baber/WOPTO huggingface dataset:
Patent KR-20000038618-A (KR)
Title: Video free amplifier circuit for display system
Inventor: BANG JEONG HO
IPC: G09G1/16
Filed: 1998-12-08
Abstract: PURPOSE: A video free amplifier circuit for a display system is provided to improve the brightness of the display system by employing a brightness difference compensating circuit within the video free amplifier circuit. CONSTITUTION: A video free amplifier circuit for a display system includes a digital controller(210) for outputting adjusting signal according to a control signal from the microprocessor(10) and a brightness difference compensating circuit(230) for outputting a brightness difference correction signal according to the output signal from the digital controller(210). The output signals of the digital controller(210) and the brightness difference compensating circuit(230) are input to a contrast adjusting part(22) for adjusting an output level of a video signal of the video free amplifier circuit(200).
Patent KR-19990062909-A (KR)
IPC: C07C29/141
Filed: 1998-12-09
Abstract: Nitrogen-containing bases are added to the aldehyde starting material in a process for the production of alcohols by gas-phase hydrogenation of aldehydes in presence of a hydrogenation catalyst.
Patent KR-20000038902-A (KR)
Title: Reinforced prefabricated windows and doors frame assembly
Inventor: KIM JIN GOUN
IPC: E06B3/70
Filed: 1998-12-07
Abstract: PURPOSE: A reinforced prefabricated windows and doors frame assembly is provided to strengthen stiffness and to obtain both advantage of wood and easiness in assembling aluminum extruded material by improving disadvantages of a general aluminum extruded windows and doors or wood windows and doors. CONSTITUTION: An aluminum frame part(A) facing outdoors fixed in a reinforced frame part(S) inserted to a reinforced material insertion channel(3) of a wood frame part(W) is extruded and a pair of fixed ribs(10,11) are formed to face indoors. The entire part of the wood frame embedding the reinforced frame part is received between the fixed ribs and combined by a fixing piece such as a fixing screw. A finishing protruded part for finishing by receiving a roller is formed integrally with a crosswise frame of the aluminum frame part. Even if whole loads are fed to the reinforced frame part concentrically, the stiff reinforced frame part is not deformed. Thereby, the stiffness of the entire of the windows and doors is strengthened.
Patent KR-19990063103-A (KR)
Title: 유기박막 el 디바이스 및 그 제조방법
IPC: H01L51/50
Filed: 1998-12-16
Abstract: 자외선 조사에 대해 상이한 경화조건을 갖는 접착제의 조합으로 구성되는 자외선 경화 접착제에 의해 접착된 투명절연기판 및 밀봉용 캡을 구비한 유기박막 EL (Electroluminescence) 디바이스가 개시된다.     또한, 투명절연기판과 밀봉용 캡 사이에 자외선 조사에 대해 상이한 경화조건을 갖는 다수의 자외선 경화 접착제를 배치하는 공정  및  상이한 조사조건을 갖는 자외선조사를 다수의 자외선 경화 접착제에 대해 다단계로 실시하여 상이한 경화조건을 가진 접착제들이 각 단계에서 개별적으로 경화되도록 하는 공정을 구비하는, 자외선 경화 접착제에 의해 접착되는 투명절연기판과 밀봉용 캡으로 구성되는 유기박막 EL 디바이스의 제조방법도 개시된다.
Patent KR-20000039991-A (KR)
Title: Apparatus for sharing data between portable communication terminal and personal computer
Inventor: PARK SEONG KOO
IPC: H04B1/38
Filed: 1998-12-16
Abstract: PURPOSE: An apparatus for sharing data between a portable communication terminal and a personal computer is provided so that not only can the battery of a portable communication terminal be charged by the power supplied from a PC, but various information exchange can be achieved through data communication between the portable communication terminal and the PC, by connecting the coupling port of the portable communication terminal to the communication port of the PC. CONSTITUTION: A mounting stand(1) is formed of a mounting slot(11) of a shape to enclose the lower portion of a portable communication terminal(2). A connector(4) comprising a data transmitting and receiving terminal and a power supply terminal is coupled with a coupling port(21) of the portable communication terminal(2), so as to be inserted and ejected. An interface cable(5) performs functions to transfer information inside of the portable communication terminal(2) and a PC(3) and to supply external electricity to the battery of the portable communication terminal(2).
Patent KR-20000042054-A (KR)
Title: Method for scouring high pure steel of aluminum deoxidation
Inventor: KIM JEONG SIK
IPC: C21C7/00
Filed: 1998-12-24
Abstract: PURPOSE: A method for producing a high pure steel is provided to shaping-control from an existing inclusion as a single alumina to an inclusion of calcium aluminum type by inputting a flux powder of quick lime group in a steel deoxidized with an aluminum and to return through a bubbling process without an RH process. CONSTITUTION: A steel is scoured in a converter with a common method and is ejected in a ladle. In inserting an aluminum deoxidizing agent, a dissolved oxygen is generated in an alumina inclusion and the steel is deoxidized. A lance(6) is deposited on the steel(2) inside the ladle(1) by falling. A flux powder of quick lime group is included through the lance(6). The purity of steel is secured by shaping-control the alumina inclusion inside the steel into a calcium aluminate to be easily floated. The inclusion is removed by returning with bubbling the steel. The bubbling is performed with a non-volatile gas(argon) to smoothly return the steel. The bubbling is performed under a flux of 0.5-1.0Nm/min and a pressure of 5.0-1.0kg/cm¬2 per one tone of steel.
Patent KR-20000010512-A (KR)
Title: Touch panel input apparatus
Inventor: MAEDA DOSIHUMI
IPC: G06F3/041
Filed: 1998-12-30
Abstract: PURPOSE: A touch panel input apparatus is to input pressure location with a light operation pressure, such as finger, pen, etc., and to improve a transmissivity and visibility by injecting a transparent liquid between transparent plates. CONSTITUTION: A touch panel input apparatus consists of: an upper transparent plate(2) and a lower transparent substrate(3), wherein a movable electric conductor layer(4) and a fixed electric conductor layer(5) are formed respectively; a seal part(10), which makes a narrow gap(d) between the movable electric conductor layer and the fixed electric conductor layer closely attached to the upper transparent plate(2) and the lower transparent substrate(3) so as to accumulatively lay and support; and a transparent insulation liquid(11), which is injected between the upper transparent plate(2) and the lower transparent substrate(3) sealed by the seal part(10).
Patent KR-20000044091-A (KR)
Title: Structure of wedge for window frame molding of bus
Inventor: SON SEUNG HUI
IPC: B60J1/00
Filed: 1998-12-30
Abstract: PURPOSE: A structure of a wedge for a window frame molding of a bus is provided to improve the appearance of a bus and to prevent noise flowed into a bus via a gap by forming a soundproof end integrally to one end of a wedge inserted to an insertion support groove of a molding member. CONSTITUTION: A window frame(20) is fixed by a screw(60) via a combining hole(31a) of a molding member(30) formed integrally with a hollow hoe(51) of a packing(50) and the window frame in the outer side of a side pillar(10). A wedge(40) is inserted to an insertion support groove(31) formed on the molding member of the window frame. Both ends of a hanging piece(41) of the wedge formed integrally with a hanging sill(32) formed on the inner part of the insertion support groove are inserted closely. A close adhesion part(42) of the wedge is adhered closely to the outer face of a protruded end(33) protruded on the lower end of the molding member. A soundproof end(43) formed on the front end of the close adhesion part closes a gap(H) formed to be curved between the side pillar and the molding member. Thereby, a window frame molding structure of a bus is assembled completely.
Patent KR-19990028834-A (KR)
Title: 비디오 재생 자동화 장치
IPC: G11B33/10
Filed: 1996-07-08
Abstract: 비디오 기록 및 재생 장치는 비디오 프로그램과 함께 테이프 또는 다른 기록 매체상에 기록된 타이밍 엣지를 포함하는 제어 트랙 신호를 기록하는 제어 트랙 레코더를 구비한다.  타임 엣지는 재생시 타이밍 회로를 동작시키기 위한 최소 기울기의 상승 엣지를 가지며, 이 타이밍 회로는 하강 구간에 응답하지 않는다.  디코더는 제어 트랙 신호, 및 재생 기능으로서의 감기 재생 모드, 감기 스킵 모드 및 재감기 모드 중에서 하나로 전환시키는 테이프 드라이브에 결합되고, 스킵 및 재감기 코드는 최소 이하로 상승 구간이 기울어진 펄스로서 제어 트랙에 삽입되어 타이밍 엣지와는 구별된다.  펄스는 재생, 스킵 및 재감기 코맨드를 디지탈적으로 엔코딩하고, 또한 재생 코드 보다 앞에 그리고 재감기 코드 다음에 오는 세그먼트에 대한 반복 횟수를 엔코딩한다.  이 장치는 메뉴 스크린을 통해 유저에 의해 선택되는 코드를 기존 코드에 덮어쓰기 하므로써 유저가 재생, 스킵 및 재감기 코드 및 다수 재생 횟수를 편집할 수 있다.
Patent KR-19990064174-A (KR)
Title: 편물기계, 특히 정경편물기계
IPC: D04B27/26
Filed: 1996-10-04
Abstract: 편물기계는 바늘 열의 적어도 하나 이상을 위한 메인 드라이브(16)와 생산될 니트웨어의 특징들을 세우기 위해 입력 장치(122)를 가지는 중앙 제어 유닛(120)을 구비한다. 제어를 개선하기 위하여, 개개의 구성부(15,22,32,34,44a,44b,44c,44d)의 각 드라이브(16,28,33,35,63a,63b,63c,63d)는 제어 장치(120)의 관련 프로그램 모듈을 나타내고 처리하기 위해 개개의 정보처리기능을 가진 제어 유닛(16 3 , 28 3 , 33 3 , 35 3 , 63a 3 , 63b 3 , 63c 3 , 63d 3 )을 구비한다. 드라이브들은 공용 기준 밸류 비트 생성프로그램 회선(130)을 통하여 상호연결되고 그리고 동기화되며, 여기서 하나의 드라이브(16)는 메인 드라이브이고 적합한 비트 생성프로그램(16 4 )은 기준 밸류 비트 생성프로그램이다.
Patent KR-20000064287-A (KR)
Title: 엠어리 주파수 편이 방식 수신기
IPC: H04L27/14
Filed: 1997-06-23
Abstract: 본 발명은, 주파수 다운 변환된 신호가 심벌 반복 코딩을 갖는 M-ary DPSK로 처리되는, M-ary FSK 수신기에 관한 것이다. 주파수 복조기(20)의 출력은 최적으로 선택된 시간 간격에 대해 적분되는데(22), 상기 시간 간격은 심벌 당 N 개의 위상 변화 추정값을 얻기 위한 심벌 간격의 한 조각이다. 이들 N개의 서브 심벌은 대응하는 소프트 결정을 얻기 위해 처리되고(24,26), 이후 M-ary 심벌을 포함하는 각 비트에 대해 전체적인 소프트 결정을 제공하기 위해 한 심벌 주기(또는 이들의 실질적인 조각)에 대해 합산된다(32, 34). 이들 출력은 순방향 에러 정정을 위한 소프트 결정으로 직접 사용되거나, 또는 하드 결정을 얻기 위한 임계 회로에 인가된다.
Patent KR-19990071878-A (KR)
Title: 기판 벨트 연마기
IPC: B24B37/20
Filed: 1996-12-05
Abstract: 본 발명은 화학기계식 연마 공정으로 연마되는 반도체 웨이퍼(52)와 같은 기판에 대항하는 가요성 멤브레인 연마 벨트(60)에 관한 것이다.  유체층(74)이 연마되도록 연마 헤드(40)에 유지되어 있는 기판(52)을 향해 연마 멤브레인(60)을 미는 연마 부재 백킹 조립체의 표면에 제공되어 있다.  벨트(60)의 선형 운동은 벨트의 전체 폭을 따라 균일한 연마를 제공하며, 화학기계식 연마를 이루어질 가능성을 제공한다.  기판 표면의 단지 작은 면적만이 연마 멤브레인과 접촉하지만, 기판에 대한 캐리어의 운동은 기판(52)의 전체 면적을 균일하게 연마하도록 프로그램된다.
Patent KR-19990082541-A (KR)
IPC: A61K31/00
Filed: 1997-02-12
Abstract: PCT No. PCT/EP97/00628 Sec. 371 Date Jun. 29, 1998 Sec. 102(e) Date Jun. 29, 1998 PCT Filed Feb. 12, 1997 PCT Pub. No. WO97/30078 PCT Pub. Date Aug. 21, 1997Mono- or di-substituted derivatives of GE2270 factors C2a, D2 and E of general formula (I), wherein W represents a moiety of formula (a), (b) or (c), R1 and R2 representing a variety of substituents, X1 is methyl, X2 is a -CH2-W1 moiety and X3 is methylamino or amino, or X1 is a -CH2-W1 moiety, X2 is methoxymethylene and X3 is methylamino, with the proviso that when X3 is amino, then W must be 2-(aminocarbonyl)-pyrrolidinyl; with the further proviso that when W is 2-(aminocarbonyl)-pyrrolidinyl, then W1 cannot be hydroxy; and the pharmaceutically acceptable salts thereof. The mono- or di-substituted derivatives of antibiotic GE 2270 of formula (I) are antimicrobial agents mainly active against gram positive bacteria.
Patent KR-19990067834-A (KR)
Title: 형광 표시관의 배기 장치
IPC: H01J9/40
Filed: 1999-01-11
Abstract: 형광 표시관의 배기 장치에 있어서, 형광 표시관(2)의 배기 구멍(8)의 밀봉시에 덮개 부재(60)를 항상 안정된 위치에 유지하고 일정한 가압력으로 배기 구멍(8)을 밀봉한다. 
     배기 구멍(8)에 가해지는 덮개 부재(60)의 가압력에 상당하는 추(59)와, 이 추(59)를 이송하는 데 걸림돌이나 스틱 슬립 현상을 일으키지 않고 이동시켜 덮개 부재에 하중으로서 전달하는 밀어 올림 기구(14)를 설치함으로써, 배기 구멍(8)의 밀봉시에 있어서, 정밀하고 안정되게 가압력을 제어한다.
Patent KR-20000050535-A (KR)
Inventor: KANG CHANG SUK
IPC: C03B5/00
Filed: 1999-01-11
Abstract: PURPOSE: A glass melting furnace capable of restraining the external air from flowing in through a burner entrance and reducing inconvenience by waste gas is provided which can prevent heat loss and waste gas from being discharged through a burner entrance. CONSTITUTION: A glass melting furnace (1) comprises a melting furnace for melting glass raw material and a plurality of heat storage chambers (11) arranged at both sides of the melting furnace side by side, wherein it comprises a plurality of ports (15) communicating with the melting furnace and the both heat storage chambers; a plurality of burners (13) installed to be free from coming in and out in the port; a switching device (25) which opens a burner entrance formed in the port when the burner is positioned inside the port and closes the burner entrance when the burner is positioned outside the port.
Patent KR-19990078270-A (KR)
Title: 무선 선택 호출 수신기
IPC: H04W88/02
Filed: 1999-03-25
Abstract: 수신된 호출이 사용자에게 알려질 때 발생되는 노이즈의 영향과 무선부의 특성 저하를 피하고 가격의 인상과 기기 크기의 커짐을 피하기 위한 무선 선택 호출 수신기가 제공된다.  무선부가 "온(on)" 상태에 있을때, 진동기는 전원으로부터 분리되어지고 진동기의 동작 노이즈는 전원선으로 발신되지 않으며 또한 진동기의 전류에 의한 전원의 전압 강하도 역시 발생되지 않는다.
Patent KR-20000061424-A (KR)
Inventor: JUNG YO AN
IPC: H04B7/155
Filed: 1999-03-26
Abstract: PURPOSE: A circuit for automatically controlling analog gains in a mobile communication system is provided to automatically control the gains of an Inphase(I) signal and a Quadrature(Q) signal of an analog baseband, by equipping two signal level detectors converting levels of the I/the Q signals and by applying analog summing processes to the I/the Q signals to amplify the signals. CONSTITUTION: A voltage control attenuator(VCA)(10) amplifies an Inphase signal and a Quadrature(Q) signal if a size of an analog intermediate frequency(IF) signal is small. The I/the Q signals demodulate an IF signal into a quadrature phase shift keying(QPSK) signal. The VCA attenuates the I/the Q signal if the size is big. An I signal demodulator(20-1) and a Q signal demodulator(20-2) demodulate the analog IF signal into a QPSK signal to output the I signal and the Q signal, respectively. An I signal amplifier(AMP)(30-1) and a Q signal AMP(30-2) amplify levels of the I/the Q signals to output the signals. An I signal level detector(40-1) and a Q signal level detector(40-2) apply feedback processes to the amplified I/the Q signals, and detect signal levels. An analog summing amplifier(50) applies analog summing processes to the detected levels of the I/the Q signals, and amplifies predetermined levels of the signals. A comparator(60) compares an analog summing signal amplified in the analog summing amplifier with a reference voltage. A signal stabilizing circuit(70) converts a voltage of the comparator into a control voltage capable of being used in the VCA to output the voltage to the VCA.
Patent KR-20000065354-A (KR)
Inventor: SONG TAE GEOL
IPC: H04B7/155
Filed: 1999-04-02
Abstract: PURPOSE: A method for transmitting a traffic frame of a base station using a backhaul delay, is provided to calculate a backhaul delay between a base station and a control station, and to correct a transmitting time from the control station to the base station if a calculated value is over a permissible level, so as to smoothly perform a call service regardless of the distance between the base station and the control station. CONSTITUTION: A call control processor(CCP) of a control station delivers a MSG-VS-TC-CS to a TSB. When the TSB delivers a time synchronous frame to a cell element(CE), the CE stores a present synchronization time value in the time synchronous frame and delivers the frame. The TSB stores a received synchronization time value in a backhaul request message and re-delivers the message to the CE. The CE compares the synchronous time value returned from the TSB with a present time synchronization time, and divides a difference between the compared values by two to obtain a backhaul delay value. The backhaul delay value is loaded on a backhaul response message, and delivered to the TSB. The TSB compares the backhaul delay value delivered from the CE with a permissible level. If the backhaul delay value is over the permissible level, a 20ms reference time is advanced as much as an exceeded time.
Patent KR-20000067240-A (KR)
Inventor: JUN PIL SEONG
IPC: H04M11/06
Filed: 1999-04-26
Abstract: PURPOSE: A method for managing a power in an asymmetric data transmission apparatus using an asymmetric subscriber line is provided to decrease an average consumption power of an ADSL(Asymmetric Digital Subscriber Line) by not providing the power to a corresponding block of the ADSL in which its operation is unnecessary in a sleep state. CONSTITUTION: If a sleep state is requested in a normal operation mode, a sleep mode state is performed. A transmitting block of an ADSL modem related to a pilot tone transmission for maintaining a loop and a receiving block of the ADSL modem related to a receipt of a normal operation mode return signal are enabled, and other blocks are disabled. If a normal operation mode return request is received in the sleep mode, and all blocks of the ADSL modem are enabled to return the normal operation mode state.
Patent KR-20000067380-A (KR)
Inventor: PARK SUN YEONG
IPC: G01N15/00
Filed: 1999-04-28
Abstract: PURPOSE: Apparatus for measuring non volatile residue is provided to measure a quantity of residual dust inside of a cleaning chamber by measuring non volatile residue. CONSTITUTION: Apparatus for measuring non volatile residue includes a clean bench(10), ultrasonic cleaner(20), a sample rag custody device(30), a stainless steel plate(50), and a very fine balance(40). The clean bench mounts a very pure water supply pipe therein, and requires a cleaning degree below 100. The ultrasonic cleaner cleans a cleaning rag with an ultrasonic cleaning process in a cleaning tub. The stainless steel plate collects non volatile residue of a cleaning chamber. The balance measures the non volatile residue adhered to the rag which the stainless steel plate wiped with. Thereby, the apparatus for measuring non volatile residue measures a quantity of residual dust inside of a cleaning chamber by measuring non volatile residue.
Patent KR-20000067623-A (KR)
Inventor: KWEON YOUNG JUN
IPC: A46B9/04
Filed: 1999-04-30
Abstract: PURPOSE: A toothbrush having needle-shaped brush is provided, which removes dregs and tartar by projecting some tip part of the brush. CONSTITUTION: The toothbrush(1) is such that it comprises needle-shaped brush(3) which is placed on the head(2) of a toothbrush(1) and whose terminal is sharp; and one or more projected parts(4) which are prepared by making the height of needle-shaped hair(3') be higher than that of other needle-shaped hair(3). The elasticity of needle-shaped hair(3') in the projected part(4) is smaller than that of needle-shaped hair(3).
Patent KR-19990064780-A (KR)
Title: 황토로 판재 제조 방법
Filed: 1999-05-04
Abstract: (]) 발명이 속한 기술 분야 
     종이와 보강섬유망을 황토판 양면에 압밀접착하여 만드는 황토판재 제조기술임 
     (2) 발명의 목적 
     풍부한 자원과 환경친화적 소재인 황토로 판재를 만들어 건강친화적이고 보편적으로 널리 사용하기 위함 
     (3) 발명의 구성 
     황토와 보강섬유망 및 종이로 구성하여 물리적 성질을 결합시킨 기술로 황토판 양면에 보강섬유망과 종이를 접착하여 압밀 성형한 판상의 다용도자재이다. 
     (4) 발명의 효과 
     ① 환경친화적이다 
     ② 경제성, 시공성, 보편성이 크다 
     ③ 건강친화적이다 (무독성, 보온성)
Patent KR-20000074341-A (KR)
Inventor: KIM GYE WON
IPC: H01L21/66
Filed: 1999-05-20
Abstract: PURPOSE: A reticle having a mask pattern for test for monitoring a critical dimension condition is provided to overcome a resolution limit and to save manpower and physical resources used in evaluating the critical dimension condition, by precisely evaluating a critical dimension condition. CONSTITUTION: In a scribing region near a device formation region in which a mask pattern for a circuit of a semiconductor device, a mask pattern(24) for test wherein a critical dimension for each size for monitoring a critical dimension condition is splitted is embodied in a reticle(2).
Patent KR-20000005918-A (KR)
Inventor: CONTRERAS JOHN T
IPC: G11B5/012
Filed: 1999-06-04
Abstract: PURPOSE: Apparatus enhances a data recording performance of a magnetic storage device with a high data transmission rate, and a method for the apparatus is provided. CONSTITUTION: A magnetic-head write-driver circuit includes a write-driver circuit and a by-pass driver circuit. The write-driver circuit receives an input signal having a transition, and generates a first write signal related to the input signal. The by-pass driver circuit generates auxiliary signal connected to the first write signal in order to form an output write signal. The auxiliary signal is related to the transition of the first write signal, generates an overshoot to a write signal whenever a transition occurs, and reduces a reversal time of a write signal transition. The auxiliary signal charges/discharges a parasitic capacitance related to an output of the magnetic-head write-driver. The auxiliary signal adds a current to a first write signal in order to form an output write signal, and strengthens a voltage on the first write signal.
Patent KR-20010004571-A (KR)
Title: Redundancy circuit
Inventor: CHO HO YEOP
IPC: G11C29/00
Filed: 1999-06-29
Abstract: PURPOSE: A redundancy circuit is provided to repair a defective word line or a defective column of a specific bank in any bank by inserting a fuse corresponding to a bank address in a row fuse or in a column fuse of a redundancy. CONSTITUTION: In a semiconductor memory device including a number of banks each comprising a spare cell array block as to a row and a spare cell array block as to a column, a redundancy circuit comprises: a row repair unit(650) driving a redundant word line if an address signal selecting the bank in a word line precharge mode and a signal selecting a block and a signal selecting a word line match a programmed fuse; and a column repair unit(670) which generates a row block enable signal if an address signal selecting the bank and a signal selecting a block match the programmed fuse in a self refresh mode, and at this time, drives a redundant column line if an inputted column selection signal and a sub block selection signal match the programmed fuse. Thus, the circuit can repair a defective cell in a specific bank using a redundancy circuit in another bank, by adding a bank selection address in a row fuse box and a column fuse box.
Patent KR-20010004893-A (KR)
Inventor: SHIN CHEOL
IPC: H01L21/20
Filed: 1999-06-30
Abstract: PURPOSE: A method for fabricating a semiconductor device is provided to improve uniformity of a chemical and mechanical polishing process by modifying a capping layer and thereby to stabilize the polishing process and other following processes. CONSTITUTION: First, a polysilicon layer(2) and a tungsten silicide layer(4) are deposited on a wafer to form a gate. Then, a plasma nitride layer(6) and an anti diffused reflection layer are formed as a capping layer on the tungsten silicide layer(4). The anti diffused reflection layer may be a silicon-rich oxynitride layer. Next, the first inter poly oxide layer is deposited and then a chemical and mechanical polishing process is performed thereto. Thereafter, a landing plug contact is formed and then a polysilicon layer is deposited for a landing plug(20). Next, a chemical and mechanical polishing process is performed to form the landing plug(20) until the nitride layer(6) is exposed.
Patent KR-19990073299-A (KR)
Title: 프리볼테지직류전력공급기
Filed: 1999-06-30
Abstract: 본 발명은 프리 볼테지(free voltage) 직류 전력 공급기(DC power supply)의 회로에 관한 것으로, 더욱 상세하게는 선형 변압기를 이용하여 AC 90 V에서 220 V까지의 상용 교류 전압에 대하여 소정의 일정 직류 전압을 만드는 직류 전력 공급기의 회로에 관한 것이다. 
     본 발명의 프리 볼테지 직류 전력 공급기는, 1차측에는 90 V, 130 V, 180V, 그리고 공통(common) 단자를 갖고 2차측에는 임의의 교류 전압 단자가 쌍으로 갖는 선형 변압기, 상용 교류 전압의 변화를 검출하는 전압 검출 회로, 검출된 전압과 기준 전압을 비교한 다음 변압기의 1차측 단자 전압을 바꾸기 위한 비교 및 디코더(decoder) 회로, 디코더 신호를 받아 상용 교류 전압에 해당하는 변압기의 1차측 전압을 선택하는 릴레이(relay) 또는 실리콘 제어 정류기(SCR) 회로, 그리고 교류 전압을 직류 전압으로 바꾸는 정류 회로로 구성되어 있는 것에 특징이 있다. 
     본 발명의 프리 볼테지 직류 전력 공급기의 우수성은 종래의 스위칭 모드 전력 공급기(SMPS)의 장점인 입력 전압으로 프리 볼테지(AC 85 V ∼ 220 V)를 사용하는 것과 종래의 직류 전력 공급기의 장점인 직류 출력 전압에 잡음이 없다는 특징을 그대로 갖고 있다. 따라서, 이를 상용화할 경우 고성능의 전자 장치(예를 들면, 고가의 의료 장비, 고정밀 계측기 등)의 직류 전력 공급기로 활용 가능할 뿐만 아니라 SMPS를 대체 사용할 수 있으므로 그 파급 효과가 매우 높다고 할 수 있다.