Method for loading power to bus by air conditioning controller and controller

The invention relates to a method for loading power to a bus by an air conditioning controller. The method comprises the following steps that: a) a voltage detection module detects the voltage of the bus and transmits a detection signal to a singlechip; b) the singlechip judges whether the power has been loaded on the bus or not according to the detection signal of the voltage detection module; and if so, the singlechip returns to the step a), and otherwise, the singlechip controls a power loading module to load the power to the bus; and c) an over-current detection module detects the currentof the bus and transmits the detection signal to the singlechip; and d) the singlechip judges whether over-current exists on the bus or not according to the detection signal of the over-current detection module; and if so, the singlechip controls the power loading module to cut off the loading of power to the bus by the controller and returns to the step a). The invention also discloses a controller and a supplementary co