SU508933A1 - Key management device - Google Patents

Description

one

The invention relates to the field of pulsed technology, in particular, to devices for generating pulse signals, and can be used in computer units and automation equipment as an electronic key, current driver for memory, etc.

A key control device is known, comprising transistor switches of switching on and off currents connected in series with the load, the emitter of the switch-breaking current transistor is connected to the first output of the device, and the collector of the switching current switch is connected to the second output.

However, the known device has a narrow field of application and is not very fast.

The aim of the invention is to expand the possibilities of use.

For this, two diodes and a resistor are additionally introduced, the cathode of the first additional diode is grounded, and the anode is connected to the transistor base of the switching current key through an additional resistor, the second additional diode is connected between the base and the emitter of the switching current transistor, and the cathode to the base.

To increase the speed, a current-carrying resistor and a capacitor are additionally introduced, and the current-carrying resistor

connected between the outputs of the device, an additional capacitor - between the base of the transistor of the switch-off current key and the collector of the transistor of the switch-on current key, and the load connected to the emitter of the switch-current transistor.

FIG. 1 is a circuit diagram of the proposed device used to control the relay coil; in fig. 2 - two variants of its use for controlling transistor switches. The device contains an input current switch on transistors 1 and 2, a switch-off current switch on transistor 3, a switch-on current switch on transistor 4, an emitter follower on transistor 5, a circuit for fixing and shifting a level on transistor 6, zener diodes 7, 8 and diodes 9, 10. In addition, there are diodes 11-14 and resistors 15-16. If the load is an electromagnetic relay 17, then no additional elements are required. When using a device for controlling transistor switches, a capacitor 18, a resistor 19 and a transformer 20 can be used. In this case, the resistor 19 should be connected between the outputs 21 and 22 of the device, and the capacitor 18 between the base

Claims (2)

transistor 3 and output 22. In the initial state, when logical signals are input to the device, opening transistor 1 and closing transistor 2, the voltage on the collector of transistor 2 is detected by diode 12 and is approximately 4-0.7 V. the collector of transistor 1 is fixed by an open transistor 6. The base potential of transistor 6 is different from. The potential of the power supply bus is -5.2 V by the magnitude of the voltage drops at Zener diode 7 and diodes 9, 10. The base potential of transistor 5 differs from the base potential of transistor 6 by the voltage drop value of the base-emitter voltage of transistor 6 and the voltage drop at Zener diode 8 and It is, of course, more positive than the potential of the power supply of -5.2 V by the magnitude of the voltage drop across the diode. The emitter potential of transistor 5 is close to the potential of a supply voltage of -5.2 V, which ensures the closed state of transistor 4. The base potential of transistor 3 differs from the collector potential of transistor 2 by the amount of voltage drop across resistor 15 from the current determined by the value of resistor 19. The voltage drop across the resistor 15 is approximately 0.2 V, so the base potential of transistor 3 is -f 0.5 V, which corresponds to the half-open state of transistor 3, because its emitter is shorted to ground by the primary winding of the transformer 20. When At the input of the device of logical signals opening transistor 2 and locking transistor 1, the collector potential of transistor 2 is detected by diode 11 at a level of -0.7 V. The collector potential of transistor 1 rises, which leads to an increase in the potential at the base of transistor 5 and opening of transistor 4. The transistor 4 is turned on and provides the switching current to the base of the output transistor. The magnitude of the switching current is set by the magnitude of the resistor 19. The capacitor 18 is recharged by the current flowing through the diode 13, the transistor 4 and the primary winding of the transformer 20, providing a forced turn-on of the output transistor. Nonlinear feedback through diode 14 prevents the saturation of transistor 4. Transistor 3 locks up and remains closed until the input signals are terminated. G the end of the input signal transistor 4 is closed. Charged capacitor 18 through the resistor 19 turns out to be connected to the base-to-emitter junction of transistor 3. The discharge current of the capacitor, which is the base current of transistor 3, turns it on. Transistor 3 with an emitter current in excess of the capacitor discharge current turns off the output transistor. Since the discharge current of the capacitor 18 is close in magnitude to the switching current of the output transistor, and the current gain of transistor 3 is equal to I, the device implements a forced off mode of the output transistor. Thus, the device, which is supported by standard signals from logic circuits, is able to turn current on and off in the relay winding, and also can directly control a pnp transistor with a grounded emitter, or a transistor of any type conductivity through an isolation transformer. In addition, the proposed device is easily implemented as an integrated circuit. Claim 1. A device for controlling a key containing transistor switches of switching on and switching currents connected in series with the load, the emitter of the switching current switch transistor being connected to the first output of the device, and the collector of the switching current switch connecting to the second output, characterized in that in order to expand the possibilities of use, two diodes and a resistor are additionally introduced, the cathode of the first additional diode is grounded, and the anode is connected to the base of the switch transistor off Switching current through an additional resistor, the second additional diode is connected between the base and the emitter of the transistor key of the switching current, the cathode to the base. 2. The device according to claim 1, characterized in that, in order to increase speed, a current supply resistor and a capacitor are added, the current supply resistor is connected between the device outputs, the auxiliary capacitor between the switch base of the switch current and the switch of the current transistor, and load is connected to the emitter of the transistor of the switch-off current switch. 0 + 58 -0-5,28