公开(公告)号：KR100318215B1

公开(公告)日：2001-12-22

申请号：KR1019990017564

申请日：1999-05-17

Applicant: 한국전기연구원

Inventor： 변영복 ,  서정일 ,  김은수 ,  김태진 ,  박성준

IPC: H02M7/5387 ,  H02M7/48

Abstract: 본발명은단상인버터에관한것으로서, 직류전원부(100)의양단에연결된풀브릿지인버터(200); 상기직류전원부(100)의분압탭과상기풀브릿지인버터(200)의한 암(A)사이에연결된양방향스위칭부(300); 상기인버터(200)의두 개의암(A,B)사이에연결된 LC필터부(500); 시간응답지연이영이되는전달함수를가지며, 부하변동에관계없이출력전압을정현파로유지하고, 부하의변동에따른상기 LC필터부(500)의인덕터(L)의편자현상을보상하기위한데드비트(Deadbeat) 전압/전류제어기(700,800); 상기인덕터에흐르는전류가정격전류이상이되는지를검사하여, 정격전류이상의전류가흐를경우정전류제어모드로제어하기위한정전류제어신호를출력하는정전류제어기(750); 및상기모드절환부(770)로부터제공되는신호에의거하여상기양방향스위칭부(300) 및인버터(200)의각 스위칭소자(Q1∼Q5)를단속제어하기위한펄스폭변조(PWM) 제어기(900)를포함하여구성되어, 출력고조파성분을최대한억제하고, 정격전류이상에서는정전류제어모드로동작되도록출력전압을제어하며, 정격전류이하에서는부하변동에따른편차현상을보상할수 있다.

公开(公告)号：KR100415462B1

公开(公告)日：2004-01-24

申请号：KR1020010007341

申请日：2001-02-14

Applicant: 한국전기연구원 ,  주식회사 세일 기전

Inventor： 김태진 ,  김은수 ,  조기연 ,  변영복 ,  조상명

IPC: B23K9/095

Abstract: PURPOSE: A pulse MAG(metal active gas) arc welding method is provided to promptly solve a short circuit by ascending welding current or flowing the welding current of a certain magnitude for a certain period of time when the shirt circuit is generated during welding. CONSTITUTION: In a welding between a base metal and a feeding wire by a pulse MAG arc welding method of 1 pulse and 1 drop, the pulse MAG arc welding method comprises a first step of setting threshold voltage of welding voltage; a second step of determining whether or not welding voltages per each sections are the same as or lower than the threshold voltage by diving the section into pulse ascent, pulse maintenance, pulse descent and pulse base sections; a third step of judging whether the duration time exceeds the already set certain time or not in case that the welding voltages per each sections are the same as or lower than the threshold voltage as results of the judgement; and a fourth step of solving the short circuit by ascending the welding voltage after judging the case that the duration time exceeds the already set time as a short circuit between the base metal and the feeding wire.

Abstract translation: 目的：提供脉冲MAG（金属活性气体）电弧焊接方法，以便在焊接过程中产生衬衫电路时，通过上升焊接电流或在一定时间内使焊接电流流过一定时间，以迅速解决短路问题。 本发明的脉冲MAG电弧焊接方法包括设定焊接电压的阈值电压的第一步骤，在第一步骤中，通过脉冲MAG电弧焊接方法， 通过将该部分分成脉冲上升，脉冲维持，脉冲下降和脉冲基本部分来确定每个部分的焊接电压是否等于或低于阈值电压的第二步骤; 作为判断结果，在每个区间的焊接电压等于或低于阈值电压的情况下，判断持续时间是否超过已设定的特定时间的第三步骤; 以及在判断持续时间超过已设定时间的情况之后，通过升高焊接电压来解决短路的第四步骤，作为基体金属和馈电线之间的短路。

公开(公告)号：KR1020020066890A

公开(公告)日：2002-08-21

申请号：KR1020010007341

申请日：2001-02-14

Applicant: 한국전기연구원 ,  주식회사 세일 기전

Inventor： 김태진 ,  김은수 ,  조기연 ,  변영복 ,  조상명

IPC: B23K9/095

Abstract: PURPOSE: A pulse MAG(metal active gas) arc welding method is provided to promptly solve a short circuit by ascending welding current or flowing the welding current of a certain magnitude for a certain period of time when the shirt circuit is generated during welding. CONSTITUTION: In a welding between a base metal and a feeding wire by a pulse MAG arc welding method of 1 pulse and 1 drop, the pulse MAG arc welding method comprises a first step of setting threshold voltage of welding voltage; a second step of determining whether or not welding voltages per each sections are the same as or lower than the threshold voltage by diving the section into pulse ascent, pulse maintenance, pulse descent and pulse base sections; a third step of judging whether the duration time exceeds the already set certain time or not in case that the welding voltages per each sections are the same as or lower than the threshold voltage as results of the judgement; and a fourth step of solving the short circuit by ascending the welding voltage after judging the case that the duration time exceeds the already set time as a short circuit between the base metal and the feeding wire.

Abstract translation: 目的：提供脉冲MAG（金属活性气体）电弧焊接方法，在焊接过程中产生衬衫电路时，通过上升焊接电流或一定程度的焊接电流瞬时消除短路。 构成：脉冲MAG电弧焊接方法包括设置焊接电压阈值电压的第一步骤，通过1脉冲和1滴脉冲MAG电弧焊接法，在母材和馈电线之间进行焊接， 第二步骤，通过将所述部分进入脉冲上升，脉冲维持，脉冲下降和脉冲基段来确定每个部分的焊接电压是否等于或低于阈值电压; 在每个部分的焊接电压与阈值电压相同或低于判断结果的情况下，判断持续时间是否超过已设定的一定时间的第三步骤; 以及在将持续时间超过已经设定的时间的情况下判断为母材和供电线之间的短路的情况下，通过升高焊接电压来求解短路的第四步骤。

公开(公告)号：KR100334428B1

公开(公告)日：2002-05-02

申请号：KR1019990002011

申请日：1999-01-22

Applicant: 한국전기연구원

Inventor： 변영복 ,  조기연 ,  서정일

IPC: H02B1/00

Abstract: 본발명은, 배전자동화시스템에서자동화개폐기기가선로에고장이발생하였을경우선로의고장상태를표시함에있어서, 돌입전류및 역방향고장전류에의한표시오동작이발생하지않도록하는개폐기기의선로고장표시제어장치와선로고장의처리방법에관한것으로서, 개폐기기의선로고장표시제어장치의일실시예는, 전압/전류를검출하는전압/전류검출기(10n); 검출전압/전류의대역을필터링하는아날로그필터(11n); 다수전압/전류신호중하나를선택하는아날로그먹스(Mux)(12); 상기선택된신호를샘플링하여그 값을유지하는샘플/홀더(13); 상실기유지되는신호를디지털로변환하는 A/D변환기(14); 상기디지털신호로부터기본파를추출하는기본파추출부(21); 상기기본파위상의급변화를판별하는위상비교부(22); 상기기본파의지수함수적감소형태를검출하는변화유형검출부(23); 상기디지털신호로부터과전류를판별하는과전류판별부(24); 선로를차단/재폐시키는개폐기(42)를동작시키는릴레이(41); 표시부(50); 중앙으로데이터를송신하는모뎀(60); 및상기기본파위상의급변화, 지수함수적감소, 그리고과전류검출여부에따라선로고장을판단하여고장조치를수행하는제어부(100)를포함하여구성되어, 돌입전류또는역방향전류에의한고장표시기의오동작을방지하여, 배전자동화시스템의자동화의효용성을더욱배가시키는발명인것이다.

公开(公告)号：KR100295804B1

公开(公告)日：2001-07-12

申请号：KR1019990019290

申请日：1999-05-27

Applicant: 한국전기연구원

Inventor： 조기연 ,  변영복 ,  서정일 ,  김은수 ,  김태진 ,  전성즙

IPC: H02M3/135

CPC classification number: Y02B70/1491

Abstract: 본발명은영전압-영전류스위칭(ZV-ZCS)을구현하는전원장치용직류/직류컨버터에관한것으로서, 1차측의에너지(전류와전압)를 2차측으로유도하기위한주변압기(100); 전원으로부터상기주변압기(100)의 1차측으로전달되는에너지를단속하기위한스위칭부(200); 상기 2차측의전류를정류하여부하측으로출력하기위한정류부(300); 상기스위칭부(200)의영전압스위칭을위한영전압스위칭부(400); 상기스위칭수단(200)의영전류스위칭을위한영전류스위칭부(500); 및상기스위칭부(200)의스위칭동작을제어하여부하전류의크기및 형태를제어하기위한주제어부(600)로구성되며, 상기영전류스위칭부(500)는상기스위칭부(200)에구비된스위치소자의영전류스위칭필요시, 상기주변압기(100)의 1차측에상기스위칭부(200)로부터상기주변압기의 1차측으로흐르는전류의방향에대하여역방향이되는전압이인가되도록하므로서 1차측전류를 '0'으로감소시켜영전류스위칭이이루어지도록하여스위칭손실을줄이면서주파수를높일수 있으므로효율이향상된소형화전원장치를제공하고, 본발명을저전압, 대전류의분야중 용접기에적용할시 제어수단에의해부하전류의크기및 형태를제어할수 있으므로용접기의성능을크게향상시킨다.

公开(公告)号：KR1020010001162A

公开(公告)日：2001-01-05

申请号：KR1019990020209

申请日：1999-06-02

Applicant: 한국전기연구원

Inventor： 김태진 ,  조기연 ,  변영복 ,  김은수 ,  서정일

IPC: H02M3/139

CPC classification number: Y02B70/1491

Abstract: PURPOSE: A digital control type DC/DC converter is provided to improve a transient response and transient response time and minimize power loss and switching noise by using a digital controller and a lossless snubber circuit to control a two switch type forward DC/DC converter. CONSTITUTION: First and second switches(S1,S2) interrupt/output a DC power according to a high speed switching operation. A high frequency transformer(Tr) introduces a first side power applied by the switching operation to second side. First free wheeling diode(D1) is connected in the reverse direction between the first switch(S1) and the DC power. Second free wheeling diode(D2) is connected in the reverse direction between the second switch(S2) and a ground. A smoothing inductor(Lf) and an output capacitor(Co) smooth the output power. A snubber circuit includes a snubber capacitor(Cs) and first snubber diode(Ds1) connected in series at both ends of the transformer(Tr), and second snubber diode(Ds2) connected to the smoothing inductor(Lf) at the read end. Second side diodes(D3,D4) are zero voltage and zero current switched by the snubber circuit to restrict power loss, vibration and switching noise according to the switching operation.

Abstract translation: 目的：提供数字控制型DC / DC转换器，以通过使用数字控制器和无损耗缓冲电路来控制两个开关型正向DC / DC转换器来改善瞬态响应和瞬态响应时间，并最大限度地减少功率损耗和开关噪声。 构成：第一和第二开关（S1，S2）根据高速切换操作中断/输出直流电源。 高频变压器（Tr）将通过开关操作施加的第一侧功率引入第二侧。 第一空转二极管（D1）在第一开关（S1）和直流电源之间沿相反方向连接。 第二空转二极管（D2）在第二开关（S2）和地之间沿相反方向连接。 平滑电感（Lf）和输出电容（Co）平滑输出功率。 缓冲电路包括在变压器（Tr）的两端串联连接的缓冲电容器（Cs）和第一缓冲二极管（Ds1），以及在读端连接到平滑电感器（Lf）的第二缓冲二极管（Ds2）。 第二侧二极管（D3，D4）是由缓冲电路切换的零电压和零电流，以根据开关操作来限制功率损耗，振动和开关噪声。

公开(公告)号：KR1020000060656A

公开(公告)日：2000-10-16

申请号：KR1019990009165

申请日：1999-03-18

Applicant: 한국전기연구원

Inventor： 조기연 ,  변영복 ,  박충열

IPC: H02H7/085

Abstract: PURPOSE: A light load control device of a motor control center(MCC) unit is provided to operate automatically a motor protection against over-current and low current with forming a control circuit using simple circuit element and logic element. CONSTITUTION: A light load control device of a motor control center(MCC) unit includes a detector(31) which detects by converting a current using a current detection module into a voltage having a determined range value, so to detect. A comparator(32) outputs a reset signal when the voltage value(Vdet) is over a reference value(Vref) in comparison. A counter(33) counts the time by an input clock and initializes the count time by the reset signal. A clock generator(36) generates the clock to be impressed to the counter(33). A time comparator(34) outputs a cut-off control signal when the count time(Tc) is over the reference time(Tref) in comparison. A relay driving section(37) cuts-off a power impressed to a motor according to the cut-off control signal.

Abstract translation: 目的：提供电机控制中心（MCC）单元的轻载控制装置，通过简单的电路元件和逻辑元件形成控制电路，自动运行电机过流和低电流保护。 构成：电动机控制中心（MCC）单元的轻负载控制装置包括检测器，其通过使用电流检测模块将电流转换为具有确定的范围值的电压进行检测，从而进行检测。 当电压值（Vdet）超过参考值（Vref）时，比较器（32）输出复位信号。 计数器（33）通过输入时钟对时间进行计数，并通过复位信号初始化计数时间。 时钟发生器（36）产生要对计数器（33）施加的时钟。 当计数时间（Tc）超过参考时间（Tref）时，时间比较器（34）输出截止控制信号。 继电器驱动部（37）根据截止控制信号切断向电动机施加的动力。

公开(公告)号：KR1020000051513A

公开(公告)日：2000-08-16

申请号：KR1019990002011

申请日：1999-01-22

Applicant: 한국전기연구원

Inventor： 변영복 ,  조기연 ,  서정일

IPC: H02B1/00

Abstract: PURPOSE: An apparatus for controlling display of a line trouble of a switching device for automating power distribution and a method for processing the line trouble are provided to prevent malfunction due to thrust current and counterflow trouble current for precisely displaying a trouble state. CONSTITUTION: An apparatus for controlling of a switching device includes voltage/current detecting elements(101,102..), analog filters(111,112,.) for filtering detected voltage or current band, a mux(12) for selecting one from a plurality of filtered voltage or current signals, a sample/holder(13) for sampling the selected signal periodically to maintain the value, an A/D converter(14) for converting the maintained signal into a digital signal, a digital low pass filter(21) for extracting a fundamental wave component from the digital signal, a phase comparator(22) for comparing a phase of the component, an amplifier(23) for detecting a shape of size change of the extracted fundamental wave, an overcurrent discriminating part(24) for discriminating overcurrent from the digital signal, a relay(41) for operating a switcher(42) of the line, a display(50) for displaying troubles of the line section, a modem(60) for transmitting the trouble to a central control system(200), and a controller(100) for taking measures for the trouble according to the shape of the size change and overcurrent.

Abstract translation: 目的：提供一种用于控制用于自动配电的开关装置的线路故障显示的装置和用于处理线路故障的方法，以防止由于用于精确显示故障状态的推力电流和逆流故障电流引起的故障。 构成：用于控制开关装置的装置包括用于滤波检测电压或当前频带的电压/电流检测元件（101,102 ..），模拟滤波器（111,112），用于从多个滤波器中选择一个的多路复用器 电压或电流信号，用于周期性地对所选择的信号进行采样以维持该值的采样/保持器（13），用于将维持信号转换为数字信号的A / D转换器（14），数字低通滤波器 从所述数字信号中提取基波分量;相位比较器（22），用于比较所述分量的相位，用于检测所提取的基波的大小变化的形状的放大器（23），用于 识别来自数字信号的过电流，用于操作线路的切换器（42）的继电器（41），用于显示线路部分的故障的显示器（50），用于将故障发送到中央控制系统 （200）和控制器 （100）根据尺寸变化和过电流的形状采取措施。

公开(公告)号：KR100506854B1

公开(公告)日：2005-08-08

申请号：KR1020020051738

申请日：2002-08-30

Applicant: 한국전기연구원

Inventor： 김태진 ,  백주원 ,  변영복 ,  조기연 ,  조상명 ,  공현상 ,  임성룡 ,  이현수

IPC: B23K9/09

Abstract: 본 발명은 펄스 아크 용접 중에 아크 길이를 일정하게 유지하면서도, 송급 와이어 끝에서 용융된 금속과 모재 사이의 용적이행이 균일하게 되도록 하는 펄스 아크 용접 방법에 관한 것으로, 펄스 아크 용접 방법은, 피크 전류 공급시간과 베이스 전류 공급시간으로 이루어진 1 펄스 용접 주기에서 송급 와이어를 용융하여 1 용적에 의하여 모재를 용접하는 방법에 있어서, 1펄스 용접 주기동안 용접전압의 합을 시간으로 나누어서 펄스평균전압을 구하고 이를 근거로 하여 다음 주기의 베이스 전류 크기를 결정해서 공급한다.

公开(公告)号：KR100317827B1

公开(公告)日：2001-12-22

申请号：KR1019990011772

申请日：1999-04-03

Applicant: 한국전기연구원

Inventor： 유동욱 ,  조기연 ,  변영복 ,  김은수 ,  김태진 ,  서정일

IPC: H02J7/00

Abstract: 본발명은고주파인버터및 고주파소프트스위칭기술을이용하여, 고전압충전커패시터의수명연장및 충전반복시주파수특성을향상시키는한편, 고압발생시구동주파수를고주파영역으로확장하여, 안정된직류고전압이발생되도록하는고주파고압충전장치에관한것으로, 상기고주파고압충전장치는, 커패시터를충전하는장치에있어서, 입력전압을고주파소프트스위칭에의해고주파교류전압으로변환하는교류변환수단; 상기변환되는교류전압을고압의직류전압으로변환, 승압하여외부의커패시터에인가하는직류변환수단; 및상기커패시터에인가되는전압에의한신호를검출하여, 이에따라상기교류변환수단의고주파소프트스위칭동작을제어하는제어수단을포함하여구성되어, 고주파직렬공진형인버터를위상전이펄스폭 변조방식의제어신호로영(Zero)전압소프트스위칭시켜, 스위칭효율을향상시키고, 2차측이복수개로구성되는전압체배방식의변압기를사용하여 2차측각각의승압비율을낮추어고압변압기를안정되게동작시키고, 주파수에독립되는 CR 분압기를구성하여리플전압을감소시키고, 또한, 고주파인버터및 소형의변압기를사용하여장치의소형화가이루어지도록하는매우유용한발명인것이다.