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A power conversion module, such as a power adapter, includes a heat removal system such as an active heat removal system, a passive heat removal system or a hybrid heat removal system. A small-size power conversion module having a heat removal system is described.

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1. A power adapter, comprising: a housing;power and control circuitry in the housing, the power and control circuitry including an AC/DC converter configured to convert an AC input signal into a DC output signal;at least one compartment in the housing, the at least one compartment comprising a phase

1. A power adapter, comprising: a housing;power and control circuitry in the housing, the power and control circuitry including an AC/DC converter configured to convert an AC input signal into a DC output signal;at least one compartment in the housing, the at least one compartment comprising a phase change material, the at least one compartment including a first compartment positioned around the power and control circuitry on at least four sides of the power and control circuitry or a plurality of compartments either individually or collectively positioned around the power and control circuitry on at least four sides of the power and control circuitry, the phase change material having a transition temperature between 25° C. and 85° C.; anda second material having a thermal conductivity higher than that of the phase change material, the second material extending from the power and control circuitry toward the housing, the second material separating first and second regions of the phase change material on at least a first side of the at least four sides of the power adapter. 2. The power adapter of claim 1, wherein the transition temperature of the phase change material is between 30° C. and 50° C. 3. The power adapter of claim 1, wherein the second material comprises a metal. 4. The power adapter of claim 1, wherein the power adapter has a volume no greater than 3 cubic inches. 5. The power adapter of claim 4, wherein the phase change material is of a volume and configuration such that a temperature of an exterior surface of the housing remains below a temperature of 40° C. when the power adapter delivers an average power of at least 45 W for a period of at least 30 minutes. 6. The power adapter of claim 5, wherein the period of the at least 30 minutes is 2 hours. 7. The power adapter of claim 1, wherein the power and control circuitry further includes a controller configured to control the AC/DC converter, wherein the controller is configured to change an amount of output power produced by the AC/DC converter based on a temperature of the power adapter. 8. The power adapter of claim 7, wherein the power adapter has a volume no greater than 4 cubic inches. 9. The power adapter of claim 1, further comprising: a plurality of posts comprising the second material, the plurality of posts extending from an interior of the power adapter toward a periphery of the power adapter. 10. The power adapter of claim 9, wherein the plurality of posts are on the first side and a second side of the at least four sides of the power adapter. 11. The power adapter of claim 10, wherein the plurality of posts are further on third and fourth sides of the at least four sides of the power adapter. 12. The power adapter of claim 9, wherein at least one post of the plurality of posts contacts the housing. 13. The power adapter of claim 1, wherein the at least one compartment comprises a plurality of compartments, each of the compartments comprising the phase change material, wherein the first compartment of the plurality of compartments is separated from a second compartment of the plurality of compartments by a region of the second material. 14. The power adapter of claim 13, wherein each of the first compartment, the second compartment and the region of the second material surrounds the power and control circuitry. 15. The power adapter of claim 1, comprising alternating regions of the second material and the phase change material. 16. A power adapter, comprising: a housing;power and control circuitry in the housing, the power and control circuitry including an AC/DC converter configured to convert an AC input signal into a DC output signal;a first end including a plug comprising a plurality of prongs to receive the AC input signal;a second end having a DC output connection port configured to connect to a connector of a cord to provide the DC output signal to the cord;at least one compartment in the housing, the at least one compartment comprising a phase change material, the at least one compartment including a first compartment positioned around the power and control circuitry on at least four sides of the power and control circuitry or a plurality of compartments either individually or collectively positioned around the power and control circuitry on at least four sides of the power and control circuitry; anda second material having a thermal conductivity higher than that of the phase change material, the second material separating first and second regions of the phase change material on at least a first side of the power adapter,wherein the power adapter has a volume no greater than 4 cubic inches, andwherein the power adapter is configured to deliver an output power of at least 40 watts. 17. The power adapter of claim 16, wherein the phase change material has a transition temperature such that the phase change material changes phase during operation of the power adapter. 18. The power adapter of claim 17, wherein the transition temperature of the phase change material is between 25° C. and 85° C. 19. The power adapter of claim 16, further comprising: a plurality of posts comprising the second material, the plurality of posts extending from an interior of the power adapter toward a periphery of the power adapter. 20. The power adapter of claim 19, wherein the plurality of posts are on the first side and a second side of the power adapter. 21. The power adapter of claim 20, wherein the plurality of posts are further on third and fourth sides of the at least four sides of the power adapter. 22. The power adapter of claim 19, wherein at least one post of the plurality of posts contacts the housing. 23. The power adapter of claim 16, wherein the at least one compartment comprises a plurality of compartments comprising the phase change material, wherein the first compartment of the plurality of compartments is separated from a second compartment of the plurality of compartments by a region of the second material. 24. The power adapter of claim 23, wherein each of the first compartment, the second compartment and the region of the second material surrounds the power and control circuitry. 25. The power adapter of claim 16, comprising alternating regions of the second material and the phase change material. 26. A power adapter, comprising: a housing;power and control circuitry in the housing, the power and control circuitry including an AC/DC converter configured to convert an AC input signal into a DC output signal;at least one compartment in the housing, the at least one compartment comprising a phase change material, the at least one compartment including a first compartment surrounding the power and control circuitry or a plurality of compartments either individually or collectively surrounding the power and control circuitry, the phase change material having a transition temperature between 25° C. and 85° C.; anda second material having a thermal conductivity higher than that of the phase change material, the second material extending from an interior of the power adapter toward a periphery of the power adapter, the second material separating first and second regions of the phase change material. 27. The power adapter of claim 26, wherein the transition temperature of the phase change material is between 30° C. and 50° C. 28. The power adapter of claim 26, wherein the second material comprises a metal. 29. The power adapter of claim 26, further comprising: a plurality of posts comprising the second material, the plurality of posts extending from an interior of the power adapter toward the periphery of the power adapter. 30. The power adapter of claim 29, wherein at least one post of the plurality of posts contacts the housing. 31. The power adapter of claim 26, wherein the at least one compartment comprises a plurality of compartments comprising the phase change material, wherein the first compartment of the plurality of compartments is separated from a second compartment of the plurality of compartments by a region of the second material. 32. The power adapter of claim 26, wherein the power adapter has a volume no greater than 4 cubic inches.