Integrator and firing circuit for proximity fuzes

• US 4,939,995 A
• Filed: 11/11/1974
• Issued: 07/10/1990
• Est. Priority Date: 11/11/1974
• Status: Expired due to Term

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Feinberg, Arthur R.
• Primary Examiner(s): Jordan, Charles T.
• Assistant Examiner(s): Johnson, Stephen
• Application Number:
  US05/523,785
• Time in Patent Office: 5,720 Days
• Field of Search: 102/70.2 R, 102/70.2 P, 102/213, 102/214, 343/7 PF, 307/283-285, 307/293, 307/294, 307/301, 307/597-599, 307/107-108
• US Class Current: 102/214
• CPC Class Codes: F42C 13/04 operated by radio waves

Abstract

A projectile proximity fuze firing circuit which is compatible with the rirements of both a negative supply voltage and a grounded electronic detonator. In addition, a simple and novel transistor full wave rectifier and integrator is disclosed.

Claims

1. An integrator firing circuit for use with a fuze for firing a grounded squib of an explosive weapon comprising:

a transistor biased to transform a negatively biased varying electrical signal to a fullwave rectified negatively biased signal at its collector lead;

means for integrating said fullwave rectified signal;

first switching means connected to said means for integrating for producing a first pulse upon detection of a signal from said means for integrating which exceeds a predetermined threshold level and,

capacitive discharge means connected to said first switching means for producing a second pulse to ignite said grounded squib or said explosive weapon.

2. The integrator firing circuit of claim 1 wherein said capacitive discharge means comprises:

a SCR having a grounded anode, a gate connected to said first switching means and a cathode;

a first charging resistor having first and second leads wherein said first lead is grounded;

a firing capacitor connected between said second lead of said first charging resistor and said cathode of said SCR;

a second charging resistor connected between said cathode of said SCR and a negative voltage supply.

3. The integrator firing circuit of claim 1 wherein said first switching means comprises a programmable unijunction transistor.

4. The integrator firing circuit of claim 2 wherein said first switching means comprises a programmable unijunction transistor.