RU2422983C2 - Voltage pulse generator - Google Patents

Abstract

FIELD: radio engineering.

SUBSTANCE: device is assembled as per Arkadyev-Marx scheme and includes storage capacitors, two charging branches from circuit of diodes, dischargers and charging inductance connected between one of poles of voltage supply source and anode.

EFFECT: reduction of power losses in charging circuit.

1 dwg

Description

The invention relates to a pulsed high-voltage technique and can be used in power supplies of various electrophysical devices.

Known high-voltage pulse generators assembled according to the Arkadyev-Marx scheme, which contain several stages with storage capacitors, charging resistors and dischargers in each stage (ed. St. No. 156616, CL H03K 3/53, 1963, RF patent No. 2317637 Cl. H03K 3/53, 2008).

The disadvantages of these generators are the large charge time of the storage capacitors, as well as the large power loss on the active resistance of the charging resistors.

A voltage pulse generator is also known (RF patent No. 2091980, class H03K 3/00, 1997), in which the charging resistors are replaced by charging inductances. In such a scheme, power losses during charging of storage capacitors are reduced. However, the charging time of the storage capacitors remains quite large, since the charging process is carried out sequentially.

Closest to the proposed device in technical essence is a high voltage pulse generator (ed. St. No. 731530, class H02M 7/26, H03K 3/53, 1980), which is assembled according to the Arkadyev-Marx scheme. It contains storage capacitors, dischargers, a load, two charging branches, one of which is made in the form of a chain of diodes connected in series, and a supply voltage source. The generator operates as follows. From the source of the charging voltage of negative polarity (for the direction of inclusion of the diodes), the capacitors charge. In this case, the polarity of the voltage across the capacitors is such that when the arrester is switched on, the diodes are closed by reverse voltage and the series-connected capacitors are charged to the load, forming a high voltage pulse on it.

The disadvantage of this generator is the large charging time of the storage capacitors, since they are charged sequentially one after another, and large power losses on the active resistance of one branch of charging resistors.

The technical task of this invention is to reduce power losses in the charging circuit, reducing the charging time due to the fact that the charging process is carried out in parallel, and obtaining double the voltage across the storage capacitors.

The specified technical result is achieved in that, like the prototype, which is also assembled according to the Arkadyev-Marx scheme, the voltage pulse generator contains storage capacitors, dischargers, two charging branches, one of which is made in the form of a chain of diodes connected in series and a supply voltage source.

New in the inventive generator is that the generator is additionally equipped with a charging inductance. The second charging circuit is made similar to the first, in the form of a chain of diodes connected in series, while the charging inductance is connected between one of the poles of the supply voltage source and the anode of the last diode from the second branch.

The drawing shows an electrical diagram of the proposed generator.

The generator contains several stages 1 ... n. Each of the stages contains storage capacitors 2, dischargers 3 and 4, charging diodes 5 and 6, as well as a common charging inductance 7 for all stages.

The pulse voltage generator operates as follows.

The storage capacitors 2 are charged through the charging inductance 7, the charging diodes 5 and 6 from the supply voltage U _input . Since during the charge all the diodes 5 and 6 are open, the storage capacitors are connected in parallel, and the process of charging the capacitors occurs simultaneously. The charge time of the capacitors is determined by the formula

t = π√LCn,

where L is the charging inductance 7;

C - Capacity of charging capacitors 2;

n is the number of cascades 1;

π - 3.14.

Such a circuit allows charging storage capacitors in a minimum time with minimal power loss. Provided that the active resistance of the charge circuit is close to zero, the charge process is resonant in nature, and the storage capacitors 2 are charged to a double supply voltage, which is not achieved in any of the known Arkadyev-Marx circuits. After the charge of the storage capacitors 2, the charging diodes 5 and 6 are locked and hold the voltage at the storage capacitors at a level of 2U _in . After the breakdown of the controlled spark gap 3 using the generator of igniting pulses U _gip, the remaining spark gap 4 are activated, the storage capacitors are connected in series and at the output of the circuit to the load R _n . we have stress

U _{o out} = 2U in _x n.

In this case, the charging diodes 5 and 6 remain closed, without affecting the output voltage. After the discharge of the storage capacitors to the load R _n , the diodes 5 and 6 open and periodically the process is completely repeated.

Claims (1)

The voltage pulse generator, assembled according to the Arkadyev-Marx scheme, containing storage capacitors, dischargers, two charging branches, one of which is made in the form of a chain of diodes connected in series, and a supply voltage source, characterized in that the generator is additionally equipped with a charging inductance, the second charging the branch is made in the form of a chain of series-connected diodes, while the charging inductance is connected between one of the poles of the supply voltage source and the anode of the last diode and from the second charging branch.