KR20010006827A - Lighting device for discharge lamp - Google Patents

Abstract

PURPOSE: To provide an electric discharge lamp lighting device which can reduce power dissipation and can be downsized. CONSTITUTION: An electric discharge lamp lighting device 1 comprises a rectifier/filter circuit 2 for converting an AC voltage into a DC voltage, a high-frequency inverting circuit 3 for inverting the DC voltage into a high-frequency AC voltage whose frequency is higher than that of the AC voltage, a distributed constant circuit 20 having at least a transmission line 10, and a line transformer 4 for causing an electric discharge lamp 5 to light, by boosting the high-frequency AC voltage and controlling the amount of current of the high-frequency AC voltage after the lamp 5 is lit.

Description

Discharge lamp lighting device {LIGHTING DEVICE FOR DISCHARGE LAMP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device used for lighting a discharge lamp, and more particularly, to a discharge lamp lighting device including a transmission line transformer having a distribution constant circuit having a transmission line.

Discharge lamps are used as a light source for illumination, in which a small amount of gas is sealed in a vacuum glass tube and emits visible light by interaction of electrons and fraud gas emitted from an electrode formed in the glass tube.

Since a discharge lamp generates electrons at the time of lighting, it is necessary to apply a high voltage, but after lighting, discharge can be maintained at a relatively low voltage. In addition, since the discharge lamp has a negative resistance, it is necessary to limit the current after the lighting.

Therefore, in order to light such a discharge lamp, a discharge lamp lighting device capable of raising the voltage at the time of lighting of the discharge lamp, lowering the discharge holding voltage after lighting, and maintaining the current amount constant is essential.

Therefore, a discharge lamp lighting apparatus suitable for lighting the above discharge lamp will be described with reference to the drawings.

12 and 13 show an example of a conventional discharge lamp lighting apparatus.

The conventional discharge lamp lighting apparatus 200 shown in FIG. 12 is mainly composed of the rectification smoothing circuit 201, the high frequency conversion circuit 202, and the lamp lighting circuit 203. In addition, a discharge lamp 204 is connected to the lamp lighting circuit 203, and an AC power supply 205 is connected to the rectification smoothing circuit 201.

13 shows an example of a circuit configuration of this discharge lamp lighting device 200. This circuit constitutes a half bridge inverter circuit.

The rectification smoothing circuit 201 is composed of four rectifying elements D _{1 to} D ₄ and a capacitor C1. The high frequency conversion circuit 202 is composed of a control circuit 206, two transistors Tr ₁ and Tr ₂ and capacitors C ₃ and C ₄ . In addition, the lamp lighting circuit 203 includes a capacitor C ₂ connected in series with the filament of the inductor L _H and the discharge lamp 204.

A diode is used as the rectifier elements D _{1 to} D ₄ , an electrolytic capacitor is used as the capacitor C1, a choke coil is used as the inductor L _H , and a fluorescent lamp is used as the discharge lamp 204, for example. .

A fluorescent lamp discharges ultraviolet light by discharging mercury vapor sealed in a glass tube by the action of electrons, and the ultraviolet light excites a fluorescent substance applied to the inner circumferential wall of the glass tube to emit visible light.

Next, operation | movement of the discharge lamp lighting apparatus 200 is demonstrated.

The rectification smoothing circuit 201 carries out full-wave rectification of the AC voltage having a frequency of 50 kHz input from the AC power supply 205 by the rectifying elements D _{1 to} D ₄ , smoothes it by the capacitor C ₁ , and converts it into a DC voltage. .

The high frequency conversion circuit 202 converts the DC voltage converted by the rectification smoothing circuit 201 into a high frequency AC voltage of 40 to 50 kV. In the high frequency conversion circuit 202, the transistor Tr ₁ serving as a switch is turned on so that the current I ₁ flows from the rectification smoothing circuit 201. Next, Tr ₁ is turned off and Tr ₂ is turned on. The current I ₂ flows. This operation is repeated 40,000 to 50,000 times for 1 second by the control circuit 206 to generate a high frequency AC voltage of 40 to 50 mA.

In the lamp lighting circuit 203, the high frequency AC voltage generated in the high frequency conversion circuit 202 is boosted using the capacitor C2 to light the discharge lamp 204. In addition, the capacitor C2 may heat the discharge lamp 204 electrode. After the discharge lamp 204 is turned on, the amount of current applied to the discharge lamp 204 by the inductor L _H is kept low and at the same time kept constant to prevent breakage of the discharge lamp 204.

However, in the discharge lamp lighting device 200 described above, there has been a problem that the copper coil constituting the inductor L _H of the lamp lighting circuit 203 is one of the power loss sources.

In addition, since the lamp lighting circuit 203 is composed of a capacitor C ₂ for boosting a high frequency voltage and an inductor LH for controlling a current, the structure of the lamp lighting circuit 203 becomes complicated and its shape becomes larger, resulting in a discharge lamp. There was a problem that the miniaturization of the lighting device 200 could not be appreciated.

The present invention was completed to solve the above problems, and an object of the present invention is to provide a discharge lamp lighting apparatus which has a small power loss and can be miniaturized at the same time.

In order to achieve the above object, the present invention employs the following configurations.

The discharge lamp lighting apparatus of the present invention includes a rectification smoothing circuit for converting an AC voltage into a DC voltage, a high frequency conversion circuit for converting the DC voltage into a high frequency AC voltage having a frequency higher than the AC voltage, and a distribution constant circuit having a transmission line. And a transmission line transformer for boosting the high frequency AC voltage to turn on a discharge lamp and maintaining a constant current amount of the high frequency AC voltage after the discharge lamp is turned on.

Such a discharge lamp lighting device includes a transmission line transformer having a distribution constant circuit, and the boost ratio (voltage gain) of the transmission line transformer has a load of a discharge lamp connected to the inherent impedance of the distribution constant circuit and the transmission line transformer. Although it is determined by the ratio of the impedances, the load impedance of the discharge lamp before lighting is very high, a few MΩ, so when the discharge lamp is turned on, the voltage gain of the transmission line transformer becomes large, and it is possible to generate a high voltage necessary for lighting the discharge lamp.

In addition, after the lighting, the load impedance of the discharge lamp decreases and the operating voltage decreases. However, since the voltage gain of the transmission line transformer decreases with the decrease of the load impedance, the high frequency AC voltage decreases to generate a voltage necessary for maintaining the discharge of the discharge lamp. have.

In addition, since the distribution constant circuit operates as an impedance-admittance converter, the output current value of the transmission line transformer is proportional to the input voltage value. Therefore, by setting the input voltage of the transmission line transformer to a constant value, the current value of the high frequency AC voltage outputted can be kept constant.

In addition, it is possible to keep the current value of the high frequency AC voltage constant by the transmission line transformer, thus eliminating the need for the current limiting inductor, which is essential in the conventional discharge lamp lighting apparatus, and constructing the inductor of the lamp lighting circuit which is one of the power loss sources. Since the copper coil is no longer needed, the power loss can be reduced, and the discharge lamp lighting device can be miniaturized.

The discharge lamp lighting device of the present invention is the discharge lamp lighting device described above, wherein the transmission line transformer comprises a transmission core and a core having dielectric properties and magnetism.

In the transmission line transformer provided in the discharge lamp lighting device, a distribution constant circuit is composed of a transmission line and a core. The transmission line length of the transformer can be shortened as the dielectric permittivity and permeability of the core are short, so that the shape of the core is small. The reducer transformer itself can be miniaturized to achieve miniaturization of the discharge lamp lighting device.

The discharge lamp lighting device of the present invention is the discharge lamp lighting device described above, wherein the core is made of one or two or more selected from the group of Mn-Zn ferrite, Ni-Zn ferrite, and Ni-Cu ferrite.

In such a discharge lamp lighting device, the core shape of the transmission line transformer is reduced, and the discharge lamp lighting device can be miniaturized.

In addition, the core is one or two or more elements T selected from the group of Fe, Co, Ni, Hf, Zr, W, Ti, V, Nb, Mo, Cr, Mg, Mn, Al, Si, Ca, Sr, Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In, Sn, Sb, Te, Pb, Bi, one or more elements M selected from the group of rare earth elements, O, C, It consists of a soft magnetic alloy powder containing one or two or more elements D selected from the group of N and B and a synthetic resin.

According to such a discharge lamp lighting device, the permeability and permittivity of the core can be increased, the wavelength shortening effect is sufficient, the length of the transmission line is shortened, the core shape is reduced, the transformer itself is miniaturized, and the discharge lamp lighting device can be miniaturized. It becomes possible.

The discharge lamp lighting apparatus of the present invention is the discharge lamp lighting apparatus described above, wherein the effective permeability (μ) at 100 Hz of the core is 10 to 20000, and the effective dielectric constant (ε) is 10 to 5000.

According to such a discharge lamp lighting device, the permeability and permittivity of the core can be increased, the wavelength shortening effect is sufficient, the length of the transmission line is shortened, the core shape is reduced, the transformer itself is miniaturized, and the discharge lamp lighting device can be miniaturized. It becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structure of the discharge lamp lighting apparatus which is 1st Embodiment of this invention.

FIG. 2 is a circuit diagram of the discharge lamp lighting apparatus shown in FIG. 1.

3 is a perspective view illustrating a transmission line transformer provided in the discharge lamp lighting apparatus of FIG. 1.

4 is a cross-sectional view illustrating a transmission line transformer provided in the discharge lamp lighting apparatus of FIG. 1.

5 is a view for explaining a distribution constant circuit provided in the transmission line transformer.

6 is a view for explaining the step-up action of the transmission line transformer.

Fig. 7 is a cross-sectional view showing a transmission line transformer provided in the discharge lamp lighting apparatus according to the second embodiment of the present invention.

Fig. 8 is a cross-sectional view showing a transmission line transformer provided in the discharge lamp lighting apparatus according to the third embodiment of the present invention.

Fig. 9 is a cross-sectional view showing a transmission line transformer provided in the discharge lamp lighting apparatus according to the third embodiment of the present invention.

10 is a diagram showing the voltage gain and the frequency characteristics of the phase of the transmission line transformer.

11 is a diagram showing the voltage gain and phase frequency characteristics of a transmission line transformer.

It is a schematic diagram which shows the structure of the conventional discharge lamp lighting apparatus.

FIG. 13 is a circuit diagram of the discharge lamp lighting apparatus shown in FIG. 12.

* Brief description of the main parts of the drawing *

1: discharge lamp lighting device

2: rectification smoothing circuit

3: high frequency conversion circuit

4: transmission line transformer

5: discharge lamp

6: AC power

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

1-4, the discharge lamp lighting apparatus which is 1st Embodiment of this invention is shown.

The discharge lamp lighting device 1 shown in FIG. 1 is mainly composed of a rectifying smoothing circuit 2, a high frequency conversion circuit 3, and a transmission line transformer device 4 including a transmission line transformer described later. . The discharge lamp 5 is connected to the output side of the transmission line transformer 4, and the AC power supply 6 is connected to the rectification smoothing circuit 2.

FIG. 2 shows an example of a circuit configuration of the discharge lamp lighting device 1 shown in FIG. 1.

Rectifying and smoothing circuit (2) it is composed of four rectifying elements (D ₁ ~D ₄₎ and a capacitor (C _1). The high frequency conversion circuit 3 consists of a control circuit 7, two transistors Tr ₁ and Tr ₂ and capacitors C ₂ and C ₃ .

A diode is used as the rectifier elements D _{1 to} D ₄ , an electrolytic capacitor is used as the capacitor C ₁ , and a fluorescent lamp is used as the discharge lamp 5, for example.

A fluorescent lamp discharges ultraviolet light by discharging mercury vapor sealed in a glass tube by the action of electrons, and the ultraviolet light excites a fluorescent substance applied to the inner circumferential wall of the glass tube to emit visible light.

Note that the rectifying smoothing circuit 2 and the high frequency converting circuit 3 are not limited to the circuit configuration shown in Fig. 2, and conventionally known rectifying circuits, smoothing circuits, and high frequency converting circuits may be used.

As shown in Figs. 3 and 4, the transmission line transformer 23 is mainly composed of a voltage converter 20 composed of a core portion 13 and a transmission line 10. As shown in Figs. In addition, the transmission line transformer 23 may be provided with a capacitor connected in series to filaments such as a discharge, if necessary, and the transmission line transformer 4 may be provided by these capacitors, the transmission line transformer 23, or the like. It can also be configured.

As shown in FIG. 4, as shown in FIG. 4, the insulating layer 16 is formed on both surfaces of the core 14 having dielectric properties and magnetism therebetween, and the insulating layer 16 is formed again. The second adhesive layer 17 is formed on) and is comprised.

The material constituting the core 14 is preferably one or two or more selected from the group consisting of Mn-Zn ferrite, Ni-Zn ferrite, and Ni-Cu ferrite. This is because the size can be shortened and the transformer can be miniaturized.

It is preferable that the effective permeability (mu) in the core part 13 is 10-200000, and, as for the core part 13, it is preferable that the effective dielectric constant (epsilon) is 10-5000.

Since the wavelength shortening effect increases as the effective permeability (μ) and the effective dielectric constant (ε) increase, the transmission line transformer 23 can be miniaturized. However, since the intrinsic impedance of the transmission line 10 becomes higher as the effective permeability (μ) is larger, as the effective dielectric constant (ε) is larger, there is a suitable range for μ and ε. Therefore, in the present invention, in order to increase the wavelength shortening effect and set the intrinsic impedance to a predetermined value, it is preferable that µ and ε are within the above ranges.

Polyimide etc. are used as a material which comprises the insulating layer 16. As shown in FIG.

The transmission line 10 consists of a pair of line conductors 11 and 12, and these pairs of line conductors 11 and 12 are respectively wound in a spiral around the core portion 13 and wound at the same time. It is wound so as to be opposite to each other. In addition, each of the line conductors 11 and 12 has a magnetic flux in which the current flowing through the conductor on one face side of the core portion 13 and the conductor on the other face side is reversed (the current direction is opposite from the front and back of the core portion). It is structured to strengthen. In this transmission line transformer 23, one of the line conductors 11 and the other of the line conductors 12 is configured such that the magnetic flux is directed in the direction of the arrow MF in the core portion 13.

Arrow directions indicated by symbols I _a and I _b in the figure are directions of magnetic fluxes generated by currents flowing through the respective line conductors 11 and 12.

In this way, the voltage conversion part 20 is comprised by the transmission line 10 and the core 14, and this voltage conversion part 20 is comprised so that it may operate as a distribution constant circuit.

As a method of forming the transmission line 10 around the core 14, for example, a general coated copper wire is wound, a conductor is formed on the insulating layer 16 by plating or sputtering, or an adhesive layer 15, an insulating layer ( 16), the second adhesive layer 17 and the transmission line 10 formed integrally can be formed by a method such as processing in a belt shape and arranged on both sides of the core 14 in a predetermined shape.

A discharge lamp 5 is connected to the terminals 11a and 12a of the output side (receive end side) of each of the line conductors 11 and 12, and a high frequency conversion circuit 3 is connected to the terminals 11b and 12b of the input side (transmission end side). Is connected.

The line length D of each of the line conductors 11 and 12 (transmission line 10) is approximately equal to 1/4 wavelength of the high frequency AC voltage frequency (operating frequency) applied to these line conductors 11 and 12. desirable.

If the line length D is different from 1/4 wavelength of the high frequency AC voltage frequency (operating frequency), the impedance conversion and the voltage when the discharge lamp 5 having a load impedance larger than the intrinsic impedance of the voltage conversion section 20 are connected. This is not preferable because no conversion is performed.

It is preferable to use the discharge lamp 5 having an impedance different from the intrinsic impedance of the voltage converter 20 having the above-described configuration, because the discharge lamp 5 has a characteristic with the intrinsic impedance of the voltage converter 20 at both ends of the load. This is because a voltage different from the input voltage (high frequency AC voltage) of the transformer 23 is applied at a magnification according to the ratio. In addition, it is preferable to use the discharge lamp 5 having an impedance larger than the intrinsic impedance of the voltage converter 20, because the ratio of the discharge lamp 5 to the intrinsic impedance of the voltage converter 20 at both ends of the discharge lamp 5. This is because a voltage higher than the input voltage (high frequency AC voltage) of the transformer 23 is applied at a magnification according to the present invention.

In particular, when the fluorescent lamp is used as the discharge lamp 5, the load impedance before the fluorescent lamp is turned on is very high at several MΩ, the ratio with the intrinsic impedance of the distribution constant circuit is increased, and the boost ratio (voltage gain) of the transmission line transformer 4 is increased. ) Can be increased to generate the high voltage required to turn on the fluorescent lamp.

Next, operation | movement of this discharge lamp lighting apparatus 1 is demonstrated.

Rectifying and smoothing circuit (2) converts the DC voltage smoothed by the full-wave rectification and the capacitor (C ₁₎ by an AC voltage of a commercial frequency input from the AC power supply 6 to the rectifying elements (D ₁ ~D _4).

The high frequency conversion circuit 3 converts the DC voltage converted by the rectification smoothing circuit 2 into a high frequency AC voltage of 40 to 50 kV. In the high frequency conversion circuit 3, the transistor Tr ₁ serving as a switch is turned on so that the current I ₁ flows from the rectification smoothing circuit 2. Next, Tr ₁ is turned off and Tr ₂ is turned on. Current I ₂ flows. This operation is repeated 40,000 to 50,000 times for 1 second by the control circuit 7 to generate a high frequency AC voltage of 40 to 50 kV.

In the transmission line transformer 4, the discharge lamp 5 is turned on by boosting the high frequency AC voltage generated by the high frequency converter circuit 3. After the discharge lamp 5 is turned on, the output current from the transformer is kept constant as necessary to prevent breakage of the discharge lamp 5.

Next, the operation of the transmission line transformer 23 will be described in more detail.

In the above-described transmission line transformer 23, a distribution constant circuit as shown in Fig. 5, which comprises a core 14 and a transmission line 10 having parasitic capacitance (distribution constant) to a circuit constant and having dielectric and magnetic properties, Consists of.

In Fig. 5, reference symbol V _in denotes an input voltage of the transformer 23 (high frequency alternating voltage), V _out denotes an output voltage of the transformer 23, I _in denotes an input current of the transformer 23 (current value of a high frequency alternating voltage), I _out is the output current of the transformer, Z _in is the input impedance of the transformer 23, Z _out is the impedance seen from the output side of the transformer 23, and Z _c is a distribution constant composed of the transmission line 10 and the core 14. The natural impedance, D, of the circuit is the line length of the transmission line 10.

The distribution constant circuit shown in Fig. 5 is represented by the following equation (1).

In the formula (1), β is the propagation constant of the transmission line 10 (β = 2πf / v = 2π / λ · (1-a) equation). In the formula (1-a), v is the propagation speed (= fλ) and λ is the radio wave wavelength.

In the present embodiment, when the line length D of the transmission line 10 is λ / 4 of a predetermined frequency,

βL = (2π / λ) × (λ / 4) = π / 2

Becomes

Therefore, Formula (1) can be represented by following formula (2).

By modifying Equation (2) above to obtain the input impedance Z _in of the transformer 23,

Z _in = V _in / I _in

_{= (JZ c · I out)} / ((j / Z c) · V out) ··· (3)

Where V _out = Z _{outI out}

Z _in = Z _c / (Z _out / Z _c ) = Z _c ² / Z _out ... (4)

This means that when a wave length / 4 = line length D is connected to a load having an impedance of 100 ohms to an output terminal of a line having a natural impedance Z _c of 50 ohms, the impedance of the load is viewed from the input side. It shows what looks like 25 ohms, (A) The load impedance Z _L connected to the output side seems to have been converted into Z _in from the input side. Therefore, impedance conversion is achieved.

Moreover, from said formula (2)

V _in = I _out jZ _c ·

I _in = (j / Z _c ) V _out (5)

From the above, it can be seen that the input voltage V _in of the transformer 23 (B) is proportional to the output current I _out , and the input current I _in is proportional to the output voltage V _out .

Only when each line length D is a radio wave wavelength / 4, the relationship of (A) and (B) is established and voltage conversion is performed.

In this way, the boosting ratio (voltage gain) of the transmission line transformer 23 is determined by the ratio between the natural impedance Z _c of the distribution constant circuit and the load impedance Z _L of the discharge lamp 5. The type transformer 23 is suitable for the impedance characteristic of the discharge lamp 5 which exhibits a high load impedance at start-up requiring a high voltage and shows a low load impedance after lighting.

Next, the boosting action of the transmission line transformer 23 will be described in more detail. 6 is a graph for explaining the step-up action of the transmission line 10 of the transmission line transformer 23. In the graph of FIG. 6, the horizontal axis represents the ratio of the load impedance Z _L and the natural impedance Z _c .

Here, it is assumed that the input voltage V _in of the transformer 23 is a constant voltage.

When the load impedance (Z _L ) is equal to the intrinsic impedance (Z _c ) (Z _L / Z _c = 1), the distribution constant circuit is in a matching state, and the voltage at the input side and output side as indicated by the point A in the figure Is obviously the same.

When the discharge lamp 5 with Z _L > Z _c is connected (Z _L / Z _c > 1), Z _in <Z _c from the above formula (4), and the input current I _in increases. In addition, since the output voltage (V _out ) is proportional to the input voltage (I _in ) from the above equation (5), the output voltage (V _out ) increases as shown by the point B in the figure.

Therefore, in the region where Z _L > Z _c , V _out becomes greater than V _in , resulting in a boost. Therefore, when the discharge lamp 5 showing the load impedance larger than the intrinsic impedance Z _c of the distribution constant circuit is connected as the load of the line whose line length D is 1/4 wavelength of the operating frequency, the discharge lamp 5 At both ends, an output voltage V _out higher than the input voltage V _in2 may be applied at a magnification according to the ratio of the intrinsic impedance Z _c to light the discharge lamp 5.

After the discharge lamp 5 is turned on, the load impedance Z _L of the discharge lamp 5 decreases and the operating voltage decreases. However, the boosting ratio of the transmission line transformer 23 follows the decrease of the load impedance Z _L. Since the output voltage V _out of the transformer is lowered, the lighting of the discharge lamp 5 can be kept stable.

In addition, as described above, the discharge lamp 5 must apply a high voltage to generate electrons at the time of lighting, but can maintain the discharge at a relatively low voltage after lighting. In addition, since the discharge lamp 5 has a negative resistance, it is necessary to limit the current after the lighting.

Since the distribution constant circuit operates as an impedance-admittance converter, the output current value of the transmission line transformer 23 is proportional to the input voltage value. Therefore, by setting the input voltage of the transmission line transformer 23 to a constant value, the current value of the high frequency AC voltage outputted can be kept constant.

In this way, since the amount of current supplied to the discharge lamp 5 can be kept constant by the transmission line transformer 23, the current limiting inductor, which is essential in the conventional discharge lamp lighting apparatus, is unnecessary and the lamp which is one of the current loss sources. The copper coil of the inductor constituting the lighting circuit is not necessary, thereby reducing the power loss.

Next, the reason why the wavelength can be shortened by using the core 14 described above in this transmission line transformer 23 and the transmission line transformer 23 can be reduced will be described.

The wavelength in free space is represented by the following formula (6).

λ = v / f (6)

If the permittivity and permeability of the portion where the electric field of the voltage conversion section 20 is generated is large, the propagation speed v of the traveling wave becomes slow. This propagation speed v is represented by the following formula (7).

v [m / s] = 3 × 10 ⁸ × (ε ^1/2 · μ ^1/2 ) ^-1 (7)

Therefore, the wavelength in that case is represented by following formula (8).

λ = (v / f) · (ε ^1/2 · μ ^1/2 ) ^-1 ... (8)

As can be seen from Equation (8), wavelength shortening occurs according to the values of permittivity and permeability. That is, when the permittivity and permeability increase, the wavelength is shortened accordingly, and the core 14 is made of a material having a high permittivity and permeability, so that the wavelength can be shortened, the core dimension can be shortened, and the transmission line transformer ( 23) The size of the discharge lamp lighting device 1 can be reduced by itself.

In the transmission line transformer 23 described above, one or two or more elements T selected from the group of Fe, Co, and Ni, and Hf, Zr, W, Ti, V, and Nb as materials constituting the core 14 From Mo, Cr, Mg, Mn, Al, Si, Ca, Sr, Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In, Sn, Sb, Te, Pb, Bi, rare earth elements The use of a soft magnetic alloy powder and a synthetic resin comprising one or two or more selected elements M, and one or two or more selected elements D selected from the group of O, C, N, and B uses the core 14 The magnetic permeability and dielectric constant can be increased, the wavelength shortening effect can be sufficient, and the transmission line transformer 23 itself can be miniaturized, so that the miniaturization of the discharge lamp lighting device 1 can be achieved.

As said soft magnetic alloy powder, what is shown, for example by the following composition formulas is used preferably.

T _a M _b D

(In the above formula, T represents one or two or more elements selected from the group of Fe, Co, Ni, and M represents Hf, Zr, W, Ti, V, Nb, Mo, Cr, Mg, Mn, Al, Si, Ca, Sr, Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In, Sn, Sb, Te, Pb, Bi, represents one or two or more elements selected from the group of rare earth elements, D represents one or two or more elements selected from the group of O, C, N, and B. In addition, a, b, and c, which represent the composition ratio in the composition formula, are 40% a <87, 0 <b ≤ 20 in atomic%. , 0 <c ≤ 50 is satisfied.)

As the synthetic resin, a material having a low dielectric loss (ie, a material having a large Q and having a Q of 400 or more) is used. For example, polypropylene, polyethylene, polystyrene, paraffin, polytetrafluoroethylene, polycarbonate, silicone resin, or the like is used. Can be mentioned.

The core 14 made of the soft magnetic alloy powder and the synthetic resin as described above can be produced, for example, by the following method.

First, each raw material is weighed so that a composition formula may be a composition of the soft magnetic alloy powder represented by T _a M _b D _c . As a raw material here, the powder of T and the powder of M are used. As the powder of T, a powder selected from the group consisting of one or more elements selected from the group of Fe, Co, and Ni, oxides, carbides, carbonates, nitrides and borides is used. Powders of M include Hf, Zr, W, Ti, V, Nb, Mo, Cr, Mg, Mn, Al, Si, Ca, Sr, Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In And powders selected from the group consisting of one or more elements selected from the group consisting of Sn, Sb, Te, Pb, Bi, and rare earth elements, oxides, carbides, carbonates, nitrides and borides. Examples of the rare earth elements include Lanthanoids such as Sc, Y, or La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Td, Dy, Ho, Er, Tm, Yb, Lu, etc. belonging to group 3A of the periodic table. One or more types of elements or their mixtures chosen from the group can be mentioned.

At this time, it is preferable that the powder of T is 100 micrometers or less, and the powder of M is 2 micrometers or less.

Subsequently, in the case of adding O, C, or N out of D, the above-described powder of T and M powder are sealed together with a stainless ball of the same material as the pot in a pot made of stainless steel, and the group of O, C, N The gas of D selected from a single gas, an oxide gas, and a carbide gas of at least one element selected from the above is filled. In addition, a soft magnetic alloy powder in which the composition formula is represented by T _a M _b D _c can be obtained by mechanical alloying which is pulverized and stirred for a predetermined time using a high energy type planetary ball mill.

The mechanical pulling time is preferably 2 hours or more in terms of being able to sufficiently refine the crystal of the bcc structure or the fcc structure, or the T in which they are mixed.

The soft magnetic alloy powder obtained here has an average particle diameter of about 1 to 2 µm having a structure in which the microcrystalline phase of T having a bcc structure in the order of several nm to several 10 nm is surrounded by an amorphous phase containing a large amount of M and D. Phosphorus aggregated particles. This soft magnetic alloy powder exhibits excellent soft magnetic properties because the average particle diameter of the bcc structure or fcc structure constituting the aggregated particles or the microcrystals of T in which they are mixed is fine, and the bcc structure or fcc structure or T in which these are mixed Since the microcrystals are surrounded by a high resistance amorphous phase, the eddy current loss can be suppressed to be small.

Next, the obtained soft magnetic alloy powder is dispersed in a synthetic resin liquid containing an organic solvent as a solvent to obtain a slurry, and the slurry is repeatedly passed through three rolls, and kneaded until the slurry becomes powder. Get Xylene, toluene, benzene, etc. are mentioned as an organic solvent which melt | dissolves this synthetic resin.

Although the ratio which adds a soft magnetic alloy powder to synthetic resin can be suitably changed with the magnetism and dielectric property of the target core, it is preferable to add so that it may become about 50-80 vol% by the volume ratio in a slurry.

If the volume ratio of the soft magnetic alloy powder is less than 50 vol%, the permeability may be lowered. On the other hand, if it is more than 80 vol%, there may be a problem that it is difficult to mold by injection molding or the like.

The soft magnetic alloy powder is preferably heat-treated in an atmosphere selected from air, oxygen, nitrogen, water vapor, or a mixed atmosphere thereof before dispersing and kneading the synthetic resin liquid. As for the heating temperature here, about 25 degreeC-about 300 degreeC, and as for heating time, 0.5 hour-about 48 hours are preferable. In this case, since an insulating layer made of an oxide is formed on the surface of the soft magnetic alloy powder, the resistivity of the soft magnetic alloy powder is increased, and the dielectric constant at high frequency can be lowered. In addition, the insulating layer here may be formed using not only an oxide film but another insulating film.

Subsequently, the kneaded product is put into a dryer or the like, heated to evaporate the organic solvent, and then molded into a desired shape using a press molding machine, an injection molding machine, an extrusion apparatus, or the like to produce a molded body. Subsequently, the core 14 having the target magnetic properties and dielectric properties can be obtained by heating the molded product at about 150 to 400 ° C. for about 1 hour.

The core 14 made of the soft magnetic alloy powder and the synthetic resin is mixed with the powder of T and the powder of M, and then pulverized and stirred in the gas atmosphere of D, instead of the powder of T, the powder of M, and the powder of D. The above-mentioned preparation except for mixing and pulverizing the powder in an inert gas atmosphere or in a gas atmosphere of D selected from the group gas, oxide gas and carbide gas of at least one element selected from the group of O, C, and N. It can also manufacture by the method similar to an example.

As the powder of D, one or more or a mixture selected from carbon and B is used.

In this example, the pulverization and stirring of the powder of T, the powder of M and the powder of D are carried out under a gas atmosphere of D, or under an inert gas atmosphere such as Ar gas, or an inert gas such as gas of D and Ar gas. In the mixed gas atmosphere mixed with the above, in the mixed gas atmosphere, the amount of oxygen, carbon and nitrogen in the material can be adjusted.

The core 14 made of the soft magnetic alloy powder and the synthetic resin is the same as in the manufacturing example described above except that the powder of TM alloy thin ribbon obtained by the liquid quenching method is used instead of the powder of T and the powder of M. It can also manufacture by a method.

In addition, the core 14 made of a soft magnetic alloy powder and a synthetic resin is a powder of a TM alloy thin ribbon obtained by a liquid quenching method in addition to the powder of T, the powder of M, the powder of D and / or the gas of D. It can also manufacture similarly to the manufacturing example mentioned above except using also.

Next, a second embodiment of the present invention will be described. 7 shows a discharge lamp lighting apparatus according to a second embodiment of the present invention.

The part where this discharge lamp lighting device 21 differs from the discharge lamp lighting device 1 shown in FIGS. 1-4 is that a structure of a transmission line type | mold transformer differs.

That is, in the transmission line transformer 22 provided in the discharge lamp lighting device 21, a spiral line conductor 41 is formed on one surface of the plate-shaped core 44 having dielectric properties and magnetism, and the other of the core 44 is formed. The ground conductor 42 is formed in the surface.

The transmission line 45 is constituted by the line conductor 41 and the ground conductor 42.

The core 44 is made of the same material as the core 14 of the transmission line transformer 23 shown in Figs. 3 and 4 described above.

The core 44 and the transmission line 45 constitute a voltage conversion section 46 (distribution constant circuit).

The ground conductor 42 is a thin film formed on the entire other surface of the core 44, but may be formed in a coil shape without being limited to the thin film.

The discharge lamp 5 is connected to the output side terminal 41a of the line conductor 41, and the high frequency conversion circuit 3 is connected to the input side terminal 41b. A discharge lamp 5 is connected to the output terminal of the ground conductor 42, and a high frequency conversion circuit 3 is connected to the input terminal.

In the discharge lamp lighting apparatus 21 of the above-mentioned structure, the effect described below can be acquired in addition to the effect of the discharge lamp lighting apparatus 1 shown to FIGS. That is, since the transmission line transformer 22 is composed of the core 44 and the transmission line 45 formed on one side and the other side of the core 44, the inductance of the transmission line 45 can be increased. And the capacitance can be raised. In this way, miniaturization of the transmission line transformer 22 is achieved.

Next, a third embodiment of the present invention will be described. 8 and 9 show a discharge lamp lighting device according to a third embodiment of the present invention.

The part where this discharge lamp lighting device 30 differs from the discharge lamp lighting device 1 shown in FIGS. 1 to 4 is that the configuration of the transmission line transformer is different.

In other words, in the transmission line transformer 31 provided in the discharge lamp lighting device 30, the spiral transmission line 51 is sandwiched between the pair of core bodies 54a and 54b constituting the core 54, and again. The ground conductors 52, 52 are formed outside the pair of core halves 54a, 54b.

The core 54 is made of the same material as the core 14 of the transmission line transformer 23 shown in Figs. 3 and 4 described above.

The core 54 and the transmission line 51 form a voltage converter 32 (distribution constant circuit).

The grounding conductors 52 and 52 are formed in each surface on the opposite side to each abutting surface of the pair of core halves 54a and 54b, respectively. The ground conductors 52, 52 are formed on the front surface of the core half body 54a, 54b on the opposite side of each abutting surface by using the adhesive layers 101, 102, but are formed in a coil shape without being formed on the front surface. It may be.

8 and 9, a central convex portion 54c is formed in the center of the contact surface 54f of the core half body 54a, and a part of the peripheral portion 54d of the contact surface 54f is provided. Peripheral convex parts 54e and 54e are formed. The peripheral convex parts 54e and 54e are formed facing each other on the contact surface 54f.

In addition, the core half body 54b has a plate shape.

The center convex portion 54c and the peripheral convex portions 54e and 54c of the core half body 54a are engaged with the core half body 54b to form the core 54 and at the same time inside the core 54. The cavity portion 7a is formed by being divided into a pair of core halves 54a and 54b, the central convex portion 54c and the peripheral convex portions 54e and 54e, and the pores 7a form the pores 7a. ) Is configured.

And a pair of core half body 54a, 54b, the center convex part 54c, and the periphery convex part 54e, 54e comprise the path | route which surrounds the path | route formation part 7.

Next, as shown in FIG. 8 and FIG. 9, the transmission line 51 consists of a conductor, is wound around the central convex part 54c, is spaced apart from the core half body 54a, and is arrange | positioned in the magnetic path forming part 7. .

In this way, the transmission line 51 is arranged in the path forming portion 7 and is surrounded by the path.

As shown in FIG. 9, an adhesive layer 103 is laminated on the core half body 54b, and an insulating layer 104 made of polyimide or the like is laminated on a part of the adhesive layer 103, and on the insulating layer 104. The transmission line 51 mentioned above is formed and the transmission line 51 and the core half body 54b are insulated.

In addition, an insulating layer 105 made of polyimide or the like is laminated on the transmission line 51 using the adhesive layer 106.

In addition, a discharge lamp 5 is connected to the output terminal 51b of the transmission line 51, and a high frequency conversion circuit 3 is connected to the input terminal 51a. The discharge lamp 5 is connected to the output terminal of one ground conductor 52, and the high frequency conversion circuit 3 is connected to the input terminal. In addition, the grounding conductors 52 and 52 are electrically connected by the connecting conductor 53 so as to make the potential equal.

In this transmission line transformer 31, the direction of the magnetic flux generated from the transmission line 51 interposed between the pair of core bodies 54a and 54b as described above is the direction of the current flowing through the transmission line 51. When it is the same as that shown in FIG. 9, it becomes the direction of the arrow shown with code | symbol _Ia , _Ib in FIG.

Therefore, most of the magnetic flux generated from the transmission line 51 flows to the magnetic path constituted by the pair of core halves 54a and 54b, the central convex portion 54c and the peripheral convex portions 54e and 54e. The magnetic flux moving from the core half body 54a to the core half body 54b among the magnetic fluxes generated from the transmission line 51 concentrates on the central convex portion 54c and the peripheral convex portions 54e and 54e and transmits the transmission line 51. Passage flux component which bridges to is small and copper loss becomes small.

Therefore, in the discharge lamp lighting apparatus 30 of the structure mentioned above, the following effects can be acquired in addition to the effect of the discharge lamp lighting apparatus 1 shown to FIGS. That is, since the transmission line transformer 31 has the above-described configuration, the transmissive magnetic flux component which is chained to the transmission line 51 is reduced, and as a result, the copper loss is reduced, and the conversion of the transmission line transformer 31 is performed. Efficiency becomes high and the power loss of the discharge lamp lighting apparatus 30 can be made smaller.

Example

(Example 1)

The frequency characteristics of the boost ratio (voltage gain) of the transmission line transformer when the load impedance was changed were investigated.

Transmission line transformers similar to the transmission line transformer 31 of the discharge lamp lighting device 30 shown in FIGS. 8 and 9 were produced. The thickness of each core half body 54a, 54b made of Mn-Zn ferrite in the transmission line transformer produced here is 0.5 mm, and the height of the central convex part 54c and the peripheral convex part 54e of the core half body 54a is 0.5 mm, the depth of the magnetic path forming section 7 is 0.5 mm, the thickness of the spiral transmission line 51 is 0.04 mm, the width of the transmission line 51 is 0.29 mm, the pitch of the transmission line 51 is 0.24 mm, The thickness of the ground conductors 52, 52 was 0.04 mm. Moreover, the line length D of the transmission line 51 was 1.8 m.

The voltage gain-phase characteristics of the transmission line transformers fabricated here were measured. The measurement here was carried out using an impedance analyzer HP4194A (trade name: manufactured by Hewlett-Packard Co., Ltd.) with a terminating resistor (load impedance) connected to the output terminal of the transformer as 100 kPa. Carbon film resistance was used for the termination resistance. The measurement frequency range was set from 0.01 MHz to 10 MHz so that the point near the resonance could be taken finely. Measurement results when the load impedance is 10 Hz are shown in FIG. 10 and measurement results when the load impedance is 100 Hz is shown in FIG.

As can be seen from Fig. 10, when the load impedance was 10 Hz, the frequency (tuning frequency) when tuning to? / 4 of the transmission line transformer was 930 Hz and the voltage gain was 16.1 dB.

As can be seen from FIG. 11, when the load impedance was 100 Hz, the voltage gain of the transmission line transformer was 24.3 dB.

Therefore, the voltage gain (step-up ratio) of this transmission line transformer varies with load impedance, so that the larger the load impedance, the higher the voltage gain, and the smaller the load impedance, the lower the voltage gain.

Therefore, this transmission line transformer is preferably used for a lighting device such as a discharge lamp having a negative resistance characteristic of high impedance before lighting, which requires applying a high voltage to start discharging, and a low impedance during lighting when a relatively low discharge voltage is applied. It is available.

As described above, the discharge lamp lighting apparatus of the present invention includes a transmission line transformer having a rectification smoothing circuit, a high frequency conversion circuit, and a distribution constant circuit, and a voltage-up ratio (voltage gain) of the transmission line transformer. Is determined by the ratio of the intrinsic impedance of the distribution constant circuit and the load impedance of the discharge lamp connected to the transmission line transformer. The voltage gain can be increased to generate a high voltage required for lighting the discharge lamp.

In addition, since the load impedance of the discharge lamp becomes smaller after the lighting and the voltage gain of the transmission line transformer is lowered in accordance with the decrease in the load impedance, the high frequency AC voltage is lowered and the lighting of the discharge lamp can be stably maintained.

In addition, since the distribution constant circuit operates as an impedance-admittance converter, the output current value of the transmission line transformer is proportional to the input voltage value. Therefore, when the input voltage of the transmission line transformer is made constant, the current value of the high frequency AC voltage outputted can be kept low.

In addition, since the current value of the high frequency AC voltage can be kept constant by the transmission line type transformer, the current limiting inductor, which is essential in the conventional discharge lamp lighting apparatus, is unnecessary and constitutes the inductor of the lamp lighting circuit which was one of the power loss sources. Since the copper coil is unnecessary, the power loss can be lowered, and the discharge lamp lighting device can be miniaturized.

The transmission line transformer comprises a transmission line and a core having dielectric properties and magnetism. The transmission constant circuit is composed of the transmission line and the core. The transmission line length of the transformer has a dielectric constant and permeability of the core. The larger the size, the shorter the core shape, the smaller the transformer itself, and the smaller the size of the discharge lamp lighting device.

In addition, since the core is made of one or two or more selected from the group consisting of Mn-Zn ferrite, Ni-Zn ferrite, and Ni-Cu ferrite, the shape of the transmission line-type trans core is reduced, and the discharge lamp lighting device can be miniaturized. Can be achieved.

And the core is one or two or more elements T selected from the group of Fe, Co, Ni, and Hf, Zr, W, Ti, V, Nb, Mo, Cr, Mg, Mn, Al, Si, Ca, Sr One or two or more elements M selected from the group of Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In, Sn, Sb, Te, Pb, Bi, and rare earth elements, and O, C, N Since it is composed of soft magnetic alloy powder and synthetic resin containing one or two or more elements D selected from the group of B, the permeability and permittivity of the core can be increased, the wavelength shortening effect is sufficient, and the transmission line length is shortened. As a result, the shape of the core is reduced, and the transformer itself is downsized, so that the size of the discharge lamp lighting device can be reduced.

Finally, since the effective permeability (μ) at 100 Hz of the core is 10 to 20000 and the effective dielectric constant (ε) is 10 to 5000, the wavelength shortening effect is sufficient, the length of the transmission line is shortened, and the shape of the core is reduced. The transformer itself can be miniaturized to achieve miniaturization of the discharge lamp lighting device.

Claims (5)

And a rectification smoothing circuit for converting an AC voltage into a DC voltage, a high frequency conversion circuit for converting the DC voltage into a high frequency AC voltage having a frequency higher than the AC voltage, and a distribution constant circuit having a transmission line. A discharge lamp lighting device comprising: a transmission line transformer for boosting a voltage to light a discharge lamp and maintaining a constant current amount of the high frequency AC voltage after the discharge lamp is turned on. 2. The discharge lamp lighting device according to claim 1, wherein the transmission line transformer comprises a transmission line and a core having dielectric and magnetism. The discharge lamp lighting device according to claim 2, wherein the core is made of one or two or more selected from the group consisting of Mn-Zn ferrite, Ni-Zn ferrite, and Ni-Cu ferrite. The method of claim 2, wherein the core is one or two or more elements T selected from the group of Fe, Co, Ni, Hf, Zr, W, Ti, V, Nb, Mo, Cr, Mg, Mn, Al, One or two or more elements M selected from the group of Si, Ca, Sr, Ba, Cu, Ga, Ge, As, Se, Zn, Cd, In, Sn, Sb, Te, Pb, Bi, rare earth elements, A discharge lamp lighting device comprising: a soft magnetic alloy powder comprising one or two or more elements D selected from the group of O, C, N, and B and a synthetic resin. The discharge lamp lighting device according to claim 2, wherein an effective permeability (μ) at 100 Hz of said core is 10 to 20000, and an effective dielectric constant (ε) is 10 to 5000.