JPS5846598A - 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.

The conventional discharge lamp lighting device, as shown in Fig. 1, has a square wave inverter #XiaN4 at a pair of output ends.
A pair of filaments t1 of the discharge lamp LA through l, f
．． One end t of each of fg is connected to the pair of fiwomen rt1.fg of the discharge lamp LA. A resonant starting capacitor C1t is connected to each Ikebata of r2, and the values of the TEC coil Lsp and the co-starting capacitor +01 are set so as to resonate with the fundamental wave of the square wave inverter INIDa. In this case, the square wave invert I lN1
T! , DC current mEx -E2 and transistor I Trl,
Tr2 and diode D1. D2, and transistors Tr1. Add a control signal to the pace of Tr2 to make transistors Try and Tr2 k alternately conductive.
It is designed to supply power to the load.

This discharge lamp lighting device is made with a common loss starting condenser tc1tiit,
The preheating lamp current ILt, which resonates with the fundamental wave of the output of the square wave inverter IN1, flows through the filament of the discharge lamp LA) rl and fg, and the fundamental wave resonance of the chikukoi A/L and the resonant starting capacitor fCl flows. Obtain a high starting voltage and start the discharge pump LAt, - start i
t 12 f w - Lamp current for lighting discharge lamp LAK as inductance ballast of Kukoi A/L■L
Flow the discharge hump LAI to make it turn on stably.

However, the conventional discharge lamp lighting equipment (Wt), which is similar to the conventional discharge lamp lighting equipment (Wt), is not suitable for the first hour of operation (the filament of the discharge lamp LA) fl.

f/) When the emitter wears out, there is a possibility that a larger than necessary lamp current that resonates with the fundamental wave will flow, so in order to suppress the lamp current (preheating current) at the time of starting,
'The frequency of the resonance A fundamental wave of LP and the resonance starting capacitor C1 was shifted slightly to the leading phase side (if it was shifted to the slowing phase side, the actance of the resonance starting capacitor C1 was small, so the boosting effect ).

Figure 2 (AI shows the waveform of the output voltage VL of the square wave inverter IN1 that is applied to the discharge lamp lighting device by shifting the resonance point t, and M2 shows the waveform of the output voltage VL of the square wave inverter IN1. The waveforms of the lamp current IL at the time of lighting (at the time of slow phase) are shown, and the waveforms of the lamp current IL at the time of starting spinning (at the time of advance phase) are 2, Try: Off+D.
1: On → D1 smell → Tr2: On')Try
: Off → D2: On → D2: Off -47r1: Run 1 current IL flows by repeating state 1 of on, and during stable lighting (during phase advance), D1 = Off → Tr1: On → Tr1: Off→D2Nio7-el)2:Off→T
As the state of r2:on→Try:off→D1:on is repeated, the Fun 1 current IL flows. In addition, l! 2
In ao, so, the code Tr1. Tr2, Dl
, D2t-, but for example, the code Try is
During the period it shows, the transistor Trl in FIG. 1 is conducting, and the pond symbol Tr2. Dl, D
2 The same applies to VC.

However, when the resonance point is shifted to the phase advancing side, Dl:
.

OFF → Tr2: When turned on, the diode D1 has a reverse recovery time, and at this moment, a reverse current flows through the diode D2, passes through the diode Dlp and the transistor Tr2, and is supplied to the DC power source E1. Overcurrent flows from E2, and D2 flows in four ways.
: Off → Try : Transistor Trls even when on
? An overcurrent flows through the transistors Try and Tr2 sap due to these overcurrents.
and diode D1. D2 may be destroyed.

Furthermore, due to the above-mentioned overcurrent, transistor Tr1. Tr2 and diode D1. Power loss of D2 is large. Furthermore, when the emitter of the discharge lamp LA wears out, there is also the barrier that saturation of the Narark coil L occurs due to high voltage. Note that during stable lighting, the diode D1. D2
The reverse recovery time is not an issue.

Therefore, the object of the present invention is to
It is an object of the present invention to provide a discharge lamp lighting device capable of reducing lamp current when the ivy is exhausted.

A discharge lamp lighting device according to an embodiment of the present invention includes a choke coil Lj? and the value of the resonance start spinning capacitor C [aSS of the output of the square wave inverter IN1, for example, is set to resonate at the 3rd harmonic, and the other configurations are the same as those in Figure 1.

This discharge lamp lighting device uses the Naraku coil L's at the time of starting spinning.
? ! and resonance starting capacitor Cl conducts and discharges fan 7L.
A filament f1. Square wave input to f2-II
A preheating lamp current 1XJk that resonates with the 311th wave of the output of N1 is passed through the coil, and the 111th wave of the resonance starting capacitor C1 is applied. Due to J31I wave resonance (5
) The starting high voltage km is the discharge lamp LAt #IFI, and the starting mii is the inductance t of the choke coil L.
As a result, a current IIJt for lighting the discharge lamp LAK is applied to stably light the discharge lamp LAt.

The 33rd prisoner is the square wave inz (
JF INK ID output voltage vLtDfII type is shown,
Figure 3 shows the curves of the lamp current ■L at the time of lQ#i starting (advanced phase) and stable lighting (late phase R), respectively.
7-* Tr2; ON→Tr2: The OFF state is repeated, so that the lamp 1 current Ip flows, and during stable lighting, the lamp 2 current IL flows as in the conventional case.

In this construction, this lamp current 11-1 resonates with the 311ff of the output of the square wave inverter IN1 at the beginning of the cycle.
nt-flow, so a large current will not flow as this ramp tffilL (t'L is l because the 3rd wave component is small compared to the fundamental wave, T ), as a result, in order to suppress the lamp current at 111 J (6) in the conventional example to an appropriate value, the resonance point is phase-advanced.
It is no longer necessary to shift K, and the transistor Tr, 'r
r2 and diode D1. There is no possibility that an overcurrent will flow through D2, resulting in increased loss or damage. Furthermore, since the current is smaller and the frequency is higher than in the case of the fundamental wave, saturation will not occur even if a high voltage is applied to the tick coil. Furthermore, the filament current decreases after the lamp is turned on.

In addition, the check coil L and the resonance starting capacitor C
Even if the resonance point of IK: is shifted slightly to the phase slower side than the frequency of the third harmonic, IClff is produced in the same way. Also, in the *example, we tried to make the third harmonic resonate, but with just this, Hiko
It is also possible to cause resonance to other odd harmonics included in the square wave.

The following table shows numerical examples for comparison between the conventional example and the tame example. However, v2 is the lamp voltage, ILA is the lamp current, If is the preheating current, and ω is the angular frequency.

A practical example of this invention is shown in Figure 4. That is, this discharge lamp lighting device has an oscillation transformer Tt with a lead-beak leakage. A starting capacitor C11 is connected between one end t of a pair of filaments fl and f2 of the discharge lamp LA and the other ends of a pair of filaments f1 and f of the discharge lamp LA, respectively; The values of the leakage inductance of the oscillation transformer T, the capacitor C2's?, and the resonance starting capacitor C1 are set so as to resonate with the harmonic of the output of the inverter IN2, for example, the third harmonic of fJ.In this case, the inverter IN2't?)?7 register Tr1.Tr2
, an oscillation transformer T and a resonant capacitor C3, and transistors Tr1. By making Tr2k'Z conductive with each other, a high voltage wave is induced on the secondary side of the oscillation transformer T. Since this oscillation transformer T is of a lead beak type, the secondary side is saturated when the primary side induced voltage exceeds a certain value.

Figure 5 IAI, β) shows all the waveforms of the primary side induced voltage and secondary side induced voltage of the oscillation transformer T, respectively, and ■8 shows the waveforms of the secondary side induced voltage, respectively.
The next side magnetic flux saturation voltage is shown. The secondary side saturation current 8E is
The fundamental wave contains odd harmonic components, and the content of the third harmonic component is particularly high.

Prisoner 63, @l and C1 are the secondary collar electromotive voltages, respectively.
The waveform of the fundamental wave Orobika third harmonic is shown in U.

This discharge lamp lighting device connects the secondary side of the oscillation transformer TD to the capacitor C2>resonance start 1 capacitor C1r (9) at the time of starting the discharge lamp LA.
A preheating fan 1 current that resonates with the third harmonic is passed through fl, 12, and a high voltage for starting is obtained by the third harmonic resonance, and the discharge lamp LAt#lll7 is then turned into the hoist shape 1 after the first spinning.
When the leakage inductance of the oscillation transformer T and the capacitor C1t are broken, a lamp current for phase-advanced lighting is caused to flow, and the discharge lamp LAt is stably lit.

Like the above-mentioned example, this wm example also resonates with the third wave, so it is possible to reduce the lamp current at the start and when the emitter is exhausted. In addition, since a lead beak type oscillation transformer Tt is used, the output of the inverter IN2 is WIj3 tone l! It contains a lot of l component, and the lamp start @J
K: Necessary high voltage can be obtained easily, sufficient preheating current can be obtained, and 3rd harmonic component can be contained by selecting the primary/secondary turns ratio of the oscillation transformer T and the secondary side saturation voltage. The rate and peak value can be set arbitrarily, and the voltage required for the pump starting VC, the value of the preheating current, etc. can be arbitrarily set, and the circuit setting is easy.

(10) In the first embodiment, since the content rate of the third wave is fixed at 1 -H4, it is impossible to add width t to the design other than changing the power supply voltage.

In addition, since the oscillation transformer T is a lead beak type,
The output value of inverter N2 can be significantly lower than the peak value.

In addition, since a capacitor fC2 is inserted and the lighting is carried out in advance of the phase, it is less affected by the power supply and has good lighting characteristics.
The ratio of the 8 sides of the inverter N2 can be brought close to 1, and the efficiency of the inverter N2 can be increased. In addition, since the phase-advanced lighting is zero, the oscillation frequency can be made higher when no load is on than when the light is on, and the oscillation transformer T can be designed to be smaller. The problem is that the oscillation frequency becomes larger when the oscillation frequency is on than when it is on, and the oscillation transformer T needs to be designed to match the no-load condition, that is, it needs to be designed with the same low wave number. was there.

ζ Note that the oscillation transformer T may be of a simple lead-beam type rather than a lead-peak leakage type, and a chink coil may be added separately as a stabilizer. In addition, the capacitor C2 may be removed to allow a slow-phase lighting current to flow. In this case, the values of the leakage inductance of the oscillation transformer T and the value of the oscillation starting power supply fC may be set to IIa harmonics or other harmonics. Just set it so that it resonates with the waves.

As described above, the discharge lamp lighting device of the present invention connects one end of each of the pair of filaments of the discharge lamp to the pair of output ends of the inverter via the discharge lamp ballast, and A discharge lamp lighting device in which a resonant starting impedance is connected between the other ends of the discharge lamp ballast and the resonant starting impedance are set to KWk so as to resonate with harmonics of the output of the inverter. Therefore, there is an effect that the lamp current at the time of startup and at the time of emitter consumption can be reduced.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of Jukane's discharge lamp lighting device, 23rd prisoner, (
B1. The waveform diagram in the second example of improved OFi, Figure 53. @, C; is the waveform diagram in the embodiment of this invention VC: &- Figure 4 is the circuit diagram of the embodiment of the pond in this invention, Figure 53 .■ and 6'FgCA1.(2), 0d are waveform diagrams of each part.・Discharge lamp, IN2...in/(-ta, C2...capacitor) Customer (13) Figure 1 Figure 2

Claims (1)

[Scope of Claim]
In a discharge lamp lighting device in which a resonance starting impedance is connected to the other end WIR of each of the pair of filaments of the discharge lamp, the value of the 1115 discharge lamp ballast and the resonance starting impedance tlfffi is adjusted to the output of the inverter. A discharge lamp lighting device characterized by being set to resonate with waves. (211113 The inverter is a lead peak type oscillation transformer.