Actuator with stepping motor and auto diffuser using home network for heating, ventilatiing and air conditioning

PURPOSE: An electric-damper actuating unit, an electric diffuser and a cooling and heating system for a heating, ventilating and air-conditioning unit of an apartment house are provided to accurately control a blocking plate by an electric-damper actuating unit, which comprises an electric damper and a stepping motor, to have a given angle. CONSTITUTION: An electric-damper actuating unit for a heating, ventilating and air-conditioning unit of an apartment house comprises a voltage drop circuit(100), a rectifying circuit(200), constant voltage circuits(300), a CPU(400), a motor controlling circuit(500), a electricity storing circuit(600), a stepping-motor driving circuit(700), a manually operating circuit(800), and a remote control circuit(900). The voltage drop circuit lowers 220V AC voltage. The AC voltage lowered by the voltage drop circuit is changed to direct current. The constant voltage circuits comprise a plurality of zeno diodes and a condenser and maintain the current voltage changed by the rectifying circuit to be constant. The IC (U1) of the CPU is driven by the voltages supplied from the constant voltage circuits. The motor controlling circuit controls the stepping motor with the CPU. The electricity storing circuit enables the CPU to smoothly supply the power in case of emergency. The manually operating circuit is manually controlled within a rotating radius of 0-90° in connection with the motor controlling circuit.