SU453787A1 - DEVICE OF AMPLITUDE CONTROL OF THE EXCITATION GENERATOR OF EMISSION SPECTRA - Google Patents

Description

one:

The invention relates to the field of pulsed technology, and is intended, for example, for electronically controlled stabilization of the charging voltage of a capacitive storage of a discharge circuit of an excitation generator of emission spectra.

According to the main author. St. No. 347874, devices for amplitude control of an excitation generator of emission spectra are known.

However, in the known devices, due to the presence of the inductances of the scattering of the windings of the power transformer, energy is accumulated in the charging circuit, which at the moment of switching the regulating thyristor is transferred to a capacitive storage device, recharge it. In order to achieve a high accuracy of stabilization, such a charge is not permissible because the energy accumulated in this case additionally in a capacitive storage device depends on the charging current at the time of switching the regulating thyristor. The magnitude and constancy of this current is determined by the value and stability of the supply voltage.

In order to improve the accuracy of controlling the amplitude of the charge voltage of the storage capacitor, the proposed device further comprises a second diode connected in series to the charging circuit according to the first diode, and a chain of series-connected third diode and

a second storage capacitor, shunted by a resistor, connected between the common point of the parts of the secondary transformer secondary winding and the common point of the first and second diodes, the third and first diodes are connected to one another by one nominal electrodes, and the control thyristor control unit consisting of a threshold device loaded by the driver including pulses connected to the input terminals to the first storage capacitor through the first and second diodes.

The drawing shows the proposed device.

The device contains a transformer 1 with a primary winding 2, charge and additional secondary parts, respectively.

3 and 3, regulating thyristor 4, control thyristor control unit 5 4, consisting of a threshold device 6, loaded by a driver 7 including pulses, charging resistor 8, first diode 9, first storage capacitor 10, block 11 of capacitor discharge 10 and ignition , the second diode 12, a chain of series-connected third diode 13 and the second storage capacitor 14, jiggled with a resistor 15.

The thyristor 4 is connected to a circuit consisting of a charging resistor 8 and a part of the winding 3, the other part of which is connected to the capacitor 10 through a chain of series and according to the included diodes 12 and 9. A chain of series-connected diode 13 and conditor 14 is connected between a common point parts of the secondary winding 3 of the transformer 1 and the common point of the diodes 9 and 12. Diodes 13 and 9 are connected to each other by the same electrodynamic, and block 5 - the input terminals to the capacitor 10 through diodes 12 and 9.

The device works as follows.

In the corresponding i-period of the alternating supply voltage applied to the winding 2 of transformer 1, the capacitor 10 is charged through diodes 12, 9 and the resistor 8 from the full secondary winding 3 of transformer 1, and the co-capacitor 14 from a part of this winding through diodes 12 and 13.

The charge continues until the time when the voltage on the capacitor 10 reaches a predetermined level, after which the signal from the output of the threshold device 6 starts the driver 7, which turns on the regulating thyristor 4, while the centric of the resistor 8 and part of the winding 3 is short-circuited, the total charge the voltage is reduced to a value close to the instantaneous value of the voltage on the remaining part of the winding 3, and the diode 9 is closed.

Since at this point the voltage on the capacitor 14 is less than the voltage on the capacitor 10, the energy injected in the dissipation windings of the transformer 1, after turning on the thyristor 4, is transferred to the capacitor 14, flooding it.

Thus, the effect of this energy on the charge processes of the main storage capacitor 10 is eliminated and, accordingly, the accuracy of the amplification by the amplitude of charge accumulation increases.

With the beginning of the subsequent half-cycle of the supply voltage, irikladyvayem to the winding 2, from the winding 3, the start signal of the block 11 is issued and the capacitor 10 is discharged, after which the charge and discharge cycles of this capacitor ieriodically repeat.

Subject invention

The amplitude control device of the excitation generator of the emission spectra according to ed. St. No. 347874, characterized by

that, in order to improve the control of the amplitude of the charge voltage of the storage capacitor, it additionally contains a second diode connected in series to the charging circuit in accordance with the first diode, and a circuit from a series-connected third diode and a second terminating capacitor connected by a resistor connected between the point of the parts of the charge secondary winding of the transformer and

the common point of the first and second diodes, the third and the first diodes are connected to each other with the same electrodes, and the control thyristor control unit consisting of the threshold device loaded by the driver of switching pulses is connected by the input terminals to the first storage capacitor through the first and second diodes.

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