reference voltage of comparator CMP2 is then promoted to the second reference voltage from initial reference voltage, if it is not, then by comparator
The reference voltage of CMP2 maintains initial reference voltage.
Advantageous effect using above-mentioned further scheme is：Comparator CMP2 as soft protection, in same cookware or
During different cookwares, can control the reference voltage of comparator by current differential, when the low cookware of power improve power.
Further, first reference value is 10.
Further, second reference value is 5.
Further, the second reference voltage of the comparator CMP2 between the first reference voltage and initial reference voltage it
Between.
Advantageous effect using above-mentioned further scheme is：According to different current differentials, control comparator CMP1 successively
Reference voltage, to improve the power of cookware.
Further, the initial reference voltage of the comparator CMP1 is more than the first reference voltage of comparator CMP2.
Advantageous effect using above-mentioned further scheme is：Comparator CMP1 is arranged to larger initial reference voltage,
Mandatory protection as reliability.
A kind of electromagnetic oven, the electromagnetic oven include the IGBT collector voltages protection system described above compared based on electric current
System.On the basis of reliability is not influenced, the appropriate threshold value for adjusting reference voltage to match the protection voltage of different cookwares, carries
Rise cookware suitability.
Description of the drawings
Fig. 1 is the flow chart of the IGBT collector voltage guard methods compared based on electric current described in the embodiment of the present invention；
Fig. 2 is the flow chart of the reference voltage of the control comparator CMP2 described in the embodiment of the present invention；
Fig. 3 is that the IGBT collector voltages compared based on electric current described in the embodiment of the present invention protect the principle of system to illustrate
Figure；
Fig. 4 is the integration principle figure of the comparator CMP1 and comparator CMP2 described in the embodiment of the present invention；
Fig. 5 is the workflow of the IGBT collector voltages compared based on electric current the protection system described in the embodiment of the present invention
Figure.
In attached drawing, parts list represented by the reference numerals is as follows：
1st, initial reference voltage setup module, 2, current acquisition module, 3, reference voltage control module, the 4, first control mould
Block, the 5, second control module.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
Embodiment 1
As shown in Figure 1, the present embodiment proposes a kind of IGBT collector voltage guard methods compared based on electric current, it includes
Following steps：
Two the comparator CMP1 and CMP2 being connected in parallel are connected on S1, the IGBT collectors in electromagnetic heating system,
And the initial reference voltage of two comparators is set before being heated to cookware；
S2, the IGBT electric currents in electromagnetic heating system are acquired in cookware heating process, obtain current reality
Current value；
S3, by actual current value compared with default target current value, and according to actual current value and target current
The reference voltage of difference control comparator CMP2 between value；
Wherein, as shown in Fig. 2, specifically the process of the reference voltage of control comparator CMP2 is as follows：
S31, compare difference between actual current value and target current value, and judge whether the difference is more than 10, if
It is that the reference voltage of comparator CMP2 is then promoted to the first reference voltage from initial reference voltage, if it is not, then performing S32；
S32, judge whether the difference is more than 5 and less than 10, if it is, by the reference voltage of comparator CMP2 from initial
Reference voltage is promoted to the second reference voltage, if it is not, then the reference voltage of comparator CMP2 is maintained initial reference voltage.
It is above-mentioned to be to actual current value and the process of target current value progress difference comparsion：First by actual current value and mesh
The current signal of mark current value is respectively converted into voltage signal, then compares transformed voltage signal by a 5V voltages
Circuit is sent to microcontroller progress mathematic interpolation after carrying out numerical value conversion, obtains binary numeral, then binary numeral is converted
Actual current value and the difference of target current value can be obtained after into the decimal system.
In method described in the present embodiment, comparator CMP1 is as hard protection, as long as reaching target voltage, i.e. limitation is maximum
Power or pause a period of time heat, can be as the mandatory protection of reliability, therefore the initial reference voltage of comparator CMP1
It is larger, it is preferred that the initial reference voltage of comparator CMP1 is more than the initial reference voltage of comparator CMP2 and is more than
The first reference voltage of comparator CMP2.
Comparator CMP2 is as soft protection, when the collector voltage of IGBT reaches a threshold value, there is that there are two types of situations：
1st, when using unlike material cookware, under same target power, due to protecting the limitation of voltage, the cookware of material difference
Target power is not achieved, i.e., there are current difference, by comparing current difference, to identify the difference of cookware, and is adjusted with this more electric
The threshold value of pressure selects the smaller threshold value of comparison voltage, and the cookware for making power low as far as possible in the case where ensureing the performance of reliability improves work(
Rate；
2nd, for same cookware as matched somebody with somebody pot, in the case of different disk spacing and cookware deformation quantity, although disk spacing
It is not detected with cookware deflection, when disk spacing is bigger than normal, cookware is raised, can become higher same target power lower collector voltage,
Actual current is caused to be not achieved the situation of target current, but the method can also be by adjusting voltage through this embodiment
Threshold value power is made to reach desired value.
Embodiment 2
As shown in figure 3, the present embodiment proposes a kind of IGBT collector voltages protection system compared based on electric current, it is wrapped
Two the comparator CMP1 and CMP2 being connected in parallel of connection on the IGBT collectors in electromagnetic heating system are included, the system is also
Including：
Initial reference voltage setup module 1, for setting the initial reference of two comparators before being heated to cookware
Voltage；
Current acquisition module 2, for being acquired in cookware heating process to the IGBT electric currents in electromagnetic heating system,
Obtain current actual current value；
Reference voltage control module 3, for by actual current value compared with default target current value, and according to reality
The reference voltage of difference control comparator CMP2 between border current value and target current value.
The reference voltage control module 3 includes：
First control module 4 for comparing the difference between actual current value and target current value, and judges that the difference is
It is no to be more than 10, if it is, the reference voltage of comparator CMP2 is promoted to the first reference voltage from initial reference voltage, if
It is no, then start the second control module 5；
Second control module 5 for judging whether the difference is more than the second reference value and less than the first reference value, and judges
Whether the difference is more than 5, if it is, the reference voltage of comparator CMP2 is promoted to second with reference to electricity from initial reference voltage
Pressure, if it is not, then the reference voltage of comparator CMP2 is maintained initial reference voltage.
It is above-mentioned to be to actual current value and the process of target current value progress difference comparsion：First by actual current value and mesh
The current signal of mark current value is respectively converted into voltage signal, then compares transformed voltage signal by a 5V voltages
Circuit is sent to microcontroller progress mathematic interpolation after carrying out numerical value conversion, obtains binary numeral, then binary numeral is converted
Actual current value and the difference of target current value can be obtained after into the decimal system.
In system described in the present embodiment, comparator CMP1 is as hard protection, as long as reaching target voltage, i.e. limitation is maximum
Power or pause a period of time heat, can be as the mandatory protection of reliability, therefore the initial reference voltage of comparator CMP1
It is larger, it is preferred that the initial reference voltage of comparator CMP1 is more than the initial reference voltage of comparator CMP2 and is more than
The first reference voltage of comparator CMP2.
Comparator CMP2 is as soft protection, when the collector voltage of IGBT reaches a threshold value, there is that there are two types of situations：
1st, when using unlike material cookware, under same target power, due to protecting the limitation of voltage, the cookware of material difference
Target power is not achieved, i.e., there are current difference, by comparing current difference, to identify the difference of cookware, and is adjusted with this more electric
The threshold value of pressure selects the smaller threshold value of comparison voltage, and the cookware for making power low as far as possible in the case where ensureing the performance of reliability improves work(
Rate；
2nd, for same cookware as matched somebody with somebody pot, in the case of different disk spacing and cookware deformation quantity, although disk spacing
It is not detected with cookware deflection, when disk spacing is bigger than normal, cookware is raised, can become higher same target power lower collector voltage,
Actual current is caused to be not achieved the situation of target current, but the system can also be by adjusting voltage through this embodiment
Threshold value power is made to reach desired value.
Embodiment 3
The integration principle figure of comparator CMP1 and comparator CMP2 are illustrated in figure 4, comparator CMP1 is protected as hard, and one
As consider that reliability program only does and once configures, such as be configured to 8/12VDD；Comparator CMP2 is as soft protection, the ginseng compared
Examining voltage can be adjusted by software.After different cookwares are identified as, the very big cookware of gauge current difference is directly with for example
7/12VDD as the reference voltage, it is larger with such as 6/12 as the reference voltage, otherwise using such as 5/12VDD as with reference to electricity
It presses to meet power requirement.
Specific control flow is as shown in Figure 5：
It is first powered up initializing, the reference voltage of configuration comparator CMP1 is 8/12VDD, configures the reference of comparator CMP2
Voltage is 5/12VDD, and then cookware is heated, and the electric current in heating system is gathered in heating process, and judges to examine
Difference between the actual current value of survey and default target current value, when current differential is more than more than 10, by comparator
The reference voltage of CMP2 is changed to 7/12VDD and continues to heat, when current differential is less than 10 and is more than 5, by comparator
The reference voltage of CMP2 is changed to 6/12VDD, when current differential is less than 5, maintains the initial reference voltage 5/ of comparator CMP2
12VDD。
It in the above manner can be on the basis of reliability not be influenced, by adjusting as soft protection comparator CMP2's
The threshold value of reference voltage matches the protection voltage of different cookwares, promotes cookware suitability.
Embodiment 4
The present embodiment proposes a kind of electromagnetic oven, and the electromagnetic oven includes the IGBT current collections described above compared based on electric current
Pole tension protects system, collector voltage is compared by increasing a soft protection comparator CMP2, comparison that software is adjustable
The reference voltage of device under the premise of reliability is not influenced, realizes the improvement to different cookware power uniformity.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (15)
1. a kind of IGBT collector voltage guard methods compared based on electric current, which is characterized in that it comprises the following steps：
Two the comparator CMP1 and CMP2 being connected in parallel of connection on S1, the IGBT collectors in electromagnetic heating system, and
The initial reference voltage of two comparators is set before being heated to cookware；
S2, the IGBT electric currents in electromagnetic heating system are acquired in cookware heating process, obtain current actual current
Value；
S3, by actual current value compared with default target current value, and according to actual current value and target current value it
Between difference control comparator CMP2 reference voltage.
2. a kind of IGBT collector voltage guard methods compared based on electric current according to claim 1, which is characterized in that
The initial reference voltage of the comparator CMP1 is more than the initial reference voltage of comparator CMP2.
3. a kind of IGBT collector voltage guard methods compared based on electric current according to claim 2, which is characterized in that
The process that the reference voltage of comparator CMP2 is controlled in the S3 is：
S31, compare difference between actual current value and target current value, and judge whether the difference is more than the first reference value,
If it is, the reference voltage of comparator CMP2 is promoted to the first reference voltage from initial reference voltage, if it is not, then performing
S32；
S32, judge whether the difference is more than the second reference value and less than the first reference value, if it is, by comparator CMP2's
Reference voltage is promoted to the second reference voltage from initial reference voltage, if it is not, then the reference voltage of comparator CMP2 is maintained
In initial reference voltage.
4. a kind of IGBT collector voltage guard methods compared based on electric current according to claim 3, which is characterized in that
First reference value is 10.
5. a kind of IGBT collector voltage guard methods compared based on electric current according to claim 3 or 4, feature are existed
In second reference value is 5.
6. a kind of IGBT collector voltage guard methods compared based on electric current according to claim 3, which is characterized in that
The second reference voltage of the comparator CMP2 is between the first reference voltage and initial reference voltage.
7. a kind of IGBT collector voltage guard methods compared based on electric current according to claim 3 or 6, feature are existed
In the initial reference voltage of the comparator CMP1 is more than the first reference voltage of comparator CMP2.
8. a kind of IGBT collector voltages protection system compared based on electric current, which is characterized in that the system comprises in electromagnetism
Two the comparator CMP1 and CMP2 being connected in parallel are connected on IGBT collectors in heating system, the system also includes：
Initial reference voltage setup module (1), for setting the initial reference electricity of two comparators before being heated to cookware
Pressure；
Current acquisition module (2) for being acquired in cookware heating process to the IGBT electric currents in electromagnetic heating system, obtains
Take current actual current value；
Reference voltage control module (3), for by actual current value compared with default target current value, and according to reality
The reference voltage of difference control comparator CMP2 between current value and target current value.
9. a kind of IGBT collector voltages protection system compared based on electric current according to claim 8, which is characterized in that
The initial reference voltage of the comparator CMP1 is more than the initial reference voltage of comparator CMP2.
10. a kind of IGBT collector voltages protection system compared based on electric current according to claim 9, feature are existed
In the reference voltage control module (3) includes：
Whether first control module (4) for comparing the difference between actual current value and target current value, and judges the difference
More than the first reference value, if it is, the reference voltage of comparator CMP2 is promoted to first with reference to electricity from initial reference voltage
Pressure, if it is not, then starting the second control module (5)；
Second control module (5), for judging whether the difference is more than the second reference value and less than the first reference value, if so,
The reference voltage of comparator CMP2 is then promoted to the second reference voltage from initial reference voltage, if it is not, then by comparator
The reference voltage of CMP2 maintains initial reference voltage.
11. a kind of IGBT collector voltages protection system compared based on electric current according to claim 10, feature are existed
In first reference value is 10.
12. a kind of IGBT collector voltages protection system compared based on electric current according to claim 10, feature are existed
In second reference value is 5.
13. a kind of IGBT collector voltages protection system compared based on electric current according to claim 8, feature are existed
In the second reference voltage of the comparator CMP2 is between the first reference voltage and initial reference voltage.
14. a kind of IGBT collector voltages protection system compared based on electric current according to claim 8 or 13, feature
It is, the initial reference voltage of the comparator CMP1 is more than the first reference voltage of comparator CMP2.
15. a kind of electromagnetic oven, which is characterized in that the electromagnetic oven includes comparing based on electric current described in claim 8 to 14
IGBT collector voltages protect system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611009641.9A CN108076545B (en) | 2016-11-16 | 2016-11-16 | IGBT collector voltage protection method and system based on current comparison and induction cooker |
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|---|---|---|---|
| CN201611009641.9A CN108076545B (en) | 2016-11-16 | 2016-11-16 | IGBT collector voltage protection method and system based on current comparison and induction cooker |
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| CN108076545B CN108076545B (en) | 2020-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110613313A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
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| US5376775A (en) * | 1991-10-24 | 1994-12-27 | Goldstar Co., Ltd. | High frequency induction heating appliance |
| JP2000208244A (en) * | 1998-12-31 | 2000-07-28 | Lg Electronics Inc | Initial operation circuit of induction heating cooking appliance |
| CN102280869A (en) * | 2010-06-09 | 2011-12-14 | 株式会社电装 | Switching device |
| CN202565161U (en) * | 2011-12-22 | 2012-11-28 | 成都成电硅海科技股份有限公司 | Power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110613313A (en) * | 2018-06-20 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
| CN110613313B (en) * | 2018-06-20 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and over-current control method and control device of IGBT (insulated gate bipolar transistor) of electromagnetic heating cooking utensil |
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|---|---|
| CN108076545B (en) | 2020-12-22 |
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