JP2975478B2 - High frequency flashing type dimmable strobe device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimming type flash device, and more particularly to an improvement of a high frequency flashing type dimming type flash device capable of flashing at a high frequency and adjusting a flash light amount.

[0002]

2. Description of the Related Art A conventional high-frequency flashing type dimming strobe device will be described with reference to FIGS. FIG. 5 is a circuit diagram showing a configuration of a conventional high-frequency flashing type dimmable strobe device.
FIG. 6 is a circuit diagram showing a part of an IGBT (insulated gate bipolar transistor) driving circuit constituting a high-frequency signal source, and FIGS. 7A to 7E show voltages and currents of main parts of the circuit of FIG. It is a figure showing a waveform. FIGS. 8A to 8C are perspective views showing a state in which two IGBTs constituting a conventional high-frequency flashing type dimming strobe device are mounted on a substrate, and wiring of the IGBTs on the front and back sides of the substrate at this time. FIGS. 9A and 9B are diagrams showing pattern examples, and FIGS. 9A and 9B are diagrams showing turn-off waveforms of one IGBT in the case of mounting in FIGS. 8A to 8C.

In FIG. 5, reference numeral 10 denotes a high-voltage DC power supply having a voltage of about 300 V, and reference numeral 20 denotes an energy storage connected between the positive electrode and the negative electrode of the high-voltage DC power supply 10 for storing energy for generating a flash of a flash discharge tube. Capacitor, 30
Is a discharge current limiting circuit; 40 is a flash discharge tube which emits flash light provided with an anode 40a and a cathode 40b at both poles and a trigger electrode 40 surrounding a part of the outer peripheral surface of the tube wall; The resistor is connected to the anode 40a of the discharge tube 40 and the other end is connected to the cathode 49b. The discharge current limiting circuit 30 includes a choke coil 31 having one terminal connected to the positive electrode of the energy storage capacitor 20 and the high-voltage DC power supply 10 and the other terminal connected to the anode 40a of the flash discharge tube 40; Is connected to the energy storage capacitor side of the choke coil 31 and the diode 32 whose anode is connected to the anode 40a side of the flash discharge tube 40 of the choke coil 31.
Limit 0 discharge current.

Further, reference numeral 600 denotes a flash discharge tube trigger circuit for triggering the flash discharge tube 40; 61, a trigger transformer;
2 is a trigger capacitor. The trigger transformer 61 connects one terminal of the primary winding to the other terminal of the trigger capacitor 62, connects the other terminal of the primary winding to the other terminal of the secondary winding, and Both terminals of the secondary winding are connected to the trigger electrode 40c of the flash discharge tube 40 and the negative electrode of the high-voltage DC power supply 10. 601 is a thyristor for trigger, 602 is a resistor connected in series to the gate terminal of the thyristor 601 for trigger, 603 is a resistor connected between the gate and cathode of the thyristor 601 for trigger, 604 is an anode of the thyristor 601 for trigger. And a capacitor connected to one terminal of a resistor 605 connected to the anode of the diode 70, a resistor 606 for limiting charging of the trigger capacitor 62, and a trigger 610 for overcharging the main capacitor or a flash start switch. Supply a trigger pulse to the gate of the thyristor 601 and a high-frequency signal source 2
It is a flash start signal source having a function to notify the start of flash at 00. The trigger thyristor 601 is connected to the flash start signal source 6
The trigger capacitor 62 is discharged by a voltage pulse of 10 or more.

Reference numeral 130 denotes a light receiving element that responds to flash light (arrows shown) emitted from the flash discharge tube 40, and 110 has a light receiving element 130, and the amount of flash light emitted from the flash discharge tube 40 becomes a predetermined value. A flash light setting circuit that outputs a signal pulse when the light reaches the light source. A flash light setting circuit 110 and a flash start signal pulse output an IGBT 81 and an IGBT 82.
Is a high-frequency signal source that outputs a voltage pulse having a period of up to about several tens of kHz between the gate and the emitter.

Reference numeral 70 denotes a diode having an anode connected to the cathode 40b of the flash discharge tube 40 and a cathode connected to the collectors of the IGBTs 81 and 82. Numerals 81 and 82 connect the collectors to the cathode of the diode 70 and the emitters to the energy storage capacitor 20 and the negative electrode of the high-voltage DC power supply 10, respectively, and supply the energy stored in the energy storage capacitor 20 to the flash discharge tube 40. I to do
GBT and 93 are resistors connected to the gates of IGBTs 81 and 82.

In FIG. 6, 205 and 208 are NPN transistors, 207, 209 and 210 are resistors, and 206 is a diode. The terminals 201 and 202 are connected to the other ends of the resistors 93 connected to the gates of the IGBTs 81 and 82 and the emitters of the IGBTs 81 and 82 shown in FIG.

[0008] In FIG. 7 (A) ~ (E) , the voltage V _11a, V _11b start signal outputted from the flash initiation signal source, voltage V ₁₂ is a voltage pulse outputted from the trigger transformer, the voltage V ₁₄ Is the voltage applied from the high frequency signal source to the gate of the IGBT, voltage _VCE is the collector-emitter voltage of the IGBT, and current _Id is the discharge current of the flash discharge tube. 7A to 7D, the vertical axis represents voltage and the horizontal axis represents elapsed time. In FIG. 7E, the vertical axis represents current, and the horizontal axis represents elapsed time.

8A to 8C, 81 and 82 are IGBTs, 83 and 88 are gate terminals, 84 and 87 are collector terminals, 85 and 86 are emitter terminals,
83a and 88a are gate terminal insertion holes, 84a and 8
7a is a collector terminal insertion hole, 85a and 86a are emitter terminal insertion holes, 89a is a gate wiring pattern, 89a
b is a collector wiring pattern, 89c is an emitter wiring pattern, and 93a and 93b are insertion holes for gate resistance.

[0010] In FIG. 9, the voltage V _CE emitter-collector voltage of the IGBT, the voltage v ₁₁ is the surge voltage, the portion X is waking current concentration in one of the IGBT, the current I _C is the current flowing the collector of IGBT It is. FIG.
In FIG. 9A, the vertical axis represents voltage, the horizontal axis represents time, the vertical axis in FIG. 9B represents current, and the horizontal axis represents time.

Next, the operation of the high-frequency flashing type dimmable strobe device shown in FIG. 5 will be described. First, the energy storage capacitor 20 is charged to the illustrated polarity by the high-voltage DC power supply 10 that generates a voltage of about 300 V, and the trigger capacitor 62 is charged to the illustrated polarity through the resistor 606. At this time, the voltage of the energy storage capacitor 20 and the trigger capacitor 62 is about 300 V, which is the same as the voltage of the high-voltage DC power supply 10.

Next, from the flash start signal source 610 to FIG.
When a voltage pulse as shown in (A) is output and the trigger thyristor 601 triggers and turns on rapidly, the trigger thyristor 6 is output from the trigger capacitor 62.
01, a current flows through the primary winding of the trigger transformer 61, thereby causing a voltage pulse V ₁₂ as shown in FIG.
Is output to the secondary side of the trigger transformer 61.

[0013] Next, the voltage pulse V ₁₂ is applied between the trigger electrode 10c and the cathode 10b of the flash discharge tube 40, the filler gas in the flash discharge tube 40 is ionized, in FIG. 7 (E) After the indicated delay time td ₃ , the flash discharge tube 40 becomes conductive, and the energy storage capacitor 20, the discharge current limiting circuit 30, the flash discharge tube 40, and the diode 7
0, the discharge of the charge stored in the energy storage capacitor is started in a closed circuit formed by the IGBTs 81 and 82. At this time, the voltage V ₂ shown in FIG.
And the gate is connected to the IG in a high voltage state.
The BTs 81 and 82 are on.

In addition, the flash start signal V _11b applies an on / off signal to the gates of the IGBTs 81 and 82 after the delay time td ₄ shown in FIG. Can be turned on and off.

Next, when the flash light amount emitted from the flash discharge tube 40 reaches a predetermined value, a flash stop signal is given from the flash light amount setting circuit 110 to the high frequency signal source 200, and the IGBTs 81, 82 An ON signal is always supplied to the gate. This is the trigger thyristor 6
This is because it is possible to discharge the charge of the energy storage capacitor 20 by sending a signal only to the gate 01. As described above, the IGBTs 81, 8
2 keeps the on state after the on / off stop, as shown in FIG.
The remaining charge of 0 is discharged.

As shown in FIG. 7C, when the discharge current is interrupted, the inductance of the wiring and the IGBT 8
Such unbalanced when paralleling 1,82 can be observed that surge voltage v ₁₁ that caused.

At this time, the IGBTs 81 and 82 are
To be implemented by arranging two IGBT81,82 the same orientation as in (A), becomes two long collector and emitter wiring IGBT81,82, surge voltage v ₁₁ due to an increase in the inductance is generated factors Becomes

Next, as shown in FIG. 5, a voltage is supplied from one resistor 93 to the gates of the IGBTs 81 and 82 of the conventional high-frequency flashing type dimming strobe device. The value of the gate wiring impedance varies between the IGBTs 81 and 82 due to the difference in the length and width of the wiring until the IGBTs 81 and 82. Voltage change shown in X of Fig. 9 is for either one of the two IGBT81,82 <br/> makes a transition to the fast off state, this is due variations in the. In the situation where the voltage change indicated by X occurs, current concentration occurs in one of the IGBTs, which causes an increase in loss.

[0019]

The conventional high-frequency flashing type dimmable strobe device is constructed as described above, and controls on / off of the discharge current of the thyristor 601 and the energy storage capacitor 20 for triggering the flash discharge tube. Since the IGBTs 81 and 82 of the self-extinguishing type are used respectively, the circuit is complicated and is not suitable for miniaturization of the device. Further, since it is necessary to control a large current capacity, two IGBTs 81 and 82 are connected in parallel and mounted side by side in the same direction.
When the respective collectors and emitters of the IGBTs 81 and 82 are connected, the wiring length becomes longer, and the IGBTs 81 and 82 become longer.
However, there is a problem that a surge voltage is likely to be generated when the current flowing through the power supply is interrupted, and it is not possible to operate at a higher speed.

In addition, since current concentration occurs due to variations in the impedance of the gate wiring, there has been another problem that operation at higher frequencies is not possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to perform a high-frequency control of a trigger of a flash discharge tube and a discharge current of an energy storage capacitor.
Performing only T reduces the size of the device,
Depending on the mounting state of the two IGBTs, the surge voltage is suppressed by suppressing the inductance of the wiring connected to the emitter, the variation in the impedance of the two IGBT gate wirings is reduced, large currents are cut off at high speed, and high frequency It is an object of the present invention to provide a high-frequency flashing type dimmable strobe device which can be operated with a high-performance, small-sized and inexpensive manufacturing.

[0022]

According to a first aspect of the present invention, there is provided a high-frequency flashing type dimming strobe device, comprising: a charge stored in an energy storage capacitor from a high-voltage DC power supply through a discharge current limiting circuit; A high-frequency flashing type dimming strobe device that emits flash light by giving it to a flash discharge tube having a diode having an anode connected to the cathode of the flash discharge tube, and one electrode connected to the cathode of the diode, A first IGBT having the other electrode connected to the cathode of the energy storage capacitor, a second IGBT connected in parallel with the first IGBT,
A flash start signal source for outputting a signal indicating the timing of starting flash emission of the flash discharge tube, and a high-frequency voltage applied to the control electrodes of the first and second IGBTs in response to a signal from the flash start signal source. A high-frequency signal source for supplying the high-frequency signal source, and means for detecting the amount of radiant flash of the flash discharge tube, and controlling the high-frequency signal source when the amount of radiative flash reaches a predetermined value. And the first and second
A flash light quantity setting circuit for stopping the supply of voltage to the control electrode of the IGBT, a first terminal of a primary winding connected to the cathode of the flash discharge tube, and a secondary winding connected to the trigger electrode of the flash discharge tube One end of the wire is connected to a trigger transformer in which the other terminal of the secondary winding is connected to the cathode or anode of the flash discharge tube, and one end is connected to the other terminal of the primary winding of the trigger transformer. And a trigger capacitor having the other end connected to the cathode of the energy storage capacitor, and voltage drop means having one end connected to the anode of the flash discharge tube and the other end connected to the cathode. It is configured.

A high frequency flashing type dimming strobe device according to a second aspect of the present invention has a flash discharge tube, and controls the discharge current of the flash discharge tube at a high frequency so that the flash discharge tube flashes at a high frequency. A flashing type dimmable strobe device, which is connected in series to the flash discharge tube, a first IGBT that controls a discharge current of the flash discharge tube at a high frequency, and is connected in parallel with the first IGBT; A second IGBT controlled by a discharge current of the flash discharge tube and a high frequency;
And a second IGBT includes a gate terminal, a collector terminal, an emitter terminal of the first IGBT, and a second IGBT.
The terminals are arranged in the order of the emitter terminal, the collector terminal, and the gate terminal, and the emitter terminals are mounted close to each other.

A high frequency flashing type dimming strobe device according to a third aspect of the present invention has a flash discharge tube, and controls the discharge current of the flash discharge tube at a high frequency so that the flash discharge tube flashes at a high frequency. A flashing type dimmable strobe device, which is connected in series to the flash discharge tube, a first IGBT that controls a discharge current of the flash discharge tube at a high frequency, and is connected in parallel with the first IGBT; A second IGBT for controlling the discharge current of the flash discharge tube and a high frequency, and the first and second IGBTs;
A high-frequency signal source having an output terminal for outputting a high-frequency signal to the gate of the IGBT; first resistance means inserted in series between the gate of the first IGBT and the output terminal of the high-frequency signal source; , A second resistance means inserted in series between the gate of the second IGBT and the output terminal of the high-frequency signal source.

[0025]

The first and second IGBTs for controlling the current according to the first invention are normally kept off. When the high-frequency signal source receives a signal from the flash start signal source, the first
A high-frequency signal is supplied from a high-frequency signal source to the gate of the second IGBT and the first and second IGBTs are turned on. When the first and second IGBTs are turned on, the charge accumulated in the trigger capacitor flows through the primary winding, the diode, and the first and second IGBTs of the trigger transformer. A high voltage is output to the secondary winding of the utility transformer to trigger the flash discharge tube. When the flash tube is triggered, the gas in the flash tube is ionized and becomes conductive, and the discharge current of the energy storage capacitor begins to flow. Thereafter, by turning on and off the gate voltages of the first and second IGBTs at a high frequency, the flash discharge tube can be turned on and off at a high frequency.

Next, a point in time at which the amount of flash light radiated from the flash tube reaches a predetermined value is detected by means for detecting the amount of flash light, and at this time, the high-frequency signal supplied to the gates of the first and second IGBTs is turned off. To And the first and second
The on / off operation of the IGBT is stopped, and there is no closed circuit through which the charge of the energy storage capacitor flows, so that the charge remaining in the trigger capacitor is not discharged, and an appropriate amount of light can be obtained.

First and second IGBs in the second invention
In T, the emitter wiring is shortened by arranging the gate terminal, the collector terminal, the emitter terminal of the first IGBT, the emitter terminal, the collector terminal, and the gate terminal of the second IGBT in order and bringing the emitter terminals close to each other. be able to. Further, by shortening the wiring length, the impedance and inductance of the wiring can be reduced.

The first and second IGBs in the third invention
T indicates the impedance between the first and second IGBTs and the output terminal of the high-frequency signal source, for example, the resistance value of the first and second resistance means, by the first and second resistance means connected to the gate. Make the output terminal of the high-frequency signal source
By setting the impedance to be sufficiently larger than the impedance between the gate of the second IGBT and the second IGBT, the impedance can be set to substantially the same value, and the resistance value can be made sufficiently larger than the inductance of the wiring connected to the gate. As a result, the influence of inductance can be reduced.
Of the turn-off time of the IGBT can be reduced to prevent current concentration occurring in one of the first and second IGBTs.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high-frequency flashing type dimmable strobe device according to the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes a high-voltage DC power supply, reference numeral 20 denotes an energy storage capacitor connected between the positive electrode and the negative electrode of the high-voltage DC power supply 10 for storing energy for generating a flash of a flash discharge tube, and 3.
0 is a discharge current limiting circuit, 31 is a choke coil, and 32 is a diode. The discharge current limiting circuit 30 includes a choke coil 31 and a diode 32. 4
0 is a flash discharge tube; 40a is an anode of the flash discharge tube 40;
b is a cathode of the flash discharge tube 40, and 40c is a trigger electrode of the flash discharge tube 40. The anode 40a of the flash discharge tube 40 is connected to the energy storage capacitor 20 via the discharge current limiting circuit 30. 50 is a flash discharge tube 40 at one end.
, A resistor connected at the other end to the cathode 40b of the flash discharge tube 40, 60 is a trigger circuit of the flash discharge tube 40, 61 is a flash discharge at one end of the primary winding and the secondary winding. A trigger transformer for triggering the flash discharge tube 40, which is connected to the cathode 40b of the tube 40 and the other end of the secondary winding is connected to the trigger electrode 40c, and 62 is one of the trigger transformers 61
A trigger capacitor connected to the other end of the next winding and storing energy for triggering the flash discharge tube 40. The trigger circuit 60 includes a trigger transformer 61 and a trigger capacitor 62. 70 is a diode in which the anode is connected to the cathode 30b of the flash discharge tube 40, and 81 and 82 are I in which the collector is connected to the cathode of the diode 70.
GBTs 91 and 92 are resistors having one ends connected to the gates of the IGBTs 81 and 82, 100 is a high-frequency signal source that applies a high-frequency voltage to the gates of the IGBTs 81 and 82 via the resistors 91 and 92, and 110 is a high-frequency signal source 100. , A flash start signal source 120 for outputting a signal for starting a flash to the high frequency signal source 100, and a flash light measuring circuit 130 for measuring the flash light of the flash discharge tube 40 and setting the flash light amount to a flash light setting circuit. A light receiving element for notifying 110.

Here, both ends of the secondary winding of the trigger transformer 61 are connected to the cathode 40b and the trigger electrode 40c of the flash discharge tube 40, but both ends of the secondary winding are connected to the flash discharge tube 40.
May be connected to the anode 40a and the trigger electrode 40c.

FIG. 2A is a diagram showing a waveform of the flash start signal V ₁ output from the flash start signal source 120. FIG. 2B shows an IGBT output from the high-frequency signal source 100.
FIG. 5 is a diagram illustrating a waveform of a voltage V ₂ of a control signal. FIG. 2 (C)
Is the collector-emitter voltage V of the IGBTs 81 and 82
It is a figure showing a waveform of _CE . FIG. 2D shows the flash discharge tube 4.
Is a diagram showing a waveform of a negative trigger voltage between electrodes V ₃ 0. FIG. 2E is a diagram showing a current waveform of the discharge current Id of the flash discharge tube 40. Further, in FIG.
(D) is a diagram showing a voltage waveform, in which the vertical axis represents voltage and the horizontal axis represents time. (E) is a diagram showing a current waveform, in which the vertical axis represents current and the horizontal axis represents time.

In FIG. 3A, reference numerals 81 and 82 denote T.
IGBT with an outer shape similar to O-220F, 83 is IGBT8
1 is a gate terminal, 84 is a collector terminal of the IGBT 81,
85 is an emitter terminal of the IGBT 81, 86 is an IGBT 8
An emitter terminal 2 and a gate terminal 87 of the IGBT 82 are shown. In FIGS. 3B and 3C, 83 and 8
8a is a gate terminal insertion hole, 84a and 87a are collector terminal insertion holes, 85a and 86a are emitter terminal insertion holes, 89a is a gate wiring pattern, 89b is a collector wiring pattern, 89c is an emitter wiring, 91a and 92.
a is an insertion hole for a gate resistor. Here, FIGS. 3B and 3C show the wiring patterns on the front and back of one substrate, respectively.

FIGS. 4A and 4B are enlarged waveforms at the time of turning off the IGBT when the IGBT is turned off using the board on which the mounting of FIG. 3 is performed. The vertical axis of FIG. The voltage and the horizontal axis indicate time, respectively, and FIG.
FIG. 7 is a diagram showing a waveform of a collector-emitter voltage V _CE of the GBTs 81 and 82. 4 (B) is a diagram showing a waveform of the collector current I _C of IGBT81,82.

Next, the operation will be described. First, 300V
The energy storage capacitor 20 is charged to the illustrated polarity and the trigger capacitor 62 is charged to the illustrated polarity by the high-voltage DC power supply 10 that generates a voltage of the order of magnitude.
At this time, the voltage of the energy storage capacitor 20 and the voltage of the trigger capacitor 62 are about 300 V, which is the same voltage as that of the high-voltage DC power supply 20.

Next, when a flash start signal is output from the flash start signal source 120 to the high-frequency signal source 100, or when the high-frequency signal source 100 detects an overvoltage of the energy storage capacitor 20, as shown in FIG. Nah, IGB
Signal V ₁ which controls the T is output. The IGBT control signal V _1, a voltage is supplied to the gate of the IGBT 81 and 82, IGBT81,82 becomes turned on, the trigger capacitor 62, the primary winding side of the trigger transformer 61, diode 70, IGBT 81 and 82 The discharge current of the trigger capacitor 62 flows through the closed circuit.
Due to this discharge current, the secondary side of the trigger converter 61
The voltage V ₃ as shown in FIG. 2 (D), is outputted to between the gate electrode 40c and the cathode 40b of the flash discharge tube 40, because the flash discharge tube 40 is triggered, sealed in the flash discharge tube gas Are ionized to conduct. At this time, the diode 70 connected to the flash discharge tube 40 in series with the IG
Since the BT 81 and the IGBT 82 are in the ON state, when the flash discharge tube 40 is turned on, the electric charge stored in the energy storage capacitor 20 is discharged.
0, a flash discharge tube 40, a diode 7, and a discharge to a closed circuit composed of IGBTs 81 and 82.
Flash light is emitted from 0. After this, the high-frequency signal source 100
By turning on and off the gate voltages supplied to the IGBTs 81 and 82 from the, the discharge current Id flowing through the flash discharge tube 40 can be turned on and off as shown in FIG.

Next, when the flash light amount reaches a predetermined value, and when a flash stop signal is output from the flash light amount setting circuit 110, no voltage is supplied from the high-frequency signal source 100 to the gates of the IGBTs 81 and 82. 82
Transitions to the off state and continues to maintain that state. For this reason, even if the ions in the flash discharge tube 40 are not extinguished, the discharge current Id can be continuously cut off, and the residual charge of the energy storage capacitor 20 does not flow after the end of the high-frequency blinking.

Accordingly, the discharge current Id can be turned on / off by turning on / off the gate signals of the IGBTs 81 and 82, and the discharge current Id does not flow after the high-frequency blinking ends, so that the circuit can be simplified and the power consumption can be reduced. There is an advantage that power can be achieved.

When the strobe device is turned on and off at a high frequency, the loss generated in the IGBTs 81 and 82 increases. This is because the switching loss increases as the frequency increases. As a general measure for preventing the loss from increasing, there is a method of shortening the switching time. That is, it is conceivable to lower the gate resistance value so that the rise and fall times of the current flowing through the IGBTs 81 and 82 are shortened. The high-frequency flashing type dimming strobe device uses two IGBTs with a three-terminal outline called the TO-220 outline or TO-3P outline connected in parallel in order to cut off a large current at high speed and operate at high frequency. Is done. At this time, when a large current is cut off at a high speed as described above, the rate of change of the current at this time with respect to time is determined by the surge voltage generated by the wiring inductance in the closed circuit.
2, the voltage may exceed the breakdown voltage.

The wiring impedance of the gate is 2
If the IGBTs 81 and 82 are not equal,
Or loss resulting current imbalance due to the impedance of the bets wiring differences increase, sometimes destroying going current concentration in one of the IGBT.

As described above, as shown in FIGS. 3A to 3C, the two IGBTs 81 and 82 are connected in parallel in the horizontal direction and in the opposite directions. FIG. 3A shows that T
IGBTs 81 and 82 having an outer shape similar to that of O-220F are connected to a gate terminal 83, a collector terminal 84, and an emitter terminal 8 from the left.
5, gate terminal 86, collector terminal 87, gate terminal 8
8 and mounted on a board. Also, like the wiring patterns shown in FIGS. 3B and 3C,
The emitter terminal insertion holes 85a and 85b are close to each other,
The wiring length for connecting the respective emitter terminals 85 and 86 can be shortened. By mounting in this manner, the length of the wiring connected to the emitter terminal can be reduced, the inductance of the wiring can be reduced, and the surge voltage can be suppressed. In this embodiment, the parallel connection is performed so as to be horizontal and opposite to each other. However, it is sufficient that the emitter terminals 85 and 86 are close to each other.
The BTs 81 and 82 may be mounted so as to be L-shaped,
The same effects as in the above embodiment can be obtained.

The resistors 91 and 92 are connected to the respective IGs.
In addition to connecting to the gates of BT81 and 82 separately,
With select a resistance value much wiring impedance is negligible, since the impedance of the gate is balanced, and reduce variations in the switching time, IGB
It is possible to balance the current flowing through T81 and T82.

Accordingly, there is an advantage that a large current can be turned on / off at a high speed, and it can be operated at a high frequency.

[0043]

As described above, according to the high frequency flashing type dimming strobe device of the first aspect of the present invention, a diode having an anode connected to the cathode of a flash discharge tube and one electrode connected to the cathode of the diode. A first IGBT having the other electrode connected to the cathode of the energy storage capacitor, a second IGBT connected in parallel with the first IGBT, and a signal indicating a timing of starting emission of flash light from the flash discharge tube. , A high-frequency signal source that receives a signal from the flash start signal source and supplies a high-frequency voltage to the control electrodes of the first and second IGBTs, and a primary source connected to the cathode of the flash discharge tube. A trigger transformer in which one terminal of the winding is connected, one terminal of the secondary winding is connected to the trigger electrode of the flash tube, and the other terminal of the secondary winding is connected to the cathode or anode of the flash tube. , Trigger One end is connected to the other terminal of the primary winding of the transformer, and one end is connected to the trigger capacitor having the other end connected to the cathode of the energy storage capacitor and the anode of the flash discharge tube. And a voltage drop means connected to the other end. The first and the second control the trigger of the flash discharge tube and the control of the flash light amount of the flash discharge tube.
Can be performed only by turning on / off the IGBT, which has the effect of simplifying the circuit and reducing the size of the device. In addition, normally, by keeping the first and second IGBTs in the off state, after the high-frequency blinking ends, Since there is no extra discharge from the energy storage capacitor, there is an effect that power saving can be achieved.

According to the second aspect of the present invention, the first IGBT is connected in series with the flash discharge tube to control the discharge current of the flash discharge tube at a high frequency.
And a second IGBT connected in parallel with the first IGBT and controlling the discharge current of the flash discharge tube and a high frequency, wherein the first and second IGBTs are a gate terminal and a collector terminal of the first IGBT. , The emitter terminal, the emitter terminal of the second IGBT, the collector terminal, and the gate terminal are arranged in this order, and the emitter terminals are mounted close to each other.
By shortening the length of the wiring connected to the emitter terminal and reducing the impedance and inductance of the wiring, it is possible to cut off large currents at high speed and to perform blinking at high frequency, resulting in higher functionality. There is.

According to the third aspect of the present invention, the first IGBT is connected in series to the flash discharge tube and controls the discharge current of the flash discharge tube at a high frequency.
A second IGBT connected in parallel with the first IGBT and controlling the discharge current of the flash discharge tube and the high frequency, and a high-frequency signal source having an output terminal for outputting a high-frequency signal to the gates of the first and second IGBTs A first resistance means inserted in series between a gate of a first IGBT and the output terminal of the high-frequency signal source; and a second resistor connected between the gate of the second IGBT and the output terminal of the high-frequency signal source. And the second resistance means inserted in series between the first and second resistance means.
Current flowing through the first and second IGBTs can be balanced by the resistance means of the first or second IGBT.
The current concentration occurring in one of the two types can be prevented, and the quality of the high-frequency flashing type dimmable strobe device can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a high-frequency flashing type dimmable strobe device according to an embodiment of the present invention.

FIG. 2 is a waveform diagram of a main part of a circuit of a high-frequency flashing type dimmable strobe device according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a mounted state of an IGBT of a high-frequency flashing type dimmable strobe device according to an embodiment of the present invention,
It is a top view of the front side and the back side of the wiring pattern of IGBT.

FIG. 4 is a diagram showing waveforms of a voltage and a current between a collector and an emitter when the IGBT according to the embodiment of the present invention is turned off.

FIG. 5 is a circuit diagram of a conventional high frequency flashing type dimmable strobe device.

6 is an IG constituting the high-frequency signal source shown in FIG.
FIG. 3 is a circuit diagram illustrating a part of a BT drive circuit.

FIG. 7 is a waveform diagram of a main part of a circuit of a conventional high-frequency blinking type dimmable strobe device.

FIG. 8 is a perspective view showing a mounted state of an IGBT of a main part of a circuit of a conventional high-frequency flashing type dimming strobe device, and a plan view of a front side and a back side of an IGBT wiring pattern.

FIG. 9 is a diagram showing waveforms of a voltage and a current between a collector and an emitter when an IGBT is turned off in a conventional high-frequency flashing type dimming strobe device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 High-voltage DC power supply 20 Energy storage capacitor 30 Discharge current limiting circuit 40 Flash discharge tube 50 Resistor 60 Flash discharge tube trigger circuit 61 Trigger transformer 62 Trigger capacitor 70 Diode 81,82 IGBT 85 Emitter terminal 85a Emitter terminal Insertion hole 86 Emitter terminal 86a Emitter terminal 89c Emitter wiring pattern 91, 92 Resistor 100 High frequency signal source 110 Flash light setting circuit 120 Flash start signal source 130 Light receiving element

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05B 41/32 G03B 15/05

Claims (3)

(57) [Claims] 1. A high-frequency flashing type dimming strobe which emits a flash by applying a charge stored in an energy storage capacitor from a high-voltage DC power supply to a flash discharge tube having an anode, a cathode, and a trigger electrode through a discharge current limiting circuit. An apparatus, comprising: a diode having an anode connected to the cathode of the flash discharge tube; a first IGBT having one electrode connected to the cathode of the diode and the other electrode connected to the cathode of the energy storage capacitor; Second IGBT connected in parallel with the first IGBT
A flash start signal source for outputting a signal for instructing a timing at which the flash discharge tube starts emitting a flash, and receiving a signal from the flash start signal source to apply a high frequency to control electrodes of the first and second IGBTs. A high-frequency signal source for supplying a voltage with the high-frequency signal source, comprising means for detecting the amount of radiant flash of the flash discharge tube, and the high-frequency signal source when the amount of radiant flash reaches a predetermined value. A flash light amount setting circuit for controlling and stopping supply of voltage to control electrodes of the first and second IGBTs; and connecting one terminal of a primary winding to the cathode of the flash discharge tube; A trigger transformer in which one terminal of a secondary winding is connected to the trigger electrode of the discharge tube, and the other terminal of the secondary winding is connected to a cathode or anode of the flash discharge tube; Connect one end to the other terminal of the next winding A high-frequency capacitor comprising: a trigger capacitor having the other end connected to the cathode of the energy storage capacitor; and a voltage drop means having one end connected to the anode of the flash discharge tube and the other end connected to the cathode. Flashing type dimmable strobe device. 2. A high-frequency flashing type dimming strobe device having a flash discharge tube, wherein the flash discharge tube flashes at a high frequency by controlling a discharge current of the flash discharge tube at a high frequency. A first IGBT connected in series with the tube and controlling the discharge current of the flash discharge tube at a high frequency; and a second IGBT connected in parallel with the first IGBT and controlling the discharge current of the flash discharge tube at a high frequency. And wherein the first and second IGBTs have a gate terminal, a collector terminal, an emitter terminal of the first IGBT, an emitter terminal, a collector terminal, and a gate terminal of the second IGBT in this order. A high-frequency flashing type dimmable strobe device characterized in that emitter terminals are arranged side by side and mounted close to each other. 3. A high-frequency flashing type dimming strobe device having a flash discharge tube, wherein the flash discharge tube flashes at a high frequency by controlling a discharge current of the flash discharge tube at a high frequency. A first IGBT connected in series with the tube and controlling the discharge current of the flash discharge tube at a high frequency; and a second IGBT connected in parallel with the first IGBT and controlling the discharge current of the flash discharge tube at a high frequency. An IGBT, a high-frequency signal source having an output terminal for outputting a high-frequency signal to the gates of the first and second IGBTs, and a series connection between the gate of the first IGBT and the output terminal of the high-frequency signal source A first resistance means inserted in series, a second resistance means inserted in series between the gate of the second IGBT and the output terminal of the high-frequency signal source,
High-frequency flashing type dimmable strobe device equipped with