JPS5979992A - Device for firing discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD The present invention relates to a discharge lamp lighting device for lighting a low pressure discharge lamp such as a fluorescent lamp.

(Background technology) For the purpose of downsizing and power saving of lighting devices, fluorescent lamps with a smaller tube diameter than conventional ones, and
Fluorescent lamps are being developed that are miniaturized by bending them into a letter shape. However, if the pipe diameter is reduced in this way and the lighting is powered by commercial power, the pressure to re-ignite each cycle will increase!) I can't kick 4d.

Consider the case where such a lamp with a high restriking pressure is lit using a lighting circuit as shown in FIGS. 1 and 2. The one shown in FIG. 1 is a commercial 71+', ir+:IVs
The case shown in Fig. 2 is when the fluorescent lamp FL is turned on via the K choke B, and the case shown in Fig. 2 is the case when the fluorescent lamp FL is turned on via the step-up current limiting magnetic leakage transformer B at ↑14 igi Vs. The diagram will be explained. (In a rung with a high strong voltage, as shown in Figure 8, the restriking part is at the power supply voltage Vs.
(In Fig. 2, the voltage is quadratic?If) or less, so the effective value of the lamp voltage VT is considerably smaller σ compared to the normal case shown by the 4IS line. If the relationship between Vs, rung voltage Vb, and choke voltage VB is expressed in a vector diagram as shown in Figure 4, it is quite different from the case of a normal ramp shown by the broken line. The operating voltage is different, and if it is shown on the current-voltage characteristics, as shown in Figure 5, V
C Normal case (see Figure 1a)) vs. Figure 1 + b) I
Chalk 111.C as shown. The voltage VB and the power supply voltage Vs become very close to each other.

Therefore, if the choke B is used to light the lamp at an operating voltage such as that shown in FIG. 5 1b), a problem arises during starting. In such a fluorescent lamp FL, when the contact of the starting tube S1 is closed, the Lang filament is heated with electricity to emit thermionic electrons, and then the moment the contact is opened, Kf-L-BK
It starts with the high voltage generated.

In this case, the startability greatly depends on the ease of starting, filament heating ↑TT, and current (preheating current), and if it is too small, the startability will deteriorate significantly.

The circuit during preheating is as shown in Figure 6. With the power supply voltage Vs applied to the series circuit of choke B and two filament f, the current value at this time is as shown in Figure 5 (V-1 of bl). The current at the point where the curve intersects the power supply voltage (8) minus the pressure drop of the filament f is several percent smaller than the current at the intersection with the normal power supply voltage Vs.

Startability usually needs to be good within a range of ±lθ% of the rated power supply voltage (secondary voltage), and therefore the preheating current must be sufficient in this range.

However, on the other hand, if the preheating current becomes too large, the filament f
If the temperature becomes too high and the VC power supply voltage changes to a high level, the filament f will be significantly worn out and its life will be shortened.

As a result, choke B is required to obtain good starting performance.
Regarding the V-1 characteristics of 90% Vs Te 1.241L or more preheating current is required, conversely the life is ML, < is 1" as the upper limit of preheating current that is not allowed to be 110% V8 Te 1.781L LJ , it turned out to be below.

Therefore, choke B is used that has an oil-tight iron core, and due to its magnetic saturation characteristics, the V-1 bend bends in the middle, resulting in two linear systems as shown in Figure 7. , 6. CH9-BI3) When the FMJJ working pressure VB is on the straight line 12, the peak value of the lamp current (maximum 11i7 effective value) increases and the life span decreases.

In addition, the rate of fluctuation of the current with respect to the power supply increases, resulting in unstable operation.As a range where such negative effects are small,
In operation, the 11X pressure VB is directly at the refraction point on the #O stone.

The maximum operating voltage VFI that satisfies both the preheating condition and the lamp current peak value is calculated by calculating the maximum operating voltage VFI that satisfies both the preheating condition and the lamp current peak value. 0.79vs.In other words, if a lighting circuit is configured with an operating voltage of VB/vs > 0.79, the initial characteristics will become stratified due to insufficient preheating at startup, or the preheating will be interrupted. If you refuse to take enough, the peak value at the time of lighting will be high and the lifespan will be 1 degree.
However, at the same time, the fluctuation rate of the lamp current with respect to the source increases, resulting in unstable operation.

(Object of the Invention) The present invention has been made in view of the above-mentioned drawbacks, and its object is to reduce the power loss in the lighting device when lighting a single-tongue pressure discharge lamp having a heavy pressure waveform with a high restriking voltage. To do so again without increasing the
K provides a discharge lamp lighting device with improved lamp life and starting performance.

(Disclosure of the Invention) FIG. 8 shows an embodiment of the present invention.
a'ii Vs t, 0.79 <VB /Vs (
A fluorescent lamp F having a body A is electrically connected to a power supply Vs in the vicinity of a working choke B and a filament electric shock.
L and Start II? It consists of SJ, '. The configuration of the surface and filament electrodes may be as shown in FIG. 9, and may be a type of lamp in which the support wire supporting the filament f is used as is.The lamp is a fluorescent lamp. There is no g Qλ that can be limited to
<VB/■2<1. However, the secondary pressure is 71L at V2Pi 9% load.

Next, the operation will be explained. Filament fI7) Wire diameter is.

It is determined by the rung current IL during lighting. In other words, the temperature of the filament heated by the lamp current IL vC,
In particular, the temperature of the cathode spot can be selected to be positive. According to Ki G6 Akira, when the anode ±cycles, the conductor a placed near the filament f causes the filament 1 to
does not become an anode, and this conductor λ substantially acts as an anode gI
Make h. Therefore, the temperature of the filament (f) becomes lower than it would be in the case where there is no constriction body (a), and the filament itself is essentially in a state where the ring is in the air and the flow IL is 1 degree. The curve of It, -Tr is transformed from ■ to ■, and as a result, the filament temperature T
In order to maintain the appropriate pressure for r, it is necessary to reduce the wire diameter Dr of the filament f, and the curve It, -Dr (filament temperature Tf is constant), which is not shown in Fig. 11, must be converted to ■1.1: Nothing.

In this way, using a filament selected to be 1@positive for a current phase smaller than the actual rung current, o, 79<
When lighting with a choke operating at an operating voltage VB where VB/Vs < t, the disadvantage of the conventional example described above is that
Dr. is erased in one act. In other words, during preheating, the current is
When the diameter of the filament wire is made thinner in order to flow through the filament chisel, the preheating conditions described in m1 shift to the concave direction of the current. Therefore, as shown in FIG. 12 (in the conventional example, the operating voltage VB
It is possible to bring the curve within the appropriate preheating range (diagonal part m in the figure) even with a larger operating voltage VB than when VB is the largest. still.

In the figure, ■ indicates the characteristics related to the present invention, ■ indicates the characteristics related to the conventional example VC, and range H indicates the preheating range of the conventional example.

In this way, conventionally, when starting 1) Lack of W) K
Starting performance was below 1°C. 0, 79 < VB, /
Even for a discharge lamp lighting device using a chili-chip that operates at an operating voltage of Vs < 1, the present invention allows preheating to be performed sufficiently and under appropriate conditions without becoming excessive, thereby ensuring long startability. This allows the filament temperature to be maintained appropriately during lighting. At the same time, conductor a is used not only to control the filament temperature during lighting, but also as a nearby conductor to prevent local discharge of the filament during preheating.
H, which has the effect of further improving startability.

(Effects of the Invention) As described above, the present invention provides a one-tongue pressure discharge lamp in which a conductor is disposed near the filament.

Since the power supply is connected to the power supply to the eight bodies above, the power supply voltage is normally expected to fluctuate (approximately 10L?/)t, and the power supply voltage at startup is 1τ. Setting the preheating mold temperature appropriately will prevent splintering, improve starting performance, and also reduce the lamp life by one degree due to unforeseen overwinter conditions. Since the filament temperature Iy can be maintained at an appropriate level during lighting, there is no risk of the lamp life decreasing by 1 degree Celsius.

[Brief explanation of the drawing]

Figures 1 and 2 are circuit diagrams of the conventional example, and the εrWP diagram is the circuit diagram of the conventional example.
7 I of each part in Pi-! II1 waveform diagram, Figure 4 e
”, lamp Yamakawa and Chi, -ri? ! Figure 5 is a vector diagram showing the relationship between pressure, Figure 5 is a ViV-1 characteristic diagram, Figure 6 is a circuit diagram during preheating, Figure 7 is a V-1 characteristic diagram, and Figure 8 is an example of the present invention. 9 is a simplified diagram showing different embodiments of the tunic section, FIG. 10 is an Ib-Tr characteristic diagram, and FIG. 11/d
It, −Dr characteristic diagram, @12 Figure V −,1 characteristic diagram, s. -4'l 1st vli B 5th (σ) (b
) No. 61 Fig. 7 478- Fig. 8 No. 9 Flash

Claims (1)

[Scope of Claims] 11) Discharge lamp lighting consisting of a specific pressure discharge lamp, each with a specific pressure discharge lamp disposed near a pair of Myramen L-Denkaku, connected to a commercial power source via a lighting device. In the device, when the operating voltage of the lighting device is VB and the voltage of one box is Vs, the above pair of conductors is set in the range of 0.79 < VB/Vs < 1.0, and the pair of conductors are A discharge lamp lighting device characterized by being connected to.