SU368717A1 - GENERATOR OF IL \ PULTS - Google Patents

Description

one

The invention relates to the field of electrical engineering and can be applied in electrical devices for various purposes, such as constant voltage converters.

A pulse generator is known that is made according to a bridge circuit, the two arms of which are formed by capacitors connected to the power supply buses, and the other two by collector-emitter gaps

transistors of different types of conductivity. The transistor bases are connected via resistors with their collectors, and the primary winding of the pulse transformer is included in the bridge diagonal, the secondary winding of which is connected between the common point of the emitters of the transistors and their bases.

The purpose of the invention is to increase the efficiency, reliability of the device and the possibility of obtaining both continuous electric oscillations of a rectangular shape and packets of pulses.

This goal is achieved by the fact that in the proposed generator one of the conclusions of the secondary winding of the pulse transformer is connected to the bases of the transistors through the additionally introduced corresponding capacitors.

The drawing shows a circuit diagram of the proposed generator.

The capacitors 1, 2 and the emitter-collector gaps of the transistors 3 4 form a bridge connected to the power source 5. The primary winding 6 of the pulse transformer 7 is connected to the diagonal of the bridge, connecting the emitters of the transistors 5 and 4 to the common point of the capacitors Y and 2. The secondary winding 8 of the transformer 7 connected in a T-shaped circuit with capacitors 9 and 10. Its second output is connected to the emitters of transistors 5 and 4, the bases of which are connected to their collectors through resistors 11 and 12.

When the supply voltage is turned on, the transistor opens, which has a higher initial current, for example, transistor 4. A current flows through the primary winding 6 of the transformer 7. A blocking process occurs in the generator, during which capacitor 2 is completely discharged and capacitor 1 is fully charged.

At the same time, the current of the secondary winding 8 flowing through the emitter-base transition of the open transistor 4 charges the capacitor 10. At the end of the overcharging of the capacitors 1 and 2, the current in the secondary winding 8 of the transformer 7 becomes zero. The voltage across the transistor 3 becomes equal to the supply voltage, and due to the galvanic connection of the base to the collector, it opens. The discharge of the capacitor 1 through the transistor 3 begins. Through the windings of the transformer 7 currents begin to flow, the direction of which is opposite to the currents flowing in the first half period. This ensures that the opening transistor 3 is kept in an open state, and the closing transistor 4 is kept in the closed state. This starts charging capacitors 2 and 5 and discharging capacitors 1 and 10.

If the discharge time constant of capacitors 9 and 10 is longer than the constant recharge time of capacitors 1 and 2, o the charged capacitor 9 or 10 is not fully discharged during the next half period, and a charge builds up on it. the capacitor 9 or 10 becomes greater than the opening voltage of the transistor, the generation stops, and a pause occurs during which the capacitors 9 and 10 are discharged through resistors // and 12, respectively. After the discharge of the capacitors 9 and 10, the generation is resumed, and the generator produces the next series of pulses. The number of pulses in a series depends on the parameters of the circuit elements and the supply voltage.

If the constant of the discharge time of the capacitors 9 to 10 is less than the constant time of the recharging of the capacitors 1 to 2, the generator operates in the auto-oscillatory mode.

Subject invention

A pulse generator made according to a bridge circuit, the two arms of which are formed by capacitors connected to the power supply wiring, and the other two by collector-emitter gaps of transistors of different conduction types, the bases of which are connected through resistors to their collectors, and the primary winding of the pulse transformer is connected to the diagonal of the bridge,

a secondary winding of which is connected between the common point of said transistors and their bases, characterized in that, for the purpose of boosting. KPD, reliability and the possibility of obtaining as continuous

rectangular electrical oscillations as well as bursts of pulses, one of the conclusions of the secondary winding of the pulse transformer is connected to the bases of transistors through the additionally introduced corresponding

capacitors.