Cell site power generation

• US 9,386,518 B2
• Filed: 04/11/2014
• Issued: 07/05/2016
• Est. Priority Date: 07/10/2008
• Status: Active Grant

• Current Assignee: T-Mobile USA, Inc. (Deutsche Telekom AG)
• Original Assignee: T-Mobile USA, Inc. (Deutsche Telekom AG)
• Inventors: Fischer, Steve
• Primary Examiner(s): Fleming, Fritz M
• Application Number:
  US14/251,539
• Publication Number:
  US 20140220957A1
• Time in Patent Office: 816 Days
• Field of Search: 307 64- 66, 363/69, 320/123
• US Class Current: 1/1
• CPC Class Codes: H02J 1/10 Parallel operation of dc sources
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: H02J 9/066 characterised by the use of dynamo-electric machines H02J9/08 takes precedence
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system, apparatus, method, and manufacture for generating backup power in a wireless communications system such as a wireless communications service base station. The system includes a communications interface, a primary power interface, a generator, rectifiers, and a battery circuit. During normal operation, the communications interface is powered from the primary power interface. During a power outage, the communications interface is powered from either the generator or the battery circuit. The generator is cycled on and off during power outages to charge the battery circuit while conserving fuel. To decrease rectification loss, rectifiers are run near full load while rectifying the generator output.

Claims

1. A method of providing generated power to a wireless communications cell site having a transceiver and associated telecommunications components, the method comprising:

receiving power from a primary power source to power the wireless communications cell site;

while receiving power from the primary power source, employing a first number of rectifiers to rectify the power received from the primary power source,

wherein each of the first number of rectifiers is coupled in parallel between the primary power source and at least one output terminal to supply power to the telecommunications components of the wireless communications cell site;

determining an availability status of the primary power source;

selectively enabling and disabling a generator to generate power based, at least in part, on the availability status; and

while employing the generator to generate power, employing a second number of rectifiers to rectify the generated power,

wherein the second number is less than the first number, and

wherein each of the second number of rectifiers is coupled in parallel between the generator and the output terminal to supply power to the telecommunications components of the wireless communications cell site.

2. The method of claim 1, further comprising:

routing at least power from the primary power source, generated power, or stored power to a communications interface.

3. The method of claim 1, further comprising:

employing a battery circuit to store generated power;

sensing a voltage of the battery circuit;

determining a rate of change of the voltage; and

determining a failure condition of the battery circuit based, at least in part, on the rate of change of the voltage.

4. The method of claim 1, further comprising:

employing a battery circuit to store generated power;

sensing a voltage of the battery circuit;

if the sensed voltage represents that the battery circuit has less than approximately a 20 percent charge, enabling the generator; and

if the sensed voltage of the battery circuit represents that the battery circuit has more than approximately an 82 percent charge, disabling the generator.

5. The method of claim 1, further comprising:

receiving an operational status of a back-haul that is coupled to a communications interface; and

selectively employing the generator based, at least in part, on the received operational status of the back-haul.

6. A wireless communications cell site comprising:

a transceiver;

a processor; and

a non-volatile memory having instructions that when executed by the processor cause the transceiver and associated telecommunications components of the wireless communications cell cite to;

receive power from a primary power source to power the wireless communications cell site;

while receiving power from the primary power source, employ a first number of rectifiers to rectify the power received from the primary power source,

wherein each of the first number of rectifiers is coupled in parallel between the primary power source and at least one output terminal to supply power to the telecommunications components of the wireless communications cell site;

determine an availability status of the primary power source;

selectively enable and disable a generator to generate power based, at least in part, on the availability status; and

while employing the generator to generate power, employ a second number of rectifiers to rectify the generated power,

wherein the second number is less than the first number, and

wherein each of the second number of rectifiers is coupled in parallel between the generator and the output terminal to supply power to the telecommunications components of the wireless communications cell site.

7. The wireless communications cell site of claim 6, wherein the instructions when executed by the processor further cause the wireless communications cell cite to:

route at least power from the primary power source, generated power, or stored power to a communications interface.

8. The wireless communications cell site of claim 6, wherein the instructions when executed by the processor further cause the wireless communications cell cite to:

employ a battery circuit to store generated power;

sense a voltage of the battery circuit;

determine a rate of change of the voltage; and

determine a failure condition of the battery circuit based, at least in part, on the rate of change of the voltage.

9. The wireless communications cell site of claim 6, wherein the instructions when executed by the processor further cause the wireless communications cell cite to:

employ a battery circuit to store generated power;

sense a voltage of the battery circuit;

if the sensed voltage represents that the battery circuit has less than approximately a 20 percent charge, enable the generator; and

if the sensed voltage of the battery circuit represents that the battery circuit has more than approximately an 82 percent charge, disable the generator.

10. The wireless communications cell site of claim 6, wherein the instructions when executed by the processor further cause the wireless communications cell cite to:

receive an operational status of a back-haul that is coupled to a communications interface; and

selectively employ the generator based, at least in part, on the received operational status of the back-haul.

11. A non-transitory computer-readable medium having stored thereon instructions that when executed by a processor cause a wireless communications cell site having a transceiver and associated telecommunications components to:

receive power from a primary power source to power the wireless communications cell site;

while receiving power from the primary power source, employ a first number of rectifiers to rectify the power received from the primary power source,

wherein each of the first number of rectifiers is coupled in parallel between the primary power source and at least one output terminal to supply power to the telecommunications components of the wireless communications cell site;

determine an availability status of the primary power source;

selectively enable and disable a generator to generate power based, at least in part, on the availability status; and

while employing the generator to generate power, employ a second number of rectifiers to rectify the generated power,

wherein the second number is less than the first number, and

wherein each of the second number of rectifiers is coupled in parallel between the generator and the output terminal to supply power to the telecommunications components of the wireless communications cell site.

12. The non-transitory computer-readable medium of claim 11, wherein the instructions when executed additionally cause the wireless communications cell site to:

route at least power from the primary power source, generated power, or stored power to a communications interface.

13. The non-transitory computer-readable medium of claim 11, wherein the instructions when executed additionally cause the wireless communications cell site to:

employ a battery circuit to store generated power;

sense a voltage of the battery circuit;

determine a rate of change of the voltage; and

determine a failure condition of the battery circuit based, at least in part, on the rate of change of the voltage.

14. The non-transitory computer-readable medium of claim 11, wherein the instructions when executed additionally cause the wireless communications cell site to:

employ a battery circuit to store generated power;

sense a voltage of the battery circuit;

if the sensed voltage represents that the battery circuit has less than approximately a 20 percent charge, enabling the generator; and

if the sensed voltage of the battery circuit represents that the battery circuit has more than approximately an 82 percent charge, disabling the generator.

15. The non-transitory computer-readable medium of claim 11, wherein the instructions when executed additionally cause the wireless communications cell site to:

receive an operational status of a back-haul that is coupled to a communications interface; and

selectively employ the generator based, at least in part, on the received operational status of the back-haul.