Samsung Electronics Co., Ltd.

Han-chung Ryu

Jong-yang Choo

Jong-hwa Cho

Joong-gi Kwon

A scanning apparatus having a cold cathode fluorescent lamp includes a central processing unit (CPU) controlling a scan unit to be in one of the stand-by mode, a scan mode and a sleep mode and outputting a PWM signal having a variable duty ratio based on an operation mode of the scan unit; a filter unit receiving the PWM signal from the CPU, filtering the PWM signal, and outputting the filtered signal; a feedback unit detecting the voltage applied to the fluorescent lamp and outputting a feedback signal; a controlling unit controlling the illumination of the fluorescent lamp based on the voltage input from the feedback unit, the controlling unit outputting a control signal variably controlling the voltage applied to the fluorescent lamp depending on the filtered signal; and a lamp drive unit applying variable AC voltage to the fluorescent lamp based on the control signal, thereby driving the fluorescent lamp. Accordingly, it is possible to control the luminous-intensity of the fluorescent lamp, reduce preheating time of the fluorescent lamp, extending the fluorescent lamp's lifetime, and lowering the power consumption.

Scanning apparatus having a fluorescent lamp and control method thereof

A power supplying apparatus having a power saving function and a method of supplying power with a power saving function. An auxiliary power generator generates auxiliary power in response to a cutoff signal. A main power generator senses the generation of the auxiliary power and generates main power in response to the sensed result and a first state of a control signal supplied by a set which performs an intrinsic function. Absent the power cutoff signal, the set performs the intrinsic function in response to the main power and stands by to perform the intrinsic function in response to the auxiliary power. A second state of the control signal places the power supplying apparatus in a power saving mode during which the set may communicate with another circuit. If the cutoff signal is supplied during performance of the intrinsic function, main power is sustained until the intrinsic function is completed.

Apparatus for and method of supplying power with power saving function

An apparatus for and a method of controlling a power supply for a printer. A power on signal is automatically provided to turn on the printer power supply in accordance with a predetermined printing command, and a power off signal to turn off the printer power supply is automatically provided when the printer has not performed a printing operation for a predetermined time period. A low voltage and current switch is provided for manual on/off control of the printer power supply in accordance with an operation of a user. If the printer power supply in off, operation of the switch generates the power on signal. If the printer power supply is on, operation of the switch causes the controller to generate the power off signal to turn off the printer power supply.

Apparatus for controlling power supply to printer and method thereof

A voltage converting method and a voltage converting apparatus using a large electrolytic condenser are provided. In the method according to an embodiment of the invention, when the level of an input alternating voltage is equal to or greater than a first predetermined level and smaller than a second predetermined level that is smaller than the first predetermined level, the input alternating voltage is rectified to produce an output direct voltage. When the level of the input alternating voltage is equal to or greater than the second predetermined level, the rectification of the input alternating voltage is stopped. Thereafter, if the provision of the input alternating voltage is stopped and then resumed, the production of the output direct voltage is resumed. Accordingly, the large electrolytic condenser can be protected without physically destroying any device, and the output direct voltage can be immediately produced from the input alternating voltage when the level of the input alternating voltage returns to its normal state. Thus, the production of the output direct voltage is simplified, and unnecessary repair costs are avoided. Also, the cause of inrush current that can be introduced into the large electrolytic condenser is advantageously removed.

Voltage converting method and voltage converting apparatus using large electrolytic condenser

An apparatus for controlling power and reducing power consumption in a system including a switching mode power supply. (SMPS), and a method thereof. The apparatus includes a switch that is set to an ON state when a user contacts the switch, a detection portion connected in parallel with the switch and detecting whether a signal for requiring a predetermined operation is applied to the system from outside, and a power supply portion supplying the power to each part in a system when the switch is set to the ON state or the signal is input from the detection portion. The power supply portion terminates the power to each part in the system including the system controller when a power off signal is applied from the system controller when the switch is set to an OFF state and when signal is not input from the detection portion.

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Gyeonggi-do, South Korea

Han-chung Ryu