Method for signal transmission via an electrical power transmission pathway, and signal transmission system using the same

A signal transmission system comprising:

• a switch component and a first choke component that are electrically connected in series, said switch component being used to be electrically connected further to one of a first power wire and a second power wire, receiving a switch control signal, and operating between conduction and non-conduction based on the switch control signal, said first choke component including a first magnetic core, the first and second power wires cooperatively transmitting electrical power;
• a second choke component used to be electrically connected to a load in series, and including a second magnetic core;
• a first conductive path electrically connected between and in series with said first and second choke components;
• a third choke component and a first resonant circuit that are electrically connected in series, and that are electrically and respectively connected further to the other one of the first and second power wires and a first common node of said switch component and said first choke component, said third choke component including a third magnetic core;
• a second conductive path used to be electrically connected between the load and a second common node of said third choke component and said first resonant circuit;
• and
• a first control block electrically connected to said switch component, and generating the switch control signal for receipt by said switch component;
• when controlling said switch component to not conduct, said first control block inducing an induced current that is related to a load control signal for controlling operation of the load, and that flows through at least said first choke component, said first conductive path, said second choke component, said second conductive path and said first resonant circuit;
• wherein each of said first to third magnetic cores has a magnetic hysteresis characteristic corresponding to a magnetic hysteresis curve such that:
• when said switch component does not conduct, the induced current does not cause any of said first to third magnetic cores to reach magnetic saturation;
• and when said switch component conducts, the electrical power provides a current that flows through said switch component, said first choke component, said first conductive path, said second choke component, the load, said second conductive path and said third choke component, and that causes each of said first to third magnetic cores to operate at magnetic saturation.