ERRONEOUSSACTION PREVENTION CIRCUIT FOR AIR CONDITIONER CONTROLLER

摘要

PURPOSE:To effectively remove external noises coming into connection wires by a method wherein connection wires between a CPU and a remote controller are connected through directional lines with a circuit which has a high DC impedance and a low AC impedance. CONSTITUTION:Transfer of signals between a CPU and a remote controller RC is effected through input ports K1, K2, K4, K8 and output ports O7-O4 of the CPU. Based on the detection outputs of sensors (not shown), the CPU feeds preprogrammed control outputs from its ports R1, R2 to relays Ry1, Ry2, so as to control the operations of a compressor motor CM and a fan motor FM. Instruction operating switches S1-S4 of the RC are connected with the ports K1, K2, K4, K8 through diodes D5-D8 and resistors R1-R4. A power source +V is connected with the interconnection points between the diodes and the resistors through diodes D1-D4 respectively.