SU403031A1 - POWER VOLTAGE GENERATOR - Google Patents

Description

one

The invention relates to transistor oscillators of a sawtooth and pulsed voltage with self-excitation and can be used in master oscillators of television sweeps, frequency dividers and other radio engineering devices where it is necessary to obtain sawtooth voltages with high linearity and temporal stability and simultaneously pulsed voltage.

According to the main author. St. No. 311383, sawtooth voltage generators with self-excitation on two transistors of different conductivity are known.

However, in a number of cases, it is necessary to obtain a voltage not only of a sawtooth shape, but also in the form of U-shaped pulses.

The proposed generator differs from the known ones in that the collector circuit of the transistor operating in the key mode, in series with the load resistance and time of the driving capacitor, includes a diode for the collector current between the collector of the transistor and the pole of the power supply and the transistor and the base of the second transistor is connected to an accelerating capacitor, while the voltage of the pulse form is removed from

additional load resistance, resulting in increased functionality of the generator.

The drawing is a diagram of the proposed generator.

A diode 4, open to the collector current, is connected between the collector of transistor 1 and the junction point of capacitor 2 and resistor 3; A load resistor 5 connected to the power supply pole and a capacitor 6 connected to the base of the transistor 7 are connected to the collector of transistor 1. The impulse voltage is removed from the resistor.

5 is point A, and sawtooth is from point B or B. In switching mode, transistors 1 and 7

and diode 4 is open, capacitors 2 and 6 recharge. After tipping the circuit, transistor 1 is locked, and the potential of point A due to resistance 5 drops to the potential of the power source, which causes the diode 4 to be locked.

6 serves to accelerate the processes of overturning the circuit from one state to another, which increases the steepness of the fronts of the generated pulses and improves the conditions of self-excitation of the circuit. It has a small capacitance compared with capacitor 2 and does not affect the linearity of the saw voltage. At resistance 5 are allocated

pulses are U-shaped with a duration corresponding to the switching state of the switching mode and an amplitude close to the voltage of the power source. To lock diode 4 during the whole process of forming the forward path of the saw-tooth voltage, the potential difference between the positive bus and the bus to which additional resistor 5 is connected must be equal to or exceed the voltage of the generator. If the required amplitude of the pulse does not exceed the voltage of the generator, then the resistance 5 is connected to the negative bus of the power source. Otherwise, it is connected to a voltage source corresponding to its desired pulse width. The pulse duration (reverse) can be adjusted by changing the resistor 8.

Improvement of the sawtooth generator relates to its various modifications and improvements.

Subject invention

Generator sawtooth voltage aut. St. No. 311383, characterized in that, in order to expand the functionality of the generator, a semiconductor diode is connected between the triode collector operating in key mode and the load resistance, the triode collector connected to the anode, an additional load resistance connected to the power supply pole, and an additional an accelerating capacitor, the second lining of which is connected to the base of the triode forming a sawtooth voltage.