Super capacitor and charger for secondary power having longevity features

摘要

A secondary power source system for a communication device includes a charging unit configured to receive a primary power input and restrict a current used for charging to a predetermined amount. The current is part of a first output of the charging unit. The system further includes a storage unit including a device that stores electrical energy, the storage unit configured to receive the first output from the charging unit with restricted current and generate a second output, a regulating unit configured to receive the second output from the storage unit and generate a third output, a selector unit configured to perform a logical OR operation with the primary power input, the first output from the charging unit and third output from the regulating unit, and to generate a fourth output, and a shutdown unit configured to shutdown operation of the secondary power system when the storage unit has been expended.

主权项

1. A secondary power source system for a communication device, comprising:
a charging unit configured to receive a primary power input and restrict a current used for charging to a predetermined amount, wherein the current is part of a first output of the charging unit; a storage unit comprising a device that stores electrical energy, the storage unit configured to receive the first output from the charging unit with restricted current and generate a second output; a regulating unit configured to receive the second output from the storage unit and generate a third output, wherein the regulating unit further comprises a boost converter; a selector unit configured to perform a logical operation with the primary power input, the first output from the charging unit and the third output from the regulating unit, and to generate a fourth output; a shutdown unit configured to shutdown operation of the secondary power source system when the storage unit has been expended, and wherein the shutdown unit is configured to isolate the boost converter from the storage unit; and an isolation circuit, wherein the shutdown unit is configured to isolate the boost converter from the storage unit with the isolation circuit, wherein the isolation circuit is tied to ground.