SU385390A1 - DEVICE FOR RECEIVING MULTIPLE STEPS VOLTAGES WITH A FELTED FRONT - Google Patents

Description

one

This invention relates to radio-engineering. The device can be used in automation and programming systems.

A device is known for producing several step voltages with a sawtooth front (ed. St. 366576) shifted relative to each other — at the front of the front, containing a chain of transistors, each subsequent of which is connected by an emitter to the base of the previous one, and the first is connected to the current source, the base of the last transistor is connected to the bias source, each collector is connected to the output and to the time by the reference capacitor.

With the autogenerator mode provisioning slot in the described device, the second ends of the time of the driving capacitors are connected to the transistor collector entering the multivibrator, whose input is connected to the last output of the device.

Diagram of the device shown in the drawing.

At the beginning of each cycle, there are no voltages at the output terminals 1–4, transistor 5 is locked, and transistor 6 is saturated with current passing through resistor 7 and diode 8; through the resistors 9, 10 also passes the current from the source 11. The capacitor 12 begins to charge with the current flowing through the transistor 13. In this case, the transistors are locked with a positive potential from the zener diode / 7,

supplied to their base via diodes / S-2L. When the voltage across the collector of the transistor 13 turns out to be equal to the (constipation) voltage of the zener diode 17, the transistor 14 opens and the capacitor 21 starts to charge; when the voltage on the capacitor 22 reaches 1 the voltage of the zener diode 17, the transistor 15 opens and the subsequent capacitor starts to charge, etc.

When the voltage on the last capacitor 23 becomes equal to the voltage of the breakdown of the zener diode 24, the transistor 5 opens and the transistor 6 closes. The voltage at the terminals 25 tends to IK to the source voltage //. At the same time, capacitors 12, 21-23 are recharged across the circuit: resistor 10, power source 11, zener diode 26, and base-collector junctions of transistors 13-15. There is voltage at all outputs of -4 during reloading.

As the voltage difference across the terminals 25 and the source voltage, the current through the transistor 27 decreases. When this difference reaches the voltage of the diode 28, the current becomes zero, the transistor 5 closes and the transistor 6 becomes saturated, the voltage at terminals 5 and at the output terminals / -4 becomes equal to zero, the device assumes the initial position,

further, the device operates according to the described cycle.

To recharge capacitors through the base-collector transistors, you can turn off the switch 26 connecting the ends of the capacitors to ground. This eliminates the need for switching diodes. But at the same time through the emitter junction of the last transistor current flows all capacitances. In order to quickly recharge them, the resistor W has a small resistance, which, when opening the key, leads to the dissipation of significant POWER.

Subject invention

A device for producing several step stresses with a saw-tooth front, shifted relative to each other at the front time, according to the ed. St. No. 366576, containing a chain of transistors, each subsequent of which is connected by an emitter to the base of the previous one, and the emitter of the first is connected to a current source, the base of the last transistor is connected to an offset source, each collector is connected to an output and a time reference capacitor, characterized in that in order to ensure a-in-generator mode of operation, the second ends of the time of the driving capacitors are connected to the collector of the transistor, which enters the multivibrator, the input of which is connected to the last output of the device.

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