| 摘要 |
PURPOSE:To use the priority controlling circuit of a solid-state relay suitably for the forward/backward switching circuit of a motor, etc., by providing the 1st and the 2nd priority control switching transistors (TR) and the 1st and the 2nd clamping TRs, and controlling which of two solid-state relays is used preferentially. CONSTITUTION:The solid-state relays 11 and 12 have input and output terminals insulated by a photocoupler 22 and priority control switching circuits 41 and 43 are inserted in series between the LED23 of the coupler 22 and driving input terminals 16 and 17. Further, clamping TRs 42 and 44 are connected in parallel to the LEDs 23 of the couplers 22 of the relays 42 and 44; and the clamping TR44 for the relay 12 is driven by the on output of the circuit 41 for the relay 11, and the TR42 for the relay 11 is driven by the on output of the circuit 43 for the relay 12. |
