SU445135A1 - Sawtooth generator - Google Patents

Description

The invention relates to a pulse technique.

According to the main author. St. te 347901 is a sawtooth voltage generator, which contains a current-stabilizing two-terminal capacitor with a discharge switch, an additional capacitor for the purpose of charging and discharging.

The aim of the invention is to increase the utilization rate of the supply voltage.

In the proposed generator, the goal is achieved by introducing an additional current-stabilizing two-terminal device on the transistor. The drawing shows a schematic diagram of the proposed generator.

The generator contains a current-stabilizing two-pole device on the transistor I and resistors 2-4, a capacitor 5. discharge switch 6, an additional current-stabilizing two-pole switch on transistor 7 and resistors 8-10, an additional capacitor II, discharge switch 12 (the power sources are not shown in the diagram).

The sawtooth generator operates as follows.

With keys 6 and 12 open, capacitor 5 is charged along. circuits: common wire, capacitor 5, transistor I, resistor 4, minus power supply; the capacitor II is charged across the circuit: common wire, resistor 10, transistor 7, capacitor AND, minus the power source. At the same time, as the potential on the bottom plate of the capacitor II increases, the base potential of the transistor I increases according to the linear law, and thereby maintains the current constant at the output of the controlled current-stabilizing two-terminal device during the working stroke. Resistors 8 and 9, which form a voltage divider, provide the operating current for the base of the transistor 7. Resistor 10 improves thermal stabilization and determines the charging current of capacitor II. The divider formed by resistors 2 and 3 determines the initial potential of the base of the transistor I. The magnitude of the charging current of the capacitor 5 is determined by the resistor 4. When the keys 6 and 12 are closed, the capacitor 5 is discharged through the internal resistance of the key 6,

and the capacitor II - through the internal resistance of the key 12.

Upon the subsequent opening and closing of the keys, the process is repeated.

Subject invention

Generator sawtooth voltage aut. St. No. 3 -7901, characterized in that, in order to increase the utilization rate of the supply voltage, an additional current-stabilizing two-port on the transistor, the collector of which is connected to the base of the transistor of the controlled current-stabilizing two-pole, is inserted into it with an additional capacitor and a discharge key.

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