RU2685405C1 - Method for adjusting the value of consumed current of initiating devices - Google Patents

Abstract

FIELD: protective devices.SUBSTANCE: invention relates to cable network protection and airborne equipment from effects of high current loads. To adjust the current as a resistive element is used a piece of wire from an electrically conductive material with high specific resistance and heat-resistant insulation, included in the power cable and capable of providing high power dissipation when operating in pulsed modes. Cable resistance, as well as an initiating device, is adjusted by changing the length of a piece of wire in manufacture of the cable so that its temperature does not reach the insulation destruction temperature.EFFECT: improvement in the weight and size characteristics of initiating devices is achieved, the possibility of adjusting the internal resistance and current consumption without the use of electro-radio products, improving reliability and manufacturability of initiating devices.5 cl, 2 dwg

Description

The present invention relates to the field of protection of the cable network and on-board equipment of spacecraft against the effects of increased current loads when triggering devices of the metering locks of transformable mechanical structures are activated, by adjusting their internal resistance.

From the current level of technology known method of limiting current, implemented in the device "resistor with increased power dissipation and method of its manufacture" (patent RU 2339103 C1, NC 1/032, 11/20/2008), containing a dielectric substrate on which a film resistive layer is placed, connected to it by contact edges, the current-carrying and grounding pads and the dielectric heat-conducting layer on the side opposite to the dielectric substrate, on the facing sides of the resistive film.

There is a method of current limiting implemented in the device "Resistor for regulating the frequency of rotation of the fan motor for use in the air conditioner" (patent RU 2365073 C2, Н01С, 12.04.2006), comprising a base body, a radiator attached to the upper part of the base body, a printed circuit board resistor circuits, covered with insulating layers and installed in the radiator, as well as a reinforcement plate, isolating the resistor circuit from the outside world.

Also known is a current limiting method implemented in a “device for monitoring the detonation of the squibs” (patent RU 2339103 C1, H01C 1/032, 11/20/2008) containing a power source, switching nodes consisting of two key elements, a control relay (flow control) and remote switches for each thread of the squibs, in which each switching winding bypasses the threads of the squibs, the disconnecting windings of which are combined and are inputs for resetting the individual control circuits of the status of the squib, switch ruyuschie nodes through current limiting resistors connected to the squibs pin threads. The control relay coils are connected to the process bus by one terminal, which is used only for ground tests, and the second terminal is connected to the device’s wake-up input, the monitoring relay contacts are connected in such a way that they form a series circuit for the connection of the pyro cartridges and current-limiting resistors. The method of limiting the current implemented in the device is taken as a prototype, as it is used directly for initiating devices (squibs).

The disadvantages of these technical solutions are relatively large mass and overall dimensions and insufficiently high load capacity of the resistors, which in most cases is connected with the purpose of resistors for working with various devices for a long time and ensuring reliability during long-term operation.

The problem to which the invention is directed is to implement a method for adjusting the value of the consumed current of initiating devices, providing:

- reducing the weight and overall dimensions of the current-limiting elements;

- ensuring adjustment of internal resistance in the manufacture of initiating devices;

- optimization of the layout of initiating devices;

- increased reliability;

- protection of devices and cable networks from exposure to increased current loads and supply voltage drops when triggering devices are triggered.

The task is solved by the method of adjusting the value of the consumed current of initiating devices, which consists in the fact that the switching nodes are connected to the terminals of the initiating devices through current-limiting elements, with a distinctive feature being that the current from the material with high specific resistance and heat-resistant insulation, change the electrical resistance of the wire to a predetermined value by reducing its length, and the cross-section of the wire from A material with a high resistivity is chosen so that when the initiating device is triggered, its temperature does not reach the insulation destruction temperature. Current adjustment is carried out in AC and DC circuits. Conducting wires are made of precision alloys. Heat-resistant insulation is made from a material with high electrical strength and resistivity. The wire from the material with high resistivity is connected to the elements of the electrical circuit by soldering or welding with mechanical reinforcement.

Achievable technical result is to improve the mass-dimensional characteristics of the initiating devices, providing the ability to adjust the internal resistance and current consumption without the use of electro-radio products, increase reliability and improve the manufacturability of the initiating devices.

The invention is illustrated by drawings, which do not cover and, moreover, do not limit the entire scope of the claims of this technical solution, but are only illustrative materials of a particular case of execution:

FIG. 1 shows the layout of the wire as part of the initiator;

FIG. 2 - resistance wire construction.

The method of adjusting the value of consumed current is that to limit the current, a resistance wire is used as a resistive element - a piece of wire made of electrically conductive material with high specific resistance 1 and heat-resistant insulation 2, which is part of the power cable and is able to provide high power dissipation during operation pulse modes. The resistance of the wire 1, as well as the initiating device 3 as a whole, is regulated by changing the length L of the segment of this wire between the electrical connector 4 and the initiating device 3, while the wire 5 paired with the resistance wire 1 is cut to the size corresponding to the resistance wire 1. The cross section of the wire 1 is chosen so that when the initiating device 3 is triggered, its temperature does not reach the destruction temperature of the insulation 2. The current is controlled in alternating and constant circuits current The conductive wire of the wire 1 is made of precision alloys, for example, from nichrome. Heat-resistant insulation 2 is made of a material with high electrical strength and resistivity, for example, from polyimide. The wire 1 of a material with high resistivity is connected to the elements of the electrical circuit by soldering or welding with mechanical reinforcement.

Thanks to the use of this method, adjustment of the resistance is simplified, as well as the weight of the device and the cost of its manufacture, as it does not require the use of standard high-power resistors.

Claims (5)

1. The method of adjusting the value of the consumed current of initiating devices, which consists in the fact that the switching nodes are connected to the initiating device terminals via current-limiting elements, which are different in that the current from the material of high resistivity and heat-resistant insulation is used to adjust the current, change the electrical the resistance of the wire to a predetermined value by reducing its length, and the cross section of the wire from a material with high resistivity is chosen as follows m, so that when it is activated initiating device temperature reached insulation breakdown temperature. 2. The method according to p. 1, characterized in that the adjustment of the current is carried out in AC and DC circuits. 3. The method according to p. 1, characterized in that the conductive wire wires are made of precision alloys. 4. The method according to p. 1, characterized in that the heat-resistant insulation is made of a material with high electrical strength and resistivity. 5. The method according to p. 1, characterized in that the wire from a material with high resistivity is connected to the elements of the electrical circuit by soldering or welding with mechanical reinforcement.

Images