Adaptive arc fault detection and smart fusing system

• US 6,525,918 B1
• Filed: 09/11/2001
• Issued: 02/25/2003
• Est. Priority Date: 09/11/2001
• Status: Expired due to Fees

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Alles, Sheran Anthony, Zarei, Shahram, Diez, Timothy Patrick
• Primary Examiner(s): HUYNH, KIM NGOC
• Application Number:
  US09/682,507
• Time in Patent Office: 532 Days
• Field of Search: 361/78, 361/79, 361/93.1, 361/93.2, 361/93.9, 361/7, 361/87, 340/511, 340/517, 340/522, 307/4.1, 307/10.1
• US Class Current: 361/93.1
• CPC Class Codes: H02H 1/0015 Using arc detectors
• CPC Class Codes: H02H 1/04 Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks

Abstract

An adaptive fusing electrical circuit (circuit) including a power supply and an electrical load drawing an electrical current therethrough. The circuit includes a current detector that measures a current level through the circuit. An interruption switch, which is normally closed, is electrically coupled to the electrical load and the current detector having an open state and a closed state. A controller is coupled to the power supply, the current detector, and the switch, the controller monitors the current level and a first circuit parameter of the electrical circuit. The controller interrupts the electrical current by switching the interruption switch from the closed state to the open state when the current level and the first circuit parameter are outside corresponding guard bands.

Claims

1. An adaptive fusing electrical circuit including a power supply and an electrical load comprising:

a current detector measuring a current level through the electrical circuit;

an interruption switch electrically coupled to the electrical load and said current detector having an open state and a closed state, said interruption switch normally closed; and

a controller electrically coupled to the power supply, said current detector, and said switch, said controller monitoring said current level and a first circuit parameter of the electrical circuit;

said controller having a first guard band corresponding to said current level and a second guard band corresponding to said first circuit parameter, wherein said controller comparing said current level to said first guard band and said first circuit parameter to said second guard band and switching said interruption switch from said closed state to said open state when said current level is outside said first guard band and said first circuit parameter is outside said second guard band.

2. A circuit as in claim 1 further comprising an adaptive fusing apparatus comprising said controller and said interruption switch.

3. A circuit as in claim 2 wherein said adaptive fusing apparatus measures, monitors, and interrupts resistive shorts in the adaptive fusing electrical circuit.

4. A circuit as in claim 2 wherein said adaptive fusing apparatus measures, monitors, and interrupts current to an inductive load in the adaptive fusing electrical circuit.

5. A circuit as in claim 2 wherein said adaptive fusing apparatus further comprises said current detector.

6. A circuit as in claim 1 wherein said parameter is selected from a group comprising:

duration of current amplitude, frequency, time, temperature, voltage, power, inductance, and resistance.

7. A circuit as in claim 1 wherein said controller further comprises a memory device storing said first guard band and said second guard band.

8. A circuit as in claim 7 wherein said memory device further stores signal curve characteristics corresponding to a electronic device and said controller controlling said interruption switch to switch from said closed state to said open state when said signal curve characteristics are outside a predetermined signal curve guard band.

9. A circuit as in claim 8 wherein said controller creates a guard band in response to a set of measured parameters and electronic device characteristics.

10. A circuit as in claim 1 wherein said controller measures a large current surge caused by a short to ground and controls said interruption switch to switch from said closed state to said open state directly upon measuring said large current surge.

11. An adaptive fusing electrical circuit including a power supply and first electrical load and a second electrical load comprising:

a first current detector measuring a first current level through the electrical circuit;

a second current detector measuring a second current level through the electrical circuit;

a first interruption switch electrically coupled to the first electrical load and said first current detector having an open state and a closed state;

a second interruption switch electrically coupled to the second electrical load and said second current detector having an open state and a closed state; and

a controller electrically coupled to the power supply, said first current detector, said second current detector, and said switch, said controller monitoring a first current level, a second current level, a first circuit parameter, and a second current parameter of the electrical circuit;

said controller having a first guard band corresponding to said first current level, a second guard band corresponding to said second current level, a third guard band corresponding to said first circuit parameter, and a forth guard band corresponding to said second circuit parameter;

said controller comparing said first current level to said first guard band and said first circuit parameter to said third guard band switching said first interruption switch from said closed state to said open state when said first current level is outside said first guard band and said third circuit parameter is outside said second guard band;

said controller comparing said second current level to said second guard band and said second circuit parameter to said forth guard band switching said second interruption switch from said closed state to said open state when said second current level is outside said second guard band and said second circuit parameter is outside said forth guard band.

12. A circuit as in claim 11 further comprising an adaptive fusing apparatus comprising said first interruption device and said second interruption device.

13. A circuit as in claim 11 further comprising an adaptive fusing apparatus comprising said first current detector and said second current detector.

14. A method of adaptive fusing for an electrical circuit having an electrical load drawing an electrical current therethrough comprising:

measuring a current level and a circuit parameter;

comparing said current level with a first guard band and said circuit parameter with a second guard band; and

interrupting said electrical current when said current level is outside said first guard band and said circuit parameter is outside said second guard band.

15. A method as in claim 14 further comprising:

analyzing frequency information of said electrical current;

interrupting said electrical current when said frequency information is outside a predetermined frequency response range and said current level is outside said first guard band.

16. A method as in claim 14 further comprising:

learning normal operating characteristics of an electronic device; and

creating a guard band in response to those characteristics.

17. A method as in claim 16 wherein learning normal operating characteristics includes characteristics selected from the following group comprising:

load profile, operating current levels, operating voltage levels, operating power levels, operating temperature levels, current decay rates.

18. A method as in claim 17 wherein interrupting said electrical current when said operating characteristics are outside corresponding guard bands determined for those operating characteristics.

19. A method as in claim 14 wherein measuring a circuit parameter comprises measuring a parameter selected from the following group comprising:

duration of current amplitude, frequency, time, temperature, voltage, power, inductance, and resistance.