Inductance type voltage stabilizer integrated with compensation inductor and power supply module

Abstract

The invention relates to the technical field of power electronics, in particular to an inductance type voltage stabilizer integrated with a compensation inductor and a power module. A coupling inductor unit and the compensation inductor are integrated in a packaging shell, and the compensation inductor is connected between two adjacent phases of secondary winding inductors in series; the two ends of the compensation inductor can be arranged on different planes respectively, in connection of two adjacent phases of secondary winding inductors, the tail end of the previous phase of secondary winding inductor and one end of the corresponding compensation inductor are located on the same welding face, and the head end of the next phase of secondary winding inductor and the other end of the corresponding compensation inductor are located on the same welding face. The two ends of the compensation inductor and the two ends of the corresponding secondary winding inductor are guaranteed to be located on the same welding face, the problem of line connection is solved, external wiring is not needed, and therefore the structure of the inductance type voltage stabilizer is more concise.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and particularly to an inductive voltage regulator and a power supply module integrated with a compensation inductor. Background Art

[0002] The Trans-Inductor Voltage Regulator (TLVR) is mainly applied to multi-phase power supply schemes and can supply power to high-current and high-power density systems such as Graphic Processing Units (GPUs) and servers. When the system load makes a rapid large dynamic step, the changing energy can be coupled to the N-phase power supply through the inductive voltage regulator to optimize the power supply transient response.

[0003] As Figure 1 shown, in existing inductive voltage regulators, the main power loop inductors (i.e., L1 to LN) are used to couple the secondary winding inductors (i.e., L12 to LN2), and an additional compensation inductor Lc needs to be added outside the inductive voltage regulator to store and transfer energy during switch switching. However, the following problems exist in practical applications:

[0004] 1. The additional compensation inductor will occupy product space.

[0005] 2. In some application scenarios, the compensation inductor will withstand electrical stresses several times that of the input voltage, which poses challenges to the withstand voltage performance of the compensation inductor.

[0006] 3. When the two ends of the secondary winding inductor are not on the same Printed Circuit Board (PCB) trace plane, additional conductors are required to connect the heads and tails of two adjacent secondary winding inductors, which will increase the trace complexity.

[0007] To more clearly elaborate on the aforementioned problem 3, refer to Figure 2 , this inductive voltage regulator includes main power loop inductors (i.e., L1 and L2) and secondary winding inductors (i.e., L12 and L22). The main power loop inductor L1 is coupled with the secondary winding inductor L12, and the main power loop inductor L2 is coupled with the secondary winding inductor L22. The head end of the secondary winding inductor L12 needs to lead out a wire to connect to the compensation inductor. At the same time, the tail end of the secondary winding inductor L12 needs to be connected to the head end of the secondary winding inductor L22. However, the tail end of the secondary winding inductor L12 and the head end of the secondary winding inductor L22 are not on the same circuit board welding surface, and additional traces need to be added on the upper and lower two circuit boards respectively, and then external connection wires are used to connect the traces on the two circuit boards to achieve their connection (i.e., Figure 2 the path L in), increasing the trace complexity.

[0008] In view of this, overcoming the defects existing in the prior art is an urgent problem to be solved in the technical field. Summary of the Invention

[0009] The technical problem to be solved by the present invention is how to solve the problems that the two ends of the secondary coupling winding in the prior art are not in the same PCB trace plane, and additional conductors are required to connect the head and tail of the secondary coupling winding, thereby increasing the trace complexity, and the problem that the electrical stress borne by the compensation inductor is too large.

[0010] The present invention adopts the following technical solutions:

[0011] In a first aspect, an inductive voltage regulator integrating a compensation inductor is provided, including a package housing, a first circuit board, a second circuit board, and an integrated inductor unit disposed between the first circuit board and the second circuit board, and the first circuit board and the second circuit board are respectively disposed on both sides of the package housing;

[0012] The integrated inductor unit includes a plurality of coupled inductor units and at least one compensation inductor, and at least one compensation inductor is disposed between two adjacent coupled inductor units; the coupled inductor unit includes a main circuit inductor and a secondary winding inductor, and the secondary winding inductor is coupled with the main circuit inductor;

[0013] One end of the main circuit inductor is used to connect to an input voltage, and the other end of the main circuit inductor is used to connect to a power-consuming end;

[0014] One end of the compensation inductor is connected to the secondary winding inductor of the previous phase; the other end of the compensation inductor is connected to the secondary winding inductor of the next phase.

[0015] Preferably, at least a first solder joint, a second solder joint, and a third solder joint are disposed on the first circuit board; at least a fourth solder joint, a fifth solder joint, and a sixth solder joint are disposed on the second circuit board;

[0016] The second solder joint and the third solder joint are connected through an internal wire in the first circuit board; the fourth solder joint and the fifth solder joint are connected through an internal wire in the second circuit board;

[0017] One end of the secondary winding inductor of the previous phase is connected to the first solder joint, and the other end of the secondary winding inductor of the previous phase is connected to the fourth solder joint; one end of the compensation inductor is connected to the fifth solder joint, the other end of the compensation inductor is connected to the second solder joint, one end of the secondary winding inductor of the next phase is connected to the third solder joint, and the other end of the secondary winding inductor of the next phase is connected to the sixth solder joint.

[0018] Preferably, an insulating cavity is provided on one side of the encapsulation housing, the compensation inductor is disposed in the insulating cavity, and both ends of the compensation inductor are exposed from the insulating cavity.

[0019] Preferably, at least a first conductive member and a second conductive member are provided in the inner cavity of the encapsulation housing;

[0020] The other end of the inductance of the previous-phase secondary winding is connected to one end of the first conductive member, and the other end of the first conductive member is connected to one end of the compensation inductor; the other end of the compensation inductor is connected to one end of the second conductive member, and the other end of the second conductive member is connected to one end of the inductance of the subsequent-phase secondary winding.

[0021] Preferably, an inductance fitting conductor is provided in the inner cavity of the encapsulation housing, and the compensation inductor is integrated in the inductance fitting conductor;

[0022] The other end of the inductance of the previous-phase secondary winding is connected to one end of the inductance fitting conductor; the other end of the inductance fitting conductor is connected to one end of the inductance of the subsequent-phase secondary winding.

[0023] Preferably, a plurality of switch units are further included, each of the coupling inductance units is correspondingly connected to a switch unit, the switch unit includes a first switching tube and a second switching tube, and both the first switching tube and the second switching tube are disposed on the first circuit board;

[0024] One end of the first switching tube is used for connecting to an input voltage, the other end of the first switching tube is respectively connected to one end of the second switching tube and one end of the main circuit inductor, and the other end of the second switching tube is grounded.

[0025] Preferably, an input filter unit and an output filter unit are further included, one end of the input filter unit is connected to the input voltage, and the other end of the input filter unit is grounded; one end of the output filter unit is connected to one end of the main circuit inductor, and the other end of the output filter unit is grounded.

[0026] Preferably, the coupling coefficient between the compensation inductor and two adjacent coupling inductance units is less than or equal to a preset value.

[0027] Preferably, the compensation inductor forms a preset angle with the second circuit board.

[0028] In a second aspect, a power module is provided, including at least one inductive voltage regulator integrating a compensation inductor as described in the first aspect.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] In the present invention, the coupled inductor unit and the compensation inductor are both integrated inside the package housing. The compensation inductor is connected in series between the inductors of two adjacent secondary windings. The two ends of the compensation inductor can be respectively arranged on different planes. In the connection of two adjacent secondary winding inductors, the tail end of the secondary winding inductor of the previous phase and one end of the corresponding compensation inductor are on the same welding surface, and the head end of the secondary winding inductor of the latter phase and the other end of the corresponding compensation inductor are on the same welding surface, that is, it is ensured that the two ends of the compensation inductor and the two ends of the corresponding secondary winding inductor are on the same welding surface, solving the problem of circuit connection and eliminating the need for external wiring, thereby making the structure of the inductive voltage regulator more concise.

[0031] On the other hand, in the present invention, the large voltage borne by the original independent compensation inductor is evenly distributed on multiple compensation inductors, and the voltage value borne by each compensation inductor is greatly reduced, ensuring the stability of the inductive voltage regulator. Brief Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 is a schematic circuit structure diagram of an existing inductive voltage regulator provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic internal structure diagram of an existing inductive voltage regulator provided by an embodiment of the present invention;

[0035] Figure 3 is a schematic external structure diagram of an inductive voltage regulator with an integrated compensation inductor provided by an embodiment of the present invention;

[0036] Figure 4 is a schematic internal structure diagram of an inductive voltage regulator with an integrated compensation inductor provided by an embodiment of the present invention;

[0037] Figure 5 is a schematic circuit structure diagram of an inductive voltage regulator with an integrated compensation inductor provided by an embodiment of the present invention;

[0038] Figure 6 is a schematic structure diagram of the first connection scheme provided by an embodiment of the present invention;

[0039] Figure 7 is another schematic structure diagram of the first connection scheme provided by an embodiment of the present invention;

[0040] Figure 8It is a schematic structural diagram of a multi-phase coupled inductor unit provided by an embodiment of the present invention;

[0041] Figure 9 It is another schematic diagram of the structure of the multi-phase coupled inductor unit provided by an embodiment of the present invention;

[0042] Figure 10 It is a schematic structural diagram of the second connection scheme provided by an embodiment of the present invention;

[0043] Figure 11 It is a schematic structural diagram of the third connection scheme provided by an embodiment of the present invention;

[0044] Figure 12 It is another schematic structural diagram of the third connection scheme provided by an embodiment of the present invention;

[0045] Figure 13 It is a schematic structural diagram of the fourth connection scheme provided by an embodiment of the present invention;

[0046] Figure 14 It is another schematic structural diagram of the fourth connection scheme provided by an embodiment of the present invention;

[0047] Figure 15 It is a schematic structural diagram of a switch unit provided by an embodiment of the present invention;

[0048] Figure 16 It is a schematic circuit diagram of a switch unit provided by an embodiment of the present invention;

[0049] Figure 17 It is another schematic structural diagram of the inductive voltage regulator provided by an embodiment of the present invention. Detailed implementation manners

[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, i.e., "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples", etc. are intended to indicate that the specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they are carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, they are not limited to being carried by one embodiment or example in a combined manner.

[0052] In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, for example, in the description, for the same type of nouns, the method of adding "A" and "B" at the end is used to describe them as two independent individuals. In this case, the features defined with "A" and "B" are only used for the purpose of distinguishing similar individuals and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0053] When describing some embodiments, the expressions "coupled", "coupled to", and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components have direct physical contact or electrical contact with each other. Another example is that when describing some embodiments, the term "coupled" may be used to indicate that two or more components have direct physical contact or electrical contact. However, the term "connected" or "coupled" may also mean that two or more components do not have direct contact with each other but still cooperate or interact with each other, such as "optical path coupling" and "wireless connection", etc. The embodiments disclosed herein are not necessarily limited to the content of the present invention.

[0054] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0055] Embodiment 1:

[0056] In the existing inductive voltage regulator, taking two phases as an example, as Figure 2As shown, when the secondary winding inductors in each phase-coupled inductor unit are connected in series, the two ends to be connected (i.e., the A end and the B end) are respectively on different soldering surfaces. It is necessary to add traces on the upper and lower circuit boards respectively, and then use an external connection wire to connect the traces on the two circuit boards to achieve their connection (i.e., Figure 2 the path L in

[0057] ), which increases the trace complexity and the need for additional traces, greatly increasing the complexity of the circuit design. Moreover, more traces mean more solder joints, which undoubtedly increases the error probability during the production process and the difficulty of production cost and quality control.

[0058] In one embodiment, as Figure 4 shown, the integrated inductor unit may include a two-phase coupled inductor unit.

[0059] In one embodiment, as Figure 5 shown, the integrated inductor unit may include an N-phase coupled inductor unit, and at least one compensation inductor is provided between every two adjacent coupled inductor units (i.e., there are a total of N - 1 compensation inductors).

[0060] To facilitate the introduction of the inductive voltage regulator, taking Figure 3 and Figure 4 as examples to illustrate the structure of the inductive voltage regulator, the inductive voltage regulator includes a package housing, a first circuit board, a second circuit board, and an integrated inductor unit disposed between the first circuit board and the second circuit board. The first circuit board and the second circuit board are respectively disposed on both sides of the package housing; the integrated inductor units each include a plurality of coupled inductor units and at least one compensation inductor, and at least one compensation inductor is provided between every two adjacent coupled inductor units (i.e., Figure 4 Lc1 in ), the coupled inductor unit includes a main circuit inductor (including L1, L2, etc.) and a secondary winding inductor (including L12, L22, etc.), the secondary winding inductor is coupled with the main circuit inductor, one end of the main circuit inductor is used to connect to the input voltage, and the other end of the main circuit inductor is used to connect to the power-consuming end.

[0061] One end of the compensation inductor is connected to the secondary winding inductor of the previous phase; the other end of the compensation inductor is connected to the secondary winding inductor of the next phase, where both ends of the compensation inductor and both ends of the corresponding secondary winding inductor are on the same welding surface.

[0062] It should be noted here that the previous phase and the next phase are relative concepts. The secondary winding inductor of the previous phase and the secondary winding inductor of the next phase refer to the secondary winding inductors corresponding to two adjacent coupled inductor units respectively.

[0063] It should be noted here that one end of the secondary winding inductor located at the head end is grounded, and the other end is connected to the compensation inductor or directly connected to the secondary winding inductor of the next phase; one end of the secondary winding inductor located at the tail end is connected to the compensation inductor or directly connected to the secondary winding inductor of the previous phase, and the other end of the secondary winding inductor located at the tail end is grounded. There are at least the following two connection relationships for the secondary winding inductors other than the secondary winding inductors at the head end and the tail end: the secondary winding inductor of the previous phase and the secondary winding inductor of the next phase are connected through the compensation inductor, or the secondary winding inductor of the previous phase and the secondary winding inductor of the next phase are connected together through other conductive parts.

[0064] Among them, the packaging shell serves as the physical protection barrier of the entire module. Mechanically, it can resist external physical impacts such as collisions and vibrations, and protect the internal precision electronic components from damage. From an electrical perspective, the packaging shell provides good insulation performance, avoids electromagnetic interference from the external environment, and ensures the safe and stable operation of the inductor module in different electrical environments.

[0065] In one embodiment, the first circuit board is disposed on the top of the packaging shell, and the second circuit board is disposed on the bottom of the packaging shell. Both are manufactured using PCB technology. The circuit board is integrated with interfaces for connecting to external circuits, such as pins, sockets, etc., for realizing data interaction and power transmission between the module and other circuit systems. More specific details are not elaborated in this embodiment.

[0066] Taking the series connection of the secondary winding inductor in the first-phase coupled inductor unit and the secondary winding inductor in the second-phase coupled inductor unit as an example, the bottom of the secondary winding inductor in the first-phase coupled inductor unit needs to be connected to the top of the secondary winding inductor in the second-phase coupled inductor unit. In the prior art, additional wires are required to achieve the connection of both ends.

[0067] In one embodiment, a compensation inductor is integrated inside the package housing. The series connection of the two secondary winding inductors is achieved through the compensation inductor. The compensation inductor is directly connected to the second circuit board, and then is connected in series with the secondary winding inductor of the adjacent coupled inductor unit through the vertical interconnection (such as metal posts or buried wires) of the first circuit board. There is no need for external interlayer routing throughout the process. The compensation inductor is embedded between adjacent coupled inductor units and is connected through a short path, reducing unnecessary external routing.

[0068] For the compensation inductor, at the circuit principle level, when the load current increases instantaneously, the duty cycle of pulse width modulation (PWM) of a certain phase of the multi-phase power supply increases, causing the current flowing through the compensation inductor to increase. Since the secondary winding inductors of all phases are connected in series with the compensation inductor, the current change of the compensation inductor will be coupled to the remaining coupled inductor units of all phases, increasing the current of each phase. Similarly, when the load current decreases instantaneously, the decreasing current of the compensation inductor will be coupled to the remaining coupled inductor units of all phases, which is equivalent to all phases jointly responding to the change of the transient current, and the output total current can also quickly reach the current required by the load, effectively improving the transient response of the multi-phase power supply.

[0069] To further illustrate the above embodiment, this embodiment proposes multiple solutions to make the two ends of the compensation inductor and the two ends of the corresponding secondary winding inductor be on the same welding surface.

[0070] In one embodiment, as Figure 6 and Figure 7 shown, the first solution includes: at least a first solder joint (a in the figure), a second solder joint (b in the figure), and a third solder joint (c in the figure) are provided on the first circuit board; at least a fourth solder joint (not shown in the figure), a fifth solder joint (d in the figure), and a sixth solder joint (not shown in the figure) are provided on the second circuit board; wherein, the second solder joint and the third solder joint are connected through an internal wire (i.e., internal wire 1) in the first circuit board; the fourth solder joint and the fifth solder joint are connected through an internal wire (i.e., internal wire 2) in the second circuit board; one end of the secondary winding inductor of the previous phase is connected to the first solder joint, and the other end of the secondary winding inductor of the previous phase is connected to the fourth solder joint; one end of the compensation inductor is connected to the fifth solder joint, the other end of the compensation inductor is connected to the second solder joint, one end of the secondary winding inductor of the next phase is connected to the third solder joint, and the other end of the secondary winding inductor of the next phase is connected to the sixth solder joint.

[0071] Among them, the fourth solder joint is located on the second circuit board opposite to the first solder joint, and the sixth solder joint is located on the second circuit board opposite to the third solder joint. There are at least the following three cases for the connection relationship between the first solder joint and other devices: the first solder joint can be grounded, or the first solder joint is connected to the compensation inductor of the previous phase, or the first solder joint is connected to the secondary winding inductor of the previous phase. There are also at least the following three cases for the connection relationship between the sixth solder joint and other devices: the sixth solder joint can be grounded, or the sixth solder joint is connected to the compensation inductor of the previous phase, or the sixth solder joint is connected to the secondary winding inductor of the previous phase.

[0072] By reasonably designing the solder joints on the first circuit board and the second circuit board and the internal wire connection method, the two ends of the compensation inductor and the two ends of the corresponding secondary winding inductor can be on the same welding surface, thereby simplifying the welding process and reducing the complexity of the wire routing.

[0073] In the first circuit board, the second solder joint and the third solder joint are connected by internal wires. In the second circuit board, the fourth solder joint and the fifth solder joint are connected by internal wires.

[0074] In one embodiment, referring to Figure 7 , the coupling between the secondary winding inductor and the main circuit inductor is based on the principle of electromagnetic induction. The change in the current of the main circuit inductor will induce an electromotive force in the secondary winding inductor. One end of the secondary winding inductor can be connected to the first solder joint and grounded, which can provide a stable reference potential for the circuit and help stabilize the operation of the circuit. The other end of the secondary winding inductor is connected to the fourth solder joint, and through the fourth solder joint, connections are established with other circuits on the second circuit board. One end of the compensation inductor is connected to the fifth solder joint, and the other end is connected to the second solder joint. Since the second solder joint and the third solder joint are connected by internal wires inside the first circuit board, and the fifth solder joint and the fourth solder joint are connected by internal wires inside the second circuit board, the two ends of the compensation inductor are associated with the two ends of the corresponding secondary winding inductor and are on the same welding surface (achieved through solder joint connection). One end of the secondary winding inductor in adjacent coupled inductor units is connected to the third solder joint, connected to the second solder joint through internal wires inside the first circuit board, and then connected to one end of the compensation inductor, completing the series connection relationship between the secondary winding inductors in the entire circuit.

[0075] In one embodiment, as Figure 8 and Figure 9 shown, the integrated inductor unit includes a 6-phase coupled inductor unit and 5 compensation inductors. The secondary winding inductors in the 6-phase coupled inductor unit and the 5 compensation inductors are connected in series through the above scheme, and the details in this embodiment will not be elaborated further.

[0076] With the above structural design, during the welding operation, there is no longer a need to route additional wires externally as in the traditional method to connect the two ends of the two-phase secondary winding inductors on different planes. This greatly simplifies the welding process and improves production efficiency. At the same time, the external wiring is reduced, the electrical interference and fault risks that may be brought about by complex wiring are lowered, the stability and reliability of the entire inductor module are improved, and the space layout of the circuit board is optimized, making the module structure more compact.

[0077] In one embodiment, referring to Figure 7 , when the lengths of the secondary winding inductors (L12 and L22) are shorter than those of the main circuit inductors (L1 and L2), the internal wires 1 and 2 can also be directly placed inside the package housing. Under the condition of ensuring the same connection method and implementation principle as the first solution above, there is no need to integrate the internal wires 1 and 2 into the corresponding circuit board.

[0078] When designing an inductive voltage regulator with an integrated compensation inductor, it is necessary to reasonably adjust the distance between the compensation inductor and the adjacent coupled inductor units according to the specific circuit performance requirements to obtain an appropriate coupling coefficient, thereby optimizing the circuit performance. In one embodiment, the coupling coefficient between the compensation inductor and the adjacent two coupled inductor units is less than or equal to a preset value. Among them, the preset value can be 0.3.

[0079] Based on the first solution structure shown above such as Figure 6 and Figure 7 , if the influence of the coupling coefficient between the inductors is not considered, in one embodiment, as Figure 10 shown, the second solution includes: an insulating cavity can be provided on one side of the package housing, the compensation inductor is arranged in the insulating cavity, and both ends of the compensation inductor are exposed from the insulating cavity to be respectively connected to the solder joints on the circuit board. The insulating cavity is arranged on one side of the package housing but does not exceed the scope of the package housing, so that the compensation inductor has an independent magnetic core and winding and is in a relatively closed insulating cavity, which can avoid the influence brought about by the coupling coefficient between the compensation inductor and the adjacent coupled inductor units.

[0080] Similarly, in order to connect the two ends of the secondary winding inductors in the adjacent two-phase coupled inductor units without using additional external wires outside the inductor module, in addition to the solution of embedding internal wires in the first circuit board and the second circuit board, another structure is proposed in this embodiment. In one embodiment, as Figure 11As shown, the third solution includes: at least a first conductive member and a second conductive member are disposed in the inner cavity of the encapsulation housing; the other end of the inductance of the previous-phase secondary winding is connected to one end of the first conductive member, and the other end of the first conductive member is connected to one end of the compensation inductance; the other end of the compensation inductance is connected to one end of the second conductive member, and the other end of the second conductive member is connected to one end of the inductance of the subsequent-phase secondary winding.

[0081] Figure 11 Taking a two-phase coupled inductance unit as an example, the first conductive member and the second conductive member are usually made of materials with good electrical conductivity and certain rigidity, such as metal materials like copper and aluminum. Their shapes and sizes may be designed according to the internal space of the encapsulation housing and the requirements of circuit connection. Through the first conductive member and the second conductive member, a complete connection path is constructed inside the encapsulation housing, realizing the connection between the two ends of the inductance of the secondary winding in adjacent coupled inductance units without the need for additional external wires.

[0082] In one embodiment, in order to enable the above-mentioned third solution to meet the actual situation, that is, when the integrated inductance unit includes a multi-phase coupled inductance unit, it is necessary to ensure that the lengths of the inductances of the secondary windings in each phase of the coupled inductance unit and each compensation inductance are small enough (i.e., the proportion occupied in the vertical direction is small), so that all devices can be disposed in the encapsulation housing.

[0083] For example, if the lengths of the inductances of the secondary windings and each compensation inductance are the same, and the proportion of the length in the vertical direction to the length of the main circuit inductance is k for each. When including a two-phase coupled inductance unit, k = 1 / 3, as Figure 12 shown; when including a three-phase coupled inductance unit, k = 1 / 5; when including a four-phase coupled inductance unit, k = 1 / 7; and so on, to obtain the length of each inductance of the secondary winding and each compensation inductance. According to the above setting of the proportion k of the length of the inductance of the secondary winding and each compensation inductance in the vertical direction to the length of the main circuit inductance, it can be ensured that when the integrated inductance unit includes a multi-phase coupled inductance unit, all devices (including the inductances of the secondary windings and the compensation inductances) are disposed in the encapsulation housing, ensuring the integrity and wholeness of the structure of the inductive voltage regulator.

[0084] The specific value of k needs to be determined according to actual design requirements, the size limitations of the encapsulation housing, and circuit performance requirements, etc., and is not specifically limited in this embodiment. In one embodiment, in the third solution, it is also necessary to ensure that the coupling coefficient between the compensation inductance and the adjacent two coupled inductance units is less than or equal to a preset value. Among them, the preset value can be 0.3.

[0085] Similarly, in order to connect the two ends of the secondary winding inductance in adjacent two-phase coupled inductance units without using external additional wires and without embedding internal wires in the first circuit board and the second circuit board, another structure is proposed in this embodiment. In one embodiment, as Figure 13 shown, the fourth solution includes: an inductance fitting conductor is disposed in the inner cavity of the package housing, and the compensation inductor is integrated in the inductance fitting conductor; the other end of the secondary winding inductance of the previous phase is connected to one end of the inductance fitting conductor; the other end of the inductance fitting conductor is connected to one end of the secondary winding inductance of the subsequent phase.

[0086] Among them, the compensation inductor is integrated in the inductance fitting conductor, and the two ends of the adjacent two secondary winding inductors are directly connected through the inductance fitting conductor. In order to save the internal space of the package housing, in one embodiment, the inductance fitting conductor can be arranged in parallel with the second circuit board. Figure 13 shown in includes two-phase coupled inductance units and an inductance fitting conductor. Similarly, when multiple-phase coupled inductance units are included, it is necessary to ensure that the length of the secondary winding inductance in each phase of the coupled inductance unit is small enough in the vertical direction (i.e., the proportion in the vertical direction is small), and in the horizontal direction, it is necessary to ensure that the length of the inductance fitting conductor is also small enough (i.e., the proportion of the distance between the main circuit inductance in the first-phase coupled inductance unit and the main circuit inductance in the last-phase coupled inductance unit in the horizontal direction is small).

[0087] For example, if the proportion of the length of the secondary winding inductance in the vertical direction to the length of the main circuit inductance is x, and the proportion of the length of the inductance fitting conductor in the horizontal direction to the total length of the main circuit inductance from the first-phase main circuit inductance to the last-phase main circuit inductance is y. When two-phase coupled inductance units are included, x = 1 / 2, y = 1; when three-phase coupled inductance units are included, x = 1 / 3, y = 1 / 2; as Figure 14 shown, when four-phase coupled inductance units are included, x = 1 / 4, y = 1 / 3, and so on, to obtain the lengths of each secondary winding inductance and the inductance fitting conductor. According to the above settings of the proportion x of the length of each secondary winding inductance and each compensation inductor in the vertical direction to the length of the main circuit inductance and the proportion y of the length in the horizontal direction to the total length of the main circuit inductance from the first-phase main circuit inductance to the last-phase main circuit inductance, all devices (including secondary winding inductors and compensation inductors) can be arranged in the package housing when the integrated inductance unit includes multiple-phase coupled inductance units, ensuring the integrity and wholeness of the inductive voltage regulator structure.

[0088] Specific values of x and y need to be determined according to actual design requirements, size limitations of the package housing, circuit performance requirements, etc., and are not specifically limited in this embodiment.

[0089] In the above embodiments, four different solutions are proposed to connect the two ends of the secondary winding inductance in adjacent two-phase coupled inductance units in sequence without using external additional wires. Without considering the influence of the lengths of the secondary winding inductance and the compensation inductance, in the first, second, and third solutions, the compensation inductance can form a preset angle with the second circuit board. To save space, the preset angle can be 90°. In the fourth solution, to save space, the inductive chimeric conductor can be arranged parallel to the second circuit board.

[0090] In one embodiment, as Figure 15 and Figure 16 shown, the inductive voltage regulator with integrated compensation inductance further includes a plurality of switching units. Each of the coupled inductance units is correspondingly connected to a switching unit. The switching unit includes a first switching transistor (i.e., Q1, Q3, Q5, or Q7) and a second switching transistor (i.e., Q2, Q4, Q6, or Q8). The first switching transistor and the second switching transistor are both arranged on the first circuit board. One end of the first switching transistor is used to connect to the input voltage. The other end of the first switching transistor is respectively connected to one end of the second switching transistor and one end of the main circuit inductance. The other end of the second switching transistor is grounded.

[0091] Among them, each phase of the coupled inductance unit corresponds to a switching unit, that is, each phase of the coupled inductance unit includes a first switching transistor and a second switching transistor. The first switching transistor and the second switching transistor are periodically turned on and off. The input voltage (Vin) is chopped into a pulse signal through high-frequency switching actions to control the energy storage and release of the inductive voltage regulator.

[0092] In the conduction stage, when the first switching transistor (such as Q1) is turned on, the input voltage charges the main circuit inductance, and the current linearly rises. The energy is stored in the main circuit inductance. After the first switching transistor is turned off, the second switching transistor (such as Q2) is turned on (synchronous rectification), and the current in the main circuit inductance continues to flow through the low side, and the energy is released to the load. The conduction time ratio (i.e., the duty cycle of the switching transistor) is adjusted in real time according to the load change to maintain the stability of the output voltage (Vout). In one embodiment, the PWM controller corresponding to the switching transistor monitors the feedback of the output voltage Vout. When the load suddenly increases, the duty cycle is increased to quickly supplement energy. When the load decreases, the duty cycle is decreased to prevent overshoot.

[0093] In one embodiment, referring to Figure 16, the inductive voltage regulator with integrated compensation inductor further includes an input filter unit and an output filter unit. One end of the input filter unit is connected to the input voltage, and the other end of the input filter unit is grounded; one end of the output filter unit is connected to one end of the main circuit inductor, and the other end of the output filter unit is grounded. The input filter unit and the output filter unit are both disposed on the first circuit board or the second circuit board.

[0094] Among them, the input filter unit includes capacitor C1, and the output filter unit includes capacitor C2 and capacitor C3. The input voltage often contains various high-frequency noises and interference signals, and these high-frequency noises and interference signals may have an adverse effect on the normal operation of the internal circuit of the module. The main function of the input filter unit is to filter out these high-frequency noises and interference signals.

[0095] The input filter unit and the output filter unit work together to provide a good filtering effect for the entire inductive voltage regulator with integrated compensation inductor. The input filter unit ensures the purity of the input voltage and reduces the influence of external interference on the internal circuit of the module. The output filter unit ensures the stability and high quality of the output voltage, meeting the requirements of the load device for the power supply.

[0096] In this embodiment, the coupled inductor unit and the compensation inductor are both integrated inside the package housing. The compensation inductor is connected in series between the inductors of the secondary windings of adjacent two phases. The two ends of the compensation inductor can be respectively disposed on different planes. In the connection of the inductors of the secondary windings of adjacent two phases, the tail end of the secondary winding inductor of the previous phase and one end of the corresponding compensation inductor are on the same soldering surface, and the head end of the secondary winding inductor of the latter phase and the other end of the corresponding compensation inductor are on the same soldering surface, that is, it is ensured that the two ends of the compensation inductor and the two ends of the corresponding secondary winding inductor are on the same soldering surface, solving the problem of circuit connection and eliminating the need for external wiring, thus making the structure of the inductive voltage regulator more concise.

[0097] Embodiment 2:

[0098] In some application scenarios, on the premise of not considering the problem that the two ends of the secondary winding inductors in the polyphase coupled inductor unit are not on the same soldering surface and external wires are required to connect the two ends of the secondary winding inductors of adjacent two phases, as Figure 17 shown, a compensation inductor can also be connected in series between the inductors of the secondary windings in each two-phase coupled inductor unit. That is, when including N-phase coupled inductor units, N / 2 compensation inductors need to be provided.

[0099] In other embodiments, in the design of an inductive voltage regulator integrated with N (N>2) phase-coupled inductor units, a compensation inductor can be placed between any adjacent phases according to requirements. In Embodiment 1, considering that the two ends of the secondary winding inductance in adjacent phase-coupled inductor units are connected through a compensation inductor without the need for external wiring, that is, a compensation inductor is placed between each adjacent phase. In one embodiment, any position and number of compensation inductors can be selected from the N secondary winding inductors according to actual requirements. The multiple compensation inductors evenly distribute the large voltage borne by the original independent compensation inductor among them, and the voltage value borne by each compensation inductor is greatly reduced, thereby ensuring the stability of the inductive voltage regulator.

[0100] Embodiment 3:

[0101] To further illustrate the inductive voltage regulator with an integrated compensation inductor proposed in Embodiment 1 and Embodiment 2, a power supply module is proposed in this embodiment. The power supply module includes at least one inductive voltage regulator with an integrated compensation inductor.

[0102] In this embodiment, both the coupled inductor unit and the compensation inductor are integrated inside the package housing. The compensation inductor is connected in series between the secondary winding inductors of adjacent phases. The two ends of the compensation inductor can be respectively arranged on different planes. In the connection of the secondary winding inductors of adjacent phases, the tail end of the secondary winding inductor of the previous phase and one end of the corresponding compensation inductor are on the same welding surface, and the head end of the secondary winding inductor of the next phase and the other end of the corresponding compensation inductor are on the same welding surface, that is, it is ensured that the two ends of the compensation inductor and the two ends of the corresponding secondary winding inductor are on the same welding surface, solving the problem of circuit connection without the need for external wiring, thus making the structure of the inductive voltage regulator more concise.

[0103] On the other hand, in this embodiment, the large voltage borne by the original independent compensation inductor is evenly distributed among multiple compensation inductors, and the voltage value borne by each compensation inductor is greatly reduced, ensuring the stability of the inductive voltage regulator.

[0104] Regarding the specific structure of the inductive voltage regulator with an integrated compensation inductor, refer to Embodiment 1 and will not be elaborated in this embodiment.

[0105] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inductive voltage regulator integrated with a compensating inductor, characterized in that, It includes a packaging shell, a first circuit board, a second circuit board, and an integrated inductor unit disposed between the first circuit board and the second circuit board. The first circuit board and the second circuit board are respectively disposed on two sides of the packaging shell; The integrated inductor unit includes a plurality of coupled inductor units and at least one compensating inductor. At least one compensating inductor is disposed between two adjacent coupled inductor units. The coupled inductor unit includes a main circuit inductor and a secondary winding inductor, and the secondary winding inductor is coupled with the main circuit inductor; One end of the main circuit inductor is used for connecting to an input voltage, and the other end of the main circuit inductor is used for connecting to a power-consuming end; One end of the compensating inductor is connected to the secondary winding inductor of the previous phase; the other end of the compensating inductor is connected to the secondary winding inductor of the next phase.

2. The inductive voltage regulator integrated with a compensating inductor according to claim 1, characterized in that, At least a first solder joint, a second solder joint, and a third solder joint are disposed on the first circuit board; at least a fourth solder joint, a fifth solder joint, and a sixth solder joint are disposed on the second circuit board; The second solder joint and the third solder joint are connected through an internal wire in the first circuit board; the fourth solder joint and the fifth solder joint are connected through an internal wire in the second circuit board; One end of the secondary winding inductor of the previous phase is connected to the first solder joint, and the other end of the secondary winding inductor of the previous phase is connected to the fourth solder joint; one end of the compensating inductor is connected to the fifth solder joint, the other end of the compensating inductor is connected to the second solder joint, one end of the secondary winding inductor of the next phase is connected to the third solder joint, and the other end of the secondary winding inductor of the next phase is connected to the sixth solder joint.

3. The inductive voltage regulator with an integrated compensation inductor according to claim 2, characterized in that, An insulating cavity is disposed on one side of the packaging shell, the compensating inductor is disposed in the insulating cavity, and both ends of the compensating inductor are exposed from the insulating cavity.

4. The inductive voltage regulator with integrated compensation inductor according to claim 1, characterized in that At least a first conductive member and a second conductive member are disposed in the inner cavity of the packaging shell; The other end of the secondary winding inductor of the previous phase is connected to one end of the first conductive member, and the other end of the first conductive member is connected to one end of the compensating inductor; the other end of the compensating inductor is connected to one end of the second conductive member, and the other end of the second conductive member is connected to one end of the secondary winding inductor of the next phase.

5. The inductive voltage regulator with integrated compensation inductor according to claim 1, characterized in that, An inductor fitting conductor is disposed in the inner cavity of the packaging shell, and the compensating inductor is integrated in the inductor fitting conductor; The other end of the secondary winding inductor of the previous phase is connected to one end of the inductor fitting conductor; the other end of the inductor fitting conductor is connected to one end of the secondary winding inductor of the next phase.

6. The inductive voltage regulator integrated with a compensating inductor according to any one of claims 1-5, characterized in that It further includes a plurality of switch units. Each coupled inductor unit is correspondingly connected to a switch unit. The switch unit includes a first switching tube and a second switching tube, and both the first switching tube and the second switching tube are disposed on the first circuit board; One end of the first switching tube is used for connecting to an input voltage, the other end of the first switching tube is respectively connected to one end of the second switching tube and one end of the main circuit inductor, and the other end of the second switching tube is grounded.

7. The inductive voltage regulator integrating a compensation inductor according to any one of claims 1-5, characterized in that It further includes an input filter unit and an output filter unit. One end of the input filter unit is connected to an input voltage, and the other end of the input filter unit is grounded; one end of the output filter unit is connected to one end of the main circuit inductor, and the other end of the output filter unit is grounded.

8. The inductive voltage regulator integrating a compensation inductor according to any one of claims 1-5, characterized in that, The coupling coefficient between the compensation inductor and two adjacent coupled inductor units is less than or equal to a preset value.

9. The inductive voltage regulator with an integrated compensation inductor according to any one of claims 1-5, characterized in that, The compensation inductor forms a preset angle with the second circuit board.

10. A power supply module, characterized in that, It includes at least one inductive voltage regulator integrating a compensation inductor as described in any one of claims 1-9.

Images