SINGLE CHIP SOLUTION FOR SOLAR-BASED SYSTEMS

• US 20090152947A1
• Filed: 02/19/2008
• Published: 06/18/2009
• Est. Priority Date: 12/17/2007
• Status: Active Grant

• Current Assignee: Shay-Ping Thomas Wang
• Original Assignee: Shay-Ping Thomas Wang
• Inventors: Wang, Shay-Ping Thomas
• Granted Patent: US 7,830,038 B2
• Time in Patent Office: Days
• US Class Current: 307/24
• CPC Class Codes: H02J 1/14 Balancing the load in a network
• CPC Class Codes: H02J 2300/26 involving maximum power point tracking control for photovoltaic sources maximum power point systems in particular G05F1/67
• CPC Class Codes: H02J 2310/60 Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02J 4/00 Circuit arrangements for mains or distribution networks not specified as ac or dc
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

In one embodiment there is provided a power management system for managing the power from solar panels and rechargeable batteries to power a system that includes DC loads and AC loads. The power management system includes a DC-DC converter in communication with the solar panels, a first switch positioned to control power from the DC-DC converter, to and from the rechargeable batteries, and to the DC loads and AC loads, and when in response to a power requirement from the system being equal to or less than a solar panel power provided by the solar panels, the first switch automatically set, by the power management system, to supply the system with only the solar panel power, and wherein any excess solar panel power not consumed by the system is at the same time automatically directed to recharge the rechargeable battery.

Claims

1. A power management system for managing the power from solar panels and rechargeable batteries to power a system that includes DC loads and AC loads, the power management system comprising:

a first switch positioned to control power from the solar panels to and from the rechargeable batteries, and to the DC loads and AC loads, and

when in response to a power requirement from the system being equal to or less than a solar panel power provided by the solar panels, said first switch automatically set, by the power management system, to supply the system with only said solar panel power, and wherein any excess solar panel power not consumed by the system is at the same time automatically directed to recharge the rechargeable battery.

2. The system of claim 1, wherein said power management system further includes a DC-AC inverter between the first switch and the AC loads.

17. The power management system of claim 1, wherein the rechargeable batteries comprise an energy storage device such as a super capacitor.

3. A power management system for managing the power from solar panels and rechargeable batteries to power a system that includes DC loads and AC loads, the power management system comprising:

a first switch positioned to control power from the solar panels, to and from the rechargeable batteries, and from the rechargeable batteries to the DC loads and AC loads;

a second switch positioned to control power from the solar panels to the DC loads; and

a third switch positioned to control power from the solar panels to the AC loads,

when in response to a power requirement from the system being equal to or less than a solar panel power provided by the solar panels, said first switch automatically set, by the power management system, to supply the system with only said solar panel power, and wherein any excess solar panel power not consumed by the system is at the same time automatically directed to recharge the rechargeable battery, and

when in response to the DC loads having a higher priority than the AC loads, said second and third switches automatically set, by the power management system, to supply power only to the DC loads, and when in response to the AC loads having a higher priority than the DC loads, said second and third switch automatically set, by the power management system, to supply power only to the AC loads.

4. The power management system of claim 3, when in response to a power requirement from the system being greater than the solar panel power provided by the solar panels but less then a combined power from solar panel power and the rechargeable battery, said first switch automatically set, by the power management system, to supplement the system with power from the rechargeable batteries.

5. The power management system of claim 4, when the AC loads includes a power grid load.

6. The power management system of claim 3 further comprising when in response to a power requirement from the system being greater than a combined power from solar panel power and the rechargeable battery, said second and third switches automatically set, by the power management system, to reduce the power requirement from the system by turning power off to either the DC loads or the AC loads dependent upon whether the DC loads or the AC loads have a higher priority than the other.

7. The power management system of claim 3, wherein the third switch is positioned to control power from the solar panels to the AC loads and a fourth switch is positioned to control power from the solar panels to an outside AC power grid.

8. The power management system of claim 7 further comprising when in response to a power requirement from the system being greater than a combined power from solar panel power and the rechargeable battery, said second, third and fourth switches automatically set, by the power management system, to reduce the power requirement from the system by turning power off to either the DC loads, the AC loads, or the AC power grid dependent upon whether the DC loads, the AC loads, or the AC power grid have a higher priority than the other.

9. The power management system of claim 8, wherein the higher priority is set by first turning off the power to the AC power grid, and then turning off power to the DC loads, and then turning off power to the AC loads.

10. A power management system for managing the power from renewable power source and rechargeable batteries to power a system that includes DC loads and AC loads, the power management system comprising:

a first switch positioned to control power from the renewable power source;

a second switch positioned between the first switch and the rechargeable batteries to control power to and from the rechargeable batteries;

a third switch positioned between the first and the DC loads to control power to the DC loads; and

a fourth switch positioned between the first switch and the AC loads to control power to the AC loads,

when in response to a power requirement from the system being equal to or less than a renewable power provided by the renewable power source, said first, second, third, and fourth switches automatically set, by the power management system, to supply the system with only said renewable power, and wherein any excess renewable power not consumed by the system is at the same time automatically directed to recharge the rechargeable battery, and

when in response to a power requirement from the system being greater than a combined power from renewable power source and the rechargeable battery, said third and fourth switches automatically set, by the power management system, to reduce the power requirement from the system by turning power off to either the DC loads or the AC loads dependent upon whether the DC loads or the AC loads have a higher priority than the other.

11. The power management system of claim 10, wherein when in response to the DC loads having a higher priority than the AC loads, said fourth switch automatically turned off and said third switch automatically turned on, by the power management system, such that power is supplied only to the DC loads, and when in response to the AC loads having a higher priority than the DC loads, said third switch automatically turned off and said fourth switch automatically turned on, by the power management system, such that power is supplied only to the AC loads.

12. The power management system of claim 10, wherein renewable power source are provided by solar panels.

13. The power management system of claim 10, wherein renewable power source is provided by solar panels, wind turbines, biomass, or water turbines.

14. The power management system of claim 10, wherein the fourth switch is positioned to control power from the solar panels to the AC loads and a fifth switch is positioned to control power from the solar panels to an outside AC power grid.

15. The power management system of claim 14 further comprising when in response to a power requirement from the system being greater than a combined power from solar panel power and the rechargeable battery, said third, fourth, and fifth switches automatically set, by the power management system, to reduce the power requirement from the system by turning power off to either the DC loads, the AC loads, or the AC power grid dependent upon whether the DC loads, the AC loads, or the AC power grid have a higher priority than the other.

16. The power management system of claim 15, wherein the higher priority is set by first turning off the power to the AC power grid, and then turning off power to the DC loads, and then turning off power to the AC loads.