| 摘要 |
PURPOSE:To make it needless to specially supply a control power from outside and to make a transformer for power supply unnecessary by using light energy and energy obtained from a DC power source as the energy in a commutation circuit. CONSTITUTION:With the ignition of a first optical element 5 by the light energy, the DC current is supplied from a DC power source 1 to a load 12 and the energy from the DC power source 1 is accumulated in an energy accumulation means 6 in the commutation circuit Cc. When a second optical element 9 is ignited with the light energy, the energy stored in the energy accumulation means 6 flows to the first optical element 5 as an opposite direction current so as to break the first optical element 5 and the power supply from the DC power source 1 to the load 12 are broken. Thus, it is not needless to supply the control power and the transformer is not needed, so that the stray electrostatic capacity is reduced. |
