CN112543525A - Self-adaptive frequency modulation method and system for medium-frequency induction heating furnace - Google Patents
Self-adaptive frequency modulation method and system for medium-frequency induction heating furnace Download PDFInfo
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- CN112543525A CN112543525A CN202011466007.4A CN202011466007A CN112543525A CN 112543525 A CN112543525 A CN 112543525A CN 202011466007 A CN202011466007 A CN 202011466007A CN 112543525 A CN112543525 A CN 112543525A
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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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- Y02P10/00—Technologies related to metal processing
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Abstract
The application discloses self-adaptive frequency modulation method and system for an intermediate frequency induction heating furnace, and the compensation capacitor group with at least two compensation capacitors can be changed into other compensation capacitors or the current compensation capacitors to be adjusted when the current compensation capacitors need to be adjusted, so that the adjustment frequency value obtained by adjusting the adjustment capacitance value of the compensation capacitors, the load equivalent resistance value and the inductance value is equal to the preset frequency value, and the condition that the intermediate frequency induction heating furnace cannot be used under the condition that a single compensation capacitor does not meet the frequency requirement is avoided. The method comprises the following steps: acquiring a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace; judging whether the current compensation capacitor in the compensation capacitor group needs to be adjusted or not according to the load equivalent resistance value, the inductance value and the preset frequency value; when the current compensation capacitor needs to be adjusted, the capacitor is adjusted to obtain an adjusted compensation capacitor, so that an adjustment frequency value obtained by adjusting the capacitance value, the load equivalent resistance value and the inductance value is equal to a preset frequency value.
Description
Technical Field
The invention relates to the field of circuits, in particular to a self-adaptive frequency modulation method and a self-adaptive frequency modulation system for an intermediate frequency induction heating furnace.
Background
The coil of the medium-frequency power supply of a common induction furnace is designed in advance, and a power supply manufacturer calculates a corresponding compensation capacitance value according to coil load parameters so as to achieve a pre-designed frequency value.
However, due to the calculation deviation or the problem of mounting materials, the actual parameters of the coil deviate from the calculated values, and the compensation capacitor should be adjusted accordingly.
The conventional compensation capacitor adjusting mode generally adjusts the distance between pole plates and the positive area of the pole plates of the compensation capacitor, but the adjustment requirement of a single compensation capacitor still cannot be met, so that the induction furnace cannot be used.
Disclosure of Invention
The invention aims to provide a self-adaptive frequency modulation method and a self-adaptive frequency modulation system for an intermediate frequency induction heating furnace, wherein a compensation capacitor group with at least two compensation capacitors can be changed into other compensation capacitors or the current compensation capacitor can be adjusted when the current compensation capacitor needs to be adjusted, so that an adjustment frequency value obtained by adjusting an adjustment capacitance value of the compensation capacitor, a load equivalent resistance value and an inductance value is equal to a preset frequency value, and the condition that the intermediate frequency induction heating furnace cannot be used under the condition that a single compensation capacitor does not meet the frequency requirement is avoided.
The invention provides a self-adaptive frequency modulation method of an intermediate frequency induction heating furnace, which comprises the following steps:
acquiring a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace;
judging whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted or not according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitor bank comprises at least two compensation capacitors;
when the current compensation capacitor needs to be adjusted, the capacitor is adjusted to obtain an adjusted compensation capacitor, so that an adjustment frequency value obtained by adjusting an adjustment capacitance value of the compensation capacitor, a load equivalent resistance value and an inductance value is equal to a preset frequency value.
Further, according to the load equivalent resistance value, the inductance value and the preset frequency value, it is determined whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted, including:
calculating to obtain a preset capacitance value according to the load equivalent resistance value, the inductance value and a preset frequency value;
acquiring a compensation capacitance value of each compensation capacitor in the compensation capacitor group, and determining a current compensation capacitance value of a current compensation capacitor;
judging whether the current compensation capacitance value is equal to a preset capacitance value or not;
if so, determining that the current compensation capacitor does not need to be adjusted;
and if not, determining that the current compensation capacitor needs to be adjusted.
Further, the adjusting the capacitance to obtain an adjusted compensation capacitance includes:
judging whether the compensation capacitance value of the first compensation capacitor in the compensation capacitor group is equal to a preset capacitance value or not;
if a first compensation capacitor exists, replacing the current compensation capacitor with the first standard compensation capacitor to serve as an adjusting compensation capacitor;
if at least two first compensation capacitors exist, one of the at least two first compensation capacitors is randomly selected as an adjustment compensation capacitor, and the current compensation capacitor is replaced by the adjustment compensation capacitor;
if not, acquiring the process parameters of the current compensation capacitor, adjusting the process parameters of the current compensation capacitor to obtain an adjusted compensation capacitor, wherein the capacitance value of the adjusted compensation capacitor is equal to the preset capacitance value.
Further, acquiring a process parameter of the current compensation capacitor, and adjusting the process parameter of the current compensation capacitor to obtain an adjusted compensation capacitor, including:
acquiring technological parameters of the current compensation capacitor, wherein the technological parameters comprise the distance between polar plates and the positive facing area of the polar plates;
and adjusting the distance between the polar plates and/or the positive facing area of the polar plates of the current compensation capacitor to obtain an adjusted compensation capacitor, wherein the capacitance value of the adjusted compensation capacitor is equal to the preset capacitance value.
Furthermore, the technological parameters also comprise a spacing adjustment limiting range and an area adjustment limiting range,
adjusting the plate spacing and/or the plate dead area of the current compensation capacitor, and before the adjustment of the compensation capacitor, the method further comprises:
judging whether the adjustment range of the electrode plate distance of the current compensation capacitor exceeds the distance adjustment limit range or not;
if the distance adjustment limiting range is exceeded, selecting a first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, and after the electrode plate distance and the electrode plate dead-facing area of the first adjustable compensation capacitor are adjusted, the capacitance value of the first adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the first adjustable compensation capacitor;
if the adjustment range of the positive facing area of the polar plate of the current compensation capacitor does not exceed the spacing adjustment limit range, judging whether the adjustment range of the positive facing area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range;
if the area adjustment limiting range is exceeded, selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, and after the electrode plate distance and the electrode plate dead-against area of the second adjustable compensation capacitor are adjusted, the capacitance value of the second adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the second adjustable compensation capacitor;
and if the area adjustment limit range is not exceeded, determining that the current compensation capacitor is adjustable.
The invention provides a self-adaptive frequency modulation system of an intermediate frequency induction heating furnace, which comprises:
the device comprises an intermediate frequency induction heating furnace, a controller and a compensation capacitor set, wherein the compensation capacitor set is adjustable and comprises at least two compensation capacitors;
the controller is used for acquiring a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace;
the controller is further used for judging whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted or not according to the load equivalent resistance value, the inductance value and the preset frequency value, and the compensation capacitor bank comprises at least two compensation capacitors;
and the controller is also used for adjusting the capacitance to obtain an adjusted compensation capacitor when the current compensation capacitor needs to be adjusted, so that an adjusted frequency value obtained by adjusting the adjusted capacitance value of the compensation capacitor, the load equivalent resistance value and the inductance value is equal to the preset frequency value.
Further, in the above-mentioned case,
the controller is further used for calculating to obtain a preset capacitance value according to the load equivalent resistance value, the inductance value and the preset frequency value;
the controller is further used for acquiring the compensation capacitance value of each compensation capacitor in the compensation capacitor group and determining the current compensation capacitance value of the current compensation capacitor;
the controller is also used for judging whether the current compensation capacitance value is equal to a preset capacitance value or not;
the controller is also used for determining that the current compensation capacitor does not need to be adjusted if the current compensation capacitor is equal to the current compensation capacitor;
and the controller is also used for determining that the current compensation capacitor needs to be adjusted if the current compensation capacitor is not equal to the current compensation capacitor.
Further, in the above-mentioned case,
the controller is also used for judging whether the compensation capacitance value of the first compensation capacitor in the compensation capacitor group is equal to a preset capacitance value;
the controller is also used for replacing the current compensation capacitor with the first standard compensation capacitor to serve as an adjusting compensation capacitor if the first compensation capacitor exists;
the controller is further used for randomly selecting one of the at least two first compensation capacitors as an adjustment compensation capacitor if the at least two first compensation capacitors exist, and replacing the current compensation capacitor with the adjustment compensation capacitor;
and the controller is also used for acquiring the process parameters of the current compensation capacitor and adjusting the process parameters of the current compensation capacitor to obtain an adjusted compensation capacitor if the current compensation capacitor does not exist, wherein the capacitance value of the adjusted compensation capacitor is equal to the preset capacitance value.
Further, in the above-mentioned case,
the controller is also used for acquiring the technological parameters of the current compensation capacitor, and the technological parameters comprise the distance between the polar plates and the dead-against area of the polar plates;
and the controller is also used for adjusting the distance between the polar plates and/or the positive facing area of the polar plates of the current compensation capacitor to obtain an adjusted compensation capacitor, and the capacitance value of the adjusted compensation capacitor is equal to the preset capacitance value.
Furthermore, the technological parameters also comprise a spacing adjustment limiting range and an area adjustment limiting range,
the controller is also used for judging whether the adjustment range of the electrode plate distance of the current compensation capacitor exceeds the distance adjustment limit range or not;
the controller is further used for selecting a first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor if the distance adjustment limiting range is exceeded, and after the electrode plate distance and the positive electrode plate area of the first adjustable compensation capacitor are adjusted, the capacitance value of the first adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the first adjustable compensation capacitor;
the controller is also used for judging whether the adjustment range of the positive facing area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range or not if the adjustment range of the positive facing area of the polar plate of the current compensation capacitor does not exceed the interval adjustment limit range;
the controller is further used for selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor if the area adjustment limit range is exceeded, and after the electrode plate distance and the electrode plate dead-against area of the second adjustable compensation capacitor are adjusted, the capacitance value of the second adjustable compensation capacitor is equal to the preset capacitance value and does not exceed the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor;
and the controller is also used for determining that the current compensation capacitor is adjustable if the area adjustment limit range is not exceeded.
Therefore, the self-adaptive frequency modulation method of the medium-frequency induction heating furnace obtains the load equivalent resistance value, the inductance value and the preset frequency value of the medium-frequency induction heating furnace, judges whether the current compensation capacitor in the compensation capacitor group needs to be adjusted or not according to the load equivalent resistance value, the inductance value and the preset frequency value, the compensation capacitor group comprises at least two compensation capacitors, when the current compensation capacitor needs to be adjusted, the capacitor is adjusted to obtain the adjusted compensation capacitor, and the adjusted capacitance value of the adjusted compensation capacitor, the load equivalent resistance value and the adjusted frequency value obtained by adjusting the inductance value are equal to the preset frequency value. Compared with the prior art, the compensation capacitor group with at least two compensation capacitors can be changed into other compensation capacitors or the current compensation capacitor can be adjusted when the current compensation capacitor needs to be adjusted, the adjustment frequency value obtained by adjusting the adjustment capacitance value of the compensation capacitor, the load equivalent resistance value and the inductance value is equal to the preset frequency value, and the condition that the medium-frequency induction heating furnace cannot be used under the condition that a single compensation capacitor does not meet the frequency requirement is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of an adaptive frequency modulation method for an intermediate frequency induction heating furnace according to the present invention;
FIG. 2 is a schematic flow chart of another embodiment of an adaptive frequency modulation method for an intermediate frequency induction heating furnace according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of an adaptive frequency modulation system of an intermediate frequency induction heating furnace provided by the invention.
Detailed Description
The invention provides a self-adaptive frequency modulation method and a self-adaptive frequency modulation system for an intermediate frequency induction heating furnace, wherein a compensation capacitor group with at least two compensation capacitors can be changed into other compensation capacitors or the current compensation capacitor can be adjusted when the current compensation capacitor needs to be adjusted, so that an adjustment frequency value obtained by adjusting an adjustment capacitance value of the compensation capacitor, a load equivalent resistance value and an inductance value is equal to a preset frequency value, and the condition that the intermediate frequency induction heating furnace cannot be used under the condition that a single compensation capacitor does not meet the frequency requirement is avoided.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes 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 "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; 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 addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the invention provides an adaptive frequency modulation method for an intermediate frequency induction heating furnace, including:
101. acquiring a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace;
in this embodiment, the coil of the if power supply of the if induction heating furnace is designed in advance, and the power supply manufacturer calculates the corresponding compensation capacitance value according to the coil load parameter, so as to reach the pre-designed frequency value, and therefore, the load equivalent resistance value, the inductance value, and the preset frequency value can be obtained according to factory settings.
102. Judging whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted or not according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitor bank comprises at least two compensation capacitors; if yes, go to step 103;
in this embodiment, the expression
f represents a preset frequency value, L represents an inductance value, and pi is a constant, the capacitance value of the current compensation capacitor needs to satisfy the capacitance value C obtained by formula calculation, whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted is judged, and if the current compensation capacitor needs to be adjusted, step 103 is executed.
103. And adjusting the capacitance to obtain an adjusted compensation capacitor, so that an adjusted frequency value obtained by adjusting the adjusted capacitance value of the compensation capacitor, the load equivalent resistance value and the inductance value is equal to a preset frequency value.
In this embodiment, since the compensation capacitor bank has at least two compensation capacitors, it can be specifically set as a switching capacitor bank, and when the current compensation capacitor needs to be adjusted, the current compensation capacitor can be changed into another compensation capacitor or the current compensation capacitor itself is adjusted, so that an adjustment frequency value obtained by adjusting an adjustment capacitance value of the compensation capacitor, a load equivalent resistance value, and an inductance value is equal to a preset frequency value.
In the embodiment of the invention, the load equivalent resistance value, the inductance value and the preset frequency value of the medium-frequency induction heating furnace are obtained, whether the current compensation capacitor in the compensation capacitor set needs to be adjusted or not is judged according to the load equivalent resistance value, the inductance value and the preset frequency value, the compensation capacitor set comprises at least two compensation capacitors, when the current compensation capacitor needs to be adjusted, the capacitor is adjusted to obtain the adjusted compensation capacitor, and the adjusted capacitance value of the adjusted compensation capacitor, the load equivalent resistance value and the inductance value are enabled to be equal to the preset frequency value. Compared with the prior art, the compensation capacitor group with at least two compensation capacitors can be changed into other compensation capacitors or the current compensation capacitor can be adjusted when the current compensation capacitor needs to be adjusted, the adjustment frequency value obtained by adjusting the adjustment capacitance value of the compensation capacitor, the load equivalent resistance value and the inductance value is equal to the preset frequency value, and the condition that the medium-frequency induction heating furnace cannot be used under the condition that a single compensation capacitor does not meet the frequency requirement is avoided.
Optionally, according to the embodiment shown in fig. 1, in some embodiments of the present invention, determining whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted according to the load equivalent resistance value, the inductance value, and the preset frequency value includes:
calculating to obtain a preset capacitance value according to the load equivalent resistance value, the inductance value and a preset frequency value;
acquiring a compensation capacitance value of each compensation capacitor in the compensation capacitor group, and determining a current compensation capacitance value of a current compensation capacitor;
judging whether the current compensation capacitance value is equal to a preset capacitance value or not;
if so, determining that the current compensation capacitor does not need to be adjusted;
and if not, determining that the current compensation capacitor needs to be adjusted.
In the embodiment of the present invention, the preset capacitance value is calculated according to the load equivalent resistance value, the inductance value and the preset frequency value, the compensation capacitance value of each compensation capacitor in the compensation capacitor group is obtained, and the current compensation capacitance value of the current compensation capacitor is determined, where the compensation capacitance value of each compensation capacitor in the compensation capacitor group may be obtained by directly adopting factory settings or by performing real-time measurement. Judging whether the current compensation capacitance value is equal to a preset capacitance value or not; if so, determining that the current compensation capacitor does not need to be adjusted; and if not, determining that the current compensation capacitor needs to be adjusted.
Referring to fig. 2, an embodiment of the invention provides an adaptive frequency modulation method for an intermediate frequency induction heating furnace, including:
201. acquiring a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace;
202. judging whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted or not according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitor bank comprises at least two compensation capacitors; if yes, go to step 203;
203. judging whether the compensation capacitance value of the first compensation capacitor in the compensation capacitor group is equal to a preset capacitance value or not;
in this embodiment, it is determined whether the compensation capacitor set has a compensation capacitance value of the first compensation capacitor equal to the preset capacitance value, and if only one first compensation capacitor exists, step 204 is executed; if at least two first compensation capacitors exist, executing step 205; if not, step 206 is performed.
204. Replacing the current compensation capacitor with the first standard compensation capacitor to serve as an adjusting compensation capacitor;
in this embodiment, since there is only one first compensation capacitor, the current compensation capacitor is replaced by the first target compensation capacitor, and the first target compensation capacitor is used as the adjustment compensation capacitor.
205. Randomly selecting one of the at least two first compensation capacitors as an adjustment compensation capacitor, and replacing the current compensation capacitor with the adjustment compensation capacitor;
in this embodiment, since there are a plurality of first compensation capacitors, one of the at least two first compensation capacitors is randomly selected as an adjustment compensation capacitor, and the current compensation capacitor is replaced by the adjustment compensation capacitor.
206. And acquiring the technological parameters of the current compensation capacitor, and adjusting the technological parameters of the current compensation capacitor to obtain an adjusted compensation capacitor, wherein the capacitance value of the adjusted compensation capacitor is equal to the preset capacitance value.
In this embodiment, since the first compensation capacitor does not exist, the process parameter of the current compensation capacitor needs to be adjusted, so as to adjust the capacitance value of the current compensation capacitor to meet the preset capacitance value.
Optionally, the specific process parameter adjustment needs to relate to the inter-plate distance d and the counter-plate area S through a capacitance calculation formula C ═ epsilon S/4 pi kd; and e, pi and k are constants, the distance d between the polar plates and/or the dead-against area S of the polar plates of the current compensation capacitor are/is adjusted to obtain an adjusted compensation capacitor, and the capacitance value of the adjusted compensation capacitor is equal to the preset capacitance value.
Optionally, according to the embodiment shown in fig. 2, in some embodiments of the present invention, the process parameters further include a spacing adjustment limiting range and an area adjustment limiting range,
adjusting the plate spacing and/or the plate dead area of the current compensation capacitor, and before the adjustment of the compensation capacitor, the method further comprises:
judging whether the adjustment range of the electrode plate distance of the current compensation capacitor exceeds the distance adjustment limit range or not;
if the distance adjustment limiting range is exceeded, selecting a first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, and after the electrode plate distance and the electrode plate dead-facing area of the first adjustable compensation capacitor are adjusted, the capacitance value of the first adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the first adjustable compensation capacitor;
if the adjustment range of the positive facing area of the polar plate of the current compensation capacitor does not exceed the spacing adjustment limit range, judging whether the adjustment range of the positive facing area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range;
if the area adjustment limiting range is exceeded, selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, and after the electrode plate distance and the electrode plate dead-against area of the second adjustable compensation capacitor are adjusted, the capacitance value of the second adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the second adjustable compensation capacitor;
and if the area adjustment limit range is not exceeded, determining that the current compensation capacitor is adjustable.
In the embodiment of the invention, before the electrode plate distance and/or the electrode plate facing area of the current compensation capacitor are adjusted to obtain the adjusted compensation capacitor, the adjustment range of the electrode plate distance d and the electrode plate facing area S is also required to be considered, and the electrode plate distance d and the electrode plate facing area S have certain limitation due to the limitation of the process, so the process parameters also comprise the distance adjustment limitation range and the area adjustment limitation range,
(1) judging whether the adjustment range of the electrode plate distance of the current compensation capacitor exceeds the distance adjustment limit range or not;
(2) if the distance between the electrode plates of the first adjustable compensation capacitor and the positive electrode plate area of the first adjustable compensation capacitor are not beyond the distance adjustment limiting range and the area adjustment limiting range of the first adjustable compensation capacitor, selecting the first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, and after the electrode plate distance and the positive electrode plate area of the first adjustable compensation capacitor are adjusted, enabling the capacitance value of the first adjustable compensation capacitor to be equal to a preset capacitance value;
(3) if the adjustment range of the positive facing area of the polar plate of the current compensation capacitor does not exceed the interval adjustment limit range, judging whether the adjustment range of the positive facing area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range;
(4) if the distance between the pole plates of the second adjustable compensation capacitor and the positive area of the pole plates are adjusted, the capacitance value of the second adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor;
(5) and if the area adjustment limit range is not exceeded, determining that the current compensation capacitor is adjustable.
Therefore, before adjusting the current compensation capacitor, it is further required to determine whether the current compensation capacitor can be adjusted, only when the adjustment range of the inter-plate distance does not exceed the distance adjustment limit range and the adjustment range of the over-plate area does not exceed the area adjustment limit range, the current compensation capacitor is adjustable, if the inter-plate distance adjustment limit range or the area adjustment limit range is exceeded, because it has been described before, the compensation capacitor bank does not have the supplementary capacitor satisfying the preset capacitance value, then the adjustable compensation capacitor needs to be selected from the compensation capacitor bank, after the inter-plate distance and the over-plate area are adjusted, the capacitance value is equal to the preset capacitance value, and the adjustment process does not exceed the distance adjustment limit range and the area adjustment limit range.
Referring to fig. 3, an embodiment of the invention provides an adaptive frequency modulation system for an intermediate frequency induction heating furnace, including:
the device comprises an intermediate frequency induction heating furnace 301, a controller 302 and a compensation capacitor group 303, wherein the compensation capacitor group 303 is adjustable, and the compensation capacitor group 303 comprises at least two compensation capacitors;
a controller 302 for obtaining a load equivalent resistance value, an inductance value and a preset frequency value of the intermediate frequency induction heating furnace 301;
the controller 302 is further configured to determine whether a current compensation capacitor in the compensation capacitor bank 303 needs to be adjusted according to the load equivalent resistance value, the inductance value, and the preset frequency value, where the compensation capacitor bank 303 includes at least two compensation capacitors;
the controller 302 is further configured to perform capacitance adjustment to obtain an adjusted compensation capacitor when the current compensation capacitor needs to be adjusted, so that an adjustment frequency value obtained by adjusting an adjustment capacitance value of the compensation capacitor, and a load equivalent resistance value and an inductance value is equal to the preset frequency value.
In the embodiment of the present invention, the controller 302 obtains the load equivalent resistance value, the inductance value and the preset frequency value of the intermediate frequency induction heating furnace 301, and determines whether the current compensation capacitor in the compensation capacitor set 303 needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, where the compensation capacitor set 303 includes at least two compensation capacitors, and when the current compensation capacitor needs to be adjusted, the capacitance adjustment is performed to obtain an adjusted compensation capacitor, so that the adjusted capacitance value of the adjusted compensation capacitor, the adjusted frequency value obtained by the load equivalent resistance value and the inductance value are equal to the preset frequency value. Compared with the prior art, the compensation capacitor group with at least two compensation capacitors can be changed into other compensation capacitors or the current compensation capacitor can be adjusted when the current compensation capacitor needs to be adjusted, the adjustment frequency value obtained by adjusting the adjustment capacitance value of the compensation capacitor, the load equivalent resistance value and the inductance value is equal to the preset frequency value, and the condition that the medium-frequency induction heating furnace cannot be used under the condition that a single compensation capacitor does not meet the frequency requirement is avoided.
Alternatively, in conjunction with the embodiment shown in fig. 3, in some embodiments of the invention,
the controller 302 is further configured to calculate a preset capacitance value according to the load equivalent resistance value, the inductance value, and the preset frequency value;
the controller 302 is further configured to obtain a compensation capacitance value of each compensation capacitor in the compensation capacitor group 303, and determine a current compensation capacitance value of a current compensation capacitor;
the controller 302 is further configured to determine whether the current compensation capacitance value is equal to a preset capacitance value;
the controller 302 is further configured to determine that the current compensation capacitor does not need to be adjusted if the current compensation capacitor is equal to the current compensation capacitor;
the controller 302 is further configured to determine that the current compensation capacitance needs to be adjusted if not equal to the current compensation capacitance.
In this embodiment of the present invention, the controller 302 calculates a preset capacitance value according to the load equivalent resistance value, the inductance value, and the preset frequency value, obtains a compensation capacitance value of each compensation capacitor in the compensation capacitor bank, and determines a current compensation capacitance value of the current compensation capacitor, where the compensation capacitance value of each compensation capacitor in the compensation capacitor bank may be obtained by directly adopting factory settings or by performing real-time measurement. Judging whether the current compensation capacitance value is equal to a preset capacitance value or not; if so, determining that the current compensation capacitor does not need to be adjusted; and if not, determining that the current compensation capacitor needs to be adjusted.
Alternatively, in conjunction with the embodiment shown in fig. 3, in some embodiments of the invention,
the controller 302 is further configured to determine whether the compensation capacitance value of the first compensation capacitor in the compensation capacitor bank 303 is equal to a preset capacitance value;
the controller 302 is further configured to replace the current compensation capacitor with the first target compensation capacitor if there is a first compensation capacitor, and use the replaced current compensation capacitor as the adjustment compensation capacitor;
the controller 302 is further configured to randomly select one of the at least two first compensation capacitors as an adjustment compensation capacitor if the at least two first compensation capacitors exist, and replace the current compensation capacitor with the adjustment compensation capacitor;
and the controller is also used for acquiring the process parameters of the current compensation capacitor and adjusting the process parameters of the current compensation capacitor to obtain an adjusted compensation capacitor if the current compensation capacitor does not exist, wherein the capacitance value of the adjusted compensation capacitor is equal to the preset capacitance value.
Alternatively, in conjunction with the embodiment shown in fig. 3, in some embodiments of the invention,
the controller 302 is further configured to obtain process parameters of the current compensation capacitor, where the process parameters include a gap between the plates and a positive plate area;
the controller 302 is further configured to adjust a plate distance and/or a plate facing area of the current compensation capacitor to obtain an adjusted compensation capacitor, where a capacitance value of the adjusted compensation capacitor is equal to a preset capacitance value.
Optionally, in some embodiments of the present invention, in combination with the embodiment shown in fig. 3, the process parameters further include a spacing adjustment limiting range and an area adjustment limiting range,
the controller 302 is further configured to determine whether an adjustment range of a plate spacing of the current compensation capacitor exceeds a spacing adjustment limit range;
the controller 302 is further configured to select a first adjustable compensation capacitor from the compensation capacitor bank 303 as an adjustment compensation capacitor if the distance adjustment limit range is exceeded, where after the electrode plate distance and the electrode plate dead-facing area of the first adjustable compensation capacitor are adjusted, the capacitance value of the first adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limit range and the area adjustment limit range of the first adjustable compensation capacitor;
the controller 302 is further configured to determine whether the adjustment range of the area directly opposite to the current compensation capacitor plate exceeds the area adjustment limit range if the adjustment range of the distance adjustment limit range is not exceeded;
the controller 302 is further configured to select a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor if the area adjustment limit range is exceeded, where after the electrode plate distance and the electrode plate dead-against area of the second adjustable compensation capacitor are adjusted, a capacitance value of the second adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor;
the controller 302 is further configured to determine that the current compensation capacitor is adjustable if the area adjustment limit is not exceeded.
In the embodiment of the invention, before the electrode plate distance and/or the electrode plate opposite area of the current compensation capacitor are adjusted to obtain the adjusted compensation capacitor, the adjustment range of the electrode plate distance d and the electrode plate opposite area S is also considered, and the electrode plate distance d and the electrode plate opposite area S are limited due to the process limitation, so the process parameters also comprise the distance adjustment limitation range and the area adjustment limitation range, therefore, before the current compensation capacitor is adjusted, whether the current compensation capacitor can be adjusted is also determined, only under the condition that the adjustment range of the electrode plate distance does not exceed the distance adjustment limitation range and the adjustment range of the electrode plate opposite area does not exceed the area adjustment limitation range, the current compensation capacitor is adjustable, if the adjustment range of the electrode plate distance exceeds the distance adjustment limitation range or exceeds the area adjustment limitation range, because the adjustment range is described before, the compensation capacitor group does not have a supplementary capacitor to meet the preset capacitance value, so that an adjustable compensation capacitor needs to be selected from the compensation capacitor group, after the electrode plate distance and the electrode plate are just opposite to the area to be adjusted, the capacitance value is equal to the preset capacitance value, and the adjustment process cannot exceed the distance adjustment limiting range and the area adjustment limiting range.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An adaptive frequency modulation method of an intermediate frequency induction heating furnace is characterized by comprising the following steps:
acquiring a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace;
judging whether the current compensation capacitor in a compensation capacitor set needs to be adjusted or not according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitor set comprises at least two compensation capacitors;
and when the current compensation capacitor needs to be adjusted, adjusting the capacitor to obtain an adjusted compensation capacitor, so that an adjusted frequency value obtained by adjusting the adjusted capacitance value of the adjusted compensation capacitor, the load equivalent resistance value and the inductance value is equal to the preset frequency value.
2. The method of claim 1, wherein the determining whether the current compensation capacitor in the compensation capacitor bank needs to be adjusted according to the load equivalent resistance value, the inductance value, and the predetermined frequency value comprises:
calculating to obtain a preset capacitance value according to the load equivalent resistance value, the inductance value and the preset frequency value;
acquiring a compensation capacitance value of each compensation capacitor in the compensation capacitor group, and determining a current compensation capacitance value of a current compensation capacitor;
judging whether the current compensation capacitance value is equal to the preset capacitance value or not;
if so, determining that the current compensation capacitor does not need to be adjusted;
and if not, determining that the current compensation capacitor needs to be adjusted.
3. The method of claim 2, wherein the performing the capacitance adjustment to obtain an adjusted compensation capacitance comprises:
judging whether the compensation capacitance value of the first compensation capacitor in the compensation capacitor group is equal to the preset capacitance value or not;
if one first compensation capacitor exists, replacing the current compensation capacitor with the first standard compensation capacitor to serve as an adjustment compensation capacitor;
if at least two first compensation capacitors exist, one of the at least two first compensation capacitors is randomly selected as an adjustment compensation capacitor, and the current compensation capacitor is replaced by the adjustment compensation capacitor;
and if not, acquiring the process parameters of the current compensation capacitor, and adjusting the process parameters of the current compensation capacitor to obtain an adjusted compensation capacitor, wherein the capacitance value of the adjusted compensation capacitor is equal to a preset capacitance value.
4. The method of claim 3, wherein the obtaining the process parameter of the current compensation capacitor and adjusting the process parameter of the current compensation capacitor to obtain an adjusted compensation capacitor comprises:
acquiring process parameters of the current compensation capacitor, wherein the process parameters comprise the distance between polar plates and the positive facing area of the polar plates;
and adjusting the distance between the polar plates and/or the positive facing area of the polar plates of the current compensation capacitor to obtain an adjusted compensation capacitor, wherein the capacitance value of the adjusted compensation capacitor is equal to a preset capacitance value.
5. The method of claim 4, wherein the process parameters further include a pitch adjustment limit range and an area adjustment limit range,
before the electrode plate distance and/or the electrode plate dead area of the current compensation capacitor is adjusted to obtain the adjusted compensation capacitor, the method further comprises the following steps:
judging whether the adjustment range of the electrode plate distance of the current compensation capacitor exceeds the distance adjustment limit range or not;
if the distance adjustment limiting range is exceeded, selecting a first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, and after the electrode plate distance and the electrode plate dead-facing area of the first adjustable compensation capacitor are adjusted, the capacitance value of the first adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the first adjustable compensation capacitor;
if the adjustment range of the positive electrode plate facing area of the current compensation capacitor does not exceed the interval adjustment limit range, judging whether the adjustment range of the positive electrode plate facing area of the current compensation capacitor exceeds the area adjustment limit range;
if the area adjustment limiting range is exceeded, selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, wherein after the electrode plate distance and the electrode plate dead-against area of the second adjustable compensation capacitor are adjusted, the capacitance value of the second adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the second adjustable compensation capacitor;
and if the area adjustment limit range is not exceeded, determining that the current compensation capacitor is adjustable.
6. The self-adaptive frequency modulation system of the medium-frequency induction heating furnace is characterized by comprising the following components:
the device comprises an intermediate frequency induction heating furnace, a controller and a compensation capacitor set, wherein the compensation capacitor set is adjustable and comprises at least two compensation capacitors;
the controller is used for acquiring a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace;
the controller is further configured to determine whether a current compensation capacitor in a compensation capacitor bank needs to be adjusted according to the load equivalent resistance value, the inductance value, and the preset frequency value, where the compensation capacitor bank includes at least two compensation capacitors;
the controller is further configured to perform capacitance adjustment to obtain an adjusted compensation capacitor when the current compensation capacitor needs to be adjusted, so that an adjustment frequency value obtained by adjusting an adjustment capacitance value of the adjusted compensation capacitor, the load equivalent resistance value, and the inductance value is equal to the preset frequency value.
7. The system of claim 6,
the controller is further configured to calculate a preset capacitance value according to the load equivalent resistance value, the inductance value, and the preset frequency value;
the controller is further configured to obtain a compensation capacitance value of each compensation capacitor in the compensation capacitor group, and determine a current compensation capacitance value of a current compensation capacitor;
the controller is further configured to determine whether the current compensation capacitance value is equal to the preset capacitance value;
the controller is further configured to determine that the current compensation capacitor does not need to be adjusted if the current compensation capacitor is equal to the current compensation capacitor;
the controller is further configured to determine that the current compensation capacitance needs to be adjusted if not equal to the current compensation capacitance.
8. The method of claim 7,
the controller is further configured to determine whether a compensation capacitance value of a first compensation capacitor in the compensation capacitor bank is equal to the preset capacitance value;
the controller is further configured to replace the current compensation capacitor with the first target compensation capacitor if one first compensation capacitor exists, and use the replaced current compensation capacitor as an adjustment compensation capacitor;
the controller is further configured to randomly select one of the at least two first compensation capacitors as an adjustment compensation capacitor if at least two first compensation capacitors exist, and replace the current compensation capacitor with the adjustment compensation capacitor;
the controller is further configured to, if the current compensation capacitor does not exist, obtain a process parameter of the current compensation capacitor, adjust the process parameter of the current compensation capacitor, and obtain an adjusted compensation capacitor, where a capacitance value of the adjusted compensation capacitor is equal to a preset capacitance value.
9. The system of claim 8,
the controller is further used for obtaining technological parameters of the current compensation capacitor, and the technological parameters comprise the distance between the polar plates and the facing area of the polar plates;
the controller is further configured to adjust the inter-electrode plate distance and/or the area of the current compensation capacitor directly opposite to the electrode plate to obtain an adjusted compensation capacitor, and a capacitance value of the adjusted compensation capacitor is equal to a preset capacitance value.
10. The system of claim 9, wherein the process parameters further include a pitch adjustment limit range and an area adjustment limit range,
the controller is further configured to determine whether an adjustment range of the inter-electrode plate distance of the current compensation capacitor exceeds the distance adjustment limit range;
the controller is further configured to select a first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor if the distance adjustment limiting range is exceeded, and after the electrode plate distance and the electrode plate dead-facing area of the first adjustable compensation capacitor are adjusted, the capacitance value of the first adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limiting range and the area adjustment limiting range of the first adjustable compensation capacitor;
the controller is further configured to determine whether the adjustment range of the area directly opposite to the electrode plate of the current compensation capacitor exceeds the area adjustment limit range if the adjustment range of the distance is not exceeded;
the controller is further configured to select a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor if the area adjustment limit range is exceeded, wherein after the electrode plate distance and the electrode plate dead-against area of the second adjustable compensation capacitor are adjusted, the capacitance value of the second adjustable compensation capacitor is equal to a preset capacitance value and does not exceed the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor;
the controller is further configured to determine that the current compensation capacitance is adjustable if the area adjustment limit range is not exceeded.
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