CN109951908B - Electromagnetic heating system and IGBT drive control circuit and drive control method thereof - Google Patents
Electromagnetic heating system and IGBT drive control circuit and drive control method thereof Download PDFInfo
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Abstract
The invention discloses an electromagnetic heating system and a drive control circuit and a drive control method of an IGBT (insulated gate bipolar transistor), wherein the drive control circuit comprises a drive module, a synchronous detection module, a drive voltage regulation module and a control module, the control module regulates the width of a control pulse when outputting the control pulse by using drive voltage of an amplification area, acquires the width of the current control pulse when the synchronous detection module continuously detects at least two synchronous detection signals, and superposes preset time on the width of the current control pulse to be used as the duration of the drive module for outputting the drive voltage of the amplification area, so as to control the drive module to output the drive voltage of the amplification area according to the duration in the turn-on process of the IGBT. The drive control circuit can effectively reduce the conduction loss of the IGBT and improve the reliability of the IGBT.
Description
Technical Field
The invention relates to the technical field of domestic electric appliances, in particular to a drive control circuit of an Insulated Gate Bipolar Transistor (IGBT) in an electromagnetic heating system, the electromagnetic heating system with the drive control circuit and a drive control method of the IGBT in the electromagnetic heating system.
Background
In order to solve the problem of instantaneous loss of the IGBT when the IGBT is switched on hard (the VCE voltage when the IGBT is switched on is higher), an IGBT step driving method is adopted, firstly, the IGBT step driving method is driven by an amplification region driving voltage, then, the IGBT step driving method is driven by a saturation region driving voltage, namely, firstly, the IGBT step driving method is driven by the amplification region driving voltage, and then, the V voltage of the IGBT step driving method is driven by the saturation region drivingCEThe voltage is slowly released to zero volt by limiting the current, which is equivalent to the time of dividing the instantaneous conduction loss into the conduction of the drive voltage of the amplification region, so as to reduce the instantaneous loss, and then the drive voltage of the saturation region is used for driving the IGBT.
However, when the IGBT amplification region driving voltage is discharged, the effective width of the pulse is affected by the difference in parameters between the IGBT element and the IGBT driving circuit element, and the pulse width output by the control module is different from the effective pulse width applied to the IGBT. V of IGBT if drive pulse is too narrowCEThe voltage is not released to zero volt, the drive is switched to the drive voltage of the saturation region, the instantaneous conduction loss of the IGBT is still very large, and if the drive pulse is too wide, when the V of the IGBT is too largeCEWhen the voltage is released to zero volt, the driving voltage of the amplification area is still used for driving, and the conduction loss of the IGBT can be gradually increased along with the increase of the conduction current of the IGBT.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, a first object of the present invention is to provide a drive control circuit for an IGBT in an electromagnetic heating system, which can effectively reduce the turn-on loss of the IGBT and improve the reliability of the IGBT.
A second object of the present invention is to provide an electromagnetic heating system.
The third purpose of the invention is to provide a driving control method of the IGBT in the electromagnetic heating system.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a driving control circuit for an IGBT in an electromagnetic heating system, including a driving module, a synchronous detection module, a driving voltage adjustment module, and a control module, where the synchronous detection module is connected to the control module, and the synchronous detection module is configured to detect voltages at two ends of a resonance module in the electromagnetic heating system to output a synchronous detection signal to the control module; the driving voltage adjusting module is connected with the control module and used for adjusting the driving module to respectively output a saturated region driving voltage and an amplification region driving voltage to the IGBT according to a voltage adjusting signal output by the control module, wherein the saturated region driving voltage is greater than the amplification region driving voltage; the control module is connected with the driving module and used for outputting a control pulse to the driving module so as to drive the IGBT to be switched on or switched off through the driving module, wherein when the control module outputs the control pulse through the amplification area driving voltage, the control module adjusts the width of the control pulse, obtains the width of the current control pulse when the synchronous detection module continuously detects at least two synchronous detection signals, and superposes preset time on the width of the current control pulse to serve as the duration of the driving module for outputting the amplification area driving voltage, so that the driving module is controlled to output the amplification area driving voltage according to the duration in the switching-on process of the IGBT.
According to the drive control circuit of the IGBT in the electromagnetic heating system, disclosed by the embodiment of the invention, when the control module outputs the control pulse according to the drive voltage of the amplification area, the width of the control pulse is adjusted, the width of the current control pulse is obtained when the synchronous detection module continuously detects at least two synchronous detection signals, and the preset time is superposed on the width of the current control pulse to be used as the duration of the drive module for outputting the drive voltage of the amplification area, so that the drive module is controlled to output the drive voltage of the amplification area according to the duration in the turn-on process of the IGBT, the conduction loss of the IGBT can be effectively reduced, and the reliability of the IGBT is improved.
According to one embodiment of the invention, the control module increases the width of the control pulse every first preset time by taking the preset time as an amplification so as to adjust the width of the control pulse.
According to an embodiment of the present invention, the preset time is a fixed value, wherein the preset time is greater than or equal to 1 microsecond and less than or equal to 6 microseconds.
According to an embodiment of the present invention, the preset time is a gradual change value, wherein the preset time gradually increases from a zero crossing point of the input ac mains supply to a peak and gradually decreases from the peak to the zero crossing point of the input ac mains supply.
According to an embodiment of the invention, the preset time is determined according to a voltage of the input ac mains or an output power of the electromagnetic heating system.
In order to achieve the above object, a second embodiment of the present invention provides an electromagnetic heating system, which includes a driving control circuit of an IGBT in the electromagnetic heating system.
According to the electromagnetic heating system provided by the embodiment of the invention, through the drive control circuit of the IGBT in the electromagnetic heating system, when the IGBT generates resonance, the control pulse width when the synchronous signal is detected is added with a certain value to be used as the pulse width of the drive voltage of the amplification area, so that the drive voltage of the amplification area is ensured to be in the control interval, the conduction loss of the IGBT is effectively reduced, and the reliability of the IGBT is improved.
In order to achieve the above object, a third embodiment of the present invention provides a driving control method for an IGBT in an electromagnetic heating system, where a driving control circuit for the IGBT includes a driving module, a synchronous detection module, a driving voltage adjustment module, and a control module, the synchronous detection module is connected to the control module, the synchronous detection module is configured to detect voltages at two ends of a resonance module in the electromagnetic heating system to output synchronous detection signals to the control module, the driving voltage adjustment module is connected to the control module, the driving voltage adjustment module is configured to adjust the driving module to output a driving voltage in a saturation region and a driving voltage in an amplification region to the IGBT respectively according to a voltage adjustment signal output by the control module, the control module is connected to the driving module, the control module is configured to output a control pulse to the driving module to drive the IGBT to turn on or turn off through the driving module, wherein the saturation region drive voltage is greater than the amplification region drive voltage, the method comprising: when the control module outputs the control pulse by the driving voltage of the amplification area, the width of the control pulse is adjusted, and the width of the current control pulse is obtained when the synchronous detection module continuously detects at least two synchronous detection signals; superposing preset time on the basis of the width of the current control pulse to serve as the duration of the driving module for outputting the driving voltage of the amplification area; and controlling the driving module to output the driving voltage of the amplification area according to the duration in the turn-on process of the IGBT.
According to the drive control method of the IGBT in the electromagnetic heating system, the control module adjusts the width of the control pulse when outputting the control pulse by the drive voltage of the amplification area, obtains the width of the current control pulse when the synchronous detection module continuously detects at least two synchronous detection signals, superposes the preset time on the basis of the width of the current control pulse to be used as the duration of the drive voltage of the amplification area output by the drive module, and controls the drive module to output the drive voltage of the amplification area according to the duration in the turn-on process of the IGBT, so that the conduction loss of the IGBT can be effectively reduced, and the reliability of the IGBT is improved.
According to one embodiment of the invention, the control module increases the width of the control pulse every first preset time by taking the preset time as an amplification so as to adjust the width of the control pulse.
According to an embodiment of the present invention, the preset time is greater than or equal to 1 microsecond and less than or equal to 6 microseconds.
According to an embodiment of the present invention, the preset time gradually increases from a zero-crossing point of the input ac mains supply to a peak, and gradually decreases from the peak to the zero-crossing point of the input ac mains supply.
According to an embodiment of the invention, the preset time is determined according to a voltage of the input ac mains or an output power of the electromagnetic heating system.
Drawings
Fig. 1 is a schematic configuration diagram of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention;
FIG. 2 is a graph of a synchronization detection signal according to one embodiment of the present invention;
fig. 3 is a waveform diagram of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention;
FIG. 4 is a block schematic diagram of an electromagnetic heating system according to one embodiment of the present invention;
fig. 5 is a flowchart of a drive control method of an IGBT in an electromagnetic heating system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A drive control circuit of an IGBT in an electromagnetic heating system, an electromagnetic heating system having the drive control circuit, and a drive control method of an IGBT in an electromagnetic heating system proposed according to an embodiment of the present invention are described below with reference to the drawings.
In the embodiment of the invention, the electromagnetic heating system can be an electromagnetic heating product such as an electromagnetic oven, an electromagnetic rice cooker, an electromagnetic pressure cooker and the like.
Fig. 1 is a schematic structural diagram of a drive control circuit of an IGBT in an electromagnetic heating system according to an embodiment of the present invention. As shown in fig. 1, the drive control circuit of the IGBT in the electromagnetic heating system according to the embodiment of the present invention may include: a driving module 10, a synchronous detection module 20, a driving voltage adjustment module 30 and a control module 40.
The synchronous detection module 20 is connected to the control module 40, and the synchronous detection module 20 is configured to detect voltages at two ends of the resonance module 50 in the electromagnetic heating system to output a synchronous detection signal to the control module 40. For example, the resonance module 50 may include a resonance capacitor 51 and a heating coil 52 connected in parallel, the voltage across the resonance module 50 refers to the voltage across the resonance capacitor 51 and the heating coil 52 connected in parallel, that is, the voltages at points a and B in the figure, and the synchronous detection module 20 detects the voltages at points a and B to output a synchronous detection signal to the control module 40.
The driving voltage adjusting module 30 is connected to the control module 40, and the driving voltage adjusting module 30 is configured to adjust the driving module 10 to output a saturation region driving voltage and an amplification region driving voltage to the IGBT respectively according to a voltage adjusting signal output by the control module 40, where the saturation region driving voltage is greater than the amplification region driving voltage. For example, when the control module 40 outputs a first voltage adjustment signal (e.g., a high level signal) to the driving voltage adjustment module 30, the driving voltage adjustment module 30 adjusts the driving module 10 to output a saturation region driving voltage (e.g., 18V) to the IGBT according to the adjustment signal; when the control module 40 outputs a second voltage adjustment signal (e.g., a low level signal) to the driving voltage adjustment module 30, the driving voltage adjustment module 30 adjusts the driving module 10 to output an amplification region driving voltage (e.g., 10V) to the IGBT according to the adjustment signal.
The control module 40 is connected to the driving module 10, and the control module 40 is configured to output a control pulse to the driving module 10 to drive the IGBT to turn on or turn off through the driving module 10, where when the control module 40 outputs the control pulse with the amplification region driving voltage, the control module 40 adjusts the width of the control pulse, obtains the width of the current control pulse when the synchronous detection module 20 continuously detects at least two synchronous detection signals, and superimposes a preset time on the width of the current control pulse to be used as a duration for the driving module 10 to output the amplification region driving voltage, so as to control the driving module 10 to output the amplification region driving voltage according to the duration in the IGBT turning-on process.
The preset time may be a fixed value, for example, the preset time is greater than or equal to 1 microsecond and less than or equal to 6 microseconds.
The preset time may be a gradual change value, wherein the preset time gradually increases from a zero crossing point of the input ac mains supply to a peak, and gradually decreases from the peak to the zero crossing point of the input ac mains supply. That is to say, the preset time gradually increases from the zero crossing point of the alternating current commercial power to the peak, and gradually decreases from the peak to the zero crossing point of the alternating current commercial power, and the preset time is greater than or equal to 0 microsecond and less than or equal to 6 microseconds.
The preset time can be a variable value and can be determined according to the voltage of the input alternating current commercial power or the output power of the electromagnetic heating system. For example, when the voltage of the ac utility power is higher than the rated voltage, the set value of the preset time is larger, and when the voltage of the ac utility power is lower than the rated voltage, the set value of the preset time is smaller, and the preset time is greater than or equal to 0 microsecond and less than or equal to 6 microseconds. For another example, when the output power of the electromagnetic heating system is higher than the rated power, the set value of the preset time is smaller, and when the output power of the electromagnetic heating system is lower than the rated power, the set value of the preset time is larger, and the preset time is greater than or equal to 0 microsecond and less than or equal to 6 microseconds.
Specifically, as shown in fig. 1, after the electromagnetic heating system is powered on and operated, the first filtering module 80 firstly filters the ac mains power input by the ac power supply 70, and the rectifying module 90 firstly converts the processed ac mains power into pulsed dc power, and then outputs stable dc voltage to the resonant tank after filtering through the second filtering module 100 and the smoothing filtering capacitor 110. The control module 40 outputs a driving voltage adjusting signal to the driving voltage adjusting module 30 through the voltage adjusting output terminal, and outputs a control pulse to the driving module 10, and the driving module 10 performs driving control on the IGBT according to the signal and the control pulse signal output by the driving voltage adjusting module 30. In addition, the electromagnetic heating system may further include a zero-crossing detection module 60, configured to detect a zero-crossing signal of the ac mains to determine the preset time according to the zero-crossing signal.
In the working process of the electromagnetic heating system, a second voltage adjusting signal (e.g. a low level signal) may be output to the driving voltage adjusting module 30 to adjust the driving module 10 to output the amplification region driving voltage to the IGBT, and the control module 40 outputs a control pulse to the driving module 10 to drive the IGBT to turn on or turn off through the driving module 10, when the IGBT is turned on or turned off, the voltage across the heating coil 52 changes abruptly to generate resonance, and the heating coil 52 performs resonance heating. In this process, the control module 40 further obtains the synchronous detection signal in real time through the synchronous detection module 20, wherein when obtaining the synchronous detection signal, since the voltage change at the point B in the resonance process is not obvious, and the voltage at the point a has a sudden change, the synchronous detection signal and the resonance voltage when the resonance module 50 performs the resonance operation can be obtained according to the voltage change degree at the point a (i.e., the resonance amplitude at the point a). As shown in fig. 2, when the voltage at the point a varies greatly, the voltage difference between the point a and the point B is large, and the synchronization detection signal is obtained at this time. When the control module 40 obtains two or more consecutive synchronization detection signals, the width of the control pulse output by the control module 40 when the recording synchronization detection module 20 detects the first synchronization detection signal can be represented by time t 2.
Then, as shown in fig. 3, the control module 40 superimposes a preset time Δ t, i.e., t2+ Δ t, on the basis of the width of the present control pulse as the duration for which the driving module 10 outputs the amplification region driving voltage. In the turn-on process of the IGBT, the control module 40 controls the driving module 10 to output the amplification region driving voltage according to the acquired duration.
Therefore, V of the IGBT can be effectively prevented when the duration time of the drive voltage of the amplification region is too shortCEWhen the voltage is not released to zero volt, the IGBT is switched to the driving voltage in the saturation region to drive, so that the instantaneous conduction loss of the IGBT is overlarge, or when the duration of the driving voltage in the amplification region is overlong, the V of the IGBT isCEThe voltage is released to zero volt, the IGBT conduction current is increased due to the fact that the amplification region driving voltage is still used for driving, and the IGBT conduction loss is gradually increased. Therefore, the driving voltage of the amplification area can be ensured to be in the control area, the conduction loss of the IGBT is effectively reduced, and the reliability of the IGBT is improved.
Further, according to an embodiment of the present invention, the control module 40 increases the width of the control pulse every first preset time with the preset time as an amplification to adjust the width of the control pulse. The first preset time can be calibrated according to actual conditions.
Specifically, as shown in fig. 2, the control module 40 outputs the second voltage adjustment signal to the driving voltage adjustment module 30 first, at this time, the driving voltage adjustment module 30 adjusts the driving module 10 to output the amplification region driving voltage, and at the same time, the control module 40 outputs the control pulse with the width t0 to the driving module 10, and from t0, the width of the control pulse is increased by Δ t every first preset time t 1. As the control pulse width increases, the current for driving the IGBT to conduct becomes larger, the resonance amplitude becomes larger, and when the resonance amplitude reaches a certain level, the synchronous detection module 20 will obtain a synchronous detection signal by detecting the voltages at the points a and B. When the synchronous detection signal is obtained for the first time, the width of the control pulse is not increased, and at the same time, the control module 40 continues to obtain whether the synchronous detection signal exists, and if the synchronous detection signal is obtained for a plurality of times (interference is eliminated), the width of the control pulse at this time is recorded and is represented by time t2, and the output of the control pulse is stopped.
It should be noted that the preset time in the embodiment of the present invention may be a fixed value, a gradual change value, or a change value, and the width of the control pulse is adjusted in the same manner, which is not described in detail here.
In summary, according to the drive control circuit of the IGBT in the electromagnetic heating system in the embodiment of the invention, when the control module outputs the control pulse with the amplification area drive voltage, the width of the control pulse is adjusted, the width of the current control pulse is obtained when the synchronous detection module continuously detects at least two synchronous detection signals, and the preset time is superimposed on the width of the current control pulse to serve as the duration of the drive module outputting the amplification area drive voltage, so that the drive module is controlled to output the amplification area drive voltage according to the duration in the turn-on process of the IGBT, thereby effectively reducing the conduction loss of the IGBT and improving the reliability of the IGBT.
Fig. 4 is a block schematic diagram of an electromagnetic heating system according to one embodiment of the present invention. As shown in fig. 4, an electromagnetic heating system 1000 according to an embodiment of the present invention may include a driving control circuit 1100 of an IGBT in the electromagnetic heating system described above.
According to the electromagnetic heating system provided by the embodiment of the invention, through the drive control circuit of the IGBT in the electromagnetic heating system, when the IGBT generates resonance, the control pulse width when the synchronous signal is detected and a certain value are added to be used as the pulse width of the drive voltage of the amplification area, so that the drive voltage of the amplification area is ensured to be in a control interval, the conduction loss of the IGBT is effectively reduced, and the reliability of the IGBT is improved.
Fig. 5 is a flowchart of a drive control method of an IGBT in an electromagnetic heating system according to an embodiment of the present invention.
In an embodiment of the invention, a driving control circuit of an IGBT includes a driving module, a synchronous detection module, a driving voltage regulation module and a control module, the synchronous detection module is connected with the control module, the synchronous detection module is used for detecting voltages at two ends of a resonance module in an electromagnetic heating system to output synchronous detection signals to the control module, the driving voltage regulation module is connected with the control module, the driving voltage regulation module is used for regulating the driving module to respectively output a saturation region driving voltage and an amplification region driving voltage to the IGBT according to the voltage regulation signals output by the control module, the control module is connected with the driving module, and the control module is used for outputting control pulses to the driving module to drive the IGBT to be turned on or turned off through the driving module, wherein the saturation region driving voltage is greater than the amplification region driving voltage.
As shown in fig. 5, the method for controlling driving of an IGBT in an electromagnetic heating system according to an embodiment of the present invention may include the steps of:
and S1, when the control module outputs the control pulse by the drive voltage of the amplification area, adjusting the width of the control pulse, and acquiring the width of the current control pulse when the synchronous detection module continuously detects at least two synchronous detection signals.
And S2, superposing a preset time on the basis of the width of the current control pulse to serve as the duration of the driving module for outputting the driving voltage of the amplification region.
And S3, controlling the driving module to output the driving voltage of the amplification region according to the duration in the turn-on process of the IGBT.
According to one embodiment of the invention, the control module increases the width of the control pulse by a preset time as an amplification every first preset time so as to adjust the width of the control pulse.
According to an embodiment of the present invention, the preset time is greater than or equal to 1 microsecond and less than or equal to 6 microseconds.
According to an embodiment of the present invention, the preset time is a gradual change value, wherein the preset time gradually increases from a zero crossing point of the input ac mains supply to a peak and gradually decreases from the peak to the zero crossing point of the input ac mains supply.
According to an embodiment of the invention, the preset time is determined according to a voltage of the input ac mains or an output power of the electromagnetic heating system.
It should be noted that details that are not disclosed in the method for driving and controlling the IGBT in the electromagnetic heating system according to the embodiment of the present invention refer to details disclosed in the circuit for driving and controlling the IGBT in the electromagnetic heating system according to the embodiment of the present invention, and are not described herein again in detail.
According to the drive control method of the IGBT in the electromagnetic heating system, the control module adjusts the width of the control pulse when outputting the control pulse by the drive voltage of the amplification area, obtains the width of the current control pulse when the synchronous detection module continuously detects at least two synchronous detection signals, superposes the preset time on the basis of the width of the current control pulse to be used as the duration of the drive voltage of the amplification area output by the drive module, and controls the drive module to output the drive voltage of the amplification area according to the duration in the turn-on process of the IGBT, so that the conduction loss of the IGBT can be effectively reduced, and the reliability of the IGBT is improved.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. A drive control circuit of IGBT in electromagnetic heating system is characterized in that the drive control circuit comprises a drive module, a synchronous detection module, a drive voltage regulation module and a control module, wherein,
the synchronous detection module is connected with the control module and is used for detecting the voltage at two ends of the resonance module in the electromagnetic heating system so as to output a synchronous detection signal to the control module;
the driving voltage adjusting module is connected with the control module and used for adjusting the driving module to respectively output a saturated region driving voltage and an amplification region driving voltage to the IGBT according to a voltage adjusting signal output by the control module, wherein the saturated region driving voltage is greater than the amplification region driving voltage;
the control module is connected with the driving module and is used for outputting control pulses to the driving module so as to drive the IGBT to be switched on or switched off through the driving module, wherein,
the control module adjusts the width of the control pulse when outputting the control pulse by the amplification area driving voltage, acquires the width of the current control pulse when the synchronous detection module continuously detects at least two synchronous detection signals, and superposes preset time on the width of the current control pulse to serve as the duration of the driving module outputting the amplification area driving voltage, so as to control the driving module to output the amplification area driving voltage according to the duration in the turn-on process of the IGBT.
2. The drive control circuit of the IGBT in the electromagnetic heating system according to claim 1, wherein the control module increases the width of the control pulse every first preset time by the preset time as an amplification to adjust the width of the control pulse.
3. The drive control circuit of the IGBT in the electromagnetic heating system according to claim 1 or 2, wherein the preset time is a fixed value, wherein the preset time is 1 microsecond or more and 6 microseconds or less.
4. The drive control circuit of the IGBT in the electromagnetic heating system according to claim 1 or 2, wherein the preset time is a gradual value, wherein the preset time is gradually increased from a zero-crossing point of the input ac commercial power to a peak and is gradually decreased from the peak to the zero-crossing point of the input ac commercial power.
5. The drive control circuit of the IGBT in the electromagnetic heating system according to claim 1 or 2, wherein the preset time is determined according to a voltage of an input ac commercial power or an output power of the electromagnetic heating system.
6. An electromagnetic heating system, characterized by comprising a drive control circuit of an IGBT in the electromagnetic heating system according to any one of claims 1 to 5.
7. A driving control method of an IGBT in an electromagnetic heating system is characterized in that the electromagnetic heating system comprises a driving control circuit of the IGBT, the driving control circuit of the IGBT comprises a driving module, a synchronous detection module, a driving voltage adjusting module and a control module, the synchronous detection module is connected with the control module and is used for detecting voltages at two ends of a resonance module in the electromagnetic heating system so as to output synchronous detection signals to the control module, the driving voltage adjusting module is connected with the control module and is used for adjusting the driving module to respectively output driving voltages of a saturation region and an amplification region to the IGBT according to voltage adjusting signals output by the control module, the control module is connected with the driving module and is used for outputting control pulses to the driving module so as to drive the IGBT to be turned on or turned off through the driving module, wherein the saturation region drive voltage is greater than the amplification region drive voltage, the method comprising:
when the control module outputs the control pulse by the driving voltage of the amplification area, the width of the control pulse is adjusted, and the width of the current control pulse is obtained when the synchronous detection module continuously detects at least two synchronous detection signals;
superposing preset time on the basis of the width of the current control pulse to serve as the duration of the driving module for outputting the driving voltage of the amplification area;
and controlling the driving module to output the driving voltage of the amplification area according to the duration in the turn-on process of the IGBT.
8. The method of claim 7, wherein the control module increases the width of the control pulse every first predetermined time in increments of the predetermined time to adjust the width of the control pulse.
9. The method according to claim 7 or 8, wherein the preset time is a fixed value, wherein the preset time is greater than or equal to 1 microsecond and less than or equal to 6 microseconds.
10. The method according to claim 7 or 8, wherein the preset time is a gradual value, wherein the preset time is gradually increased from a zero crossing point of the input AC mains to a peak and gradually decreased from the peak to the zero crossing point of the input AC mains.
11. The method of claim 7 or 8, wherein the preset time is determined according to a voltage of an input AC mains or an output power of the electromagnetic heating system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711390493.4A CN109951908B (en) | 2017-12-21 | 2017-12-21 | Electromagnetic heating system and IGBT drive control circuit and drive control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711390493.4A CN109951908B (en) | 2017-12-21 | 2017-12-21 | Electromagnetic heating system and IGBT drive control circuit and drive control method thereof |
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