Very low voltage power distribution for mobile devices

• US 20060271701A1
• Filed: 08/31/2005
• Published: 11/30/2006
• Est. Priority Date: 05/31/2005
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: Sutardja, Sehat
• Granted Patent: US 7,610,498 B2
• Time in Patent Office: Days
• US Class Current: 709/238
• CPC Class Codes: G06F 1/1613 for portable computers cooling arrangements therefor G06F1/203; constructional details or arrangements for pocket calculators, electronic agendas or books G06F15/0216; constructional details of portable telephone sets: with several bodies H04M1/0202
• CPC Class Codes: G06F 1/1635 Details related to the integration of battery packs and other power supplies such as fuel cells or integrated AC adapter
• CPC Class Codes: G06F 1/189 Power distribution
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence

Abstract

A mobile computing device comprises a central processing unit (CPU), memory that communicates with said CPU, an interface that communicates with said memory and said CPU and a display that communicates with said interface. A first distributed load center has first and second load terminals and includes at least a first distributed load. A second distributed load center has first and second load terminals and includes at least a second distributed load. A first distributed power source includes a first battery that is directly connected and primarily supplies power to the first and second load terminals of the first distributed load center. A second distributed power source includes a second battery that is directly connected and primarily supplies power to the first and second load terminals of the second distributed load center.

Claims

1. A mobile computing device, comprising:

a central processing unit (CPU);

memory that communicates with said CPU;

an interface that communicates with said memory and said CPU;

a display that communicates with said interface;

a first distributed load center having first and second load terminals and including at least a first distributed load, wherein said first distributed load includes at least one load that is selected from a group consisting of said CPU, said memory, a graphics processing unit (GPU) that communicates with said interface, a hard disk drive (HDD) that communicates with said interface, and a DVD drive that communicates with said interface;

a second distributed load center having first and second load terminals and including at least a second distributed load, wherein said second distributed load includes at least one load that is selected from a group consisting of said CPU, said memory, a graphics processing unit (GPU) that communicates with said interface, a hard disk drive (HDD) that communicates with said interface, and a DVD drive that communicates with said interface;

a first distributed power system that includes a first battery that is directly connected and primarily supplies power to said first and second load terminals of said first distributed load center; and

a second distributed power system that includes a second battery that is directly connected and primarily supplies power to said first and second load terminals of said second distributed load center,

wherein said first load terminals of said first and second distributed load communicate and said second load terminals of said first and second distributed load center communicate, and

wherein said first distributed power system supplies power to said second distributed load center and wherein said second distributed power system supplies power to said first distributed load center.

2. The mobile computing device of claim 1 further comprising a sensing and protection module that senses current flowing to said first distributed power system and that selectively decreases said current.

3. The mobile computing device of claim 1 wherein said mobile computing device comprises a laptop computer.

4. The mobile computing device of claim 1 further comprising a battery pack that includes said first and second batteries.

5. The mobile computing device of claim 1 further comprising a first battery pack that includes said first battery and a second battery pack that includes said second battery.

6. The mobile computing device of claim 1 wherein said first and said second batteries include Lithium Ion batteries.

7. The mobile computing device of claim 1 further comprising a battery pack that includes said first battery, said second battery, and a first connection between first terminals of said first and second batteries and a second connection between second terminals of said first and second batteries.

8. The mobile computing device of claim 1 further comprising a motherboard that provides connections between said first load terminals of said first and second distributed load centers and between said second load terminals of said first and second distributed load centers.

9. The mobile computing device of claim 8 wherein said connections include:

first metal stiffeners that connect said first terminals of said first and second distributed load centers to a power traces/planes of said motherboard; and

second metal stiffeners that connect said second terminals of said first and second distributed load centers to a ground traces/planes of said motherboard.

10. The mobile computing device of claim 1 wherein said first battery has a first capacity and said second battery has a second capacity that is different than said first capacity.

11. The mobile computing device of claim 5 wherein said first battery pack has first physical dimensions and said second battery pack has second physical dimensions, and wherein at least one of said first physical dimensions is different than at least one of said second physical dimensions.

12. The mobile computing device of claim 5 wherein said first battery pack is located remotely from said second battery pack in said mobile computing device.

13. The mobile computing device of claim 1 further comprising a first DC/DC converter that receives a first voltage from said first battery and that outputs a second voltage to said first distributed load center.

14. The mobile computing device of claim 13 wherein said DC/DC converter is one of a step-down converter and a step-up converter.

15. The mobile computing device of claim 13 further comprising a second DC/DC converter that receives a third voltage from said first battery and that outputs a fourth voltage to said second distributed load center.

16. The mobile computing device of claim 1 further comprising:

a first DC/DC converter that receives a first voltage from said first battery and that outputs a second voltage;

a second DC/DC converter that receives said second voltage from said first DC/DC converter and that outputs a third voltage to said first distributed load center.

17. The mobile computing device of claim 15 wherein said first DC/DC converter is a step-down converter and said second DC/DC converter is a step-up converter.

18. The mobile computing device of claim 17 wherein said second DC/DC converter is a 1:

n converter.

19. The mobile computing device of claim 1 wherein at least one of said first battery and said second battery includes a universal serial bus (USB) battery.

20. The mobile computing device of claim 19 wherein said USB battery includes a short circuit protection device.

21. The mobile computing device of claim 1 wherein said first distributed load center operates at a first voltage and said second distributed load center operates at at least one of said first voltage and a second voltage.

22. The mobile computing device of claim 13 wherein said DC/DC converter has a conversion ratio that is less than or equal to 4:

1.

23. The mobile computing device of claim 1 further comprising:

a first contactor that selectively disconnects at least one of first and second terminals of said first distributed power system;

a second contactor that selectively disconnects at least one of first and second terminals of said second distributed power system; and

a short circuit detecting module that communicates with at least one of said first and second contactors, that detects a short circuit in at least one of said first and second distributed power systems and that selectively disconnects at least one of said first and second distributed power systems.

24. The mobile computing device of claim 16 wherein said first DC/DC converter operates at a first frequency and said second DC/DC converter operates at a second frequency that is different than said first frequency.

49. The mobile computing device of claim 2 wherein said sensing and protection module includes a plurality of transistors that selectively increase resistance between said first distributed power system and said first distributed load center.

50. The mobile computing device of claim 2 wherein said sensing and protection module includes a resistance and parallel switch that selectively increase resistance between said first distributed power system and said first distributed load center.

51. The mobile computing device of claim 50 wherein said resistance is a variable resistance.

25. A method of providing a mobile computing device, comprising:

providing a central processing unit (CPU), memory that communicates with said CPU, an interface that communicates with said memory and said CPU, and a display that communicates with said interface;

providing a first distributed load center having first and second load terminals and including at least a first distributed load, wherein said first distributed load is selected from a group consisting of said central processing unit (CPU), said memory, a graphics processing unit (GPU), a hard disk drive (HDD), and a DVD drive;

providing a second distributed load center having first and second load terminals and including at least a second distributed load, wherein said second distributed load is selected from a group consisting of said central processing unit (CPU), said memory, a graphics processing unit (GPU), a hard disk drive (HDD), and a DVD drive;

distributing power to said first distributed load center using a first battery that is directly connected and supplies power to said first and second load terminals of said first distributed load center; and

distributing power to said second distributed load center using a second battery that is directly connected and supplies power to said first and second load terminals of said second distributed load center,

wherein said first load terminals of said first and second distributed load communicate and said second load terminals of said first and second distributed load center communicate, and

wherein said first distributed power system supplies power to said second distributed load center and wherein said second distributed power system supplies power to said first distributed load center.

26. The method of claim 25 further comprising:

sensing current flowing through said first and second batteries; and

limiting current flowing through said first and second batteries based on said sensed current.

27. The method of claim 25 further comprising implementing said distributed power system in a laptop computer.

28. The method of claim 25 further comprising packaging said first and second batteries in a battery pack.

29. The method of claim 25 further comprising packaging said first battery in a first battery pack and said second battery in a second battery pack.

30. The method of claim 25 wherein said first and second batteries comprise Lithium Ion batteries.

31. The method of claim 25 further comprising providing a battery pack that includes said first battery, said second battery, and a first connection between first terminals of said first and second batteries and a second connection between second terminals of said second batteries.

32. The method of claim 25 further comprising providing connections between first terminals of said first and second batteries and between second terminals of said first and second batteries using a motherboard.

33. The method of claim 32 further comprising using first metal stiffeners to connect said first terminals of said first and second batteries to power traces/planes of said motherboard and second metal stiffeners to connect said second terminals of said first and second batteries to a ground traces/planes of said motherboard.

34. The method of claim 25 wherein said first battery has a first capacity and said second battery has a second capacity that is not equal to said first capacity.

35. The method of claim 29 wherein said first battery pack has first physical dimensions and said second battery pack has second physical dimensions, and wherein at least one of said first physical dimensions is different than at least one of said second physical dimensions.

36. The method of claim 29 further comprising locating said first battery pack remotely from said second battery pack in said mobile computing device.

37. The method of claim 25 further comprising providing a first DC/DC converter that receives a first voltage from said first battery and that outputs a second voltage to said first load.

38. The method of claim 37 wherein said DC/DC converter is one of a step-down converter and a step-up converter.

39. The method of claim 37 further comprising providing a second DC/DC converter that receives a third voltage from said first battery and that outputs a fourth voltage to said second load.

40. The method of claim 25 further comprising:

providing a first DC/DC converter that receives a first voltage from said first battery and that outputs a second voltage;

providing a second DC/DC converter that receives said second voltage from said first DC/DC converter and that outputs a third voltage to said first load.

41. The method of claim 39 wherein said first DC/DC converter is a step-down converter and said second DC/DC converter is a step-up converter.

42. The method of claim 41 wherein said second DC/DC converter is a 25:

n converter.

43. The method of claim 25 wherein at least one of said first battery and said second battery includes a universal serial bus (USB) battery.

44. The method of claim 43 wherein said USB battery includes a short circuit protection device.

45. The method of claim 25 wherein said first distributed load center operates at a first voltage and said second distributed load center operates at at least one of said first voltage and a second voltage.

46. The method of claim 37 wherein said DC/DC converter has a conversion ratio that is less than or equal to 4:

1.

47. The method of claim 25 further comprising:

selectively disconnecting at least one of said first and second terminals of said first battery;

selectively disconnecting at least one of said first and second terminals of said second battery; and

detecting a short circuit in at least one of said first and second batteries and selectively disconnecting at least one of said first and second batteries.

48. The method of claim 40 wherein said first DC/DC converter operates at a first frequency and said second DC/DC converter operates at a second frequency that is different than said first frequency.