CN214897986U - Series coupling inductor, direct current converter and hybrid electric vehicle - Google Patents
Series coupling inductor, direct current converter and hybrid electric vehicle Download PDFInfo
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- CN214897986U CN214897986U CN202120678238.5U CN202120678238U CN214897986U CN 214897986 U CN214897986 U CN 214897986U CN 202120678238 U CN202120678238 U CN 202120678238U CN 214897986 U CN214897986 U CN 214897986U
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Abstract
The utility model discloses a series coupling inductor, which comprises a magnetic core and a winding; the magnetic core is in a shape of Chinese character 'ri', the upper and lower transverse columns are respectively used as a first inductance column and a second inductance column, the middle transverse column is used as a magnetic core common column, and the left and right vertical plates are used as the back of the magnetic core; the first inductance column, the second inductance column and the back of the magnetic core are all free of air gaps; the common column of the magnetic core is disconnected with an air gap; the first inductance column is wound with a first inductance winding, and the second inductance column is wound with a second inductance winding. The utility model also discloses a direct current converter and hybrid vehicle. The utility model discloses, reduced the inductance volume when can increase the inductance value, simple structure, low in production cost, eddy current loss is little, has effectively improved the inductance heat dissipation.
Description
Technical Field
The utility model relates to an automotive electronics technique, in particular to serial-type coupling inductance, direct current converter and hybrid vehicle.
Background
Along with the increasingly important environmental protection requirements of social development, the energy conservation and emission reduction of the automobile industry are under increasing pressure, 48V micro-hybrid systems are researched more and more, the standard voltage of automobile equipment is increased to 48V for use, the power of the whole system is improved, the working conditions of starting and stopping an engine, starting, braking and the like can be better optimized, and the oil saving efficiency is greatly improved; the circuit commonly adopted in the automobile 48V electric energy conversion unit direct current converter is a bidirectional Buck-Boost circuit, the circuit can be shown in figure 1, the circuit adopts a plurality of Buck circuits in parallel when the circuit is converted from 48V to 12V, the plurality of Buck circuits in parallel when the circuit is converted from 12V to 48V in the reverse direction, and the phases of all the phases are mutually staggered. In this circuit, one filter inductor is required for each parallel branch as shown in fig. 1 (L)1、L2……Ln) The inductor serves to store energy and filter ripple current. The inductance is usually made by independent inductance of each phase, and designed separately, the specific structure is shown in fig. 2, the inductance winding is wound on the magnetic core center pillar, the winding can be a PCB winding or a copper wire winding, the magnetic core center pillar is opened with an air gap according to the requirement of inductance, the inductance magnetic core can be a combination of two symmetrical E-type magnetic cores or a combination of a single winding E-type magnetic core and an I piece (sheet-shaped magnetic core), and the inductance magnetic flux forms a loop through the side pillar. The existing common inductor is generally designed for an external independent inductor, the external independent inductor product is from a first-level supplier product, and a huge cost bottleneck is generated in the aspect of converter cost control, so that the planar inductor mode of fastening a PCB winding by a magnetic core is more and more widely applied. The planar inductor refers to a mode of magnetic core + PCB winding, the inductor is not independent of a main power PCB (printed circuit board), the winding part of the inductor is realized by the PCB, then the winding part of the inductor is directly assembled and formed by directly using a proper magnetic core and a converter developer, the processing of an intermediate link of an inductor supplier is omitted, and the cost is very advantageous at present, but the planar inductor is arranged in a limited layout space along with the improvement of the power density requirement and the control of the converter costIn the middle, the existing magnetic core is used for buckling the planar inductor of the PCB winding, the process of pasting the copper bar outside the PCB winding and the winding is complex, the maximum number of turns is limited, the design inductance is limited, the saturation flux of the material is limited, and the inductance is difficult to further increase; however, the inductance with relatively large inductance reduces the current ripple, and the selection of other components and the EMC (electromagnetic compatibility) design can be greatly improved.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a serial-type coupling inductance has reduced the inductance volume when can increase the inductance value, simple structure, low in production cost, and eddy current loss is little, has effectively improved the inductance heat dissipation.
In order to solve the above technical problem, the present invention provides a series coupling inductor, which includes a magnetic core 1 and a winding;
the magnetic core 1 is in a shape of Chinese character 'ri', the upper and lower transverse columns of the magnetic core are respectively used as a first inductance column 11 and a second inductance column 12, the middle transverse column is used as a magnetic core common column 13, and the left and right vertical plates of the magnetic core are used as a magnetic core back 10;
the first inductance column 11, the second inductance column 12 and the magnetic core back 10 are all free of air gaps;
the magnetic core common column 13 is disconnected with an air gap;
a first inductor winding 31 is wound around the first inductor leg 11 and a second inductor winding 32 is wound around the second inductor leg 12.
Preferably, the first inductance column 11 and the second inductance column 12 are cylinders, elliptic cylinders or prisms.
Preferably, the magnetic core 1 is formed by combining two symmetrical E-shaped magnetic cores.
Preferably, the magnetic core 1 is formed by combining an "E" shaped magnetic core and an "I" shaped sheet magnetic core.
Preferably, the first inductance winding 31 and the second inductance winding 32 are formed by winding flat wires.
Preferably, the first inductance winding 31 and the second inductance winding 32 are PCB windings or copper wire windings.
Preferably, the air gap of the magnetic core common pillar 13 is 1% to 10% of the lateral length of the magnetic core common pillar 13.
The utility model also provides an with serial-type coupling inductance as filter inductance's direct current converter, two inductance windings of serial-type coupling inductance concatenate the back, and one end is through a filter capacitance ground connection to the electric current that flows through two windings is clockwise or is anticlockwise together.
Preferably, N series coupling inductors are connected in series to serve as the filter inductor, and N is an integer greater than 1.
Preferably, the circuit topology of the dc converter is a Buck voltage-reducing circuit, a Boost voltage-increasing circuit or a Buck-Boost polarity-reversal voltage-increasing circuit.
The utility model also provides an adopt direct current converter carry out the hybrid vehicle of high voltage with the low-voltage power transform.
Preferably, the hybrid electric vehicle adopts a 48V micro-hybrid system, the high voltage is 48V, and the low voltage is 12V.
The utility model discloses a serial-type coupling inductance, replace two windings that can establish ties in the circuit with the discrete planar inductance, two windings utilize serial-type coupling inductance to realize, wherein magnetic core public post 13 and magnetic core back 10 share, only set up the air gap at magnetic core public post 13, because two windings of this serial-type coupling inductance have shared magnetic core public post 13, thereby reduce the volume of two integrated back magnetic cores of winding, when can increase the inductance volume through establishing ties two windings, the inductance volume has been reduced, because simple structure, inductance manufacturing cost has also been reduced; in addition, the inductor air gap is only arranged on the magnetic core common column 13, and no winding wraps the air gap, so that the eddy current loss at the air gap is greatly reduced, and the heat dissipation of the inductor is effectively improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required for the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a bidirectional Buck-Boost circuit diagram;
FIG. 2 is a schematic diagram of a conventional filter inductor structure;
fig. 3 is a schematic structural diagram of an embodiment of the series coupling inductor of the present invention;
fig. 4 is a schematic diagram of an access circuit of an embodiment of the series coupling inductor of the present invention;
fig. 5 is an equivalent circuit diagram of the series coupling inductor of the present invention;
fig. 6 is a circuit diagram of an embodiment of the dc converter with the series coupling inductor as the filter inductor according to the present invention.
The reference numbers in the figures illustrate:
1 a magnetic core; 10 magnetic core back; 11 a first inductive column; 12 a second inductor leg; 13 magnetic core common column; 31 a first inductor winding; 32 second inductor winding.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 3, the series coupling inductor includes a magnetic core 1 and a winding;
the magnetic core 1 is in a shape of Chinese character 'ri', the upper and lower transverse columns of the magnetic core are respectively used as a first inductance column 11 and a second inductance column 12, the middle transverse column is used as a magnetic core common column 13, and the left and right vertical plates of the magnetic core are used as a magnetic core back 10;
the first inductance column 11, the second inductance column 12 and the magnetic core back 10 are all free of air gaps;
the magnetic core common column 13 is disconnected with an air gap;
a first inductor winding 31 is wound around the first inductor leg 11 and a second inductor winding 32 is wound around the second inductor leg 12.
Preferably, the first inductance column 11 and the second inductance column 12 are cylinders, elliptic cylinders or prisms.
Preferably, the magnetic core 1 is formed by combining two symmetrical E-shaped magnetic cores.
Preferably, the magnetic core 1 is formed by combining an "E" shaped magnetic core and an "I" shaped sheet magnetic core.
Preferably, the first inductance winding 31 and the second inductance winding 32 are formed by winding flat wires.
Preferably, the first inductance winding 31 and the second inductance winding 32 are PCB windings or copper wire windings.
Preferably, the air gap of the magnetic core common pillar 13 is 1% to 10% of the lateral length of the magnetic core common pillar 13.
When the series coupling inductor is connected into a circuit, the two windings are connected in series, and the current inlet end and the current outlet end of the two inductance windings can be adjusted, so that the current flowing through the two windings is clockwise or anticlockwise, the magnetic core common column 13 and the magnetic core back 10 are a common magnetic circuit, and the magnetic fluxes of the two inductance columns form a closed loop through the common magnetic circuit, as shown in fig. 4.
The magnetic circuit schematic diagram can be equivalently shown in fig. 5, wherein ac represents ripple current, dc represents direct current, current in a single inductance winding consists of alternating current component and direct current component, and the direct current component generates direct current magnetic flux phi at an inductance columndcThe AC current component generates an AC magnetic flux phi in the inductive poleacThe magnetic flux passing through the core common column 13 is phi1The magnetic flux passing through the first inductive pole 11 is phi01The magnetic flux through the second inductive pole 12 is phi02. Because the magnetic core common column 13 is provided with an air gap, the magnetic resistance R of the magnetic core common column 13 is ensured1Will be much larger than the first magnetic circuit reluctance R formed by the magnetic core back 10 and the first inductance column 1101And a second magnetic circuit reluctance R formed by the magnetic core back 10 and the second inductance column 1202The coupling effect between the ac and dc magnetic fluxes of the two inductor columns is good, and in the magnetic circuit of the magnetic core back 10 and the magnetic core common column 13, the two inductors have the same current direction due to the two windingsDirect current magnetic flux and alternating current magnetic flux generated by the column are mutually superposed in the magnetic circuits of the back part and the magnetic core common column 13, and the problem of magnetic core saturation caused by multipath non-uniform current of the common multipath coupling inductor is solved.
In the series coupling inductor of the first embodiment, a discrete planar inductor is replaced by two windings which can be connected in series in a circuit, the two windings are realized by using the series coupling inductor, wherein the magnetic core common column 13 and the magnetic core back 10 are shared, only the magnetic core common column 13 is provided with an air gap, and the two windings of the series coupling inductor share the magnetic core common column 13, so that the volume of the magnetic core after the two windings are integrated is reduced, the inductance can be increased by connecting the two windings in series, the inductance volume is reduced, and the production cost of the inductor is also reduced due to the simple structure; in addition, the inductor air gap is only arranged on the magnetic core common column 13, and no winding wraps the air gap, so that the eddy current loss at the air gap is greatly reduced, and the heat dissipation of the inductor is effectively improved.
Example two
As shown in fig. 6, in a dc converter using the series coupling inductor of the first embodiment as a filter inductor, after two inductor windings of the series coupling inductor are connected in series, one end of the series coupling inductor is grounded through a filter capacitor, and the current flowing through the two windings is clockwise or counterclockwise.
In fig. 6, M is the mutual inductance between the first inductor winding 31 and the second inductor winding 32, L11 is the self-inductance of the first inductor winding 31, and L12 is the self-inductance of the second inductor winding 32.
Preferably, N series-coupled inductors are connected in series to serve as the filter inductor, where N is an integer greater than 1, such as 2, 3, or 4 … ….
Preferably, the circuit topology of the dc converter is a Buck voltage-reducing circuit, a Boost voltage-increasing circuit or a Buck-Boost polarity-reversal voltage-increasing circuit.
EXAMPLE III
A hybrid electric vehicle which adopts the DC converter of the second embodiment to carry out high-voltage and low-voltage power conversion.
Preferably, the hybrid electric vehicle adopts a 48V micro-hybrid system, the high voltage is 48V, and the low voltage is 12V.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A series coupling inductor is characterized by comprising a magnetic core (1) and a winding;
the magnetic core (1) is in a shape of Chinese character 'ri', the upper and lower transverse columns of the magnetic core are respectively used as a first inductance column (11) and a second inductance column (12), the middle transverse column is used as a magnetic core common column (13), and the left and right vertical plates are used as magnetic core backs (10);
the first inductance column (11), the second inductance column (12) and the magnetic core back (10) are all free of air gaps;
the magnetic core common column (13) is disconnected with an air gap;
a first inductance winding (31) is wound on the first inductance column (11), and a second inductance winding (32) is wound on the second inductance column (12).
2. The series-coupled inductor of claim 1,
the first inductance column (11) and the second inductance column (12) are cylinders, elliptic cylinders or prisms.
3. The series-coupled inductor of claim 1,
the magnetic core (1) is formed by combining two symmetrical E-shaped magnetic cores.
4. The series-coupled inductor of claim 1,
the magnetic core (1) is formed by combining an E-shaped magnetic core and an I-shaped sheet magnetic core.
5. The series-coupled inductor of claim 1,
the first inductance winding (31) and the second inductance winding (32) are formed by winding flat conducting wires.
6. The series-coupled inductor of claim 1,
the first inductance winding (31) and the second inductance winding (32) are PCB windings or copper wire windings.
7. The series-coupled inductor of claim 1,
the air gap of the magnetic core common column (13) is 1-10% of the transverse length of the magnetic core common column (13).
8. A DC converter using the series-connected coupling inductor as the filter inductor according to any one of claims 1 to 7, wherein after the two inductor windings of the series-connected coupling inductor are connected in series, one end of the series-connected coupling inductor is grounded through a filter capacitor, and the current flowing through the two windings is clockwise or counterclockwise.
9. The DC converter according to claim 8,
n series coupling inductors are connected in series to serve as filter inductors, and N is an integer larger than 1.
10. The DC converter according to claim 8,
the circuit topology of the direct current converter is a Buck voltage reduction type circuit, a Boost voltage reduction type circuit or a Buck-Boost polarity inversion voltage reduction type circuit.
11. A hybrid vehicle using the dc converter of claim 8 for high voltage to low voltage power conversion.
12. The hybrid vehicle according to claim 11,
the hybrid electric vehicle adopts a 48V micro-hybrid system, the high voltage is 48V, and the low voltage is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120678238.5U CN214897986U (en) | 2021-04-02 | 2021-04-02 | Series coupling inductor, direct current converter and hybrid electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120678238.5U CN214897986U (en) | 2021-04-02 | 2021-04-02 | Series coupling inductor, direct current converter and hybrid electric vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214897986U true CN214897986U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120678238.5U Active CN214897986U (en) | 2021-04-02 | 2021-04-02 | Series coupling inductor, direct current converter and hybrid electric vehicle |
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| Country | Link |
|---|---|
| CN (1) | CN214897986U (en) |
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- 2021-04-02 CN CN202120678238.5U patent/CN214897986U/en active Active
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