SU1283701A1 - Electronic flash bulb - Google Patents

Abstract

The invention relates to photographic equipment and allows to increase the efficiency. The voltage conversion unit 1 after a full charge of the capacitor 8 is in the off state and does not consume battery power 5. The voltage conversion unit 1 is switched on periodically with a predetermined frequency only to compensate for the capacitor self-discharge 8. The frequency of switching on the I conversion unit is set by the capacitor 11 and the resistor 14. Thus, the accuracy and constancy of the charge level of the accumulative charge of the capacitor 8 and, consequently, the leading number of photomultipliers is increased. 2 Il.

Description

 one

The invention relates to photographic equipment, in particular to pulsed lighting devices intended for photography.

The aim of the invention is to increase efficiency and accuracy in operation.

Figure 1 is a schematic diagram of the proposed device; figure 2 - timing charts of the device

The electronic photograph contains a voltage conversion unit 1, a lighting unit 2, and an automation device.

The voltage conversion unit I consists of a transformer 3, a transistor 4, a power source 5, a switch 6.

The illumination unit 2 is provided with an outgoing diode 7, a storage capacitor 8, and a lamp ignition capacitor 9.

The automation device contains a capacitor 11, a variable resistor 12, a Zener diode 13 and an additional variable resistor 14.

The plus bus power supply 5 is connected to the first output of the additional variable resistor 14 and the end of the power winding of the transformer 3.

Minus power supply bus 5 is connected to the first output of the resistor and collector of the transistor 4 of direct conductivity.

The initial terminal of the power winding of the transformer is connected to the emitter of the transistor 4 of direct conductivity, the base of which is connected to the positive terminal of the zener diode 13 and the beginning of the feedback coupling of the transformer 3.

The end of the feedback winding of the transformer 3 is connected to the sec. the terminals of the resistor and the additional variable resistor 14.

The negative terminal of the Zener diode 13 is connected to the emitter of the direct conduction transistor 4 through a series-connected variable resistor 2 and a capacitor 11. A high terminal to the winding of the transformer 3 is connected to the positive terminal of diode 7, the negative terminal of which is connected to the positive terminal of the storage capacitor 8.

ten

J5

20

25

thirty

35

The end of the high-voltage winding of the transformer 3 is connected to the negative terminal of the storage capacitor 8.

Photospotka works in a glorious way.

When the switch 6 is turned on, the voltage from the power source 5 is supplied to the transformer 3 and the transistor 4 of the voltage conversion unit 1, which through the diode 7 charges the main storage capacitor 8 and the lamp ignition capacitor 9. After the capacitor 8 is charged to the voltage In order to obtain the required energy of the plug, the Zener diode 13 breaks down and the positive voltage from the capacitor 11 goes to the base of the transistor 4, as a result of which the transistor 4 closes. Next, the capacitor 11 is discharged along the circuit: capacitor 11, variable resistor 12, Zener diode 13, basic winding of transformer 3, resistor 14, emitter winding of transformer 3. The voltage on capacitor II decreases, the reverse current through Zener diode 13 decreases sharply, the zener diode closes, the transistor 4 is opened and the voltage conversion unit 1 through the diode 7 charges the capacitor 8. Then the Zener diode 13 is broken and the transistor 4 is closed. Further, the scheme works as indicated above.

0

five

0

five

From t to t

k + 1

(Fig. 2, curves 1 and 2) the charging of the storage capacitor 8 occurs up to the voltage U ,,.,. Voltage between

OS p.

points A and C (U ,,) after the operation of automation is zero (time from t j to t). At this time, the capacitor 8 is self-discharging by a small value of D i к k m-MeHt of time t, the voltage conversion unit 1 is automatically switched on and the capacitor 8 is recharged (the time from

 BEFORE

k. + a

Thus, the conversion unit G, after the complete charging of the capacitor 8, is in the off state and does not consume the energy of the batteries 5. The voltage conversion unit 1 switches on periodically with a predetermined frequency only to compensate the capacitor 8 self-discharge. mustache

Claims (1)

It is compressed using a capacitor 1I and a resistor 14. Thus, the accuracy and constancy of the charge level of the storage charge of the capacitor 8 and, consequently, the leading number of photolumines, is increased. The formula was invented by an electronic photo flash containing a power source, a variable resistor, a diode, a direct conduction transistor, a transformer, and a storage capacitor, characterized in that, in order to increase efficiency and accuracy, an additional variable capacitor was introduced into it. a resistor and a zener diode, with the plus power supply bus connected to the first output of the additional variable resistor and the end of the power winding of the transformer, the negative power supply bus connecting ene to a first terminal of resistor go 20 837014 and the collector of the forward transistor, the initial output of the power winding of the transformer is connected to the emitter of the direct conduction transistor, the base of the direct conduction transistor is connected to the positive terminal of the zener diode and the beginning of the feedback winding of the transformer, the end of which is connected to the second terminals of the resistor and an additional variable resistor, the negative terminal of the Zener diode is connected to the emitter of the forward transistor through a series-connected variable resistor and a capacitor, high The voltage winding of the transformer is connected to the positive terminal of the diode, the negative terminal of which is connected to the positive terminal of the storage capacitor, the end of the high-voltage winding of the transformer is connected to the negative terminal of the storage capacitor. 15