CN112543525B - 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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Abstract
The application discloses self-adaptive frequency modulation method and system of an intermediate frequency induction heating furnace, through the compensation capacitor group with at least two compensation capacitors, when the current compensation capacitor needs to be adjusted, the adjustment can be changed into other compensation capacitors or the current compensation capacitor is adjusted by itself, the adjustment frequency value obtained by the adjustment capacitance value, the load equivalent resistance value and the inductance value of the adjustment compensation capacitor is equal to the preset frequency value, and the condition that the intermediate frequency induction heating furnace cannot be used under the condition that the single compensation capacitor does not meet the frequency requirement is avoided. The method comprises the following steps: obtaining 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 capacitance in the compensation capacitance group needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value; when the current compensation capacitance needs to be adjusted, capacitance adjustment is performed to obtain an adjusted compensation capacitance, 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 system for an intermediate frequency induction heating furnace.
Background
The coil of the medium-frequency power supply of the common induction furnace is designed in advance, and a power supply manufacturer calculates a corresponding compensation capacitance value according to the coil load parameter, so that a pre-designed frequency value is achieved.
However, due to calculation deviation or installation material problems, the actual parameters of the coil deviate from the calculated values, and the compensation capacitance should be adjusted accordingly.
The existing compensation capacitor adjusting mode generally adjusts the distance between polar plates and the opposite polar plate area of the compensation capacitor, but the adjustment of a single compensation capacitor still can not meet the adjustment requirement, so that the induction furnace can not 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, which can change the current compensation capacitor into other compensation capacitors or adjust the current compensation capacitor by the compensation capacitor group with at least two compensation capacitors when the current compensation capacitor needs to be adjusted, so that an 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 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 first aspect of the invention provides a self-adaptive frequency modulation method of an intermediate frequency induction heating furnace, which comprises the following steps:
obtaining 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 capacitance in the compensation capacitance group needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitance group comprises at least two compensation capacitances;
when the current compensation capacitor needs to be adjusted, capacitance adjustment is performed 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.
Further, according to the load equivalent resistance value, the inductance value and the preset frequency value, judging whether the current compensation capacitance in the compensation capacitance group needs to be adjusted or not includes:
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 the current compensation capacitor;
judging whether the current compensation capacitance value is equal to a preset capacitance value or not;
if the current compensation capacitance is equal to the current compensation capacitance, determining that the current compensation capacitance does not need to be adjusted;
if not, determining that the current compensation capacitance needs to be adjusted.
Further, performing capacitance adjustment to obtain an adjusted compensation capacitance, including:
judging whether the compensation capacitance value of the first compensation capacitor exists in the compensation capacitor group or not, wherein the compensation capacitance value of the first compensation capacitor is equal to a preset capacitance value;
if a first compensation capacitor exists, replacing the current compensation capacitor with the first standard compensation capacitor to be used as an adjustment compensation capacitor;
if at least two first compensation capacitors exist, randomly selecting one of the at least two first compensation capacitors as an adjustment compensation capacitor, and replacing the adjustment compensation capacitor with the current compensation capacitor;
if the current compensation capacitance does not exist, the process parameters of the current compensation capacitance are obtained, the process parameters of the current compensation capacitance are adjusted, and the adjusted compensation capacitance is obtained, wherein the capacitance value of the adjusted compensation capacitance is equal to the preset capacitance value.
Further, obtaining the process parameter of the current compensation capacitor, adjusting the process parameter of the current compensation capacitor to obtain the adjusted compensation capacitor, including:
acquiring technological parameters of the current compensation capacitor, wherein the technological parameters comprise the distance between polar plates and the right facing area of the polar plates;
and adjusting the plate distance and/or the plate opposite area 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, the process parameters also include spacing adjustment limits and area adjustment limits,
the method comprises the steps of adjusting the distance between polar plates and/or the right facing area of the polar plates of the current compensation capacitor, and before the compensation capacitor is adjusted, further comprising:
judging whether the adjustment range of the polar plate distance of the current compensation capacitor exceeds the distance adjustment limit range;
if the distance adjustment limit range is exceeded, selecting a first adjustable compensation capacitor from the compensation capacitor group, and adjusting the distance between polar plates and the polar plate facing area of the first adjustable compensation capacitor as an adjustment compensation capacitor, wherein 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;
if the spacing adjustment limit range is not exceeded, judging whether the adjustment range of the positive area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range;
if the area adjustment limit range is exceeded, selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, wherein after the polar plate distance and the polar plate dead 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 the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor are not exceeded;
if the area adjustment limit is not exceeded, determining that the current compensation capacitance is adjustable.
The second aspect of the invention provides an adaptive frequency modulation system of an intermediate frequency induction heating furnace, comprising:
the medium-frequency induction heating furnace, the controller and the compensation capacitor group are adjustable, and the compensation capacitor group comprises at least two compensation capacitors;
the controller is used for acquiring the load equivalent resistance value, the inductance value and the preset frequency value of the medium-frequency induction heating furnace;
the controller is also used for judging whether the current compensation capacitance in the compensation capacitance group needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, and the compensation capacitance group comprises at least two compensation capacitances;
and the controller is also used for carrying out capacitance adjustment when the current compensation capacitance needs to be adjusted to obtain an adjusted compensation capacitance, so that an adjusted frequency value obtained by adjusting the adjusted capacitance value of the compensation capacitance, the load equivalent resistance value and the inductance value is equal to a preset frequency value.
Further, the method comprises the steps of,
the controller is also used for calculating a preset capacitance value according to the load equivalent resistance value, the inductance value and the preset frequency value;
the controller is also 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 capacitance does not need to be adjusted if the current compensation capacitance is equal to the current compensation capacitance;
and the controller is also used for determining that the current compensation capacitance needs to be adjusted if the current compensation capacitance is not equal to the current compensation capacitance.
Further, the method comprises the steps of,
the controller is also used for judging whether the compensation capacitance value of the first compensation capacitor exists in the compensation capacitor group or not and is equal to a preset capacitance value;
the controller is also used for replacing the current compensation capacitor with the first standard compensation capacitor if the first compensation capacitor exists, and the first standard compensation capacitor is used as an adjustment compensation capacitor;
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 adjustment compensation capacitor with the current compensation capacitor;
and the controller is also used for acquiring the technological parameters of the current compensation capacitor if the current compensation capacitor does not exist, adjusting the technological parameters 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.
Further, the method comprises the steps of,
the controller is also used for acquiring the technological parameters of the current compensation capacitor, wherein the technological parameters comprise the distance between the polar plates and the opposite area of the polar plates;
the controller is also used for adjusting the distance between the polar plates and/or the right 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.
Further, the process parameters also include spacing adjustment limits and area adjustment limits,
the controller is also used for judging whether the adjustment range of the polar plate distance of the current compensation capacitor exceeds the distance adjustment limit range;
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 limit range is exceeded, wherein after the polar plate distance and the polar plate opposite 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 the distance adjustment limit range and the area adjustment limit range of the first adjustable compensation capacitor are not exceeded;
the controller is also used for judging whether the adjusting range of the polar plate opposite area of the current compensation capacitor exceeds the area adjusting limiting range if the distance adjusting limiting range is not exceeded;
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 polar plate distance and the polar plate facing 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;
and the controller is also used for determining that the current compensation capacitance is adjustable if the area adjustment limit range is not exceeded.
Therefore, the self-adaptive frequency modulation method of the intermediate frequency induction heating furnace obtains the load equivalent resistance value, the inductance value and the preset frequency value of the intermediate frequency induction heating furnace, judges whether the current compensation capacitance in the compensation capacitance group needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, and when the current compensation capacitance needs to be adjusted, carries out capacitance adjustment to obtain the adjusted compensation capacitance, so that the adjusted frequency value obtained by adjusting the adjusted capacitance value of the compensation capacitance, the load equivalent resistance value and the inductance value is 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 capacitors can be adjusted when the current compensation capacitors need to be adjusted, 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 situation that the intermediate frequency induction heating furnace cannot be used under the condition that the 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 that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
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 the adaptive frequency modulation method for an intermediate frequency induction heating furnace provided by the 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, which can change the current compensation capacitor into other compensation capacitors or adjust the current compensation capacitor by a compensation capacitor group with at least two compensation capacitors when the current compensation capacitor needs to be adjusted, so that an adjustment frequency value obtained by adjusting the 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 following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Referring to fig. 1, an embodiment of the present invention provides an adaptive frequency modulation method for an intermediate frequency induction heating furnace, including:
101. obtaining 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 intermediate frequency power supply of the intermediate frequency 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, so that 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 capacitance in the compensation capacitance group needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitance group comprises at least two compensation capacitances; if yes, go to step 103;
in this embodiment, the formula is usedf represents a preset frequency value, L represents an inductance value, pi is a constant, and then the capacitance value of the current compensation capacitor needs to satisfy the capacitance value C calculated by the formula, and it is determined whether the current compensation capacitor in the compensation capacitor group needs to be adjusted, if so, step 103 is executed.
103. And performing capacitance adjustment to obtain an adjustment compensation capacitance, so that an adjustment frequency value obtained by adjusting the adjustment capacitance value of the compensation capacitance, the load equivalent resistance value and the inductance value is equal to a preset frequency value.
In this embodiment, since the compensation capacitor set has at least two compensation capacitors, the compensation capacitor set may be specifically configured as a switched capacitor set, and may be changed into another compensation capacitor or the current compensation capacitor itself may be adjusted when the current compensation capacitor needs to be adjusted, so as to obtain an adjustment frequency value obtained by adjusting the adjustment capacitance value of the compensation capacitor, the load equivalent resistance value and the inductance value equal to a preset frequency value.
In the embodiment of the invention, a load equivalent resistance value, an inductance value and a preset frequency value of the medium-frequency induction heating furnace are obtained, whether the current compensation capacitance in the compensation capacitance group needs to be adjusted is judged according to the load equivalent resistance value, the inductance value and the preset frequency value, the compensation capacitance group comprises at least two compensation capacitances, and when the current compensation capacitance needs to be adjusted, capacitance adjustment is carried out to obtain an adjusted compensation capacitance, so that the adjusted frequency value obtained by adjusting the adjusted capacitance value of the compensation capacitance, the load equivalent resistance value and the inductance value is 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 capacitors can be adjusted when the current compensation capacitors need to be adjusted, 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 situation that the intermediate frequency induction heating furnace cannot be used under the condition that the 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 group 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 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 the current compensation capacitor;
judging whether the current compensation capacitance value is equal to a preset capacitance value or not;
if the current compensation capacitance is equal to the current compensation capacitance, determining that the current compensation capacitance does not need to be adjusted;
if not, determining that the current compensation capacitance needs to be adjusted.
In the embodiment of the invention, the preset capacitance value is obtained by calculation 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, the current compensation capacitance value of the current compensation capacitor is determined, and the compensation capacitance value of each compensation capacitor in the compensation capacitor group can be directly set by factory or can be obtained by real-time measurement. Judging whether the current compensation capacitance value is equal to a preset capacitance value or not; if the current compensation capacitance is equal to the current compensation capacitance, determining that the current compensation capacitance does not need to be adjusted; if not, determining that the current compensation capacitance needs to be adjusted.
Referring to fig. 2, an embodiment of the present invention provides an adaptive frequency modulation method for an intermediate frequency induction heating furnace, including:
201. obtaining 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 capacitance in the compensation capacitance group needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitance group comprises at least two compensation capacitances; if yes, go to step 203;
203. judging whether the compensation capacitance value of the first compensation capacitor exists in the compensation capacitor group or not, wherein the compensation capacitance value of the first compensation capacitor is equal to a preset capacitance value;
in this embodiment, it is determined whether the compensation capacitance value of the first compensation capacitor in the compensation capacitor set is equal to the preset capacitance value, if only one first compensation capacitor exists, step 204 is performed; if there are at least two first compensation capacitances, performing step 205; if not, step 206 is performed.
204. Replacing the current compensation capacitor with the first standard compensation capacitor to be used as an adjustment compensation capacitor;
in this embodiment, since there is only one first compensation capacitor, the first compensation capacitor is replaced by the current compensation capacitor, and 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 the adjustment compensation capacitor, and the adjustment compensation capacitor is replaced by the current compensation capacitor.
206. And obtaining 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 that the capacitance value of the current compensation capacitor is adjusted to meet the preset capacitance value.
Optionally, specific process parameters are adjusted, and the electrode plate distance d and the electrode plate facing area S are required to be related through a calculation formula C=epsilon S/4 pi kd of the capacitance; and adjusting the plate distance d and/or the plate opposite area S 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.
Alternatively, in accordance with the embodiment of the present invention shown in fig. 2, the process parameters further include a spacing adjustment limit and an area adjustment limit,
the method comprises the steps of adjusting the distance between polar plates and/or the right facing area of the polar plates of the current compensation capacitor, and before the compensation capacitor is adjusted, further comprising:
judging whether the adjustment range of the polar plate distance of the current compensation capacitor exceeds the distance adjustment limit range;
if the distance adjustment limit range is exceeded, selecting a first adjustable compensation capacitor from the compensation capacitor group, and adjusting the distance between polar plates and the polar plate facing area of the first adjustable compensation capacitor as an adjustment compensation capacitor, wherein 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;
if the spacing adjustment limit range is not exceeded, judging whether the adjustment range of the positive area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range;
if the area adjustment limit range is exceeded, selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, wherein after the polar plate distance and the polar plate dead 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 the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor are not exceeded;
if the area adjustment limit is not exceeded, determining that the current compensation capacitance is adjustable.
In the embodiment of the invention, before the polar plate distance and/or polar plate opposite area of the current compensation capacitor are adjusted to obtain the adjustment compensation capacitor, the adjustment range of polar plate distance d and polar plate opposite area S is also required to be considered, and the polar plate distance d and polar plate opposite area S are limited to a certain extent due to the limitation of the process, so the process parameters also comprise a distance adjustment limiting range and an area adjustment limiting range,
(1) Judging whether the adjustment range of the polar plate distance of the current compensation capacitor exceeds the distance adjustment limit range;
(2) If the distance adjustment limit range is exceeded, selecting a first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, wherein after the polar plate distance and the polar plate opposite 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 the distance adjustment limit range and the area adjustment limit range of the first adjustable compensation capacitor are not exceeded;
(3) If the spacing adjustment limit range is not exceeded, judging whether the adjustment range of the polar plate opposite area of the current compensation capacitor exceeds the area adjustment limit range;
(4) If the area adjustment limit range is exceeded, selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, wherein after the polar plate distance and the polar plate opposite 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 the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor are not exceeded;
(5) If the area adjustment limit is not exceeded, determining that the current compensation capacitance is adjustable.
Therefore, before the current compensation capacitor is adjusted, whether the current compensation capacitor can be adjusted is determined, only if the adjustment range of the plate distance does not exceed the distance adjustment limit range and the adjustment range of the plate facing area does not exceed the area adjustment limit range, the current compensation capacitor is adjustable, and if the adjustment range exceeds the distance adjustment limit range or the area adjustment limit range, the compensation capacitor group does not have the supplementary capacitor meeting the preset capacitance value, the adjustable compensation capacitor is selected from the compensation capacitor group, the capacitance value is equal to the preset capacitance value after the plate distance and the plate facing area are adjusted, 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 present invention provides an adaptive frequency modulation system of an intermediate frequency induction heating furnace, including:
the medium frequency induction heating furnace 301, the controller 302 and the compensation capacitor group 303, wherein the compensation capacitor group 303 is adjustable, and the compensation capacitor group 303 comprises at least two compensation capacitors;
the controller 302 is configured to obtain 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, according to the load equivalent resistance value, the inductance value, and the preset frequency value, whether the current compensation capacitance in the compensation capacitance set 303 needs to be adjusted, where the compensation capacitance set 303 includes at least two compensation capacitances;
the controller 302 is further configured to perform capacitance adjustment when the current compensation capacitance needs to be adjusted, so as to obtain an adjusted compensation capacitance, so that an adjusted frequency value obtained by adjusting an adjusted capacitance value of the compensation capacitance, a load equivalent resistance value and an inductance value is equal to a 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 capacitance in the compensation capacitance set 303 needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitance set 303 comprises at least two compensation capacitances, and when the current compensation capacitance needs to be adjusted, the capacitance adjustment is performed to obtain an adjusted compensation capacitance, so that the adjusted capacitance value of the adjusted compensation capacitance, the load equivalent resistance value and the adjustment frequency value obtained by 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 capacitors can be adjusted when the current compensation capacitors need to be adjusted, 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 situation that the intermediate frequency induction heating furnace cannot be used under the condition that the single compensation capacitor does not meet the frequency requirement is avoided.
Alternatively, in connection 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 the 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 capacitance does not need to be adjusted if the current compensation capacitance is equal to the current compensation capacitance;
the controller 302 is further configured to determine that the current compensation capacitance needs to be adjusted if the current compensation capacitance is not equal to the current compensation capacitance.
In the embodiment of the present invention, the controller 302 calculates the preset capacitance value according to the load equivalent resistance value, the inductance value and the preset frequency value, obtains the compensation capacitance value of each compensation capacitor in the compensation capacitor group, determines the current compensation capacitance value of the current compensation capacitor, and may be factory-set directly or measured in real time. Judging whether the current compensation capacitance value is equal to a preset capacitance value or not; if the current compensation capacitance is equal to the current compensation capacitance, determining that the current compensation capacitance does not need to be adjusted; if not, determining that the current compensation capacitance needs to be adjusted.
Alternatively, in connection 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 set 303 is equal to a preset capacitance value;
the controller 302 is further configured to replace the first compensation capacitor with the current compensation capacitor if there is a first compensation capacitor, and use the first compensation capacitor as the adjustment compensation capacitor;
the controller 302 is further configured to, if there are at least two first compensation capacitors, randomly select one of the at least two first compensation capacitors as an adjustment compensation capacitor, and replace the adjustment compensation capacitor with the current compensation capacitor;
and the controller is also used for acquiring the technological parameters of the current compensation capacitor if the current compensation capacitor does not exist, adjusting the technological parameters 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.
Alternatively, in connection with the embodiment shown in fig. 3, in some embodiments of the invention,
the controller 302 is further configured to obtain a process parameter of the current compensation capacitor, where the process parameter includes a plate distance and a plate facing area;
the controller 302 is further configured to adjust a plate distance and/or a plate facing area of the current compensation capacitor, so as to obtain an adjusted compensation capacitor, where a capacitance value of the adjusted compensation capacitor is equal to a preset capacitance value.
Alternatively, in some embodiments of the invention, in conjunction with the embodiment shown in fig. 3, the process parameters further include a spacing adjustment limit and an area adjustment limit,
the controller 302 is further configured to determine whether an adjustment range of a plate pitch of the current compensation capacitor exceeds a pitch adjustment limit range;
the controller 302 is further configured to select, if the distance adjustment limit range is exceeded, a first adjustable compensation capacitor from the compensation capacitor group 303, as an adjustment compensation capacitor, where after the plate distance and the plate 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 the distance adjustment limit range and the area adjustment limit range of the first adjustable compensation capacitor are not exceeded;
the controller 302 is further configured to determine whether an adjustment range of a positive electrode facing area of the current compensation capacitor exceeds an area adjustment limit range if the adjustment limit range of the positive electrode facing area does not exceed the spacing adjustment limit range;
the controller 302 is further configured to select a second adjustable compensation capacitor from the compensation capacitor set as an adjustment compensation capacitor if the area adjustment limit range is exceeded, wherein after the plate pitch and the plate facing 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 the pitch adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor are not exceeded;
the controller 302 is further configured to determine that the current compensation capacitance is adjustable if the area adjustment limit is not exceeded.
In the embodiment of the invention, before the plate spacing and/or the plate facing area of the current compensation capacitor are adjusted to obtain the adjustment compensation capacitor, the adjustment range of the plate spacing d and the plate facing area S also need to be considered, and because the adjustment range of the plate spacing d and the plate facing area S is limited due to the limitation of the process, the process parameters also comprise the spacing adjustment limit range and the area adjustment limit range, therefore, before the current compensation capacitor is adjusted, whether the current compensation capacitor can be adjusted is also needed, and only if the adjustment range of the plate spacing does not exceed the spacing adjustment limit range and the adjustment range of the plate facing area does not exceed the area adjustment limit range, the current compensation capacitor can be adjusted, and if the adjustment range of the spacing adjustment limit range or the area adjustment limit range is exceeded, because the compensation capacitor group does not supplement the capacitance to meet the preset capacitance value, the adjustable compensation capacitor is needed to be selected from the compensation capacitor group, and the capacitance value is equal to the preset capacitance value after the adjustment of the plate spacing and the plate facing area is adjusted, and the adjustment process cannot exceed the spacing adjustment limit range and the area adjustment limit range.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
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 one … …" does not exclude the presence of other like 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 (6)
1. An adaptive frequency modulation method for 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 capacitance in a compensation capacitance group needs to be adjusted according to the load equivalent resistance value, the inductance value and the preset frequency value, wherein the compensation capacitance group comprises at least two compensation capacitances;
when the current compensation capacitance needs to be adjusted, capacitance adjustment is carried out to obtain an adjustment compensation capacitance, so that an adjustment frequency value obtained by the adjustment capacitance value of the adjustment compensation capacitance, the load equivalent resistance value and the inductance value is equal to the preset frequency value;
wherein, according to the load equivalent resistance value, the inductance value and the preset frequency value, judging whether the current compensation capacitance in the compensation capacitance group needs to be adjusted or not includes:
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 capacitance does not need to be adjusted;
if not, determining that the current compensation capacitance needs to be adjusted;
the capacitance adjustment is performed to obtain an adjustment compensation capacitance, including:
judging whether the compensation capacitance value of the first compensation capacitor exists in the compensation capacitor group or not, wherein the compensation capacitance value of the first compensation capacitor is equal to the preset capacitance value;
if one first compensation capacitor exists, replacing the current compensation capacitor with the first compensation capacitor to be used as an adjustment compensation capacitor;
if at least two first compensation capacitors exist, randomly selecting one from the at least two first compensation capacitors as an adjustment compensation capacitor, and replacing the current compensation capacitor with the adjustment compensation capacitor;
if the current compensation capacitance does not exist, the process parameters of the current compensation capacitance are obtained, the process parameters of the current compensation capacitance are adjusted, and the adjusted compensation capacitance is obtained, wherein the capacitance value of the adjusted compensation capacitance is equal to the preset capacitance value.
2. The method of claim 1, wherein the obtaining the process parameter of the current compensation capacitor, adjusting the process parameter of the current compensation capacitor, and obtaining the adjusted compensation capacitor, comprises:
acquiring technological parameters of the current compensation capacitor, wherein the technological parameters comprise the distance between polar plates and the facing area of the polar plates;
and adjusting the distance between the polar plates and/or the right-facing area of the polar plates of the current compensation capacitor to obtain an adjustment compensation capacitor, wherein the capacitance value of the adjustment compensation capacitor is equal to a preset capacitance value.
3. The method of claim 2 wherein the process parameters further comprise a spacing adjustment limit and an area adjustment limit,
the step of adjusting the plate distance and/or the plate facing area of the current compensation capacitor, before obtaining the adjustment compensation capacitor, further comprises:
judging whether the adjustment range of the polar plate distance of the current compensation capacitor exceeds the distance adjustment limit range;
if the distance adjustment limit range is exceeded, selecting a first adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, wherein after the polar plate distance and the polar plate opposite 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 the distance adjustment limit range and the area adjustment limit range of the first adjustable compensation capacitor are not exceeded;
if the spacing adjustment limit range is not exceeded, judging whether the adjustment range of the positive area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range;
if the area adjustment limit range is exceeded, selecting a second adjustable compensation capacitor from the compensation capacitor group as an adjustment compensation capacitor, wherein after the polar plate distance and the polar plate opposite 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 the distance adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor are not exceeded;
and if the area adjustment limit range is not exceeded, determining that the current compensation capacitance is adjustable.
4. An adaptive frequency modulation system for an intermediate frequency induction heating furnace, comprising:
the medium-frequency induction heating furnace, the controller and the compensation capacitor group are adjustable, and the compensation capacitor group 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, according to the load equivalent resistance value, the inductance value, and the preset frequency value, whether a current compensation capacitor in a compensation capacitor group needs to be adjusted, where the compensation capacitor group includes at least two compensation capacitors;
the controller is further configured to perform capacitance adjustment when the current compensation capacitance needs to be adjusted, so as to obtain an adjusted compensation capacitance, so that an adjusted frequency value obtained by an adjusted capacitance value of the adjusted compensation capacitance, the load equivalent resistance value and the inductance value is equal to the preset frequency value;
wherein,,
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 capacitance does not need to be adjusted if the current compensation capacitance is equal to the current compensation capacitance;
the controller is further configured to determine that the current compensation capacitance needs to be adjusted if the current compensation capacitance is not equal to the current compensation capacitance;
the controller is further configured to determine whether a compensation capacitance value of the first compensation capacitor in the compensation capacitor group is equal to the preset capacitance value;
the controller is further configured to replace the current compensation capacitor with the first compensation capacitor if one of the first compensation capacitors exists, and to use the first compensation capacitor as an adjustment compensation capacitor;
the controller is further configured to, if at least two first compensation capacitors exist, randomly select one of the at least two first compensation capacitors as an adjustment compensation capacitor, and replace the adjustment compensation capacitor with the current compensation capacitor;
and the controller is also used for acquiring the technological parameters of the current compensation capacitor if the current compensation capacitor does not exist, 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 a preset capacitance value.
5. The system of claim 4, wherein the system further comprises a controller configured to control the controller,
the controller is also used for acquiring the technological parameters of the current compensation capacitor, wherein the technological parameters comprise the distance between the polar plates and the opposite area of the polar plates;
the controller is further configured to adjust the plate distance and/or the 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.
6. The system of claim 5 wherein the process parameters further comprise a spacing adjustment limit and an area adjustment limit,
the controller is further configured to determine whether an adjustment range of the plate pitch of the current compensation capacitor exceeds the pitch adjustment limit range;
the controller is further configured to select a first adjustable compensation capacitor from the compensation capacitor set as an adjustment compensation capacitor if the spacing adjustment limit range is exceeded, wherein after the plate spacing and the plate 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 the spacing adjustment limit range and the area adjustment limit range of the first adjustable compensation capacitor are not exceeded;
the controller is further configured to determine whether an adjustment range of the facing area of the polar plate of the current compensation capacitor exceeds the area adjustment limit range if the adjustment limit range of the distance is not exceeded;
the controller is further configured to select a second adjustable compensation capacitor from the compensation capacitor set as an adjustment compensation capacitor if the area adjustment limit range is exceeded, wherein after the plate pitch and the plate facing 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 the pitch adjustment limit range and the area adjustment limit range of the second adjustable compensation capacitor are not exceeded;
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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