Voltage regulator with improved protection and warning system

• US 7,397,224 B2
• Filed: 08/20/2007
• Issued: 07/08/2008
• Est. Priority Date: 06/22/2005
• Status: Active Grant

• Current Assignee: C E Niehoff & Company
• Original Assignee: C E Niehoff & Company
• Inventors: Jabaji, Issam
• Primary Examiner(s): Schuberg; Darren
• Assistant Examiner(s): Mohandesi; Iraj A
• Application Number:
  US11/894,285
• Publication Number:
  US 20080012537A1
• Time in Patent Office: 323 Days
• Field of Search: 322/28, 322/11, 322/17, 322/23, 322/24, 322/27, 322/33, 322/34
• US Class Current: 322/28
• CPC Class Codes: H02H 7/06 for dynamo-electric generators; for synchronous capacitors
• CPC Class Codes: H02P 9/30 using semiconductor devices

Abstract

This invention discloses a vehicle electrical system voltage regulator with improved electrical protection and warning means that discerns and responds to regulator, generator, or vehicle electrical system operation and malfunctions. The regulator includes monitoring, control, and protection circuits with a phase signal monitor, a field switching circuit that operates the field coil in response to electrical power demands, and a field enable switch in series with the field regulating switch. The phase monitor and protection circuit ascertains and transmits generator rotational motion for use by the monitoring and control circuit in discerning the various operating conditions. The monitoring and control circuit operates on the field switching circuit to meet the electrical power demands and provide multi level fault protection to include field switching circuit reconfiguration to continue operating under various fault conditions. A warning and diagnostic system incorporating visual indicators and communication lines provide descriptive system information for use by the vehicle'"'"'s operator and computer network, respectively.

Claims

1. A voltage regulator for a generator in a vehicle, said generator comprising a field coil, said voltage regulator comprising:

(a) a field enable switch;

(b) a field regulating switch responsive to said field enable switch and operative to switch on/off said field coil; and

(c) a processor, including a programming code operable on the processor, coupled with an output of said generator and said field enable and field regulating switches;

wherein said processor is configured to ascertain one or more operating states of said generator and voltage regulator by monitoring the output of said generator and a switching interval of said field regulating switch, and wherein the processor is configured to activate/deactivate said field enable switch in response to said one or more operating states.

2. The voltage regulator of claim 1, wherein said processor is configured to activate said field enable switch when said one or more operating states of said generator and voltage regulator correspond to a properly operating state of said generator and a properly operating state of said voltage regulator, and to deactivate said field enable switch when said one or more operating states of said generator and voltage regulator correspond to an improperly operating state of said generator or an improperly operating state of said voltage regulator.

3. The voltage regulator of claim 1, wherein said processor is further configured to switch on/off said field enable switch when said field regulating switch fails to switch on/off said field coil at least once within a pre-determined time interval.

10. The voltage regulator of claim 1, further comprising means for communicating said one or more operating states of said generator and voltage regulator.

11. The voltage regulator of claim 1, wherein said one or more operating states of said generator comprises at least one of a properly operating state and an improperly operating state, wherein a properly operating state of said generator corresponding to said generator output voltage residing within a pre-determined output voltage range, and an improperly operating state of said generator corresponding to said generator output voltage residing outside of said pre-determined output voltage range.

12. The voltage regulator of claim 1, wherein said one or more operating states of said voltage regulator comprises at least one of a properly operating state and an improperly operating state, wherein a properly operating state of said voltage regulator corresponding to said field regulating switch switching on/off said field coil at least once within a pre-determined time interval, and an improperly operating state of said voltage regulator corresponding to said field regulating switch failing to switch on/off said field coil at least once within said pre-determined time interval.

13. The voltage regulator of claim 2, wherein said processor is further configured to re-activate said field enable switch when a voltage of a battery coupled with the generator falls below a pre-determined value.

14. The voltage regulator of claim 1, wherein said generator further comprises a rotary shaft coupled with an engine of said vehicle.

15. The voltage regulator of claim 14, further comprising a first terminal carrying a first signal proportional to a rotational speed of said shaft.

16. The voltage regulator of claim 15, wherein said processor is configured to monitor said first signal and to deactivate said field enable switch when said first signal is absent.

17. The voltage regulator of claim 14, further comprising a second terminal carrying a second signal proportional to an on/off state of said engine.

18. The voltage regulator of claim 17, wherein said processor is configured to monitor said second signal and to deactivate said field enable switch when said second signal is absent.

4. A voltage regulator for a generator in a vehicle, said generator comprising a field coil, said voltage regulator comprising:

(a) a field enable switch;

(b) a first field regulating switch responsive to said field enable switch and operative to switch on/off said field coil;

(c) a second field regulating switch responsive to said field enable switch and operative to switch on/off said field coil; and

(d) a processor, including a programming code operable on the processor, coupled with an output of said generator and said field enable, first field regulating, and second field regulating switches;

wherein said processor is configured to ascertain one or more operating states of said generator and voltage regulator by monitoring the output of said generator and a switching interval of said first and second field regulating switches, and wherein the processor is configured to activate/deactivate said field enable switches in response to said one or more operating states.

5. The voltage regulator of claim 4, wherein said processor is configured to activate said field enable switch when said one or more operating states of said generator and voltage regulator correspond to a properly operating state of said generator and a properly operating state of said voltage regulator, and to deactivate said field enable switch when said one or more operating states of said generator and voltage regulator correspond to an improperly operating state of said generator or an improperly operating state of said voltage regulator.

19. The voltage regulator of claim 4, wherein said one or more operating states of said generator comprises at least one of a properly operating state and an improperly operating state, wherein a properly operating state of said generator corresponding to said generator output voltage residing within a pre-determined output voltage range, and an improperly operating state of said generator corresponding to said generator output voltage residing outside of said pre-determined output voltage range.

20. The voltage regulator of claim 4, wherein said one or more operating states of said voltage regulator comprises at least one of a properly operating state and an improperly operating state, wherein a properly operating state of said voltage regulator corresponding to said field regulating switch switching on/off said field coil at least once within a pre-determined time interval, and an improperly operating state of said voltage regulator corresponding to said field regulating switch failing to switch on/off said field coil at least once within said pre-determined time interval.

6. A voltage regulator for a generator in a vehicle, said generator comprising a field coil, said voltage regulator comprising:

(a) a first field enable switch;

(b) a first field regulating switch responsive to said first field enable switch and operative to switch on/off said field coil;

(c) a second field enable switch;

(d) a second field regulating switch responsive to said second field enable switch and operative to switch on/off said field coil; and

(e) a processor, including a programming code operable on the processor, coupled with an output of said generator and said first field enable, second field enable, first field regulating, and second field regulating switches;

wherein said processor is configured to ascertain one or more operating states of said generator and voltage regulator by monitoring the output of said generator and a switching interval of said first and second field regulating switches, and wherein the processor is configured to activate/deactivate said first and second field enable switches in response to said one or more operating states.

7. The voltage regulator of claim 6, wherein said one or more operating states of said voltage regulator comprises at least one of a properly operating state and an improperly operating state, wherein a properly operating state of said voltage regulator corresponding to said first or second field regulating switches switching on/off said field coil at least once within a pre-determined time interval, and an improperly operating state of said voltage regulator corresponding to said first and second field regulating switches failing to switch on/off said field coil at least once within said pre-determined time interval.

8. The voltage regulator of claim 6, wherein said processor is configured to activate said first and second field enable switches when said one or more operating states of said generator and voltage regulator correspond to a properly operating state of said generator and a properly operating state of said voltage regulator, and to deactivate said first and second field enable switches when said one or more operating states of said generator and voltage regulator correspond to an improperly operating state of said generator or an improperly operating state of said voltage regulator.

21. The voltage regulator of claim 6, wherein said one or more operating states of said generator comprises at least one of a properly operating state and an improperly operating state, wherein a properly operating state of said generator corresponding to said generator output voltage residing within a pre-determined output voltage range, and an improperly operating state of said generator corresponding to said generator output voltage residing outside of said pre-determined output voltage range.

9. A voltage regulator for a generator in a vehicle, said generator comprising a field coil, said voltage regulator comprising:

(a) a field enable switch;

(b) a field regulating switch responsive to said field enable switch and operative to switch on/off said field coil; and

(c) a processor, including a programming code operable on the processor, coupled with said field enable and field regulating switches;

wherein said processor is configured to monitor a switching interval of said field regulating switch, and to reconfigure the field enable switch to switch on/off said field coil when the field regulating switch fails to switch on/off said field coil at least once within a pre-determined time interval.