ORing FET control method for battery backup system

A system for managing a high efficient battery backup (BBU) system that comprises a microcontroller unit (MCU), a battery pack, and an ORing FET system, comprising:

• a processor;
• and
• a non-transitory computer-readable medium storing instructions that, when executed by the processor, cause the system to perform operations comprising:
• receiving, at a controller of a server system, status information of an AC power supply and a power supply unit (PSU) of the server system;
• in an event that either the AC power supply or the PSU fails, generating a discharging-enable command to enable the high efficient battery system to discharge power to the server system;
• causing the MCU to enable FETs of the Oring FET system to operate in a saturation region;
• causing the battery pack to discharge power to a main DC bus of the server system;
• in an event that both the PSU and the AC power supply are ok, determining that the battery system does not need capacity calibration;
• generating a charging-enable command to enable the BBU system to be charged by a power supply unit (PSU) of the server system;
• receiving status information of the battery system, including an output voltage of the battery pack;
• in an event that the output voltage of the battery pack is below a predetermined low value, generating a constant-current-charging-enable command to enable the BBU system to enter into a constant-current-charging mode;
• and
• causing the MCU to enable the FETs of the ORing FET system to operate in an ohmic region.

A non-transitory computer-readable storage medium including instructions that, when executed by at least one processor of a system, cause the system to perform operations managing a high efficient battery backup (BBU) system that comprises a microcontroller unit (MCU), a battery pack, and an ORing FET system, comprising:

• receiving, at a controller of a server system, status information of an AC power supply and a power supply unit (PSU) of the server system;
• in an event that either the AC power supply or the PSU fails, generating a discharging-enable command to enable the high efficient battery system to discharge power to the server system;
• causing the MCU to enable FETs of the ORing FET system to operate in a saturation region;
• causing the battery pack to discharge power to a main DC bus of the server system;
• in an event that both the PSU and the AC power supply are ok, determining that the battery system does not need capacity calibration;
• generating a charging-enable command to enable the BBU system to be charged by a power supply unit (PSU) of the server system;
• receiving status information of the battery system, including an output voltage of the battery pack;
• in an event that the output voltage of the battery pack is below a predetermined low value, generating a constant-current-charging-enable command to enable the BBU system to enter into a constant-current-charging mode;
• and
• causing the MCU to enable the FETs of the ORing FET system to operate in an ohmic region.