| 摘要 |
PURPOSE: To save power consumption without requiring a controlled power source by providing a switching element for switch controlling the switching element of a load circuit by being turned on/off by the output voltage of a photovoltaic element consisting of a solar battery. CONSTITUTION: A solar battery SB consists of an amorphous solar battery. Its sensitivity wavelength ranges 400 to 700 nm and its peak wavelength is near 500 nm, similar to human visual sensitivity characteristics. A switching element SW inverse-serially connects two depression type MOSFETs Q1, Q2 to prevent a current from flowing at the time of off and to control AC. When external light is bright, the output voltage of the battery SB is large and the element SW is kept off, and when external light becomes dark, the element SW is turned on. Both of the drains of the element SW are connected to both terminals T1, T2 of a switch element consisting of a triac Q via a resistor R3, to automatically switch an illumination load L.
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