Patent ID: 11920816
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Control (Instruments)
Classification: CPC F  G | IPC F  G

Claim 9:
10. A control board of a heating, ventilation, and air conditioning (HVAC) system, comprising:
a microcontroller programmed to control operation of equipment in the HVAC system;
a first power bus configured to receive and transmit first electrical power with first power parameters from a first power source;
a second power bus configured to receive and transmit second electrical power with second power parameters from a second power source, wherein the first power parameters and the second power parameters are different from one another;
a switching device electrically coupled to the first power bus and the second power bus, wherein the switching device is configured to electrically isolate the first power bus and the second power bus;
a switchable input/output (I/O) port communicatively coupled to the microcontroller and configured to couple to the equipment; and
a switchable power bus electrically coupled to the switching device and to the switchable I/O port,
wherein the switching device is configured to:
electrically couple the switchable power bus and the first power bus and electrically isolate the switchable power bus from the second power bus based on a first signal received from the microcontroller; and
electrically couple the switchable power bus and the second power bus and electrically isolate the switchable power bus from the first power bus based on a second signal received from the microcontroller.