Disclosed is an inverter assembly without galvanic isolation, the inverter assembly including a PCB mounted with a power supply circuit unit, an inverter unit, an analogue circuit unit and a controller, a first ground circuit pattern to supply a ground power to the power supply circuit unit and the inverter unit, a second ground circuit pattern to supply the ground power to the analogue circuit unit, a third ground circuit pattern to supply the ground power to the controller, a first bead between the first ground circuit pattern and the second ground circuit pattern to isolate an impedance between the first ground circuit pattern and the second ground circuit pattern, and a second bead between the second ground circuit pattern and the third ground circuit pattern to isolate an impedance between the second ground circuit pattern and the third ground circuit pattern.