Phase-shifting rectifier transformer for charging pile

Abstract

The utility model provides a phase-shifting rectifier transformer for a charging pile. The phase-shifting rectifier transformer comprises a base, a frame, a plurality of groups of high-voltage coils, a plurality of groups of low-voltage coils and an iron core, the framework is fixed on the base, the plurality of groups of high-voltage coils are fixed in the framework, the iron cores are respectively arranged on the inner peripheral sides of the plurality of groups of high-voltage coils, and the plurality of groups of low-voltage coils are respectively sleeved on the outer peripheral sides of the plurality of groups of high-voltage coils; each group of low-voltage coils is of a six-split structure which is axially staggered, and the six-split structures are connected in series through leads to form a phase-shifting winding. According to the phase-shifting rectifier transformer for the charging pile, the impedance of each phase-shifting winding is balanced in a low-voltage coil phase-shifting winding arrangement mode, the operation harmonic wave of the transformer is reduced, meanwhile, the winding mode is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a phase-shifting rectifier transformer for a charging pile. Background Art

[0002] A charging pile is a charging device that provides energy for electric vehicles. Its operating principle is to convert external power into the voltage and current required by electric vehicles for charging. The charging pile is equipped with a transformer to achieve voltage and current conversion. The transformer has a high-voltage winding and a low-voltage winding composed of multiple coils, and an airway is provided between the high-voltage winding and the low-voltage winding. The high-voltage winding absorbs electrical energy from the power supply, and the low-voltage winding outputs voltage and current to the electric vehicle.

[0003] Traditional multi-winding charging pile transformers use high-voltage strength turn-insulated wires to wind low-voltage coils. Multiple windings are wound simultaneously, and the windings are connected in parallel in the form of radial splitting. Multiple transpositions must be performed during the winding process to balance the impedance of each winding.

[0004] However, the above-mentioned low-voltage coil windings cannot be made into a phase-shifted form, the transformer harmonics are large, the heat is large, affecting the normal operation of the transformer and the harmonics of the power grid; at the same time, the low-voltage coil windings must use high-voltage strength turn-insulated wires, which are expensive, and the wire insulation is easily damaged during the winding process, posing an operational safety risk; the wires of multiple windings of the low-voltage coil are wound at the same time, the leakage current is large, affecting the normal operation of the rear-end charging pile rectifier circuit. The low-voltage coil needs to be transposed multiple times during winding, the production process is difficult, and it takes a lot of work time. Utility Model Content

[0005] The utility model provides a phase-shifting rectifier transformer for a charging pile, aiming to solve the problems of low safety, great production process difficulty and time-consuming production of the existing transformer for the charging pile.

[0006] The utility model embodiment provides a phase-shifting rectifier transformer for a charging pile, comprising: a base, a frame, multiple groups of high-voltage coils, multiple groups of low-voltage coils and an iron core;

[0007] The frame is fixed on the base, the multiple groups of high-voltage coils are fixed in the frame, the iron cores are respectively arranged on the inner circumference of the multiple groups of high-voltage coils, and the multiple groups of low-voltage coils are respectively sleeved on the outer circumference of the multiple groups of high-voltage coils; each group of the low-voltage coils is a six-split structure arranged axially staggered, and the six-split structure is connected in series through leads to form a phase-shifting winding.

[0008] Preferably, the low-voltage coil is a 24-pulse coil with 4 phase-shift windings.

[0009] Preferably, the low-voltage coil is a 30-pulse coil with 5 phase-shift windings.

[0010] Preferably, the low-voltage coil is a 36-pulse coil with 6 phase-shift windings.

[0011] Preferably, the low-voltage coil is a 48-pulse coil with 8 phase-shift windings.

[0012] Preferably, the iron core includes an iron core body and a plurality of extension portions extending from a side of the iron core body close to the high-voltage coil; the iron core body is fixed to the frame, and the plurality of extension portions are respectively arranged on the inner circumference of the plurality of high-voltage coils.

[0013] Preferably, the iron core and the frame are fixedly connected by a plurality of bolts.

[0014] Preferably, the base comprises a first support plate and a second support plate which are arranged opposite to each other, and the frame is fixed to the first support plate and the second support plate respectively.

[0015] Preferably, the first support plate and the second support plate are both arranged in a U-shaped structure.

[0016] Preferably, the high-voltage coil is fixedly connected to the frame by a plurality of bolts.

[0017] Compared with the prior art, the utility model has the beneficial effect that, by fixing the frame on the base, the multiple groups of high-voltage coils are fixed in the frame, the iron cores are respectively arranged on the inner circumference of the multiple groups of high-voltage coils, and the multiple groups of low-voltage coils are respectively sleeved on the outer circumference of the multiple groups of high-voltage coils; each group of low-voltage coils is a six-split structure arranged axially staggered, and the six-split structure is connected in series through leads to form a phase-shifting winding. The impedance of each phase-shifting winding is balanced through the arrangement of the low-voltage coil phase-shifting winding, the transformer operating harmonics are reduced, and the winding method is simplified to reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is described in detail below in conjunction with the accompanying drawings. The above and other aspects of the utility model will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a phase-shifting rectifier transformer for a charging pile provided in an embodiment of the utility model;

[0020] Figure 2 It is a connection diagram of a phase-shifting rectifier transformer for a charging pile provided by an embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the axial arrangement of the low-voltage coils provided in an embodiment of the utility model.

[0022] In the figure, 1. base, 11. first support plate, 12. second support plate, 2. frame, 3. low-voltage coil, 4. high-voltage coil, 5. iron core, 51. iron core body, 52. extension part, 6. bolt. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] Combined with Figure 1-Figure 3 As shown, an embodiment of the utility model provides a phase-shifting rectifier transformer for a charging pile, comprising: a base 1, a frame 2, a plurality of groups of high-voltage coils 4, a plurality of groups of low-voltage coils 3 and an iron core 5.

[0025] The frame 2 is fixed on the base 1, the multiple groups of high-voltage coils 4 are fixed in the frame 2, the iron cores 5 are respectively arranged on the inner circumference of the multiple groups of high-voltage coils 4, and the multiple groups of low-voltage coils 3 are respectively sleeved on the outer circumference of the multiple groups of high-voltage coils 4; each group of the low-voltage coils 3 is a six-split structure arranged axially staggered, and the six-split structure is connected in series through leads to form a phase-shifting winding.

[0026] Each phase-shifting winding of the low-voltage coil 3 adopts a six-split structure, and the six split parts of each phase-shifting winding adopt an axially staggered arrangement structure, and then the six split parts are connected in series with leads on the outside to form a phase-shifting winding. Figure 3 The arrangement of the low-voltage coil 3 is illustrated by taking a 36-pulse coil with 6 phase-shift windings as an example.

[0027] Optionally, the multiple groups of high-voltage coils 4 are 3 groups, and the multiple groups of low-voltage coils 3 are 3 groups, and the two groups are arranged corresponding to each other.

[0028] Among them, the base 1 is used to support the fixed frame 2, and the high-voltage coil 4, the low-voltage coil 3 and the iron core 5 are fixedly installed through the frame 2, so that the iron core 5 is arranged in the high-voltage coil 4, and the low-voltage coil 3 is sleeved on the outer peripheral side of the high-voltage coil 4. The power is turned on through the low-voltage coil 3 and the high-voltage coil 4, and magnetic fields are generated between the high-voltage coil 4, the low-voltage coil 3 and the iron core 5 to realize the function of phase shift rectification, which is convenient for charging the charging pile and has high safety.

[0029] Specifically, multiple groups of high-voltage coils 4 are arranged side by side, and each group of low-voltage coils 3 is a six-split structure with axial staggered arrangement, and the six-split structure is connected in series through leads to form a phase-shifting winding; so that the relative position of each phase-shifting winding in the leakage magnetic field does not change much, the impedance is basically the same, and the mutual inductance between each phase-shifting winding is also close. At the same time, the winding method is relatively simple, which reduces the production cost.

[0030] In this embodiment, the low voltage coil 3 is a 24-pulse coil with four phase-shift windings.

[0031] The low voltage coil 3 may be a multi-pulse phase-shift winding.

[0032] In this embodiment, the low voltage coil 3 is a 30-pulse coil with 5 phase-shift windings.

[0033] In this embodiment, the low voltage coil 3 is a 36-pulse coil with 6 phase-shift windings.

[0034] In this embodiment, the low voltage coil 3 is a 48-pulse coil with 8 phase-shift windings.

[0035] Specifically, there are 24-pulse coils with 4 phase-shift windings (+30°, +15°, -15°, -30°), 30-pulse coils with 5 phase-shift windings (+24°, +12°, 0°, -12°, -24°), 36-pulse coils with 6 phase-shift windings (+25°, +15°, +5°, -5°, -15°, -25°), and 48-pulse coils with 8 phase-shift windings (+30°, +22.5°, +15°, +7.5°, -7.5°, -15°, -22.5°, -30°).

[0036] In this embodiment, the iron core 5 includes an iron core body 51 and a plurality of extensions 52 formed by extending from one side of the iron core body 51 close to the high-voltage coil 4; the iron core body 51 is fixed to the frame 2, and the plurality of extensions 52 are respectively arranged on the inner circumference of the plurality of high-voltage coils 4. The iron core body 51 is fixedly mounted on the frame 2, and the plurality of extensions 52 are connected to the iron core body 51, so that the iron core body 51 can suspend and support the plurality of extensions 52. The plurality of extensions 52 can be suspended in the plurality of high-voltage coils 4, and the charging effect of the transformer is achieved through the interaction between the high-voltage coil 4, the low-voltage coil 3 and the iron core 5.

[0037] In this embodiment, the iron core 5 is fixedly connected to the frame 2 by a plurality of bolts 6. The bolt 6 connection facilitates the disassembly, assembly and replacement of the iron core 5 and is convenient for maintenance.

[0038] In this embodiment, the base 1 includes a first support plate 11 and a second support plate 12 arranged opposite to each other, and the frame 2 is respectively fixed on the first support plate 11 and the second support plate 12. The frame 2 is supported and fixed by the first support plate 11 and the second support plate 12, so that the frame 2 has a good fixing effect. At the same time, it is on a horizontal plane, which facilitates the installation and fixation of the high-voltage coil 4 and the low-voltage coil 3.

[0039] In this embodiment, the first support plate 11 and the second support plate 12 are both arranged in a U-shaped structure. The U-shaped structure has high support strength and a wide range of applications.

[0040] In this embodiment, the high voltage coil 4 is fixedly connected to the frame 2 by a plurality of bolts 6. The bolt 6 connection facilitates the disassembly and replacement of the iron core 5 and is convenient for maintenance.

[0041] In this embodiment, the phase-shifting rectifier transformer also includes a shell (not marked in the figure), and the frame 2 is arranged in the shell to protect the high-voltage coil 4, the low-voltage coil 3 and the iron core 5 in the frame 2.

[0042] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of more restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, article or device including the element.

[0043] The embodiments of the present invention are described above in conjunction with the accompanying drawings. What is disclosed is only the preferred embodiments of the present invention. However, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms of equivalent changes without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A phase-shifting rectifier transformer for a charging pile, characterized in that: include: Base, frame, multiple sets of high voltage coils, multiple sets of low voltage coils and iron core; The frame is fixed on the base, the multiple groups of high-voltage coils are fixed in the frame, the iron cores are respectively arranged on the inner circumference of the multiple groups of high-voltage coils, and the multiple groups of low-voltage coils are respectively sleeved on the outer circumference of the multiple groups of high-voltage coils; each group of the low-voltage coils is a six-split structure arranged axially staggered, and the six-split structure is connected in series through leads to form a phase-shifting winding.

2. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The low voltage coil is a 24-pulse coil with four phase-shift windings.

3. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The low voltage coil is a 30-pulse coil with 5 phase-shift windings.

4. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The low-voltage coil is a 36-pulse coil with 6 phase-shift windings.

5. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The low-voltage coil is a 48-pulse coil with 8 phase-shift windings.

6. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The iron core includes an iron core body and a plurality of extension parts extending from one side of the iron core body close to the high-voltage coil; the iron core body is fixed to the frame, and the plurality of extension parts are respectively arranged on the inner circumference of the plurality of high-voltage coils.

7. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The iron core is fixedly connected to the frame by a plurality of bolts.

8. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The base includes a first support plate and a second support plate that are arranged opposite to each other, and the frame is fixed to the first support plate and the second support plate respectively.

9. The phase-shifting rectifier transformer for a charging pile according to claim 8, characterized in that: The first support plate and the second support plate are both arranged in a U-shaped structure.

10. The phase-shifting rectifier transformer for a charging pile according to claim 1, characterized in that: The high voltage coil is fixedly connected to the frame via a plurality of bolts.

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