A control circuitry module group (300, 400) for communication between a master control module and at least one slave module in an electrical device and controlling power supply of said at least one slave module, wherein the control circuitry module group (300, 400) comprises: a bus (305, 405); a bus control module (307, 407) coupleable to the master control module and coupled to the bus, and configured to receive a control signal from the master control module, add a target address in the control signal, and send the control signal with the target address to the bus; and at least one slave control module (309, 409) coupled to the bus, each of the at least one slave control module (309, 409) being coupleable to a respective slave module (103, 203, 303) and configured to receive the control signal with the target address via the bus (305, 405) and control power supply for the respective slave module in response to the control signal, wherein: said at least one slave control module (309, 409) comprises a second signal processing unit, configured to generate a power source switching signal based on the control signal, and a power source switching unit, coupled to a power bus (305, 405) connected to said at least one slave control module (309, 409) and configured to switch a connection between the respective slave module and the power bus (305, 405) in response to the power source switching signal, the second signal processing unit is further configured to obtain a feedback signal concerning the respective slave module and provide the feedback signal to the bus control module via the bus (305, 405), the control circuitry module group is a power line carrier communication circuitry, and the bus is configured to allow the communication and implement the power bus (305, 405) between the master control module and the at least one slave control module. a bus (305, 405); a bus control module (307, 407) coupleable to the master control module and coupled to the bus, and configured to receive a control signal from the master control module, add a target address in the control signal, and send the control signal with the target address to the bus; and at least one slave control module (309, 409) coupled to the bus, each of the at least one slave control module (309, 409) being coupleable to a respective slave module (103, 203, 303) and configured to receive the control signal with the target address via the bus (305, 405) and control power supply for the respective slave module in response to the control signal, wherein: said at least one slave control module (309, 409) comprises a second signal processing unit, configured to generate a power source switching signal based on the control signal, and a power source switching unit, coupled to a power bus (305, 405) connected to said at least one slave control module (309, 409) and configured to switch a connection between the respective slave module and the power bus (305, 405) in response to the power source switching signal, the second signal processing unit is further configured to obtain a feedback signal concerning the respective slave module and provide the feedback signal to the bus control module via the bus (305, 405), the control circuitry module group is a power line carrier communication circuitry, and the bus is configured to allow the communication and implement the power bus (305, 405) between the master control module and the at least one slave control module. said at least one slave control module (309, 409) comprises a second signal processing unit, configured to generate a power source switching signal based on the control signal, and a power source switching unit, coupled to a power bus (305, 405) connected to said at least one slave control module (309, 409) and configured to switch a connection between the respective slave module and the power bus (305, 405) in response to the power source switching signal, the second signal processing unit is further configured to obtain a feedback signal concerning the respective slave module and provide the feedback signal to the bus control module via the bus (305, 405), the control circuitry module group is a power line carrier communication circuitry, and the bus is configured to allow the communication and implement the power bus (305, 405) between the master control module and the at least one slave control module.