CN112003598B - Method and circuit for realizing IGBT driving pulse width limitation and cooking appliance - Google Patents
Method and circuit for realizing IGBT driving pulse width limitation and cooking appliance Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010411 cooking Methods 0.000 title claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 29
- 238000001914 filtration Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910001006 Constantan Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/04—Shaping pulses by increasing duration; by decreasing duration
- H03K5/07—Shaping pulses by increasing duration; by decreasing duration by the use of resonant circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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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
- 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
Abstract
The invention provides a method, a circuit and a cooking utensil for realizing IGBT driving pulse width limitation, wherein the circuit comprises: the voltage sampling module is used for detecting the power supply input voltage of the current circuit; the main control module is used for outputting a PPG signal with a preset pulse width to carry out IGBT drive control; the current sampling module is used for detecting the maximum current value of the IGBT in the current state; the main control module is further used for calculating the complete machine inductance of the cooking utensil according to the power input voltage, the preset pulse width and the maximum current value, calculating the maximum limit pulse width of the IGBT driving signal according to the complete machine inductance, the maximum back pressure value allowed to be borne by the current IGBT and the maximum pulse current, and limiting the pulse width of the output PPG signal in real time according to the maximum limit pulse width. The invention can ensure the maximum driving pulse width limiting margin, ensure the working reliability of the IGBT, reduce the fault rate of the product, ensure the long-term operation of the product according to the target power and improve the user experience.
Description
Technical Field
The invention relates to the technical field of electromagnetic heating, in particular to a method and a circuit for limiting IGBT driving pulse width and a cooking appliance.
Background
With the improvement of living standard of people and the increasing cost performance of IH cooking utensils, more and more people can select the IH cooking utensils with better cooking effect, the using environment of the IH cooking utensils is more complex, and the requirement on the reliability of the control of the IGBT of the core device is higher and higher.
Considering the influence of external environment interference and pot tossing, under the condition of ensuring the target power, the driving PPG pulse width of the IGBT can be correspondingly limited and protected, so that the phenomenon that the IGBT is in overvoltage or overcurrent failure due to the fact that the output of overlarge pulse width is avoided. In order to prevent the power influence caused by the fluctuation of the utility power, the constant power control is generally performed within the range of 160-265V of the power supply voltage. The pulse width of the IGBT output at the same power is mainly affected by the following factors: 1) the influence of power supply voltage, large low-voltage pulse width and small high-voltage pulse width; 2) the distance between the wire spool and the cooker is influenced, the distance is small, and the distance is large. Therefore, parameters such as inductance of the whole machine are changed under the influence of batch whole machine difference and structural member aging, so that the pulse width of the PPG has larger difference even under the same power and the same power supply voltage, and the problem that the margin of pulse width limitation is difficult to evaluate is brought to a designer. The situation that the power of the whole machine cannot reach the target power can occur due to the fact that the margin of the pulse width limitation is too small, and the effect of protecting the IGBT cannot be achieved due to the fact that the margin of the pulse width limitation is too large.
In order to solve the above problems, the existing solutions mainly include the following two types: 1) designing a margin limit for the pulse width of rated operation at low pressure; 2) and setting a limit value of a fixed allowance between the gear-shifting regions aiming at rated working pulse widths under different voltages. The inventor finds that the prior art at least has the following technical problems in the process of implementing the invention: according to the first scheme, due to the fact that the pulse width difference value under high voltage and low voltage is large, the pulse width allowance under high voltage is too large, and the limiting protection effect cannot be achieved; and the second scheme is complex and tedious, the limitation of the margin pulse width is not flexible enough, the intelligent adjustment cannot be performed according to the change of external conditions or the fluctuation of the system per se, and the situations that the margin is insufficient and the power cannot operate as expected are likely to occur.
Disclosure of Invention
The invention provides a method, a circuit and a cooking utensil for realizing IGBT driving pulse width limitation, and solves the problems that in the prior art, the maximum limit pulse width allowance is difficult to evaluate, the pulse width limitation is fixed, and intelligent adjustment cannot be realized.
In one aspect of the present invention, a circuit for implementing IGBT driving pulse width limitation is provided, including a main control module, and a voltage sampling module and a current sampling module connected to the main control module, wherein:
the voltage sampling module is used for detecting the power supply input voltage of the current circuit;
the main control module is used for outputting a PPG signal with a preset pulse width to carry out IGBT drive control;
the current sampling module is used for detecting the maximum current value of the IGBT in the current state;
the main control module is also used for calculating the complete machine inductance of the cooking appliance according to the power input voltage detected by the voltage sampling module, the preset pulse width and the maximum current value detected by the current sampling module, and calculating the maximum limit pulse width of the IGBT driving signal according to the complete machine inductance, the maximum back pressure value allowed to be borne by the current IGBT and the maximum pulse current;
and the main control module is also used for limiting the pulse width of the output PPG signal in real time according to the maximum limit pulse width.
Optionally, the main control module is specifically configured to control a pulse width of the output PPG signal to be less than or equal to the maximum limit pulse width.
Optionally, the circuit further includes a first filtering module, where the first filtering module is configured to filter a power input voltage signal.
Optionally, the circuit further includes a rectifying module, where the rectifying module is configured to rectify the power input voltage signal.
Optionally, the circuit further includes a second filtering module, where the second filtering module is configured to rectify a power input voltage signal and provide a loop for a parallel resonant circuit formed by a wire spool and a resonant capacitor in the cooking appliance.
In another aspect of the present invention, a method for implementing IGBT driving pulse width limitation is provided, the method comprising:
under the condition of initial power supply input voltage, carrying out IGBT drive control by using a PPG signal with a preset pulse width, and detecting the maximum current value of the IGBT in the current state;
calculating the inductance of the whole machine according to the power input voltage, the preset pulse width and the detected maximum value of the current;
calculating the maximum limit pulse width of an IGBT driving signal according to the inductance of the whole machine, the maximum back pressure value allowed to be borne by the current IGBT and the maximum pulse current;
and limiting the pulse width of the output PPG signal in real time according to the maximum limit pulse width.
Optionally, the real-time limiting the pulse width of the output PPG signal according to the maximum limit pulse width comprises:
and controlling the pulse width of the output PPG signal to be less than or equal to the maximum limit pulse width.
Furthermore, the invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
In addition, the invention also provides an electromagnetic heating device which comprises the IGBT and the circuit for realizing the IGBT driving pulse width limitation.
In addition, the invention also provides a cooking appliance comprising the electromagnetic heating device.
The method, the circuit and the cooking utensil for realizing the IGBT driving pulse width limitation can solve the difficult problem of PPG signal pulse width limitation margin evaluation and ensure the driving maximum pulse width limitation margin under the condition of ensuring that the cost is not increased, can also ensure the working reliability of the IGBT, reduce the fault rate of products, ensure that the products run for a long time according to the target power, and improve the user experience.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram of a circuit for implementing IGBT driving pulse width limitation according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for limiting the IGBT driving pulse width according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The method, the circuit and the cooking utensil for realizing the IGBT driving pulse width limitation can solve the difficult problem of PPG signal pulse width limitation margin evaluation, ensure the reliability of IGBT work, reduce the failure rate of products and improve the user experience under the condition of ensuring that the cost is not increased.
Fig. 1 schematically shows a block diagram of a circuit for implementing IGBT drive pulse width limiting according to an embodiment of the present invention. Referring to fig. 1, a circuit for implementing IGBT driving pulse width limitation according to an embodiment of the present invention specifically includes a main control module 10, and a voltage sampling module 20 and a current sampling module 30 connected to the main control module 10.
Wherein:
and the voltage sampling module 20 is used for detecting the power supply input voltage of the current circuit.
And the main control module 10 is configured to output a PPG signal with a preset pulse width to perform drive control on the IGBT 40.
And the current sampling module 30 is used for detecting the maximum current value of the IGBT40 in the current state.
Further, the main control module 10 is further configured to calculate a complete machine inductance of the cooking appliance according to the power input voltage detected by the voltage sampling module 20, a preset pulse width and a maximum current value detected by the current sampling module 30, and calculate a maximum limit pulse width of the IGBT driving signal according to the complete machine inductance, a maximum back pressure value allowed to be borne by the current IGBT40 and a maximum pulse current. The inductance of the whole inductor system is composed of the wire spool 50 and the inner pot 60.
Further, the main control module 10 is further configured to limit the pulse width of the output PPG signal in real time according to the maximum limit pulse width.
Specifically, the main control module 10 is specifically configured to control a pulse width of the output PPG signal to be less than or equal to the maximum limit pulse width.
The IGBT plays a switching role in the circuit, so that a parallel circuit formed by the wire spool and the resonant capacitor generates parallel resonance.
The invention provides a circuit for realizing IGBT driving pulse width limitation aiming at the problem of difficult evaluation of the pulse width limitation allowance output by a PPG driving signal of an electromagnetic heating system. The voltage sampling module, the current sampling module and the like can be realized by adopting internal circuit modules of the electromagnetic heating device of the cooking utensil without adding additional circuit modules, the difficulty in evaluating the pulse width limit allowance of the PPG signal can be solved under the condition of ensuring that the cost is not increased, the maximum pulse width limit allowance of driving is ensured, the working reliability of the IGBT is ensured, the fault rate of a product is reduced, the long-term operation of the product according to the target power is ensured, and the user experience is improved.
The different complete machine states comprise inductance tolerance of the wire spool, distance tolerance of the cookware and the wire spool, complete machine inductance variation caused by temperature and the like.
The following describes a specific method for performing adaptive pulse width limitation by using the circuit for realizing IGBT driving pulse width limitation according to the present invention.
1. Before the electromagnetic heating device operates every time, the voltage sampling module 20 obtains the power supply input voltage U0；
2. The main control module 10 outputs a preset width T0When the PPG signal is obtained, the IGBT is switched on, and the current of the winding disc is linearly increased at the moment;
3. obtaining the maximum current value I of the IGBT in the current state through the current sampling module 300I.e. the maximum value of the spool current;
4. calculating the total inductance L ═ U/dt according to the power input voltage detected by the voltage sampling module 20, the preset pulse width and the maximum current value detected by the current sampling module 30 by using the formula U ═ Ldi/dt0*T0/I0(formula 1);
5. the maximum C, E electrode withstand voltage allowed by the selected IGBT device parameters is known to be VcemaxAllowable maximum pulse current of C pole is ICpulsCalculating the maximum allowable pulse width T of PPG signal according to the formula U-Ldi/dtmax＝L*I Cpuls/Vcemax(formula 2);
6. from equation 1 and equation 2, Tmax＝U0*T0*I Cpuls/(Vcemax*I0) (formula 3);
7. the main control module 10 switches on the PPG signal for a time Ton(i.e. the pulse width of the PPG signal) is limited to: t ison≤Tmax。
In the embodiment of the present invention, the circuit for limiting the IGBT driving pulse width further includes a first filtering module 70, where the first filtering module 70 is configured to filter the power input voltage signal.
In the embodiment of the present invention, the circuit for limiting the IGBT driving pulse width further includes a rectifying module 80, and the rectifying module 80 is configured to rectify a power input voltage signal.
In the embodiment of the present invention, the circuit for limiting the IGBT driving pulse width further includes a second filtering module 90, where the second filtering module 90 is configured to rectify a power input voltage signal and provide a loop for a parallel resonant circuit formed by the wire spool 50 and the resonant capacitor 110 in the cooking appliance.
Specifically, in this embodiment, the first filtering module 70: for satisfying EMC performance; the rectifying module 80: the full-wave rectification circuit is used for full-wave rectification of mains supply; the second filtering module 90: for satisfying EMC performance and providing a return path for the parallel resonant circuit formed by the wire spool 50 and the resonant capacitor 110.
Further, the circuit further includes a sampling resistor 120, which is generally implemented by a constantan wire, and provides a sampling voltage for the current sampling module 30.
Fig. 2 schematically shows a flowchart of a method for implementing IGBT driving pulse width limitation according to an embodiment of the present invention. Referring to fig. 2, the method for implementing IGBT driving pulse width limitation according to the embodiment of the present invention specifically includes steps S11 to S14, as follows:
and S11, carrying out IGBT drive control by using a PPG signal with a preset pulse width in the initial power supply input voltage state, and detecting the current maximum value of the IGBT in the current state.
And S12, calculating the inductance of the whole machine according to the power input voltage, the preset pulse width and the detected maximum value of the current. Specifically, the inductance L of the whole machine is calculated according to the initial power input voltage, the preset pulse width and the maximum detected current value by using the formula U-Ldi/dt.
And S13, calculating the maximum limit pulse width of the IGBT driving signal according to the inductance of the whole machine, the maximum back pressure value allowed to be borne by the current IGBT and the maximum pulse current. Specifically, the maximum C, E pole back voltage value allowed by the selected IGBT device parameters is known to be VcemaxAllowable maximum pulse current of C pole is ICpulsCalculating the maximum allowable pulse width T of PPG signal according to the formula U-Ldi/dtmax＝L*I Cpuls/Vcemax。
And S14, limiting the pulse width of the output PPG signal in real time according to the maximum limit pulse width.
Wherein the real-time limiting of the pulse width of the output PPG signal according to the maximum limited pulse width further comprises:
and controlling the pulse width of the output PPG signal to be less than or equal to the maximum limit pulse width.
The method for realizing IGBT driving pulse width limitation provided by the embodiment of the invention can solve the difficult problem of PPG signal pulse width limitation margin evaluation, ensure the driving maximum pulse width limitation margin, ensure the reliability of IGBT work, reduce the failure rate of products, ensure the long-term operation of the products according to the target power and improve the user experience under the condition of ensuring that the cost is not increased.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method as described above.
In this embodiment, if the method for implementing IGBT driving pulse width limitation is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
In addition, the invention also provides an electromagnetic heating device which comprises the IGBT and the circuit for realizing the IGBT driving pulse width limitation.
In addition, the invention also provides a cooking appliance comprising the electromagnetic heating device.
The method, the circuit and the cooking utensil for realizing the IGBT driving pulse width limitation can solve the difficult problem of PPG signal pulse width limitation margin evaluation and ensure the driving maximum pulse width limitation margin under the condition of ensuring that the cost is not increased, can also ensure the working reliability of the IGBT, reduce the fault rate of products, ensure that the products run for a long time according to the target power, and improve the user experience.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, any of the claimed embodiments may be used in any combination.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a circuit that realization IGBT drive pulse width restriction, its characterized in that includes the main control module and with voltage sampling module and the current sampling module that the main control module is connected, wherein:
the voltage sampling module is used for detecting the power supply input voltage of the current circuit;
the main control module is used for outputting a PPG signal with a preset pulse width to carry out IGBT drive control;
the current sampling module is used for detecting the maximum current value of the IGBT in the current state;
the main control module is also used for calculating the complete machine inductance of the cooking appliance according to the power input voltage detected by the voltage sampling module, the preset pulse width and the maximum current value detected by the current sampling module, and calculating the maximum limit pulse width of the IGBT driving signal according to the complete machine inductance, the maximum back pressure value allowed to be borne by the current IGBT and the maximum pulse current;
and the main control module is also used for limiting the pulse width of the output PPG signal in real time according to the maximum limit pulse width.
2. The circuit according to claim 1, wherein the master control module, in particular for controlling the pulse width of the output PPG signal, is smaller than or equal to the maximum limit pulse width.
3. The circuit of claim 1 or 2, further comprising a first filtering module, wherein the first filtering module is configured to filter the power input voltage signal.
4. The circuit of claim 1 or 2, further comprising a rectification module for rectifying a power input voltage signal.
5. The circuit according to claim 1 or 2, further comprising a second filtering module for rectifying the power input voltage signal and providing a loop for a parallel resonant circuit consisting of a wire coil and a resonant capacitor in the cooking appliance.
6. A method of implementing IGBT drive pulse width limiting, the method comprising:
under the condition of initial power supply input voltage, carrying out IGBT drive control by using a PPG signal with a preset pulse width, and detecting the maximum current value of the IGBT in the current state;
calculating the inductance of the whole machine according to the power input voltage, the preset pulse width and the detected maximum value of the current;
calculating the maximum limit pulse width of an IGBT driving signal according to the inductance of the whole machine, the maximum back pressure value allowed to be borne by the current IGBT and the maximum pulse current;
and limiting the pulse width of the output PPG signal in real time according to the maximum limit pulse width.
7. The method of claim 6, wherein the real-time limiting of the pulse width of the output PPG signal according to the maximum-limited pulse width comprises:
and controlling the pulse width of the output PPG signal to be less than or equal to the maximum limit pulse width.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 6 to 7.
9. An electromagnetic heating device, characterized by comprising an IGBT and a circuit for realizing IGBT driving pulse width limitation according to any one of claims 1 to 5.
10. A cooking appliance comprising an electromagnetic heating device as claimed in claim 9.
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| CN202010940388.9A CN112003598B (en) | 2020-09-09 | 2020-09-09 | Method and circuit for realizing IGBT driving pulse width limitation and cooking appliance |
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| CN202010940388.9A CN112003598B (en) | 2020-09-09 | 2020-09-09 | Method and circuit for realizing IGBT driving pulse width limitation and cooking appliance |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944855A (en) * | 2009-07-07 | 2011-01-12 | 深圳市鑫汇科科技有限公司 | Digital control power supply converter for kitchen range |
| CN106332341A (en) * | 2016-08-30 | 2017-01-11 | 杭州信多达电器有限公司 | Software pulse width modulation drive IGBT/MOSFET device method and device |
| CN206042416U (en) * | 2016-08-30 | 2017-03-22 | 杭州信多达电器有限公司 | Device of pulsewidth modulation drive IGBTMOSFET device |
| CN107920398A (en) * | 2016-10-08 | 2018-04-17 | 佛山市顺德区美的电热电器制造有限公司 | A kind of control method and device of electromagnetic equipment, electromagnetic equipment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944855A (en) * | 2009-07-07 | 2011-01-12 | 深圳市鑫汇科科技有限公司 | Digital control power supply converter for kitchen range |
| CN106332341A (en) * | 2016-08-30 | 2017-01-11 | 杭州信多达电器有限公司 | Software pulse width modulation drive IGBT/MOSFET device method and device |
| CN206042416U (en) * | 2016-08-30 | 2017-03-22 | 杭州信多达电器有限公司 | Device of pulsewidth modulation drive IGBTMOSFET device |
| CN107920398A (en) * | 2016-10-08 | 2018-04-17 | 佛山市顺德区美的电热电器制造有限公司 | A kind of control method and device of electromagnetic equipment, electromagnetic equipment |
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