JPH01282529A - Dimming type stroboscopic device - Google Patents

Abstract

PURPOSE:To shorten time required for emitting flash light and to improve dimming accuracy by applying an IGMT whose collector current is great and whose switching speed is low in order to switch a flash discharge tube. CONSTITUTION:An energy accumulating capacitor 30 is charged by a high voltage DC power source 20 of about 300V, and a trigger capacitor 602 is charged through the primary coil of a trigger transformer 601. At that time, the voltages of the capacitors 30 and 602 come to about 300V similar to the power source 20. By outputting a voltage signal V1 to an IGBT control circuit 800 from a flash start signal source 90, the control circuit 800 starts supplying a gate voltage VGE to an IGBT 500, which is rapidly turned off by the supply of the voltage VGE. Then, a voltage VCE across the collector and emitter of the IGBT 500 amounts to a value close to zero. Since the control circuit 800 keeps supplying a gate voltage to the IGBT 500, the flash discharge tube 10 flashes stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dimming type strobe device, and more particularly, to an improvement of a dimming type strobe device that can adjust the amount of flash.

[Conventional technology]

FIG. 3 shows the circuit connection configuration of this type of dimming strobe device according to a conventional example, and the voltage waveform and current waveform of the main part of the same circuit are shown in FIGS. 4(A) to (D) and (E).
), and in this Figure 4 (A) or 0), the vertical axis is voltage and the horizontal axis is elapsed time, and in the same figure (E), the vertical axis is current and the horizontal axis is elapsed time, respectively. It is shown in

That is, in the circuit configuration of the conventional device shown in FIG. 3, reference numeral 1O indicates anodes 10a at both ends.

A flash discharge tube that emits flash light, which is provided with a cathode TAB and a trigger electrode 10c surrounding a part of the outer peripheral surface of the tube wall;
20 is a high voltage DC power supply with a voltage of about 300V, 30
40 is an energy storage capacitor connected between the positive and negative electrodes of the high voltage DC power supply 20 to store energy for generating flash light from the flash discharge tube 1O, and 40 is connected to one terminal of the energy storage capacitor 30. and the other terminal is connected to the positive terminal side of the high voltage DC power supply 20, and the other terminal is connected to the flash discharge tube I.
A choke coil 41 connected to the anode 10a side of O,
It is composed of a diode 42 whose cathode is connected to the energy storage capacitor 30 side of this choke coil 41 and whose anode is connected to the anode +Oa side of the flash discharge tube 10 of the choke coil 41. 50 indicates a current limiting circuit, in which the anode is connected to the cathode 10b side of the flash discharge tube 10, and the cathode is connected to the energy product capacitor 3.
0 and the negative electrode side of the high-voltage DC power supply 20, and the energy stored in the capacitor 30 is transferred to the flash discharge tube! This is a high-speed switching thyristor for supplying 0.

Further, 60 is a discharge tube trigger circuit for triggering the flash discharge tube lO, and 61 is a discharge tube trigger circuit for triggering the flash discharge tube lO.
62 is a trigger capacitor whose one terminal is connected to the other terminal of resistor 61, and 63 is a trigger capacitor with both terminals of the primary winding connected to the positive side of the high voltage DC power supply 20. The other terminal of the capacitor 62 is connected to the energy storage capacitor 30 and the negative electrode side of the high voltage DC power supply 20, and both terminals of the secondary winding are connected to the trigger electrode 10c of the flash discharge tube 10 and the same cathode 10b.
Trigger transformer 64 connected to the trigger thyristor 64 having an anode connected to the resistor 61 side of the trigger capacitor 62 and a cathode connected to the energy storage capacitor 30 and the negative electrode side of the high voltage DC power supply 20; is a gate resistance connected between the gate and cathode of this trigger thyristor 64.

Furthermore, 70 is a commutation circuit that temporarily applies a reverse voltage between the anode and cathode of the high-speed switching thyristor 50 to commutate the voltage, and 71 is a commutation circuit that connects the anode to the flash discharge tube through a resistor 72. 10 is connected to the anode 10a of the high-speed switching thyristor 50, the commutation thyristor is connected to the anode of the high-speed switching thyristor 50 through a commutation capacitor 73, and the cathode is connected to the cathode of the high-speed switching thyristor 50, and 74 is the high-speed switching thyristor. 50 a resistor connected between the anode and cathode; 75 the gate of the high-speed switching thyristor 50; a gate resistor 76 connected between the cathode; 76 and 77 the anode of the commutation thyristor 71 and the gate of the high-speed switching thyristor 50; A capacitor and a resistor 78 and 79 are connected in series between the anode of the high-speed switching thyristor 50.

A capacitor and a resistor connected in series between the cathodes.

Further, 80 has a light-receiving element sensitive to the flash light (arrow L in the figure) emitted from the flash discharge tube 10, and is connected between the gate and cathode of the planar commutation thyristor 71,
A flash amount setting circuit outputs a voltage pulse between the gate and cathode of the commutation thyristor 71 when the amount of flash emitted from the flash discharge tube IO reaches a predetermined value. A flash start signal source, such as a camera, which is connected between the gate and the cathode and outputs a voltage signal for starting flash generation in the flash discharge tube 10 between the gate and the cathode of the trigger thyristor 64. be.

Next, the operation of the circuit device in this conventional example will be described.

First, a high voltage DC power supply 20 with a voltage of about 300V
, the energy storage capacitor 30 is charged to the polarity shown, and the resistor 61 and the trigger river transformer 63 are charged.
The trigger capacitor 62 is connected to the choke coil 41 through the primary winding. A commutating capacitor 73 is connected through resistors 72 and 71, and a choke coil 41. Resistors 72 and 75
．． 77 to charge the capacitors 76 to the polarities shown. At this time, each of these capacitors: 10,6
The voltages of 2.73 and 76 are about 300V, which is the same as that of the high voltage DC power supply 20.

Then, the trigger thyristor 6 is connected from the flash start signal source 90.
4, the trigger thyristor 64 is turned on by outputting a voltage signal V as shown in FIG.
The charges accumulated in the trigger thyristor 64. and the primary winding of the trigger transformer 63, and between both terminals of the secondary winding of the trigger transformer 63 as shown in FIG.
A high frequency high voltage pulse (2) as shown in B) is generated.

Then, the high frequency high voltage pulse v2 is the flash discharge tube I
Since it is applied between the O trigger electrode 10c and the cathode 10b, this high-frequency high-voltage pulse v2 ionizes the gas sealed in the flash discharge tube 10, causing both types of %IOa and IO
As the impedance between b gradually decreases, the voltage between the anode and cathode of the high-speed switching thyristor 50 increases, and at the same time, each capacitor 73.76 and resistor 75.77 connected between the anode and cathode As shown in FIG. 4(C), the gate voltage v3 between the gate and cathode of the high-speed switching thyristor 50 increases in the forward direction by the differentiating circuit consisting of the high-speed switching thyristor 50.
is turned on, and the series circuit of the flash discharge tube IO and the high-speed switching thyristor 50 becomes conductive.

Then, by turning on the series circuit of the flash discharge tube 10 and the high-speed switching thyristor 50, the energy '
The charge stored in the BhI capacitor 30 is transferred from the energy H&'l capacitor 30 to the choke coil 41. Flash discharge tube 10. is discharged in a closed circuit that returns to the energy storage capacitor 30 via the high-speed switching thyristor 50, and by this discharge, the flash discharge tube 10
A large discharge current Td of about 200 V as shown in FIG. 4(E) flows inside, and a flash is emitted from this flash discharge tube IO. Note that the time td in FIG. 4(E) is the activation delay time of the high-speed switching thyristor 50.

When the amount of flash emitted from the flash discharge tube IO reaches a predetermined value, a voltage pulse v4 shown in FIG. The output, this commutation thyristor 71 is turned on, and the electric charge stored in the commutation capacitor 73 causes the discharge current Id flowing in the high-speed switching thyristor 50 to be transferred between the commutation capacitor 73 and the commutation thyristor 71. This high-speed switching thyristor 5 is bypassed to the series circuit and starts to flow, and the discharge current 1d stops flowing to the high-speed switching thyristor 50 for a period of time (usually about several microseconds).
A reverse voltage is applied between the anode and cathode of the commutating thyristor 71. This discharge causes the gate voltage v3 between the gate and cathode of this high-speed switching thyristor 50 to also become a reverse voltage, as shown in Figure 7.4 (C). A reverse voltage is applied between the anode and the cathode, and the gate, +
While the gate voltage v3 between the 13 poles is a reverse voltage, this high-speed switching thyristor 50 recovers its forward blocking ability and shifts to the OFF state.

On the other hand, the discharge current 1d flowing inside the flash discharge tube lO is
The current continues to flow until the commutating capacitor 73 is charged with the polarity opposite to the initial polarity, and is cut off with a waveform as shown in FIG. 4(E).
As a result, the flash emission of the flash discharge tube IO is stopped, and at the same time, the commutation thyristor 71 is turned off.

Here, the time Ld2 in FIG. 4(E) is the activation delay time of the commutating thyristor 71, and the time LC is the charging time of the commutating capacitor 73 by the discharge current 1d.

As mentioned above, even after the discharge current rd stops flowing, the ions of the filled gas remain inside the flash discharge tube IO without disappearing for several tens of milliseconds. Therefore, the impedance between the picture electrode 10a and +Ob gradually increases, and this impedance is changed to the commutation circuit 7.
When the resistance becomes sufficiently large compared to the resistance 74 within 0,
The commutation capacitor 73 is connected to the choke coil 41° resistor 72 by the high voltage DC power supply 20. and 74, it is recharged to the initial polarity voltage.

However, if you try to operate the flash discharge tube 0 again before the commutation capacitor 73 is sufficiently recharged, the commutation capacitor 73 will not have enough charge, so the high speed will be reduced. switching thyristor 5
If sufficient reverse voltage application time cannot be given to 0 as described above, and the commutation of the high-speed switching thyristor 50 fails as a result, the flash emission of the flash discharge tube IO cannot be stopped, and the dimming function is lost. It turns out. In this one again,
The choke coil 41 of the current limiting circuit 40 suppresses a sudden increase in the current flowing out from the commutation capacitor 73 during commutation, lengthens the time for which reverse voltage is applied to the high-speed switching thyristor 50, and improves the commutation operation. It makes it easier.

[Problems to be Solved by the Invention] However, in the conventional device configured as described above, the high-speed switching thyristor 50 is used to perform the switching operation of the flash discharge tube 10. In order to effectively perform the optical function, the commutation circuit 70 is required.
．． and a commutation current limiting circuit 40, respectively, and this has the following disadvantages.

a) During the commutation of the high-speed switching thyristor 50, the discharge current rd flowing in the flash discharge tube IO continues to flow until the charging of the commutation capacitor 73 is completed. The amount of flash increases, and the accuracy of dimming is poor, especially when the amount of flash is small.

b) Since it is necessary to turn off the commutation thyristor 71 after commutation of the high-speed switching thyristor 50, there is a limit to increasing the recharging current to the commutation capacitor 73, and the flash discharge tube lO cannot be operated repeatedly at high speed.

C) The commutation circuit 70 for commutating the high-speed switching thyristor 50 has a large number of components, making the device smaller;
Furthermore, it is not easy to reduce manufacturing costs.

d) When the voltage of the high-voltage DC power supply 20 that charges the energy storage capacitor 30 is low, the activation delay time td of the high-speed switching thyristor 50 after the triggering of the flash discharge tube IO becomes long, reaching several tens of microseconds. Therefore, it is not easy to stably turn on the high-speed switching thyristor 50, and in order to stably emit flash light from the flash discharge tube lθ, the voltage of the high-voltage DC power supply 20 must be set to about 250V. The voltage must be maintained at a higher voltage.

This invention was made to solve these conventional problems, and its purpose is to use a transistor with a large collector current and short switching time to switch a flash discharge tube. This improves the dimming accuracy when the amount of flash is small, enables the flash discharge tube to operate repeatedly at high speed and low voltage, and also simplifies and downsizes the device configuration as much as possible, making it cheaper. Made it possible to manufacture. An object of the present invention is to provide a dimming type strobe device of this kind.

[Means for Solving the Three Problems] In order to achieve the above object, a dimmable strobe device according to the present invention includes a flash discharge tube that has an anode, a cathode, and a trigger electrode and emits flash light, and a flash discharge tube that emits flash light. An IGBT whose collector is connected to the cathode of the tube, a diode whose cathode is connected to the collector of the IGBT and an anode to its emitter, the positive side is connected to the anode of the flash discharge tube, and the negative side is connected to the emitter of the IGBT. a high-voltage DC power supply connected to the high-voltage DC power supply, an energy storage capacitor connected in parallel to the high-voltage DC power supply to store energy for generating flash light from the flash discharge tube, and a primary winding with one terminal connected to the cathode of the flash discharge tube. , and a trigger transformer each having a secondary winding having one terminal connected to the trigger electrode of the flash discharge tube and the other terminal connected to the cathode or anode of the flash discharge tube, and the trigger transformer. a trigger capacitor, one terminal of which is connected to the other terminal of the primary winding of the device, and the other terminal of which is connected to one of the terminals of the energy 4H1 capacitor;
A resistor with one terminal connected to the anode of the flash discharge tube and the other terminal connected to the cathode of the flash discharge tube either directly or through the primary winding of the trigger transformer, and between the emitter and gate of the IGBT. It has a flash amount setting circuit that is connected to the flash discharge tube and outputs a voltage pulse when the radiation meter of the flash discharge tube reaches a predetermined value, and a flash start signal source that outputs a voltage signal to start the flash generation of the flash discharge tube. In response to the voltage signal from the flash start signal source, the gate voltage is supplied to the IGBT, and in response to the voltage pulse from the flash amount setting circuit, the IGBT is supplied with a gate voltage.
The present invention is characterized in that it includes at least an IGBTJJ control circuit that stops supplying gate voltage to the BT.

[For production]

That is, in the device of this invention, the energy storage capacitor and the trigger capacitor are charged by the high-voltage DC power supply, and the IGBT is turned on according to the voltage signal from the flash start signal source to start the flash discharge tube. The voltage of the energy storage capacitor is applied between the electrodes, and the charge stored in the trigger capacitor is discharged through the secondary windings and IGBT of the trigger transformer, and the secondary 81 & A high-frequency, high-voltage pulse generated between the terminals of the flash discharge tube makes the flash discharge tube conductive and discharges the charge stored in the energy storage capacitor, and this discharge causes the flash discharge tube to emit a flash of light.

In addition, when the amount of flash emitted from the flash discharge tube reaches a predetermined value, the voltage pulse from the flash amount setting circuit controls the I
It is possible to turn off the GBT, cut off the discharge in the flash discharge tube, and stop the flash emission, and at the same time, the IG
The collector-emitter voltage of the BT is boosted to the terminal voltage of the energy storage capacitor through the flash discharge tube.
And the voltage on the trigger capacitor can also be charged through the primary winding of the trigger transformer.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dimming type strobe device according to the present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1 is a circuit connection diagram showing the general configuration of a dimming type strobe device to which this embodiment is applied, and FIGS. Waveform,
2(A) to 2(D), the vertical axis is the voltage, the horizontal axis is the elapsed time, and in FIG. 2(E), the vertical axis is the elapsed time. The current and the horizontal axis each indicate elapsed time.

In the embodiment apparatus shown in FIGS. 1 and 2, the same reference numerals as in the conventional apparatus shown in FIGS. 3 and 4 indicate the same or corresponding parts, and the explanation thereof will be omitted.

That is, in the circuit configuration of this embodiment shown in FIG.
It is a resistor connected between loa and IOb, and 500 is an IGB with a large collector current and short switching time.
T, its collector is connected to the cathode 10b of the flash discharge tube IO,
The emitter is connected to the negative electrode side of the energy storage capacitor 30 and the high-voltage DC power supply 20, and the flash discharge tube lO and the energy storage capacitor 30 form a closed circuit. A diode 501 having a cathode connected to the emitter side and an anode connected to the emitter side is arranged.

Further, 600 is a discharge tube trigger circuit for triggering the flash discharge tube 10, and 601 is a discharge tube trigger circuit for triggering the flash discharge tube 10, and 601 is connected to one terminal of each of the primary winding and the secondary winding to the flash discharge tube! 0 cathode 10b
Commonly connected to the flash discharge tube IO, the other terminal of its secondary winding
A trigger transformer 60 connected to the trigger electrode 10c of
2 is a trigger capacitor having one terminal connected to the other terminal of the secondary winding of the trigger transformer 601 and the other terminal connected to the emitter side of the IGBT 500.

Furthermore, 800 is connected between the emitter and gate of the IGBT 500, and a flash amount setting circuit 80. and a flash start signal source 90 to control the operation of the IGBT 500, and this IGBTfI
The 11 control circuit 800 has a function of supplying a gate voltage to the IGBT 500 when a voltage signal from the flash start signal source 90 is input manually, and a function of supplying a gate voltage to the IGBT 500 when a voltage pulse from the flash amount setting circuit 80 is input. , and has a function of cutting off the supply of gate voltage to the IGBT5QO.

Next, the operation of the circuit device in this embodiment will be described.

First, a high voltage DC power supply 20 with a voltage of about 300V
, the energy storage capacitor 30 is charged to the polarity shown, and the resistor +00 and the trigger transformer 6 are charged.
The trigger capacitor 602 is charged to the polarity shown through the primary winding of 01. At this time, the voltage of each of the stiff capacitors 30 and 602 becomes about 300 V, which is the same as the voltage of the high voltage DC power supply 20.

Then, the flash start signal source 90 outputs IGBTl! By outputting a voltage signal v1 as shown in FIG. 2(A) to the IJ control circuit 800, this IGBTJJg4 circuit 800
starts supplying the gate voltage VGE as shown in FIG. 2 (8) to the IGBT 500, and the IGBT 500 receives this gate voltage V. It is rapidly turned on by the supply of E,
Collector-emitter voltage VCE of this IGBT500
However, as shown in FIG. 2(C), the voltage value becomes small and can be considered as substantially zero.

Then, due to the rapid turn-on of the IGB 7500, the voltage of the energy storage capacitor 30 is applied between the picture electrode 10a and Sob of the flash discharge tube lO, and the electric charge stored in the trigger capacitor 602 is transferred to the trigger transformer. primary winding of the device 601, and the IGBT 500
A high frequency high voltage pulse v2 as shown in FIG. 2(D) is generated between both terminals of the secondary winding of this trigger transformer 601, and this high frequency high voltage pulse v2 , the trigger electrode 10c and the cathode l of the flash discharge tube lO
Since the high-frequency high-voltage pulse v2 is applied between the high-frequency and high-voltage pulses Ob, the gas sealed in the flash discharge tube IO is ionized.

At this time, the diode 501 is connected to the trigger transformer 601.
The inductance of the primary winding and the trigger capacitor 6
Due to the resonance phenomenon of the resonant circuit consisting of the capacitance of
value and lengthen the decay time of the high frequency high voltage pulse v2, the flash discharge tube 10 of this high frequency high voltage pulse v2 is
It plays a role in assisting the triggering action.

Furthermore, as described above, when the gas filled in the flash discharge tube IO is ionized by the high frequency high voltage pulse v2, from the time when the high frequency high voltage pulse v2 is applied to the flash discharge tube IO, as shown in FIG. After a delay time td3 shown in , the flash discharge tube 10 becomes conductive, and the charge stored in the energy storage capacitor 30 is transferred to the energy storage capacitor 30. Flash discharge tube 10. and IGBT5
00 in a closed circuit, and this discharge causes 20 in the flash discharge tube IO as shown in the same figure (E).
A large discharge current 1d of about 0 V flows, and a flash is emitted from the flash discharge tube IO.

However, at this time, for the IGBT 500, as shown in FIG. 2(B), the IGBT control circuit 800
As long as the gate voltage is continuously supplied from the IGBT 500, the IGBT 500 is reliably turned on, and the flash discharge tube IO can emit flash light extremely stably.

When the amount of flash emitted from the flash discharge tube IO reaches a predetermined value, the flash amount setting circuit 80 sends a voltage pulse having the same waveform as that shown in FIG. 4(D) to the IGBT control circuit 800. v4 is output, and this voltage pulse v4
Therefore, as shown in FIG. 2(B), the IGBT control circuit 800 stops supplying the gate voltage to the IGBT 500, and from the time when the gate voltage supply is stopped, the IGBT control circuit 800 stops supplying the gate voltage to the IGBT 500, as shown in FIG. 2(E). Delay time td shown in
4, the flash discharge tube IO shifts to the OFF state, and as shown in FIG. be done.

At this time, the collector-emitter voltage vcE of the IGBT 500, as shown in FIG. Storage capacitor 3
The voltage of the trigger capacitor 602 is increased by 1: to the same voltage as the terminal voltage of 0, and at the same time, the voltage of the trigger capacitor 602 is also instantaneously increased through the primary winding of the trigger transformer 602 due to this collector-emitter voltage VCE. It is charged to the same polarity voltage as before operation, and even if the flash discharge tube IO is emitted again immediately after the flash discharge tube IO stops emitting flash light, no problems will occur in its operation. do not have.

According to the inventor's experimental results, the delay time t,
d is when the voltage of the high voltage DC power supply 20 is 330v,
The time was approximately 5 μs. Similarly, the delay time d4 is 2 μs to 3 μs when the discharge current Id is 130 A.
Because of the high speed and speed, a sufficient improvement in dimming performance can be expected.

Therefore, in the case of this embodiment configuration, since the TGBT 500 is used to switch the flash discharge tube 10, the commutation circuit 70, commutation current limiting circuit 40, etc. as in the conventional configuration are used. is not required at all, and the following effects can be achieved.

a) Unlike the conventional configuration shown in FIG. 3, the current that charges the commutation capacitor 73 does not pass through the flash discharge tube IO, so the flash emission time can be shortened and the dimming accuracy can be improved. In particular, the accuracy of light control when emitting flash light with a small amount of light is improved, and for example, when this is applied to a camera, it is possible to realize extremely close-up photography.

b) It is extremely easy to repeat the flash emission operation of the flash discharge tube 10 at high speed.

C) Compared to the conventional example, the circuit configuration is significantly simplified, the number of component parts can be reduced, the device can be made smaller, manufacturing costs can be reduced, and reliability can be improved.

d) There is no power loss in the commutation circuit 70 in the conventional example,
Energy savings can be achieved, and together with a reduction in the number of high-voltage components, ultra-high-density packaging is possible, and, for example, light control in a strobe device with a built-in camera is facilitated.

In the configuration of the above embodiment, both terminals of the resistor are connected to the picture electrode of the flash discharge tube, but it is not necessary to connect them in this way, and both terminals of the resistor are connected to the anode of the flash discharge tube and They may be connected to the connection points between the primary winding of the trigger transformer and the terminal of the trigger capacitor, and the diode may be connected externally to the IG as a component.
Although it is connected to the BT, it is not necessarily necessary to connect it in this way, and it is also possible to integrate this diode into the IGBT board. In this case, the number of external components can be reduced. can be reduced.

Furthermore, in this embodiment, one terminal of the trigger capacitor is connected to the primary winding of the trigger transformer, and the other terminal is connected to the energy storage capacitor and the negative pole side of the high voltage DC power supply. It is not necessary to connect them in this way; as long as they have good high-frequency characteristics, they may be connected to the positive side, and both terminals of the secondary winding of the trigger transformer can be connected to the cathode of the flash discharge tube, and Although they are each connected to the trigger electrode, it is not necessary to connect them in this way, and they may be connected to the anode of the flash discharge tube and the trigger electrode, respectively.

Further, in this embodiment, an IGBT is used for the switching operation of the flash discharge tube, and it is conceivable that a bipolar type transistor may be used instead, for example, but in this case.

Compared to bipolar transistors, IGBTs are voltage-driven, which makes them easier to control, and the switching speed can be increased, which further improves dimming accuracy and allows handling per m chip area. Since the current value can be increased, it has the advantage of allowing the use of relatively small chips.

〔Effect of the invention〕

As detailed above, according to the dimming type strobe device of the present invention, in order to switch the flash discharge tube,
Since the collector current is very high and the IGBT with short switching speed is used, there is no need to use a commutation circuit or a commutation limiting circuit as in conventional examples.
As a result, the flash emission time can be effectively shortened, the dimming accuracy is significantly improved, and the flash emission operation of the flash discharge tube can be performed repeatedly at high speed. In addition, the circuit configuration can be extremely simplified, and as the number of component parts is reduced, the entire device can be made smaller and manufacturing costs can be reduced, which helps improve reliability. This type of self-extinguishing IGB can sufficiently reduce the voltage that can be radiated, and there is no power loss in the commutation circuit as in conventional examples.
Since the T is driven by voltage, it is extremely easy to control, and the driving current is small, so it has excellent features such as being able to achieve energy saving.

[Brief explanation of the drawing]

FIG. 1 is a circuit connection diagram showing a general configuration of a dimming type strobe device to which an embodiment of the present invention is applied, and FIGS. 2 (A) to (D) and (E) are voltage waveforms of the main parts of the same circuit. , and an explanatory diagram showing current waveforms; FIG. 3 is a circuit connection diagram showing a general configuration of the dimming type strobe device according to the conventional example; FIGS. 4(A) to 4(E) FIG. 2 is an explanatory diagram showing voltage waveforms and current waveforms of the main parts of the same circuit. 10...Flash discharge tube, IOa...Anode same as above, 1
0b...Cathode as above, Inc...Trigger electrode as above, 20...High voltage DC power supply, 30...Energy storage capacitor, 80...Flash amount setting circuit, 81...
... Light receiving element, 90 ... Flash start signal source, 100
...Resistance, 500...IGBT, 501...
...Diode, 600...Discharge tube trigger circuit, 6
01...Trigger transformer, 602...Trigger river capacitor, 800...IGBT control circuit. Agent Masuo Oiwa Figure 2 Figure 4

Claims (1)

[Claims] A flash discharge tube that has an anode, a cathode, and a trigger electrode and emits flash light, an IGBT whose collector is connected to the cathode of the flash discharge tube, and a diode whose cathode is connected to the collector of the IGBT and an anode to the emitter of the IGBT. and a high-voltage DC power supply whose positive electrode side is connected to the anode of the flash discharge tube and whose negative electrode side is connected to the emitter of the IGBT, respectively, and an energy storage device connected in parallel to the high-voltage DC power supply to store the energy for flash generation of the flash discharge tube. a primary winding with one terminal connected to the cathode of the flash discharge tube, one terminal connected to the trigger electrode of the flash discharge tube, and the other terminal connected to the cathode or anode of the flash discharge tube. A trigger transformer each having a connected secondary winding, one terminal connected to the other terminal of the primary winding of the trigger transformer, and one terminal connected to either terminal of the energy storage capacitor to the other terminal. A trigger capacitor with terminals connected, one terminal connected to the anode of the flash discharge tube, and the other terminal connected to the cathode of the flash discharge tube either directly or through the primary winding of the trigger transformer. A flash amount setting circuit that is connected between the resistor and the emitter gate of the IGBT and outputs a voltage pulse when the amount of flash emitted from the flash discharge tube reaches a predetermined value, and a voltage signal for starting the flash generation of the flash discharge tube. It has a flash start signal source that outputs I, receives a voltage signal from the flash start signal source, and outputs I
A dimming type characterized by comprising at least an IGBT control circuit that supplies a gate voltage to the GBT and stops supplying the gate voltage to the IGBT upon receiving a voltage pulse from a flash amount setting circuit. Strobe device.