SU725206A1 - Arrangement for pulse transformation - Google Patents

Description

The invention relates to a pulse technique, in particular to a device. STV transformation, and can find application in measuring generators, pulse drivers, radar and other systems. A device for transferring pulses is known, which contains a field-effect transistor connected in parallel to the primary or secondary winding of a transformer 1. The UstrytBO does not provide pressure oscillations during a pulse and transmits pulses of relatively low power. A pulse modulator is known, comprising a forming line, a switching element, an output pulse transformer and a load, after which an additional artificial line is included to improve the shape of the output pulse. The disadvantages of this modulator are that the size and weight of the additional line become larger than at the forming line, esl transformer. raising. In addition, when an additional line is connected in series with a load, voltage loss is inevitable, which is 5-10%. The closest to the present invention is a device containing a pulse transformer, in series with the primary winding of which a chain of parallel connected resistors and a charging circuit is introduced in the form of a nonlinear inductance, saturated with a pulse front (3. The disadvantage of this device is a significant output pulse duration. due to the critical charge regime of the parasitic capacitance of the transformer. The purpose of the invention is to reduce the duration of the front of the transformed pulse. aets in that the device for transforming the pulses comprising a pulse transformer in which a primary winding resistor is included in series, parallel with the primary winding inserted circuit consisting of series-connected diode and a shunt resistor forming an open line.

The drawing shows the principle of the electrical circuit device.

The device for transforming pulses contains a pulse transformer 1, a diode 2, resistors 3 and 4, an open forming line 5.

The device works as follows

In the absence of input voltage, the parasitic capacitance of transformer 1 and line 5 is discharged. When a rectangular voltage pulse is fed to the input, an oscillatory charge starts with an amplitude through the resistor 4 of the parasitic capacitance of the transformer and through the diode 2 of the line 5,.

After a time t, the voltage, from zero, reaches a maximum, K

1 +

- , (one)

UCM- and

l - where Uu- amplitude of the applied pulse; . R is the value of resistor 4; line resistance value 5; .

R, RA

x

uHn

2-Lf (R + R.

otjCtJc - attenuation and proper

the frequency of the parasitic circuit ;, - inductance dissipation

transformer 1;

. C - parasitic capacitance of the transformer 1. .

By selecting the value of RA, the resistance of line 5 ensures that the condition

.

(2)

TO

Substituting the condition (2) in the ratio (1), get

(3)

) Uo

UCK, (t

i.e .; maximum voltage on the parasitic capacitance of the transformer 1 paiBHO voltage applied to the input of the device. If the double-run time of the wave in line 5 is equal to the duration of the front t0, then at the time t- t the voltage on line 5 exceeds the voltage on the primary winding of transformer 1. Therefore, diode 2 is locked by disconnecting line 5 from the primary winding of transformer 1, for example the condition on which increases to the value of Ua. Considering that condition (3) is fulfilled since tt, further oscillations in the parasitic circuit cease, parasitic oscillations on the top of the output pulse are absent.

The duration of the front of the output pulse is determined by the ratio

57

t. ) L, C,

(four)

The front duration is obtained for the critical mode, when

 g (...

.. 7i l- /

The ratio t Kp / t0 1 reaches very large values depending on the parameters of the circuit, showing the gain in the duration of the front of the output pulse in the oscillatory mode compared to the critical one.

The described processes take place in the case of a loaded transformer.

The device does not impose any restrictions on the design of the transformer 1 and has practically no amplitude and energy losses for pulse shape correction, since the output resistance of the signal generator is usually used as a resistor 4, which is less than 10% of the load resistance for voltage sources with capacitive storage or wave resistance of the parasitic circuit

Taking into account that with a small attenuation of the parasitic circuit from the relation (2),

. ,

find the effectiveness of the device in comparison with the known

.

.

) -y - 38

t;

The high efficiency of the device is achieved without significant energy loss.

Therefore, the device makes it possible to reduce the duration of the front of the output pulses ten times preserving a flat top and with a loss value of not more than 0.1%. The absence of restrictions on the design of the impulse transformer itself makes it possible to use the device for commercially manufactured Products, expanding the applicability in the national economy, for example, in measurement generators and modulators, radar systems ,.

Claims (2)

1. -Patent of Germany No. 233401, cl. H 03 K 5/01, 725206 2. USSR author's certificate №517143, cl. H 03 K 3/53, 1976.. USSR Copyright Certificate №205074, class, H 01 F 19/08, 1967,