NOVELTY - A power switching apparatus comprises an alternating current (AC) power supply (1) provided by an electricity plant; a converting power supply (2) connected with the AC power supply; a power switch (3) connected with the converting power supply and an external load (9), respectively; a charger (4) connected with the power switch; at least a natural energy power supply (50) connected with the charger, and generates electric power and supplies electric power to the charger; a voltage sensor (6) connected with the charger; and a battery pack (7) connected with the voltage sensor.    USE - Power switching apparatus for natural energy power supply, i.e. solar energy and wind energy, to supply an alternating current power as a complement to natural energy power supply.    ADVANTAGE - The power switching apparatus switches the power supply to the alternating current power supply when there is not enough power output from the natural energy power supply, insuring reliability of power supply to the load.    DETAILED DESCRIPTION - A power switching apparatus comprises an AC power supply (1) provided by an electricity plant; a converting power supply (2) connected with the AC power supply; a power switch (3) connected with the converting power supply and an external load (9), respectively; a charger connected with the power switch; at least a natural energy power supply (50) connected with the charger, and generates electric power and supplies electric power to the charger; a voltage sensor (6) connected with the charger; and a battery pack (7) connected with the voltage sensor. When a high voltage is sensed by the voltage sensor, the power switch connects the load and the charger. When a low voltage is sensed by the voltage sensor, the power switch connects the load and the converting power supply. When the natural energy power supply supplies electric power, the charger receives the electric power from the natural energy power supply and supplies power to the battery pack so that a high voltage is sensed by the voltage sensor. When the natural energy power supply does not supply any electric power, the battery pack supplies power to the charger so that a high voltage is sensed by the voltage sensor while the charger supplies power from the battery pack to the load by the power switch. When electric energy in the battery pack is exhausted, the voltage sensor senses a low voltage, the converting power supply converts electric power from the alternating current power supply and supplies the converted power to the load by the power switch.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a power switching apparatus for natural energy power supply.    Alternating current power supply (1)    Converting power supply (2)    Power switch (3)    Charger (4)    Voltage sensor (6)    Battery pack (7)    Load (9)    Natural energy power supply (50)