WO2020153609A1

WO2020153609A1 - Variable inductance device and control method therefor

Info

Publication number: WO2020153609A1
Application number: PCT/KR2019/018054
Authority: WO
Inventors: 박종후; 김경탁
Original assignee: 숭실대학교 산학협력단
Priority date: 2019-01-23
Filing date: 2019-12-19
Publication date: 2020-07-30
Also published as: KR20200091666A; KR102185658B1

Abstract

A variable inductance device and a method for controlling the variable inductance device are disclosed. The variable inductance device comprises: a coupled inductor which is formed by a single core and multiple coils wound thereon; and a variable resistor which is connected to at least one coil among the multiple coils and distributes current flowing through the multiple coils according to changes in resistance value to vary inductance produced by the coupled inductor.

Description

Variable inductance device and control method therefor

The present invention relates to a variable inductance device and a control method thereof, and more particularly, to an inductance variable device capable of variable control of inductance by a coupling inductor and a control method thereof.

In general, an inductor means a coil that induces a voltage in proportion to the amount of change in current. The inductance exhibits a property that interferes with the flow of electric current due to a change in the magnetic field generated inside or around the coil.

Inductors used in power conversion circuits such as DC-DC converters, DC-AC inverters, etc. mainly have functions of current smoothing, current suppression, energy storage, and removal of high-frequency components of voltage and current due to semiconductor switching elements. Most inductors used in power conversion circuits have a fixed inductance value. Accordingly, it is not possible to properly respond to the newly required inductance value due to the surrounding environment or circuit changes.

Alternatively, variable inductors can be used. The variable inductor mainly has a structure including a coil and a core. Conventional variable inductors change the position of the core or generate additional magnetic force in the core to vary the inductance value using the magnetic saturation of the coil.

However, in the case of the method of moving the core, there is a disadvantage in that the power consumption of the driving actuator required for the movement of the core is large because the weight of the core is heavy, and in the case of the method using an additional magnetic force, energy loss due to magnetic saturation is caused. have.

An aspect of the present invention provides an inductance variable device and a control method for varying the inductance by using a characteristic in which a current flow is distributed according to a resistance value in a parallel connection structure.

The inductance variable device of the present invention for solving the above problems is connected to a coupling inductor formed by winding a plurality of coils on a single core and at least one coil among the plurality of coils, and is connected to the plurality of coils according to a change in resistance value. It includes a variable resistor for dispersing the flowing current to vary the inductance by the coupling inductor.

Meanwhile, the resistance value between the drain electrode and the source electrode may be changed according to the gate voltage of the variable resistor.

In addition, the feedback control method may further include a subtle controller that generates information on the gate voltage for generating a target inductance.

In addition, the coupling inductor, the plurality of coils are formed by winding in the same direction on the single core, the current flowing in the plurality of coils may flow in the same direction with the single core as an axis.

In addition, the coupling inductor may be formed by winding the plurality of coils in different directions on the single core so that current flowing through the plurality of coils flows in different directions with the single core as an axis.

Further, the variable resistor may be connected in series to at least one coil of the plurality of coils.

On the other hand, the inductance variable device of the present invention is a coupling inductor formed by winding a plurality of coils on a single core, and is connected in series to at least one coil of the plurality of coils, and receives current flowing through the plurality of coils according to a change in resistance value. It includes a variable resistor for dispersing and varying the inductance by the coupling inductor, and a degenerate controller for generating resistance value information of the variable resistor for generating a target inductance in a feedback control method.

On the other hand, the control method of the inductance variable device of the present invention, in a control method of an inductance variable device capable of varying the inductance by a coupling inductor formed by winding a plurality of coils on a single core, detecting electrical parameters from the coupling inductor Step, calculating an error between the electrical parameter and a target parameter, and generating resistance value information of a variable resistor connected in series with at least one coil of the plurality of coils using the calculated error to follow the target parameter And changing resistance values of the variable resistors using the resistance value information so that currents flowing through the plurality of coils can be distributed by the variable resistors.

According to the present invention, it is possible to minimize its own power consumption for variable inductance, and when applied to a power conversion system, it is possible to generate inductance that can optimize the performance of the system, and it is possible to continuously vary inductance.

1 is a view showing a variable inductance device according to an embodiment of the present invention.

2 and 3 are circuit diagrams showing an example in which a variable resistor is connected in series to the first coil shown in FIG. 1.

4 is a flow chart of a control method of a variable inductance device according to an embodiment of the present invention.

For a detailed description of the present invention, which will be described later, reference is made to the accompanying drawings that illustrate, by way of example, specific embodiments in which the invention may be practiced. These examples are described in detail enough to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and properties described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. In addition, it should be understood that the location or placement of individual components within each disclosed embodiment can be changed without departing from the spirit and scope of the invention. Therefore, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all ranges equivalent to those claimed. In the drawings, similar reference numerals refer to the same or similar functions across various aspects.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1, the inductance variable apparatus 1000 according to an embodiment of the present invention may include a combined inductor 100, a variable resistor 200, and a weak controller 300.

The inductance variable apparatus 1000 according to an embodiment of the present invention has a fixed inductance by the coupling inductor 100, and it is possible to vary the inductance according to a change in the resistance value of the variable resistor 200.

The inductance variable apparatus 1000 according to an embodiment of the present invention may generate a desired inductance value within a variable range of the inductance by the feedback controller-based subtle controller 300.

The inductance variable apparatus 1000 according to an embodiment of the present invention can be used as a variable inductance element that is normally required in a power conversion system, and can generate an inductance that can optimize the performance of the system.

The inductance variable apparatus 1000 according to an embodiment of the present invention may include a plurality of

coils

110 and 120 wound on a single core 101. In the following description, the first coil 110 and the second Two coils of the coil 120 are provided as an example.

The first coil 110 and the second coil 120 are formed by being wound around the single core 101 in the same direction so that the current flowing through the first coil 110 and the second coil 120 accumulates the single core 101. It can flow in the same direction.

Alternatively, the first coil 110 and the second coil 120 may be formed by being wound on a single core 101 in different directions. In this case, the current flowing through the first coil 110 and the second coil 120 is distributed and flows in different directions with the single core 101 as an axis, and thus the magnetic flux is canceled so that the current is very small. It can generate inductance.

The variable resistance 200 is a variable resistance element capable of adjusting the resistance value.

For example, the variable resistor 200 may be implemented as a transistor in which the resistance value between the drain and the source varies according to the gate voltage. At this time, the gate voltage of the transistor may be controlled to operate in an ohmic region, and the gate voltage may be controlled according to a signal applied from the subtle controller 300 described later.

The variable resistor 200 may be connected in series with at least one of the first coil 110 and the second coil 120. In FIG. 1, the variable resistor 200 is illustrated as being connected to the first coil 110, but may alternatively be connected to the second coil 120, or, the first coil 110 and the second coil 120 ).

The variable resistor 200 may vary the inductance by the coupling inductor 100 by dispersing the current flowing through the first coil 110 and the second coil 120 by adjusting the resistance value. A detailed description in this regard will be described later with reference to FIG. 2 and below.

The floating controller 300 is a linear or nonlinear controller, and may generate resistance value information of the variable resistor 200 for generating a target inductance in a feedback control method.

To this end, the poor controller 300 may detect a predetermined electrical parameter corresponding to the element associated with the inductance value from the coupling inductor 100. The floating controller 300 may be directly or indirectly connected to the coupling inductor 100 or directly or indirectly connected to the power conversion system to detect various electrical parameters.

For example, the poor controller 300 may detect electrical parameters including at least one of voltage, current, phase, and magnitude observed at a predetermined portion of the coupling inductor 100 or circuit elements constituting the power conversion system. have.

The variable controller 300 can receive a target parameter from the outside, calculates an error by comparing the detected electrical parameter with the target parameter, and uses the calculated error to vary the resistance 200 required for tracking the target parameter It is possible to generate the resistance value information.

That is, the poor controller 300 sets the target parameter as a reference value, and allows the currently measured electrical parameter to follow the reference value. It can calculate mutual error in real time and generate resistance value information to offset the error. .

For example, the resistance value information may correspond to the gate voltage (or current) of the variable resistor 200 implemented by a transistor.

The negative controller 300 may apply a signal corresponding to the resistance value information to the variable resistor 200 to control the resistance value to generate a target inductance from the variable resistor 200. That is, the poor controller 300 may control the resistance of the variable resistor 200 by a feedback control method, thereby ultimately controlling the inductance by the coupling inductor 100.

The first coil 110 and the second coil 120 illustrated in FIG. 1 may be wound on a single core 101 in different directions or wound in the same direction to form a coupling inductor 100.

Comparing FIGS. 2 and 3, it can be seen that the dots differ depending on the direction in which the first coil 110 and the second coil 120 are wound around the single core 101.

When the first coil 110 and the second coil 120 are wound in different directions on the single core 101 to form the coupling inductor 100 as shown in FIG. 2, the first coil 110 and the second coil ( The current flowing through 120) may flow in different directions with the single core 101 as an axis.

When the first coil 110 and the second coil 120 are wound on the single core 101 in the same direction as shown in FIG. 3 to form the coupling inductor 100, the first coil 110 and the second coil 120 ), the current flowing in the single core 101 may flow in the same direction.

At this time, the inductance generated by the coupling inductor 100 in which dots are formed in opposite directions as shown in FIG. 2 may have a smaller value than the inductance generated by the coupling inductor 100 formed in the same direction as in FIG. 3. . This is because when the dots are in the opposite direction, the magnetic flux in the single core 101 is canceled. That is, when comparing FIG. 2 and FIG. 3, there is a difference in the size of the fixed inductance by the coupling inductor 100, and the fact that the fixed inductance can be varied by the variable resistor 200 is the same.

For example, in FIG. 3, the current flowing through the coupling inductor 100 may be represented by Equation 1 below, and the voltage across the coupling inductor 100 may be represented by Equation 2 below.

[Equation 1]

In Equation 1, I ₂ is a current flowing through the second coil 120, I ₁ is a current flowing through the first coil 110, and N is a winding ratio between the first coil 110 and the second coil 120. .

[Equation 2]

In Equation 2, L _eq is an inductance generated by the coupling inductor 100, and may be calculated as in Equation 3 below, and R _eq means the resistance value of the variable resistor 200.

[Equation 3]

In Equation 3, L _m is the magnetization inductance, N is the winding ratio of the first coil 110 and the second coil 120, and R is the resistance value of the variable resistor 200.

2 and 3, the variable resistor 200 may be connected in series with the first coil 110.

When the variable resistance 200 generates a sufficiently small resistance value, for example, a resistance value close to 0, the current may be distributed and flow toward the first coil 110 and the second coil 120. In this case, the coupling inductor 100 may generate a fixed inductance.

When the variable resistance 200 generates a sufficiently large resistance value, for example, a maximum resistance value within a variable resistance range, current may flow only toward the second coil 120. In this case, the inductance by the coupling inductor 100 may have a value of a magnetization inductance by the second coil 120.

In this way, the variable resistor 200 may vary the resistance value to disperse the current flowing through the first coil 110 and the second coil 120 to vary the inductance by the coupling inductor 100. For example, when the resistance value of the variable resistor 200 increases, the inductance by the coupling inductor 100 may be increased.

As described above, the inductance variable apparatus 1000 according to an embodiment of the present invention uses a characteristic in which a current flow is distributed according to a resistance value in a parallel connection structure, and thus a desired inductance within a variable range of the inductance of the coupling inductor 100. Can generate a value. Here, the variable range of the coupling inductor 100 is between the inductance of the plurality of

coils

110 and 120 wound on the single core 101 or the magnetization inductance of either

coil

110 or 120 wound on the single core 101. It can be a range of.

Accordingly, the inductance variable device 1000 according to an embodiment of the present invention can minimize its own power consumption for variable inductance, and when applied to a power conversion system, generates an inductance that can optimize the performance of the system And continuous inductance variable.

Hereinafter, a control method of the inductance variable apparatus 1000 of the present invention will be described with reference to FIG. 4.

Referring to FIG. 4, the poor controller 300 may detect electrical parameters from the coupling inductor 100 (S10 ).

The poor controller 300 may detect a predetermined electrical parameter corresponding to an element associated with an inductance value from the coupling inductor 100. The floating controller 300 may be directly or indirectly connected to the coupling inductor 100 or directly or indirectly connected to the power conversion system to detect various electrical parameters.

The poor controller 300 may calculate an error between the detected electrical parameter and the target parameter (S20), and generate resistance value information of the variable resistor 200 using the calculated error (S30).

The poor controller 300 may receive a target parameter from the outside. For example, the target parameter may be a parameter corresponding to an element associated with an inductance value required by the power conversion system.

The sub-controller 300 sets the target parameter as a reference value, and causes the detected electrical parameter to follow the reference value, and calculates real-time errors and generates resistance value information to offset the errors.

The poor controller 300 may adjust the resistance value of the variable resistor 200 using the resistance value information (S40).

The negative controller 300 may apply a signal corresponding to the resistance value information to the variable resistor 200 to control the resistance value to generate a target inductance from the variable resistor 200. That is, the poor controller 300 may control the resistance of the variable resistor 200 by a feedback control method, thereby ultimately controlling the inductance value by the coupling inductor 100.

Although described above with reference to embodiments, those skilled in the art understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Will be able to.

[Description of codes]

1000: variable inductance

100: coupling inductor

101: single core

110: first coil

120: second coil

200: variable resistance

300: poor controller

Claims

A coupling inductor formed by winding a plurality of coils on a single core; And

The inductance variable device including a variable resistor connected to at least one coil among the plurality of coils and dispersing a current flowing through the plurality of coils according to a change in a resistance value to change an inductance by the coupling inductor.
According to claim 1,

The variable resistance,

A variable inductance device implemented as a transistor in which a resistance value between a drain electrode and a source electrode changes according to a gate voltage.
According to claim 2,

And a variable controller for generating information of the gate voltage for generating a target inductance by a feedback control method.
According to claim 1,

The coupling inductor,

The inductance variable device in which the plurality of coils are wound around the single core in the same direction, and the current flowing in the plurality of coils flows in the same direction with the single core as an axis.
According to claim 1,

The coupling inductor,

The inductance variable device in which the plurality of coils are formed by being wound on the single core in different directions, and the current flowing through the plurality of coils flows in different directions with the single core as an axis.
According to claim 1,

The variable resistance,

Variable inductance device connected in series to at least one coil of the plurality of coils.
A coupling inductor formed by winding a plurality of coils on a single core;

A variable resistor connected in series to at least one coil of the plurality of coils and dispersing a current flowing through the plurality of coils according to a change in resistance value to vary an inductance by the coupling inductor; And

A variable inductance device comprising a subtle controller that generates resistance value information of the variable resistor for generating a target inductance in a feedback control method.
In the control method of the inductance variable device capable of varying the inductance by a coupling inductor formed by winding a plurality of coils on a single core,

Detecting an electrical parameter from the coupling inductor;

Calculating an error between the electrical parameter and a target parameter;

Generating resistance value information of a variable resistor connected in series with at least one coil of the plurality of coils by using an error calculated to follow the target parameter; And

And changing the resistance value of the variable resistance by using the resistance value information so that currents flowing through the plurality of coils can be distributed by the variable resistance.