CN205283379U - Constant current ignition drive circuit suitable for different explosion bolts - Google Patents

Abstract

The utility model discloses a constant current ignition drive circuit suitable for different explosion bolts has solved the problem that current ignition ignition back ignition bridge silk overlap joint formed dangerous short -circuit current. Delay circuit gives the out -point high level during ignition, second triode V2 switches on behind second triode V2 base current limiting resistor R4 and R6, draw a P type field effect transistor Q1 grid level low, a P type field effect transistor Q1 switches on, lithium battery supply 1's a current conveyance P type field effect transistor source electrode flows out to the drain electrode, two P type field effect transistor Q2's source electrode is exported through controlling resistor R8, the 2nd P type field effect transistor grid is exerted to voltage after divider resistance R9 and the 2nd divider resistance R10 partial pressure, at this moment, the 2nd P type field effect transistor switches on, the electric current from the 2nd P type field effect transistor source electrode flow out to the drain electrode is last flow into explosion bolt ignition bridge silk on, light the explosion bolt. On -the -spot ignition process's safety has been guaranteed in the effectual production that has restrained dangerous short -circuit current.

Description

It is applicable to the constant current ignition drive circuit of different blast bolt

Technical field

The present invention relates to a kind of electronic igniting circuit, in particular to the electronic igniting circuit of a kind of bolt that explodes.

Background technology

Blast bolt be a kind of in be provided with the bolt of cavity, at cavity built with explosive and some firebridge silk, electronic igniting circuit inputs specified striking current to some firebridge silk to ignite the explosive in cavity, make whole bolt be separated into two parts; At present, existing blast bolt portfire is that the specified striking current needed for concrete blast bolt designs, and can not be suitable for the igniting demand of different blast bolts; It is all bigger that the striking current of existing electronic ignition device designs, its power supply is lithium cell, finite capacity, the blast bolt lighted a fire is after blast, the two poles of the earth of some firebridge silk snap into and can form firing circuit short circuit in bolt metallic walls, the voltage of lithium cell power supply can be drawn rapidly low by bigger short-circuit current, can lead to battery explosion and firing accident time serious.

Summary of the invention

The present invention provides a kind of constant current ignition drive circuit being applicable to different blast bolt, solves after existing portfire can not be suitable for the igniting demand of different blast bolts and igniting and puts the technical problem that firebridge silk overlap joint forms dangerous short-circuit current.

The present invention solves above technical problem by the following technical programs:

A kind of constant current ignition drive circuit being applicable to different blast bolt, comprise lithium cell power supply, time delay circuit and the preventing jittering circuit that powers on, the output terminal of time delay circuit is connected with the collector electrode of the first triode by collector electrode current limliting resistance, the grounded emitter of the first triode, the positive pole of lithium cell power supply is connected with the positive pole of differential charging capacitor by differential charging input resistance, the negative pole of differential charging capacitor is connected with the negative pole of lithium cell power supply by differential charging output resistance, it is connected by the first transistor base current limliting resistance between the negative pole of differential charging capacitor and the base stage of the first triode, between the emtting electrode and the collector electrode of the first triode of the first triode, in parallel disappearing trembles electric capacity and leak resistance respectively, the base stage of the 2nd triode is connected with the collector electrode of the first triode by the 2nd base stage current limliting resistance, the emtting electrode of the 2nd triode is connected with lithium cell power cathode, the grid of the one P type field effect transistor is connected with the collector electrode of the 2nd triode, the source electrode of the one P type field effect transistor is connected with the positive pole of lithium cell power supply, it is parallel with off-resistances between the grid of the one P type field effect transistor and the source electrode of a P type field effect transistor, the source electrode of the 2nd P type field effect transistor is connected with the drain electrode of a P type field effect transistor by an adjustable resistance, the grid of the 2nd P type field effect transistor is connected with the drain electrode of a P type field effect transistor by point compressive resistance and adjustable resistance successively, it is connected with the 2nd point of compressive resistance between the grid and lithium cell power cathode of the 2nd P type field effect transistor, an electrical ignition element blast bolt it is connected between the drain electrode and lithium cell power cathode of the 2nd P type field effect transistor, the base stage of the 3rd triode is connected with the drain electrode of the 2nd P type field effect transistor, the emtting electrode of the 3rd triode is connected with the drain electrode of a P type field effect transistor, the collector electrode of the 3rd triode is connected with the drain electrode of the 2nd P type field effect transistor.

Time delay circuit is 555 type time delay circuits.

Circuit structure of the present invention is simple, and striking current is easy to adjust, effectively inhibits the generation of dangerous short-circuit current, ensure that the safety of on-the-spot ignition process.

Accompanying drawing explanation

Fig. 1 is the structural representation of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail:

A kind of constant current ignition drive circuit being applicable to different blast bolt, comprise lithium cell power supply 1, time delay circuit 2 and the preventing jittering circuit 3 that powers on, the output terminal of time delay circuit 2 is connected with the collector electrode of the first triode V1 by collector electrode current limliting resistance R4, the grounded emitter of the first triode V1, the positive pole of lithium cell power supply 1 is connected with the positive pole of differential charging capacitor C1 by differential charging input resistance R1, the negative pole of differential charging capacitor C1 is connected with the negative pole of lithium cell power supply 1 by differential charging output resistance R2, it is connected by the first triode V1 base stage current limliting resistance R3 between the negative pole of differential charging capacitor C1 and the base stage of the first triode V1, between the emtting electrode and the collector electrode of the first triode V1 of the first triode V1, in parallel disappearing trembles electric capacity C2 and leak resistance R5 respectively, the base stage of the 2nd triode V2 is connected with the collector electrode of the first triode V1 by the 2nd base stage current limliting resistance R6, the emtting electrode of the 2nd triode V2 is connected with lithium cell power supply 1 negative pole, the grid of the one P type field effect transistor Q1 is connected with the collector electrode of the 2nd triode V2, the source electrode of the one P type field effect transistor Q1 is connected with the positive pole of lithium cell power supply 1, it is parallel with off-resistances R7 between the grid of the one P type field effect transistor Q1 and the source electrode of a P type field effect transistor Q1, the source electrode of the 2nd P type field effect transistor Q2 is connected with the drain electrode of a P type field effect transistor Q1 by an adjustable resistance R8, the grid of the 2nd P type field effect transistor Q2 is connected with the drain electrode of a P type field effect transistor Q1 by a point compressive resistance R9 and adjustable resistance R8 successively, it is connected with the 2nd point of compressive resistance R10 between the grid and lithium cell power supply 1 negative pole of the 2nd P type field effect transistor Q2, an electrical ignition element blast bolt Z1 it is connected between the drain electrode and lithium cell power supply 1 negative pole of the 2nd P type field effect transistor Q2, the base stage of the 3rd triode V3 is connected with the drain electrode of the 2nd P type field effect transistor Q2, the emtting electrode of the 3rd triode V3 is connected with the drain electrode of a P type field effect transistor Q1, the collector electrode of the 3rd triode V3 is connected with the drain electrode of the 2nd P type field effect transistor Q2.

Time delay circuit 2 is 555 type time delay circuits.

During igniting, time delay circuit provides a high level, the 2nd triode V2 conducting after the 2nd triode V2 base stage current limliting resistance R4 and R6, one P type field effect transistor Q1 grid level is drawn low, one P type field effect transistor Q1 conducting, the electric current of lithium cell power supply 1 flows out to drain electrode by a P type field effect transistor Q1 source electrode, the source electrode of the 2nd P type field effect transistor Q2 is outputted to by adjustable resistance R8, the voltage after compressive resistance R9 and the 2nd point of compressive resistance R10 dividing potential drop is divided to be applied to the 2nd P type field effect transistor Q2 grid, at this moment the 2nd P type field effect transistor Q2 conducting, electric current flows out to drain electrode from the 2nd P type field effect transistor Q2 source electrode and is finally flowed into blast bolt point firebridge silk, light blast bolt, when the voltage at adjustable resistance R8 two ends is greater than the 3rd triode V3 cut-in voltage (0.7 volt), 3rd triode V3 conducting, at this moment, 3rd triode V3 collector voltage is lithium cell power supply 1 voltage, 2nd P type field effect transistor Q2 ends, completed the feedback of striking current by the 3rd triode V3, make igniting constant output current to set(ting)value, when a different blast bolt striking current demand is different by regulating the size of adjustable resistance R8 resistance to change outward current, calculation formula is: I=0.7/R8(unit ampere).

When the bolt point firebridge silk overlap joint that explodes after lighting a fire is short-circuit, when the voltage at adjustable resistance R8 two ends is greater than the 3rd triode V3 cut-in voltage (0.7 volt), 2nd P type field effect transistor Q2 grid voltage is drawn high by the 3rd triode V3 conducting, thus the 2nd P type field effect transistor Q2 is ended, the feedback of striking current is completed by the 3rd triode V3, make igniting outward current remain on setting electric current, dangerous short-circuit current can not be formed because of blast bolt point firebridge silk short circuit.

Claims (2)

1. one kind is applicable to the constant current ignition drive circuit of different blast bolt, comprise lithium cell power supply (1), time delay circuit (2) and the preventing jittering circuit that powers on (3), it is characterized in that, the output terminal of time delay circuit (2) is connected with the collector electrode of the first triode (V1) by collector electrode current limliting resistance (R4), the grounded emitter of the first triode (V1), the positive pole of lithium cell power supply (1) is connected with the positive pole of differential charging capacitor (C1) by the differential input resistance (R1) that charges, the negative pole of differential charging capacitor (C1) is connected with the negative pole of lithium cell power supply (1) by the differential output resistance (R2) that charges, it is connected by the first triode (V1) base stage current limliting resistance (R3) between the negative pole of differential charging capacitor (C1) and the base stage of the first triode (V1), between the emtting electrode and the collector electrode of the first triode (V1) of the first triode (V1), in parallel disappearing trembles electric capacity (C2) and leak resistance (R5) respectively, the base stage of the 2nd triode (V2) is connected with the collector electrode of the first triode (V1) by the 2nd base stage current limliting resistance (R6), the emtting electrode of the 2nd triode (V2) is connected with the negative pole of lithium cell power supply (1), the grid of the one P type field effect transistor (Q1) is connected with the collector electrode of the 2nd triode (V2), the source electrode of the one P type field effect transistor (Q1) is connected with the positive pole of lithium cell power supply (1), it is parallel with off-resistances (R7) between the grid of the one P type field effect transistor (Q1) and the source electrode of P type field effect transistor (Q1), the source electrode of the 2nd P type field effect transistor (Q2) is connected with the drain electrode of P type field effect transistor (Q1) by an adjustable resistance (R8), the grid of the 2nd P type field effect transistor (Q2) is connected with the drain electrode of P type field effect transistor (Q1) by point compressive resistance (R9) and adjustable resistance (R8) successively, it is connected with the 2nd point of compressive resistance (R10) between the grid and the negative pole of lithium cell power supply (1) of the 2nd P type field effect transistor (Q2), an electrical ignition element blast bolt (Z1) it is connected between the drain electrode and the negative pole of lithium cell power supply (1) of the 2nd P type field effect transistor (Q2), the base stage of the 3rd triode (V3) is connected with the drain electrode of the 2nd P type field effect transistor (Q2), the emtting electrode of the 3rd triode (V3) is connected with the drain electrode of P type field effect transistor (Q1), the collector electrode of the 3rd triode (V3) is connected with the drain electrode of the 2nd P type field effect transistor (Q2).

2. a kind of constant current ignition drive circuit being applicable to different blast bolt according to claim 1, it is characterised in that, time delay circuit (2) is 555 type time delay circuits.