JPS5826634B2 - Flat Lamp Tent Usouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flash lamp lighting device used, for example, in a light emitting device for excitation of a solid-state laser, and particularly relates to a flash lamp lighting device that controls the lighting of a pair of flash lamps alternately by periodically applied trigger pulses. This invention relates to a flash lamp lighting device.

As a conventional flashlamp lighting device of this kind, a first flashlamp and a capacitor are connected in series to a DC power supply, and a second flashlamp is connected in parallel to the capacitor, so that the first trigger point is One idea is to use the trigger pulse to light the first flash lamp, and the next trigger pulse to discharge the charge in the capacitor to the second flash lamp, thereby lighting the second flash lamp. There is.

However, in the conventional device with the above configuration, when charging the capacitor with charge through the first flash lamp, if there is a charge remaining in the capacitor, sufficient voltage may not be applied between the anode and cathode of the first flash lamp. As a result, the first flash lamp cannot be lit properly.

Furthermore, if the capacitor is insufficiently charged, it becomes difficult to turn on the second flash lamp by the next flash lamp.

Therefore, there was a drawback that stable and reliable alternate lighting could not be performed.

The present invention was made in consideration of these circumstances, and its purpose is to provide a flash lamp lighting system with a simple configuration that can stably and reliably alternately light a pair of flash lamps by periodically applied trigger pulses. The purpose is to provide equipment.

Hereinafter, details of the present invention will be clarified by examples shown in the drawings.

In FIG. 1, reference numeral 1 denotes a DC power source consisting of an AC power source rectified by a rectifier or a battery.

A first flash lamp 3 and a first capacitor 4 are connected in series to this DC power supply 1 via an inductance element 2 as a ballast.

Connected in series to both ends of the capacitor 40 are an inductance element 5 as a ballast, a diode 6 having the illustrated polarity, that is, a forward polarity with respect to the power source, and a second flash lamp 7.

A second capacitor 8 is connected in parallel with the second flash lamp 7.

A point N where one end of the second capacitor 8, one end on the anode side of the second flash lamp I, and one end on the cand side of the diode 60 are connected, and one end M on the positive side of the DC power supply 1. A second capacitor 8 is connected between
A charging resistor 9 for charging is connected.

The second capacitor 8 used has a significantly smaller capacity than the first capacitor 4.

Further, when a trigger pulse is applied to the second flash lamp 7, the second capacitor 8 is charged to a voltage that can cause the lamp 7 to start discharging.

The first and second flash lamps 3 and 7 are flash discharge lamps such as xenon lamps, and their trigger electrodes 3 a and 7 a are connected to the output end of a trigger pulse generator 10 .

The trigger pulse generator 10 is configured, for example, to send out high-voltage trigger pulses at regular intervals.

Next, the operation of the apparatus constructed as described above will be explained with reference to the waveform diagram of FIG. 2.

First, considering the state in which the trigger pulse generator 10 is operating LTh'&, in this state, the DC current from the DC power supply 1 flows into the second capacitor 8 via the charging resistor 9.

Therefore, the capacitor 8 is charged to the polarity shown.

The charging voltage VC2 of the capacitor 8 in this charged state is applied to both ends of the second flash lamp 70, but since the flash lamp 7 will not start unless a tri-force pulse is applied, the above state continues as it is. .

Therefore, we now operate the trigger pulse generator 10 and
As shown, at time tl, t2. At t3..., trigger pulses PI, P2. P3... is sent out.

Then, the first. Second flash lamp 3 and 7
lights up alternately and emits flashes as described below.

That is, it is assumed that the first trigger force pulse P1 is applied to the valley trigger electrodes 3as 7a of the first and second flash lamps 3.7.

Then, since the first flash lamp 3 has the DC voltage of the current power source 1 applied to both ends thereof via the inductance element 2 and the capacitor 4, it starts to light up and emits a flash of light with a waveform as shown in FIG. 2B. emanate.

At this time, the current flowing through the first flash lamp 3 becomes a charging current to the first capacitor 4.

The first capacitor 4 is therefore charged as shown in FIG. 2C.

Charge voltage VC of the capacitor 4 in the charging completion state
I varies depending on the size of the inductance element 2, the output impedance of the power supply, etc., but is generally slightly lower than the power supply voltage (2).

On the other hand, since the second flash lamp 7 is in a state where the charging voltage VC2 of the second capacitor 8 is applied to both ends thereof, it starts when the trigger pulse PI is applied to its trigger electrode 7a at time t1. , the charge in the capacitor 8 is discharged.

However, since the capacitance of the second capacitor 8 is small, the discharge of the charge is carried out in an extremely short period of time as shown in FIG. 2E.

Therefore, the second flash lamp 7 momentarily emits light as shown in the second diagram, but the amount of light is very small, and the insulation is restored immediately thereafter, which is essentially the same as not lighting up.

Therefore, a part of the charging current to the first capacitor 4 described above passes through the inductance element 5 and the diode 6 to the second capacitor 4.
It does not flow into the flash lamp 7.

Therefore, it is only the first flash lamp 3 that substantially emits a flash of light in response to the first trigger pulse P1.

However, after this, the voltage across the first capacitor 4 is
As described above, C1 remains charged by the current at the time of starting and lighting the first flash lamp 3 to a voltage slightly lower than the power supply voltage (2) as shown in FIG. 2C.

Further, after the second capacitor 8 momentarily discharges its charge, it is subsequently supplied with DC from the DC power supply 1 via the charging resistor 9, so that it is gradually charged at a predetermined time constant as shown in FIG. 2E. Return to initial state.

Next, at time t2, it is assumed that the second trigger pulse P2 is sent out from the trigger pulse generator 10.

In this case, since the first capacitor 4 of the first flash lamp 3 is in a charged state, a voltage of a sufficient magnitude is not applied between the anode and the cathode, and the first flash lamp 3 does not start.

On the other hand, the second flash lamp T is connected to the second capacitor 8.
is in a charged state, and sufficient voltage for starting is applied between its ends, that is, between the anode and the cathode, so it starts discharging.

However, since the capacitance of the second capacitor 8 is extremely small as described above, the energy stored in the capacitor 8 alone is not enough to cause the second flash lamp 7 to emit flash light.

However, once the second flash lamp 7 enters the discharge start state, its impedance decreases.

When the voltage between the anode and the cathode becomes lower than the charging voltage C1 of the first capacitor 4, charge subsequently flows from the capacitor 4 into the flash lamp T.

Looking at this phenomenon from the potential relationship of the capacitors, when the voltage VC2 across the second capacitor 80 reaches a level L or lower, which is lower than the voltage VCI across the first capacitor 4, the first capacitor, which had been in a charged state until then, The charge on the capacitor 4 flows into the second flash lamp 7 via the inductance element 5 and the diode 6.

Therefore, the second flash lamp 7 is started and lit, and the second flash lamp 7 is turned on.
A flash of light is emitted as shown in the diagram.

As a result, only the second flash lamp 7 emits flash light in response to the second trigger pulse P2.

As a result, the voltage across the first capacitor 40 C1 becomes almost zero as shown in FIG. 2C, and the voltage VC2 across the second capacitor 7 once becomes zero as shown in FIG. 2E.
Charging is performed again via the charging resistor 9.

At time t3, when the third trigger pulse P3 is sent out from the trigger pulse generator 10, the second flash lamp 7 charges the second capacitor 8 in the same way as when the first trigger pulse P1 was sent out. After instantaneously discharging the load, the insulation is restored, the first flash lamp 3 is turned on, and the first capacitor 4 is charged.

Thereafter, the above-described operation is repeated every time a trigger pulse is supplied.

In addition, although the case where the second capacitor 8 is charged by the DC power supply 1 has been described in the above-mentioned embodiment, it may be charged by a separate power supply.

In addition, although the first flash lamp and the second flash lamp have been shown as an example in which single flash lamps are arranged in pairs, for example, a set of multiple parallel-connected flash lamps may be arranged in pairs. It's okay.

Further, in the embodiment, the trigger pulse from the trigger pulse generator 10 causes the first and second flash lamps 3 and 7 to be activated.
Although a case has been described in which the trigger is configured to be externally triggered, a series injection type trigger method may also be adopted.

Further, in the above embodiment, a xenon lamp is used as a flash lamp assuming that the present invention is applied to a light emitting device for excitation by a solid state laser, but other flash discharge lamps may also be used.

As explained above, the present invention connects a first flash lamp and a first capacitor in series to a DC power supply, and connects a second flash lamp in parallel to the first capacitor through a diode in the forward direction. A second capacitor of minute capacity is connected in parallel to this second flash lamp, and this second capacitor is charged by a charging circuit to a voltage at which the second flash lamp can start discharging when the second flash lamp is triggered. It is configured to be charged.

Therefore, according to the present invention, the charge voltage of the first capacitor charged when the first flash lamp is lit discharges the second flash lamp when the trigger pulse is applied to start and light the second flash lamp. Even if the voltage level is below the level at which the second flash lamp can be started, the charging voltage of the second capacitor is sufficient to start discharging the second flash lamp, so the second flash lamp can be reliably started. It can be turned on.

Further, according to the present invention, the charge of the first capacitor is sufficiently discharged when the second flash lamp is turned on, so that when the first flash lamp is triggered by the next trigger pulse, the first A sufficiently large voltage will be applied to both ends of the flash lamp No. 1.

Therefore, lighting of the first flash lamp can also be performed reliably.

As described above, according to the present invention, it is possible to provide a flash lamp lighting device with a simple configuration that can stably and reliably alternately light a pair of flash lamps by periodically applied trigger pulses.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the operation of the embodiment. 1.-'-...DC power supply, 2,5...Inductance element, 3.7...First and second flash lamps, 4.8......No. 1. Second capacitor, 6... Diode, 9... Charging resistor, 10... Trigger pulse generator.

Claims (1)

[Claims] 1 @ current power supply and the first
a flash lamp and a first capacitor, a second flash lamp connected in parallel to the first capacitor via a diode in the forward direction, and a second microcapacitor connected in parallel to the second flash lamp. A flash lamp lighting device comprising: a capacitor; and a charging circuit that charges the second capacitor to a voltage at which the second flash lamp starts discharging when the second flash lamp is triggered.