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Cambridge, MA, United States

Lim S.,Massachusetts Institute of Technology | Ranson J.,FINsix Corporation | Otten D.M.,Massachusetts Institute of Technology | Perreault D.J.,Massachusetts Institute of Technology
IEEE Transactions on Power Electronics | Year: 2014

This paper presents a merged-two-stage circuit topology suitable for either wide-range dc input voltage or ac line voltage at low-to-moderate power levels (e.g., up to 30 W). This two-stage topology is based on a soft-charged switched-capacitor preregulator/transformation stage and a high-frequency magnetic regulator stage. Soft charging of the switched capacitor circuit, zero voltage switching of the high-frequency regulator circuit, and time-based indirect current control are used to maintain high efficiency, high power density, and high power factor. The proposed architecture is applied to an LED driver circuit, and two implementations are demonstrated: a wide input voltage range dc-dc converter and a line interfaced ac-dc converter. The dc-dc converter shows 88%-96% efficiency at 30-W power across 25-200-V input voltage range, and the ac-dc converter achieves 88% efficiency with 0.93 power factor at 8.4-W average power. Contributions of this paper include: 1) demonstrating the value of a merged two-stage architecture to provide substantial design benefits in high-input voltage, low-power step down conversion applications, including both wide-range-input dc-dc and line-input ac-dc systems; 2) introduction of a multimode soft-charged SC stage for the merged architecture that enables compression of an 8:1 input voltage range into a 2:1 intermediate range, along with its implementation, loss considerations, and driving methods; and 3) merging of this topology with an resonant transition discontinuous-mode inverted buck stage and pseudocurrent control to enable step-down power conversion (e.g., for LED lighting) operating at greatly increased frequencies and reduced magnetics size than with more conventional approaches. © 2014 IEEE.

FINsix Corporation | Date: 2015-02-19

Electric power converters; electrical power supplies; electric adaptors.

FINsix Corporation | Date: 2014-03-24

Power adapters for consumer electronic devices.

FINsix Corporation | Date: 2014-03-14

A power module includes a housing and an AC/DC converter within the housing. The AC/DC converter is configured to convert an AC input signal into a DC output signal. The power module also includes an actuated heat removal device. The actuated heat removal device is configured to remove heat produced by the AC/DC converter from the housing.

FINsix Corporation | Date: 2014-03-14

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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