CN1200622A - Flyback transformer - Google Patents

Abstract

A low-voltage coil 3, serving as a primary winding, is wound around a low-voltage coil bobbin. Legs of paired cores 1 are inserted into a cylindrical hollow space of the low-voltage coil bobbin 2. A high-voltage coil 5, serving as a secondary winding, is wound around a high-voltage coil bobbin 4. The high-voltage coil bobbin 4 is coupled around the low-voltage coil bobbin 2. A ferromagnetic substance 10 is interposed between the low-voltage coil 3 and the high-voltage coil 5.

Description

Kickback transformer

The present invention relates to a kind of being used for and supply with high-tension kickback transformer to an anode of a cathode ray tube (CRT) in television receiver or computer display terminal.

In general, be used for the quite high anode voltage of the CRT needs of television receiver or display terminal with display image.Thereby CRT generally is equipped with one and is used for boosting and the kickback transformer of rectification flyback pulse, to produce such high voltage.

In the equipment of CRT was housed, current color TV set need play an AV compatible elements, was complementary with picture screen professional with the literal multiplex broadcasting and that strengthen.In addition, when CRT is used as display terminal device, need satisfy up-to-date requirement, as picture screen and the high-quality resolution that strengthens.Particularly, the requirement for the high-quality resolution rate improves day by day.

Kickback transformer has considerable influence to picture quality.Therefore, in order to satisfy above-mentioned various requirement, kickback transformer not only must produce a higher output voltage, but also must produce a bigger output current.In addition, kickback transformer must have the ability that suppresses high voltage load variations, ringing and unhelpful radiation.Particularly, ringing appears on the screen as dark bright fringes.This may damage picture quality.In addition, ringing occurs as the additional components that is included in the kickback transformer primary current.This is worthless, because coil temperature rise, and therefore reduce reliability.In order to address these problems, various measures have been taked usually.

In addition, having high performance kickback transformer can be installed in the general television receiver or display terminal.Thereby providing this high-performance kickback transformer with low cost is exactly a key factor that will realize.

Hereinafter, with reference to Figure 10 and Figure 11 structure with the interpretation routine kickback transformer.Figure 10 is a cutaway view, represents the structure of conventional kickback transformer.Figure 11 is the circuit diagram of this conventional kickback transformer.

In Figure 10, a low-voltage coil axle 2 is cylinders, is twining a low-voltage coil 3 round this cylinder, as elementary winding.Low-voltage coil axle 2 has a columniform cavity.The shank of two U-iron cores 1 inserts wherein from the two ends of this cylindrical cavity.When two iron cores 1 and low-voltage coil axle 2 are assembled together, two iron core 1 common rectangular shapes that form.

In addition, a high-tension coil axle 4 is cylinders, is twining a high-tension coil 5 round this cylinder, as secondary winding.High-tension coil 5 forms the separation solenoid of a single or multiple lift around high-tension coil axle 4.As shown in Figure 11, high-tension coil 5 is made up of a plurality of winding part 5a.When each winding part 5a was multilayer shown in Figure 10, an insulation interlayer 6 as one deck polyester film, was inserted between the adjacent layer of winding part 5a.In other words, the winding part 5a of high-tension coil 5 and insulation interlayer 6 alternately are layered on the cylinder of high-tension coil axle 4 coaxially, so that form a kind of winding construction of multilayer.

The diode 8 of each winding part 5a through inserting is connected in series, as shown in figure 11.With regard to this structure, each winding part 5a produces the in-phase voltage by diode 8 additions and rectification.As shown in figure 11, input diode 8a is connected a voltage input side (promptly at earth terminal) of high-tension coil 5.In addition, output diode 8b is connected an outlet side of high-tension coil 5.When high-tension coil axle 4 twines high-tension coil 5, the voltage input side of high-tension coil 5 is head ends of this winding.The outlet side of high-tension coil 5 is tail ends of this winding.Be preferably in the voltage input side input diode 8a is provided, because can improve high voltage adjusting characteristic and voltage wear properties (being reliability).Yet input diode 8a is selectable, and therefore can save.In Figure 10, numeral 7 expressions are used for connecting the terminal of diode 8,8a and 8b.

High-tension coil axle 4 has a cylindrical cavity, and low-voltage coil axle 2 is inserted in this cylindrical cavity.In other words, high-tension coil axle 4 connects around the outer rim of low-voltage coil axle 2, so that low-voltage coil axle 2 becomes one with high-tension coil axle 4.Low-voltage coil axle 2 that becomes one by this way and high-tension coil axle 4 are contained in the housing 9, and the cavity of housing 9 is filled with insulating resin 11, as shown in figure 10.

Explanation is used for reducing the conventional method of ringing with reference to Figure 12 to 15 from above-mentioned kickback transformer.In Figure 12 to 15, C1 represents that is connected to the capacitor on auto brightness restriction (ABL) circuit that is provided at the kickback transformer outside.C2 represents that is connected to the capacitor on the power voltage source+B that is provided at the kickback transformer outside.One end of low-voltage coil 3 is connected on power voltage source+B.The other end of low-voltage coil 3 is connected on the collector electrode of a well-known horizontal sweep level output transistor (not shown).

Figure 12 represents one first custom circuit, and this circuit comprises one by a resistor R 1 and the parallel circuits that coil L1 forms.This parallel circuits is connected on the head end of high-tension coil 5, i.e. the voltage input side of close ABL circuit.

In Figure 12, the ringing current edge is by winding part 5a → loop flow that discrete capacitor (not shown) → low-voltage coil 3 → capacitor C2 → capacitor C1 forms of parallel circuits → high-tension coil 5 of capacitor C1 → resistor R 1 and coil L1.Resistor R 1 weakens ringing current by ringing current is changed into joule's heat energy.In this case, discrete capacitor is a capacitor that is formed by the dielectric material of low-voltage coil axle 2, high-tension coil axle 4 and insulating resin 11.

Figure 13 represents second custom circuit of being made up of a resonant circuit, and resistor R 1 that this resonant circuit is connected in parallel by a coil L1 and and this coil L1 and the series circuit of a capacitor C3 are formed.This resonant circuit has a resonance frequency corresponding to ringing frequency.In Figure 13, resistor R 1 weakens ringing current by ringing current is changed into joule's heat energy.

Figure 14 represents one the 3rd custom circuit, and this circuit comprises a cylindrical resistor 12 that is inserted between low-voltage coil 3 and the high-tension coil 5.The open No.61-212008 of Japan Patent discloses the details of the 3rd custom circuit.

In Figure 14, the loop flow that ringing current is formed along the winding part 5a by winding part 5a → 12 → one discrete capacitor → high-tension coils 5 of a discrete capacitor → resistor of high-tension coil 5.Resistor 12 weakens ringing current by ringing current is changed into joule's heat energy.

Figure 15 represents one the 4th custom circuit.Positive negative pulse stuffing is created in the two ends of each winding part 5a of high-tension coil 5, although Figure 15 has only represented the impulse waveform of a winding part 5a.According to the 4th custom circuit, two conductors 13 are inserted between low-voltage coil 3 and the high-tension coil 5, are in from a positive pulse generating unit to assign to the zone of a negative pulse generation part.Provide a resistor R 1 to connect this two conductors 13.The not unexamined patent No.63-36232 of Japan's distribution discloses the details of the 4th custom circuit.

In Figure 15, resistor R 1 weakens ringing current by ringing current is changed into joule's heat energy.

Although obtained reducing the effect of ringing current, first to fourth above-mentioned custom circuit has following problem.

First custom circuit shown in Figure 12 can not be used for kickback transformer shown in Figure 11, because input diode 8a is provided at the voltage input side of high-tension coil 5.In addition, the amount of localized heat that is produced by resistor R 1 may be damaged adjacent insulating resin 11.This has just reduced reliability.Particularly, ringing current becomes big with the increase of horizontal reflection frequency.The power consumption that this has just increased resistor R 1 place further makes reliability degenerate.In addition, use coil L1 and resistor R 1 and inadvisable, because material cost increases and the operating efficiency deterioration in manufacture process.And, can not realize that the size of equipment reduces, because for resistor R 1 being installed and coil L1 must keep effective space.

The shortcoming of second custom circuit shown in Figure 13 is that the power consumption at resistor R 1 place is bigger, because reduce to appear at the ring in the high-tension coil 5 at the bigger elementary winding place of its current value.Thereby each element need have larger capacity.This has just improved cost.Reduce primary current by resistor R 1, capacitor C3 and coil L1 and may damage the high voltage adjusting characteristic.If increase the resistance value of resistor R 1, then can further increase the power consumption at resistor R 1 place.Can further worsen the high voltage adjusting characteristic.So the resistance value of resistor R 1 can not increase so bigly.Thereby, can not reduce ring effectively.

According to the 3rd custom circuit shown in Figure 14, the resistance value of resistor 12 must be on the magnitude of a few k Ω, so that ring reduces satisfactorily.Yet, be difficult to the cylindrical resistor 12 of building low-cost big resistance value, being enough to reduce ring.Thereby, can not weaken ringing fully.Produce effect of sufficient aspect weakening in ring, the open No.61-212008 of Japan Patent discloses a kind of method, and the parallel circuits of a resistor R 1 and coil L1 is provided in addition in elementary winding side.In this case, will be to have problems with the above-mentioned second custom circuit same way as.In addition, the generation of the heat at resistor 12 places will be a problem.

Similarly, the 4th custom circuit shown in Figure 15 has also run into heat and has had problems.Bonding conductor 13 and resistor R 1 are the work of a complexity.This has just increased man-hour required in the manufacture process.This structure need be improved with supports resistors R1.This has just increased entity size, has increased number of spare parts, and has therefore increased whole cost.

In view of the above problems, one object of the present invention is to provide a kind of kickback transformer, this kickback transformer can suitably weaken ringing, and cost is low, the manufacture process man-hours requirement is few, compact dimensions, temperature rise are little, high voltage adjusting characteristic and insulating capacity is good, and dependable performance.

In order to realize above and other relevant purpose, the invention provides a kind of kickback transformer that produces high pressure, this kickback transformer comprises: a low-voltage coil axle is used for twining a low-voltage coil as an elementary winding; An iron core is inserted in the low-voltage coil axle; A high-tension coil axle connects around the low-voltage coil axle, is used for twining a high-tension coil as a secondary winding; And a kind of ferromagnetic substance that is inserted between low-voltage coil and the high-tension coil.

Best, high-tension coil comprises a plurality of winding parts, the winding part insertion diode through being provided between the adjacent winding part connects, and input diode is connected to corresponding to a voltage input side of high-tension coil on the input side of one first winding part of a plurality of windings parts.

Best, the low-voltage coil axle is columniform, and ferromagnetic substance is a cylinder that has cavity, is used for surrounding the low-voltage coil that is wrapped on the low-voltage coil axle, so that do not form the closed circuit with respect to the iron core magnetic flux.

Best, the high-tension coil axle has the groove of a plurality of axially-aligned at the high-tension coil axle, and each groove extends at the circumferencial direction of high-tension coil axle, and high-tension coil is wrapped in respectively in these grooves.

Best, be formed on the ferromagnetic substance at axially extended at least one slit of iron core.

Best, at least one window is formed on the ferromagnetic substance.

Best, ferromagnetic substance is by forming to a plurality of parts of separating in iron mandrel, thereby ferromagnetic substance can not be positioned on the slit of iron core.

Connection with figures is read following detailed description, will understand above and other purpose of the present invention, feature and advantage more, in the accompanying drawings:

Fig. 1 is a cutaway view, and expression is according to a most preferred embodiment of kickback transformer of the present invention;

Fig. 2 A, 2B and 2C are perspective views, and expression is according to the primary element of kickback transformer of the present invention;

Fig. 3 is a perspective view, and expression is according to a low-voltage coil axle of kickback transformer of the present invention and the assembled state of a high-tension coil axle;

Fig. 4 A and 4B are perspective views, are illustrated in according to the various structures of ferromagnetic substance used in the kickback transformer of the present invention;

Fig. 5 A, 5B and 5C are perspective views, are illustrated in according to the various structures of ferromagnetic substance used in the kickback transformer of the present invention;

Fig. 6 A and 6B show the function that weakens according to the ringing of kickback transformer of the present invention;

Fig. 7 A to 7D is a curve chart, explains the effect according to kickback transformer of the present invention;

Fig. 8 is a cutaway view, and expression is according to another embodiment of kickback transformer of the present invention;

Fig. 9 is a cutaway view, and expression is according to another embodiment of kickback transformer of the present invention;

Figure 10 is a cutaway view, represents a kind of structure of conventional kickback transformer;

Figure 11 is the circuit diagram of conventional kickback transformer shown in Figure 10;

Figure 12 shows to have first custom circuit that ring weakens function;

Figure 13 shows to have second custom circuit that ring weakens function;

Figure 14 shows to have the 3rd custom circuit that ring weakens function; And

Figure 15 shows to have the 4th custom circuit that ring weakens function.

To explain most preferred embodiment of the present invention with reference to accompanying drawing.Parts identical in all figure are indicated with identical label.

At first, referring to figs. 1 through 3, a kind of structure of kickback transformer according to an embodiment of the invention will be explained.Circuit diagram shown in Figure 11 can be used for kickback transformer of the present invention.

In Fig. 1, a low-voltage coil axle 2 is cylinders, is twining a low-voltage coil 3 round this cylinder, as elementary winding.Low-voltage coil axle 2 has a columniform cavity 2a, shown in Fig. 2 B.The shank of two U-iron cores 1 inserts wherein from the two ends of the cylindrical cavity 2a of low-voltage coil axle 2, shown in Fig. 2 C.When two iron cores 1 and low-voltage coil axle 2 are assembled together, two iron core 1 common rectangular shapes that form.

In addition, a high-tension coil axle 4 is cylinders, is twining a high-tension coil 5 round this cylinder, as secondary winding.High-tension coil axle 4 has a columniform cavity 4a, shown in Fig. 2 A.High-tension coil 5 forms the separation solenoid of a single or multiple lift around high-tension coil axle 4.As shown in Figure 11, high-tension coil 5 is made up of a plurality of winding part 5a.When each winding part 5a was multilayer shown in Figure 10, an insulation interlayer 6 as one deck polyester film, was inserted between the adjacent layer of winding part 5a.In other words, the winding part 5a of high-tension coil 5 and insulation interlayer 6 alternately are layered on the cylindrical high-tension coil axle 4, so that form a kind of winding construction of multilayer.

The insertion diode 8 of each winding part 5a through being provided between it is connected in series, as shown in figure 11.With regard to this structure, each winding part 5a produces the in-phase voltage by diode 8 additions and rectification.As shown in figure 11, input diode 8a is connected a voltage input side (promptly at earth terminal) of high-tension coil 5.In addition, output diode 8b is connected an outlet side of high-tension coil 5.Be preferably in the voltage input side input diode 8a is provided, because can improve high voltage adjusting characteristic and voltage wear properties (being reliability).As described in following, the ring that is realized by the present invention weakens the kickback transformer that can be used for having at input side input diode 8a.In Fig. 1 and 2 A～2C, label 7 expressions are used for connecting the terminal of diode 8,8a and 8b.

After low-voltage coil 3 was wrapped on the low-voltage coil axle 2, cylindrical ferromagnetic substance 10 was also around low-voltage coil 3.High-tension coil axle 4 has a cylindrical cavity 4a.Low-voltage coil axle 2 is inserted among the cylindrical cavity 4a.That is, as shown in Figure 3,, low-voltage coil axle 2 and high-tension coil axle 4 are become one by the outer rim of high-tension coil axle 4 around low-voltage coil axle 2 connected.Obvious from Fig. 1, according to structure of the present invention, kickback transformer has the ferromagnetic substance 10 that is arranged between low-voltage coil 3 and the high-tension coil 5.

Fig. 8 represents an alternative embodiment of the invention.According to this embodiment, ferromagnetic substance 10 is arranged in the high-tension coil axle 4, to replace the ferromagnetic substance 10 around low-voltage coil axle 2.At first, ferromagnetic substance 10 along its inner cylindrical wall round high-tension coil axle 4.Then, insulation interlayer 6 as one deck polyester film, twines round ferromagnetic substance 10.After this, high-tension coil 5 twines round insulation interlayer 6.Speak briefly, the present invention proposes a ferromagnetic substance 10 and be arranged between low-voltage coil 3 and the high-tension coil 5.

By being connected the low-voltage coil axle 2 and the high-tension coil axle 4 that become one around the outer rim of low-voltage coil axle 2, high-tension coil axle 4 all is contained in the housing 9, shown in Fig. 1 and 8.The cavity of housing 9 is filled with insulating resin 11.

Each high-tension coil 5 shown in Fig. 1,8 and 11 is separated into four winding part 5a altogether.Yet the quantity of winding part 5a is not limited to disclosed quantity.Similarly, the quantity that is inserted in the insertion diode 8 between the winding part 5a is not limited to three.For example, can use four to insert diode, as shown in Figure 3.

Hereinafter will explain the detailed structure of ferromagnetic substance with reference to Fig. 4 A～4B and 5A～5C.In general, " ferromagnetism " is defined as when magnetic atom or metal free electron makes magnetic moment be arranged in same direction by its positive exchange interaction so that the magnetic that obtains when forming spontaneous magnetization.Have this ferromagnetic material and be called ferromagnetic substance.

Fig. 4 A represents to have an a kind of ferromagnetic substance 10 along the slit 10s of the axial whole extension of iron core 1, so that do not form closed circuit with respect to the magnetic flux of iron core 1.Provide slit 10s to prevent any short circuit current.With regard to this structure, an end of ferromagnetic substance cylinder 10 separates at the winding direction and the other end through slit 10s.Yet, when electric current little as to be enough to suppress can form closed circuit when heat produces.

Fig. 4 B represents to have the another kind of ferromagnetic substance 10 of the insulating part 14 of slit between the closed circle cylinder separating end.This structure does not form closed circuit with respect to magnetic flux.Yet, a kind of multilayer ferromagnetic substance 10 can be provided.Perhaps, can be reduced to about 3/4 circle to the girth of ferromagnetic substance 10.

In addition, Fig. 5 A to 5C represents the various improvement of ferromagnetic substance 10.Fig. 5 A represents a kind of ferromagnetic substance 10 that has at axially extended a plurality of slit 10s of iron core 1.In other words, form a cylinder jointly by a plurality of rectangular sheets that insert the ferromagnetic substance 10 that slit 10s separates each other.Fig. 5 B represents a kind of ferromagnetic substance 10 that has single slit 10s in the mode identical with the ferromagnetic substance 10 shown in Fig. 4 A.In addition, form a plurality of window 10w so that extending axially at iron core 1.Fig. 5 C represents a kind of ferromagnetic substance 10, and its cylinder is separated into a plurality of column parts by a slit 10g who extends at its circumferencial direction.

As Fig. 5 A to 5C, the impedance of ferromagnetic substance 10 is had significant change at improvement ferromagnetic substance 10 aspect shape, length, width, thickness or the material.Thereby, by slit 10s or window 10w or the slit 10g that a plurality of separate cylinders shown in Fig. 5 A to 5C are provided, the self-resonant frequency that can change or suitably regulate kickback transformer wittingly.This just can further improve the high voltage adjusting characteristic.

According to the structure of Fig. 5 A to 5C, by allowing magnetic flux leak the slit 1g of iron core 1, the feasible ferromagnetic substance 10 that prevents is avoided magnetization and is become possibility.Thereby, can further suppress temperature rise.

Particularly, according to the structure of Fig. 5 C, can be provided at identical height and position at cylinder on the ferromagnetic substance 10 with circumferential slit 10g between the following cylinder, as the slit 1g of iron core 1.Thereby, can arrange ferromagnetic substance 10 so that not directly facing to the slit 1g of iron core 1.

With regard to this structure, can strengthen the gap between the slit of iron core 1 1g and ferromagnetic substance 10.This heat that magnetization that suppresses by ferromagnetic substance 10 is caused produces or temperature rise is effective.

The material that resembles cobalt, nickel, iron, pure iron, silicon steel, permalloy, stainless steel and ferrite and so on can be used as ferromagnetic substance 10.General its relative permeability of ferrimagnet is bigger.For example, cobalt is 250, and nickel is 600, and iron is 5,000.Used ferromagnetic substance 10 has the relative permeability greater than 100 among the recommendable the present invention of being, more preferably greater than 200.

For example, the real material that is used for ferromagnetic substance 10 can be the iron foil that can discern from its piece number of usefulness FE-20CX that Sumitomo 3M has bought, or the perm paper tinsel that can discern from its piece number of usefulness MENPC2 that Daido Special Steel has bought.

Particularly, the iron foil with its piece number FE-20CX identification is the band that has adhesive layer in a side.This has just simplified the assembly work when being wrapped on the low-voltage coil axle 2 to iron foil, because the iron foil band can easily be pasted or remain on around the low-voltage coil axle 2 by adhesive layer.Under the condition that low-voltage coil 3 is wrapped on the low-voltage coil axle 2, can easily realize the ferromagnetic substance 10 shown in Fig. 4 A by cutting the iron foil band, so that have the length of the girth that is shorter than low-voltage coil axle 2 slightly.

Secondly, will explain that the ring that the present invention produces weakens.Fig. 6 A is a circuit diagram, represents a kind of kickback transformer that does not have input diode at the input side of high-tension coil 5.Fig. 6 B is a circuit diagram, the another kind of kickback transformer that has input diode 8a at the input side of high-tension coil 5 of expression.

In Fig. 6 A, the part ringing current is along the loop flow that winding part 5a → 10 → one discrete capacitors of a discrete capacitor → ferromagnetic substance → capacitor C2 → capacitor C1 forms by capacitor C1 → high-tension coil 5.Another part ringing current is along the winding part 5a → loop flow that discrete capacitor → low-voltage coil 3 → capacitor C2 → capacitor C1 forms by capacitor C1 → high-tension coil 5.

In Fig. 6 B, the loop flow that the part ringing current is formed along the winding part 5a by winding part 5a → 10 → one discrete capacitor → high-tension coils 5 of a discrete capacitor → ferromagnetic substance of high-tension coil 5.The loop flow that another part ringing current is formed along the winding part 5a by winding part 5a → 3 → one discrete capacitor → high-tension coils 5 of a discrete capacitor → low-voltage coil of high-tension coil 5.

By this way, ferromagnetic substance 10 is arranged in ringing current along in its closed circuit that flows.An internal driving and an external impedance of ferromagnetic substance 10 form the impedance Z by following formulate.

Z＝R+j2πfL…………………………(1)

Here " R " represents the resistance of ferromagnetic substance 10, the imaginary number that " j " representative equates with (1) 1/2, and " f " represents ringing frequency, and " L " represents the inductance of ferromagnetic substance 10, and " π " represents the girth of circle and the ratio of its diameter.

Ringing current " i " is used following formulate. $i\&Proportional;\frac{1}{R+\mathrm{<figure-callout\; id="2"\; label="j"\; filenames="A9810935000151.png"\; state="\{\{state\}\}">j</figure-callout>}2\mathrm{\&pi;fL}}----\left(2\right)$

Ringing frequency is in the magnitude of about 1MHz.According to formula (2), can be suppressed to less value to ringing current " i " by increasing impedance Z.Resistive component R by being illustrated in ferromagnetic substance 10 in the formula (1) can convert joule's heat energy to ringing current " i " to.Thereby the present invention can weaken ringing satisfactorily.This can both realize, and irrelevant with the input diode 8a that is provided at high-tension coil 5 input sides.In other words, ring of the present invention weakens the kickback transformer that can be effectively used to have at high-tension coil 5 input sides input diode 8a, and high-tension coil 5 has the feasible configurations of improving high voltage adjusting characteristic and voltage persistence (that is reliability).

Ring of the present invention weakens with above-mentioned conventional equipment to be compared, and needs a less resistor, above-mentioned conventional equipment only to rely on by convert the ring that joule's heat energy realizes to resistance and weakens.Thereby, a kind of kickback transformer that heat is few and temperature rise is little that is produced by joule's heat energy can be provided.In other words, the present invention makes the size that reduces kickback transformer become possibility, and this kickback transformer is subjected to be suppressed at temperature rise the restriction of preset range.

In addition, when input diode 8a was connected to the input side of high-tension coil 5, the approximate center of the winding part 5a of high-tension coil 5 became a neutral voltage point.This just is divided into positive pulse and negative pulse to the pulse that produces.Thereby, reduced its Equivalent Distributed electric capacity.When suppressing the high-voltage load variation, can realize high order harmonic component.In addition, the pulse peak value is reduced to a half value.This has just improved reliability.

Fig. 7 A to 7D is a curve chart, represents from the waveform of the kickback transformer actual measurement that has the input diode 8a that is connected to high-tension coil 5 input sides.Fig. 7 A represents when weaken the waveform that obtains when doing nothing (that is ferromagnetic substance 10, is not provided) for ring.Fig. 7 B represents the waveform that obtains when ferromagnetic substance 10 is the thick stainless steel foil of 0.1mm (SUS 430).Fig. 7 C represents the waveform that obtains when ferromagnetic substance 10 is the thick iron foil of 0.03mm.Fig. 7 D represents the waveform that obtains when ferromagnetic substance 10 is the thick perm paper tinsel of 0.2mm.As explaining among Fig. 4 A, ferromagnetic substance 10 has the girth that is substantially equal to a circle, between the trailing edge of the first edge of winding and winding a slit (that is, slit 10s) is arranged, thereby does not form closed circuit with respect to the magnetic flux of iron core 1.Ferromagnetic substance 10 is inserted between low-voltage coil 3 and the high-tension coil 5.

In each of Fig. 7 A to 7D, top waveform is represented an input current of low-voltage coil 3, and an ordinate is represented its current value.Following waveform is represented an inductance of high-tension coil 5, and an ordinate is represented its magnitude of voltage.In each curve chart, the abscissa express time.

More obvious between Fig. 7 A and Fig. 7 B～7D by employing ferromagnetic substance 10 between low-voltage coil 3 and high-tension coil 5, can suitably weaken ringing according to the present invention.

Although not expression, there are not other substitution of materials ferromagnetic substances 10 of ferromagnetic characteristic to carry out similar test by using, as the thick Copper Foil of 0.2mm is a kind of nonferromagnetic material, 0.3mm thick lead foil is another kind of nonferromagnetic material, 0.2mm thick phosphor bronze paper tinsel is another kind of nonferromagnetic material, the aluminium foil that 0.2mm is thick is a kind of paramagnetic substance.Under each situation, measurement result identical with shown in Fig. 7 A.In other words, do not find the effect that ringing weakens.

Understand that by above description it is effective that 10 pairs of suppressed ringing phenomenons of ferromagnetic substance are provided between low-voltage coil 3 and high-tension coil 5.

Fig. 9 represents a kind of kickback transformer in accordance with another embodiment of the present invention.Kickback transformer shown in Figure 9 is so-called part winding kickback transformer, and wherein a plurality of cylinder shape groove 4b are arranged in the axial of high-tension coil axle 4.Each groove 4b extends at the circumferencial direction of high-tension coil axle 4.High-tension coil 5 is wrapped in respectively among these cylinder shape grooves 4b.

In Fig. 9, one is inserted the pars intermedia office that diode 8 is contained in high-tension coil 5.An output diode 8b is contained in the tail end of high-tension coil 5.An input diode 8a can be provided in the head end of high-tension coil 5.

Even in this sub-coil kickback transformer,, aspect the suppressed ringing phenomenon, also can obtain the identical effect of being explained among Fig. 1 and 8 embodiment basically by between low-voltage coil 3 and high-tension coil 5, providing ferromagnetic substance 10.

As explaining in the above description, the invention provides a kind of kickback transformer, comprising: a low-voltage coil axle is used for twining a low-voltage coil as an elementary winding; An iron core is inserted in the low-voltage coil axle; A high-tension coil axle connects around the low-voltage coil axle, is used for twining a high-tension coil as a secondary winding; And a kind of ferromagnetic substance that is inserted between low-voltage coil and the high-tension coil.With regard to this structure, a kind of kickback transformer can be provided, this kickback transformer can suitably weaken ringing, and cost is low, the manufacture process man-hours requirement is few, compact dimensions, temperature rise are little, high voltage adjusting characteristic and insulating capacity is good, and dependable performance.

The present invention can implement in several modes, and does not break away from the spirit of its essential characteristic.Therefore the intention of described current all embodiment is just illustrative, and nonrestrictive, because scope of the present invention limits by the appended claims book rather than by the description before it.Therefore all fall into the border or the boundary of claims be equivalent to these borders or compass in variation all attempt to comprise by claims.

Claims (7)

1. kickback transformer that produces high pressure comprises:

A low-voltage coil axle is used for twining a low-voltage coil as an elementary winding;

An iron core is inserted in the described low-voltage coil axle;

A high-tension coil axle connects around described low-voltage coil axle, is used for twining a high-tension coil as a secondary winding;

And a kind of ferromagnetic substance that is inserted between described low-voltage coil and the described high-tension coil.

2. kickback transformer according to claim 1, wherein said high-tension coil comprises a plurality of winding parts, the winding part insertion diode through being provided between the adjacent winding part connects, and input second tube sheet is connected to corresponding to a voltage input side of described high-tension coil on the input side of one first winding part of described a plurality of winding parts.

3. kickback transformer according to claim 1, wherein said low-voltage coil axle is columniform, and ferromagnetic substance is a cylinder that has cavity, be used for surrounding the described low-voltage coil that is wrapped on the described low-voltage coil axle, so that do not form closed circuit with respect to described iron core magnetic flux.

4. kickback transformer according to claim 1, wherein said high-tension coil axle has the groove of a plurality of axially-aligned at described high-tension coil axle, each groove extends at the circumferencial direction of described high-tension coil axle, and described high-tension coil is wrapped in respectively in described a plurality of groove.

5. kickback transformer according to claim 3 wherein is formed on the described ferromagnetic substance at axially extended at least one slit of described iron core.

6. kickback transformer according to claim 3, wherein at least one window is formed on the described ferromagnetic substance.

7. kickback transformer according to claim 3, wherein said ferromagnetic substance are by forming to a plurality of parts of dividing in described iron mandrel, thereby described ferromagnetic substance is not directly faced a slit of described iron core.

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