WO2023005736A1

WO2023005736A1 - Inductor, voltage control circuit, and detection and control method for voltage control circuit

Info

Publication number: WO2023005736A1
Application number: PCT/CN2022/106485
Authority: WO
Inventors: 李建国; 刘彬; 张伟; 周建平
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-07-29
Filing date: 2022-07-19
Publication date: 2023-02-02
Also published as: CN115691972A

Abstract

An inductor, a voltage control circuit, and a detection and control method for the voltage control circuit. The inductor comprises: yoke portions, the yoke portions comprising a first yoke portion (101) and a second yoke portion (102) which are mutually connected; column portions provided with air gaps (203), the column portions comprising a first column portion (201) and a second column portion (202), and the first column portion (201) and the second column portion (202) being vertically connected to the first yoke portion (101); and coils, the coils comprising a first coil and a second coil, the first coil being wound on the first column portion (201), and the second coil being wound on the second column portion (202), wherein a cross-sectional area of the first yoke portion (101) is half of a cross-sectional area of the first column portion (201) or the second column portion (202).

Description

Inductor, voltage control circuit, detection and control method of voltage control circuit

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202110863099.8 and a filing date of July 29, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to the field of circuit technology, in particular to an inductor, a voltage control circuit, and a detection and control method for the voltage control circuit.

Background technique

Inductors are a common electronic device in electronic circuits. Inductors appear in many circuits. For example, in complex electrical systems such as circuits that combine multiple systems, the number of inductors used varies. In many cases, such as multiple energy storage inductors for energy storage, current transformers for current detection and protection, etc., when the number of inductors increases, if they are made into discrete devices, the number of devices will increase. Many and bulky, and now switching power supplies are developing towards high frequency, high power density, and miniaturization. Therefore, inductors in related technologies cannot be miniaturized and lightweight, and cannot adapt to the development of technology.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

The embodiment of the present application provides an inductor, a voltage control circuit, and a detection and control method for the voltage control circuit.

In a first aspect, an embodiment of the present application provides an inductor, including: a yoke, the yoke includes a first yoke and a second yoke connected to each other; a column, an air gap is provided on the column , the post includes a first post and a second post, the first post and the second post are connected perpendicularly to the first yoke, respectively; a coil, the coil includes a first coil and a The second coil, the first coil is wound on the first column, and the second coil is wound on the second column; wherein, the cross-sectional area of the first yoke is the half of the cross-sectional area of the first pillar or the second pillar.

In a second aspect, the embodiments of the present application provide a voltage control circuit, including the inductor described in any one of the embodiments of the first aspect of the present application.

In the third aspect, the embodiment of the present application provides a detection method for a voltage control circuit, which is applied to the voltage control circuit described in the embodiment of the second aspect of the application, and the voltage control circuit includes a comparator, a first winding and a The second winding, the first winding includes the first coil and the second coil, the second winding includes a third coil and a fourth coil, the detection method of the voltage control circuit includes: obtaining the second winding The induced current is obtained by induction of the second winding according to the inductive current of the first winding; the induced current is input to the comparator to obtain the output signal of the comparator; when the The output signal changes from the first signal to the second signal to determine the zero-crossing point of the inductor current.

In a fourth aspect, the embodiment of the present application provides a method for controlling a voltage control circuit, which is applied to the voltage control circuit described in the embodiment of the second aspect of the present application. The voltage control circuit includes a comparator, a first winding and a The second winding, the first winding includes the first coil and the second coil, the second winding includes a third coil and a fourth coil, the control method of the voltage control circuit includes: obtaining the second winding The sampling voltage; output the reduction current to the comparator according to the sampling voltage, and obtain the output signal of the comparator, the reduction current corresponds to the inductor current of the first winding; if the peak value of the reduction current Above the preset threshold, the output signal is controlled to change from the first signal to the second signal.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

FIG. 1 is a schematic structural diagram of an inductor provided by some embodiments of the present application;

Fig. 2 is a schematic diagram of a digital model of an inductor provided by some embodiments of the present application;

Fig. 3 is a schematic diagram of the magnetic circuit of the inductor provided by some embodiments of the present application;

Fig. 4 is a schematic diagram of a magnetic circuit of an inductor provided by another embodiment of the present application;

FIG. 5 is a schematic structural diagram of inductors provided by other embodiments of the present application;

FIG. 6 is a schematic structural diagram of an inductor provided by another embodiment of the present application;

FIG. 7 is a flow chart of a detection method for a voltage control circuit provided by some embodiments of the present application;

FIG. 8 is a schematic diagram of the winding of an inductor provided by some embodiments of the present application;

Fig. 9 is a schematic diagram of the winding of an inductor provided by another embodiment of the present application;

Fig. 10 is a detection schematic diagram provided by some embodiments of the present application;

Fig. 11 is a detection principle diagram provided by other embodiments of the present application;

Fig. 12 is a detection schematic diagram provided by other embodiments of the present application;

Fig. 13 is a flowchart of a control method of a voltage control circuit provided by some embodiments of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

It should be understood that in the description of the embodiments of the present application, multiple (or multiple) means more than two, greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the indicated The sequence relationship of the technical characteristics.

The embodiment of the present application provides an inductor, a voltage control circuit, and a detection and control method for the voltage control circuit, which can reduce the size of the inductor and realize miniaturization and light weight production of the inductor.

1 and 2, the embodiment of the present application provides an inductor, the inductor includes a yoke, a column and a coil, the yoke includes a first yoke 101 and a second yoke 102 connected to each other, the column An air gap 203 is arranged on the part, and the column part includes a first column part 201 and a second column part 202, and the first column part 201 and the second column part 202 are magnetic core columns, and the first column part 201 and the second column part 202 They are vertically connected to the first yoke 101 respectively, and the first yoke 101 is connected to the first column 201 and the second column 202 respectively as an upper vertical yoke and a lower vertical yoke. In one embodiment, the second yoke 102 Perpendicular to the first yoke 101, the second yoke 102 is arranged as a parallel yoke on both sides of the column in parallel, the application does not specifically limit it, each column includes at least one coil, and the coil includes the first coil and The second coil, the first coil is wound on the first column part 201, the second coil is wound on the second column part 202, the cross-sectional area of the first yoke part 101 is the first column part 201 or the second column part 202 Half of the cross-sectional area, wherein, due to the existence of the air gap 203, the magnetic resistance of the pillars is relatively large, so the mutual coupling is small, the first pillar 201 and the second pillar 202 are both provided with an air gap 203, and the air The number of gaps 203 can be set according to actual power requirements, and the present application does not specifically limit it. The first yoke 101 is the common yoke of the first column 201 and the second column 202, and the first coil and the second coil can be As the first winding, it is the main winding in the inductor. In an embodiment, the inductor can also set the third coil and the fourth coil as the second winding, which is the auxiliary winding in the inductor. The first coil and the third The coil is wound on the first column part 201, the first coil and the second coil are respectively used as inductance L1 and inductance L2 as energy storage inductance, the third coil is the current transformer of the first coil, and the fourth coil is the second coil of current transformers. The inductor in the embodiment of the present application is an integrated inductor of a plurality of magnetic devices, the cross-sectional area of the first yoke 101 connecting each pillar is only half of the cross-sectional area of the pillar, and the magnetic permeability of the first yoke 101 is not affected by Limitation, through the coupling and decoupling combination of the magnetic circuit, the integration of at least two discrete devices is completed, thereby reducing the size of the inductor, especially the overall height of the inductor, improving the power density of the product, and realizing the miniaturization of the inductor. Lightweight production.

5, in some embodiments of the present application, the first yoke 101 is provided with two, that is, two vertical yokes up and down, and the first yoke 101 includes a first sub-yoke 1011 and a second sub-yoke 1012, the first sub-yoke part 1011 is an upper vertical yoke, the second sub-yoke part 1012 is a lower vertical yoke, and the first column part 201 is divided into upper and lower first sub-column parts 2011 and second sub-column parts according to the air gap 203 2012, the second column part 202 is divided into the upper and lower third sub-column part 2021 and the fourth sub-column part 2022 according to the air gap 203, the first sub-column part 2011 and the third sub-column part 2021 are vertically connected to the first sub-yoke part 1011, the second sub-pillar part 2012 and the fourth sub-pillar part 2022 are respectively vertically connected to the second sub-yoke part 1012. In the embodiment of this application, the integrated design of 6 independent devices is realized, so that 6 The magnetic device is integrated and the upper and lower height dimensions of the inductor are reduced, the overall height is controlled, and the purpose of miniaturization is achieved. In the embodiment of the present application, the magnetic core formed by the inductor is a pair of symmetrical magnetic core double columns.

It should be noted that, in some embodiments of the present application, referring to FIG. 1 and FIG. 2 , they are the schematic diagrams of the magnetic circuit of the inductor, the inductor L1 is wound on the first column part 201 corresponding to the first coil, and the first The column reluctance of the magnetic core of the column part 201 is R11, and the upper half yoke perpendicular to the first column part 201, that is, the reluctance of the side of the first yoke part 101 is R12. The magnetic cores are all symmetrically arranged, so the reluctance of the lower half yoke, that is, the first yoke part 101 below is also R12. Similarly, the reluctance of the second yoke part 102 is R13, and the reluctance of the right device is also respectively It is R22, R23, and there are:

R12=R22, R13=R23;

At the same time, the size relationship is:

R11>>R12, R11>>R13, R21>>R22, R21>>R23;

Therefore, the magnetic flux generated by the inductor L1 returns from the two parallel branches of R12 and R22. Due to the existence of the air gap 203, the magnetic flux does not pass through R21. Similarly, the magnetic flux generated by the inductor L2 does not pass through R11. It can be known from the equivalent principle of the magnetic circuit , when the inductor L1 works, its magnetomotive force equation is as follows:

F11＝N1*I1＝Φ11*R11+Φ11*(2*R12+R13)/2;

That is, the magnetic flux generated by the magnetomotive force of the inductance winding L1 returns from the upper vertical yoke, the left and right parallel yokes, and the lower vertical yoke to form a closed magnetic circuit. At this time, the magnetic fluxes of the left and right yokes are equal, equal to half of the magnetic flux of the branch R11 , that is, Φ1 _left =Φ1 _right =Φ11/2, and because Φ1 _left =B*S _left , S _left =h*d, wherein h is the height of the first yoke 101, that is, the upper and lower yokes, and d is the first yoke The thickness of 101, because the magnetic line of force is a closed curve, it can be concluded that after the magnetic circuit is connected in parallel, the cross-sectional area of the upper and lower common yokes only needs to be half of the cross-sectional area of the winding post, and because the magnetic permeability of the common yoke is not limited , so it only needs to satisfy that the cross-sectional area is half of the cross-sectional area of the first column part 201 or the second column part 202. When the inductance L2 works, the magnetic circuit and the inductance L1 work in the same way, so the application reduces the upper and lower parallel yokes The overall height dimension realizes the miniaturization of the device. In one embodiment, the volume and shape of the first column part 201 and the second column part 202 are the same, the cross-sectional area of the first yoke part 101 is half of the cross-sectional area of the first column part 201 and the second column part 202, and the inductance The inductor is a mesh-shaped inductor, that is, a pair of symmetrical mesh-shaped magnetic cores, which can reduce the bonding area of the inductor and reduce the leakage inductance. The inductor is integrally formed, and the parameters of the finished electrical appliance are consistent. Under the premise of the requirements of the example, the first column portion 201 and the second column portion 202 may also be in other forms, which are not specifically limited in this application.

In some embodiments of the present application, the thickness of the first yoke portion 101 is equal to the thickness of the first column portion 201 or the second column portion 202, and the height of the first yoke portion 101 is equal to that of the first column portion 201 or the second column portion 202. half of the width, since the cross-sectional area of the first yoke 101 is half of the cross-sectional area of the first column 201 or the second column 202, if the thickness of the first yoke 101 is designed to be the same as the first column 201 or the second If the thicknesses of the pillars 202 are equal, then the height of the first yoke 101 can be controlled to be half of the width of the first pillar 201 or the second pillar 202, thereby reducing the design height of the inductor. In one embodiment, due to The dimensions of the first post 201 and the second post 202 are the same, and the thickness of the first yoke 101 is equal to the thickness of the first post 201 and the second post 202, so the height of the first yoke 101 is equal to that of the first post. 201 and half of the width of the second column part 202, in the production design of the inductor, the thickness of the first yoke part 101 is designed to be equal to the thickness of the first column part 201 or the second column part 202, which can reduce the bonding of the inductor Area, reduced leakage inductance, integral molding of inductors, good consistency of finished electrical parameters, thereby reducing the size of the inductor, especially the overall height of the inductor, improving the power density of the product, and realizing the miniaturization and light weight of the inductor Production.

In some embodiments of the present application, the third coil is an auxiliary coil of the first coil, the third coil includes several first sub-coils and the several first sub-coils are wound on the first column part 201, and the fourth coil It is the auxiliary coil of the second coil, the fourth coil includes several second sub-coils and the several second sub-coils are respectively wound on the second column part 202, that is, the inductance formed by the third coil and the fourth coil is used as the current Transformer, the third coil can be wound by a plurality of first sub-coils, different numbers of first sub-coils can be set according to the actual needs and the application scenarios of the inductor, and the fourth coil can be made of multiple second sub-coils It is wound, and different numbers of second sub-coils can be set according to the actual needs and the application scenarios of the inductor. In the drawings of the embodiment of this application, the third coil and the fourth coil are respectively provided with two sub-coils as an example. , but it is not meant as a limitation to the present application. The inductance formed by the two first sub-coils is inductance L3 and inductance L4, and the inductance formed by the two second sub-coils is inductance L5 and inductance L6, so multiple coils can be realized Winding, multiple first sub-coils can be short-circuited or disconnected, multiple second sub-coils can be short-circuited or disconnected, and the sub-coils can be short-circuited and disconnected according to different The turn ratio needs to be set. By setting short-circuit and disconnection, the number of turns of the third coil and the fourth coil can be changed. Setting more than two groups can realize different functions and realize weak coupling between coils.

In some embodiments of the present application, the first coil and the third coil are concentrically wound on the first column part 201, and the second coil and the fourth coil are concentrically wound on the second column part. On 202, multi-winding winding is realized. In one embodiment, the first coil and multiple first sub-coils are concentrically wound on the first column part 201, and the first coil is wound on the first column part 201, the first sub-coils are respectively wound on the outer layer of the first column part 201, the second coil and multiple second sub-coils are concentrically wound on the second column part 202, and the second The coil is wound on the inner layer of the second column part 202, and the first sub-coils are respectively wound on the outer layer of the second column part 202, so as to realize tight coupling between multiple windings on the same column.

Referring to FIG. 1, in some embodiments of the present application, the post is set as an elliptical core post, the first coil and the third coil are respectively wound on the first elliptical post 201, the second coil and The fourth coils are respectively wound on the second elliptical column part 202. The column part in the embodiment of the present application is a segmented elliptical magnetic core column containing an air gap 203, and its cross-sectional area is the cross-sectional area of the first yoke part 101 Twice as many coils, and the columns are all designed as elliptical structures. Under the same cross-sectional size, the winding space in the width and thickness directions can be used more reasonably, and the coil winding is easier to batch mechanized processing, which improves production efficiency.

Referring to FIG. 1 , in some embodiments of the present application, the second yoke 102 is provided with a groove 1021 corresponding to the shape of the elliptical column, and a groove 1021 corresponding to the shape of the elliptical stem is formed in the second yoke 102 . The corresponding groove 1021 enables the second yoke 102 to improve the utilization rate of the magnetic core window, increase the coupling of more coils in the center column, and reduce the weight and cost at the same time. In one embodiment, the two sides of the second yoke 102 are on the inner side The groove 1021 with a C-shaped structure can increase the winding window of the coil, and for the winding of multiple windings, the space utilization rate is improved, making it possible to wind multiple windings coaxially.

Referring to Fig. 1, in some embodiments of the present application, an opening 103 for leading out the coil is provided on the yoke. By using the opening 103, it is convenient to lead out the first and last electrical connection terminals of the inductor, which is convenient for PCB installation and saves space. Size, the opening 103 is hollowed out, which is convenient for the coil lead wires to go out, so that the overall volume size of the integrated inductor can be controlled. In one embodiment, the opening 103 is arranged on the lower vertical yoke of the first yoke 101, and the opening 103 adopts a triangular shape. The opening 103 is designed to facilitate the extraction of the first and last electrical connection terminals of the inductor. Under the premise of meeting the requirements of the embodiment of this application, the opening 103 can also adopt a semicircular, square or other shape, which is not specifically limited in this application.

Referring to FIG. 6, in some embodiments of the present application, a plurality of pins 104 are also included, and the pins 104 correspond to the coils one by one. The pins 104 are connected to the yoke. In one embodiment, the first coil , the second coil, the third coil and the fourth coil are all provided with positive and negative pins 104, wherein, if the third coil and the fourth coil are respectively provided with a plurality of first sub-coils and a plurality of second sub-coils, The pins 104 of multiple first sub-coils can be short-circuited, and the turn ratio relationship on the first column 201 can be changed. Similarly, the pins 104 of multiple second sub-coils can be short-circuited, and the turn ratio relationship can also be changed. The turn ratio relationship on the second column part 202 facilitates the application of the inductor through the setting of the pin 104 , and facilitates its access and use in multiple application scenarios.

It should be noted that, in some embodiments of the present application, the column part can be a powder core or segmented high magnetic permeability core combination, which contains an air gap 203, which can reduce the coupling between windings and reduce the first For the coupling between the column part 201 and the second column part 202, the yoke part may include at least one of a powder magnetic core, an amorphous magnetic core, a silicon steel sheet magnetic core, a nanocrystalline magnetic core, and ferrite. This application It is not specifically limited.

The present application also provides a voltage control circuit, including the inductor described in any one of the above-mentioned embodiments of the present application. The voltage control circuit can realize the voltage control function by applying the inductor in the embodiment of the present application, and can also To achieve the voltage conversion function, in one embodiment, the voltage control circuit realizes the miniaturization and light weight of the circuit design by using an inductor, reduces the design space of the circuit, reduces the production cost, and is convenient for integration and large-scale For production, the voltage control circuit may include electronic components in other circuits to achieve specific functions, which are not specifically limited in this application.

The present application also provides a detection method for a voltage control circuit, which is applied to the voltage control circuit described in the above-mentioned embodiments of the present application. The voltage control circuit includes a comparator, a first winding, and a second winding, and the first winding includes a second winding. A coil and a second coil, the second winding includes a third coil and a fourth coil, as shown in Figure 7, the detection method of the voltage control circuit in the embodiment of the present application may include but not limited to step S110, step S120 and step S130 .

Step S110, acquiring the induced current of the second winding.

Step S120, input the induced current to the comparator, and obtain the output signal of the comparator.

Step S130, when the output signal changes from the first signal to the second signal, determine the zero-crossing point of the inductor current.

In some embodiments of the present application, the detection method of the voltage control circuit can realize the zero-crossing detection of the inductor current, and the induced current is obtained by the induction of the second winding according to the inductor current of the first winding, and the detection method of the voltage control circuit can be through the circuit In its circuit, the second winding induces the induced current, and after the induced current is input to the comparator, the comparator first outputs the first signal, and continuously obtains the output signal of the comparator. When the output signal is changed by the first signal It is transformed into the second signal, that is, the direction of the inductor voltage or current is reversed, and the zero-crossing point of the inductor current is determined to realize the zero-crossing detection of the inductor current. The comparator can be a comparator set in the voltage control circuit, or an external comparator , the application does not specifically limit it.

In one embodiment, referring to FIG. 8 and FIG. 9 , it is a schematic diagram of an inductor winding, the first coil corresponds to the inductance L1, the second coil corresponds to the inductance L2, and the two first sub-coils in the third coil correspond to the inductance L3 With L4, the two second sub-coils in the fourth coil correspond to inductors L5 and L6. In the schematic diagram, the inductor L1 is between

pins

1 and 2, the inductor L2 is between pins 3 and 4, and inductors 5, 6 and 7, Pin 8 is the auxiliary winding L3, L4 of the inductor L1, and pins 9, 10 and 11, 12 are the auxiliary windings L5, L6 of the inductor L2. When the inductors L1 and L2 pass a current, due to the principle of electromagnetic induction, each auxiliary winding induces a current corresponding to the relationship of the turn ratio, the primary side can correspond to the first winding, and the secondary side can correspond to the second winding.

Fig. 6 is a physical map of the transformation of the schematic diagrams in Fig. 8 and Fig. 9. According to a certain circuit topology application, L1, L2 and the corresponding pins of the auxiliary winding can be short-circuited for use. Referring to Figure 10 and Figure 11, taking the totem pole topology as an example, by detecting the zero point of the energy storage inductor current, and then turning on the MOS tube and other switching tubes, the zero-voltage switching on of the current can be realized. The voltage control circuit can be a ZCD detection circuit (inductor current zero-crossing detection circuit), which is the core of the totem pole control structure. Whether it can be turned on at zero voltage depends on whether the current zero point can be accurately detected. The auxiliary winding of the energy storage inductor can detect the voltage on the energy storage inductor. When the PFC works in TCM mode, the moment when the inductor voltage direction is reversed is the moment when the inductor current crosses zero. The ZCD detection circuit realizes the detection of the inductor current through this. Zero-crossing detection. Referring again to Figure 12, short-circuit the corresponding pins of the two inductors and the auxiliary winding, use the current signals ZCD1, ZCD2, ZCD3, and ZCD4 induced by the secondary side to realize the zero-crossing judgment of the primary side inductor current, and the relevant signals enter the comparator , the output signal of the comparator enters the processor, which may change from a first signal of high level to a second signal of low level. When the output of the comparator is reversed, the processor captures the signal for zero-crossing judgment.

The present application also provides a control method for a voltage control circuit, which is applied to the voltage control circuit described in the above-mentioned embodiments of the present application. The voltage control circuit includes a comparator, a first winding, and a second winding, and the first winding includes a second winding. A coil and a second coil, the second winding includes a third coil and a fourth coil, as shown in Figure 13, the control method of the voltage control circuit in the embodiment of the present application may include but not limited to step S210, step S220 and step S230 .

Step S210, acquiring the sampling voltage of the second winding.

Step S210, outputting the restored current to the comparator according to the sampled voltage, and obtaining the output signal of the comparator, the restored current corresponds to the inductor current of the first winding.

Step S210, if the peak value of the restoring current is higher than the preset threshold, the control output signal is changed from the first signal to the second signal.

In some embodiments of the present application, the control method of the voltage control circuit can realize wave-by-wave protection of the inductor current, the control method of the voltage control circuit can be executed by a processor in the circuit, and the voltage control circuit can obtain the first The sampling voltage of the second winding can be calculated according to the sampling voltage to obtain the restored current, which corresponds to the inductor current of the first winding, which is equivalent to obtaining the inductor current of the first winding through voltage sampling. After the restored current enters the comparator, The output signal of the first signal is obtained. If the peak value of the restored current is higher than the preset threshold, the control output signal is changed from the first signal to the second signal to realize the forced pull-down of the drive and play the role of current limiting protection. The preset The threshold is a current threshold set in advance according to the needs of wave-by-wave protection. The comparator can be a comparator set in the voltage control circuit or an external comparator, which is not specifically limited in this application.

In one embodiment, the voltage sampling is performed through the auxiliary winding of the energy storage inductor, and the inductor current is obtained through indirect calculation, and the secondary side is charged and discharged through the RC circuit to restore the current waveform of the secondary side. The primary side can correspond to the first winding, and the secondary side can correspond to the second winding. When the circuit works in the linear region, the relationship between the secondary side voltage and the transformation value of the inductor current satisfies the following formula:

Vc=L*ΔI/nRC;

Among them, L is the inductance, n is the turn ratio, RC is the current charging resistance, Vc is the converted voltage signal, and △I is the primary inductor current. Taking the totem pole topology as an example, the Vc signal finally enters the internal comparator port (or external comparator) of the processor, and compares it with the reference of the preset threshold value. When the detected current peak value is higher than the set preset threshold value , the driver will be forcibly pulled low to control the switching off of the switching tube in the circuit, thereby limiting the current.

The embodiment of the present application at least includes the following beneficial effects: the inductor in the embodiment of the present application is an integrated inductor of a plurality of magnetic devices, including a plurality of coils and two secondary columns forming a closed magnetic circuit, and each column has at least For a coil, due to the existence of the air gap in the column, the magnetic flux of one column will not pass through the other column, and the cross-sectional area of the first yoke connecting each column is only half of the cross-sectional area of the column. The magnetic permeability of the yoke is not limited. Through the coupling and decoupling combination of the magnetic circuit, the integration of at least two discrete devices is completed, thereby reducing the size of the inductor, especially the overall height of the inductor, and improving the power density of the product. , to realize the miniaturization and lightweight production of inductors.

It should also be understood that the various implementation manners provided in the embodiments of the present application may be combined arbitrarily to achieve different technical effects.

The above is a specific description of several implementations of the present application, but the application is not limited to the above-mentioned implementations, and those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the application. These equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims

Inductors, including:

a yoke comprising a first yoke and a second yoke connected to each other;

a column part, the column part is provided with an air gap, and the column part includes a first column part and a second column part, and the first column part and the second column part are respectively perpendicular to the first yoke part connect;

a coil, the coil includes a first coil and a second coil, the first coil is wound on the first column, and the second coil is wound on the second column;

Wherein, the cross-sectional area of the first yoke is half of the cross-sectional area of the first post or the second post.
The inductor according to claim 1, wherein the thickness of the first yoke is equal to the thickness of the first column or the second column, and the height of the first yoke is the first half of the width of the post or said second post.
The inductor according to claim 1, wherein the coil further comprises a third coil and a fourth coil, the third coil is an auxiliary coil of the first coil, and the third coil comprises several first a sub-coil, and several of the first sub-coils are wound on the first column, the fourth coil is an auxiliary coil of the second coil, the fourth coil includes several second sub-coils and A plurality of the second sub-coils are wound on the second column.
The inductor according to claim 3, wherein the third coil includes a plurality of first sub-coils, the fourth coil includes a plurality of second sub-coils, and the plurality of first sub-coils short circuit or disconnection, multiple second sub-coils are short circuited or disconnected.
The inductor according to claim 1, wherein two first yoke portions are provided, the first yoke portion includes a first sub-yoke portion and a second sub-yoke portion, and the first column portion is configured according to the The air gap is divided into a first sub-column part and a second sub-column part, the second sub-column part is divided into a third sub-column part and a fourth sub-column part according to the air gap, the first sub-column part and the second sub-column part The third sub-pillar portion is vertically connected to the first sub-yoke portion, and the second sub-pillar portion and the fourth sub-pillar portion are respectively vertically connected to the second sub-yoke portion.
The inductor according to claim 3, wherein the first coil and the third coil are concentrically wound on the first column part, and the second coil and the fourth coil are The concentric circles are wound on the second column part.
The inductor according to claim 1, wherein the column portion is an elliptical core column, the first coil is wound on the elliptical first column portion, and the second coil is wound on the elliptical Shaped on the second column part.
The inductor according to claim 7, wherein the second yoke is provided with a groove corresponding to the shape of the elliptical column.
The inductor according to claim 1, wherein an opening for leading out the coil is provided on the yoke.
The inductor according to claim 1, further comprising a plurality of pins corresponding to the coils one by one, and the pins are connected to the yoke.
A voltage control circuit comprising the inductor as claimed in any one of claims 1-10.
The detection method of the voltage control circuit is applied to the voltage control circuit according to claim 11, the voltage control circuit includes a comparator, a first winding and a second winding, the first winding includes the first coil and the The second coil, the second winding includes a third coil and a fourth coil, and the detection method of the voltage control circuit includes:

Obtain the induced current of the second winding, the induced current is obtained by the induction of the second winding according to the inductive current of the first winding;

inputting the induced current into the comparator to obtain an output signal of the comparator;

When the output signal changes from the first signal to the second signal, the zero-crossing point of the inductor current is determined.
The control method of the voltage control circuit is applied to the voltage control circuit according to claim 11, the voltage control circuit includes a comparator, a first winding and a second winding, the first winding includes the first coil and the The second coil, the second winding includes a third coil and a fourth coil, and the control method of the voltage control circuit includes:

Obtain the sampling voltage of the second winding;

Outputting a restored current to the comparator according to the sampled voltage to obtain an output signal of the comparator, the restored current corresponding to the inductor current of the first winding;

If the peak value of the reduction current is higher than a preset threshold, the output signal is controlled to change from a first signal to a second signal.