Abstract: A method of controlling an operating voltage of an electrical system for supplying electrical power to a load and an electrical system for supplying electrical power to a load are described herein. The method comprises charging an energy storage unit using electrical power at a predetermined voltage, wherein the energy storage unit comprises a capacitor; removing the operating voltage; and discharging the energy storage unit across a fixed load. The method further comprises monitoring a discharge voltage across the fixed load over a period of time; determining a time constant of the energy storage unit based on the monitored discharge voltage; and comparing the time constant to a threshold value. If the time constant is higher than the threshold value, the method comprises decreasing the operating voltage. If the time constant is lower than the threshold value, the method comprises increasing the operating voltage.

Abstract: A controller area network (CAN) device arranged to communicate on a CAN bus, the device comprising a processor, a CAN controller, a CAN transceiver and a termination resistor and switch assembly, the termination resistor and switch assembly comprising a switch and a first termination resistor and a second termination resistor for connection, respectively, between the device and a first line and a second line of the CAN bus, the switch comprising a dual opto-coupled solid-state relay, between the first termination resistor and the second termination resistor, and a split termination capacitor connected at a mid-point between the first termination resistor and the second termination resistor and ground, whereby the switch is controlled by a termination enable signal from the device processor to switch in or switch out the first and second termination resistors according to a position of the device on the CAN bus.