KR20070010253A - Non-inductive choke coil - Google Patents

Abstract

A non-inductive choke coil is provided to increase an insulation life span of a coil and to decrease a thermal loss due to an eddy current by reducing a surge and a noise. An N-inductive coil winding wire and an S-inductive coil winding wire are wound around a coreless type magnet circuit uniformly and differentially, and are connected in parallel and in series. The coreless type magnet circuit has a core type magnet circuit and a coil. The N-inductive coil winding wire is wound to induce an N-polarity. The S-inductive coil winding wire is wound to induce an S-polarity. Parallel non-inductive choke coils(43,44,45) are connected to a front end and a rear end of a load and an operational coil. A surge and a noise are reverse and offset each other when the surge and noise flow into the N-inductive coil winding wire and S-inductive winding wire of the parallel non-inductive choke coils(43,44,45). A series non-inductive choke coils(41,42) are connected to a front end and a rear end of a load and an operational coil. The N-inductive coil winding wire and S-inductive winding wire of the series non-inductive choke coils(41,42) are connected in series. A surge and a noise are reverse and offset each other by a non-inductive magnetic flux induced when the surge and noise flow along the winding wire. If the N-inductive coil winding wire and S-inductive winding wire of the non-inductive choke coils are wound differentially, and are connected in series and parallel, the non-inductive choke coils prevent a magnetic saturation and reduce a current ripple by inducing a magnet flux differentially based on a differential winding ratio.

Description

Non-inductive Choke Coil

Figure 1a is a conventional choke coil circuit for direct current,

Figure 1b is a conventional AC common choke coil circuit,

2 is a circuit diagram of a conventional surge protector for a power supply;

Figure 3a is a circuit diagram of a parallel induction choke coil configuration of the present invention;

3B is a circuit diagram of a series-connected induction choke coil of the present invention;

4A is a circuit diagram of an inverter using an induction-free choke coil of an embodiment of the present invention;

4b is a switching sequence diagram of the inverter of the present invention;

Figure 5a is a conventional full-bridge converter circuit diagram,

Figure 5b is a conventional converter switching sequence and voltage waveform diagram,

6A is a converter circuit diagram using an induction-free choke coil of another embodiment of the present invention;

6b is a switching sequence and a current / voltage waveform diagram of the present invention;

7A is an experimental diagram when a conventional surge and noise removing choke coil is used;

Figure 7b is an experimental view when using the non-induction choke coil for surge and noise removal of the present invention,

The present invention is wound around the S induction coil and the N induction coil wound so as to induce the N pole in the direction of the current flow in the magnetic circuit (Coreless Type Magnet Circuit) consisting of only a magnetic circuit conductor (Core Type Magnet Circuit) and coil It relates to an induction choke coil configured to connect surge-free choke coils consisting of induction coils with equal windings and differential windings to the front and rear ends of the functional functional coils to suppress surge and noise, and to suppress current ripple and overcurrent.

Sources of surge and noise are firstly harmonic noise caused by magnetic circuits and switching. Second, spike noise caused by switching turn-off. Third, direct lightning strike surge caused by flash and induced lightning surge. Fourth, noise due to leakage flux.

The first and second noises caused by the above causes acted as a cause of destroying the insulating film formed between the coil and the coil in the rotor and transformer magnetic circuits, and generated heat and noise in the conductor (Core) of the magnetic circuit.

The present invention firstly provides an inductance-free surge and noise filter technology by using an inductive flux induction function induced by applying an electric current by winding the N induction coil and the S induction coil of the induction choke coil evenly. By using the magnetic induction function induced by differential winding winding N- and S-guided coils of choke coils and applying a current, the current ripple is reduced by inducing high inductance without magnetic saturation even with large current. Provides technology to improve DC characteristics.

The surge and noise removal technology used up to now uses the AC current suppression property of L and the AC absorption property of C, and surges are used by using varistors to apply to more excessive characteristics. And noise were removed.

More specifically, in the DC power circuit, surge and noise are removed using L (inductance), C (capacitor) and varistor (Varistor), and external surge and noise in the single-phase AC power circuit. As a method of removing noise, a method of removing surge and noise using a common mode choke coil has been proposed, but surge and noise that can be used in three-phase and multi-phase power circuits. There was no removal technology.

In the process of rectifying a large current to reduce the current ripple, a method of increasing the inductance by using a reactor is proposed. However, when a large current flows through a reactor composed of a magnetic material, the magnetic material is saturated by the large current. Will lose its function. In order to prevent the magnetic saturation, the winding of the air core coil has to be very high, so the resistance is high, a very large space is required, and the coil length is long.

The present invention is to solve such a problem and its object is to invert and then reverse the surge (Surge) and noise (Noise) generated or intruded on a single line.

Another object of the present invention is to remove surges and noise generated by an inverter in an alternating magnetic circuit composed of three-phase and multi-phase.

Another object of the present invention is to reduce the current ripple by configuring an inductor prevented magnetic saturation in a large current DC power supply circuit.

According to an aspect of the present invention for achieving the above object, an N induction coil winding and an S pole wound so as to induce an N pole in a coreless magnet circuit consisting of only a core type magnet circuit and a coil. The S-guided coil windings wound so as to be induced are equally wound and differentially wound, and connected in parallel and in series.

Parallel induction choke coils are connected to the front and rear ends of the load and operation coils.The N-induction coil windings and S-induction coil windings of the parallel induction choke coils are connected to each other so that they are mutually reversed in the course of the surge and noise flow.

By connecting the series induction choke coil to the front and rear ends of the load and operation coil, and connecting the N induction coil winding and S induction coil winding of the series induction choke coil in series, the absence of oil induced in the process of surge and noise flowing along the winding Connect them so that they are mutually reversed by magnetic flux,

The non-inductive choke coil's N induction coil winding and S induction coil winding are differentially wound and connected in parallel and in series to apply a current to induce differential flux by the differential winding ratio to prevent magnetic saturation and reduce current ripple. A choke coil is provided.

The operation of the structure will be described as follows.

 Figure 1a is a conventional choke coil circuit diagram for DC operation is as follows.

The technique proposed as a method of removing surge and noise in a conventional DC conversion circuit includes a ripple in a charging and discharging process of a DC power supply including a ripple made by rectifying an alternating current (1) in a capacitor (2). ) And further ripple is configured to smooth the direct current in the inductive choke coil (3). This power supply circuit requires the precondition that surge and noise do not enter from the outside, and there is no alternative in case of surge and noise.

In addition, in the DC conversion circuit to which low voltage and high current are applied, smooth DC conversion is practically difficult because the capacitor 2 cannot function as a filter.

FIG. 1B is a common mode choke coil 10 mainly used in single phase alternating current. The AC power source 1 reaches the load 4 along the L1 inductive choke coil 5, and the power source Ia after operating as a load is L2. The circuit is configured to return to the AC power source 1 via the inductive choke coil 6.

COMMON MODE because the current direction of the L1 inductive choke coil 5 derived from the power source traveling to the load 4 and the current direction of the L2 inductive choke coil 6 derived from the power source returned from the load 4 are different. In the choke coil 10, induction is induced so that some noise is removed, but the surge affects the load 4. In order to solve this problem, it is a surge protector for power supply of Korea Patent Registration No. 10-0419912 by the method shown in FIG.

According to this method, the V1 varistor is connected to the front end of the L1 inductive choke coil and the rear end of the L2 inductive choke coil and the V5 varistor is connected to the front end of the L2 inductive choke coil and the rear end of the L1 inductive choke coil. Bypass some surges so as not to affect the load and connect the remaining surges (C1, C2, C3,) and varistors (V2, V3, V4,) in series, in parallel and to ground so that the surges are attenuated It was.

However, the power surge protector connects V1 varistor to the front end of L1 inductive choke coil and the rear end of L2 inductive choke coil, and bypasses V5 varistor to the front end of L2 inductive choke coil and rear end of L1 inductive choke coil. This is a circuit that does not consider power efficiency because it can cause leakage power.

Therefore, the present invention intends to provide an induction-free choke coil and an embodiment thereof as a method of removing the surge and noise as well as a method of inverting the surge and noise to be recycled as a power source.

FIG. 3A is a circuit diagram illustrating the functions of the parallel-connected induction choke coil as a surge and noise filter of the present invention, and its configuration and operation are as follows. (For convenience, an example is given for the transformer, but this also applies to the rotor.)

In the case where surge and noise invade the power source 31 from the outside due to some cause, the surge and noise removing action of the induction choke coil will be described in more detail.

When the N induction coil winding 37 and the S induction coil winding 38 are equally and differentially wound, and a phase potential power source 301 in which surge and noise invade the L1 induction choke coil 32 connected in parallel is applied, N One half of the power source 321 flows toward the induction coil 37, and one half of the power source 322 flows toward the S-induction coil 38 which is inverted and wound. At this time, the surge and noise invading the power source are also reduced to 1/2, and flow along the power source. The reduced surge and noise are mutually inverted and canceled by the magnetic flux induced by the N induction coil 37 and the S induction coil 38, and are composed of a composite power supply 323 by collecting only the power and transformer magnetic circuit 35. Induces N magnetic flux in the primary coil of and returns to the power supply stage 31 via the L2 induction choke coil 33.

The next action is to equalize and differentially wind the N induction coil winding 37 and the S induction coil winding 38 to supply a charged electric power source 302 in which surge and noise invade the L2 induction choke coil 33 connected in parallel. When applied, 1/2 of the power supply 321 flows toward the N induction coil 37, and 1/2 of the power supply 322 flows toward the S-induction coil 38 inverted and wound. At this time, the surge and noise invading the power source are also reduced to 1/2, and flow along the power source. The reduced surge and noise are mutually inverted and canceled by the magnetic flux induced by the N induction coil winding 37 and the S induction coil winding 38, and are composed of a composite power supply 333 by collecting only the power. It is configured and acts to induce the S-magnetic flux in the primary coil of 35) and return to the power stage 31 via the L1 induction choke coil (32).

The alternating magnetic flux of the primary winding thus repeatedly induced induces electromotive force in the secondary winding and operates as a load 36.

FIG. 3B is a configuration circuit diagram for explaining the function of the series-connected induction choke coil as a surge and noise filter of the present invention, and its configuration and operation are as follows. (For convenience, an example is given for the transformer, but this also applies to the rotor.)

In the case where surge and noise invade the power source 31 from the outside due to some cause, the surge and noise removing action of the induction choke coil will be described in more detail.

When the N induction coil winding 317 and the S induction coil winding 318 are uniformly and differentially wound, and a phase potential power source 301 in which surge and noise invade is applied to the L1 induction choke coil 312 connected in series. Surge and noise are mutually reversed and canceled by the induced magnetic flux in the process of applying the power source 321 including surge and noise to the induction coil winding 317 and the inverted winding S guide coil winding 318. And only the power source 323 from which the noise is removed, induces N magnetic flux in the primary coil of the transformer magnetic circuit 35 and returns to the power supply terminal 31 via the L2 induction choke coil 313.

The next action is to equalize and differentially wind the N induction coil winding 37 and the S induction coil winding 38 to supply the charged potential power 302 in which surge and noise invade the L2 induction choke coil 313 connected in series. When applied, the surge and noise are mutually reversed by the magnetic flux induced in the process of applying the power 331 including the surge and noise to the N induction coil winding 317 and the inverted winding S guide coil winding 318. Only the power source 333 which is eliminated and the surge and noise are removed is configured and acted to induce the S-magnetic flux in the primary coil of the transformer magnetic circuit 35 and return to the power supply terminal 31 via the L1 non-inductive choke coil 312. do.

The alternating magnetic flux of the primary winding repeatedly induced in this manner induces electromotive force in the secondary winding and operates as a load 36.

The advantages of induction choke coils in series and parallel connection are as follows. First, in case of differential winding, it prevents magnetic arrest and maintains high inductance and prevents overcurrent application by increasing material resistance.

Second, in the case of the equal winding, the surge and noise removal effect is large.

4 is a configuration circuit diagram showing an embodiment of a coil connection of a three-phase rotary magnetic circuit using a non-induction choke coil of the present invention and a DC power supply circuit of an inverter, the configuration and operation of which are as follows.

The operation of surge and noise by inverter switching spike in the motor and transformer magnetic circuit firstly destroys the core insulation and induces vortex to generate heat.

Second, it increases the insulation fatigue of the coil windings and shortens the life of the coil windings.

Third, it causes noise to destabilize human emotion.

Fourth, leakage magnetic flux caused by surge and noise hinder the operation of precision equipment.

Despite these problems, the reason why the surge and noise filter could not be used is because, firstly, the inductor (L) cannot be used due to the impedance increase.

Second, the capacitor C cannot be used because the circuit configuration is difficult in the coil. Third, the varistor cannot be connected to the coil because it is a resistor.

Accordingly, an object of the present invention is to provide a magnetic circuit and an inverter configured to remove surges and noise by connecting an induction choke coil of the present invention to a winding coil of a rotor and a transformer magnetic circuit.

 As shown in FIG. 4A, uninduced choke coils 43, 44, and 45 are mounted on the front and rear ends of the U coil winding 46, the V coil winding 47, and the W coil winding 48 so that surge and noise In the DC conversion circuit 40, the configuration circuit using the non-induction choke coils 41 and 42 is proposed.

The action of this circuit is that the inverter 49 operates according to the signals of the controller and the gate drive circuit, not shown, based on the switching sequence diagram of FIG. 4b to generate rotational power in the rotor magnetic circuit, and in the transformer, voltage variation. Induces the load power.

In particular, when operating a motor boosted by a transformer, the induction choke coil is an essential alternative.

FIG. 5A illustrates a conventional full-bridge converter. The configuration and operation thereof are related to the switching sequence diagram of FIG. 5B. When the switches S1 (51) and S2 (52) are simultaneously turned on and off, the waveforms of S1 and S2 (56) are shown. When the switch S3 (53), S5 (54) is simultaneously turned on and off, the waveforms S3 and S4 (57) are made. When the diode is inverted and synthesized, the DC output waveform Vo (58) is obtained.

However, these converters are mainly used in a voltage converter with a high voltage and a low current, and thus cannot be used in a converter having a low voltage and a large current. This is because there is a limit to smoothing the current ripple using a reactor.

In other words, if the reactor inductor is air-cored, the coil winding needs to be increased, so the volume is not economical, and if the inductance is increased by inserting the magnetic material into the reactor inductor, the magnetic material is saturated by the large current, but the effect is effective. There is no.

Therefore, the present invention is to provide a method of smoothing the current by preventing the magnetic saturation and increasing the inductance by adjusting the coil winding differentiation ratio of the induction choke coil.

Fig. 6A shows a configuration circuit diagram in which the inductive choke coil of the present invention is used in a large current converter, and Fig. 6B shows a switching sequence and a voltage and current waveform diagram of the large current converter.

When the coil winding differentiation ratio is adjusted to the induction choke coil of the present invention, since the impedance of the coil can be changed to change the current flow, the ripple of the current is induced because it induces a high inductance in part without adding an artificial technical control method. Ripple) can be reduced.

Looking at the configuration and operation of the large current converter of the present invention are as follows.

A direct current inductor (60) of the secondary winding is connected to an inductor (60) of a secondary winding in which the differentially wound induction choke coil and the evenly wound induction choke coil and the differentially wound induction choke coil are connected in series or in parallel according to the function. It is attached to the power output terminal to reduce the current ripple.

The effect is that when the switches S1 (61) and S2 (62) are turned on and off at the same time, the waveforms of S1 and S2 (66) are formed, and when the switches S3 (63) and S5 (64) are turned on and off at the same time, S3 and S4 (67). Waveforms are created and synthesized inverted in a diode to form a DC voltage waveform Vo (68).

 The current waveform 601 formed by the DC voltage waveform Vo 68 has a severe ripple. In order to reduce the ripple, when the inductor 60 of the induction choke coil consisting of the N induction coil winding and the S induction coil winding is attached, the high inductance of the N induction coil winding and the S induction coil winding is increased by the unwinding induction choke coil. Ripple can be reduced by changing the current flow due to the magnetic inductance and the differential winding resistance. The ripple-reduced current is stabilized through the uniformly wound induction choke coil, and the current is flowed through the differentially wound induction choke coil to suppress the smooth DC current and the overcurrent application.

This method is suitable for converters that make large currents direct current.

Fig. 7A shows a three-phase electric motor connected to Y and a conventional choke coil attached to the front of the coil winding to test the surge and noise (71) removal conditions. At this time, the motor control method was operated by PWM vector control.

Fig. 7B is a Y-phase three-phase motor and a parallel-wired induction choke coil of the present invention is attached to the front of the coil winding, and the surge and noise 72 are removed. At this time, the motor control method was operated by PWM vector control.

Under the above conditions, the results of the surge and noise elimination state of FIG. 7A are compared with those of the surge and noise elimination state of FIG. 7B. Appeared significantly.

Induction-free choke coil according to the present invention can obtain the following effects through some embodiments.

Evenly winding and applying power to the non-induction choke coil consisting of the N induction coil winding and the S induction coil winding significantly reduced the surge and noise as shown in FIG. 7B.

Surge and noise attenuation could increase the insulation life of the coil and reduce thermal losses due to eddy currents.

And when differential winding of N guide coil winding and S guide coil winding of non-induced choke coil and applying current, differential flux is induced and induced differential flux induces high inductance without self saturation, resulting in current ripple. As a result, it is effective to provide a converter with excellent economic efficiency in a superconducting energy storage device requiring a large current DC power supply.

Claims (1)

Uniform winding and differential between the N induction coil winding wound to induce the N pole and the S induction coil winding wound to induce the S pole to the coreless magnet circuit composed of a core type magnet circuit and a coil only. Winding and connected in parallel and in series, Parallel induction choke coils are connected to the front and rear ends of the load and operation coils.The N-induction coil windings and S-induction coil windings of the parallel induction choke coils are connected to each other so that they are mutually reversed in the course of the surge and noise flow. By connecting the series induction choke coil to the front and rear ends of the load and operation coil, and connecting the N induction coil winding and S induction coil winding of the series induction choke coil in series, the absence of oil induced in the process of surge and noise flowing along the winding Connect them so that they are mutually reversed by magnetic flux, The non-inductive choke coil's N induction coil winding and S induction coil winding are differentially wound and connected in parallel and in series to apply current, and the differential flux by the differential winding ratio is induced to prevent magnetic saturation and reduce the current ripple. Choke coil on the road.

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