A power monitoring circuit having an automatic feedback function and an overload protection function is described. The method includes: obtaining storage addresses of packets in each queue, and dequeuing, by multiple dequeue processing engines, the packets in each queue in parallel according to the storage addresses of the packets in each queue. A difference between the first and second moving averages is calculated as a detection result of the target carrier wave. The inlet chambers and the overflow chambers being adapted to be pressed against each other respectively. A control module generates control signals to change states of the switches to alternate a direction in which the current flows through the load. The intelligent connector is a data structure that contains the name of a variable transported by that connector, an address of the variable itself as a value in memory, and further information of the device producing the variable, at least in the form of address or pointer to the device data structure and the addresses of all other devices consuming that variable.