Interleaved LLC converter employing active balancing

1. An interleaved converter, comprising: a plurality of LLC power channels having a power input provided by a respective power source; and a compensation controller configured to actively adjust said power inputs to match output voltage and current levels for a given load condition and a common operating frequency of said plurality of LLC power channels, wherein said compensation controller is configured to adjust said power inputs by controlling said power sources based on a power source output voltage received at said compensation controller directly from each of said power sources wherein said compensation controller is configured to adjust said power inputs by controlling a first power source of said power sources using a first modulator in said compensation controller and controlling a second power source of said power sources using a second modulator in said compensation controller.

2. The interleaved converter as recited in claim 1 wherein each of said power sources is a boost pre-regulator.

3. The interleaved converter as recited in claim 2 wherein each said boost pre-regulator is a power factor correcting circuit.

4. The interleaved converter as recited in claim 1 wherein said compensation controller is configured to control said power sources based on input currents of said plurality of LLC power channels.

5. The interleaved converter as recited in claim 1 wherein said compensation controller is configured to regulate input currents of said plurality of LLC power channels to actively balance said plurality of LLC power channels.

6. A method of operating a converter having a first LLC power channel and a second LLC power channel, the method comprising:

generating, at a first LLC power stage of the first LLC power channel, a first DC power output from a first power input;

generating, at a second LLC power stage of the second LLC power channel, a second DC power output from a second power input;

receiving, at a compensation controller, a first power source output voltage directly from a first power source that generates the first power output;

receiving, at the compensation controller, a second power source output voltage directly from a second power source that generates the second power output;

adjusting, using the compensation controller, the first and second power inputs by controlling the first and second power sources to match output voltage and current levels for a given load condition and a common operating frequency between the first and the second LLC power stages; and

interleaving the first DC power output and the second DC power output to provide output power for the converter.

7. The method as recited in claim 6 wherein adjusting the first and second power inputs comprises controlling the first power source using a first modulator in the compensation controller and controlling the second power source using a second modulator in the compensation controller.

8. The method as recited in claim 6 wherein the first power source is a first boost pre-regulator for the first LLC power channel and the second power source is a second boost pre-regulator for the second LLC power channel.

9. The method as recited in claim 8 wherein the first boost pre-regulator is a power factor correcting circuit for the first LLC power channel and the second boost pre-regulator is a second power factor correcting circuit for the second LLC power channel.

10. The method as recited in claim 7 wherein said controlling the first and second power sources is based on input currents of the first and second LLC power channels.

11. The method as recited in claim 6 further comprising regulating input currents of the first and second LLC power channels to match the output voltage and current levels.

12. A power supply, comprising:

a first LLC power channel having a first LLC power stage and a first power source configured to generate a first power input for said first LLC power stage;

a second LLC power channel having a second LLC power stage and a second power source configured to generate a second power input for said second LLC power stage, wherein outputs of said first and said second LLC power stages are interleaved; and

a compensation controller configured to:

receive a first power source output voltage directly from said first power source;

receive a second power source output voltage directly from said second power source; and

adjust said first and said second power inputs to match output voltage and current levels for a given load condition and a common operating frequency of said first and second LLC power stages.

13. The power supply as recited in claim 12 wherein each of said first and second power sources is a boost pre-regulator.

14. The power supply as recited in claim 13 wherein each said boost pre-regulator is a power factor correcting circuit.

15. The power supply as recited in claim 12 wherein said compensation controller is configured to adjust said first and second power inputs by modulating a first voltage magnitude of said first power source using a first modulator and modulating a second voltage magnitude of said second power source using a second modulator.

16. The power supply as recited in claim 15 wherein said compensation controller is configured to perform the modulating by forcing equal input currents of said first and second LLC power channels.

17. The power supply as recited in claim 12 wherein said compensation controller is configured to match the output voltage and current levels by regulating input currents of said first and second LLC power channels.