CN114823092A - Lightweight transformer, lightweight transformer design method and high-voltage power supply - Google Patents
Lightweight transformer, lightweight transformer design method and high-voltage power supply Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/14—Constrictions; Gaps, e.g. air-gaps
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F2027/408—Association with diode or rectifier
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Abstract
The invention is suitable for the field of power electronics, and provides a lightweight transformer, a lightweight transformer design method and a high-voltage power supply, wherein the lightweight transformer comprises: the magnetic shunt comprises a magnetic core, a magnetic shunt annular magnetic core, a primary framework, a primary winding, a secondary framework, a secondary winding, a first air gap and a second air gap; the first air gap is positioned at the center pillar of the magnetic core; the second air gap is located at a side leg of the magnetic core; the annular magnetic core of the magnetic shunt penetrates through the magnetic core center pillar, and the distance from the top end of the magnetic core center pillar is equal to the groove width of the primary framework; the primary winding is uniformly wound in the primary framework by using litz wires; the secondary winding is wound inside the secondary skeleton by using a high-voltage insulated wire. The way of increasing leakage inductance is: by utilizing the parasitic capacitance existing in the voltage doubling rectifying circuit and the secondary winding of the transformer, the total integration of the capacitors connected in parallel is realized, the final purpose of reducing the weight of the converter is achieved, and the lightweight design requirement of the aircraft is met.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a lightweight transformer design method, a lightweight transformer and a high-voltage power supply.
Background
The electric air power propulsion mode is a novel propulsion mode, is different from the traditional mechanical motion to generate thrust, the thrust comes from 'ionic wind' generated by high-voltage ionized air, and meanwhile, the aircraft using the novel propulsion mode has the characteristic of light weight, so that the aircraft is paid attention to by broad scholars. The electric aerodynamic propulsion mode depends on a high-voltage power supply with high power density, and a high-voltage transformer is an important component in the high-voltage power supply and influences the important parameters of the power density of a circuit.
The transformer in the traditional LCC converter has large turn ratio, less turns of a primary winding and more turns of a secondary winding, the primary leakage inductance value of the transformer cannot completely realize the magnetic integration of resonance inductance, and an additional inductance needs to be connected in series outside the transformer for supplement, so that the weight of the converter is increased, and the lightweight design of an electric aerodynamic propulsion aircraft is not facilitated; the parasitic capacitance of the secondary of the transformer increases the loss of the transformer, and if the parasitic capacitance is designed and utilized, the magnetic integration of the LCC converter parallel capacitance is completely realized, the weight of the LCC converter is further reduced, and the lightweight design of the electric aerodynamic propulsion aircraft is facilitated.
Disclosure of Invention
The embodiment of the invention provides a lightweight transformer design method and a lightweight transformer, and aims to solve the problem that the existing transformer is not beneficial to lightweight design of an electric-aerodynamic propulsion aircraft.
An embodiment of the present invention provides a lightweight transformer, including: the magnetic shunt comprises a magnetic core, a magnetic shunt annular magnetic core, a primary framework, a primary winding, a secondary framework, a secondary winding, a first air gap and a second air gap;
the first air gap is positioned at the center pillar of the magnetic core;
the second air gap is located at a side leg of the magnetic core;
the first and second air gaps are equal in width;
the annular magnetic core of the magnetic shunt penetrates through the magnetic core center pillar, and the distance from the top end of the magnetic core center pillar is equal to the groove width of the primary framework;
the magnetic core and the annular magnetic core of the magnetic shunt are made of the same material and have the same magnetic permeability;
the primary winding is uniformly wound in the primary framework by using litz wires;
the secondary winding is wound inside the secondary skeleton by using a high-voltage insulated wire.
Preferably, the magnetic core, the primary bobbin, and the secondary bobbin are of a concentric axis structure.
Preferably, the primary bobbin, the secondary bobbin and the magnetic shunt annular magnetic core are independent structures;
and after the magnetic core forms a complete magnetic integrated transformer through the primary framework, the magnetic shunt annular magnetic core and the secondary framework, the magnetic integrated transformer is fixed into a whole by using an insulating adhesive tape.
Preferably, the relative permeability of the magnetic shunt toroidal core is less than or equal to the relative permeability of the core.
The present invention also provides a method for designing a lightweight transformer, which is used for designing any one of the lightweight transformers described above, and the method for designing the lightweight transformer includes:
designing the thickness of the annular magnetic core of the magnetic shunt to realize the leakage inductance of the transformer as resonance inductance;
and the integration of the parallel capacitor is realized by using the secondary winding of the transformer and the parasitic capacitor in the voltage doubling rectifying circuit.
Preferably, designing the thickness of the annular magnetic core of the magnetic shunt so as to realize the leakage inductance of the transformer as the resonant inductor specifically comprises:
according to the required resonance capacitance, the leakage inductance of the transformer with the magnetic shunt annular magnetic core structure is designed to be equal to the required resonance inductance, and the thickness t of the magnetic shunt annular magnetic core sh Solved by the following formula:
wherein a, b are determined by the following formula:
a＝R c2 +0.5(R 5 +R 6 +R c1 +2R cc +2R 7 )；
wherein the magnetic resistance R c1 、R c2 、R 5 、R 6 、R 7 And R cc Comprises the following steps:
wherein, L is resonance inductance needed by LCC converter, N p For the number of windings per layer of the primary winding, k p The number of primary winding layers, Ac the area of transformer magnetic pole, mu i Being a core or magnetic shunt toroidal core relative permeability, mu 0 Is the air permeability, /) g Is the first or second gap width,/ c2 The distance from the side column of the magnetic core to the center column of the magnetic core, b w Width of the core window, b d Is the thickness of the side pole of the magnetic core, W c Is the thickness of the magnetic core, /) c1 Is the magnetic core side column length, h 1 Is the distance h from the annular magnetic core of the magnetic shunt to the upper end of the central column of the magnetic core 2 The distance from the annular magnetic core of the magnetic shunt to the lower end of the central column of the magnetic core is as follows.
Preferably, the integration of the parallel capacitor by using the secondary winding of the transformer and the parasitic capacitor in the voltage-doubling rectifying circuit specifically includes:
calculating the capacitance value of the first equivalent capacitor;
calculating the capacitance value of the second equivalent capacitor according to the capacitance value of the first equivalent capacitor;
and calculating the number of layers of the secondary winding of the transformer.
Preferably, the capacitance value of the first equivalent capacitance is determined by the following formula:
wherein, C eq1 Is the capacitance value of the first equivalent capacitor; c D1 And C D2 Is the capacitance of the high voltage diode body, N S Number of secondary winding turns, N p Is the number of primary winding turns;
the capacitance value of the second equivalent capacitor is determined by the following formula:
wherein, C eq2 Is the capacitance value of the second equivalent capacitor, C P Parallel capacitance, C, required for LCC converters Wdg Is the parasitic capacitance of the secondary winding of the transformer.
Preferably, the calculating the number of secondary winding layers of the transformer is specifically determined by the following formula:
The specific calculation mode of the parameters is as follows:
wherein, HLT (N) S ) Is the secondary average winding length, N layer Number of secondary winding layers of transformer, epsilon 0 Is the dielectric constant of air, epsilon D Is the relative dielectric constant of the secondary winding insulation sheath, delta is the thickness of the secondary winding insulation sheath, d 0 Is the copper line center distance.
The invention also provides a light-weight high-voltage power supply for electroaerodynamic propulsion, which is provided with the light-weight transformer.
The invention achieves the following beneficial effects: a method for designing a lightweight transformer and a lightweight transformer are provided with: the magnetic shunt comprises a magnetic core, a magnetic shunt annular magnetic core, a primary framework, a primary winding, a secondary framework, a secondary winding, a first air gap and a second air gap; the first air gap is positioned at the center pillar of the magnetic core; the second air gap is located at a side leg of the magnetic core; the annular magnetic core of the magnetic shunt penetrates through the magnetic core center pillar, and the distance from the top end of the magnetic core center pillar is equal to the groove width of the primary framework; the primary winding is uniformly wound in the primary framework by using litz wires; the secondary winding is wound inside the secondary skeleton by using a high-voltage insulated wire. The mode of increasing leakage inductance is as follows: leakage inductance is adjusted by adjusting the number of turns of the coil and the distance between the primary stages, and the whole integration of the resonance inductance is realized; the parasitic capacitance existing in the voltage doubling rectifying circuit and the secondary winding of the transformer is utilized, the number of layers of the secondary winding is designed, and the required equivalent capacitance is formed by reflecting the secondary winding to the primary winding through the transformer, so that the complete integration of the capacitors connected in parallel is realized, the final purpose of reducing the weight of the converter is achieved, and the light-weight design requirement of an aircraft is met.
Drawings
Fig. 1 is a schematic cross-sectional view of a lightweight transformer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lightweight transformer according to an embodiment of the present invention;
fig. 3 is a schematic size diagram of a lightweight transformer according to an embodiment of the present invention;
fig. 4 is a reluctance diagram of a lightweight transformer according to an embodiment of the present invention;
fig. 5 is an equivalent circuit diagram of a lightweight transformer according to an embodiment of the present invention.
Reference numerals: the magnetic shunt comprises a magnetic core 1, a magnetic shunt annular magnetic core 2, a primary framework 3, a primary winding 4, a secondary framework 5, a secondary winding 6, a first air gap 7 and a second air gap 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, the terminology used in this specification includes any and all combinations of the associated listed items.
As shown in fig. 1, a lightweight transformer includes: the transformer comprises a magnetic core 1, a magnetic shunt annular magnetic core 2, a primary framework 3, a primary winding 4, a secondary framework 5, a secondary winding 6, a first air gap 7 and a second air gap 8;
the first air gap 7 is positioned at the center pillar of the magnetic core 1;
the second air gap 8 is positioned at the side column of the magnetic core 1;
the first air gap 7 and the second air gap 8 are equal in width;
the annular magnetic core 2 of the magnetic shunt passes through the center pillar of the magnetic core 1, and the distance from the top end of the center pillar of the magnetic core 1 is the groove width of the primary framework 3;
the magnetic core 1 and the magnetic shunt annular magnetic core 2 are made of the same material and have the same magnetic permeability;
the primary winding 4 is uniformly wound in the primary framework 3 by using litz wires;
the secondary winding 6 is wound inside the secondary bobbin 5 using a high voltage insulated wire.
The invention achieves the beneficial effects that the mode of increasing the leakage inductance adopts: leakage inductance is adjusted by adjusting the number of turns of the coil and the distance between the primary stages, and the whole integration of the resonance inductance is realized; the parasitic capacitance existing in the voltage doubling rectifying circuit and the secondary winding of the transformer is utilized, the number of layers of the secondary winding is designed, and the required equivalent capacitance is formed by reflecting the secondary winding to the primary winding through the transformer, so that the complete integration of the capacitors connected in parallel is realized, the final purpose of reducing the weight of the converter is achieved, and the light-weight design requirement of an aircraft is met.
The first air gap 7 is arranged between the middle columns of the magnetic core 1, the second air gap 8 is arranged between the side columns at two sides, and the magnetic core 1, the primary framework 3 and the secondary framework 5 of the transformer are of a concentric shaft structure; the primary framework 3, the secondary framework 5 and the magnetic shunt annular magnetic core 2 are independent structures;
after the magnetic core 1 forms a complete magnetic integrated transformer through the primary framework 3, the magnetic shunt annular magnetic core 2 and the secondary framework 5, the magnetic integrated transformer is fixed into a whole by using an insulating tape. The relative magnetic permeability of the magnetic shunt annular magnetic core 2 is not higher than that of the magnetic core 1;
the primary winding 4 is uniformly wound in the primary framework 3; the secondary winding 6 is wound in the secondary framework 5, the primary winding 4 adopts a common litz wire, and the secondary winding 6 adopts a polytetrafluoroethylene basic insulating wire.
The lightweight transformer is designed by adopting a lightweight transformer design method, and the design method comprises the following steps:
step S10, designing the thickness of the annular magnetic core of the magnetic shunt to realize the leakage inductance of the transformer as the resonance inductance;
and step S20, realizing the integration of the parallel capacitor by using the secondary winding of the transformer and the parasitic capacitor in the voltage-doubling rectifying circuit.
Specifically, parameters in the magnetically integrated transformer are designed. The external dimensions of the single magnetic integrated transformer are shown in fig. 2, wherein step S10 includes:
step S11, according to the design of the resonance inductance needed by LCC, the leakage inductance of the transformer with the magnetic shunt annular magnetic core structure is designed to be equal to the needed resonance inductance, and the thickness of the magnetic shunt annular magnetic core is solved through a formula (1):
wherein a, b are determined by the following formula:
a＝R c2 +0.5(R 5 +R 6 +R c1 +2R cc +2R 7 )； (2)
wherein the magnetic resistance R c1 、R c2 、R 5 、R 6 、R 7 And R cc Comprises the following steps:
wherein, L is resonance inductance needed by LCC converter, N p For the number of windings per layer of the primary winding, k p The number of primary winding layers, Ac the area of transformer magnetic pole, mu i Being a core or magnetic shunt toroidal core relative permeability, mu 0 Is the air permeability, /) g Is the first or second gap width,/ c2 The distance from the side column of the magnetic core to the center column of the magnetic core, b w Width of the core window, b d Is the thickness of the side pole of the magnetic core, W c Is the thickness of the magnetic core, /) c1 Is the magnetic core side column length, h 1 Is the distance h from the annular magnetic core of the magnetic shunt to the upper end of the central column of the magnetic core 2 The distance from the annular magnetic core of the magnetic shunt to the lower end of the central column of the magnetic core is as follows.
In step S20, the number of layers of the secondary winding of the transformer is designed according to the required parallel capacitor, and step S20 can be divided into the following small steps:
step S21, calculating the capacitance value of the first equivalent capacitor;
step S22, calculating the capacitance value of the second equivalent capacitor according to the capacitance value of the first equivalent capacitor;
and step S23, calculating the number of layers of the secondary winding of the transformer.
The capacitance value of the first equivalent capacitance is determined by equation (10):
wherein, C eq1 Is the capacitance value of the first equivalent capacitor; c D1 And C D2 Is the capacitance of the high voltage diode body, N S Number of secondary winding turns, N p Is the number of primary winding turns.
The method comprises the steps of firstly calculating parasitic capacitance formed by reflection of a voltage doubling rectifying circuit to a primary side, wherein the value is fixed, and a second equivalent capacitance needs to be obtained by designing the number of layers of a secondary winding of a transformer.
The capacitance value of the second equivalent capacitor is determined by equation (11):
wherein N is p To, the number of primary winding turns, N s Number of secondary winding turns, C P Parallel capacitance, C, required for LCC converters Wdg Is the parasitic capacitance of the secondary winding of the transformer. And calculating a second equivalent capacitor to be designed through the step, wherein the second equivalent capacitor is realized by designing the number of layers of the secondary winding of the transformer.
And (3) calculating the number of layers of the secondary winding of the transformer by adopting a formula (12):
wherein, C Wdg ≤4C 0 ；
The parameters in equation (12) are determined by the following equation:
wherein N is P For the number of turns of the primary winding of the transformer, N S For the number of transformer secondary winding turns, HLT (N) S ) Is the secondary average winding length, N layer Number of secondary winding layers, e, of transformer 0 Is the dielectric constant of air, epsilon D Is the relative dielectric constant of the secondary winding insulation sheath, delta is the thickness of the secondary winding insulation sheath, d 0 Is the copper line center distance.
As shown in fig. 3, the external dimensions of the magnetic core 1 and the magnetic shunt annular magnetic core 2 are marked.
Fig. 4 is a schematic diagram of the magnetic circuit of the integrated transformer shown in fig. 1.
Fig. 5 shows an equivalent circuit of the transformer shown in fig. 1.
The invention also aims to provide a light-weight high-voltage power supply for electroaerodynamic propulsion, aiming at realizing light weight and high power density of the high-voltage power supply; in order to achieve the purpose, the adopted means is as follows: the main circuit adopts a structure of full-bridge inversion-magnetic integrated transformer bank-voltage-multiplying rectification output; the insulating material uses the light solidifiable insulating glue and is insulated in a filling and sealing mode; the control uses a feed-forward constant power control and arc suppression circuit.
The invention provides a light-weight integrated transformer for an electro-aerodynamic propulsion high-voltage power supply, which has the characteristics of high integration level and light weight, and can integrate LCC resonant inductance and excitation inductance in the transformer, thereby effectively improving the power density of an LCC resonant converter and realizing the light-weight design of the high-voltage power supply.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A light-weight transformer, characterized in that the transformer comprises: the magnetic shunt comprises a magnetic core, a magnetic shunt annular magnetic core, a primary framework, a primary winding, a secondary framework, a secondary winding, a first air gap and a second air gap;
the first air gap is positioned at the center pillar of the magnetic core;
the second air gap is located at a side column of the magnetic core;
the first and second air gaps are equal in width;
the annular magnetic core of the magnetic shunt penetrates through the magnetic core center pillar, and the distance from the top end of the magnetic core center pillar is equal to the groove width of the primary framework;
the magnetic core and the annular magnetic core of the magnetic shunt are made of the same material and have the same magnetic permeability;
the primary winding is uniformly wound in the primary framework by using litz wires;
the secondary winding is wound inside the secondary framework by using a high-voltage insulated wire.
2. The lightweight transformer according to claim 1, wherein said magnetic core, said primary bobbin, and said secondary bobbin are of a concentric axis structure.
3. The light-weight transformer of claim 1, wherein the primary bobbin, the secondary bobbin, and the magnetic shunt toroidal core are independent structures;
and after the magnetic core forms a complete magnetic integrated transformer through the primary framework, the magnetic shunt annular magnetic core and the secondary framework, the magnetic integrated transformer is fixed into a whole by using an insulating adhesive tape.
4. A light weight transformer as claimed in any one of claims 1 to 3, wherein the relative permeability of said magnetic shunt toroidal core is less than or equal to the relative permeability of said core.
5. A method for designing a lightweight transformer according to any one of claims 1 to 4, the method comprising:
designing the thickness of the annular magnetic core of the magnetic shunt to realize the leakage inductance of the transformer as resonance inductance;
and the integration of parallel capacitors is realized by using a secondary winding of the transformer and a parasitic capacitor in the voltage-multiplying rectifying circuit.
6. The method for designing a light-weight transformer according to claim 5, wherein the step of designing the thickness of the toroidal core of the magnetic shunt to realize the leakage inductance of the transformer as the resonant inductance specifically comprises the steps of:
according to the required harmonicThe leakage inductance of the transformer with the magnetic shunt annular magnetic core structure is equal to the required resonance inductance, and the thickness t of the magnetic shunt annular magnetic core sh Solved by the following formula:
wherein a, b are determined by the following formula:
a＝R c2 +0.5(R 5 +R 6 +R c1 +2R cc +2R 7 )；
wherein the magnetic resistance R c1 、R c2 、R 5 、R 6 、R 7 And R cc Comprises the following steps:
wherein, L is resonance inductance needed by LCC converter, N p For the number of windings per layer of the primary winding, k p The number of primary winding layers, Ac the area of transformer magnetic pole, mu i Being a core or magnetic shunt toroidal core relative permeability, mu 0 Is the air permeability, /) g Is the first or second gap width,/ c2 The distance from the side column of the magnetic core to the center column of the magnetic core, b w Width of the core window, b d Is the thickness of the side pole of the magnetic core, W c Is the thickness of the magnetic core, /) c1 Is the magnetic core side column length, h 1 Is the distance h from the annular magnetic core of the magnetic shunt to the upper end of the central column of the magnetic core 2 The distance from the annular magnetic core of the magnetic shunt to the lower end of the central column of the magnetic core is as follows.
7. The design method of a light-weight transformer according to claim 5, wherein the integration of the parallel capacitor by using the secondary winding of the transformer and the parasitic capacitor in the voltage-doubling rectifying circuit specifically comprises:
calculating the capacitance value of the first equivalent capacitor;
calculating the capacitance value of the second equivalent capacitor according to the capacitance value of the first equivalent capacitor;
and calculating the number of layers of the secondary winding of the transformer.
8. The method of claim 7, wherein the capacitance of the first equivalent capacitor is determined by the following equation:
wherein, C eq1 Is the capacitance value of the first equivalent capacitor; c D1 And C D2 Is the capacitance of the high voltage diode body, N S Number of secondary winding turns, N p Is the number of primary winding turns;
the capacitance value of the second equivalent capacitor is determined by the following formula:
wherein, C eq2 Is the capacitance value of the second equivalent capacitor, C P Parallel capacitance, C, required for LCC converters Wdg Is the parasitic capacitance of the secondary winding of the transformer.
9. The method of claim 8, wherein the calculating the number of secondary winding layers of the transformer is determined by the following formula:
The specific calculation mode of the parameters is as follows:
wherein, HLT (N) S ) Is the secondary average winding length, N layer Number of secondary winding layers, e, of transformer 0 Is the dielectric constant of air, epsilon D Is the relative dielectric constant of the insulating sheath of the secondary winding, delta isThickness of insulating sheath of secondary winding, d 0 Is the copper line center distance.
10. A light weight high voltage power supply for electro-aerodynamic propulsion, characterized in that it is provided with a light weight transformer according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210439240.6A CN114823092B (en) | 2022-04-25 | 2022-04-25 | Lightweight transformer, lightweight transformer design method and high-voltage power supply |
Applications Claiming Priority (1)
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| EP3758031A1 (en) * | 2019-06-27 | 2020-12-30 | Valeo Siemens eAutomotive France SAS | Electrical transformer with controlled distribution of leakage inductance |
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