| 摘要 |
<p>PURPOSE:To unnecessitate the use of an insulating transformer, etc., and to reduce the number of parts for a power cut-off circuit by realizing a power cut-off function in a small packing space and with a small number of parts and also securing an electrically insulated state among a power control circuit, a DC stabilized power circuit, and a power load part. CONSTITUTION:In a power control circuit 6A, a power command circuit 61A containing the light emitting part of an optically coupled element and the light receiving part of an optical thyristor 68 connected in parallel to each other is connected to a power supply circuit 60A which generates the DC power from a primary power supply 8. Then the circuit 6A supplies a cut-off command signal Sp to the light emitting part of the thyristor 68 and at the same time uses the signal obtained from the light receiving part of the optically coupled element as a stop control signal of a DC stabilized power circuit 2A.</p> |
