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Low-voltage-insensitive electro-pyrotechnic device

a low-voltage insensitive, electro-pyrotechnic technology, applied in the direction of instruments, lighting and heating apparatus, geological measurements, etc., can solve the problems of electric detonators susceptible to low-voltage sources such as watch batteries, inadvertent firing of detonators,

Inactive Publication Date: 2011-01-06
AUSTIN STAR DETONATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]A low-voltage-insensitive electro-pyrotechnic device according to an embodiment of the present invention comprises electrical input terminals, a bridge element connected to the electrical input terminals, and a transient voltage suppressor (“TVS”) connected between the bridge element and

Problems solved by technology

The hotwire initiator is directly electrically exposed to external electrical input or stimulus from the legwires to the outside world, making it susceptible to stray electrical voltage or current entering the legwires, leading to possible inadvertent firing of the detonator.
Such electric detonators are likewise vulnerable to ESD strikes (either wire-to-wire or wire-to-shell), which can also lead to inadvertent firing.
This makes electric detonators susceptible to low voltage sources such as watch batteries, etc.

Method used

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Examples

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Embodiment Construction

[0010]FIGS. 1-3 depict a low-voltage-insensitive electro-pyrotechnic device according to a preferred embodiment of the present invention in which there is a single bidirectional TVS and a parallel resistor. As seen in FIGS. 1 and 3, a hotwire initiator 20 is secured in the detonator 10 with an endplug 15, with a TVS 22 placed before the hotwire initiator 20 and a parallel resistor 24 placed before the TVS 22 and between the two input terminals 26 from the legwires 28. FIG. 2 shows an example of a circuit board layout (with the positions where the TVS 22 and resistor 24 sit on the board depicted in dashed lines) using a 5.0 mm×13.3 mm board 13 that can be accommodated inside the metal shell 30 of a common mining and blasting detonator as shown in FIG. 1, with contact pads 21 provided for connection to the hotwire initiator 20.

[0011]The TVS 22 blocks voltage applied across the legwires 28 until the clamping voltage is reached, at which point the TVS 22 starts conducting current to the...

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PUM

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Abstract

A low-voltage-insensitive electro-pyrotechnic device comprising electrical input terminals, a bridge element connected to the electrical input terminals, and a transient voltage suppressor connected between the bridge element and one of the electrical input terminals. The device may utilize one bidirectional TVS on one side of the bridge element or two unidirectional TVSs on opposite sides of the bridge element, and may also include one or more resistors and / or an RF filter between the input terminals and bridge element.

Description

FIELD OF THE INVENTION[0001]The present invention relates primarily to the field of electro-pyrotechnic devices, and more particularly, to a low-voltage-insensitive electro-pyrotechnic device.BACKGROUND OF THE INVENTION[0002]Conventional electric detonators comprise hotwire initiators inserted into a metal shell with load charges. The hotwire initiator is directly electrically exposed to external electrical input or stimulus from the legwires to the outside world, making it susceptible to stray electrical voltage or current entering the legwires, leading to possible inadvertent firing of the detonator. Such electric detonators are likewise vulnerable to ESD strikes (either wire-to-wire or wire-to-shell), which can also lead to inadvertent firing. Since hotwire resistance is typically in the range of 1 to 5 Ohm, significant current will flow through the hotwire at voltages of 1 to 5V without ESD protection. This makes electric detonators susceptible to low voltage sources such as wat...

Claims

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Application Information

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IPC IPC(8): F23Q13/00
CPCF42B3/18
Inventor LANSBURG, DAVID F.TEOWEE, GIMTONG
Owner AUSTIN STAR DETONATOR