SU134341A1 - Device for charging the storage capacitor used to power the flash lamp - Google Patents

Description

The use of a partitioned source for charging the terminating capacitor used to power the flash lamp is known.

In order to reduce the power consumption of this source, it is proposed to attach its sections to a capacitor in parallel through elements with unipolar conductivity, for example semiconductor diodes, and corresponding active resistances.

Each charging circuit in series with an element with unipolar conductivity can include the winding of the corresponding electromagnetic relay, the contacts of which are included in the circuit of the next higher voltage section.

FIG. 1-5 shows various variants of the proposed device.

In the embodiment of FIG. 1 sections of battery B are connected to storage capacitor C in parallel through cells with unipolar conductivity Si, B- ... B "(which can be used, for example, semiconductor diodes) and the corresponding active resistance RI, R-2 ... .

It is known that in such a circuit, under the condition ... Rn and the same voltage of all sections, k.p.d.t. JTI where n is the number of sections of battery B from which capacitor C is charged. With an increase in the number of sections n of k. d. rises. This is due to the fact that at the beginning of the charge of the capacitor, the charging current flows mainly through part of the battery connected to the capacitor with relatively small resistances. Since the total voltage of these sections is only a fraction of the total voltage of the battery, a smaller flow is required to accumulate charge.

No. 134341 - 2 -

power source energy. As the charge on the capacitor accumulates, the voltage on which gradually increases and when it becomes equal to the voltage of the first section of the battery, the current through the branch consisting of the resistance Ri and cell 5i stops and the charge of the capacitor continues mainly through the branch R - B. Such a sequential process of redistributing the current of the sections occurs automatically during the entire time that the charge of the capacitor C becomes equal to the full voltage of the battery B.

 Obviously, in the system shown in FIG. 1, different battery sections consume different amounts of energy; the greatest consumption falls on the share of the first section, the total current through which flows during the entire charge cycle, the smallest on the share of the last section. In order to ensure the same service life under these conditions of all sections Bb Bg ... Bp, they should be connected one by one, from the variants shown in FIG. 2 and 3. For each of these options, for a given number of sections, it is possible to calculate how many elements there should be in each section in order to ensure the same service life of all sections. In principle, the operation of the circuits shown in FIG. 2 and 3 is no different from the operation of the circuit in FIG. one.

Practically in the proposed schemes seldom happens more than three sections, which corresponds to the maximum possible efficiency (75%). The limitation of the number of sections is caused primarily by an increase in the charge time of the capacitor through the high-resistance resistances of the last high-voltage sections. In order to reduce the charge time and thereby increase the device efficiency and to expand its field of application, it is proposed to use controlled diodes, such as silicon diodes of the pnp type, as elements with unipolar conductivity.

One of the possible variants of the circuit using controlled diodes is shown in FIG. 4. Before charging, the voltage on all capacitors of the circuit is zero, and the controlled diodes are in a non-conducting state. The storage capacitor C begins to charge from the battery BO section through the resistance R and the uncontrolled diode B. When the voltage on capacitor C becomes equal to the ignition potential of the Yz discharge lamp, the latter ignites, resulting in a charging current pulse I l through the resistance Rl whose amplitude and duration are determined by the parameters of this circuit. At the resistance Rl and inductance LI, a voltage pulse arises between the emitter and the control electrode of the controlled diode VUh. Under the action of this pulse, the VU diode is unlocked and the capacitor C starts to additionally charge from the battery section B. As the voltage on the capacitor C increases, the remaining sections of the battery are connected in the same way.

Obviously, in order for the circuit to work properly, the arresters P, P ... must have successively increasing ignition potentials corresponding to the chosen power source sectioning. For simplicity, the circuit may be of a discharge type interconnected in series. By varying the number of series-connected gaps in individual sections, it is possible to easily make a series connection of power supply sections.

A rectifier control system using arresters is one of the options for using controlled diodes for economically partitioned charging of a storage capacitor. To obtain high efficiency without excessively increasing the charging capacitor charge time, also use the above-described partitioned charging system through conventional uncontrolled diodes, including in series with these diodes, the windings of electromagnetic relays.

FIG. Figure 5 shows a circuit allowing the capacitor to be charged through low impedance resistors. At the beginning of the charging cycle, the charging current of the first section of the power source, flowing through the coil of the relay P, shunted by the capacitor Ci, is large enough to open the contacts of this relay and thereby break the charging current of the remaining sections of the battery. As the voltage on the capacitor C increases, the charging current exponentially hits and, finally, becomes insufficient to hold the PI relay core. Therefore, the contacts of this relay are closed and the charge of the capacitor from the next section B-2 of the battery starts through the winding of the relay Po, which is bridged by capacitor C-2. In the future, the switching process proceeds as described.

Subject invention

Claims (2)

1. A device for charging the storage capacitor used to power the flash lamps from an isolated source, characterized in that, in order to reduce the energy consumption of the specified source, its sections are connected to the capacitor in parallel through elements with unipolar conductivity, such as semiconductor diodes, and corresponding active resistances. 2. A device according to claim 1, characterized in that a winding of a corresponding electromagnetic relay is connected to each charging circuit in series with an element with unipolar conductivity, the contacts of which are included in the circuit of the next higher voltage section. 5p tT 62 eleven -Tbp Ogt T . F-- ". four , With eN It: RZ B, ZIR, B, With IS CTS ±) - TTTV / g 5  + , + r Rj c / DCH-t, -. D 2. five, 60 4