Patent ID: 7839115

Claim:
A power switching apparatus for natural energy power supply comprising: a AC power supply provided by an electricity plant; a converting power supply connected with the AC power supply; a power switch, connected with the converting power supply and an external load respectively; a charger, connected with the power switch; at least a natural energy power supply, connected with the charger, configured for generating electric power and supplying the electric power to the charger; a voltage sensor connected with the charger, wherein when a high voltage is sensed by the voltage sensor, the power switch is set to connect the load and the charger and when a low voltage is sensed by the voltage sensor, the power switch is set to connect the load and the converting power supply; a battery pack connected with the voltage sensor, wherein 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; and a light sensing switch, the light sensing switch being disposed on a circuit by which the AC power supply supplies power to the load via the converting power supply and the power switch, and being configured to close the circuit when no light is sensed by the light sensing switch and to open the circuit when light is sensed by the light sensing switch.