CN107087321B - Method for adjusting hard turn-on voltage of IGBT and induction cooker - Google Patents
Method for adjusting hard turn-on voltage of IGBT and induction cooker Download PDFInfo
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- CN107087321B CN107087321B CN201710358018.2A CN201710358018A CN107087321B CN 107087321 B CN107087321 B CN 107087321B CN 201710358018 A CN201710358018 A CN 201710358018A CN 107087321 B CN107087321 B CN 107087321B
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- 230000006698 induction Effects 0.000 title claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 87
- 238000001914 filtration Methods 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000009499 grossing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
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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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- 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
Abstract
The invention provides an IGBT hard turn-on voltage adjusting method and an induction cooker. The method comprises the following steps: when detecting that the difference value of sampling voltages of the collectors of two adjacent IGBTs is in a preset range, determining that the IGBTs are hard-turned on; and adjusting the on-time of the IGBT. The method for adjusting the hard turn-on voltage of the IGBT detects whether the IGBT is hard turned on or not according to the change degree of the collector voltage of the IGBT by detecting the voltage of the collector of the IGBT, and adjusts the turn-on duration of the IGBT when the existence of the hard turn-on is determined, so that the hard turn-on voltage of the IGBT is reduced or the hard turn-on of the IGBT is avoided, and the IGBT is protected. The method for adjusting the hard turn-on voltage of the IGBT and the induction cooker solve the problem that the IGBT has higher hard turn-on voltage, protect the IGBT and have simple structure.
Description
Technical Field
The invention relates to the technical field of circuit structures, in particular to a method for adjusting hard turn-on voltage of an IGBT and an induction cooker.
Background
The induction cooker has the advantages of safety, no open fire, high efficiency, energy saving, cleaning and the like, and is common household electrical equipment. The heating principle of the induction cooker can be simply understood as: the driving circuit sends pulse signals with a certain frequency to the switching device so that the switching device is switched between on and off. The switching device is usually an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT for short). When the IGBT is turned on, the resonant circuit is charged; when the IGBT is turned off, the resonant circuit discharges to generate an alternating magnetic field, and the alternating magnetic field cuts a cooker placed on the induction cooker to heat the cooker.
When the IGBT is conducted and the resonant circuit of the induction cooker is charged, the collector voltage of the IGBT is 0V; when the IGBT is turned off and the resonant circuit discharges, the collector voltage of the IGBT is increased from 0V and then reduced to 0V again after reaching the peak value. Ideally, the collector voltage of the IGBT has dropped to 0V before each IGBT turns on when the IGBT is turned on and off in cycles.
However, when the superimposed voltage of the collector of the IGBT does not drop to 0V, and the driving circuit sends a pulse signal to the IGBT, the IGBT will be made conductive when the superimposed voltage of the collector thereof is greater than 0V, which is called hard-on. When the IGBT is hard-on, the turn-on loss of the IGBT is large, the IGBT is easy to generate heat, and is extremely easy to damage when working for a long time in the state, and the higher the voltage of the IGBT collector is, the larger the damage is. The existing IGBT has the condition of higher IGBT hard-on voltage, so that the IGBT is easy to damage.
Disclosure of Invention
In order to solve at least one problem in the background art, the invention provides a method for adjusting the hard turn-on voltage of an IGBT and an induction cooker, which are used for solving the problem that the IGBT is damaged due to the fact that the hard turn-on voltage of the IGBT is higher in the prior IGBT.
The invention provides a method for adjusting hard turn-on voltage of an IGBT, which comprises the following steps:
when detecting that the difference value of sampling voltages of the collectors of two adjacent IGBTs is in a preset range, determining that the IGBTs are hard-turned on;
and adjusting the conduction time of the IGBT.
By detecting the voltage of the collector of the IGBT, detecting whether the IGBT is hard-turned on according to the change degree of the collector voltage of the IGBT, and when the existence of the hard-turned on is determined, reducing or avoiding the hard-turned on of the IGBT by adjusting the on time of the IGBT, the IGBT is protected, and the problem that the IGBT has higher hard-turned-on voltage is solved.
The method for adjusting the hard turn-on voltage of the IGBT as described above, before determining that the IGBT is hard turned on, further includes:
and determining that the sampling voltages of the collectors of the two adjacent IGBTs are smaller than a preset peak voltage.
By determining that the sampling voltages of the collectors of two adjacent IGBTs are smaller than the preset peak voltage, the accuracy of the adjustment of the hard turn-on voltage of the IGBTs can be improved.
The method for adjusting the hard turn-on voltage of the IGBT described above, wherein when detecting that the difference between the sampling voltages of the collectors of two adjacent IGBTs is within a preset range, determining that the IGBT is hard turned on includes:
and when the difference value of the sampling voltages of the collectors of the two adjacent IGBTs is detected to be within a preset range by continuous preset times, determining that the IGBTs are hard-turned on.
By increasing the detection times, the accuracy of the adjustment of the hard turn-on voltage of the IGBT can be further improved.
The method for adjusting the hard turn-on voltage of the IGBT comprises the following steps:
and when the IGBT is detected to be conducted, starting to sample the voltage of the collector of the IGBT.
The method for adjusting the hard turn-on voltage of the IGBT, which is described above, includes:
and increasing the conduction time of the IGBT according to the sampling voltages of the collectors of the two adjacent IGBTs.
Another aspect of the present invention provides an induction cooker, comprising: the device comprises a rectification filter circuit, a resonance circuit, an IGBT, a driving circuit, a control circuit and a voltage sampling circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the resonant circuit is connected with the IGBT and is connected with a mains supply through the rectifying and filtering circuit, and the driving circuit is respectively connected with the IGBT and the control circuit;
the voltage sampling circuit is connected with the collector electrode of the IGBT;
the control circuit is connected with the voltage sampling circuit and is used for determining that the IGBT is hard to turn on and adjusting the conduction time of the IGBT when the difference value of two adjacent sampling voltages is detected to be in a preset range.
The control circuit is specifically configured to determine that the IGBT is turned on hard and adjust the on duration of the IGBT when it is detected that the difference between two adjacent sampling voltages is within a preset range and it is determined that the two adjacent sampling voltages are both less than a preset peak voltage.
The control circuit is specifically configured to determine that the IGBT is turned on hard and adjust the on duration of the IGBT when the difference between two adjacent sampling voltages is detected to be within a preset range for a preset number of times, and it is determined that the two adjacent sampling voltages are both smaller than a preset peak voltage.
The induction cooker as described above, the control circuit is further configured to,
and when the driving circuit is controlled to drive the IGBT to be conducted, controlling the voltage sampling circuit to start voltage sampling on the collector electrode of the IGBT.
As described above, the control circuit is specifically configured to increase the on-time of the IGBT according to the two adjacent sampling voltages.
The construction of the present invention and other objects and advantages thereof will be more readily understood from the description of the preferred embodiment taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an induction cooker according to the present invention;
fig. 2 is a schematic diagram of collector sampling voltages of an IGBT according to the present invention;
fig. 3 is a flowchart of a method for adjusting a hard turn-on voltage of an IGBT according to the present invention;
fig. 4 is a flow chart diagram II of a method for adjusting the hard turn-on voltage of the IGBT according to the present invention.
Reference numerals:
11-a rectifying and filtering circuit; 12-a resonant circuit; 13-IGBT;
14-a driving circuit; 15-a control circuit; 16-voltage sampling circuit.
Detailed Description
Fig. 1 is a schematic structural diagram of an induction cooker provided by the invention. Fig. 2 is a schematic diagram of collector sampling voltages of an IGBT according to the present invention. As shown in fig. 1, the induction cooker includes: the rectifier filter circuit 11, the resonance circuit 12, the IGBT13, the drive circuit 14, the control circuit 15, and the voltage sampling circuit 16.
Wherein, the resonance circuit 12 is connected with the IGBT13 and is connected with a mains supply through the rectification filter circuit 11, and the driving circuit 14 is respectively connected with the IGBT13 and the control circuit 15;
the voltage sampling circuit 16 is connected with the collector of the IGBT 13;
the control circuit 15 is connected to the voltage sampling circuit 16, and is configured to determine that the IGBT13 is turned on hard and adjust the on-time of the IGBT13 when detecting that the difference between two adjacent sampling voltages is within a preset range.
By taking an electromagnetic oven as an example, the invention provides a method for adjusting the hard turn-on voltage of the IGBT in detail. The method can also be applied to other common household appliances heated by a resonant circuit.
Referring to fig. 1, the induction cooker includes a rectifying and filtering circuit 11, a resonance circuit 12, an IGBT13, a driving circuit 14, a control circuit 15, and a voltage sampling circuit 16. The rectifying and filtering circuit 11 receives mains power for rectifying 220V ac mains power to dc and filtering out possible resonances in the grid. Providing a stable current and voltage to the resonant circuit 12. A first end of the resonance circuit 12 is connected to a first output terminal of the rectifying and filtering circuit 11, and a second end of the resonance circuit 12 is connected to a collector of the IGBT 13. An emitter of the IGBT13 is connected to the second output terminal of the rectifying and smoothing circuit 11, and an emitter of the IGBT13 is grounded. The driving circuit 14 is connected to the base of the IGBT13 and the control circuit 15, respectively. The control circuit 15 is used to control the drive circuit 14 to send pulses to the base of the IGBT13 to switch the IGBT13 on and off.
Illustratively, the control circuit 15, upon receiving an operation instruction input by a user, transmits a driving instruction to the driving circuit 14, and the driving circuit 14 transmits a pulse signal to the base of the IGBT13 in accordance with the driving instruction, the pulse signal being as shown in (a) of fig. 2. When the base of the IGBT13 receives a high-level pulse signal, the IGBT13 is turned on, and the commercial power supply charges the resonance circuit 12 through the rectifying and smoothing circuit 11. At this time, since the IGBT13 is turned on, the resistance of the IGBT13 is small when turned on, and the IGBT13 can be regarded as a wire, and thus the collector voltage and the emitter voltage of the IGBT13 are the same, and both are grounded to 0V. When the base of the IGBT13 does not receive a high level, i.e., a low level period shown in (a) of fig. 2, the IGBT13 is turned off, the mains supply fails to charge the resonance circuit 12, and the resonance circuit 12 starts discharging. At this time, the voltage of the collector and the voltage of the emitter of the IGBT13 are not the same, but are exemplary as shown in (b) or (c) of fig. 2. The voltage at the collector of the IGBT13 gradually increases with the discharge of the resonance circuit 12, and starts to decrease after reaching the peak with a decrease in energy in the resonance circuit 12 until it decreases to 0V.
However, when the base of the IGBT13 receives the driving pulse of the next cycle, if the superimposed voltage of the collector of the IGBT13 has not dropped to 0V, the IGBT13 will be turned on, and then a hard turn-on phenomenon occurs, as shown by the points a and B in fig. 2 (c).
Since the IGBT13 is turned on hard, the IGBT13 is likely to generate heat due to a large turn-on loss, and the IGBT13 is extremely vulnerable when operated in this state for a long period of time, and the higher the voltage of the collector of the IGBT13 is during the hard turn-on, the larger the damage is. Therefore, the hard turn-on voltage of the IGBT13 needs to be adjusted.
In the embodiment of the invention, a voltage sampling circuit 16 is added in the induction cooker. The voltage sampling circuit 16 is connected to the collector of the IGBT13 and the control circuit 15, respectively. The voltage sampling circuit 16 is configured to sample the voltage of the collector of the IGBT13, obtain a sampled voltage, and provide the sampled voltage to the control circuit 15. The control circuit 15 is configured to detect a sampling voltage supplied from the voltage sampling circuit 16. According to (c) in fig. 2, when the hard turn-on of the IGBT13 occurs, the voltage change speed of the collector of the IGBT13 becomes significantly slow, so it is possible to determine whether or not there is the hard turn-on of the IGBT13 according to the voltage change of the collector of the IGBT 13.
And when the control circuit 15 judges whether the difference value of two adjacent sampling voltages is within a preset range, if so, the IGBT13 is determined to be hard-turned on. For example, the control circuit 15 makes a difference between the two sampling voltages received by connection, determines whether the difference is smaller than a preset difference, if so, indicates that the two sampling voltages are relatively close to each other and have relatively small variation, and indicates that the IGBT13 is turned on hard at this time. When it is determined that the IGBT13 is turned on hard, the on-time of the IGBT13 is adjusted, and for example, the on-time of the IGBT13 may be increased to increase the energy stored in the resonant circuit 12, so that when the next driving pulse comes, the superimposed voltage of the IGBT collector is less than or equal to 0V, thereby reducing the hard-on voltage of the IGBT13 or avoiding the IGBT13 from being turned on hard. For example, the on-time of the IGBT13 may be adjusted by adjusting the width of the pulse supplied from the driving circuit 14. When the difference between the two sampling voltages is large, it is indicated that the resonant circuit 12 is normally discharged, and the IGBT13 is not turned on hard. At this time, the on-time of the IGBT13 does not need to be adjusted.
The voltage sampling circuit 16 may send the sampled voltage obtained by each sampling to the control circuit 15 immediately, and may also send the sampled voltage sequence obtained by sampling for a period of time to the control circuit 15.
Fig. 3 is a flowchart illustrating a method for adjusting the hard turn-on voltage of the IGBT according to the present invention. The method is applied to any circuit structure containing the IGBT, such as an induction cooker shown in fig. 1, and the IGBT in the circuit structure needs to be circularly turned on and turned off. The execution main body of the method is an adjusting device of the hard-on voltage of the IGBT, and the device can be realized by software and/or hardware and can also be a processor of common household appliances such as an electromagnetic oven and the like. As shown in fig. 3, the method for adjusting the hard turn-on voltage of the IGBT includes:
and S101, determining that the IGBT is hard to turn on when detecting that the difference value of sampling voltages of the collectors of two adjacent IGBTs is in a preset range.
Illustratively, a sampling voltage is obtained by sampling a voltage at the collector of the IGBT by a voltage sampling circuit. And when one sampling voltage is detected, whether the difference value between the current sampling voltage and the last sampling voltage is within a preset range or not can be immediately compared, if so, the two sampling voltages are considered to be relatively close, and the IGBT is hard-on. For example, after receiving the sampling voltage sequence provided by the voltage sampling circuit, detecting every two adjacent sampling voltages sequentially, and if detecting that the difference value of the sampling voltages of the collectors of the two adjacent IGBTs is within a preset range, determining that the IGBTs are turned on hard.
S102, adjusting the on-time of the IGBT.
Illustratively, when it is determined that the IGBT is turned on hard, the on-time of the IGBT is adjusted. For example, when the on-time of the IGBT increases, the energy increases when the IGBT discharges, so that the collector voltage of the IGBT has dropped to 0V before the next pulse comes, avoiding hard turn-on of the IGBT.
The method for adjusting the hard turn-on voltage of the IGBT comprises the steps of determining the IGBT to be turned on hard and adjusting the turn-on duration of the IGBT when the difference value of the sampling voltages of the collectors of two adjacent IGBTs is detected to be in a preset range. Detecting whether the IGBT is hard-turned on or not according to the change degree of the collector voltage of the IGBT by detecting the voltage of the collector of the IGBT, and when the existence of the hard-turned on is determined, reducing or avoiding the hard-turned on of the IGBT by adjusting the on-time of the IGBT so as to protect the IGBT. The method for adjusting the hard turn-on voltage of the IGBT and the induction cooker solve the problem that the IGBT has higher hard turn-on voltage, protect the IGBT and have simple structure.
In this embodiment, before determining whether the IGBT is turned on hard according to the difference value of the sampling voltages of the collectors of two adjacent IGBTs, the method for adjusting the hard turn-on voltage of the IGBT further includes:
and determining that the sampling voltages of the collectors of the two adjacent IGBTs are smaller than the preset peak voltage.
Illustratively, it is contemplated that the collector voltage of the IGBT13 may last for a period of time at peak when the resonant circuit 12 discharges. Therefore, two continuous sampling voltages detected during peak value have the characteristic of smaller difference value, and in order to ensure the accuracy of the adjustment of the hard turn-on voltage of the IGBT, the sampling voltages of the collectors of two adjacent IGBTs are required to be determined to be smaller than the preset peak voltage before the hard turn-on of the IGBT is determined. The peak voltage may be the voltage value input by the user or the highest voltage value sampled by the voltage sampling circuit 16.
By determining that the sampling voltages of the collectors of two adjacent IGBTs are smaller than the preset peak voltage, the accuracy of the adjustment of the hard turn-on voltage of the IGBTs can be improved.
In another aspect of the embodiment of the present invention, a method for adjusting a hard turn-on voltage of an IGBT is provided, where in this embodiment, determining whether the IGBT is hard turned on according to a difference value of sampling voltages of a collector of the IGBT specifically includes:
and when the difference value of the sampling voltages of the collectors of the two adjacent IGBTs is detected to be within a preset range by continuous preset times, determining that the IGBTs are hard-turned on.
For example, to further improve the accuracy of adjustment of the hard turn-on voltage of the IGBT, the number of times of detection may be increased. For example, if the voltage sampling circuit detects the first, second, and third … … nth sampled voltages in sequence, each pair of ith sampled voltages and the i+1th sampled voltages are compared in sequence. Wherein, the value of i is 1 to N-1, and N is a positive integer greater than 2. When detection is started, the counter is set to 0. When the difference between the first and second sampled voltages is detected to be small, the counter may be incremented by 1. If the difference between the second sampling voltage and the third sampling voltage is smaller, the counter can be increased by 1; if not, the counter is reset to 0. And when the counter value reaches the preset times, determining that the IGBT is hard-turned on.
By increasing the detection times, the accuracy reduction caused by the problems of detection errors, calculation errors and the like can be avoided, and the accuracy of the adjustment of the hard-on voltage of the IGBT can be further improved.
Fig. 4 is a schematic flow chart of a method for adjusting the hard turn-on voltage of the IGBT according to the present invention, which is exemplary, based on any of the embodiments described above. As shown in fig. 4, the method further includes:
and S201, when the IGBT is detected to be on, starting to sample the voltage of the collector of the IGBT.
S202, determining that the IGBT is hard to be turned on when detecting that the difference value of sampling voltages of the collectors of two adjacent IGBTs is in a preset range;
s203, adjusting the on-time of the IGBT.
Wherein S202 and S203 are the same as S101 and S102, and the present invention will not be repeated.
For example, since the IGBT does not appear hard on when the IGBT is turned off. To reduce power consumption, the voltage of the collector of the IGBT may be detected only when the IGBT is detected to be on. Illustratively, the control circuit 15 controls the voltage sampling circuit 16 to begin voltage sampling when a drive signal is sent to the drive circuit 14.
In another aspect of the embodiment of the present invention, a method for adjusting a hard turn-on voltage of an IGBT is provided, where in this embodiment, the adjusting the turn-on duration of the IGBT includes:
and increasing the on-time of the IGBT according to the sampling voltages of the collectors of the two adjacent IGBTs.
In the process of adjusting the on-time of the IGBT, the on-time of the IGBT may be increased according to two adjacent sampling voltages, or the on-time of the IGBT may be adjusted according to only one of the sampling voltages. Specifically, the higher the sampling voltage, the greater the degree to which the on-time needs to be increased.
For example, referring to the above embodiment, the control circuit 15 is specifically configured to determine that the IGBT13 is turned on hard and adjust the on-time of the IGBT13 when it is detected that the difference between two adjacent sampled voltages is within the preset range and it is determined that both of the two adjacent sampled voltages are smaller than the preset peak voltage.
The control circuit 15 is specifically configured to determine that the IGBT13 is turned on hard and adjust the on-time of the IGBT13 when the difference between two adjacent sampling voltages is detected within the preset range for a preset number of times, and it is determined that both of the two adjacent sampling voltages are smaller than the preset peak voltage.
Illustratively, the control circuit 15 includes a counter for counting the number of times that the difference between two adjacent sampled voltages is continuously detected within a preset range.
The control circuit 15 is also used for controlling the voltage sampling circuit 16 to start voltage sampling on the collector of the IGBT13 when the control driving circuit 14 drives the IGBT13 to be turned on, for example.
The control circuit 15 is specifically configured to increase the on-time of the IGBT13 according to two adjacent sampling voltages.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The method for adjusting the hard turn-on voltage of the IGBT is characterized by comprising the following steps of:
when detecting that the difference value of sampling voltages of the collectors of two adjacent IGBTs is in a preset range, determining that the IGBTs are hard-turned on;
adjusting the conduction time of the IGBT;
before determining that the IGBT is hard-turned on, the method further comprises the following steps:
and determining that the sampling voltages of the collectors of the two adjacent IGBTs are smaller than a preset peak voltage.
2. The method according to claim 1, wherein determining that the IGBT is turned on hard when the difference in the sampling voltages of the collectors of two adjacent IGBTs is detected to be within a preset range, comprises:
and when the difference value of the sampling voltages of the collectors of the two adjacent IGBTs is detected to be within a preset range by continuous preset times, determining that the IGBTs are hard-turned on.
3. The method according to any one of claims 1 to 2, further comprising:
and when the IGBT is detected to be conducted, starting to sample the voltage of the collector of the IGBT.
4. The method of claim 1, wherein the adjusting the turn-on duration of the IGBT comprises:
and increasing the conduction time of the IGBT according to the sampling voltages of the collectors of the two adjacent IGBTs.
5. An induction cooker, comprising: the device comprises a rectification filter circuit (11), a resonant circuit (12), an IGBT (13), a driving circuit (14) and a control circuit (15), wherein the resonant circuit (12) is connected with the IGBT (13) and is connected with a mains supply through the rectification filter circuit (11), and the driving circuit (14) is respectively connected with the IGBT (13) and the control circuit (15); characterized by further comprising: a voltage sampling circuit (16); wherein, the liquid crystal display device comprises a liquid crystal display device,
the voltage sampling circuit (16) is connected with the collector electrode of the IGBT (13);
the control circuit (15) is connected with the voltage sampling circuit (16) and is used for determining that the IGBT (13) is hard-turned on and adjusting the conduction time of the IGBT (13) when the difference value of two adjacent sampling voltages is detected to be in a preset range;
the control circuit (15) is specifically configured to determine that the IGBT (13) is turned on hard and adjust the on duration of the IGBT (13) when it is detected that the difference between two adjacent sampling voltages is within a preset range and it is determined that the two adjacent sampling voltages are both less than a preset peak voltage;
the rectification filter circuit is used for receiving a mains supply, rectifying the mains supply into direct current and filtering out resonance in a power grid.
6. The induction cooker according to claim 5, wherein the control circuit (15) is specifically configured to determine that the IGBT (13) is turned on hard and adjust the on-time of the IGBT (13) when the difference between two adjacent sampled voltages is detected within a preset range for a preset number of times, and it is determined that the two adjacent sampled voltages are both smaller than a preset peak voltage.
7. An induction hob according to any one of the claims 5 to 6, characterized in, that the control circuit (15) is also used for,
when the driving circuit (14) is controlled to drive the IGBT (13) to conduct, the voltage sampling circuit (16) is controlled to start voltage sampling on the collector of the IGBT (13).
8. The induction hob according to claim 5, characterized in, that the control circuit (15) is specifically configured to increase the on-time of the IGBT (13) according to the two adjacent sampled voltages.
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| CN201710358018.2A CN107087321B (en) | 2017-05-19 | 2017-05-19 | Method for adjusting hard turn-on voltage of IGBT and induction cooker |
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| CN109788592B (en) * | 2017-11-14 | 2021-07-30 | 佛山市顺德区美的电热电器制造有限公司 | IGBT opening width limit value determining method and device, medium and electromagnetic heating appliance |
| US11678410B2 (en) * | 2019-07-24 | 2023-06-13 | Haier Us Appliance Solutions, Inc. | Determining presence of compatible cookware in induction heating systems |
| CN113040598B (en) * | 2019-12-27 | 2023-09-29 | 浙江绍兴苏泊尔生活电器有限公司 | Cooking control method and device |
| CN114698173B (en) * | 2020-12-29 | 2023-01-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment and power control method and power control device thereof |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136612A (en) * | 2006-08-31 | 2008-03-05 | 沃福森微电子股份有限公司 | Amplifier device and method |
| CN101169259A (en) * | 2006-10-27 | 2008-04-30 | 黄海宁 | Continuous low power heating electromagnetic oven control structure and its control method |
| CN102361524A (en) * | 2011-10-14 | 2012-02-22 | 刘俊 | Method for increasing power of electromagnetic oven and circuit thereof |
| CN204442725U (en) * | 2015-03-04 | 2015-07-01 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear |
| CN204539516U (en) * | 2015-04-29 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and switching tube thereof opens control device |
| CN204795667U (en) * | 2015-07-01 | 2015-11-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and electromagnetic heating system's drive arrangement |
| CN204859594U (en) * | 2015-07-28 | 2015-12-09 | 佛山市顺德区美的电热电器制造有限公司 | System on chip/SOC's electromagnetic heating control system |
| CN105682271A (en) * | 2016-01-29 | 2016-06-15 | 杭州信多达电器有限公司 | PPG drive frequency detection system for induction cooker |
| CN105992419A (en) * | 2015-03-04 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, and zero-crossing switched-on detection method and device of switch tube |
| CN106211391A (en) * | 2015-04-29 | 2016-12-07 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and switching tube thereof opens control apparatus and method |
| CN106211394A (en) * | 2015-04-30 | 2016-12-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and switching tube thereof open control apparatus and method |
| CN106332338A (en) * | 2015-07-01 | 2017-01-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, and driving device and driving method of electromagnetic heating system |
| CN107027200A (en) * | 2016-02-02 | 2017-08-08 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its heating control circuit and method for heating and controlling |
| CN206755257U (en) * | 2017-05-19 | 2017-12-15 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic oven |
-
2017
- 2017-05-19 CN CN201710358018.2A patent/CN107087321B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136612A (en) * | 2006-08-31 | 2008-03-05 | 沃福森微电子股份有限公司 | Amplifier device and method |
| CN101169259A (en) * | 2006-10-27 | 2008-04-30 | 黄海宁 | Continuous low power heating electromagnetic oven control structure and its control method |
| CN102361524A (en) * | 2011-10-14 | 2012-02-22 | 刘俊 | Method for increasing power of electromagnetic oven and circuit thereof |
| CN105992419A (en) * | 2015-03-04 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, and zero-crossing switched-on detection method and device of switch tube |
| CN204442725U (en) * | 2015-03-04 | 2015-07-01 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and breaker in middle pipe thereof opens checkout gear |
| CN106211391A (en) * | 2015-04-29 | 2016-12-07 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and switching tube thereof opens control apparatus and method |
| CN204539516U (en) * | 2015-04-29 | 2015-08-05 | 佛山市顺德区美的电热电器制造有限公司 | The zero passage of electromagnetic heating system and switching tube thereof opens control device |
| CN106211394A (en) * | 2015-04-30 | 2016-12-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and switching tube thereof open control apparatus and method |
| CN204795667U (en) * | 2015-07-01 | 2015-11-18 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and electromagnetic heating system's drive arrangement |
| CN106332338A (en) * | 2015-07-01 | 2017-01-11 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, and driving device and driving method of electromagnetic heating system |
| CN204859594U (en) * | 2015-07-28 | 2015-12-09 | 佛山市顺德区美的电热电器制造有限公司 | System on chip/SOC's electromagnetic heating control system |
| CN105682271A (en) * | 2016-01-29 | 2016-06-15 | 杭州信多达电器有限公司 | PPG drive frequency detection system for induction cooker |
| CN107027200A (en) * | 2016-02-02 | 2017-08-08 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its heating control circuit and method for heating and controlling |
| CN206755257U (en) * | 2017-05-19 | 2017-12-15 | 浙江绍兴苏泊尔生活电器有限公司 | Electromagnetic oven |
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