SU1293787A1 - Device for protection of power source group with output leads which are heteropolar with respect to common bus - Google Patents

Abstract

The invention relates to electrical engineering and can be used in devices and power systems of electronic equipment. The aim of the invention is to enhance the functionality by providing overvoltage protection on one or more output pins. When separating the leads of a group of power supplies 8 into pairs of opposite polarity and connecting to each of these pairs of leads, dividers 1 and 2 connected by middle points to the key inputs on transistors of different conduction types included in different discriminators 9 and 10 increase, for example, voltage with negative polarity leads to unlocking the key made on a pnp type transistor, and increasing the voltage of a positive polarity unlocking the key made on a pnp type transistor. 1 il. s (O e a ftVT; º P B -U1 -U2 tUlfUf U5 7 f5 / V G5 o so oo h 00 -vj

Description

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The invention relates to electrical engineering and can be used in devices and power systems of electronic equipment.

The purpose of the invention is to enhance the functionality by providing overvoltage protection on one or more output pins.

The drawing shows a schematic diagram of a device for the protection of a group of power sources with different polarity relative to a common bus output pins.

The device contains resistive voltage dividers, combined into groups 1 and 2, connected to negative 3, 4 and positive 5-7 output pins of power supply 8 in such a way that the beginnings of one of the dividers from group 2 are connected to one pair pins of a group of power sources, the beginnings of other dividers from groups 1 and 2 are connected to another pair of different polarity voltages of a power supply circuit, etc. If for some voltage output there is not enough voltage output of another polarity to form a raenopolar pair, then the output of the voltage output of another polarity that is already used will be used. The inputs of one discriminator 9 are connected to the outputs of dividers 1, the inputs of the other discriminator 35 are connected to the outputs of dividers of group 2, one of the inputs 11 of the discriminator 10 is connected to the output 12 of the discriminator 9. The output I3 of the discriminator 1.0 is connected to a shut-off input 14 of the safety switch 15, which includes an inertial link to prevent false alarms of the device at the moments when the group of power sources 8 is turned on.

The device works as follows: time.

In case of a short circuit in the load of one or several positive terminals 5-7 of the source group 8, a signal appears on the corresponding output of the resistive dividers, opening one or several transistors of the discriminator 9, which bypass the negative polarity signal at the input 11 of the discriminator 10, which leads to the opening resistor shunting a positive output signal

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13 discriminator 10. The disappearance of the signal of positive polarity at the input 14 of the safety switch 15 is a signal to the protection operation and to disconnect the power supply 8. The circuit works similarly when the voltage level decreases (the mode is possible during an overload). .

When overvoltage on one or several positive terminals 5-7 of the power supply source B group, a signal appears on the corresponding output of the resistive dividers of group 2, opening one or more transistors of the discriminator 10, which bypass the signal of positive polarity at the output 13 of the discriminator 10 and at the input 14 of the safety switch, which is a signal to trigger the protection, and the disconnection of the sources of absorption.

In case of a short circuit in the load of one or several negative output pins 3 and 4 of the group of power supply sources 8, a signal appears on the corresponding output of the resistive dividers 2 that opens one or more discriminator transistors. Y, which leads to the disappearance of the positive polarity signal at the input 14 safety switch. This is a signal to trigger the protection and disconnect the power supply 8.

The circuit works similarly with a decrease in the voltage level (the mode is possible with an overload). When several negative output pins 3 and 4 of the power supply sources 8 are overpowered on the same output, a signal appears on the corresponding output of the resistive dividers 1 that opens one or more transistors of the discriminator 9, which bypass the negative signal 11 at the input 11 of the discriminator 10, which leads to the opening of the transistor shunting the positive signal at the output 13 of the discriminator 10. The disappearance of the positive polarity signal at the input 14 of the protective switch 15 is a signal to trip Protecting and disconnecting the power source 8.

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By changing the ratio of resistors included in the resistive dividers, the device can be adjusted for each input so that

By changing the ratio of resistors included in the resistive dividers, the device can be adjusted for each input so that

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may trigger with a decrease or increase in voltage by 10% or more. The use of the proposed device allows the protection of a group of power sources as from short-circuit currents. and overloads and overvoltages, without the use of special additional overvoltage protection.

Claims (1)

Invention Formula A device for protecting a group of power sources with output terminals with different polarities relative to the common bus, containing two discriminators made on transistors, the emitters of which are connected to the common bus, collectors to the output of the corresponding discriminator via a resistor connected to its power output, and the bases are connected to the inputs discriminators, the voltage dividers are each complete. of two consequently connected resistors and a common point connected to one of the inputs of one discriminator, the output of one of which is under the editor S. Lisin Compiled by O. Mescher Kova Tehred I.Popovich Proofreader A.T. Order 392/56 Circulation 619 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 O five 0 five The key is connected to one of the input pins of the voltage divider, the midpoint of which is connected to the input of another discriminator, whose output is connected to the input of the protection actuator equipped with a delays block, and the power terminals of the discriminators, respectively, made on npp transistors and pnp, are intended to be connected, respectively, to any negative and any positive output terminal of the protected group of power sources, characterized in that, in order to expand the functional by providing the possibility of protection against overvoltages on one or. several output pins, pins of voltage dividers, middle points connected to the inputs of one discriminator, are connected in pairs to pins of voltage dividers, middle points connected to the inputs of another discriminator, and are intended to be connected to any two different output power source pins.