Samsung Electronics Co., Ltd.

Other

Jong-hwa Cho

Chul-woo Oh

Joong-Gi Kwon

Young-min Chae

Jong-yang Choo

Sang-yong Han

Han-chung Ryu

Sung-jo Jo

Joong-gi Kwon

A high-voltage power supply to output a plus/minus high-voltage, which is applied to image forming apparatuses, includes a plus high-voltage output unit outputting the plus high-voltage by using a Pulse Width Modulation (PWM) signal, a minus high-voltage operation control unit charging a certain voltage while the plus high-voltage output unit is outputting the plus high-voltage, a minus high-voltage output unit outputting the minus high-voltage by using the certain voltage charged in the minus high-voltage operation control unit, and a minus high-voltage blocking unit to block the output of the minus high-voltage from the minus high-voltage output unit while the plus high-voltage output unit is outputting the plus high-voltage.

High voltage power supply and method of outputting plus/minus high-voltage in image forming apparatuses

A constant current-type high-voltage power supply apparatus which is used in an image forming apparatus includes a leakage current detection unit that detects a leakage current leaked from at least one output terminal of the constant current-type high-voltage power supply apparatus and outputs the detected leakage current, a direct current voltage output unit that outputs different direct current (DC) voltages according to whether the leakage current detected by the leakage current detection unit is input, and a power control unit that controls power supply to the constant current-type high-voltage power supply apparatus according to the output DC voltage.

Constant current-type high-voltage power supply apparatus and method of controlling power output from the same

A control and driving device of a high voltage power supply (HVPS) of an electronic apparatus, such as an image forming apparatus, including an input to receive a signal supplied to the HVPS, a control and driving circuit to control and drive the signal received at the input, and an output to output the controlled and driven signal to a transformer of the HVPS, wherein the input, control and driving circuit, and output are integrated into one physical module.

Modular control and driving device and high voltage power supply having the same for image forming apparatus

A power supply apparatus, an apparatus, and a method of supplying power are provided. The power supply apparatus including a high voltage generating unit, which generates one or more output voltages by using an input voltage, and which is implemented as a chip. The one or more output terminals are on a same circuit board as the high voltage generating unit, to output the generated one or more output voltages. The chip includes a transforming unit to transform the input voltage into one or more transformed voltages that are different from one another, and a rectifying unit to rectify the transformed voltages into rectified voltages, and to determine the rectified voltages as the generated one or more output voltages.

Power supply apparatus and method of supplying power

A high voltage power supply apparatus comprising a first circuit disposed on a prepared substrate, and for receiving a first voltage and generating a second voltage that is previously set according to the first voltage, and a second circuit for amplifying and rectifying the second voltage to generate a plurality of high voltage signals, wherein the first circuit and the second circuit are embodied as a single module, wherein at least a portion of the single module is surrounded by an insulator.

High voltage power supply apparatus

In a provided power supply unit, a plurality of circuit elements are integrated into a chip, wherein the circuit elements generate one or more output voltages by using an input voltage. Thus, although the number of voltages, which can be generated by the power supply apparatus, is remarkably large, the power supply apparatus can be miniaturized. In addition, an apparatus, in which the power supply apparatus is installed, can be miniaturized.

Power supply apparatus

A high voltage power controlling apparatus of an image forming apparatus including a DC (direct current) power controller to convert and output a first PWM (pulse width modulation) signal provided from an engine controller into a switching waveform signal, a first voltage transformer to transform the switching waveform signal output from the DC power controller, a rectifier to rectify output power transformed by the first voltage transformer into DC power, first through N(where N is a positive integer greater than one) DC supplies to adjust and output the DC power rectified by the rectifier such that the DC power is adjusted to a predetermined level, first through N AC (alternating current) power controllers to convert and output a second PWM signal provided from the engine controller into switching waveform signals, and second through N+1 voltage transformer to transform the switching waveform signals output from the first through N AC power controllers, to overlap the transformed powers with the DC powers having predetermined levels of the first through N DC supplies, and to output the overlapped powers to first through N developers, respectively.

High voltage power controlling apparatus of image forming apparatus and method thereof

An apparatus to generate a high voltage includes a switching part to control a voltage induced in a secondary coil of a power transforming part, by interrupting a current in a primary coil of the power transforming part, a digital controlling part to control the interruption operation of the switching part according to supplied control data. The switching part, the digital interfacing part and the digital controlling part may be embodied in an ASIC chip (application-specific integrated circuit). An optimum control according to an output state of the apparatus is easily achieved, manufacturing time for tuning each parameter is reduced and heat generation in the apparatus is reduced.

Apparatus to generate high voltage by digital control and method thereof

A high voltage power supply includes a current overflow prevention unit to detect a change in a load of a device that is operated by an output power supplied from a transformer and to ground filtered signals that are input to first and second comparison units according to the detection result.

High voltage power supply

A high voltage power controlling apparatus of an image forming apparatus includes a DC (direct current) power controller connected to a plurality of DC supplies to output DC power at respective predetermined levels. A plurality of AC (alternating current) power controllers control output AC power to overlap the power output from the DC supplies, respectively.

High voltage power controlling apparatus of image forming apparatus including multiple DC power supplies

A power supply control apparatus and method are provided. The apparatus includes a controller outputting a first pulse width modulation (PWM) signal for supplying an electric power and a second PWM signal to be compared to the first PWM signal, a first PWM signal input unit converting the second PWM signal to a direct current (DC) signal, a second PWM signal input unit receiving the converted second PWM signal, a comparator comparing the first PWM signal and the converted second PWM signal, a switching unit generating a waveform having a voltage according to the comparison result of the comparator, a transformer transforming the voltage of the generated pulse waveform according to the switching result of the switching unit and a rectifier and voltage divider for rectifying and voltage-dividing the transforming result of the transformer, wherein the controller adjusts the second PWM signal by receiving the rectifying and voltage-dividing result of the rectifier & voltage divider.

Power supply control apparatus and method of using the same

Provided is a high voltage power supply which includes a controller to provide a PWM signal and a power signal, an input unit to receive the PWM signal provided from the controller, a comparison unit to control output of the power signal supplied from the controller by comparing a signal filtered to a DC voltage by the input unit to a voltage reference signal, a transformation unit to transform the power signal output from the comparison unit, and a rectification unit to rectify the signal output by the transformation unit, wherein the high voltage power supply further includes a power input delay unit to delay the supply of the power signal to the comparison unit by a predetermined time from when the power supplied from the controller for input into the comparison unit. The high voltage power supply can prevent components of a device from being damaged due to sudden voltage surge in an output power output from an output terminal, which can occur when a time at which a PWM signal is transitioned to a HIGH state. The power signal is delayed with respect to a time at which a high voltage driving power 24 [V] is initially supplied.

An analog control application specific integrated circuit (ASIC) apparatus for a high voltage power supply (HVPS) in an image for apparatus, and a method for controlling the HVPS are provided. The HVPS includes a transformer transforming an AC signal to a high voltage signal and a voltage doubler outputting a DC high voltage for the HVPS. The ASIC includes an analog control circuit configured as a one-chip ASIC that converts a predetermined DC level signal to a high frequency switching signal using a switching component and outputs the converted high frequency switching signal to a primary winding of the transformer. If the high voltage output signal output from the voltage doubler is not feedbacked, the switching component high frequency switches a received driving signal of a gate driver, and outputs the high frequency switched signal to the transformer.

Growing community of inventors

Suwon-si, South Korea

Jong-hwa Cho