System and method using phase detection to equalize power from multiple power sources
First Claim
1. A system for supplying power to a load, said system comprising:
- first and second power sources for supplying power to said load, said power sources having a similar relationship between a variable switching frequency of said power source and the power supplied by said power source to said load; and
,phase detection means coupled to at least one of said first and second power sources for locking first and second switching frequencies of, respectively, said first and second power sources to one another to substantially equalize the power supplied to said load by each power source.
3 Assignments
0 Petitions
Accused Products
Abstract
A system and a method may use variable-frequency power sources for supplying power to a load. The system and method use phase detection in order to automatically and substantially equalize the currents supplied to a load by each of the variable-frequency power sources, and to cancel a ripple component of the input current drawn by the system. First and second power sources supply power to the load. The power sources have a similar relationship between their respective variable switching frequencies and the power that they supply to the load. First and second switching frequencies of, respectively, the first and second power sources are locked to one another using phase detection to substantially equalize the power supplied to the load by each power source. The system and method are advantageously utilized to provide a power factor correction front-end for a switch-mode power supply. Power sources with non-linear and/or inverse relationships between power supplied and switching frequency can be used. In alternate embodiments power from series power sources is equalized by equalizing voltages supplied by each power source to a load.
69 Citations
30 Claims
-
1. A system for supplying power to a load, said system comprising:
-
first and second power sources for supplying power to said load, said power sources having a similar relationship between a variable switching frequency of said power source and the power supplied by said power source to said load; and
,phase detection means coupled to at least one of said first and second power sources for locking first and second switching frequencies of, respectively, said first and second power sources to one another to substantially equalize the power supplied to said load by each power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for providing power factor correction to a power supply, said system comprising:
-
first and second power sources for supplying input power to said power supply, where each of said power sources has a relationship between the power supplied by said power source and a switching frequency of said power source that can be either linear or non-linear and either direct or inverse, said first and second power sources having a similar such relationship; and
,phase detection means for locking first and second switching frequencies of, respectively, said first and second power sources to one another to substantially equalize the input power supplied to said power supply by each of said power sources. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A method for supplying power to a load, said method comprising the steps of:
-
selecting first and second power sources having a similar relationship between a variable switching frequency of said power source and the power supplied by said power source to said load; varying at least one of first and second switching frequencies of, respectively, said first and second power sources; generating an error signal; and
,coupling said error signal to at least one of said first and second power sources to lock said switching frequencies to one another to substantially equalize the power supplied to said load by each of said power sources. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
26. A method for providing power factor correction to a power supply, said method comprising the steps of:
-
selecting first and second power sources to have a similar relationship between a switching frequency of said power source and the input power supplied by said power source to said power supply; setting at least one of a first and second switching frequencies of, respectively, said first and second power sources, where said switching frequencies have a relationship to the power supplied by their respective power source that can be either linear or non-linear and either direct or inverse; and
,locking said switching frequencies to one another using phase detection to substantially equalize the input power supplied to said power supply by each of said power sources. - View Dependent Claims (27, 28, 29, 30)
-
Specification