JP2001076933A - Magnetic modulation transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of circuit constituent components and make then adaptable also to high-frequency currents, without needing a separate power source for driving transistors, etc. SOLUTION: The magnetic modulation transformer comprises a first and second coils 3, 4 at one leg of a magnetic body 9, a third and fourth coils 5, 6 at the outer leg, a fifth coil 7 at a connecting part of both legs. A primary current flows in the first, second, third and fourth coils 3, 4, 5, 6 and a secondary current flows in the fifth coil 7 to thereby apply a modulation to the primary current.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic modulation transformer for modulating a primary current with a secondary current while applying a magnetic bias.

[0002]

2. Description of the Related Art A magnetic modulation transformer for modulating a primary current with a secondary current while applying a magnetic bias is used in, for example, a television receiver. When used in a television receiver, it is used for flowing a water deflection current balanced and modulated by a sawtooth wave having a vertical cycle to upper and lower coils of a horizontal deflection yoke in opposite phases. That is, as the angle of the cathode ray tube used in the television receiver increases, the color shift on the television receiving surface increases. In the case of 110 ° deflection, it is 1.5 times that in the case of 90 ° deflection.

[0003] In the case of 90 ° deflection, it is possible to devise the magnetic field distribution of a deflection coil which plays a role of creating an image on a cathode ray tube so that color shift of the entire screen can be obtained.
In the case of 0 ° deflection, color shift cannot be obtained by this method, and in particular, deterioration of color shift at four corners has become a problem.

Therefore, conventionally, a countermeasure called a differential convergence correction method (DCDD method) described below has been taken. FIG. 21 is a conventional modulation circuit diagram for differential convergence correction, FIG. 22 is a diagram showing movement on a television screen when the differential convergence correction is applied, and FIG. 23 is an upper corner of the television screen. FIG. 24 is a diagram showing the direction of the magnetic field when differential convergence is applied on the television screen.

[0005] The method shown in the modulation circuit diagram of FIG. 21 does not particularly consider the color misregistration at the four corners in designing the deflection yoke on the television screen shown in FIG.
Designed to have a barrel magnetic field.

[0008] Considering the upper corner of FIG.
As shown in FIG. 23, when a magnetic field in a direction opposite to that of the deflection yoke is applied, a red electron beam (R), a green electron beam (G), and a blue electron beam (B), which produce a color shift, are colored in red. The electron beam moves upward, the green electron beam moves downward, and the blue electron beam moves leftward. That is,
As shown in FIG. 24, the required DCDD magnetic fields at the four corners of the screen require magnetic fields that are opposite to each other, as indicated by outline arrows. Fig. 2
The circuit shown in FIG. This is a circuit in which a horizontal deflection current balance-modulated by a sawtooth wave of a vertical cycle flows in opposite phases to upper and lower coils of a horizontal deflection yoke.

FIG. 21 will be described below. The vertical period sawtooth wave is divided into the first half and the second half of the period by diodes D1 and D2, and after being amplified by TR1 and TR2,
Balance modulation is applied to the horizontal deflection current in TR3 and TR4. The parallel resonance circuits L and C resonate at a horizontal frequency, and adjust the left and right balance of the screen by changing the inductance of L. VR1 and VR2 perform upper left and right and lower left and right balance adjustment, respectively.

[0008]

However, in the conventional circuit configured as described above, the number of components constituting the circuit is increased, and a power supply for driving the transistor is required. In response to the increase in the frequency of a horizontal deflection current that requires a high resolution required for a deflection yoke for a display, which is used as a computer terminal in recent years, the transistor cannot follow up, and its characteristics cannot be sufficiently exhibited.

The present invention has been made in view of the above-mentioned conventional problems, and has a small number of components constituting a circuit, does not require a power supply for driving the circuit, and is capable of increasing the frequency of a horizontal deflection current. It is an object of the present invention to provide a magnetic modulation transformer capable of sufficiently responding.

[0010]

According to the magnetic modulation transformer of the present invention, a first coil and a second coil are provided on one leg of a substantially U-shaped magnetic body, and a third coil and a fourth coil are provided on the other leg. A coil, and a fifth coil is arranged on a trunk portion connecting the two legs, and a permanent magnet is attached to a tip of both legs, and a primary current is applied to the first coil, the second coil, the third coil, and the fourth coil, The primary side current is modulated by the secondary side current flowing through the fifth coil.

With this configuration, it is possible to realize a magnetic modulation transformer which has a small number of components constituting a circuit, does not require a power supply for driving the circuit, and can sufficiently cope with a high frequency horizontal deflection current.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is characterized in that a first coil, a second coil and a third coil and a fourth coil are provided on one leg of a substantially U-shaped magnetic material and on the other leg, respectively. And while disposing the fifth coil in the trunk part connecting these legs,
A permanent magnet is attached to the tip of both legs, a primary current flows through the first coil, the second coil, the third coil, and the fourth coil, and the primary current is modulated by a secondary current that flows through the fifth coil.

According to a second aspect of the present invention, the gap between the contact surfaces of the permanent magnet and the legs of the substantially U-shaped magnetic body can be changed.

According to a third aspect of the present invention, the permanent magnet has a substantially cylindrical shape, and the permanent magnet is rotatable.

According to a fourth aspect of the present invention, the electric wire wound around the first coil and the electric wire wound around the second coil are wound together, and the electric wire wound around the third coil and the fourth coil are wound together. The wires to be wound are wound together.

According to a fifth aspect of the present invention, the first coil comprises:
A variable resistor was connected in parallel with the second coil and in parallel with the third coil and the fourth coil.

According to a sixth aspect of the present invention, a variable resistor is added in parallel with the fifth coil.

Embodiment 1 FIG. 1 is a circuit diagram of a television receiver using a magnetic modulation transformer according to Embodiment 1 of the present invention, FIG. 2 is a structural diagram of the magnetic modulation transformer,
3 is a perspective view of the substantially U-shaped magnetic body, FIG. 4 is a cross-sectional view of the permanent magnet, FIG. 5 is a front view of the secondary coil, FIG. 6 is a front view of the same bobbin, and FIG. FIG. 8 is a front view of the coil, FIG. 8 is a diagram showing the effect of the fifth coil and the first to fourth coils due to the magnetic bias of the permanent magnet, and FIG. 9 is a diagram showing the first to fourth coils when an alternating current is applied to the fifth coil. 4 shows a change graph of inductance of a fourth coil. In the following description, the same components as those described in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

Here, 1 is a horizontal deflection coil, 2 is a vertical deflection coil, 3 is a first coil, 4 is a second coil, 5 is a third coil, 6 is a fourth coil, and a first coil 3 to a fourth coil 6. Are referred to as primary side coils. 7 is a fifth coil,
This is the secondary coil.

As shown in the circuit diagram, the first to fourth coils through which the primary current flows are connected to a horizontal deflection coil. The fifth coil 7 through which the secondary current flows
, The vertical deflection coil 2 is directly connected.

FIG. 2 is a structural diagram of the magnetic modulation transformer. Here, reference numerals from the first coil to the fifth coil are shown in FIG.
And the same reference numerals are given. Reference numeral 8 denotes a permanent magnet, and 9 denotes a substantially U-shaped magnetic body.

Hereinafter, each structure will be described. FIG. 3 shows a substantially U-shaped magnetic material made of ferrite mainly composed of Fe ₂ O ₃ . Here, reference numeral 10 denotes a magnetic body, and 1
Reference numeral 1 denotes a leg of the magnetic material, 11L denotes a left leg, 11R denotes a right leg, 12 denotes a leg end of the magnetic material, 12L denotes a left leg end, and 12R denotes a right end.

FIG. 4 shows a permanent magnet. 13 is N extreme face,
14 is an S extreme surface. That is, in order to manufacture this magnetic modulation transformer, the body 10 of a substantially U-shaped magnetic body shown in FIG.
In FIG. 5, an enamel wire 15 shown in FIG.
20 turns) Directly wound to form a secondary coil. next,
The leg portions 11L and 11R of the substantially U-shaped magnetic material are attached to the winding bobbin formed by resin molding shown in FIG.
Is wound in a predetermined number of turns (generally 50 to 100 turns), and four coils each having the coil shown in FIG. 7 are attached. Finally, the N extreme surface 13 of the permanent magnet shown in FIG. 4 is attached in contact with the leg end surfaces 12L and 12R of the substantially U-shaped magnetic body.

Hereinafter, the electrical operation of the magnetic modulation transformer having the above configuration will be described. Here, the magnetic bias by the permanent magnet is Δm, and the magnetic bias by the fifth coil 7 is Δm.
5 is assumed. Since an alternating current flows through the fifth coil 7, the direction of the magnetic bias is reversible. On the other hand, the magnetic bias Δm by the permanent magnet is always in a fixed direction.

First, when a magnetic bias is applied by the fifth coil 7 in the direction shown in FIG.
The magnetic bias applied to the magnetic core of the second coil 4
1, ψ2 is as follows.

Ψ1 = ψm-ψ5 ψ2 = ψm-ψ5 Similarly, the magnetic biases ψ3 and ψ4 applied to the magnetic cores of the third coil 5 and the fourth coil 6 are ψ3 = ψm + ψ5 ψ4 = ψm + ψ5. Here, in the formulas and formulas, since the magnetic bias ψ5 of the fifth coil 7 is subtracted from the magnetic bias ψm of the permanent magnet, the magnetic cores of ψ1 and ψ2 are not saturated. On the other hand, in the formulas and formulas, the magnetic bias ψm of the permanent magnet and the magnetic bias ψ5 of the fifth coil 7 are added.
The magnetic cores 3 and 4 are saturated when the magnetic bias of the fifth coil 7 is maximum.

Therefore, the first coil 3 and the second coil 4
Is not changed by the magnetic bias, but the self-inductance of the third coil 5 and the fourth coil 6 is changed by the change of the magnetic bias applied by the fifth coil 7.

FIG. 9 is a graph showing the change in the current flowing through the fifth coil 7 and the inductance L3 of the first coil 3 and the inductance L4 of the second coil 4 as the superposition characteristics. According to FIG. 9, when the fifth coil current approaches the (+) peak value, the inductances of L1 and L2 increase while the inductances of L3 and L4 decrease. This situation conforms to FIG. 8 and equations, equations, equations, and equations. Conversely, when the value approaches the (-) peak value, L
While the inductance of L3 and L4 increases, L1 and L2
Is reduced.

As described above, this magnetic modulation transformer can modulate the inductance of the secondary coil in accordance with the cycle of the primary coil, that is, the frequency by the current flowing through the fifth coil which is the primary current. It is.

(Embodiment 2) FIG. 10 is a structural diagram of a magnetic modulation transformer according to Embodiment 2 of the present invention, and FIG. 11 is a graph of the change in inductance. Where 16
Is a gap between the contact surfaces of the permanent magnet and the two legs of the magnetic body, and 17 is an adjusting screw as an adjusting mechanism for adjusting the gap 16. That is, in the second embodiment, the gap between the contact surfaces of the permanent magnet and the legs of the U-shaped magnetic body can be freely changed by rotating the threaded adjusting screw 17.

The effect of the gap 16 will be described below. FIG. 11 is a graph showing a change in the inductance according to the second embodiment of the present invention, which is a partial extract of FIG. In this figure, the solid line is the curve of the inductance of the coil of FIG. 9, but the curve shown by the dotted line and the dash-dot line by changing the gap between the contact surfaces of the permanent magnet and the U-shaped legs of the second embodiment. Like (increase the angle of the dotted line) or decrease (in the case of the chain line)
can do.

The angle of the slope of the curve increases or decreases the degree of modulation in the magnetic modulation transformer of the present invention. That is, by adjusting the distance of the gap 16, the modulation degree of the magnetic modulation transformer can be adjusted.

(Embodiment 3) FIG. 12 is a structural view of a magnetic modulation transformer according to Embodiment 3 of the present invention, FIG. 13 is a circuit diagram thereof, and FIG. 14 is a graph of a change in inductance. Here, reference numeral 18 denotes a substantially cylindrical permanent magnet.
The permanent magnet 18 has a rotatable structure using a square hole 19 provided at the center.

As shown in FIG. 13, the polarities of the third coil 5 and the fourth coil 6 are reversed. The operation of the magnetic modulation transformer using the rotatable permanent magnet will be described below.

FIG. 14 is a graph showing a change in inductance according to the third embodiment of the present invention, which is a partial excerpt from FIG. In FIG. 14, when is a reference curve,
Are moved substantially in parallel so that the inductance is increased. Conversely, they move substantially in parallel so that the inductance becomes low. The movement of the curve adjusts the degree of influence of the fifth coil in the present magnetic modulation transformer. That is, the bias applied to the magnetic core is adjusted.

(Embodiment 4) FIG. 15 is a structural diagram of a magnetic modulation transformer according to Embodiment 4 of the present invention, and FIG. 16 is a diagram for explaining the bifilar winding.

In the fourth embodiment, the first coil 3
And two second coils 4 are simultaneously wound. That is, the electric wire of the first coil 3 and the electric wire of the second coil 4 are bifilar wound. Similarly, the third coil 5 and the fourth coil 6 are simultaneously wound.

FIG. 16 shows this winding method. FIG. 16A shows a method using two coils used in the first embodiment, and FIG. 16B shows a bifilar winding in which two electric wires of the fourth embodiment are simultaneously wound. .

By winding this bifilar,
Not only can the winding time be significantly reduced, but also the difference in the number of turns between the two wires (eg, the wire for the first coil and the wire for the second coil) can be eliminated, as well as the stray capacitance between the two wires. Can also be.

(Embodiment 5) FIG. 17 is a circuit diagram according to Embodiment 5 of the present invention, and FIG. 18 is a graph of the change in inductance. Here, 20a and 20b are variable resistors. That is, the variable resistor 20a is connected in parallel with the first coil 3 and the second coil 4 connected in series and in parallel with the third coil 5 and the fourth coil 6 connected in series. .

In other words, the variable resistors 20a and 20b used in the fifth embodiment
Alternatively, it has a role of adjusting the current flowing through the third coil 5 and the fourth coil 6.

A description will be given below of a magnetic modulation transformer using a variable resistor connected as described above. FIG. 18 is a graph of a change in inductance according to the fifth embodiment of the present invention, which is a partial extract of FIG. In FIG. 18, assuming that is a reference curve, the curve of the inductance when the variable resistor 20a is varied can change the left half curve of the graph as shown in FIG. At this time, the right half curve of the graph does not change. Also, as shown in FIG. 18B, the curve of the inductance when the variable resistor 20b is changed can change the right half curve of the graph, and the left half curve of the graph does not change. That is, as compared with the second embodiment, the slope of the inductance curve can be adjusted independently on one side.

(Embodiment 6) FIG. 19 is a circuit diagram according to Embodiment 6 of the present invention, and FIG. 20 is a graph of the change in inductance. Here, 21 is a variable resistor. That is, the variable resistor 21 is connected in parallel with the fifth coil. In other words, the variable resistor 2 used in the sixth embodiment
1 has a role of adjusting the current flowing through the fifth coil.

A description will be given below of a magnetic modulation transformer using a variable resistor connected as described above. FIG. 20 is a graph of a change in inductance according to the sixth embodiment of the present invention, which is a partial extract of FIG. In FIG. 20, if is a reference curve, the curve of the inductance when the variable resistor 21 is varied decreases as shown in FIG. That is, the second and fourth embodiments of the present invention can be performed simultaneously.

[0045]

As described above, according to the magnetic control type transformer of the present invention, the number of components constituting the circuit is reduced, and a separate power supply for driving the transistor is not required, so that the transformer can be simplified. is there. Also, in response to the high frequency of current when used as a computer in recent years, the followability of transistors can not respond,
The problem that the characteristics cannot be sufficiently exhibited can be solved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a television receiver using a magnetic modulation transformer according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of a magnetic modulation transformer according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a substantially U-shaped magnetic body according to the first embodiment of the present invention.

FIG. 4 is a sectional view of the permanent magnet according to the first embodiment of the present invention.

FIG. 5 is a front view of a secondary coil according to the first embodiment of the present invention.

FIG. 6 is a front view of the winding bobbin according to the first embodiment of the present invention.

FIG. 7 is a front view of the coil according to the first embodiment of the present invention.

FIG. 8 is a diagram showing an influence of the fifth coil and the first to fourth coils due to the magnetic bias of the permanent magnet in the first embodiment of the present invention.

FIG. 9 is a graph showing a change in inductance of the first to fourth coils when an alternating current is applied to the fifth coil according to the first embodiment of the present invention;

FIG. 10 is a structural diagram of a magnetic modulation transformer according to a second embodiment of the present invention.

FIG. 11 is a graph showing a change in inductance according to the second embodiment of the present invention.

FIG. 12 is a structural diagram of a magnetic modulation transformer according to a third embodiment of the present invention.

FIG. 13 is a circuit diagram in Embodiment 3 of the present invention.

FIG. 14 is a graph showing a change in inductance according to the third embodiment of the present invention.

FIG. 15 is a structural diagram of a magnetic modulation transformer according to a fourth embodiment of the present invention.

FIG. 16 is a view for explaining bifilar winding in Embodiment 4 of the present invention.

FIG. 17 is a circuit diagram in Embodiment 5 of the present invention.

FIG. 18 is a graph showing a change in inductance according to the fifth embodiment of the present invention.

FIG. 19 is a circuit diagram according to Embodiment 6 of the present invention.

FIG. 20 is a graph showing a change in inductance according to the sixth embodiment of the present invention.

FIG. 21 is a diagram of a conventional modulation circuit for differential convergence correction

FIG. 22 is a diagram showing movement on a television screen when a conventional differential convergence correction is applied.

FIG. 23 is a screen diagram showing the upper corner of a conventional television screen.

FIG. 24 is a diagram showing the direction of a magnetic field when differential convergence is applied on a conventional television screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal deflection coil 2 Vertical deflection coil 3 First coil 4 Second coil 5 Third coil 6 Fourth coil 7 Fifth coil 8 Permanent magnet 9 Magnetic body 10 Body of magnetic body 11 Magnetic leg 13 N Extreme surface 14 Extreme surface 15 Enamelled wire 16 Gap 17 Adjustment screw 18 Permanent magnet

Claims (6)

[Claims] A first coil, a second coil, a third coil to a second coil, a fourth coil, and a torso portion connecting these legs to one leg of a substantially U-shaped magnetic material. Along with installing five coils, attach permanent magnets to the ends of both legs,
A magnetic modulation transformer, wherein a primary current is supplied to a first coil, a second coil, a third coil, and a fourth coil, and the primary current is modulated by a secondary current supplied to a fifth coil. 2. The magnetic modulation transformer according to claim 1, wherein a gap between contact surfaces of the permanent magnet and both legs of the substantially U-shaped magnetic body is variable. 3. The magnetic modulation transformer according to claim 1, wherein the permanent magnet has a substantially cylindrical shape, and the permanent magnet is rotatable. 4. The electric wire wound around the first coil and the electric wire wound around the second coil are wound together, and the electric wire wound around the third coil and the electric wire wound around the fourth coil are combined. The magnetic modulation transformer according to any one of claims 1 to 3, wherein the transformer is wound. 5. The magnetic modulation according to claim 1, wherein a variable resistor is connected in parallel with the first coil and the second coil and in parallel with the third coil and the fourth coil. Trance. 6. A magnetic modulation transformer according to claim 1, wherein a variable resistor is added in parallel with said fifth coil.