Portable computing device for external fuel cell control
The disclosed embodiments relate to the design of a portable and cost-effective fuel cell system for a portable computing device. This fuel cell system includes a fuel cell stack which converts fuel into electrical power. It also includes a fuel source for the fuel cell stack and a controller which controls operation of the fuel cell system. The fuel system also includes an interface to the portable computing device, wherein the interface comprises a power link that provides power to the portable computing device, and a bidirectional communication link that provides bidirectional communication between the portable computing device and the controller for the fuel cell system.
1. A portable computing device configured to control an external fuel cell system, the portable computing device comprising:
a processor;
a memory; and
an interface to the external fuel cell system, wherein the interface comprises,
a power link that provides power from the external fuel cell system to the portable computing device; and
a communication link that provides communication between the portable computing device and a controller for the external fuel cell system;
wherein the memory stores instructions that when executed by the processor cause the portable computing device to:
receive fuel cell state information from the external fuel cell system through the communication link;
send fuel cell control information to the external fuel cell system through the communication link.
2. The portable computing device of claim 1 , wherein the fuel cell state information specifies one or more of the following:
how much power is available from the fuel cell system;
a state-of-charge of an internal rechargeable battery within the fuel cell system.
3. The portable computing device of claim 1 wherein the fuel cell state information specifies one or more of a temperature of the fuel cell stack, a pressure at an inlet of the fuel cell stack, and a pressure at an outlet of the fuel cell stack.
4. The portable computing device of claim 1 wherein the fuel cell state information specifies a cell voltage for one or more cells in the fuel cell stack.
5. The portable computing device of claim 1 wherein the fuel cell state information specifies an amount of fuel remaining in the external fuel cell system.
6. The portable computing device of claim 1 , wherein the fuel cell control information specifies one or more of the following:
a request for a specified amount of power from the fuel cell system;
a fuel cell stack current to be pulled off a fuel cell stack within the fuel cell system.
7. The portable computing device of claim 1 wherein the fuel cell control information specifies a fan speed within the fuel cell system.
8. The portable computing device of claim 7 wherein the fuel cell control information includes a command to run diagnostics for the fuel cell system.
9. The portable computing device of claim 1 , wherein the power link comprises a wireless link.
10. The portable computing device of claim 1 , wherein the communication link comprises a wireless link.
11. The portable computing device of claim 1 , wherein the communication link also communicates:
computing device state information from the portable computing device to the fuel cell system; and
computing device control information from the fuel cell system to the portable computing device.
12. The portable computing device of claim 11 , wherein the computing device state information specifies one or more of the following:
a power requirement for the portable computing device; and
a state-of-charge of a rechargeable battery within the portable computing device.
13. The portable computing device of claim 11 , wherein the computing device control information specifies a power state for the portable computing device, wherein the portable computing device uses the power state to control power usage of components within the portable computing device.