SU391734A1 - ALL-UNION - Google Patents

Description

one

The invention relates to the field of radio engineering, in particular to electronic time relays, and can be used in automation devices.

A time relay is known that contains a pulse generator, a switching device, a storage capacitor, and an output amplifier on a transistor, to the base of which is connected one end of a string of two series-connected diodes, and one of the plates of the storage capacitor is connected to the junction of these diodes.

The purpose of the invention is to increase the exposure time with a wide range: m adjustment.

For this, the switching device is made in the form of two transistor switches, the collector of the transistor of one of which is connected through another offset diode plate of the storage capacitor and through the reverse-offset diode and separation capacitor to the collector of the transistor of the other switch, and the other the end of the chain pz two series-connected diodes.

The drawing shows a circuit diagram of the proposed device.

The device contains a low-frequency pulse generator 7, a switching device in the form of two switches on transistors 2 l 3, positive and charging capacitors 4 and 5, a chain of two series-connected diodes 6 and 7, an output amplifier of transistor 8, resistors 9-13 and diodes 14, 15, the output device 16.

The operation of the device is based on the principle of successive accumulation of charge on the capacitor 4 with subsequent comparison

potential with reference voltage across resistor 12.

Transistors 2 and 3 operate in antiphase and are controlled by the output pulses of the generator.

With the arrival of the triggering pulse, the transistor 2 is unlocked and the capacitor is charged before the voltage of the power source through the open transistor 2, the diode 14 and the resistors 11, 12.

A positive potential appears on the capacitor plate 5 connected to the collector of transistor 2. In the next period, when transistor 3 is open and transistor 2 is closed, capacitor 5 is discharged and

its charge is completely transferred to the capacitor 4, and then charged along that circuit in the opposite direction simultaneously with the capacitor 4, as two series-connected capacitors, one of which

(Capacitor 4 already has a charge received from the other, later on with the frequency of the generator and, depending on the size of the capacitor 5, the capacitor 4 will receive a charge both from the capacitor 5 and from the source of lithium, which charges two series-connected capacitors 4 and 5. The second component of the charge will vary all the time depending on the magnitude of the charge on the capacitor 4. The duration of the output pulses of the device is controlled by the variable resistor 12. Diodes 6, 7 limit the effect of different polarity on the change The value of the magnitude of the in-charge on the capacitor 4. When equality of the potentials on the capacitor 4 and the resistor 12 is reached when the transistor 5 is open, the transistor 8 is unlocked and outputs a signal to the output device 16.

Subject invention

A time relay containing a pulse generator, a switching device, a storage capacitor and an output amplifier at the transistor, to the base of which is connected one end of a string of two series-connected diodes, and one of the storage capacitor plates connected to the connection point of these diodes, characterized by the purpose of increasing time exposures with a wide range of adjustment, the switching device is made in the form of two transistor switches, the collector of the transistor, one of which is connected through For a displaced diode with a different plate of a storage capacitor and through a reverse biased diode and a coupling capacitor with the collector of a transistor of another switch, the other end of the chain of two series-connected diodes is connected to the junction of the coupling capacitor with the diode.