Multi-power input port power control
An information handling system with multiple power input ports, such as USB ports, capable of receiving power from external power supplies may control power received from the power supplies. A first controller may detect a first power supply coupled to a first power input port of the system and may allow power to flow from the external power supply to the system. Any additional power supplies detected by controllers may be blocked from providing power to the system while the first power supply is providing power.
1. An information handling system, comprising:
a first power input port;
a second power input port;
a first controller coupled to the first power input port;
a second controller coupled to the second power input port; and
a charger coupled to a power output of the first controller and a power output of the second controller,
wherein the first controller is configured to block power received at the first power input port from entering the system when the system is receiving power from a power source coupled to the second power input port, and
wherein the second controller is configured to block power received at the second power input port from entering the system when the system is receiving power from a power source coupled to the first power input port.
2. The information handling system of claim 1 , further comprising:
a third power input port; and
a third controller coupled to the third power input port,
wherein the third controller is configured to block power received at the third power input port from entering the system when the system is receiving power from a power source coupled to either the first power input port or the second power input port,
wherein the first controller is further configured block power received at the first power input port when the system is receiving power from a power source coupled to the third power input port, and
wherein the second controller is further configured to block power received at the second power input port when the system is receiving power from a power source coupled to the third power input port.
3. The information handling system of claim 1 , wherein the first controller is configured to block power received at the first power input port by toggling a first switch to prevent current from flowing into the system via the first power input port, and wherein the second controller is configured to block power received at the second power input port by toggling a second switch to prevent current from flowing into the system via the second power input port.
4. The information handling system of claim 1 , wherein the first and second power input ports are universal serial bus (USB) type-C ports.
5. The information handling system of claim 1 , wherein a voltage output indicator of the first controller is coupled to a voltage output override indicator of the second controller and a voltage output indicator of the second controller is coupled to a voltage output override indicator of the first controller.
6. The information handling system of claim 5 , wherein the first controller is configured to apply a voltage to the voltage output indicator of the first controller when a power source is detected coupled to the first power input port and to wait a predetermined period of time after applying the voltage before supplying power from the power source coupled to the first power input port to the information handling system.
7. The information handling system of claim 1 , wherein the first and second controllers are further configured to provide a power level to boot one or more power control components of the information handling system, and wherein the first and second controllers are further configured to allow the one or more power control components to control power received at the first power input port and the second power input port after the power control components have booted.
8. The information handling system of claim 1 , wherein the power source coupled to the first power input port comprises a first external power source and wherein the power source coupled to the second power input port comprises a second external power source.
9. A method, comprising:
detecting, by a first controller, a power source coupled to a first power input port;
providing, by the first controller, power from the power source coupled to the first power input port to a charger of an information handling system; and
blocking, by a second controller, power received at a second power input port from entering the system while power is being provided to the information handling system from the power source coupled to first power input port,
wherein the charger of the information handling system is coupled to a power output of the first controller and a power output of the second controller.
10. The method of claim 9 , wherein the step of providing comprises:
applying a voltage to a voltage output indicator of the first controller, coupled to a voltage output override indicator of the second controller; and
allowing power to flow from the power source coupled to the first power input port to the information handling system after a predetermined period of time has passed following the application of voltage to the voltage output indicator.
11. The method of claim 10 , wherein the step of providing further comprises:
detecting a voltage at a voltage output override indicator of the first controller while the voltage is applied to the voltage output indicator of the first controller but prior to the passage of the predetermined period of time;
removing the voltage from the voltage output indicator of the first controller;
waiting a randomized period of time, determined by the first controller; and
re-applying the voltage to the voltage output indicator of the first controller after the randomized period of time has passed.
12. The method of claim 9 , wherein the step of blocking comprises:
detecting, by the second controller, a voltage at a voltage output override indicator of the second controller; and
preventing power received at the second power input port from entering the information handling system via the second controller.
13. The method of claim 9 , further comprising waiting a randomized period of time after detecting the power source at the first power input port prior to applying the voltage to the voltage output indicator.
14. The method of claim 9 , wherein providing power from the first power input port to the information handling system comprises providing a power level to boot one or more power control components of the information handling system, further comprising:
controlling, with the one or more power control components, power received at the first power input port and the second power input port after the power control components have booted.
15. An information handling system, comprising:
a first controller configured to perform steps comprising:
detecting a power source coupled to a first power input port,
directing a second controller, coupled to a second power input port, to block power received at the second power input port from entering the system while power is being provided to the information handling system from the power source coupled to the first power input port, and
providing power from the power source coupled to the first power input port to a charger of the information handling system,
wherein the charger of the information handling system is coupled to a power output of the first controller and a power output of the second controller.
16. The information handling system of claim 15 , wherein the step of directing comprises:
applying a voltage to a voltage output indicator of the first controller, coupled to a voltage output override indicator of the second controller.
17. The information handling system of claim 16 , wherein the first controller is configured to perform steps further comprising:
waiting for a predetermined period of time to elapse after applying the voltage to the voltage output indicator before providing power from the power source coupled to the first power input port to the information handling system.
18. The information handling system of claim 17 , wherein the first controller is configured to perform steps further comprising:
detecting a voltage at a voltage output override indicator of the first controller while the voltage is applied to the voltage output indicator of the first controller but prior to the passage of the predetermined period of time;
removing the voltage from the voltage output indicator of the first controller;
waiting a randomized period of time, determined by the first controller; and
re-applying the voltage to the voltage output indicator of the first controller after the randomized period of time has passed.
19. The information handling system of claim 15 , wherein the first controller is further configured to perform a step of waiting a randomized period of time after detecting the power source coupled to the first power input port prior to directing the second controller to block power received at the second power input port.
20. The information handling system of claim 15 , wherein the step of providing power from the power source coupled to the first power input port to the information handling system comprises providing a power level to boot one or more power control components of the information handling system, and wherein the first controller is further configured to allow the one or more power control components to control power received at the first power input port and the second power input port after the power control components have booted.