SU1153319A1 - Stabilizing device with complex protection - Google Patents

Abstract

1. A DEVICE FOR STABILIZATION WITH COMPLEX PROTECTION, containing a stabilized power source with complex protection, consisting of a stabilizer connected with an output to the output terminal, an actuating relay, the disconnecting contact of which with one output is connected to the power input of the stabilizer, and the other to the input terminal, variable resistors, amplifying element with self-blocking on the transistor, thyristor, resistors and capacitor, with the transistor emitter connected to the output terminal, the collector through resis op - to the common bus, to the first capacitor lead and to the control lead of the thyristor connected by power leads to the common bus and to the first lead, winding of the executive relay, the second lead of which is connected to the input terminal and to the second lead of the capacitor, characterized in that in order to increase the reliability of operation, a lmbdytransistor and a stabilizing node are introduced into it, the lmbda transistor is connected to a bipolar and a field-effect transistors of different types of conductivity, the drain of the field-effect transistor is connected to a common bus, the source - to the emitter of the bipolar transistor, the gate is connected to the collector of the bipolar transistor, to the base of the transistor of the self-locking amplifying element and to one of the extreme terminals of the first variable resistor, the second extreme and middle terminals of which are connected to the output terminal, the stabilizing node is connected by inputs to the power input of the stabilizer and C /) to the common bus, and the output leads to the extreme leads of the second variable resistor, the middle pin of which is connected to the base of the bipolar transistor. 2. The device according to claim 1, characterized in that, in order to expand the functional capabilities, it is equipped with a second, similar, stabilized pitaSAE source with no integrated protection, is switched on in series with the first, and when this is CD, each actuator of each of the stabilized power supplies With complex protection, an additional closing contact is introduced, the terminals of which are connected in parallel with the thyristor of the amplifying element with self-locking of the opposite stabilized power source with a computer eksnoy protection.

Description

The invention relates to electrical engineering and can be used in power supply devices for electronic equipment. The purpose of the invention is to increase the reliability of the device and to expand its functional capabilities. FIG. 1 shows a circuit diagram of a device containing one voltage stabilizer; in fig. 2 - principal electric circuit of a device containing two series-connected voltage regulators, a multi-polar voltage source; in fig. 3 - current-voltage characteristics of a diode and an L-transistor A stabilizing device with complex protection (FIG. 1) contains an executive relay 1, the break contact 2 of which is connected to the power supply circuit of the stabilizer 3, a self-blocking element with self-blocking 4, in the input circuit of which is applied the transistor 5, the collector of which is connected through the capacitor 6k to the input terminal of the stabilizer and through the resistor 7 to the common busbar and to the control terminal of the thyristors 8, the power terminals of which are connected in series with the winding of the executive relay 1 between do input terminal and common bus. The connection point of the cathode of the thyristor 8 with the winding of the relay is connected through a resistor 9 to the common bus. The overload sensor 10 is made on an i-transistor, consisting of a field-effect transistor 11, the drain of which is connected to a common voltage, the source is connected to the emitter of a bipolar transistor 12 of the opposite type of conductivity, the base of which is connected to the midpoint of the subscript resistor 13 connected in parallel the zener diode 14 of the stabilizing node 15. The collector of transistor 12 is connected to the base of the transistor 5, the gate of the transistor 11 and through the resistor 15 to the output circuit: the stabilizer 3. The stabilization voltage of the zener 14 of the stabilizing node 15 must be higher output voltage of stabilizer 3. When using two successively connected stabilizers (Fig. In the executive relay 1 of each of them, an additional closing contact 17 is inserted, the outputs of which are connected parallel to the thyristor 8 of the amplifying element 4 of the opposite device. The device works as follows When turned on, the input voltage Ugx increases abruptly to the nominal value, the inrush of current through the capacitor 6 prevents the turning on of the thyristor 8, the cathode potential of which is determined by HAND voltage across the resistor 9 connected parallel to the thyristor 8, and the output unit is set the nominal value of the output voltage. Resistor 13 sets the maximum current through the D-transistor 10. Resistor 16 sets the threshold for protection. Through the D-transistor 10, the maximum current flows (Fig. 3), the voltage drop across the resistor 16 creates a sufficient bias for the current to flow through the protection transistor 5, respectively, the voltage across the resistor 7 exceeds the voltage drop across the resistor 9, which enough to keep the thyristor 8 in the on state. When the output voltage changes by more than the protection threshold, the current through the α-transistor drops sharply, transistor 5 closes, thyristor 8 turns on, relay 1 operates, and pin 2 turns off the power to the stabilizer. To re-enable (after eliminating the cause that caused the protection device to operate), it is necessary to turn off and then turn on the power supply again. When using two consecutive identical stabilizing devices (Fig; 2) when changing the output voltage in one (or both simultaneously, temporarily), the device is closed, as in the previous case (Fig. 1), and turning on the relay 1, along with with the disconnection by contact 2 of the power supply to the stabilizer, it is switched on by an additional contact 17 of the relay 1 of the fireproof device, thereby disconnecting it also from the mains. Compared to the prototype, where an overload diode consisting of two field-effect transistors is used as an overload sensor 10, the voltage drop on

transistors and, correspondingly, the gate bias of the other transistor, as a result of which both transistors are locked, in the proposed device the feedback is realized with the help of a bipolar transistor 12, the current through the feedback of the transistor changes as a function of Ur-U with the value

where (Jg is the voltage of the base of the bipolar

transistor;

Ugiv - voltage drain - source across the left transistor-.

2G feedback ratio

cascade

as a result, the ascending branch of the current-voltage characteristic has a much steeper character than that of the D-diode (Fig. 3).

The proposed device, as a result of the introduction of an I-transistor into it, makes it possible to increase the accuracy of the protection operation when the output voltage is lowered due to an overload of the current regulator and, thus, to increase the reliability of its operation.

Claims (2)

1. STABILIZATION DEVICE WITH INTEGRATED PROTECTION, containing a stabilized power supply with integrated protection, consisting of a stabilizer connected by a power output to the output terminal, an executive relay, the NC contact of which is connected to the power input of the stabilizer by one output, and the other to the input terminal, variables resistors, an amplifying element with self-locking on the transistor, thyristor, resistors and capacitor, and the transistor is connected by an emitter to the output terminal, and the collector through the resistor to common bus, to the first output of the capacitor and to the control output of the thyristor, connected by power leads to the common bus and to the first output, the windings of the executive relay, the second output of which is connected to the input terminal and to the second output of the capacitor, characterized in that, in order to increase reliability of operation, a lambda transistor and a stabilizing unit are introduced into it, and the lambda transistor is made on bipolar and field-effect transistors of different types of conductivity, the drain of the field-effect transistor is connected to a common bus, the source to the bipo emitter a transistor, the gate is connected to the collector of the bipolar transistor, to the base of the transistor of the mentioned amplifier element with self-locking and to one of the extreme terminals of the first variable resistor, the second extreme and middle conclusions of which are connected to the output terminal, the stabilizing node is connected by inputs to the power input of the stabilizer and to the common bus, and we leave conclusions to the extreme terminals of the second variable resistor, the middle terminal of which is connected to the base of the bipolar transistor. 2. The device according to π. 1, characterized in that, in order to expand the functionality, it is equipped with a second similar stabilized power supply with integrated protection, connected in series with the first, while an additional make contact is inserted into the actuating relay of each of the stabilized power supplies with integrated protection, the terminals of which are connected parallel to the thyristor of the amplifying element with self-locking of the opposite stabilized power source with integrated protection. 1153'319