KR100510109B1 - A preheated circuit for a program start - Google Patents
A preheated circuit for a program start Download PDFInfo
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- KR100510109B1 KR100510109B1 KR10-2002-0049223A KR20020049223A KR100510109B1 KR 100510109 B1 KR100510109 B1 KR 100510109B1 KR 20020049223 A KR20020049223 A KR 20020049223A KR 100510109 B1 KR100510109 B1 KR 100510109B1
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- frequency
- preheating
- lamp
- fluorescent lamp
- program start
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
- H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
- H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
- H05B41/232—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps
- H05B41/2325—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps provided with pre-heating electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
본 발명은 형광램프의 최적 예열방식에 관한 것으로, The present invention relates to an optimal preheating method of a fluorescent lamp,
형광램프를 점등함에 있어서, 램프에 예열전류가 인가되고 그 뒤 방전전압이 인가되어 점등되도록 하는 방식으로, 형광램프에 예열전류가 인가될 때 램프 종류별로 가장 적합한 예열전류를 일정하게 인가하기 위해 그것에 맞는 예열동작 주파수를 설정하여 일정한 시간 동안 예열을 하고 예열시간이 끝나고 나면 수 msec(미리세크) 이내에 점등주파수로 변환되어 형광램프의 방전전압이 인가되고 점등되도록 하는 것이다.In turning on the fluorescent lamp, a preheating current is applied to the lamp and then a discharge voltage is applied so that the lamp is turned on. By setting the correct preheating operation frequency, preheating for a certain time, and after the preheating time is completed, it is converted into the lighting frequency within a few msec (preset) so that the discharge voltage of the fluorescent lamp is applied and turned on.
따라서 소신호용 FET, 다이오드, 콘덴서를 이용하여 최적의 조건으로 형광램프를 점등함으로서, 점등시 필라멘트에 가해지는 스트레스를 최소화하여 램프의 수명을 연장하도록 함을 특징으로 하는 프로그램스타트이다.Therefore, by using a small signal FET, a diode, a capacitor to turn on the fluorescent lamp in the optimum conditions, it is a program start characterized in that to extend the life of the lamp by minimizing the stress applied to the filament during lighting.
Description
본 발명은 형광램프의 최적 예열방식에 관한 것으로, The present invention relates to an optimal preheating method of a fluorescent lamp,
형광램프를 점등함에 있어서, 램프에 예열전류가 인가되고 그 뒤 방전전압이 인가되어 점등되도록 하는 방식으로, 형광램프에 예열전류가 인가될 때 램프 종류별로 가장 적합한 예열전류를 일정하게 인가하기 위해 그것에 맞는 예열동작 주파수를 설정하여 일정한 시간 동안 예열을 하고 예열시간이 끝나고 나면 수 msec(미리세크) 이내에 점등주파수로 변환되어 형광램프의 방전전압이 인가되고 점등되도록 하는 것이다.In turning on the fluorescent lamp, a preheating current is applied to the lamp and then a discharge voltage is applied so that the lamp is turned on. By setting the correct preheating operation frequency, preheating for a certain time, and after the preheating time is completed, it is converted into the lighting frequency within a few msec (preset) so that the discharge voltage of the fluorescent lamp is applied and turned on.
즉 본 발명은 소신호용 FET, 다이오드, 콘덴서를 이용하여 최적의 조건으로 형광램프를 점등하여 램프의 수명을 연장할 수 있도록 하기 위한 프로그램스타트에 관한 것이다.That is, the present invention relates to a program start for extending the life of the lamp by turning on the fluorescent lamp under optimum conditions using a small signal FET, diode, capacitor.
종래의 형광램프 사용회로는 제1도에서와 같이 AC 전압을 DC전압으로 정류하는 다이오드(D1)와, 상기 다이오드의 출력과 병렬 연결된 평활용 전해콘덴서(C1)와, 시동부(A)와, 스위칭부(B)와, 전류제어부(T2)와, 출력부(OUT)로 구성된다.Conventional fluorescent lamp use circuit includes a diode (D1) for rectifying the AC voltage to a DC voltage as shown in Figure 1, a smoothing electrolytic capacitor (C1) connected in parallel with the output of the diode, a starter (A), The switch part B, the current control part T2, and the output part OUT are comprised.
이와 같이 구성된 종래 기술에 대하여 상세히 살펴보면 다음과 같다.Looking at the prior art configured as described in detail as follows.
교류전원이 입력되면 정류다이오드(D1)를 통해 정류되고, 전해콘덴서(C1)을 통해 평활되며, 저항(R1)을 통해 콘덴서(C2)가 충전되고 연결된 다이액(TD)이 도통되면 트랜지스터(Q2)가 동작되어 시동되며, 드라이브 트랜스(T1)가 교번하여 트랜지스터 (Q1) (Q2)를 동작시켜 전해콘덴서(C1)를 통해 평활된 DC전압이 고주파의 구형파로 되어 인덕터(T2)를 통해 고주파의 사인파가 되어 램프와 콘덴서(C3)에 인가되는 순간 콘덴서(C3)가 방전되면서 형광램프가 점등된다. When AC power is input, it is rectified through the rectifying diode D1, smoothed through the electrolytic capacitor C1, the capacitor C2 is charged through the resistor R1, and when the connected die solution TD is conducted, the transistor Q2 is conducted. ) Is operated and started, and the drive transformer T1 alternates to operate the transistors Q1 and Q2 so that the DC voltage smoothed through the electrolytic capacitor C1 becomes a square wave of high frequency, thereby inducing high frequency through the inductor T2. As soon as the sine wave is applied to the lamp and the capacitor C3, the capacitor C3 is discharged and the fluorescent lamp is turned on.
그러나, 상기에서와 같은 종래 기술로는 현재 지속적으로 변화해 가는 형광램프의 세관화로 인한 방전전압을 맞추기가 어렵다. 즉 충분한 예열이나 높은 전압으로 형광램프의 적절한 점등을 구현하기가 불가능하여 형광램프의 필라멘트가 심한 스트레스를 받아 단 몇 회의 점등으로도 짙은 흑화현상이 일어나거나 단선이 되어 형광램프의 수명을 단축시키는 문제점이 있었다.However, in the prior art as described above, it is difficult to match the discharge voltage due to the tubularization of the fluorescent lamp which is constantly changing. In other words, it is impossible to realize proper lighting of the fluorescent lamp with sufficient preheating or high voltage, so that the filament of the fluorescent lamp is severely stressed, resulting in dark blackening or short circuiting, which shortens the lifetime of the fluorescent lamp. There was this.
본원발명은 상기한 바와 같은 종래기술의 문제점을 해결하기 위한 것으로, The present invention is to solve the problems of the prior art as described above,
본원발명의 목적은 부하별 형광램프의 적절한 예열을 하기 위해 일정한 시간 동안 일정한 주파수를 설정하는 프로그램스타트 방식을 이용함으로서, 최근 세관화로 인하여 방전전압이 높아진 T5 램프 등과 같은 형광램프의 점등시 내부의 필라멘트에 가해지는 스트레스를 최소화하는데 있다. The purpose of the present invention is to use a program start method that sets a constant frequency for a certain time in order to properly preheat the fluorescent lamps for each load, the internal filament when the fluorescent lamps such as T5 lamps such as T5 lamps with high discharge voltage due to the recent tubularization To minimize the stress on the
상기 목적을 달성하기 위한 본 발명의 구성 및 동작과정을 도2를 참조하여 설명하면 다음과 같다. Referring to Figure 2 the configuration and operation of the present invention for achieving the above object is as follows.
이하. 첨부한 도면을 참조하여 본원발명의 전체적인 구성을 살펴보면,Below. Looking at the overall configuration of the present invention with reference to the accompanying drawings,
도2는 본 발명에 의한 최적의 형광램프 예열회로도로서, 2 is an optimum fluorescent lamp preheating circuit diagram according to the present invention;
본원발명은 도면에 도시한 바와 같이 형광램프의 예열회로를 구성함에 있어서, 정류다이오드(D1)와 평활콘덴서(C1)에 의해 전원이 공급되고 서로 다른 시간차를 갖는 구형파 펄스를 출력하는 주파수 발생부(U1)와; 이것을 일정한 시간동안 일정한 주파수로 가변하는 프로그램스타트부(PS)와; 정류된 DC전원을 주파수 발생부(U1)의 펄스에 의해 스위칭하는 스위칭부(T1)와; 램프전류를 일정하게 유지시키는 전류제한부(T2)와; 램프(FL)와 병렬로 연결된 콘덴서(C6)로 구성된 출력부(OUT)를; 포함하여 구성됨을 특징으로 한다.According to the present invention, in the preheating circuit of a fluorescent lamp, as shown in the drawing, a frequency generator for supplying a square wave pulse having a different time difference is supplied with power by a rectifying diode (D1) and a smoothing capacitor (C1) ( U1); A program start unit (PS) which varies this at a constant frequency for a certain time; A switching unit T1 for switching the rectified DC power supply by the pulse of the frequency generating unit U1; A current limiting section T2 for maintaining a constant lamp current; An output part OUT configured of a capacitor C6 connected in parallel with the lamp FL; Characterized in that configured to include.
상기와 같이 구성된 본 발명의 동작 과정을 보다 상세히 설명하면 다음과 같다.Referring to the operation of the present invention configured as described above in more detail.
정류다이오드 D1과 C1의 평활콘덴서를 통해 전원이 공급되고 시동저항(R1)을 통해 주파수 발생부(U1)가 시동되어 FET(Q1, Q2)가 스위칭 동작을 시작하면서 전류제한부(T2)에 전류가 흐르면, (T2) 2차측에서 유기된 전압은 다이오드(D2)에 의해 교류성분이 제거되고 저항(R4)에 의해 전압을 조절한 후, 전해콘덴서 (C2)에 충전되고 제너다이오드(ZD1)에 클램핑되어 주파수 발생부(U1)에 전원을 공급한다.Power is supplied through the rectifying diodes D1 and C1, and the frequency generator U1 is started through the starting resistor R1, and the FETs Q1 and Q2 start a switching operation. When is flowed, the voltage induced at the secondary side of (T2) is removed from the AC component by the diode (D2) and regulated the voltage by the resistor (R4), and then charged in the electrolytic capacitor (C2) and Zener diode (ZD1) It is clamped to supply power to the frequency generator U1.
상기 시동저항(R1)을 통해 주파수 발생부(U1)가 시동됨과 동시에 저항(R5), (R6)의 분배전압에 의해 시그널FET(Q3)가 ON되어 주파수 발생부(U1)의 1번 핀을 Short시키면 3번 핀의 (R7) 시정수에 의해 주파수가 결정되어 정상동작 주파수 보다 높은 주파수로 형광램프의 예열동작을 실행한다.The frequency generator U1 is started through the starting resistor R1 and the signal FET Q3 is turned on by the divided voltages of the resistors R5 and R6 to turn off pin 1 of the frequency generator U1. If it is short, the frequency is determined by (R7) time constant of pin 3 and the preheating operation of the fluorescent lamp is executed at a frequency higher than the normal operating frequency.
상기 예열동작 실행 시간은 분배전압에 의해 (C4)의 충전이 완료될 때까지 지속되며, 상기 시간 동안 일정한 주파수로 예열을 유지하다가 충전이 완료되면 (Q4)가 ON되어 (Q3)의 게이트 전압을 20 msec(미리세크)이내에 영전압으로 다운시킨다. 예열주파수에서 정상동작 주파수로 떨어지면서 상기 주파수가 미리 설정된 공진주파수로 바뀌게 되면 이와 동시에 쵸크인덕터(T2)와 (C6)의 공진이 이루어지고 이어서 형광램프가 방전되어 점등된다.The preheating operation execution time lasts until the charging of the C4 is completed by the distribution voltage, and the preheating operation is maintained at a constant frequency during the time, and when the charging is completed, the Q4 is turned ON to reset the gate voltage of the Q3. Reduce to zero voltage within 20 msec (mm). When the frequency changes from the preheating frequency to the normal operating frequency and changes to the preset resonance frequency, the resonance of the choke inductors T2 and C6 is simultaneously performed, and then the fluorescent lamp is discharged and turned on.
이와 같은 동작이 전원 투입 차단을 빠르게 해도 항상 일정한 시간과 일정한 주파수로 동작이 가능하게 되는 것은 Even if such an operation is quickly turned off, it is possible to operate at a constant time and at a certain frequency.
쵸크인덕터(T2)의 2차측에 유기된 AC 전압을 다이오드(D2)를 통해 정류해서 저항(R4)을 통해 주파수 발생부(U1)에 전원을 공급하고, AC voltage induced on the secondary side of the choke inductor T2 is rectified through the diode D2, and power is supplied to the frequency generator U1 through the resistor R4.
쵸크인덕터(T2)의 2차측에 또 다른 다이오드(D3)에서 정류된 전압은 다이오드(D4)가 역방향으로 연결되어 있어 (T2)의 2차측에 유기된 전압을 유지하며, The voltage rectified by another diode D3 on the secondary side of the choke inductor T2 maintains the voltage induced on the secondary side of T2 because the diode D4 is connected in the reverse direction.
저항(R8) (R9)사이에 전압은 (D4)가 순방향으로 연결되어 있어도 다이오드(D3)를 통한 전압보다 전위차가 낮아서 도통되지 않아 (Q4)의 게이트 전압이 그대로 유지되어 (Q3)를 항상 OFF 상태로 유지해서 정상동작 주파수를 유지할 수 있고, The voltage between the resistors R8 and R9 is not conducting because the potential difference is lower than the voltage through the diode D3 even when (D4) is connected in the forward direction, so that the gate voltage of (Q4) is maintained as it is, so that (Q3) is always OFF. Can keep the normal operating frequency
전원 투입이 차단되면 저항(R10)과 콘덴서(C5)의 시점수가 낮아 동시에 영전위가 되고 (Q4)가 투입되기 전의 초기화 상태로 돌아가는데 걸리는 시간이 약 100 msec(미리세크) 이내로 되기 때문이다.This is because when the power supply is cut off, the number of viewpoints of the resistor R10 and the capacitor C5 is low and at the same time becomes zero potential, and the time taken to return to the initialization state before the input of Q4 is within about 100 msec (preset).
여기에서 일 실시예를 들어 설명하면, If an embodiment is described here,
저항 R1을 통해 주파수발생부(U1)의 8번 핀으로 전원이 공급되면 주파수발생부(U1)가 시동된다. 이와 동시에 저항(R5, R6)의 분배전압이 시그널FET(Q3)의 Gate에 인가되어 Q3가 on되면 주파수발생부(U1)의 1번핀 전압을 0.4V로 고정시킨다. 주파수발생부(U1)의 1번핀은 2.9V일 때 정상주파수(45KHz)로 동작하는데 위와 같이 0.4V로 하고 저항(R7)을 이용하여 3번핀에 흐르는 전류를 제한하여 동작주파수가 70(KHz)로 고정되고 저항(R8, R9)의 분배전압으로 콘덴서(C4)가 충전되어 시그널 FET(Q4)의 Gate에 인가되어 Q4가 on되면 Q3의 Gate전압이 떨어져 Q3가 off되면서 주파수발생부(U1)의 1번핀 전압이 2.9V가 되고 6번, 7번핀으로 정상동작주파수가 나온다. 여기에서 주파수발생부(U1)은 주파수발생을 위한 발진용 Gate Drive IC를 의미하는 것으로, 지역에 따라서는 이를 포괄적으로 MOSFET (metal-oxide semiconductor field-effect transistor)로 표현하기도 한다. 또한 발진회로분야에서는 여기에 기능을 부가하여 Drive IC, Gate IC, Gate drive IC, Ballast Control IC, Electronic Ballast Controller 혹은 Simple Ballast Controller 등과 같은 다양한 용어로 불리우기도 한다. 여기에서는 편의상 이 기술분야에서 자주 사용하는 약어인 Gate Drive IC로 표현하기로 한다. 본원발명에서는 저항 R1을 통해 상기 Gate Drive IC의 8번 핀으로 전원을 공급하여 주파수발생부를 구동시킨다.When power is supplied to pin 8 of the frequency generator U1 through the resistor R1, the frequency generator U1 is started. At the same time, the divided voltages of the resistors R5 and R6 are applied to the gate of the signal FET Q3, and when Q3 is turned on, the voltage at pin 1 of the frequency generator U1 is fixed to 0.4V. Pin 1 of the frequency generator (U1) operates at normal frequency (45KHz) at 2.9V. It is set to 0.4V as above and the current flowing through pin 3 is limited by using a resistor (R7) .The operating frequency is 70 (KHz). The capacitor C4 is charged to the division voltage of the resistors R8 and R9 and is applied to the gate of the signal FET Q4. When Q4 is turned on, the gate voltage of Q3 drops and Q3 is turned off. Pin 1's voltage is 2.9V and pins 6 and 7 come to normal operating frequency. Here, the frequency generator U1 refers to an oscillation gate drive IC for generating a frequency, and in some regions, the frequency generator U1 may be referred to as a MOSFET (metal-oxide semiconductor field-effect transistor). In addition, in the field of oscillation circuit, it is sometimes called various terms such as Drive IC, Gate IC, Gate drive IC, Ballast Control IC, Electronic Ballast Controller or Simple Ballast Controller. For convenience, the abbreviation Gate Drive IC, which is frequently used in the art, will be referred to. In the present invention, power is supplied to pin 8 of the gate drive IC through the resistor R1 to drive the frequency generator.
Main 전원 off시 FET(Q4)의 Gate에 연결된 캐패시터(C4)의 충전된 전압을 빠르게 방전시키기 위해 다이오드(D4)를 연결하여 저항(R10)으로 방전이 되도록 하고, Main 전원을 빠르게 재투입시 캐패시터(C4)는 처음과 마찬가지로 완전방전된 상태이므로 항상 일정한 시간의 일정한 주파수로 동작이 된다. When the main power is off, in order to quickly discharge the charged voltage of the capacitor C4 connected to the gate of the FET Q4, the diode D4 is connected to discharge the resistor R10. As (C4) is completely discharged like the first time, it always operates at a certain frequency of a certain time.
정상 동작시에는 FET(Q4)는 게속 on되어 있어야 하는데 그러기 위해서는 FET(Q4)의 Gate전압이 유지되어야 한다. 그래서 인턱터(T2)의 2차측에 유기된 전압을 다이오드(D3)를 통해 정류하고 콘덴서(C5)로 평활하여 얻어진 DC전압이 다이오드(D4)를 통한 FET(Q4)의 Gate 전압보다 높은 전위차로 인해 다이오드(D4)가 도통되지 않아 FET(Q4)의 Gate 전압이 유지되게 된다.In normal operation, the FET Q4 should be continuously on. To do this, the gate voltage of the FET Q4 must be maintained. Therefore, the DC voltage obtained by rectifying the voltage induced on the secondary side of the inductor T2 through the diode D3 and smoothing the capacitor C5 is caused by a potential difference higher than the gate voltage of the FET Q4 through the diode D4. The diode D4 is not conductive so that the gate voltage of the FET Q4 is maintained.
따라서 본 발명에 의하면 최근의 형광램프 세관화로 인한 램프 점등 소등시 발생되는 심각한 램프수명 저하와 일반 형광램프의 잦은 점등 소등시 문제되는 흑화현상을 최적의 예열방식을 이용하여 수행함으로서 램프수명을 연장하고, 흑화현상을 최소화하는 탁월한 효과를 갖는다. Therefore, according to the present invention, the lamp life is extended by performing the optimal preheating method to perform the severe lamp life deterioration that occurs when the lamp is turned off due to the recent fluorescent lamp tubularization and the blackening phenomenon which is a problem when the frequent lighting of the general fluorescent lamp is turned off. It has an excellent effect of minimizing blackening.
도1은 종래의 형광램프의 스타트를 위한 예열회로도1 is a preheating circuit diagram for starting a conventional fluorescent lamp
도2는 본 발명에 의한 최적의 형광램프 예열회로도Figure 2 is an optimal fluorescent lamp preheating circuit diagram according to the present invention
도3은 예열주파수와 동작주파수의 관계도.3 is a diagram illustrating a relationship between a preheating frequency and an operating frequency.
< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>
U1 : 주파수 발생부 PS : 프로그램스타트부U1: Frequency generator PS: Program start unit
T1 : 스위칭부 T2 : 전류제한부T1: switching part T2: current limiting part
FL : 램프 OUT : 출력부 FL: Lamp OUT: Output
C1 ~ C6 : 콘덴서 C1 ~ C6: Capacitor
D1 ~ D4 : 다이오드D1 ~ D4: Diode
R! ~ R10 : 저항R! ~ R10: resistance
Q1, Q2, Q3, Q4 : FETQ1, Q2, Q3, Q4: FET
ZD1 : 제너다이오드ZD1: Zener Diode
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| KR10-2002-0049223A KR100510109B1 (en) | 2002-08-20 | 2002-08-20 | A preheated circuit for a program start |
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| Application Number | Priority Date | Filing Date | Title |
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| KR10-2002-0049223A KR100510109B1 (en) | 2002-08-20 | 2002-08-20 | A preheated circuit for a program start |
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| KR100510109B1 true KR100510109B1 (en) | 2005-08-24 |
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| KR100828739B1 (en) * | 2006-12-07 | 2008-05-09 | 엘지이노텍 주식회사 | Soft start time control circuit of inverter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0845682A (en) * | 1994-07-27 | 1996-02-16 | Fuji Electric Co Ltd | Discharge lamp lighting device |
| JPH0850994A (en) * | 1994-08-09 | 1996-02-20 | Fuji Electric Co Ltd | Lighting device for electric discharge lamp |
| KR0147437B1 (en) * | 1994-07-02 | 1998-10-01 | 박광래 | Electronic fluorescent lamp ballast circuit |
| JPH1145794A (en) * | 1997-07-28 | 1999-02-16 | Mitsubishi Electric Corp | Lighting circuit device for discharge lamp |
| KR20020089885A (en) * | 2001-05-25 | 2002-11-30 | 화인테크주식회사 | Electronic ballast heated at a constant current level |
| KR20030068251A (en) * | 2002-02-14 | 2003-08-21 | 송수민 | Integrated control circuits for electronic ballast |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0147437B1 (en) * | 1994-07-02 | 1998-10-01 | 박광래 | Electronic fluorescent lamp ballast circuit |
| JPH0845682A (en) * | 1994-07-27 | 1996-02-16 | Fuji Electric Co Ltd | Discharge lamp lighting device |
| JPH0850994A (en) * | 1994-08-09 | 1996-02-20 | Fuji Electric Co Ltd | Lighting device for electric discharge lamp |
| JPH1145794A (en) * | 1997-07-28 | 1999-02-16 | Mitsubishi Electric Corp | Lighting circuit device for discharge lamp |
| KR20020089885A (en) * | 2001-05-25 | 2002-11-30 | 화인테크주식회사 | Electronic ballast heated at a constant current level |
| KR20030068251A (en) * | 2002-02-14 | 2003-08-21 | 송수민 | Integrated control circuits for electronic ballast |
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