Patent ID: 8471489

Claim:
A remote power control device comprising a power regulator comprising: a power input line; a primary winding connected to the power input line and wound on a core; a secondary winding, at least part of the secondary winding being in common with the primary winding; at least one tap connected to the primary winding at a predetermined position thereof to specify respective numbers of turns of the primary winding and the secondary winding; at least one switch having one end connected respectively to the at least one tap and another end connected to a common line to change the respective numbers of turns of the primary winding and the secondary winding; and an output line for outputting power that the secondary winding generates as the secondary winding is excited by the primary winding, wherein the respective numbers of turns of both the primary winding and the secondary winding are determined as one of the at least one switch is closed; a sensor unit connected to at least one of the power input line and the power output line of the power regulator to sense at least one of an input power and an output power; and a controller for comparing power sensed by the sensor unit with a preset value and transmitting a control signal for changing output power of the power regulator based on the comparison, wherein the controller uniformly maintains the output power for a first predetermined time required to start a load connected to the power output line, and wherein the controller determines whether the sensed input power is higher than a higher preset value or lower than a lower preset value after the output power is maintained for the first predetermined time, upon determining that the input power is higher than the higher preset value or lower than the lower preset value, the controller decreases or increases the output power, respectively, and uniformly maintains the decreased or increased output power for a second predetermined time, and upon determining that the input power is not higher than the higher preset value and not lower than the lower preset value, the controller uniformly maintains the output power for a third predetermined time.