Magnetic integration device based on SuperBuck converter for space navigation

Abstract

The invention relates to a magnetic integration device based on a SuperBuck converter for space navigation, and provides a magnetic integration device suitable for the topology of the SuperBuck converter aiming at the defect that the number of magnetic elements of the SuperBuck converter is large, two original inductors of the SuperBuck converter are wound on one magnetic core, the size of the magnetic elements is reduced, the power density of the SuperBuck converter is improved, and the magnetic integration device is suitable for the topology of the SuperBuck converter. Output ripples are controlled by controlling the size proportion of air gaps and the magnetic flux coupling direction, and the magnetic resistance meets a certain optimization relation by arranging the air gaps in the magnetic columns of the integrated magnetic piece.

Description

Technical Field

[0001] The invention relates to a magnetic integration device based on a SuperBuck converter for aerospace use, and belongs to the field of space power supply technology design. Background Art

[0002] In the space power module, the charging regulator charges the battery. When entering the shadow period, the battery achieves the stability of the output bus voltage in the shadow area through the discharge regulator. There are many circuit topologies for charging regulators to choose from, such as Buck, SuperBuck, Buck-Boost, etc. The SuperBcuk converter has the characteristics of the same input and output voltage polarity, relatively simple main circuit components, continuous input and output current, and small pulsation on the bus and battery. It has been widely used in aerospace power systems. Compared with the traditional Buck converter, the SuperBuck converter has an additional inductor, which not only increases the volume of the converter, but is also not conducive to improving the system power density. The power density has become an important indicator of the performance of modern switching power supplies. Increasing the frequency can effectively reduce the volume of magnetic components, but the proximity effect and skin effect brought by high frequency will also increase the loss of magnetic components, thereby limiting the increase in switching frequency. Therefore, in addition to increasing the frequency, magnetic integration technology is also an important way to improve the power density of the converter. Summary of the invention

[0003] The technical problem solved by the present invention is: in view of the problems of low power density and large high-frequency component loss in the traditional SuperBuck converter integrated design in the current prior art, a magnetic integration device based on aerospace SuperBuck converter is proposed.

[0004] The present invention solves the above technical problems by the following technical solutions:

[0005] A magnetic integration device based on a SuperBuck converter for aerospace use, comprising a magnetic integration module, a power module, a power conversion module, and an output load module;

[0006] The power module is used to supply power to the magnetic integration module, the power conversion module, and the output load module; the magnetic integration module realizes magnetic resistance setting and output ripple optimization through winding connection and air gap setting, and transmits the optimized output ripple to the power conversion module; the power conversion module filters and selects the received output ripple, obtains the filtered signal and outputs it to the output load module; the output load module receives the filtered signal and outputs the voltage to the outside by relying on the load element.

[0007] The magnetic integrated module includes an E-shaped magnetic core, a first winding, and a second winding;

[0008] The first magnetic column and the second magnetic column on the E-shaped magnetic core are used for inductor winding, the first magnetic column and the second magnetic column are symmetrically arranged, and both the first magnetic column and the second magnetic column are provided with air gaps; the first winding is wound on the first magnetic column, and the second winding is wound on the second magnetic column, and the winding directions of the first winding and the second winding are opposite.

[0009] One end of the first magnetic column is connected to the positive end of the DC power supply of the power module, one end of the second magnetic column is connected to the negative end of the DC power supply, the other end of the first magnetic column is connected to the input end of the power conversion module, and the other end of the second magnetic column is connected to the output end of the power conversion module.

[0010] The power conversion module includes a switch tube, a first capacitor, a second capacitor, and a diode;

[0011] The input end of the power conversion module is the common point of the switch tube and the first capacitor, and the output end of the power conversion module is the common point of the diode and the first capacitor; one end of the switch tube and the anode of the diode are respectively connected to the two ends of the first capacitor, the other end of the switch tube is connected to the cathode of the diode, and the two ends of the second capacitor are respectively connected to the cathode of the diode and the other end of the second magnetic column.

[0012] In the magnetic integrated module, the E-type magnetic core also includes a third magnetic column, and the third magnetic column does not undergo inductive winding. After the inductive winding of the first magnetic column and the second magnetic column is completed, the first winding and the second winding are designed in opposite winding directions to achieve magnetic flux cancellation of the first winding and the second winding on the middle magnetic column; the E-type magnetic core cancels out smaller magnetic flux losses and peak magnetic flux density through magnetic flux.

[0013] No air gap is set on the third magnetic column of the E-type magnetic core. The first magnetic column and the second magnetic column are used to control the size of the output ripple by controlling the size of the air gap and the number of turns of the corresponding winding. One end of the first winding is connected to the positive end of the input DC power supply, and the other end is connected to the input end of the power conversion module; one end of the second winding is connected to the negative end of the input DC power supply, and the other end is connected to the output end of the power conversion module.

[0014] In the E-type magnetic core, the first magnetic column, the second magnetic column and the third magnetic column are all selected from the magnetic columns on both sides and the middle magnetic column of the E-type magnetic core, and the E-type magnetic core selects the opening position of the corresponding air gap according to the magnetic columns processed by the selected winding.

[0015] The E-type magnetic core includes EI type and EE type. When the E-type magnetic core is selected as EI type and the magnetic columns on both sides are the first magnetic column and the second magnetic column, the first winding and the second winding are respectively wound on the two ends of the E-type magnetic core, and the winding cross-section winding directions are opposite. The third magnetic column is the middle magnetic column, and the middle magnetic column is not processed by inductance winding.

[0016] When the E-type magnetic core uses the middle magnetic column and the one side magnetic column as the first magnetic column and the second magnetic column, the winding cross-section winding directions are opposite, and the air gap is opened at the column end positions of the middle magnetic column and the one side magnetic column corresponding to the winding process.

[0017] When the E-type magnetic core is selected as EE type and the two side magnetic columns are the first magnetic column and the second magnetic column, the first winding and the second winding are respectively wound on the two ends of the E-type magnetic core, the winding cross-section winding directions are opposite, the third magnetic column is the middle magnetic column, and the middle magnetic column is not processed by inductance winding;

[0018] When the E-type magnetic core uses the middle magnetic column and the one side magnetic column as the first magnetic column and the second magnetic column, the winding cross-section winding directions are opposite, and the air gap is opened at the column end positions of the middle magnetic column and the one side magnetic column corresponding to the winding process.

[0019] The first winding and the second winding are wound with magnetic integrated inductors. A rectifier diode and two capacitors are provided in the power conversion module. The input DC voltage U in , Output load module output voltage U out Determine adjustments based on change requirements.

[0020] The advantages of the present invention compared with the prior art are:

[0021] The present invention provides a magnetic integration device based on a SuperBuck converter for aerospace use. Aiming at the characteristic of a large number of magnetic elements in the SuperBuck converter, a magnetic integration design is proposed by selecting magnetic columns and processing inductor windings. The design can not only reduce the volume of the magnetic elements, but also control the magnetic flux density and output ripple of the magnetic core by controlling the winding direction and the size of the air gap. By controlling the position and direction of the air gap and the winding of the winding, the magnetic fluxes in the magnetic columns of the common magnetic circuit cancel each other out, thereby reducing the peak magnetic flux density, which is beneficial to improving the output quality, conversion efficiency and power density of the SuperBuck converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Magnetic integration design examples provided for inventions Figure 1 ;

[0023] Figure 2 Magnetic integration design examples provided for inventions Figure 2 ;

[0024] Figure 3 Magnetic integration design examples provided for inventions Figure 3 ;

[0025] Figure 4 Magnetic integration design examples provided for inventions Figure 4 ; DETAILED DESCRIPTION

[0026] A magnetic integration device based on a SuperBuck converter for aerospace use is provided. Aiming at the disadvantage of a large number of magnetic components in a SuperBuck converter, the invention provides a magnetic integration device suitable for the topology of a SuperBuck converter. The two original inductors of the SuperBcuk converter are wound onto a magnetic core to reduce the volume of the magnetic components and improve the power density of the SuperBuck converter. The output ripple is controlled by controlling the air gap size ratio and the direction of magnetic flux coupling. An air gap is set in each magnetic column of the integrated magnetic component so that the magnetic resistance satisfies a certain optimization relationship.

[0027] A magnetic integration device based on aerospace SuperBuck converter, including a magnetic integration module, a power module, a power conversion module, and an output load module;

[0028] The power module is used to supply power to the magnetic integration module, the power conversion module, and the output load module; the magnetic integration module realizes magnetic resistance setting and output ripple optimization through winding connection and air gap setting, and transmits the optimized output ripple to the power conversion module; the power conversion module filters and selects the received output ripple, obtains the filtered signal and outputs it to the output load module; the output load module receives the filtered signal and outputs the voltage to the outside by relying on the load element.

[0029] The magnetic integrated module includes an E-shaped magnetic core, a first winding, and a second winding;

[0030] The first magnetic column and the second magnetic column on the E-shaped magnetic core are used for inductor winding, the first magnetic column and the second magnetic column are symmetrically arranged, and both the first magnetic column and the second magnetic column are provided with air gaps; the first winding is wound on the first magnetic column, and the second winding is wound on the second magnetic column, and the winding directions of the first winding and the second winding are opposite.

[0031] One end of the first magnetic column is connected to the positive end of the DC power supply of the power module, one end of the second magnetic column is connected to the negative end of the DC power supply, the other end of the first magnetic column is connected to the input end of the power conversion module, and the other end of the second magnetic column is connected to the output end of the power conversion module.

[0032] The power conversion module includes a switch tube, a first capacitor, a second capacitor, and a diode;

[0033] The input end of the power conversion module is the common point of the switch tube and the first capacitor, and the output end of the power conversion module is the common point of the diode and the first capacitor; one end of the switch tube and the anode of the diode are respectively connected to the two ends of the first capacitor, the other end of the switch tube is connected to the cathode of the diode, and the two ends of the second capacitor are respectively connected to the cathode of the diode and the other end of the second magnetic column.

[0034] In the magnetic integration module, the E-type magnetic core also includes a third magnetic column, and the third magnetic column does not undergo inductive winding. After the inductive winding of the first magnetic column and the second magnetic column is completed, the first winding and the second winding are designed in opposite winding directions to achieve magnetic flux cancellation of the first winding and the second winding on the middle magnetic column; the E-type magnetic core cancels out smaller magnetic flux losses and peak magnetic flux density through magnetic flux.

[0035] No air gap is set on the third magnetic column of the E-type magnetic core. The first magnetic column and the second magnetic column are used to control the size of the output ripple by controlling the size of the air gap and the number of turns of the corresponding winding. One end of the first winding is connected to the positive end of the input DC power supply, and the other end is connected to the input end of the power conversion module; one end of the second winding is connected to the negative end of the input DC power supply, and the other end is connected to the output end of the power conversion module.

[0036] In the E-type magnetic core, the first magnetic column, the second magnetic column and the third magnetic column are all selected from the magnetic columns on both sides and the middle magnetic column of the E-type magnetic core. The E-type magnetic core selects the opening position of the corresponding air gap according to the magnetic columns processed by the selected winding.

[0037] The E-type magnetic core includes EI type and EE type. When the E-type magnetic core is selected as EI type and the two side magnetic columns are the first magnetic column and the second magnetic column, the first winding and the second winding are respectively wound on the two ends of the E-type magnetic core, and the winding cross-section winding directions are opposite. The third magnetic column is the middle magnetic column, and the middle magnetic column is not processed with inductor winding.

[0038] When the E-type magnetic core uses the middle magnetic column and the one side magnetic column as the first magnetic column and the second magnetic column, the winding cross-section winding directions are opposite, and the air gap is opened at the column end positions of the middle magnetic column and the one side magnetic column corresponding to the winding process.

[0039] When the E-type magnetic core is selected as EE type and the two side magnetic columns are the first magnetic column and the second magnetic column, the first winding and the second winding are respectively wound on the two ends of the E-type magnetic core, the winding cross-section winding directions are opposite, the third magnetic column is the middle magnetic column, and the middle magnetic column is not processed by inductance winding;

[0040] When the E-type magnetic core uses the middle magnetic column and the one side magnetic column as the first magnetic column and the second magnetic column, the winding cross-section winding directions are opposite, and the air gap is opened at the column end positions of the middle magnetic column and the one side magnetic column corresponding to the winding process.

[0041] The first winding and the second winding are wound with magnetic integrated inductors. A rectifier diode and two capacitors are provided in the power conversion module. The input DC voltage U in , Output load module output voltage U out Determine adjustments based on change requirements.

[0042] The following is further described in conjunction with the accompanying drawings and preferred embodiments of the specification:

[0043] In the current embodiment, a magnetic integrated device suitable for the SuperBuck converter topology, the first part is composed of a DC power supply, the second part is the magnetic integrated device, which is composed of a group of closed E-type magnetic cores and windings N1 and N2, the third part is a power conversion unit composed of a switching tube, a diode, and an output filter capacitor; the fourth part is an output unit composed of an output load.

[0044] The magnetic integrated device has a set of closed E-shaped magnetic cores. A winding N1 is wound on one magnetic column (A) of the E-shaped magnetic core, and the winding direction of N1 is turn1 (marked as the winding direction of Turn1); a winding N2 is wound on another magnetic column (B) of the E-shaped magnetic core, and the winding direction of N2 is turn2 (marked as the winding direction of Turn2);

[0045] The magnetic columns where the windings N1 and N2 are located have an air gap; the c-end of the winding N2 of the magnetic integration device is interconnected with the negative end of the DC power supply, the b-end of the magnetic integration device N1 is interconnected with the common point of the switch tube Q1 and the capacitor C1, and the d-end of the magnetic integration device N2 is interconnected with the common point of the diode D1 and the capacitor C1; according to claim 3, one end of the switch tube Q1 of the power conversion unit and the anode of the diode D1 are respectively connected to the two ends of the capacitor C1, the other end of the switch tube is connected to the cathode of the diode D1, and the two ends of the capacitor C2 are respectively connected to the cathode of the diode D1 and the d-end of the magnetic integration device;

[0046] The magnetic integration device achieves the reduction of magnetic component volume and the minimization of output ripple through appropriate winding connection and optimized magnetic resistance setting. The magnetic integration element includes a magnetic core and a winding N1 of an inductor L1 and a winding N2 of an inductor L2. The magnetic core has three magnetic columns. The winding N1 of the inductor L1 is wound on one magnetic column, and the winding N2 of the inductor L2 is wound on another magnetic column. The air gap and the winding direction of the windings N1 and N2 are reasonably set so that the magnetic fluxes of L1 and L2 cancel each other on the magnetic column without the coil wound, which can reduce the peak magnetic flux density of the magnetic core and thus reduce the magnetic flux loss. The magnetic integration element is also characterized in that the magnetic column where the winding N1 is located has an air gap, the magnetic column where the winding N2 is located has an air gap, and the magnetic column where the coil is not wound has no air gap; the magnetic integration device is also characterized in that the size of the output ripple can be controlled by controlling the size of the air gap and the number of turns of the winding.

[0047] The magnetic integrated device is also characterized in that one end a of the winding N1 is connected to the positive end of the input DC power supply, and the other end b thereof is interconnected with the capacitor C1 and the switch tube Q; one end c of the winding N2 is connected to the negative end of the input DC power supply, and the other end d thereof is interconnected with the capacitors C1, C2 and the diode D1.

[0048] Main symbol names in the attached drawings: U inis the input DC voltage, Q1 is the power tube, D1 and D2 are rectifier diodes, L1 and L2 are magnetic integrated inductors, N1 and N2 are magnetic integrated inductors L1 and L2 windings respectively;

[0049] like Figure 1 As shown, the positive end of the DC power supply 1 is connected to the a end of the integrated magnetic component 2, and the secondary end of the DC power supply 1 is connected to the c end of the integrated magnetic component 2; the source of the MOS tube Q1 is connected to the cathode of the diode D1, and the two ends of the filter power supply C1 are respectively connected to the gate of the MOS tube Q1 and the anode of the diode D1, the connection point of the filter power supply C1 and the gate of the MOS tube Q1 is connected to the b end of the integrated magnetic component 2, and the connection point of the filter power supply C1 and the anode of the diode D1 is connected to the d end of the integrated magnetic component 2; one end of the filter capacitor C2 is connected to the source of the MOS tube Q1, the cathode of the diode D1, and the positive end of the output voltage 4; the other end of the filter capacitor C2 is connected to the connection point of the filter power supply C1 and the anode of the diode D1, the d end of the integrated magnetic component 2, and the negative end of the output voltage 4;

[0050] The magnetic core of the integrated magnetic element 2 is of EI type, and the windings of the inductors L1 and L2 are respectively wound on the two ends of the E-shaped magnetic core, characterized in that the winding directions of the two winding sections are opposite, and also characterized in that the air gaps are opened on the side columns at the two ends of the magnetic core;

[0051] like Figure 2 As shown, it is embodiment 2 of the present invention, and its connection method is the same as that of embodiment 1 of the present invention, which will not be repeated; the magnetic core of the integrated magnetic component 2 is EI type, and the windings of the inductors L1 and L2 are respectively wound on the middle column and one end of the edge of the EI-shaped magnetic core, which is characterized in that the winding directions of the two winding sections are opposite, and it is also characterized in that the air gap is opened at the middle column and the end of the edge column where the winding is located;

[0052] like Figure 3 As shown, it is embodiment 3 of the present invention, and its connection mode is the same as that of embodiment 1 of the present invention, and will not be repeated; the magnetic core of the integrated magnetic component 3 is EE-type, and the windings of the inductors L1 and L2 are respectively wound on the two ends of the EE-shaped magnetic core, which is characterized in that the winding directions of the two winding sections are opposite, and it is also characterized in that the air gap is opened on the side columns at both ends of the magnetic core;

[0053] like Figure 4 As shown, it is embodiment 4 of the present invention, and its connection method is the same as that of embodiment 4 of the invention, which will not be repeated; the magnetic core of the integrated magnetic element 4 is EE-type, and the windings of the inductors L1 and L2 are respectively wound on the middle column and one end of the edge of the EE-shaped magnetic core, which is characterized in that the winding directions of the two winding sections are opposite, and it is also characterized in that the air gap is opened at the middle column and the end of the edge column where the winding is located;

[0054] The two inductors of the existing SuperBuck converter are mostly wound on two separate magnetic cores. The present invention controls the air gap and the position and direction of the winding so that the magnetic fluxes in the magnetic columns of the common magnetic circuit cancel each other out, thereby reducing the peak magnetic flux density.

[0055] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0056] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A magnetic integration device based on aerospace SuperBuck converter, characterized in that: It includes magnetic integration module, power supply module, power conversion module and output load module; The power module is used to supply power to the magnetic integration module, the power conversion module, and the output load module; the magnetic integration module realizes magnetic resistance setting and output ripple optimization through winding connection and air gap setting, and transmits the optimized output ripple to the power conversion module; the power conversion module filters and selects the received output ripple, obtains the filtered signal and outputs it to the output load module; The output load module receives the filtered signal and outputs voltage to the outside through the load element.

2. The magnetic integration device based on the aerospace SuperBuck converter according to claim 1, characterized in that: The magnetic integrated module includes an E-shaped magnetic core, a first winding, and a second winding; The first magnetic column and the second magnetic column on the E-shaped magnetic core are used for inductor winding, the first magnetic column and the second magnetic column are symmetrically arranged, and both the first magnetic column and the second magnetic column are provided with air gaps; the first winding is wound on the first magnetic column, and the second winding is wound on the second magnetic column, and the winding directions of the first winding and the second winding are opposite.

3. The magnetic integration device based on the aerospace SuperBuck converter according to claim 2, characterized in that: One end of the first magnetic column is connected to the positive end of the DC power supply of the power module, one end of the second magnetic column is connected to the negative end of the DC power supply, the other end of the first magnetic column is connected to the input end of the power conversion module, and the other end of the second magnetic column is connected to the output end of the power conversion module.

4. The magnetic integration device based on aerospace SuperBuck converter according to claim 1, characterized in that: The power conversion module includes a switch tube, a first capacitor, a second capacitor, and a diode; The input end of the power conversion module is the common point of the switch tube and the first capacitor, and the output end of the power conversion module is the common point of the diode and the first capacitor; one end of the switch tube and the anode of the diode are respectively connected to the two ends of the first capacitor, the other end of the switch tube is connected to the cathode of the diode, and the two ends of the second capacitor are respectively connected to the cathode of the diode and the other end of the second magnetic column.

5. The magnetic integration device based on aerospace SuperBuck converter according to claim 1, characterized in that: In the magnetic integrated module, the E-type magnetic core also includes a third magnetic column, and the third magnetic column does not undergo inductive winding. After the inductive winding of the first magnetic column and the second magnetic column is completed, the first winding and the second winding are designed in opposite winding directions to achieve magnetic flux cancellation of the first winding and the second winding on the middle magnetic column; the E-type magnetic core cancels out smaller magnetic flux losses and peak magnetic flux density through magnetic flux.

6. The magnetic integration device based on aerospace SuperBuck converter according to claim 1, characterized in that: No air gap is set on the third magnetic column of the E-type magnetic core. The first magnetic column and the second magnetic column are used to control the size of the output ripple by controlling the size of the air gap and the number of turns of the corresponding winding. One end of the first winding is connected to the positive end of the input DC power supply, and the other end is connected to the input end of the power conversion module; one end of the second winding is connected to the negative end of the input DC power supply, and the other end is connected to the output end of the power conversion module.

7. The magnetic integration device based on the aerospace SuperBuck converter according to claim 6, characterized in that: In the E-type magnetic core, the first magnetic column, the second magnetic column and the third magnetic column are all selected from the magnetic columns on both sides and the middle magnetic column of the E-type magnetic core, and the E-type magnetic core selects the opening position of the corresponding air gap according to the magnetic columns processed by the selected winding.

8. The magnetic integration device based on the aerospace SuperBuck converter according to claim 7, characterized in that: When the E-type magnetic core is selected as the EI type and the two side magnetic columns are the first magnetic column and the second magnetic column, the first winding and the second winding are respectively wound on the two ends of the E-type magnetic core, the winding cross-section winding directions are opposite, the third magnetic column is the middle magnetic column, and the middle magnetic column is not processed by inductance winding; When the E-type magnetic core uses the middle magnetic column and the one side magnetic column as the first magnetic column and the second magnetic column, the winding cross-section winding directions are opposite, and the air gap is opened at the column end positions of the middle magnetic column and the one side magnetic column corresponding to the winding process.

9. The magnetic integration device based on aerospace SuperBuck converter according to claim 7, characterized in that: When the E-type magnetic core is selected as EE type and the two side magnetic columns are the first magnetic column and the second magnetic column, the first winding and the second winding are respectively wound on the two ends of the E-type magnetic core, the winding cross-section winding directions are opposite, the third magnetic column is the middle magnetic column, and the middle magnetic column is not processed by inductance winding; When the E-type magnetic core uses the middle magnetic column and the one side magnetic column as the first magnetic column and the second magnetic column, the winding cross-section winding directions are opposite, and the air gap is opened at the column end positions of the middle magnetic column and the one side magnetic column corresponding to the winding process.

10. The magnetic integration device based on aerospace SuperBuck converter according to claim 7, characterized in that: The first winding and the second winding are wound with magnetic integrated inductors. A rectifier diode and two capacitors are provided in the power conversion module. The input DC voltage U in , Output load module output voltage U out Determine adjustments based on change requirements.

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