JPS58165292A - 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

[Detailed description of the invention] The present invention relates to a discharge lamp lighting device.

As shown in Fig. 1, a conventional discharge lamp lighting device consists of a series circuit of a pair of transistors eQ2 with emitters commonly connected between both ends of the primary winding N of a leakage flux type oscillation transformer OT, and a common geometry. Connect the capacitor C and connect both ends of the feedback winding N3 to the transistors Q and Q2, respectively, and connect the transistor Q1 from the base circuit B.
sQ21C supplies the base current and connects the middle point of the primary winding N and the transistor terminal.

By applying a DC voltage between the emitter of Q2 and the emitter of transistor Q through cheek coil CH.

C4 is alternately turned on and off to excite the primary side of the oscillation transformer OT, and a high frequency output is obtained from the secondary winding N2 of the oscillation transformer OT.

As shown in the equivalent circuit of Fig. 2, this high-frequency output is first generated by the capacitor C by the resonance circuit of the leakage inductance L on the secondary side of the oscillation transformer OT and the capacitor C2.
A high voltage is generated across the capacitor C3 to light up the discharge lamp LA2, and then a high voltage is generated in the capacitor C3 through the resonance circuit of the leakage inductance L and the capacitor C3 to light the discharge lamp LA. It's K.

Such a discharge lamp lighting device has a discharge lamp LA1. Since LA2 is turned on, the oscillation transformer 0TOVA is made smaller and the oscillation transformer 0 is turned on.
Tt - Can be made smaller. However, in such a configuration, the discharge rung LA2 moves on the started ilK discharge discharge rung A1, and the secondary voltage of the oscillation transformer OT becomes v2, the discharge rung 'LA, e LA2Oyy
Voltage wo v, LA engineering, v, LA2, Langmi flow ILA
Then, in the case of pulsating lighting, they are as shown in Figure 3 ~ (to)
The relationship is as follows, which has the disadvantage that the rung current stop section becomes long and the luminous efficiency is low.

Another conventional discharge lamp lighting device is shown in FIG. Connect the circuits in parallel and discharge lamp L
The midpoint of ANm LA2 and the midpoint of capacitor C4#C5 are connected.

This discharge lamp lighting device generates a resonant voltage in the capacitor C4ec5 by a resonant circuit of the leakage inductance L on the secondary side of the ignition transformer OTO and the series circuit of the capacitors tc4 e C5, and lights up the discharge rungs LA and GLA2 at the same time. It is something that makes you However, capacitor C4e
Only a voltage divided by i of the voltage actually increased can be applied to both ends of C50, and in order to start the discharge rungs LAN * LA2 at the same time,
It is necessary to increase the secondary induced voltage of the excavation transformer OT,
When lighting by lowering the Vk of the oscillation transformer OT, there was a drawback that the discharge lamp LA*LA2 was difficult to start.

Therefore, it is an object of the present invention to provide a discharge lamp lighting device that can shorten the pause period of the Langmi style, and can easily start the run 1.
. □Yes.

An embodiment of the present invention will be described based on FIGS. 5 to 8. As shown in FIG. 5, the discharge lamp lighting device of this embodiment includes a series circuit of a discharge ring LA2 and a capacitor C6 between both ends of the secondary winding N2 of the excavation transformer OT.
*If you connect the series circuit of C7 in parallel and connect the diode D□ in parallel to the capacitor C, the result will be 4K”7 capacitor
Connect a diode - in parallel to fl so that it has the opposite polarity to diode D□, and connect it to discharge rung LA. A switch S is connected between the midpoint of LA2 and the midpoint of capacitor C65C7, and this switch S is turned on for several cycles immediately after the power is turned on.
L, I try to turn it off when the light is stably lit after that.

The configuration of the primary side of the oscillation transformer OT is the same as that of the conventional example.

Next, the operation of this discharge lamp lighting device will be explained.

When the power is turned on, the transistors Q and Q2 alternately turn on and off, and a high frequency voltage is induced in the secondary winding N2 of the oscillation transformer 0, as in the conventional example. When this secondary induced voltage v2 is in the direction of the oH line arrow in the figure, the capacitor C2 is charged through the diode drawer, and the voltage vasa of the capacitor C2 is the oscillation transformer O shown by the equivalent path in FIG.
The voltage is increased to a voltage determined by the leakage inductance L of T and the capacitor C2. Then, the secondary induced voltage v2 of the capacitor C2 reaches its peak in the direction of the solid arrow and is discharged through the capacitor C and the leakage inductance L. On the other hand, when the secondary induced voltage v2 is in the direction of the dashed arrow in the figure, the capacitor C is passed through the diode D.
is charged and the voltage across capacitor C is V. , C is boosted to a voltage determined by leakage inductance L and capacitor C2. After the secondary induced voltage v2 reaches a peak in the direction of the dashed arrow, the capacitor C becomes a leakage inductance and is discharged through the capacitor C2.

Figure 7 shows the waveform of secondary induced voltage v2 at no load,
T is 1 of the power supply frequency. The cause of lsB is! 1! The waveform diagram of each part in Figures 5 and 6, Figure 8 (131 shows the vector diagram of each voltage at each moment in the figure, voltage V. is the composite voltage of voltage V. l' v02, vL is the voltage of the leakage inductance, and Φ is the leakage flux of the oscillation transformer OT.

The operation described above is repeated under no load,
Capacitor C6e for each half cycle of secondary induced voltage v2
Alternately boosted voltages are generated across C7. Therefore, discharge ramp 'LA, LA2KFi every half cycle diode D, → capacitor C6 → leakage inductance L 1 and leakage inductance L → diode D1
→The voltage boosted by loop 1 of capacitor C7 is simultaneously applied to discharge rung LA.

LA2 lights up at the same time. Switch S is discharge rung L
A, until LA2 starts, it is short-circuited and the voltage across capacitor Cec2 is vc1. VO2 is applied to each of the discharge rungs LA and LA2, and after the run 1 is lit, it is opened and the combined voltage v0 of the capacitor C0°C2 is applied to the series circuit of the discharge rungs LA and LA2.

As a result of this configuration, in the second lighting method with two lights in series,
During stable lighting, two discharges are activated.
ra lights up at the same time: and the rung current:::, (WEfIKfRIiEMl < 1 v ?f?J +
aMl, : , rAi < l b, t c.

Power on II! [Then the LCuI column circuit] The peak value of the boosted voltage itself is the discharge rung LA1, LA2
Since the voltage is applied to both ends of the oscillation transformer OT, the rung starting voltage can be easily obtained even if the VA of the oscillation transformer OT is lowered. Another embodiment of the present invention is shown in FIG. In other words, this discharge lamp lighting device uses a commercial power supply V8 and a chili instead of an inverter.
Capacitor C6e C7 in series circuit with coil C) r
e diode D□eDa. Discharge rung LA, LA2
and switch S are connected, and the effect is similar to that of the previous embodiment.

As described above, the discharge lamp lighting device of the present invention has AC vL
#, a stabilizing element connected in series to this AC power source, a series circuit of first and second discharge lamps connected in parallel to the series circuit of said AC [# and stabilizing element, and I! tI era exchange-
When connected in parallel in a series circuit of sources and stabilizing elements, the first and #! a series circuit of two capacitors, and a series circuit of two capacitors;
A diode ls2 connected in parallel to the capacitor , a diode ls2 connected in parallel to the second capacitor so as to have opposite polarity to the diode 11111, and a diode ls2 in the first and second discharge rungs. Dot and IU Ki @
1 and the midpoint of the second capacitor, which opens the connection after stable lighting is complete, so the run 1 current rest period can be shortened to increase luminous efficiency, and the run start voltage can be easily adjusted. This stone has the effect of being able to be obtained.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a conventional discharge lamp lighting device, Figure 2 is an equivalent circuit diagram of its main parts, Figures 3 (DJ) are waveform diagrams of each part, and Figure 4 is another conventional discharge lamp lighting device. A circuit diagram of the electric light lighting device, Fig. 5 is a circuit diagram of a dormitory embodiment of this invention, Fig. 6 is an equivalent circuit diagram of its main part, Fig. 7 is a waveform diagram of the inverter output voltage, and Fig. 8 (AI is a waveform diagram of each part, Figure 8 is a vector diagram of each voltage, and Figure 9 is a circuit diagram of another embodiment of this invention. From OT!) Lance, Q Engineering, Q2...Transistor, LAl, LA2...Discharge ring, C6e C7.
...Diode, Dle D$! ...diode, S
...Switch H Fig. 1 H Fig. 4 H N3 Fig. 5 V [ Fig. 6 6'

Claims (2)

[Claims] (1) An AC power supply, a stabilizing element connected in series to this AC power supply, a series circuit of Ill and a 20th discharge tunnel 1 connected in parallel to a series circuit of the AC power supply and the stabilizing element, and the AC power supply series and a series circuit of a first hexagram and a second capacitor connected in parallel to the series circuit of the stabilizing element and whose midpoint was connected to the midpoint of the first and second discharge rungs; a first diode, a second diode connected in parallel to the second capacitor so as to have opposite polarity to the first diode, and a midpoint between the first and second discharge lamps and the first and second capacitors; A discharge lamp lighting device comprising: a switch that opens the connection between the center point of the second capacitor and the second capacitor after stable lighting. (2) The discharge lamp lighting device according to claim (1), wherein the Itl distribution AC power source is an inverter.