JP2002330594A - Power supply device, discharge lamp lighting device, and compact self-ballasted fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device, which can surely start up. SOLUTION: A capacitor C4 for cutting DC and a capacitor 6 for resonance are charged by turning on a first field effects transistor Q1. Electric charge of the capacitor C4 for cutting DC is discharged by closing a circuit of a parasitic diode comprising the first field effects transistor Q1, a resistor R3, an inductor L3 for resonance, a resistor R2 and the capacitor 4 for cutting DC. Voltage applied to the gates of the first and the second field effects transistors Q1 and Q2 are reversed each other. An inverter circuit 34 is surely started by turning on or off the first and the second field effects transistors Q1 and Q2, respectively. A high frequency voltage is applied to a light emitting tube 4, by alternately turning on and off the first and the second field effects transistors Q1 and Q2. The light emitting tube 4 is started up and lighted on when the resonance voltage flowing through a capacitor 5 is raised to a predetermined value or higher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, a discharge lamp lighting device, and a compact fluorescent lamp which can be reliably started.

[0002]

2. Description of the Related Art Conventionally, as a discharge lamp lighting device of this type, for example, a configuration described in Japanese Patent Application Laid-Open No. 2000-333470 is known. This Japanese Patent Application Laid-Open No. 2000-333
In Japanese Patent No. 470, a half-bridge type inverter circuit having a pair of complementary field-effect transistors of different polarities connected in series is connected to a DC power supply, and the half-bridge type inverter circuit is located on the low voltage side of the DC power supply of the inverter circuit. A load circuit is connected to the field effect transistor. This load circuit is connected to a fluorescent lamp via a DC cut capacitor and an inductor.

In addition, a feedback circuit having a resonance capacitor and a resonance inductor for extracting an AC component of the DC cut capacitor including a DC cut capacitor is provided, and a resistor connected to the high voltage side of the DC power supply is provided. And one end of the feedback circuit is connected to each gate of the field effect transistor of the inverter circuit.

The AC component of the DC cut capacitor is extracted, and the driving circuit alternately drives the pair of field effect transistors.

[0005]

However, in the configuration described in the above-mentioned conventional Japanese Patent Application Laid-Open No. 2000-333470, the charged polarity of the resonance capacitor and the DC cut capacitor of the feedback circuit depends on the electric field on the high voltage side. In a closed circuit including an effect transistor, the polarity is reversed, the charge of the DC cut capacitor is not discharged, and starting may not be possible until the charge of the DC cut capacitor is naturally discharged to a predetermined value. have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a power supply device, a discharge lamp lighting device, and a compact fluorescent lamp that can be reliably started.

[0007]

According to a first aspect of the present invention, there is provided a power supply device comprising: inverter means for converting a voltage of a DC power supply having a pair of switching elements connected in series; and the other end of the DC power supply of the inverter means. A load circuit having a capacitor and an inductor connected in parallel to any of the switching elements located on the side; a resonance inductor including the capacitor of the load circuit and extracting an AC component of the capacitor; and a feedback having a resonance capacitor. A circuit, an impedance element connected to one end of a DC power supply, and a discharging circuit connected in parallel to a resonance capacitor, and a driving means for controlling a switching element of an inverter means. The charge in the capacitor of the load circuit is transferred to at least one end of the DC power supply. By discharging through a load element, an impedance element, and a discharge circuit, the discharge of the capacitor of the load circuit can be shortened, and the AC component of the load circuit capacitor can be inverted by a feedback circuit having a resonance capacitor and a resonance inductor. , The switching element can be reliably turned on and off, and starting can be ensured.

According to a second aspect of the present invention, there is provided the power supply unit according to the first aspect, wherein the switching elements are complementary types having different polarities, and each of the switching elements is controlled by driving means. By outputting the same polarity to the switching elements having the same polarity by the driving means, the switching elements are alternately turned on and off, thereby preventing a pair of switching elements from being simultaneously turned on.

According to a third aspect of the present invention, there is provided the power supply device according to the first or second aspect, further comprising timing setting means for setting the ratio of the ON time of each switching element. By changing the ratio of the ON time of the switching elements, for example, even if the ON times of the respective switching elements are unbalanced, the same time can be obtained.

According to a fourth aspect of the present invention, there is provided a discharge lamp lighting device including the power supply device according to any one of the first to third aspects having a discharge lamp in a load circuit.

According to a fifth aspect of the present invention, there is provided a bulb-type fluorescent lamp comprising: a discharge lamp lighting device according to the fourth aspect; and a fluorescent lamp which is a discharge lamp to be lighted by the discharge lamp lighting device. Has the effect of

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a bulb-type fluorescent lamp according to the present invention.

FIG. 1 is a circuit diagram showing a discharge lamp lighting device, and FIG.
FIG. 1 is a partially cutaway side view showing the appearance of a bulb-type fluorescent lamp.

As shown in FIG. 2, reference numeral 1 denotes a bulb-type fluorescent lamp, and this bulb-type fluorescent lamp 1 comprises a cover 2 and a base 3.
, An arc tube 4 as a fluorescent lamp as a discharge lamp housed in the envelope, and a circuit board 5
The circuit board 5 has at least a part of the discharge lamp lighting device 6 attached thereto. The envelope has, for example, an outer shape approximating the standard size of a mini krypton type light bulb, and has a dimension in the height method from the base 3 to the tip of the arc tube 4, that is, the total lamp length is 90 mm or less, for example, 81 m.
m, the outer diameter is formed to be 40 mm.

The cover 2 has a substantially cylindrical base 11 which expands downward. An annular partition 12 is attached to the lower end of the base 11. Also,
The base 11 and the partition 12 are made of, for example, a heat-resistant synthetic resin such as polybutylene terephthalate (PBT). Further, the partition body 12 has a cylindrical tubular portion 13.
A disc-shaped partition plate (not shown) is formed inside the cylindrical portion 13, and the arc tube 4 is attached to the partition plate.

The base 3 is an Edison type E17.
The upper end of the base 11 is covered with a mold or the like, and is fixed with an adhesive or a caulking.

Further, the arc tube 4 is provided with a bulb 21 made of glass.
A three-wavelength phosphor is formed on the inner surface of the bulb 21, for example. The bulb 21 is filled with a rare gas such as argon (Ar) or a sealed gas containing mercury (Hg). Also, this valve 21
Has, for example, three tubes 23a, 23b, and 23c having substantially the same shape. These tubes 23a, 23b, and 23c have, for example, a substantially cylindrical glass cross section having an outer tube diameter of about 11 mm. The tube is
It is formed in a substantially U-shape having a top portion which is curved at an intermediate portion. That is, each of these pipes 23a, 23b, 23c has a curved bent portion 24 for controlling the vapor pressure of mercury, and a curved bent portion 24.
And a pair of straight pipe portions 25 which are continuous with each other. Each of the pipes 23a, 23b, and 23c has a substantially U-shaped state and a sealing length, which is the length of the bent portion 24 and the end in the height direction, is about 42 mm.

As a result, the vicinity of the adjacent ends of the tubes 23a, 23b, and 23c are sequentially connected by a communication tube 26 (not shown) to form one continuous discharge path 27. The communicating tube 26 is formed by heating and melting the connecting end of each of the tubes 23a, 23b, and 23c, and then connecting the openings formed by blowing. And each tube 23a, 2
The straight tube portions 25 of 3b and 23c are positioned at equal intervals on the same circumference centering on the central axis of the bulb-shaped fluorescent lamp 1, that is, the straight tube portions 25 of the respective tube bodies 23a, 23b and 23c are It is arranged corresponding to each vertex of the square.

As shown in FIG. 1, the discharge lamp lighting device 6 includes an impedance element Z1 which is short-circuited at a voltage of 330 V across a commercial AC power supply e via a fuse F, and a capacitor C1 having a capacity of 0.12 μF. A configured filter circuit 31 is connected, and the filter circuit 31 includes a rectifier circuit such as a diode bridge as full-wave rectifier.
An AC input terminal 32 is connected, and a smoothing capacitor C2 having a capacitance of 9 μF is connected to the DC output terminal side of the rectifier circuit 32 via an inductor L1 having an induction of 150 μH.
The DC power supply 33 is connected to an inverter circuit 34 as a self-excited half-bridge type inverter means serving as AC-DC conversion means.

The inverter circuit 34 has a drain and a source of an N-channel first field-effect transistor Q1 having a current value of 3.8 A as a switching element and a P-channel second electric field having a current value of -2.5 A. The drain and source of the effect transistor Q2 are connected in series, and are configured in a complementary manner. The gate capacitance of the first field-effect transistor Q1 and the gate capacitance of the second field-effect transistor Q2 are defined as resonance capacitance. Also, the second field effect transistor Q2
A capacitor C3 as a snubber capacitor having a capacitance of 3300 pF and a resistance value of 82 kΩ
Are connected in parallel with each other.

Further, a load circuit 35 is connected between the drain and the source of the second field-effect transistor Q2. The load circuit 35 has a DC cut capacitor C4 having a capacitance of 0.1 μF and an induction amount of 0.245 mH. Filaments 4a and 4b of the arc tube 4 via a choke coil L2 as an inductor
Is connected, and a starting capacitor C5 having a capacity of 3900 pF is connected between the other end of the filament 4a and one end of the filament 4a. The resonance circuit 36 is formed by the DC cut capacitor C4, the choke coil L2, and the capacitor C5. The arc tube 4 has a voltage of 40.
Since the current becomes 0.22 A at V, the resistance value between both ends at the time of lighting is 180Ω.

Still further, a first field effect transistor
A gate drive circuit 37 as drive means is connected to the gate of Q1 and the gate of the second field effect transistor Q2. The gate drive circuit 37 includes a zener diode ZD1 having a zener voltage of 24 V and having a zener voltage of 24 V connected in series between the gate and the source of the first field effect transistor Q1.
And a protection circuit for protecting the gate of the first field-effect transistor Q1 of the zener diode ZD2 and the second field-effect transistor Q2. The protection circuit includes a zener diode ZD1, a zener diode ZD2, and a capacitor C3. In parallel, a resonance inductor L3 with an induction of 0.47 mH and a resonance capacitor with a capacitance of 0.047 μF
A feedback circuit 38 of a series circuit of C6 is connected, a resistor R2 having a damping function as a discharge circuit having a resistance value of 82 kΩ is connected in parallel with the resonance capacitor C6, and a capacitor C6 is connected.
A resistance 470 between the connection point of C2 and the drain of the first field-effect transistor Q1, the gate of the first field-effect transistor Q1, and the gate of the second field-effect transistor Q2.
A resistor R3 as an impedance element of kΩ is connected. Further, the equivalent gate capacitance of the resonance inductor L3, the resonance capacitor C6, the first field effect transistor Q1, and the second field effect transistor Q2 is L
The C series resonance circuit 39 is configured. Note that the resonance capacitor C6 is for removing a DC component.

Note that chip capacitors are used for the capacitors C3, C4, and the resonance capacitor C6, and since the characteristics of the chip capacitors tend to change with temperature, the circuit on the side opposite to the side where the arc tube 4 is located is used. It is mounted on the substrate 5 to prevent a decrease in the capacity of the capacitor C6 due to the thermal influence of the arc tube 4, and to ensure the operation.

Next, the operation of the discharge lamp lighting device 6 of the embodiment shown in FIG. 1 will be described.

First, the AC voltage of the commercial AC power supply e is full-wave rectified by the rectifier circuit 32 and smoothed by the capacitor C2 to be DC. When the capacitor C2 is charged, the first field-effect transistor Q1 and the second field-effect transistor
The voltage of the capacitor C2 is applied between both terminals of Q2. In this state, when a voltage is applied to the gates of the first field effect transistor Q1 and the second field effect transistor Q2 via the resistor R3, only the first field effect transistor Q1 turns on and the voltage of the capacitor C2 Is applied to the parallel circuit of the first field-effect transistor Q1, the resistor R1, and the capacitor C3, and the current flows through the drain and source of the first field-effect transistor Q1, and the parallel circuit of the capacitor C3 and the resistor R1, The first field effect transistor Q1 turns on.

In this state, a current flows from the capacitor C2 in a closed circuit of the first field-effect transistor Q1, the DC cut capacitor C4, the choke coil L2, the filament 4a, the capacitor C5, the filament 4b, and the capacitor C2, The capacitor C4 is charged so that the first field-effect transistor Q1 side becomes a positive electrode.

Thereafter, the current is inverted by the resonance action of the load circuit 35, the polarity of the capacitor C4 is inverted, and the voltages applied to the gates of the first field effect transistor Q1 and the second field effect transistor Q2 are inverted. Direction, the first field-effect transistor Q1 turns off, the second field-effect transistor Q2 turns on, and the inverter circuit 34 starts. Further, when the voltage applied to the gates of the first field-effect transistor Q1 and the second field-effect transistor Q2 is inverted, the first field-effect transistor Q1 is turned on and the second field-effect transistor Q2 is turned off. .

Thereafter, the voltage of the capacitor C4 with respect to the sources of the first field-effect transistor Q1 and the second field-effect transistor Q2 becomes negative, and the phase of the drive power supply taken out of the capacitor C4 is appropriately adjusted. By inverting the voltage of the capacitor C4, the AC component of the capacitor C4 is taken out, the voltage of the resonance capacitor C6 also becomes negative, the first field-effect transistor Q1 turns off, and after the first field-effect transistor Q1 turns off, The second field-effect transistor Q2 is turned on, the operating frequency is determined by the resonance inductor L3, the LC series resonance circuit 39 of the first field-effect transistor Q1, and the second field-effect transistor Q2, and the first field-effect transistor Q1 And the second field-effect transistor Q2 are turned on and off alternately to apply a high-frequency voltage to the arc tube 4 and When the resonance voltage across the capacitor C5 rises above a predetermined value, the light-emitting tube 4 is started, turned.

If the threshold voltages of the first field effect transistor Q1 and the second field effect transistor Q2 may be exceeded at the time of startup, the first field effect transistor may be changed by changing the resistance value of the resistor R2. It is possible to prevent the transistor Q1 and the second field-effect transistor Q2 from exceeding the threshold voltage.

After operating the discharge lamp lighting device 6,
For example, when the power is turned off by turning off the power switch, the charge stored in the DC cut capacitor C4 is converted into the DC cut capacitor C4 and the first field effect transistor.
The capacitor C4 is discharged when the parasitic diode of Q1, the resistor R3, the resonance inductor L3, the resistor R2, and the DC cut capacitor C4 are closed, and the resonance capacitor C6 is discharged when the resonance capacitor C6 and the resistor R2 are closed. . Due to this discharge, even if, for example, a starting resistor is not provided in parallel with the Zener diode ZD1 and the Zener diode ZD2, even if the power is turned on immediately after the power is turned off, the power is supplied via the resistor R3 and the capacitor C4. Since the starting current can be reliably supplied, the restart can be reliably performed.

As described above, the compact fluorescent lamp 1 is
Input power rating 9W, about 10% of which is discharge lamp lighting circuit 6.
The lighting frequency is 150 kHz and 3
A total light flux of 480 lm is obtained by using a wavelength-emitting phosphor.

Next, another embodiment will be described.

In the case of the discharge lamp lighting device 6 shown in FIG.
By connecting R2, as shown in FIG. 3, for example, the on-time of the second field-effect transistor Q2 becomes about 30% longer than the on-time of the first field-effect transistor Q1, and the light emission of the arc tube 4 flickers. Sometimes. In this case, the on-time of the second field-effect transistor Q2 is shortened by using the Zener diode ZD2 as a timing setting means rather than the Zener diode ZD1 and setting the Zener voltage of the Zener diode ZD2 larger than the Zener diode ZD1. , The first field effect transistor Q1 and the second
Of the field effect transistor Q2 can be made almost equal, and the flickering of the arc tube 4 can be prevented.

Next, another embodiment will be described with reference to FIG.

FIG. 4 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. The discharge lamp lighting device 6 shown in FIG. 4 is different from the discharge lamp lighting device 6 shown in FIG.
A startup resistor R6 is connected in parallel with the series circuit of ZD1 and zener diode ZD2.

The basic operation is the same as that of the discharge lamp lighting device 6 shown in FIG. 1, but before starting the arc tube 4, the capacitors C2, R3, R6, R1 and C2
Can be formed, through which the direct current can flow, so that the start-up of the inverter circuit 34 is ensured.

Another embodiment will be described with reference to FIGS.

FIG. 5 is a side view of the compact fluorescent lamp, and FIG. 6 is a plan view of the compact fluorescent lamp.

As shown in FIGS. 5 and 6, the bulb 21 of the light bulb-shaped fluorescent lamp 1 has two bulbs having different top curvatures.
A total of four substantially U-shaped pipes 23a, 23b, 23 of two types each
Adjacent ends of c and 23d are sequentially connected by a communication pipe (not shown) to form one continuous discharge path 27, and the discharge length is about 16 cm. In the light emitting tube 4 of the bulb-type fluorescent lamp 1, the inner diameter of each of the tubes 23a, 23b, 23c and 23d is 6 mm.

The light-emitting tube 4 of the bulb-type fluorescent lamp 1
Are housed in the glove 51 while being attached to the cover 2. The globe 51 is a transparent or light-diffusing milky white or the like, and is formed of glass or a synthetic resin into a substantially spherical shape similar to the shape of a glass bulb of a mini krypton type bulb.

[0041]

According to the power supply device of the first aspect, the electric charge charged in the capacitor of the load circuit is discharged at least through the switching element, the impedance element, and the discharge circuit at one end of the DC power supply. Since the discharge of the load circuit capacitor can be performed in a short time and the AC component of the load circuit capacitor can be supplied to the switching element of the inverter means by the feedback circuit having the resonance capacitor and the resonance inductor, the switching element can be reliably turned on and off. Can be started, and starting can be surely performed.

According to the power supply device of the second aspect, in addition to the power supply device of the first aspect, the switching elements are complementary with different polarities, and each of the switching elements is controlled by the driving means. By outputting the same polarity to the switching elements having the same polarity by the driving means, the switching elements are alternately turned on and off, thereby preventing the paired switching elements from being turned on at the same time.

According to the power supply device of the third aspect, in addition to the power supply device of any one of the first to third aspects, by changing the ratio of the ON time of each switching element by the timing setting means, for example, Even if the on time of the switching element is unbalanced,
Can be in equal time.

According to a fourth aspect of the present invention, there is provided a discharge lamp lighting device, wherein the load circuit includes a discharge lamp.
Since the power supply device according to any one of (3) to (3) is provided, the respective effects can be obtained.

According to the bulb-type fluorescent lamp according to the fifth aspect, since the fluorescent lamp which is the discharge lamp lit by the discharge lamp lighting device according to the fourth aspect is provided, each effect can be obtained. it can.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a discharge lamp lighting device of the present invention.

FIG. 2 is a partially cutaway side view showing the appearance of the light bulb-type fluorescent lamp.

FIG. 3 is a waveform chart showing operations of a first field-effect transistor and a second field-effect transistor of the discharge lamp lighting device.

FIG. 4 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 5 is a side view showing a compact fluorescent lamp according to another embodiment of the present invention;

FIG. 6 is a plan view of the same.

[Explanation of symbols]

Reference Signs List 1 bulb-type fluorescent lamp 4 discharge lamp, arc tube as fluorescent lamp 6 discharge lamp lighting device 34 inverter circuit as inverter means 35 load circuit 37 gate drive circuit as drive means 38 feedback circuit C4 capacitor C6 resonance capacitor L2 as inductor Choke coil L3 inductor for resonance Q1 first field-effect transistor as switching element Q2 second field-effect transistor as switching element R2 resistance as discharge circuit R3 resistance as impedance element

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K072 AA02 AA05 AC11 BA03 BB01 BC01 BC03 CB02 DB03 GA02 GB12 5H007 AA01 BB03 CA02 CB03 CB12 CB22 CC03 DC05 EA09 FA01 GA01 GA08 HA04 HA07

Claims (5)

[Claims] 1. Inverter means having a pair of switching elements connected in series and converting a voltage of a DC power supply;
A load circuit having a capacitor and an inductor connected in parallel to one of the switching elements located at the other end of the DC power supply of the inverter means; and a resonance including the capacitor of the load circuit and extracting an AC component of the capacitor A feedback circuit having an inductor and a resonance capacitor, an impedance element connected to one end of the DC power supply, and a discharge circuit connected in parallel to the resonance capacitor, and a switching element of an inverter means. And a driving means for controlling. 2. The switching elements are complementary with different polarities.
The power supply device according to claim 1, wherein the power supply device is controlled by a driving unit. 3. The power supply device according to claim 1, further comprising timing setting means for setting a ratio of an ON time of each switching element. 4. A load circuit having a discharge lamp.
A discharge lamp lighting device comprising the power supply device according to any one of claims 3 to 3. 5. A bulb-type fluorescent lamp comprising: the discharge lamp lighting device according to claim 4; and a fluorescent lamp which is a discharge lamp to be lighted by the discharge lamp lighting device.