magnetic collecting transformer

Abstract

The application provides a magnetic collection transformer, which comprises a transformer skeleton, four partitions are sequentially arranged on the transformer skeleton, three grooves are formed between the four partitions, and the three grooves are a first groove, a second groove and a third groove respectively; a first coil is wound on the first groove, and a second coil is wound on the third groove; the magnetic collection transformer further comprises a first magnetic core, a second magnetic core and a third magnetic core, wherein the first magnetic core is inserted into a first end of the transformer skeleton and wraps the first coil, the second magnetic core is inserted into a second end of the transformer skeleton and wraps the second coil, and the third magnetic core is arranged in the second groove. The magnetic collection transformer is conducive to realizing compact and small design of the circuit and meets the needs of small development of modern power electronic technology.

Description

Technical Field

[0001] This application relates to the field of non-isolated power supply technology, and in particular to a magnetically collecting transformer. Background Technology

[0002] Currently, the market demands increasingly higher power supplies. Existing power supply circuits typically require two or more transformers and associated circuitry to achieve functions such as improving power correction factor and chopping rectification. Therefore, power supply circuits with multiple transformers require a significant amount of space, which cannot meet the miniaturization requirements of modern power electronics technology. Utility Model Content

[0003] To address the aforementioned issues, this application provides a magnetically integrated transformer, which facilitates compact and miniaturized circuit design and meets the miniaturization needs of modern power electronics technology.

[0004] The magnetizing transformer includes a transformer frame with four partitions installed sequentially on it. Three grooves are formed between the four partitions, namely a first groove, a second groove, and a third groove. A first coil is wound in the first groove, and a second coil is wound in the third groove. The magnetizing transformer also includes a first magnetic core, a second magnetic core, and a third magnetic core. The first magnetic core is inserted into the first end of the transformer frame and wraps around the first coil. The second magnetic core is inserted into the second end of the transformer frame and wraps around the second coil. The third magnetic core is installed in the second groove.

[0005] As can be seen from the embodiments of this application, the magnetic components of two transformer circuits are integrated into the same transformer through the synergistic effect of the three-core split layout and the skeleton groove, which reduces the space occupied compared with the traditional discrete transformer scheme. At the same time, the relatively closed structure of the magnetizing transformer also reduces electromagnetic compatibility interference. Integrating the magnetic components of two transformer circuits into the same transformer also shortens the magnetic circuit length. The shorter path directly reduces the magnetic reluctance and excitation energy requirements, thereby reducing the heat generation of the magnetizing transformer.

[0006] In one possible embodiment, the first coil is a boost chopper coil and the second coil is a buck converter coil.

[0007] In one possible embodiment, a first coil is connected to a first circuit, which includes a diode D1, a switch K1, and a capacitor C1; a second coil is connected to a second circuit, which includes a diode D2, a switch K2, and a capacitor C2, wherein: a first port of the first coil is connected to the positive terminal of a power supply; a second port of the first coil is connected to the first port of the switch K1 and the first port of the diode D1; the second port of the switch K1 is connected to the negative terminal of a power supply; the second port of the diode D1 is connected to the first port of the capacitor C1 and the first port of the switch K2; the second port of the switch K2 is connected to the first port of the diode D2 and the first port of the second coil; the second port of the diode D2 is connected to the negative terminal of a power supply; and the second port of the second coil is connected to the load and the first port of the capacitor C2, and the second port of the capacitor C2 is connected to the negative terminal of a power supply.

[0008] As can be seen, in this embodiment, the boost chopper circuit and the buck converter circuit are integrated into a single magnetic component, achieving the integration and miniaturization of the transformer component while maintaining the topological independence of the two circuits.

[0009] In one possible embodiment, the length of the first coil is longer than the length of the second coil.

[0010] In one possible embodiment, the width of the first groove is greater than the width of the third groove.

[0011] As can be seen, in this embodiment, by configuring the first groove and the second groove with different slot widths, the first coil and the second coil corresponding to the boost chopper circuit and the buck converter circuit are adapted, thereby achieving the integration and miniaturization of the transformer components while maintaining the topological independence of the two circuits.

[0012] In one possible embodiment, the first and third magnetic cores are mounted coaxially in opposite directions, with opposite magnetic circuits.

[0013] As can be seen, in this embodiment of the application, by coaxially and in opposite directions installing the first and second magnetic cores with opposite magnetic circuits, the magnetic fields cancel each other out, thereby reducing leakage flux and eddy current losses, reducing electromagnetic interference caused by leakage flux, improving energy transmission efficiency, and improving power efficiency.

[0014] In one possible embodiment, the operating frequency of the magnetizing transformer is greater than 10 kHz.

[0015] As can be seen, in this embodiment of the application, by designing a transformer that supports higher frequencies, the magnetic transformer can operate at high magnetic flux density, thereby further reducing the size of the power supply.

[0016] In one possible embodiment, the first magnetic core, the second magnetic core, and the third magnetic core are made of ferrite material.

[0017] In one possible embodiment, the transformer frame is made of an insulating material.

[0018] As can be seen from the transformer in the above-described embodiments, the three-core split layout and the synergistic effect of the skeleton grooves integrate the magnetic components of two transformer circuits into a single transformer, reducing space occupation, electromagnetic compatibility interference, shortening the magnetic circuit length, and reducing the heat generation of the magnetizing transformer. The magnetizing transformer can integrate the boost chopper circuit and the buck converter circuit into a single magnetic component, achieving miniaturization and integration of transformer components while maintaining the topological independence of the two circuits. By configuring the first and second grooves with different slot widths, the first and second coils corresponding to the boost chopper circuit and the buck converter circuit can be adapted. By coaxially and in reverse, the first and second magnetic cores with opposite magnetic circuits cancel each other out, reducing leakage flux and eddy current losses, lowering electromagnetic interference caused by leakage flux, improving energy transmission efficiency, and increasing power supply efficiency. By designing a transformer that supports higher frequencies, the size of the power supply can be further reduced. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a magnetizing transformer provided in an embodiment of this application;

[0021] Figure 2 A schematic diagram illustrating the installation of a magnetic core and a transformer frame, provided for an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a magnetic core provided in an embodiment of this application;

[0023] Figure 4 A schematic diagram of the external connection of a magnetizing transformer provided in an embodiment of this application;

[0024] Figure 5 A schematic diagram of the current direction of a typical non-isolated lighting power supply provided in an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the current direction of a lighting power supply including a magnetizing transformer, provided for an embodiment of this application.

[0026] Reference numerals: 100: Magnetizing transformer; 101: Transformer frame; 102: Partition; 103: First coil; 104: Second coil; 105: First magnetic core; 106: Second magnetic core; 107: Third magnetic core. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0028] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps is not limited to the steps listed, but may optionally include steps not listed, or may optionally include other steps inherent to these processes, methods, products, or apparatuses.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] Example 1:

[0031] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a magnetizing transformer provided in an embodiment of this application, wherein the magnetizing transformer 100 includes a transformer frame 101 ( Figure 1 (Not shown in the image), four partitions 102 are sequentially installed on the transformer frame 101, forming three grooves between the four partitions. Figure 1 (not shown in the image), from Figure 1 The three grooves shown from left to right are the first groove, the second groove, and the third groove, respectively.

[0032] It should be noted that the first groove has a first coil 103 wound around it, the second groove has a third magnetic core 107 installed on it, and the third groove has a second coil 104 wound around it. Therefore, in Figure 1The three grooves cannot be directly observed from the viewpoint shown.

[0033] The magnetizing transformer also includes a first magnetic core 105, a second magnetic core 106, and a third magnetic core 107. The first magnetic core 105 is inserted into the first end of the transformer frame 101 and wraps around the first coil 103. The second magnetic core 106 is inserted into the second end of the transformer frame 101 and wraps around the second coil 104. The third magnetic core 107 is installed in the second groove.

[0034] It should be noted that the first coil 103 wound in the first groove and the first magnetic core 105 inserted into the first end of the transformer frame 101 constitute the first independent closed magnetic circuit, which is suitable for the first transformer circuit.

[0035] The second coil 104 wound in the third groove and the second magnetic core 106 inserted into the second end of the transformer frame 101 form another independent closed magnetic circuit, which is suitable for the second transformer circuit.

[0036] The third magnetic core 107 is centrally installed in the second groove, serving as a magnetic flux coupling bridge, so that the magnetic circuits of the first and second magnetic cores form a low magnetic resistance path in the second groove area.

[0037] Please see Figure 2 , Figure 2 This is a schematic diagram illustrating the installation of a magnetic core and a transformer frame, provided as an embodiment of this application. Figure 2 From the perspective shown, four partitions 102 are arranged on the transformer frame 101 from left to right, forming three grooves: the first groove, the second groove, and the third groove, from left to right. The first and third grooves are used for winding the coil, so their shapes are similar. The second groove is used for mounting the third magnetic core, so its shape is different from that of the first and third grooves.

[0038] Please see Figure 3 , Figure 3 This is a schematic diagram of a magnetic core structure provided in an embodiment of this application, wherein the first and second magnetic cores are E-type magnetic cores, and the third magnetic core is an I-type magnetic core. It can be seen that due to the structural differences between the first and third magnetic cores, the first and second magnetic cores are... Figure 2 The horizontal direction shown (i.e.) Figure 2 The first and second magnetic cores (as shown in the first and second magnetic core mounting directions) are inserted into the first and second ends of the transformer frame 101 to be mounted onto the transformer frame 101. The third magnetic core is mounted from the vertical direction (i.e., Figure 2 The third magnetic core (as shown in the mounting direction) is directly mounted onto the second groove of the transformer frame 101.

[0039] As can be seen from the embodiments of this application, the magnetic components of two transformer circuits are integrated into the same transformer through the synergistic effect of the three-core split layout and the skeleton groove, which reduces the space occupied compared with the traditional discrete transformer scheme. At the same time, the relatively closed structure of the magnetizing transformer also reduces electromagnetic compatibility interference. Integrating the magnetic components of two transformer circuits into the same transformer also shortens the magnetic circuit length. The shorter path directly reduces the magnetic reluctance and excitation energy requirements, thereby reducing the heat generation of the magnetizing transformer.

[0040] In one possible embodiment, the first and third magnetic cores are mounted coaxially in opposite directions, with opposite magnetic circuits.

[0041] Specifically, in the embodiments of this application, the first magnetic core and the second magnetic core are E-type magnetic cores.

[0042] The first and third magnetic cores are installed along the same axis but with opposite magnetic flux directions (for example, the magnetic flux direction of the first magnetic core is the X direction, and the magnetic flux direction of the third magnetic core is the opposite direction of X), so that the two form a closed magnetic circuit in the third magnetic core region of the second groove.

[0043] As can be seen, in this embodiment of the application, by coaxially and in opposite directions installing the first and second magnetic cores with opposite magnetic circuits, the magnetic fields cancel each other out, thereby reducing leakage flux and eddy current losses, reducing electromagnetic interference caused by leakage flux, improving energy transmission efficiency, and improving power efficiency.

[0044] In one possible embodiment, the operating frequency of the magnetizing transformer is greater than 10 kHz.

[0045] Specifically, in the embodiments of this application, the operating frequency of the magnetic transformer is greater than 10kHz, and more specifically, it is between 10kHz and 1MHz.

[0046] It should be noted that, according to Faraday's law of electromagnetic induction: V = N * A * dB / dt * 10^-8 (where V: voltage, N: number of turns, A: core cross-sectional area, dB / dt: rate of change of magnetic flux density). For a given voltage V and number of turns N, dB / dt must be large enough to induce a corresponding voltage.

[0047] At high frequencies (10kHz-1MHz), dB / dt can be very large, which means that the change in magnetic flux density ΔB in each switching cycle can be very large (ΔB=(V*T_on) / (N*A), where T_on is the on-time).

[0048] Therefore, even if the average or peak magnetic flux density is designed to be high, as long as the switching cycle is short (high frequency), the range of change of magnetic flux density ΔB within one cycle can meet the requirements of the induced voltage.

[0049] As can be seen, in this embodiment of the application, by designing a transformer that supports higher frequencies, the magnetic transformer can operate at high magnetic flux density, thereby further reducing the size of the power supply.

[0050] In one possible embodiment, the first magnetic core, the second magnetic core, and the third magnetic core are made of ferrite material.

[0051] The first, second, and third magnetic cores are specifically made of manganese-zinc ferrite material, etc.

[0052] In one possible embodiment, the transformer frame is made of an insulating material.

[0053] Specifically, the transformer frame (including partitions) is made of high-temperature engineering plastic material, such as liquid crystal polymer (LCP), polybutylene terephthalate, or polyphenylene sulfide (PPS).

[0054] Example 2:

[0055] The above embodiments provide a magnetic collector transformer that integrates two transformer circuit magnetic elements. Based on this, and on the premise of integrating the magnetic elements of the boost chopper circuit and the buck converter circuit, the embodiments of this application also provide another more detailed magnetic collector transformer.

[0056] In one possible embodiment, the first coil is a boost chopper coil and the second coil is a buck converter coil.

[0057] In this embodiment, the first coil serves as a magnetic element of the boost chopper coil, i.e., the BOOST circuit. The first coil is connected to the relevant components of the BOOST topology circuit. The voltage is boosted and the power correction factor is improved by the change in magnetic flux of the first magnetic core and the third magnetic core.

[0058] The second coil, as a magnetic element of the buck converter coil (i.e., the BUCK circuit), has its output connected to the relevant components of the BUCK topology circuit. The voltage reduction function is achieved through the change of magnetic flux of the second and third magnetic cores.

[0059] In one possible embodiment, a first coil is connected to a first circuit, which includes a diode D1, a switch K1, and a capacitor C1; a second coil is connected to a second circuit, which includes a diode D2, a switch K2, and a capacitor C2, wherein: a first port of the first coil is connected to the positive terminal of a power supply; a second port of the first coil is connected to the first port of the switch K1 and the first port of the diode D1; the second port of the switch K1 is connected to the negative terminal of a power supply; the second port of the diode D1 is connected to the first port of the capacitor C1 and the first port of the switch K2; the second port of the switch K2 is connected to the first port of the diode D2 and the first port of the second coil; the second port of the diode D2 is connected to the negative terminal of a power supply; and the second port of the second coil is connected to the load and the first port of the capacitor C2, and the second port of the capacitor C2 is connected to the negative terminal of a power supply.

[0060] Specifically, please see Figure 4 , Figure 4 This is a schematic diagram of the external connection of a magnetizing transformer provided in an embodiment of this application. The first port of the first coil is connected to the positive terminal of the power supply. The second port of the first coil is connected to the first port of switch K1 and the first port of diode D1. The second port of switch K1 is connected to the negative terminal of the power supply. The second port of diode D1 is connected to the first port of capacitor C1 and the first port of switch K2. The second port of switch K2 is connected to the first port of diode D2 and the first port of the second coil. The second port of diode D2 is connected to the negative terminal of the power supply. The second port of the second coil is connected to the load and the first port of capacitor C2. The second port of capacitor C2 is connected to the negative terminal of the power supply.

[0061] exist Figure 4 In the connection circuit shown, the first coil and the first circuit form a boost chopper circuit: when the switch K1 is closed, the power supply stores energy in the first coil; when the switch K1 is open, the first coil releases energy to the capacitor C1 through the diode D1, thereby achieving boost output.

[0062] The second coil and the second circuit form a step-down converter circuit: the boost output of capacitor C1 is controlled by the switching transistor K2, and the power is supplied to the load through the second coil and diode D2. After filtering by capacitor C2, a stable output voltage is provided.

[0063] The switching transistor K1 here can be any component that can realize circuit switching, such as a PWM controlled switching circuit, a transistor, or a magnetic latching relay.

[0064] As can be seen, in this embodiment, the boost chopper circuit and the buck converter circuit are integrated into a single magnetic component, achieving the integration and miniaturization of the transformer component while maintaining the topological independence of the two circuits.

[0065] In one possible embodiment, the length of the first coil is longer than the length of the second coil.

[0066] In one possible embodiment, the width of the first groove is greater than the width of the third groove.

[0067] Specifically, in this embodiment, the BOOST circuit and BUCK circuit are matched by structural parameters.

[0068] The length of the first coil is, for example, 1.2 to 1.8 times longer than that of the second coil. This is because boost chopping requires a higher inductance to suppress input current ripple, and it also leads to differences in characteristics such as the coil radius and number of turns of the first and second coils, which will not be elaborated here.

[0069] Based on the length relationship between the first and second coils, the slot width of the first groove (in the direction of the long axis of the transformer frame) is different from that of the third groove. The slot width of the first groove is greater than that of the third groove to provide a larger cross-sectional area for the first magnetic core and match the high power requirements of the boost topology; the narrow slot width design of the third groove compresses the volume of the second magnetic core.

[0070] As can be seen, in this embodiment, by configuring the first groove and the second groove with different slot widths, the first coil and the second coil corresponding to the boost chopper circuit and the buck converter circuit are adapted, thereby achieving the integration and miniaturization of the transformer components while maintaining the topological independence of the two circuits.

[0071] The above description focuses on the magnetizing transformer and the first and second circuits. For other detailed descriptions of the magnetizing transformer's core, baffles, and other components, please refer to the relevant content in Embodiment 1, which will not be repeated here.

[0072] Example 3:

[0073] The above-described embodiments of the application describe different magnetizing transformers. In this embodiment, magnetizing transformers will be explained within the context of specific circuit relationships. Please refer to... Figure 5 , Figure 5 The schematic diagram of the current direction of a typical non-isolated lighting power supply provided in the embodiments of this application shows that in the existing typical non-isolated lighting power supply, the current of the power supply first passes through the BOOST transformer to achieve voltage boosting and improve the power correction factor, and then passes through the BUCK transformer to step down and rectify, thereby outputting a constant current to the lighting load.

[0074] Please see Figure 6 , Figure 6The schematic diagram of the current direction of a lighting power supply including a magnetizing transformer provided in this application embodiment shows that the current of the power supply in this application embodiment directly passes through the magnetizing transformer, and the magnetizing transformer realizes voltage boosting, power correction factor improvement and voltage reduction rectification, and directly outputs constant current to the lighting load.

[0075] For the specific structure of the magnetizing transformer mentioned above, please refer to any of the transformers shown in the above application embodiments; it will not be described again here.

[0076] As can be seen from the transformer in the above-described embodiments, the three-core split layout and the synergistic effect of the skeleton grooves integrate the magnetic components of two transformer circuits into a single transformer, reducing space occupation, electromagnetic compatibility interference, shortening the magnetic circuit length, and reducing the heat generation of the magnetizing transformer. The magnetizing transformer can integrate the boost chopper circuit and the buck converter circuit into a single magnetic component, achieving miniaturization and integration of transformer components while maintaining the topological independence of the two circuits. By configuring the first and second grooves with different slot widths, the first and second coils corresponding to the boost chopper circuit and the buck converter circuit can be adapted. By coaxially and in reverse, the first and second magnetic cores with opposite magnetic circuits cancel each other out, reducing leakage flux and eddy current losses, lowering electromagnetic interference caused by leakage flux, improving energy transmission efficiency, and increasing power supply efficiency. By designing a transformer that supports higher frequencies, the size of the power supply can be further reduced.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0078] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0079] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0080] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A magnetizing transformer, characterized in that, The magnetizing transformer includes a transformer frame on which four partitions are sequentially mounted, forming three grooves between the partitions: a first groove, a second groove, and a third groove. A first coil is wound in the first groove, and a second coil is wound in the third groove. The magnetizing transformer also includes a first magnetic core, a second magnetic core, and a third magnetic core, wherein: The first magnetic core is inserted into the first end of the transformer frame and wraps around the first coil; the second magnetic core is inserted into the second end of the transformer frame and wraps around the second coil; and the third magnetic core is installed in the second groove.

2. The magnetizing transformer according to claim 1, characterized in that, The first coil is a boost chopper coil, and the second coil is a buck converter coil.

3. The magnetizing transformer according to claim 2, characterized in that, The first coil is connected to a first circuit, which includes a diode D1, a switching transistor K1, and a capacitor C1; the second coil is connected to a second circuit, which includes a diode D2, a switching transistor K2, and a capacitor C2, wherein: The first port of the first coil is connected to the positive terminal of the power supply. The second port of the first coil is connected to the first port of the switching transistor K1 and the first port of the diode D1. The second port of the switching transistor K1 is connected to the negative terminal of the power supply. The second port of the diode D1 is connected to the first port of the capacitor C1 and the first port of the switching transistor K2. The second port of the switching transistor K2 is connected to the first port of the diode D2 and the first port of the second coil. The second port of the diode D2 is connected to the negative terminal of the power supply. The second port of the second coil is connected to the load and the first port of the capacitor C2. The second port of the capacitor C2 is connected to the negative terminal of the power supply.

4. The magnetizing transformer according to claim 3, characterized in that, The length of the first coil is longer than the length of the second coil.

5. The magnetizing transformer according to claim 4, characterized in that, The width of the first groove is greater than the width of the third groove.

6. The magnetizing transformer according to any one of claims 1-5, characterized in that, The first magnetic core and the third magnetic core are installed coaxially and in opposite directions, with opposite magnetic circuits.

7. The magnetizing transformer according to any one of claims 1-5, characterized in that, The operating frequency of the magnetizing transformer is greater than 10kHz.

8. The magnetizing transformer according to any one of claims 1-5, characterized in that, The first magnetic core, the second magnetic core, and the third magnetic core are made of ferrite material.

9. The magnetizing transformer according to any one of claims 1-5, characterized in that, The transformer frame is made of insulating material.

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