KR20230111698A - Pulse current generating apparatus - Google Patents

Abstract

An embodiment of the present invention includes a magnetization inductor unit 20, a primary active switching unit 30, a differential coupling induction winding unit 40 wound with carbon nanotube fiber wire, a secondary switching unit 50, and a pulse current output unit 600 to convert primary side power into secondary side pulse current and output using differential coupling electromagnetic induction to which carbon nanotube fiber winding is applied, resulting in power loss in a high frequency region. A pulse current generator that minimizes is provided.

Description

Pulse current generating apparatus {Pulse current generating apparatus}

The present invention relates to a pulse current generator, and more particularly, to a pulse current generator to which a carbon nanotube fiber winding is applied, which converts a primary-side power supply into a secondary-side pulse current by using differential coupling electromagnetic induction and outputs the converted pulse current.

In general, pulsed current is widely used as semiconductor exposure, high-frequency pulse welding, high-frequency magnetic field generator, electroplating, or a system driving power source or battery charging power source of an electric vehicle.

Among them, the charging device of an electric vehicle includes a flyback transformer that simultaneously performs the functions of an inductor and a transformer by winding a switching circuit and copper, Litz cable, etc. and generates a pulse current, and charges the battery by the pulse current. Can be configured.

At this time, when the primary winding and the secondary winding are brought into close proximity to increase the coupling coefficient of the flyback transformer, a proximity effect in which magnetic resistance due to magnetic flux formed by a current flowing through an adjacent conductor increases and a skin effect in which resistance increases due to magnetic flux formed by the main current inside the conductor increases resistance and increases power loss.

When a copper wire or Litz cable is used for the winding of such a flyback transformer, the load is large and acts as an obstacle to reducing the weight of an electric vehicle, thereby limiting the improvement of the mileage compared to the charging power. In addition, in the case of metal wires such as copper or Litz cables, corrosion occurs when used for a long time, so there is a problem in that they must be replaced after a certain period of use.

In addition, when high-frequency switching is performed to increase charging efficiency, resistance also increases rapidly due to an increase in the proximity effect or skin effect of wires such as copper or Litz cable wound in the flyback transformer according to the frequency of the generated high-frequency pulse current, resulting in a large power loss.

Republic of Korea Patent Publication No. 10-2013-0088456

In order to solve the problems of the prior art described above, an embodiment of the present invention minimizes power loss at high frequency, has excellent electrical energy generation and storage efficiency, minimizes corrosion, is environmentally friendly, and when applied to an electric vehicle, etc. It is a task to solve the problem of providing a pulse current generator using carbon nanotube fiber windings that can significantly reduce power consumption by reducing load.

One embodiment of the present invention for achieving the above-described problem of the present invention is a magnetizing inductor unit for receiving power from an external power source and storing energy for generating an induced electromotive force for generating a pulse current; a primary-side active switching unit that is connected to the output terminal of the magnetization inductor and performs switching control for actively turning on or off a current path between the magnetization inductor unit and the external power source; A differential coupling induction winding unit including a primary winding unit connected in parallel with the magnetizing inductor unit and having an output terminal connected to an input terminal of the primary active switching unit at an output side of the magnetization inductor unit, and a secondary winding unit wound to form a differential coupling with the primary winding unit; and a secondary side switching unit that performs a switching operation opposite to that of the primary side active switching unit to generate a one-way pulse current at the output of the differential coupling induction winding unit and generates a pulse current at the output side of the secondary side winding unit, wherein the primary winding unit and the secondary winding unit of the differential coupling induction winding unit are wound with carbon nanotube fiber wire.

The pulse current generator may further include a pulse current output unit that is connected in series to the secondary switching unit and the secondary winding unit and outputs the generated pulse current.

The pulse current output unit includes a capacitor and a resistor connected in parallel, and an input terminal is connected to an output terminal of the secondary switching unit, and an output terminal is configured to be connected to an input terminal of the secondary winding unit.

The differential coupling induction winding unit may be formed by winding the primary winding unit and the secondary winding unit in a sandwich manner around a bobbin with an insulating layer as a medium.

In the differentially coupled induction winding unit, the secondary winding unit includes a plurality of secondary winding units, and is sequentially wound on a bobbin together with the primary winding unit through an insulating layer.

The pulse current generator of one embodiment of the present invention having the above configuration minimizes power loss at high frequency, has excellent electrical energy generation and storage efficiency, improves mechanical strength, minimizes load, minimizes the occurrence of corrosion, is environmentally friendly, and when applied to an electric vehicle, etc., provides an effect of significantly reducing power consumption by reducing load.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the configuration of the invention described in the claims.

1 shows a functional block diagram of a pulse current generator 1 according to an embodiment of the present invention.
FIG. 2 shows a circuit diagram of one embodiment of the pulse current generator 1 of FIG. 1 .
3 shows the structure and cross section of a carbon nanotube fiber used in a carbon nanotube fiber wire according to an embodiment of the present invention.
FIG. 4 shows a portion of a cross section of the differential coupling induction winding unit 40 of FIGS. 1 and 2 wound in a sandwich winding method according to an embodiment of the present invention.
5 is a view showing a twisted coupling structure of primary side windings and secondary side windings of a differential coupling induction winding unit 40 according to another embodiment of the present invention.
6 is a picture of (a) hardware setup of a proximity effect tester, (b) a 3D CAD model, (c) a two-dimensional cross-section and equivalent circuit model without a device-under-test (DUT), and (d) a two-dimensional cross-section and equivalent circuit model with a DUT, and (e) a graph showing the bandwidth of the device by comparing the impedance measurement with the model result.
7 is a graph showing a comparison of power losses according to frequency of the differential coupling induction winding unit 40 wound with carbon nanotube fiber wire and the differential coupling induction winding unit wound with copper, lead, and Litz of the pulse current generator 1 of the present invention.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

Embodiments according to the concept of the present invention can be applied with various changes and can have various forms, so specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to a specific disclosed form, and it should be understood that the present invention includes all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

It should be understood that when an element is referred to as being “connected” or “connected” to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle. Other expressions describing the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "having" are intended to specify that the described features, numbers, steps, operations, components, parts, or combinations thereof exist, but it should be understood that the presence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof is not precluded.

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

Referring to FIG. 1, in the description of the embodiment of the present invention, in the case of the primary side of the differentially coupled induction winding unit 40, the terminal to which the power supply current flowing through the magnetizing inductor unit 20 is input is designated as an input terminal, and the terminal to which the power supply current flowing through the magnetization inductor unit 20 is output is designated as an output terminal. In addition, in the case of the secondary side of the differential coupling induction winding unit 40, the terminal to which the generated pulse current is input is designated as the input terminal, and the terminal to which the pulse current is output is designated as the output terminal.

1 is a functional block diagram of a pulse current generator 1 of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the pulse current generator 1 of FIG. 1 .

1 and 2, the pulse current generator 1 according to an embodiment of the present invention may include a magnetizing inductor unit 20, a primary side active switching unit 30, a differential coupling induction winding unit 40, a secondary side switching unit 50, and a pulse current output unit 60. The pulse current generator 1 may further include a control unit (not shown) for controlling switching of the switching unit 30 or the like to generate the pulse current.

The magnetizing inductor unit 20 has an input terminal coupled to one terminal of the power supply unit 10, and an output terminal connected to the input terminal of the primary active switching unit 30 and the output terminal of the primary side winding unit 43 of the differential coupling induction winding unit 40. The magnetizing inductor unit 20 may include a magnetizing inductor L _M connected as shown in FIG. 1 .

The primary active switching unit 30 has an input terminal connected to the primary active switching unit 30 and an output terminal of the primary winding unit 43 of the differential coupled induction winding unit 40, and an output terminal connected to the negative terminal of the power supply unit 10. As described above, the connected primary side active switching unit 40 may be composed of various switching elements such as FET and MOSFET, as shown in FIG. 2 .

The first to nth secondary windings 44-1 to 44-n constituting the primary winding 43-1 constituting the primary winding 43 of the differential coupling induction winding 40 and the secondary winding 44 may be composed of a carbon nanotube fiber wire (CNTF Yarn wire) 42 having an insulated outer peripheral surface. Also, although not shown in the drawings, the primary winding unit 43 may also include a plurality of primary windings made of carbon nanotube fiber wires having different input powers.

Figure 3 is a view showing the structure of the carbon nanotube fiber wire 42 of the embodiment of the present invention.

3, (a) is a CNT (CNT filament), (b) is a part of a CNT strand, (c) is a CNT strand (CNT fiber), and (d) is a carbon nanotube fiber wire (CNTF yarn, CNT bundle). It shows a carbon nanotube fiber wire 42 made of. That is, each of the primary windings and the secondary windings constituting the primary winding part 43 and the secondary winding part 44 of the present invention are insulated on the outer circumferential surface of FIG. 3 (d). It can be composed of a carbon nanotube fiber wire.

Referring to FIGS. 1 and 2, the secondary side switching unit 50 is coupled to the secondary day output terminal side of the differential coupling guidance wire 40 to turn off when the primary active switching unit 30 is on, and when the primary active switching unit 30 is off, the power of the power of the primary side is voltly variable. At the same time, it is configured to produce and output as a pulse current. The secondary-side switching unit 50 having the above-described configuration is turned off when the primary-side active switching unit 30 is turned on and connected to be turned on when the primary-side active switching unit 30 is turned off. It may be composed of a passive switching element such as a diode (see D in FIG.

The pulse current output unit 60 has an input terminal connected to the output terminal of the secondary switching unit 50, and an output terminal connected to a terminal opposite to the terminal to which the secondary switching unit 50 of the secondary winding unit 44 is connected, and is configured to resonate with the secondary winding unit 44 to output a pulse current. To this end, as shown in FIG. 2, the pulse current output unit 60 may include a capacitor and a resistor R0 connected in parallel to the secondary winding unit 44 and the secondary switching unit 50 and connected in series.

In the above configuration, the primary and secondary windings of the differential coupling induction winding unit 40 may be wound in various winding methods to increase the coupling coefficient.

FIG. 4 shows the differentially coupled induction winding unit 40 of FIGS. 1 and 2 wound in a sandwich winding method according to another embodiment of the present invention.

The differential coupling induction winding unit 40 may include a primary winding unit 43 and a secondary winding unit 44 having an outer circumferential surface of an insulated carbon nanotube fiber wire as windings, and a bobbin (41, see FIG. 4) in which the primary winding unit 43 and the secondary winding unit 44 are wound through an insulator 45. The insulator 45 may include Teflon or the like, but is not limited thereto.

An input terminal (terminal on the power supply unit 10 side) of the primary winding 43-1 constituting the primary winding unit 43 is connected to one terminal of the power supply unit 10 (+ terminal of DC power in the case of FIG. 2) in parallel with the magnetizing inductor unit 20, and an output terminal (terminal on the primary active switching unit 30 side) of the primary winding 43-1 is connected to the magnetizing inductor unit 20 in parallel. The output terminal of the magnetizing inductor unit 20 and the input terminal of the primary-side active switching unit 30 are simultaneously connected so as to be in parallel with the turbo unit 20 and in series with the primary active switching unit 30.

As shown in FIG. 4, the differential coupling induction winding unit 40 may include a primary winding unit 43 and a secondary winding unit 44 sequentially wound around the bobbin 41 in a sandwich manner with a bobbin 41 and an insulator 45 interposed therebetween.

In the secondary winding unit 44, the secondary windings 44-1 to 44-n may be multi-wound so as to output a plurality of variable pulse currents having different voltages and currents. In this case, when one secondary winding 44-1 is wound, it may be referred to as a first secondary winding, and when n different secondary windings are wound, each of the secondary windings may be referred to as first through n-th secondary windings. Each secondary winding outputs a variable pulse current having different voltage and current values according to a winding ratio with the primary winding.

5 is a view showing a twisted coupling structure of primary side windings and secondary side windings of a differential coupling induction winding unit 40 according to another embodiment of the present invention.

As shown in FIG. 5, the primary winding 43-1 of the primary winding unit 43 and the secondary windings 44-1 to 44-n of the secondary winding unit 44 wound on the differential coupling induction winding unit 40 may be twisted and then wound in a twist manner to increase the coupling coefficient. That is, after the secondary windings 44-1 to 44-n that output a plurality of pulse currents of the secondary winding unit 44 are multi-twisted together with the primary winding unit 43-1 constituting the primary winding unit 43, and then wound simultaneously on a bobbin, each primary terminal is connected to the primary magnetizing inductor unit 20 and the primary switching unit 30, and the secondary winding Terminals of the lines may be configured to be connected to terminals of the secondary side switching unit 50 and the pulse current output unit 60 .

Due to the above-described winding method, the differential coupling induction winding unit 40 increases the coupling coefficient of the windings of the primary winding unit 43 and the secondary winding unit 44, thereby minimizing power loss and increasing efficiency.

The driving of the pulse current generator 1 of the embodiment of the present invention having the above configuration will be described with reference to FIG. 2 as follows.

First, the primary-side active switching unit 30 connected in series to the power supply unit 10 and the magnetizing inductor unit 20 is switched on. As a result, the current of the power supply unit 10 flows through the magnetizing inductor unit 20 and the primary side active switching unit 30, and energy for generating a magnetic field necessary for generating an induced electromotive force for generating a pulse current is stored in the bobbin 41 of the differential coupling induction winding unit 40 in the magnetizing inductor unit 20.

At this time, a reverse voltage is applied to the secondary side winding unit 44 of the differential coupling induction winding unit 40 by differential coupling, and the diode constituting the secondary side switching unit 50 is turned off. Accordingly, current does not flow through the primary winding unit 43 and the secondary winding unit 44 .

Next, the primary side active switching unit 30 is switched off. As a result, the current of the power supply unit 10 flowing through the magnetizing inductor unit 20 and the primary side active switching unit 30 is blocked. And, by the energy stored by the inductance stored in the magnetizing inductor part 20, the loop current flows from the magnetizing inductor part 20 through the input terminal of the primary side winding part 43, and the magnetization energy for generating the induced electromotive force is accumulated in the bobbin 41. A forward voltage based on the secondary switching unit 50 is applied to the secondary winding unit 44 so that the secondary switching unit 50 is turned on. As a result, an induced electromotive force is generated in the secondary side winding unit 44 of the differential coupling induction winding unit 40 to generate a pulse current. Then, the generated pulse current is output to the pulse current output unit 60 through the secondary side switching unit 50 . When the above-described pulse current is operated to be output at a high frequency, resonance occurs between various capacitor components and induction windings present in the circuit, so that the pulse current waveform may be transformed into a form similar to a sine wave rather than an accurate square wave. Soft switching, which is a method of reducing switching loss occurring in a switching unit, may be implemented using this characteristic.

During the above-described driving process, the differential coupling induction winding unit 40 is wound in a sandwich method as shown in FIG. 4 or in a twisted structure as shown in FIG. 5, so that the distance between the primary winding and the secondary winding becomes close. As a result, the coupling coefficient is increased to 99%, so that the voltage fluctuation efficiency can be remarkably improved.

In addition, as described above, the primary winding part 43 and the secondary winding part 44 constituting the differential coupling induction winding part 40 may be composed of carbon nanotube fiber wires.

In general, in the case of carbon nanotubes (CNTs), they have high mechanical strength, are very light (about 1/8 compared to copper), have high electrical conductivity, and can be artificially produced, so they can be controlled in price compared to metal resources such as copper, which have limited reserves.

In addition, since the carbon nanotubes themselves have lower conductivity than copper, they are not competitive when used as windings of general magnetizing elements due to large conduction loss despite the reduced skin effect.

However, the present inventors studied changes in high-frequency characteristics of copper (Cu), lead (Pb), Litz cables, and carbon nanotube wires. In the low-frequency range including direct current, copper, lead, and Litz cables had significantly lower resistance than carbon nanotube fiber wires. However, in high-frequency pulsed current, the resistance of copper, lead, and Litz cables increased, resulting in a rapid increase in power loss. On the other hand, in the case of a wire made of carbon nanotube fibers, the increase in resistance was not large, so the increase in power loss was not rapid. confirmed. Based on the above research results, the inventors of the present invention applied carbon nanotubes or wires made of carbon nanotube fibers as shown in FIGS.

In the above configuration, the differential coupling induction winding unit 40 interlocks with the magnetizing inductor unit 20, the primary side active switching unit 30, and the secondary side switching unit 50, and operates as a kind of magnetically coupled multi-winding single-core inductor in which current flows alternately between the primary side and the secondary side. That is, electrical semiconductor switches (the primary side switching unit 30 and the secondary side switching unit 50) are connected to the primary side and the secondary side, so that the current value is controlled with a pulse width. As a method of winding the winding of the differential coupling induction winding unit 40, it is typically wound in a dot direction in FIG. 2 by differential coupling. In addition, in order to increase the coupling coefficient, the primary and secondary windings are wound by layers in a sandwich method (interleaved method) or wound with primary and secondary windings of a twisted structure as shown in FIG. 5. At this time, the secondary side does not necessarily mean only one winding, and may be wound with a plurality of windings flowing current during a time when the primary winding does not conduct. If necessary, the primary winding unit may also include a plurality of primary windings.

In addition, the CNT used in the carbon nanotube fiber (CNTF) wire may be a single-walled CNT (SWCNT) as shown on the left side of FIG. 3 (a) or a double-walled CNT (MWCNT) as shown on the right side of FIG. 3 (a). The average diameter of individual CNTs may be 1.55 to 1.86 nm, preferably 1.76 nm, and the average number of walls may be 1.7 to 2, preferably 1.9. In addition, the average length of the CNTs may be 11 to 13 μm, preferably 12 μm. These CNTs are doped with chlorosulfonic acid to make individual CNTFs. Each fiber is axially aligned with high density. A portion of the cross section of these fibers is shown in Fig. 3(b). And Figure 3 (c) shows a single strand of the CNT fiber. The average diameter of these fibers may be 7 to 10 μm, preferably 8.9 μm. 3(d) shows a carbon nanotube fiber wire (CNTF yarn) made by weaving several strands of CNT fibers having a diameter of 500 to 520 μm, preferably 510 μm.

Density, linear resistance, conductivity, breaking force and strength of the carbon nanotube fiber wire made of the CNTF yarn were 1.0 g/cm ³ , 1.2 Ω/m, 2.5 Ms/m, 11 kg, and 600 MPa, respectively. The carbon nanotube fiber wire was compared with a Litz cable composed of Cu and Pb wires with a diameter of 500 μm and three strands each with a diameter of 300 μm.

Figure 6 is a proximity effect tester (a) a photograph of the hardware setup in which carbon nanotube fiber wires are wound, (b) a 3D CAD model, (c) a two-dimensional cross-section and equivalent circuit model without a test winding (70, DUT: device-under-test), (d) a two-dimensional cross-section and equivalent circuit model with a test winding 70, and (e) is a graph confirming the bandwidth of the device by comparing the impedance measurement with the model result. 7 is a graph showing a comparison of power loss according to frequency between a differential coupling induction winding unit 40 wound with carbon nanotube fiber wire and a differential coupling induction winding unit wound with copper, lead, and Litz cable of the pulse current generator 1 of the present invention. 7 is a graph comparing power loss due to proximity effect of conductors according to frequencies of copper, lead, and Litz cables and carbon nanotube fiber wires. After testing the proximity effect using FIG. 6 and performing simulations, the graphs of FIGS. 7 and 7 were derived.

The hardware-based test equipment for the proximity effect test is configured such that a white bobbin 41 manufactured by 3D printing is used to fix the position of a pair of E cores 71 and a proximity effect tester 70, as shown in (a) and (b) of FIG. After winding the test winding 73 of the material to be tested on a pair of bobbins 41, magnetic flux is applied to the pair of E cores 71 using the test windings 73 to form a uniform magnetic field in the air gap between the E cores 71. The E core 71 is preferably designed to minimize losses relative to the windings in order to detect small differences due to proximity losses in the windings. Eddy current is generated by arranging the test winding 73 and the conductor to be measured in an air gap. At this time, the loss difference generated in the winding represents the proximity loss of the test winding 73. The proximity loss is calculated from the change in loss before and after placing the test winding 73 in the air gap.

In this experiment, an impedance/gain analyzer (HP4194A) was used to measure the equivalent resistance representing the total loss of the measuring instrument. The real part of the measured impedance without test winding 73 (R ₀ (Rwinding + Rcore)) and the measured impedance with test winding 73 (R(Rwinding + Rcore + RproxDUT)) represents the total power loss of the equipment in each case. where Rwinding is the winding resistance, Rcore is the E core resistance, and RproxDUT is the proximity resistance. The test winding 73 (DUT) may be a carbon nanotube fiber wire (CNTF yarn), a Cu wire, a Pb wire, and a Litz cable.

The power loss (P _DUT ) due to the proximity effect of the test winding (73, DUT) is calculated by the following equation.

P _DUT = 1/2(RR ₀ ) ²

6, the red arrow indicates the direction of magnetic flux. The test winding 73 is indicated by an orange circle located in the center of the air gap between the E cores 71. The black winding is a copper wire with a diameter of 1 mm. As can be seen in (c) of FIG. 6, the E-core 71 operates as an external magnetic flux generator with the secondary circuit open, but in (d) of FIG. 6, the secondary circuit is the test winding 73 (DUT) RproxDUT. Equivalent circuit RLC parameters were obtained using the HP4194A Impedance/Gain Phase Analyzer. Figure 6(e) shows the impedance Bode plot of the device sketched with MATLAB software using RLC parameters and sketched with impedance/gain analyzer (HP4194A). The Bode plot shows a resonance point at 38.6 MHz well above the target frequency range. Well designed with a very high parasitic resonant frequency, it was possible to accurately measure the resistance in the target frequency range.

Input AC current values did not affect skin effect and proximity effect. Both were affected by the conductor characteristics and skin depth as a function of frequency, regardless of the magnitude of the applied current. The applied current was always fixed at 0.5A by the 4194A network analyzer.

The measurement results are shown in FIG. 7 and show the proximity power loss of wires of various materials including carbon nanotube fiber wire (CNTF yarn). The frequency range disclosed in FIG. 7 is from 1 MHz up to 10 MHz, indicating the entire high frequency region. Proximity loss of copper (Cu) wire was measured for both solid wire and litz wire with similar cross sections. In general, in the low frequency region, Cu showed superior conductivity compared to the tested carbon nanotube fiber wires (58 MS/m and 2.5 MS/m, respectively), and in the low frequency region including direct current, the Cu wire had lower proximity loss than the carbon nanotube fiber wire. However, as shown in FIG. 7, in the high frequency region of the MHz range, in both cases, the Cu wire had a higher proximity loss than the carbon nanotube fiber wire (CNTF yarn).

In addition, the conductivity of the carbon nanotube fiber wire is generally similar to that of Pb in the low frequency region. However, in the high-frequency region of the MHz range, the proximity loss of the Pb wire was higher than that of the carbon nanotube fiber wire and even the Cu wire.

The proximity effect of high-capacity macro-scale carbon nanotube fiber wire (CNTF yarn) in the frequency range of several MHz was analyzed through experiments and COMSOL simulations. The results were compared with those of Cu, Pb and Litz wires with the same cross-sectional area.

As a result of comparison, the carbon nanotube fiber wire showed a large proximity loss due to high resistance compared to Cu, Pb and Litz cables in the low frequency region including direct current, but Cu, Pb and Litz cables in the high frequency region of the MHz frequency range. It was confirmed to have much lower proximity loss than cables. Cu was found to have better conductivity (23 times higher) than carbon nanotube fiber wires. Pb wire has almost twice the conductivity of carbon nanotube fiber wire. However, the proximity loss of Pb is higher than that of Cu wire, and the proximity loss of Pb is almost 4 times higher than that of carbon nanotube fiber wire. For conventional conductors, the lower the conductivity, the greater the proximity effect.

However, in the case of the carbon nanotube fiber wire in the high frequency region, the proximity effect was lower than that of Cu, which had 23 times higher conductivity. That is, due to the characteristics of the carbon nanotube fiber wire, the proximity effect was lower than that of conventional conductors in a high-frequency region of several MHz or more.

The inventors of the present invention confirmed through the above-mentioned research that the proximity effect characteristics of the carbon nanotube fiber wire in the high frequency region are superior to those of conventional conductors. Specifically, it was confirmed that the conductivity of the macroscopic carbon nanotube fiber wire is lower than that of copper, whereas the carbon nanotube fiber wire has several advantages in the MHz frequency range. It was confirmed that the skin effect and proximity effect of the carbon nanotube fiber wire at high frequency have excellent characteristics compared to other conductors having the same conductivity. Therefore, due to these excellent high-frequency characteristics, carbon nanotube fiber wires can replace conventional metal wires.

Accordingly, the inventors of the present invention apply carbon nanotubes or carbon nanotube fiber wires to the primary and secondary windings of the differential coupling induction winding unit 40 in the pulse current generator 1 of one embodiment of the present invention having the above-described configuration.

As a result, the pulse current generator 1 of one embodiment of the present invention has a reduced effect on the skin effect or proximity effect in the MHz range high frequency region, and the electrical conductivity is significantly improved compared to copper or Litz cable. Power loss during operation of the pulse current generator 1 is minimized.

In addition, unlike corrosion of copper or Litz cable, corrosion does not occur in the case of carbon nanotube fiber wire, and mechanical properties are superior to copper or Litz cable, etc., as well as significantly light (weight is about 1/8 of copper). Maintenance time and cost can be reduced. In addition, by reducing the total load of the electric vehicle, it is possible to improve the charging power use efficiency of the rechargeable battery and the driving performance per unit power.

In addition, by replacing the Cu wire or the like with the carbon nanotube fiber wire, processes such as smelting for manufacturing the Cu wire or the like are not performed, which is environmentally friendly.

Although the technical idea of the present invention described above has been specifically described in a preferred embodiment, it should be noted that the above embodiment is for explanation and not for limitation. In addition, those of ordinary skill in the technical field of the present invention will be able to understand that various embodiments are possible within the scope of the technical spirit of the present invention. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (6)

a magnetization inductor unit receiving power from an external power supply and storing energy for generating an induced electromotive force for generating a pulse current;
a primary-side active switching unit that is connected to the output terminal of the magnetization inductor and performs switching control for actively turning on or off a current path between the magnetization inductor unit and the external power source;
A differential coupling induction winding unit including a primary winding unit connected in parallel with the magnetizing inductor unit and having an output terminal connected to an input terminal of the primary active switching unit at an output side of the magnetization inductor unit, and a secondary winding unit wound to form a differential coupling with the primary winding unit; and
A secondary-side switching unit that performs a switching operation opposite to the primary-side active switching unit to generate a one-way pulse current at the output of the differential coupling induction winding unit and generates a pulse current at the output side of the secondary-side winding unit, and outputs it,
A pulse current generator using carbon nanotube fiber winding, characterized in that the primary winding part and the secondary winding part of the differential coupling induction winding part are wound with carbon nanotube fiber wire. According to claim 1,
The pulse current generator using the carbon nanotube fiber winding, characterized in that it further comprises a pulse current output unit for outputting a pulse current generated by being connected in series to the secondary switching unit and the secondary winding unit. The method of claim 2, wherein the pulse current output unit,
Input terminals, including capacitors and resistors connected in parallel. The pulse current generator using the carbon nanotube fiber winding, characterized in that connected to the output terminal of the secondary switching unit, and the output terminal is configured to be connected to the input terminal of the secondary winding unit. The method of claim 1, wherein the differential coupling induction winding unit,
A pulse current generator using carbon nanotube fiber winding, characterized in that the primary winding part and the secondary winding part are formed by winding in a sandwich method with an insulating layer centered on a bobbin. The method of claim 1, wherein in the differential coupling induction winding unit, the secondary side winding unit,
A pulse current generating device using carbon nanotube fiber winding, characterized in that it includes a plurality of secondary windings and is sequentially wound on a bobbin together with the primary winding part through an insulating layer. The method of claim 1, wherein in the differential coupling induction winding unit,
Pulse current generator using carbon nanotube fiber winding, characterized in that the primary winding part and the secondary winding part are wound after being twisted in a twisted manner.