Bidirectional DCDC transformer of charging and discharging all-in-one machine

Abstract

The utility model provides a bidirectional DCDC transformer for a charging and discharging all-in-one machine, which comprises two groups of combined frameworks, supplementary frameworks are arranged on the same sides of the two combined frameworks, transformer group windings are arranged in the combined frameworks and the supplementary frameworks, and the two supplementary frameworks are connected in parallel; a plurality of opposite connecting plates are arranged in the single-group combined framework, transformer group winding wires are arranged in the opposite connecting plates in the same group and are connected in series, and the transformer group winding wires in the opposite connecting plates are communicated with the transformer group winding wires in the supplementary framework; two groups of transformer group windings in the two combined frameworks are mutually connected in parallel; according to the utility model, a two-path phase-shifted full-bridge interleaving parallel connection mode is adopted, a compact UU structure is selected, the size of the system is reduced, non-uniform load current caused by device deviation is reduced through phase-shifted modulation compensation, the output voltage is modulated and controlled by pulse frequency, the interleaving angle between the two paths of LLC resonant converters is dynamically adjusted according to the size of a phase-shifted angle, and the phase-shifted phase-shifted full-bridge resonant converter is realized. And the output current ripple is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted transformer equipment, in particular to a bidirectional DCDC transformer for an all-in-one charging and discharging machine. Background Art

[0002] The rapid development of electric vehicles has placed higher demands on charging facilities. Bidirectional DC / DC and AC / DC three-phase transformers play a key role in charging piles, enabling bidirectional energy flow between the grid and batteries. They require flexible energy management capabilities. Bidirectional transformers can achieve flexible scheduling and storage of power, improving the stability and efficiency of the grid. Three-phase AC power is converted to DC through a rectifier bridge and then converted back to three-phase AC through an inverter. The soft switching characteristics of the LLC resonant converter enable it to maintain good performance even at high switching frequencies, making it widely used in today's trend of high-frequency and miniaturized power supplies. However, due to the inherent characteristics of the LLC resonant converter, namely the sinusoidal variation of the transformer primary current and large output current ripple, it requires multiple output filter capacitors in parallel, which greatly limits the reduction of system size and the expansion of system applications.

[0003] To achieve the above objectives, the present invention provides a bidirectional DCDC transformer for an integrated charging and discharging machine, which can solve the problems raised in the above background technology. Utility Model Content

[0004] The utility model adopts the following technical solutions to achieve:

[0005] A bidirectional DC / DC transformer for an integrated charging and discharging device, comprising two combined structures, each of which is provided with a supplementary structure on the same side of the two combined structures, each of which is provided with a transformer winding inside the combined structure and the supplementary structure, and the two supplementary structures are connected in parallel;

[0006] A single group of the combined structure includes a plurality of oppositely connected plates, wherein transformer group windings are provided in the oppositely connected plates of the same group and are connected in series with each other, and the transformer group windings in the oppositely connected plates are connected with the transformer group windings in the supplementary structure;

[0007] The two sets of transformer windings in the two combined structures are connected in parallel with each other;

[0008] The ends of the transformer group windings are all connected with lead heads.

[0009] Preferably, the opposing connecting plates include two split-structured mounting frames, a winding core is provided inside the mounting frames, and the transformer group winding is coiled around the circumference of the winding core.

[0010] Preferably, adjustment holes and positioning piles are provided on opposite sides of the two mounting frames, and the plurality of adjustment holes on one side are slidably connected to the plurality of positioning piles on the other side in a one-to-one corresponding manner.

[0011] Preferably, the inner surface of the opposing connecting plate is in an arc shape, and the center of the arc surface is located on the central axis of the winding core.

[0012] Preferably, a ventilation disk is provided between the two groups of combined structures, and a plurality of narrow air ducts are provided inside the ventilation disk. A lateral air duct is provided on the side where the two combined structures are close to each other, and the lateral air duct is connected to the side of the narrow air duct.

[0013] Preferably, diagonal piles are provided on one side of the two opposing connecting plates close to each other, and a gap formed between the two diagonal piles is connected to the lateral air duct.

[0014] Preferably, the lateral air duct is gradually reduced in size from one side of the combined structure to the notch on one side of the narrow air duct;

[0015] A heat-conducting cover is provided on the outer circumference of the transformer group winding.

[0016] Preferably, a single group of the combined structures and one of the supplementary structures are arranged in a column, and outer protective shells are fixed to the bottoms of the two columns of the combined structures and the supplementary structures, and walls are provided around the outer protective shells for protection.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model adopts a two-way phase-shifted full-bridge staggered parallel connection mode and a compact UU structure to reduce the volume of the system. The phase-shifted modulation compensation reduces the load uneven current caused by device deviation. The output voltage is controlled by pulse frequency modulation. According to the size of the phase-shifted angle, the staggered angle between the two LLC resonant converters is dynamically adjusted to further reduce the output current ripple and expand the application of the system.

[0019] By using a series resonant inductor and setting up a dedicated horizontal transformer integrated design shell structure, the winding density is increased, the product volume and height are reduced, and the production cost is reduced while meeting the volume and height requirements, making the product more competitive in the market and thus bringing better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the double-row arrangement structure space of the utility model;

[0022] Figure 3This is a schematic diagram of the connection between the transformer group winding and the combined architecture structure of the present utility model;

[0023] Figure 4 This is a schematic structural diagram of the ventilation disc of the present invention after being sliced from the side at the center line;

[0024] Figure 5 This is a schematic diagram of the overall structure and separation structure of the opposing connecting plates of the present invention;

[0025] Figure 6 This is the principle diagram of the interleaved parallel phase-shifted full-bridge main circuit of the utility model.

[0026] In the figure: 1. Outer shell; 2. Combined structure; 3. Heat-conducting cover; 4. Ventilation plate; 5. Lead head; 6. Transformer group winding;

[0027] 21. Opposite connecting plate; 22. Winding core; 23. Supplementary structure; 24. Adjustment hole; 25. Positioning pile; 26. Diagonal pile; 27. Mounting frame;

[0028] 41. Narrow air duct; 42. Side air duct. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0030] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] The present invention will be described in further detail below with reference to the accompanying drawings.

[0033] The improved implementation of this utility model is as follows, please refer to the attached Figure 1-3 、 Figure 6 , including two sets of combined structures 2, the same side of the two combined structures 2 are provided with a supplementary structure 23, the combined structure 2 and the supplementary structure 23 are both provided with a transformer group winding 6, and the two supplementary structures 23 are connected in parallel;

[0034] A single group of the combined structure 2 includes a plurality of opposing connecting plates 21, and the opposing connecting plates 21 of the same group are provided with transformer group windings 6 connected in series with each other. The transformer group windings 6 in the opposing connecting plates 21 are connected to the transformer group windings 6 in the supplementary structure 23;

[0035] The two sets of transformer windings 6 inside the two combined structures 2 are connected in parallel with each other;

[0036] The ends of the transformer group windings 6 are connected to lead heads 5 .

[0037] Please refer to Figure 3 、 Figure 5 The opposing connecting plate 21 includes two split-structure mounting frames 27 , a winding core 22 is provided inside the mounting frame 27 , and the transformer group winding 6 is wound around the side of the winding core 22 .

[0038] Adjustment holes 24 and positioning piles 25 are provided on opposite sides of the two mounting frames 27. The plurality of adjustment holes 24 on one side are slidably connected to the plurality of positioning piles 25 on the other side in a one-to-one correspondence.

[0039] The inner surface of the opposing connecting plate 21 is arc-shaped, and the center of the arc surface is located on the central axis of the winding core 22;

[0040] refer to Figure 6 This invention studies an efficient and reliable bidirectional transformer structure, connects an X-resonant inductor in series, and uses a two-way phase-shifted full-bridge interleaved parallel AC / DC + DC / DC two-stage structure to achieve bidirectional power flow and ensure system stability and efficiency. The interleaved parallel technology reduces the system size and expands the system's application areas; by using two phase-shifted full-bridge interleaved parallel methods and selecting a compact UU structure,

[0041] The system volume is reduced, and the output voltage is controlled by pulse frequency modulation. The uneven load current caused by device deviation is compensated by phase-shift modulation. At the same time, the staggered angle between the two LLC resonant converters is dynamically adjusted according to the size of the phase-shift angle to further reduce the output current ripple. The application of the system is expanded; and the improved transformer equipment phase-shifted full-bridge staggered parallel converter has the following benefits: automatic current sharing and reduced output ripple: Through staggered parallel connection, automatic current sharing and reduced output ripple can be easily achieved. This structure allows the output current ripples to offset each other, so that under the same output ripple requirements, a smaller inductance value can be designed, improving the efficiency and reliability of the system.

[0042] Improved system reliability: Compared with traditional voltage-based single-loop closed-loop feedback control switching converters, the multi-loop feedback control structure of the peak current-controlled switching converter has a cycle-by-cycle current limiting protection function, which can achieve higher system reliability and better voltage regulation.

[0043] Expanded Rectification Capability: A control system based on slope compensation can effectively address the problem of unstable secondary circuit inductor current when the input control signal duty cycle exceeds 50%. This compensation method greatly expands the rectification capability of current-controlled phase-shifted full-bridge full-wave rectifier switching converters, enabling their application in electric vehicle charging units.

[0044] Achieving Soft Switching: A phase-shifted full-bridge converter achieves soft switching and increases output power by adjusting the phase relationship between the converters. While this structure makes soft switching easier in the leading leg, it imposes certain limitations on output power and the energy storage inductor connected in series at the leg midpoint. Soft switching in the lagging leg is more restrictive, primarily due to the conflict between the lagging switch's ZVS turn-on and duty cycle loss. A staggered parallel approach can address these issues, increase converter output power, and achieve soft switching across the full power range.

[0045] A specific implementation method of the heat dissipation method of the utility model is as follows: Please refer to Figure 2 、 Figure 3 A ventilation plate 4 is provided between the two groups of combined structures 2, and a plurality of narrow air ducts 41 are provided inside the ventilation plate 4. A lateral air duct 42 is provided on the side where the two combined structures 2 are close to each other, and the lateral air duct 42 is communicated with the side of the narrow air duct 41;

[0046] A diagonal pile 26 is provided on one side of the two opposing connecting plates 21 close to each other, and a gap formed between the two diagonal piles 26 is connected to the lateral air duct 42;

[0047] The lateral air duct 42 is gradually reduced from the slot on one side of the combined structure 2 to the slot on the side of the narrow air duct 41; the outer peripheral side of the transformer group winding 6 is provided with a heat-conducting cover 3;

[0048] The air inlet and outlet ends of the ventilation disk 4 are connected to the air pump, and a narrow tube suction effect can be formed by quickly ventilating the inside of the narrow air duct 41, thereby sucking in the air on both sides and using the flowing air to dissipate heat. At the same time, the use space of the cooling equipment is minimized to improve the applicability of the transformer equipment. In addition, the design of the disk with a smaller side of the lateral air duct 42 is combined with the arc-shaped side effect of the heat-conducting cover 3. The side of the heat-conducting cover 3 is close to the inner wall of the mounting frame 27, which is convenient for guiding the arc-shaped wind into the narrow air duct 41. The heat-conducting cover 3 can be made of metal material with high thermal conductivity, which can expand the cooling range of the narrow air duct 41 and quickly take away heat.

[0049] Please pay attention to Figure 1 、 Figure 2 A single group of the combined structure 2 and the supplementary structure 23 are arranged in a column shape, and an outer protective shell 1 is fixed to the bottom of the two columns of the combined structure 2 and the supplementary structure 23, and a wall is provided on the surrounding side of the outer protective shell 1 for protection.

[0050] The above description of the present invention is illustrative in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A bidirectional DC / DC transformer for an integrated charging and discharging device, characterized in that: The invention comprises two groups of combined structures (2), wherein a supplementary structure (23) is provided on the same side of the two combined structures (2), a transformer winding (6) is provided inside the combined structures (2) and the supplementary structures (23), and the two supplementary structures (23) are connected in parallel with each other; A single group of the combined structure (2) includes a plurality of opposing connection plates (21) therein, wherein the opposing connection plates (21) of the same group are provided with transformer group windings (6) which are connected in series with each other, and the transformer group windings (6) in the opposing connection plates (21) are connected to the transformer group windings (6) in the supplementary structure (23); The two sets of transformer windings (6) inside the two combined structures (2) are connected in parallel with each other; The ends of the transformer group windings (6) are all connected to lead heads (5).

2. The bidirectional DCDC transformer for a charging and discharging integrated device according to claim 1, characterized in that: The opposing connecting plate (21) comprises two split-structure mounting frames (27), a winding core (22) is provided inside the mounting frame (27), and the transformer group winding (6) is wound around the circumference of the winding core (22).

3. The bidirectional DCDC transformer for a charging and discharging integrated device according to claim 2, characterized in that: Adjustment holes (24) and positioning piles (25) are provided on opposite sides of the two mounting frames (27), and the plurality of adjustment holes (24) on one side and the plurality of positioning piles (25) on the other side are slidably connected in a one-to-one correspondence.

4. The bidirectional DCDC transformer for an integrated charging and discharging device according to claim 2, characterized in that: The inner surface of the opposing connecting plate (21) is in an arc shape, and the center of the arc surface is located on the central axis of the winding core (22).

5. The bidirectional DCDC transformer for a charging and discharging integrated device according to claim 1, characterized in that: A ventilation disk (4) is provided between the two groups of combined structures (2), and a plurality of narrow air ducts (41) are provided inside the ventilation disk (4). A lateral air duct (42) is provided on one side of the two combined structures (2) close to each other, and the lateral air duct (42) is communicated with the side of the narrow air duct (41).

6. The bidirectional DCDC transformer for a charging and discharging integrated device according to claim 5, characterized in that: A diagonal pile (26) is provided on one side of the two opposing connecting plates (21) close to each other, and a gap formed between the two diagonal piles (26) is connected to the lateral air duct (42).

7. The bidirectional DCDC transformer for an integrated charging and discharging device according to claim 6, characterized in that: The lateral air duct (42) gradually decreases in size from one side of the combined structure (2) to one side of the narrow air duct (41); A heat-conducting covering shell (3) is provided on the outer peripheral side of the transformer group winding (6).

8. The bidirectional DCDC transformer for an integrated charging and discharging device according to claim 1, characterized in that: A single group of the combined structures (2) and one of the supplementary structures (23) are arranged in a column shape, and outer protective shells (1) are fixed to the bottoms of the two columns of the combined structures (2) and the supplementary structures (23), and the outer protective shells (1) are provided with walls on the circumference for protection.

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