CN104300802A - Single-stage boost inverter with magnetic integration transformer - Google Patents

Abstract

The invention provides a single-stage boost inverter using a magnetic integrated transformer, including a DC power supply (1), a single-stage boost network (2) and an inverter circuit (3), characterized in that: the DC power supply (1) Including a power supply and an inductor L3, the single-stage boost inverter adopts an integrated magnetic part (7) as a magnetic integrated transformer, and the magnetic integrated magnetic part (7) includes magnetic cores arranged oppositely. The magnetic core is respectively wound with the primary winding (n1), the secondary winding (n2) and the winding (n3) of the inductor L3, the input terminal of the primary winding (n1) is connected to the primary circuit, and the secondary winding (n2) The output end is connected to the secondary circuit; the winding (n3) of the inductor L3 is connected to the positive pole of the power supply, and the other end is connected to the single-stage boost network (2); the primary winding (n1) and the secondary winding (n2 ) consists of coupled inductance or tapped inductance; there is an air gap between the magnetic columns of the magnetic core set opposite to each other; the inverter can not only reduce the volume of the magnetic parts, but also make the leakage inductance easy to control and reduce the copper of the winding damage.

Description

A Single-Stage Boost Inverter Using Magnetic Integrated Transformer

technical field

The invention belongs to the field of power electronic devices, and relates to a magnetic integrated converter, in particular to a single-stage boost inverter composed of coupled inductors or tapped inductors.

Background technique

A single-stage boost inverter (CL-SSBI or TL-SSBI) constructed with coupled inductors or tapped inductors is a passive network including capacitors and inductors inserted between the input power supply and the inverter bridge to form an impedance source inverter device. They use the "straight-through zero vector" state that is not allowed by traditional voltage source inverters, and adjust the turn ratio of coupled inductors or tapped inductors to realize the buck-boost function. Their advantages are concentrated in:

(1) By controlling the straight-through time of the bridge arm, the single-stage buck-boost conversion function is realized, and the voltage on the AC side can be lower or higher than the voltage on the input DC side, providing the ability to overcome the voltage drop;

(2) Since the straight-through of the inverter bridge arm becomes a normal working mode of the inverter, the inverter bridge will not be damaged due to the wrong conduction or turn-off of the switch tube, which improves the reliability of the whole machine;

(3) Since there is no need for dead zone compensation (voltage source type), the distortion of the output voltage waveform is fundamentally avoided.

In recent years, a variety of single-stage boost inverters have been proposed for motor drive systems where the DC bus needs to be powered by a low-voltage boost and new energy power generation inverters that adapt to a large input voltage range, including: Huang Wenxin, Hu Yuwen, Yang Qi , "Single-stage step-up inverter" (invention patent: ZL 2009 1 0181639.3); Zhou Yufei, Huang Wenxin, "A single-stage step-up inverter" (invention patent: ZL 2011 1 0046688.3); Zhou Yufei, Huang Wenxin, Hu Yuwen, "Single-stage boost inverter with tapped inductor" (invention patent: 201110203219.8); Zhou Yufei, Huang Wenxin, "Single-stage boost inverter" (invention patent: 201310283970.2); Li Chunjie, Huang Wenxin, "A single-stage step-up inverter" (invention patent: 201310358565.2). These patents all use coupled inductors or tapped inductors to complement the topology family of single-stage boost inverters. However, they all use discrete magnetic parts, which require a large number of magnetic cores and large volumes, resulting in high system costs and low power density.

Contents of the invention

Technical problems to be solved:

In view of the large volume of discrete magnetic parts of single-stage boost inverters composed of coupled inductors or tapped inductors, a magnetically integrated CL-SSBI or magnetically integrated TL-SSBI is provided. Coupled inductors or tapped inductors and inductors are designed as integrated magnetic parts, and the converter can reduce the volume of magnetic parts and increase power density.

Technical solutions:

In order to achieve the above functions, the present invention provides a single-stage boost inverter using a magnetic integrated transformer, including a DC power supply 1, a single-stage boost network 2 and an inverter circuit 3, characterized in that: the DC power supply 1 Including a power supply and an inductance L3, the single-stage boost inverter adopts an integrated magnetic part 7 as a magnetic integrated transformer, and the magnetic integrated magnetic part 7 includes oppositely arranged magnetic cores, and the oppositely arranged magnetic cores are respectively wound with original The side winding n1, the secondary winding n2 and the winding n3 of the inductor L3, the input terminal of the primary winding n1 is connected to the primary circuit, and the output terminal of the secondary winding n2 is connected to the secondary circuit; the winding n3 of the inductor L3 is connected to On the positive pole of the power supply, the other end is connected to a single-stage boosting network 2; the primary winding n1 and the secondary winding n2 are composed of coupled inductors or tapped inductors; there are air gaps between the magnetic columns of the oppositely arranged magnetic cores. The primary winding n1, the secondary winding n2, and the winding n3 of the inductor L3 are planar windings or wound windings.

The magnetic cores arranged oppositely are one pair or two pairs connected in parallel.

As a preferred design, the oppositely arranged magnetic cores are oppositely arranged EE magnetic cores, the primary winding n1 and the secondary winding n2 are respectively wound on the two central columns of the EE magnetic core, and the winding n3 of the inductance L3 is wound on the magnetic core on the side posts on either side.

As a preferred design, it also includes an I-shaped magnetic core, the oppositely arranged magnetic core is a UU magnetic core with opposite openings, the I-shaped magnetic core is arranged in the middle of the UU magnetic core, and the primary winding n1 and the secondary winding n2 are wound On the same U-shaped magnetic core, the winding n3 of the inductor L3 is wound on another U-shaped magnetic core.

As a preferred design, the pair of magnetic cores provided is an EI magnetic core, and the E-shaped magnetic core is arranged towards the I-shaped magnetic core. The primary winding n1 and the secondary winding n2 are wound on the center column of the E-shaped magnetic core, and the inductance The winding n3 of L3 is wound on the leg on either side of the E-shaped magnetic core.

Beneficial effect:

The present invention aims at the shortcomings of the large magnetic parts of the existing single-stage boost inverter, and provides a single-stage boost inverter suitable for coupling inductance or tapped inductance. Transformers and inductors are designed as integrated magnetic parts, using EE magnetic core, EI magnetic core and UU magnetic core plus a common magnetic column. The converter can not only reduce the volume of magnetic parts, but also make leakage inductance easy control, increasing power density.

In addition to the advantages of the integrated magnetic parts of the EE magnetic core, the embodiment of the integrated magnetic part using the EI magnetic core can also reduce the copper loss of the winding to a certain extent.

The UU magnetic core has a large window area, which is suitable for winding inductors with large inductance values; a common magnetic column is added in the middle of the UU magnetic core, and the position of the air gap determines that the loss of the leakage flux chain winding at the air gap is small.

Description of drawings

Figures 1 to 3 show several existing single-stage boost inverter schemes composed of coupled inductors or tapped inductors;

Fig. 4 is a schematic diagram of an embodiment of the present invention involving an integrated magnetic part using an EE magnetic core;

5 is a schematic diagram of an embodiment of an integrated magnetic part using an EI magnetic core according to the present invention;

Fig. 6 is a schematic diagram of an embodiment of an integrated magnetic part using a UU magnetic core plus a common magnetic column according to the present invention;

Figure 7 is an application topology diagram of integrated magnetic parts using EE cores;

Fig. 8 is a kind of application topological diagram of the integrated magnetic part that adopts EI magnetic core;

Figure 9 is an application topology diagram of integrated magnetic parts using UU magnetic cores and common magnetic columns;

Names of main symbols in the above drawings: U _i - DC power supply voltage; ub - bus voltage; T ₁ ~ T ₆ - power tube; C ₁ , C ₂ - _capacitor ; D ₁ ~ D ₃ , D - diode; 4- Primary winding n1; 5-secondary winding n2; L ₃ -inductance; 6-winding n3 of inductance L3;

1-DC power supply, 2-single-stage boost network composed of coupled inductors or tapped inductors, 3-inverter bridge, 7-integrated magnetic parts.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in more detail:

The present invention is a single-stage boost inverter using a magnetic integrated transformer, including a DC power supply 1, a single-stage boost network 2 and an inverter circuit 3, characterized in that: the DC power supply 1 includes a power supply and an inductor L3, The single-stage boost inverter adopts the integrated magnetic part 7 as a magnetic integrated transformer, and the magnetic integrated magnetic part 7 includes an oppositely arranged magnetic core, and the oppositely arranged magnetic core is respectively wound with a primary side winding n1 and a secondary side winding n1. The winding n2 and the winding n3 of the inductance L3, the input end of the primary winding n1 is connected to the primary circuit, the output end of the secondary winding n2 is connected to the secondary circuit; the winding n3 of the inductance L3 is connected to the positive pole of the power supply, and One end is connected to the single-stage boosting network 2; the primary winding n1 and the secondary winding n2 are composed of coupled inductors or tapped inductors; there are air gaps between the magnetic columns of the magnetic cores arranged oppositely.

The primary winding n1, the secondary winding n2, and the winding n3 of the inductor L3 are planar windings or wound windings.

The magnetic cores arranged oppositely are one pair or two pairs connected in parallel.

As a preferred design, the oppositely arranged magnetic cores are oppositely arranged EE magnetic cores, the primary winding n1 and the secondary winding n2 are respectively wound on the two central columns of the EE magnetic core, and the winding n3 of the inductance L3 is wound on the magnetic core on the side posts on either side.

As a preferred design, it also includes an I-shaped magnetic core, the oppositely arranged magnetic core is a UU magnetic core with opposite openings, the I-shaped magnetic core is arranged in the middle of the UU magnetic core, and the primary winding n1 and the secondary winding n2 are wound On the same U-shaped magnetic core, the winding n3 of the inductor L3 is wound on another U-shaped magnetic core.

As a preferred design, the pair of magnetic cores provided is an EI magnetic core, and the E-shaped magnetic core is arranged towards the I-shaped magnetic core. The primary winding n1 and the secondary winding n2 are wound on the center column of the E-shaped magnetic core, and the inductance The winding n3 of L3 is wound on the leg on either side of the E-shaped magnetic core.

The interlinked magnetic flux between the primary and secondary windings and the winding of the inductor L3 cancels on the common magnetic column, so that the volume of the common magnetic column can be reduced.

The circuit structure and working principle of the present invention will be described below in conjunction with the accompanying drawings.

Figures 1 to 3 are circuit diagrams before integration of several single-stage boost inverters composed of coupled inductors or tapped inductors. The integrated transformer of the present invention is a primary side winding and a secondary side composed of coupled inductors or tapped inductors. The winding and the winding of the inductor L3 are replaced with integrated magnetic parts.

Integrated Magnetic Parts Example 1

The schematic diagram of the implementation of the integrated magnetic parts using the oppositely arranged EE magnetic core, as shown in Figure 4, the primary winding n1 and the secondary winding n2 of the coupled inductor or tapped inductor are wound on the center column, and the winding n3 of the inductor L3 is wound on any on one side of the side post.

Integrated Magnetic Parts Example 2

A schematic diagram of the implementation of the integrated magnetic parts using a pair of EI magnetic cores, as shown in Figure 5, the primary winding n1 and the secondary winding n2 of the coupled inductor or tapped inductor are wound on the center column, and the winding n3 of the inductor L3 is wound on either on the side pillars. In addition to the advantages shown in Figure 6, the use of this magnetic core and winding method can reduce the copper loss of the winding to a certain extent.

Integrated magnetics example three

A schematic diagram of the implementation of an integrated magnetic component using a pair of UU magnetic cores set opposite to each other and a common magnetic column. As shown in Figure 6, the primary winding n1 and the secondary winding n2 are wound on a U-shaped magnetic core, and the inductance L3 The winding n3 is wound on another secondary U-shaped magnetic core, the openings of the two secondary magnetic cores are placed opposite each other, and an I-shaped magnetic core is inserted between them as a common magnetic column. The common magnetic cylinder itself has no air gap.

Referring to accompanying drawing 7, it is the single-stage step-up inverter using the integrated magnetic transformer of Fig. 2 that adopts the integrated magnetic parts of Fig. 4 . Among them, the winding n3 of the inductor L3 is connected to the positive pole of the power supply, and the other end is connected to the anode of the diode D and one end of the second capacitor C2, and the cathode of the diode D is connected to the end of the same name of the secondary winding n2 of the autotransformer. , The secondary winding (n1, n2) is connected in series in the forward direction, the opposite end of the primary winding n1 is connected to the other end of the second capacitor C2 and the positive pole of the bus bar, and the autotransformer uses a tapped inductor, and the tap is connected to the first capacitor C1 One end, the other end of the first capacitor C1 is connected to the power supply and the negative pole of the bus bar. The primary winding n1 and the secondary winding n2 of the autotransformer in the integrated magnetic part 7 are respectively wound on the middle column of the EE magnetic core, the winding n3 of the inductance L3 is wound on the side column on either side, the primary winding n1, the secondary The interlinked magnetic flux of side winding n2 and winding n3 cancels on the other side column.

Embodiment 2 of the present invention, referring to accompanying drawing 8, is a schematic diagram of applying the integrated magnetic parts of Fig. 5 to the single-stage boost inverter shown in Fig. The integrated magnetic parts of 6 are applied to the schematic diagram of the single-stage boost inverter in Fig. 2 .

The present invention is not limited to the specific embodiments described above. Those skilled in the art can adopt various other embodiments according to the content disclosed in the present invention, for example, adopt different types of magnetic cores or materials, or combine the integrated magnetic core of the present invention The method is used for single-stage boost inverters composed of other coupled inductors or tapped inductors. Therefore, any design with some simple changes or changes based on the technical idea of the present invention falls within the protection scope of the present invention.

Claims (6)

1. one kind adopts the single-stage boost inverter of magnetic integrated transformer, comprise DC power supply (1), single-stage boost network (2) and inverter circuit (3), it is characterized in that: described DC power supply (1) comprises power supply and inductance L 3, described single-stage boost inverter adopts integrated magnetics (7) as magnetic integrated transformer, described magnetic integrated magnetics (7) comprises the magnetic core be oppositely arranged, this magnetic core be oppositely arranged is wound with respectively the winding (n3) of former limit winding (n1) and vice-side winding (n2) and inductance L 3, the input termination former limit circuit of described former limit winding (n1), vice-side winding (n2) output access secondary circuit, the winding (n3) of described inductance L 3 is connected on the positive pole of power supply, and the other end connects single-stage boost network (2), described former limit winding (n1) and vice-side winding (n2) are made up of coupling inductance or tap inductor, the each magnetic intercolumniation of the described magnetic core be oppositely arranged has air gap.

2. a kind of single-stage boost inverter adopting magnetic integrated transformer according to claim 1, is characterized in that: the winding (n3) of described former limit winding (n1), vice-side winding (n2) and inductance L 3 adopts plane winding or takeup type winding.

3. a kind of single-stage boost inverter adopting magnetic integrated transformer according to claim 1, is characterized in that: described in the magnetic core that is oppositely arranged be one secondary or two secondary in parallel.

4. the single-stage boost inverter of any one employing magnetic integrated transformer according to claims 1 to 3, it is characterized in that: described in the magnetic core that is oppositely arranged be the EE magnetic core be oppositely arranged, former limit winding (n1) and vice-side winding (n2) are respectively around on two center pillars of EE magnetic core, and the winding (n3) of inductance L 3 is around on the side column of magnetic core either side.

5. the single-stage boost inverter of any one employing magnetic integrated transformer according to claims 1 to 3, it is characterized in that: also comprise an I type magnetic core, the described magnetic core be oppositely arranged is the UU magnetic core that opening is relative, I type magnetic core is arranged on the centre position of UU magnetic core, former limit winding (n1) and vice-side winding (n2) are around on same U-shaped magnetic core, and the winding (n3) of inductance L 3 is around on another U-shaped magnetic core.

6. the single-stage boost inverter of any one employing magnetic integrated transformer according to claims 1 to 3, it is characterized in that: the described magnetic core to arranging is EI magnetic core, E-type magnetic core is arranged towards I type magnetic core, described former limit winding (n1) and vice-side winding (n2) are around on the center pillar of E-type magnetic core, and the winding (n3) of inductance L 3 is around on the side column of E-type magnetic core either side.