Samsung Electronics Co., Ltd.

S-printing Solution Co., Ltd.

Kyung-hwan So

Jin-ha Kim

An-sik Jeong

Young-jun Song

Jae-wan Kim

Hong-ki Jung

A switching mode power supply (SMPS) includes a rectifier to rectify an alternating current (AC) voltage; a first transformer to convert the rectified voltage into a first output voltage of the SMPS according to a switching operation of a first switching unit; a second transformer to convert the rectified voltage into a second output voltage of the SMPS according to a switching operation of a second switching unit; first and second switching control units to control the switching operations of the first and second switching units; a power blocking unit to block power supply according to a light signal. The power blocking unit is electrically insulated from the light emitting unit.

Switching mode power supply

A phase detector includes an alternating current input unit to which input power is applied; a zero cross generator that outputs a zero cross signal at a zero cross point of the input power by using a photo coupler; and a zero cross detector that converts the zero cross signal to a pulse signal and detects the phase of the input power based on the pulse signal. A compensation capacitor is connected in parallel at a first side of the photo coupler.

Method and apparatus for detecting phase of input power

A switching mode power supply (SMPS) and a power supply method using the SMPS, the SMPS including: a rectifier to rectify an alternating current (AC) voltage; a first switching unit to switch the voltage rectified by the rectifier; a first switching control unit to control the first switching unit; and a power blocking unit to block power supply to the first switching control unit in a power saving mode.

Switching mode power supply and power supply method using the same

A fixing unit controlling apparatus that includes a switching unit of a power supplier to supply power to a fixing unit according to a power supply controlling signal to control a temperature of the fixing unit, and a switching unit of a power shutter to shut off power supplied to the fixing unit when the fixing unit controlling apparatus operates abnormally, wherein the switching units of the power supplier and the power shutter are both connected to a snubber circuit of the power shutter.

Fixing unit controlling apparatus and image forming apparatus including the same

An apparatus to protect a half or full bridge circuit including a first switching unit and a second switching unit in an image forming apparatus performing induction heating, the apparatus including a switching control unit to control operations of the first switching unit and the second switching unit by generating and outputting a first driving signal to turn on or off the first switching unit and a second driving signal to turn on or off the second switching unit; and an arm-short detecting unit to output a disable signal to stop operation of the switching control unit in response to the first driving signal and the second driving signal simultaneously being signals to turn on the first switching unit and the second switching unit.

Apparatus and method to protect half or full bridge circuit including first switching unit and second switching unit in image forming apparatus performing induction heating

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Seoul, South Korea

Kyung-hwan So