Abstract: Provided is a method for predicting and managing the temperature of an electronic circuit, which can trigger an alarm, block, or control by predicting in advance a temperature rise result due to heat before heat generation of the electronic circuit and components increases up to a risk level. The temperature prediction and management method is a method for predicting and managing the temperature of an electrical circuit unit including one or more circuits or components including: a detection unit for predicting and managing the heat of the electrical circuit unit; and a control/alarm unit for providing control or an alarm to the electrical circuit unit according to the operation of the detection unit, wherein the electrical circuit unit includes one or more thermistors, and the detection unit senses whether or not the electrical circuit unit is abnormally heated.

Abstract: A power control method using AC power, the method being capable of performing: low power control that passes only two portions of positive direction waves of each one-cycle sine wave of the AC power and only two portions of negative direction waves of each one-cycle sine wave of the AC power, which have voltage levels lower than a set reference voltage level, through a system; and high power control that does not pass only two portions of positive direction waves of each one-cycle sine wave of the AC power and only two portions of negative direction waves of each one-cycle sine wave of the AC power, which have voltage levels lower than a set reference voltage level, through the system.

Abstract: A method of driving a fluorescent light, having: (a) receiving and full-wave rectifying commercial AC power; (b) dividing phases of the AC power full-wave rectified at step (a) depending on voltage magnitude, and performing switching control such that low-voltage portions of the divided voltages, having low phases, are used as heating power for heating filaments of a fluorescent tube, and high-voltage portions of the divided voltages, having high phases, are used as discharge voltage of the fluorescent tube; (c) switching on the low-voltage portions having low phases as the heating power for heating the filaments of the fluorescent tube in response to a signal output at step (b); and (d) switching on the high-voltage portions having high phases as the lighting power of the fluorescent tube in response to the signal output at step (b).

Abstract: A method of driving a fluorescent light, having: (a) receiving and full-wave rectifying commercial AC power; (b) dividing phases of the AC power full-wave rectified at step (a) depending on voltage magnitude, and performing switching control such that low-voltage portions of the divided voltages, having low phases, are used as heating power for heating filaments of a fluorescent tube, and high-voltage portions of the divided voltages, having high phases, are used as discharge voltage of the fluorescent tube; (c) switching on the low-voltage portions having low phases as the heating power for heating the filaments of the fluorescent tube in response to a signal output at step (b); and (d) switching on the high-voltage portions having high phases as the lighting power of the fluorescent tube in response to the signal output at step (b).

Abstract: A power control method using AC power, the method being capable of performing: low power control that passes only two portions of positive direction waves of each one-cycle sine wave of the AC power and only two portions of negative direction waves of each one-cycle sine wave of the AC power, which have voltage levels lower than a set reference voltage level, through a system; and high power control that does not pass only two portions of positive direction waves of each one-cycle sine wave of the AC power and only two portions of negative direction waves of each one-cycle sine wave of the AC power, which have voltage levels lower than a set reference voltage level, through the system.

Abstract: An outer and inner diameter measuring method for a transparent tube in a non-contact manner includes the steps of irradiating a light having a linear sectional shape, inclined at a pre-determined angle with respect to a plane perpendicular to a length direction of a transparent tube, to the transparent tube; obtaining a light beam pattern formed since the light having a linear sectional shape is intercepted and refracted by the tube; obtaining an inner diameter of the tube by extracting inner diameter information of the tube from the obtained light beam pattern; and obtaining an outer diameter from a light beam pattern refracted by the tube, thereby calculating the outer and inner diameters together.

Abstract: A method of controlling low voltage using a waveform of Alternating Current (AC) power, including; a full wave rectification step of fill-wave-rectifying input AC power; a switching step of performing a switching operation to generate four power outputs, whose voltage level is lower than that of set control voltage, in one cycle of the full-wave rectified AC power in such a way as to switch on low voltage portions of a waveform of the full-wave-rectified AC power whose voltage levels are lower than that of the set control power and switch off high voltage portions whose voltage levels are higher than that of the set control power; and an AC power output step of converting the low voltage portions, which are output at the switching step, into Direct Current (DC) voltage and outputting the DC voltage.