Systems and methods for calibrating a conducted electrical weapon

Patent metadata

Field	Value
Publication number	US-10451387-B2
Application number	US-201615299286-A
Country	US
Kind code	B2
Filing date	Oct 20, 2016
Priority date	Aug 24, 2016
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

Systems and methods for calibrating a conducted electrical weapon (“CEW”) to provide a predetermined amount of current for each pulse of the stimulus signal. Providing the predetermined amount of current, close thereto, increases the effectiveness of the stimulus signal in impeding locomotion of a human or animal target. The calibration process enables a CEW to calibrate the amount of charge in a pulse of the stimulus signal in the environmental conditions where the tester operates and also in the field where the environmental conditions may be different from the environmental conditions during calibration.

First claim

What is claimed is:

1. A handle of a conducted electrical weapon (“CEW”) that cooperates with a provided tester for calibrating a stimulus signal of the handle, the stimulus signal for impeding locomotion of a human or animal target, the handle comprising:
a processing circuit;
a first capacitance;
a second capacitance; wherein the processing circuit executes a stored program to:
charge the first capacitance to a target voltage;
discharge the second capacitance;
discharge the first capacitance to provide a pulse of the stimulus signal to the tester, provision of the pulse to the tester charges the second capacitance;
receive a message regarding an amount of charge provided by the pulse, the amount of charge measured by the tester;
compare the amount of charge to a predetermined amount of charge;
adjust the target voltage responsive to the comparison;
repeat charging the first capacitance, discharging the second capacitance, discharging the first capacitance, receiving the message, comparing the amount of charge, and adjusting the target voltage until the amount of charge measured by the tester is about the same as the predetermined amount of charge; and
record a magnitude of a voltage across the second capacitance as indicia that the amount of the charge provided by the pulse is about the same as the predetermined amount.

2. The handle of claim 1 wherein the magnitude of the voltage across the second capacitance is measured after the processing circuit compares the amount of charge to the predetermined amount of charge and prior to discharging the second capacitance.

3. The handle of claim 1 wherein the amount of charge is about the same as the predetermined amount of charge when the amount of charge is the predetermined amount of charge plus or minus three microcoulombs.

4. The handle of claim 1 wherein the amount of charge is about the same as the predetermined amount of charge when the amount of charge is the predetermined amount of charge plus or minus five percent of the predetermined amount of charge.

5. The handle of claim 1 wherein the amount of charge is related to the target voltage.

6. A handle of a conducted electrical weapon (“CEW”) that cooperates with a provided tester for calibrating a stimulus signal of the handle, the stimulus signal for impeding locomotion of a human or animal target, the handle comprising:
a processing circuit;
a first capacitance;
a second capacitance; wherein the processing circuit executes a stored program to:
charge the first capacitance to a target voltage;
discharge the second capacitance;
discharge the first capacitance to provide a pulse of the stimulus signal to the tester, provision of the pulse to the tester charges the second capacitance;
receive a message regarding an amount of charge provided by the pulse, the amount of charge measured by the tester;
determine that the amount of charge measured by the tester is about the same as a predetermined amount of charge; and
record a magnitude of a voltage across the second capacitance as indicia that the amount of the charge provided by the pulse is about equal to the predetermined amount.

7. The handle of claim 6 wherein the amount of charge is about the same as the predetermined amount of charge when the amount of charge is the predetermined amount of charge plus or minus three microcoulombs.

8. The handle of claim 6 wherein the amount of charge is about the same as the predetermined amount of charge when the amount of charge is the predetermined amount of charge plus or minus five percent of the predetermined amount of charge.

9. The handle of claim 6 wherein the amount of charge is related to the target voltage.

10. The handle of claim 6 wherein the processing circuit includes a microprocessor and one or more switches, the microprocessor controls the one or more switches to charge and discharge the first and second capacitances.

11. The handle of claim 6 wherein the processing circuit includes a communication circuit that receives the message.

12. A method performed by a handle of a conducted electrical weapon (“CEW”) for calibrating a stimulus signal of the handle, the stimulus signal for impeding locomotion of a human or animal target, the method comprising:
charging a first capacitance to a target voltage;
discharging a second capacitance;
discharging the first capacitance to provide a pulse of the stimulus signal to a tester, providing the pulse charges the second capacitance;
receiving a message from the tester regarding an amount of charge provided by the pulse of current to the tester, the amount of charge measured by the tester;
comparing the amount of charge to a predetermined amount of charge;
adjusting the target voltage responsive to the comparison;
repeating charging the first capacitance, discharging the second capacitance, discharging the first capacitance, receiving the message, comparing the amount of charge, and adjusting the target voltage until the amount of charge measured by the tester is about the same as the predetermined amount of charge; and
recording a magnitude of a voltage across the second capacitance as indicia that the amount of the charge provided by the pulse is about the same as the predetermined amount.

13. The method of claim 12 wherein discharging the second capacitance comprises discharging the second capacitance so that a magnitude of the voltage across the second capacitance is about zero.

14. The method of claim 12 wherein the amount of charge is about the same as the predetermined amount of charge when the amount of charge is the predetermined amount of charge plus or minus three microcoulombs.

15. The method of claim 12 wherein the amount of charge is about the same as the predetermined amount of charge when the amount of charge is the predetermined amount of charge plus or minus five percent of the predetermined amount of charge.

16. The method of claim 12 wherein adjusting comprises:
increasing the target voltage when the amount of charge is less than the predetermined amount of charge; and

decreasing the target voltage when the amount of charge is greater than the predetermined amount of charge.

Assignees

• Axon Entpr Inc

Inventors

• Nerheim Magne H
• Barber-Axthelm Valerie Renee Barry
• Goodchild Eric Heindel
• Heroor Siddharth

Classifications

• F41H13/0012 Primary

  Electrical discharge weapons, e.g. for stunning · CPC title

• G01R15/165

  measuring electrostatic potential, e.g. with electrostatic voltmeters or electrometers, when the design of the sensor is essential (electrometers with passively moving electrodes G01R5/28; measuring electrostatic fields G01R29/12; measuring charge G01R29/24; measuring in circuits with high internal resistance G01R19/0023) · CPC title

• F41H13/0025

  for remote electrical discharge via conducting wires, e.g. via wire-tethered electrodes shot at a target · CPC title

• G01R15/16

  using capacitive devices · CPC title

• G01R31/3191

  Calibration · CPC title