Auxiliary power supply and user device including the same

A solid state drive, comprising:

• a memory system, the memory system including at least one memory;
• a first controller configured to control the memory system;
• an auxiliary power system configured to provide auxiliary power to at least the memory system, the auxiliary power system including,
• a first detector configured to detect a sudden main power off of an external main power supply;
• an auxiliary power source configured to provide auxiliary power;
• a second detector configured to detect a power level of the auxiliary power source;
• a second controller configured to perform at least one memory protection operation using power from the auxiliary power source if the first detector detects the sudden main power off, and configured to perform the memory protection operation until the second detector indicates the power level of the auxiliary power source drops below a threshold;
• and wherein
• the auxiliary power source is configured to provide the auxiliary power before and after the second detector indicates the power level of the auxiliary power source drops below the threshold.

An auxiliary power system associated with a memory system, comprising:

• a first one directional device configured to only permit current to flow there through in a first direction, the first direction being from an external main power supply to the memory system;
• an auxiliary power source;
• and
• a second one directional device configured to only permit current to flow there though in a second direction, the second direction being from the auxiliary power source to the memory system.

An auxiliary power system, comprising:

• a first power supply line;
• a second power supply line;
• a first one directional device connected between the first and second power supply lines and configured to prevent current from flowing from the second power supply line to an external power supply via the first power supply line;
• an auxiliary power source;
• a second one directional device connected between the second power supply line and the auxiliary power source, and configured to prevent current from flowing from the second power supply line to the auxiliary power source.

A portable storage device, comprising:

• a memory interface configured to interface with a memory system;
• a host interface configured to interface with a host;
• a processor configured to communicate with the memory system via the memory interface and configured to communicate with the host via the host interface;
• and
• an auxiliary power system configured to provide auxiliary power, the auxiliary power system including,
• a first one directional device configured to only permit current to flow there through in a first direction, the first direction being from an external main power supply to the memory system,
• an auxiliary power source, and
• a second one directional device configured to only permit current to flow there though in a second direction, the second direction being from the auxiliary power source to the processor.

An electronic device, comprising:

• a user interface;
• a memory system including a cache memory and a main memory;
• a processor connected to the user interface and the memory system via a bus;
• and
• an auxiliary power system connected to the bus, and configured to provide auxiliary power, the auxiliary power system including,
• a first one directional device configured to only permit current to flow there through in a first direction, the first direction being from an external main power supply to the bus,
• an auxiliary power source, and
• a second one directional device configured to only permit current to flow there though in a second direction, the second direction being from the auxiliary power source to the bus.

A method of operating an auxiliary power system, comprising:

• receiving external main power at a first power supply line from an external main power supply;
• preventing, via at least one device of an auxiliary power supply, current flowing through a second power supply line from flowing to the first power supply line and the external main power supply;
• and
• preventing current from flowing from the second power supply line to an auxiliary power source electrically connected to the second power supply line.