KR100337111B1 - Driving frequency control circuit of inverter for driving ccfl - Google Patents

Driving frequency control circuit of inverter for driving ccfl Download PDF

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KR100337111B1
KR100337111B1 KR1019970022096A KR19970022096A KR100337111B1 KR 100337111 B1 KR100337111 B1 KR 100337111B1 KR 1019970022096 A KR1019970022096 A KR 1019970022096A KR 19970022096 A KR19970022096 A KR 19970022096A KR 100337111 B1 KR100337111 B1 KR 100337111B1
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output
piezoelectric transformer
voltage
driving
inverter
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KR1019970022096A
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KR19980085907A (en
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이인성
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삼성전기주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE: A driving frequency control circuit of an inverter for driving a CCFL(Cold Cathode Fluorescence Lamp) is provided to stabilize output current by controlling a driving frequency according to the output current. CONSTITUTION: An output of a comparator(50) is divided by a first and a second resistors(R1,R2) through a diode(D). The divided output of the comparator(50) is inputted into a control portion(10a). A switching portion(20b) is switched by a driving portion(20c). The driving portion(20c) is controlled according to an output of the control portion(10a). A piezoelectric transformer(30) is used for receiving the switched voltage of the switching portion(20b). An output portion(40b) rectifies and smoothens an output of the piezoelectric transformer(30) by using a cold cathode tube(40a). The comparator(50) is used for comparing the output voltage of the output portion(40b) with a reference voltage.

Description

압전체 변압기를 사용한 인버터 주파수 제어회로Inverter Frequency Control Circuit Using Piezoelectric Transformer

본 발명은 압전체 변압기를 사용한 인버터 주파수 제어회로에 관한 것으로서, 더욱 상세하게는 냉음극관(CCFL) 구동용 인버터에서 출력전류에 의하여 구동주파수가 제어됨으로써 출력전류가 안정적으로 되는 압전체 변압기를 사용한 인버터 주파수 제어회로에 관한 것이다.The present invention relates to an inverter frequency control circuit using a piezoelectric transformer, and more particularly, inverter frequency control using a piezoelectric transformer in which a driving current is controlled by an output current in a cold cathode tube (CCFL) driving inverter. It is about a circuit.

일반적으로 압전체(PZT;Piezo Transducer)로 이루어지는 변압기를 사용하여 입력전압을 유기 시켜서 출력전압을 발생시키는 인버터(Inverter)인 전원공급장치는 상기 압전체 변압기의 구동주파수가 가변됨으로써, 압전체 변압기의 출력전압이 제어되게 된다.In general, a power supply device, which is an inverter that generates an output voltage by inducing an input voltage by using a transformer formed of a piezoelectric piezoelectric (PZT), has a variable drive frequency of the piezoelectric transformer, thereby reducing the output voltage of the piezoelectric transformer. To be controlled.

제 1 도는 종래 기술에 따른 DC/DC 콘버터 회로도이다.1 is a DC / DC converter circuit diagram according to the prior art.

종래 기술에 따른 DC/DC 콘버터는 비교부(50)에서 출력되는 신호가 가변저항(Rt)을 통하여 입력되어 펄스폭 제어되는 제어부(10)와, 상기 제어부(10) 출력에 의하여 스위칭되도록 두 개의 트랜지스터인 스위칭소자(Q1)(Q2)로 구성되는 스위칭부(20a)와, 상기 스위칭부(20a)에서 스위칭된 전압이 콘덴서(C) 및 코일(L)을 통하여 입력되는 압전체 변압부(30)와, 상기 압전체 변압부(30)의 출력이 정류되고, 평활되는 출력부(40)와, 상기 출력부(40)의 출력전압(Vo)이 반전단(-)의 입력으로 되고, 기준전압(Vref)이 비반전단(+)으로 입력되어 비교되는 비교부(50)로 구성된다.In the DC / DC converter according to the related art, the control unit 10 having a pulse width controlled by the signal output from the comparator 50 is input through the variable resistor Rt, and the two controllers are switched by the output of the control unit 10. A switching unit 20a composed of switching elements Q1 and Q2 serving as transistors, and a piezoelectric transformer 30 in which a voltage switched by the switching unit 20a is input through a capacitor C and a coil L. And the output of the piezoelectric transformer 30 is rectified, the output 40 to be smoothed, and the output voltage Vo of the output 40 are input to the inverting terminal (-). Vref) is input to the non-inverting stage (+) and consists of a comparison unit 50 to be compared.

상기와 같이 구성되는 종래 기술에 따른 DC/DC 콘버터는 비교부(50)에서 출력되는 신호가 가변저항(Rt)을 통하여 가변되고 펄스폭 변조되도록 제어되는 제어부(10)에 입력되어 주파수 변조된다. 그리고, 상기 제어부(10)에서부터 출력된 펄스폭 변조된 신호에 의하여 스위칭부(20a)의 전계효과 트랜지스터인 두 개의 스위칭소자(Q1)(Q2)가 서로 번갈아서 스위칭됨으로써 정류되고, 상기 스위칭부(20a)에서 출력된 신호는 콘덴서(C) 및 코일(L)을 통하여 압전체 변압부(30)와 주파수가 공진되도록 되어 압전체 변압부(30)로 인가되며, 상기 신호에 의하여 출력부(40)로인가되는 출력전압이 제어된다. 상기 압전체 변압부(30)로부터 출력된 전압인 신호는 출력부(40)에서 정류되고, 평활되어 출력되게 되는데, 상기 출력부(40)의 출력은 비교부(50)의 반전단(-)으로 연결되어 비반전단(+)에 연결된 기준전압(Vref)과 비교됨으로써 제어부(10)의 가변저항(Rt)으로 인가된다.The DC / DC converter according to the related art, which is configured as described above, is inputted to the controller 10 which is controlled so that the signal output from the comparator 50 is varied through the variable resistor Rt and is pulse-width modulated. In addition, two switching elements Q1 and Q2 which are field effect transistors of the switching unit 20a are alternately switched by the pulse width modulated signal output from the control unit 10, thereby rectifying the switching unit 20a. The signal output from) is applied to the piezoelectric transformer 30 by causing the frequency to resonate with the piezoelectric transformer 30 through the capacitor C and the coil L, and is applied to the output unit 40 by the signal. The output voltage is controlled. The signal, which is the voltage output from the piezoelectric transformer 30, is rectified and smoothed at the output unit 40, and the output of the output unit 40 is inverted to the inverting terminal (−) of the comparator 50. It is connected to the reference voltage Vref connected to the non-inverting terminal (+) and applied to the variable resistor Rt of the controller 10.

또한, 제어부(10)에서 펄스폭 변조된 신호는 주파수를 가지고 있으며, 결국 출력되는 신호의 전압과 기준전압(Vref)이 비교부(50)에서 비교되어서 가변저항(Rt)을 통하여 제어부(10)로 인가됨으로써, 상기 압전체 변압부(30)의 구동주파수가 변경되어 압전체 변압부(30)의 출력전압이 제어되게 되는 것이다.In addition, the pulse width modulated signal of the control unit 10 has a frequency, and the voltage of the output signal and the reference voltage Vref are finally compared in the comparing unit 50 and the control unit 10 through the variable resistor Rt. By being applied to, the driving frequency of the piezoelectric transformer 30 is changed so that the output voltage of the piezoelectric transformer 30 is controlled.

그러나, 상기와 같이 되는 종래 기술에 따른 DC/DC 콘버터는 기준전압과 비교된 출력전압이 가변저항에 직접 인가되기 때문에 구동주파수의 변환폭 범위의 제한이 어려운 문제점이 있었다.However, the DC / DC converter according to the related art has the problem that it is difficult to limit the conversion range of the driving frequency because the output voltage compared to the reference voltage is directly applied to the variable resistor.

따라서 본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출한 것으로 발명의 주된 목적은 인버터 입력전압이 일정할 때, 압전체 변압기의 공진 주파수를 제어하고, 인버터 구동 주파수의 가변폭이 제한되는 압전체 변압기를 사용한 인버터 주파수 제어회로를 제공하기 위함이다.Accordingly, the present invention has been made to solve the above-mentioned conventional problems. The main object of the present invention is to control the resonant frequency of the piezoelectric transformer when the inverter input voltage is constant, and the piezoelectric transformer whose variable width of the inverter driving frequency is limited. In order to provide an inverter frequency control circuit using a.

상기 목적을 달성하기 위한 본 발명의 특징은Features of the present invention for achieving the above object

비교부 출력이 다이오드 통하여 제 1 저항과 제 2 저항에서 분배되어 입력되는 제어부와, 상기 제어부 출력에 의하여 스위칭되는 스위칭부와, 상기 스위칭부에서 스위칭된 전압이 입력되는 압전체 변압부와, 상기 압전체 변압부의 출력이 냉음극관을 통하여 정류되고, 평활되는 출력부 및 상기 출력부의 출력전압이 반전단의입력으로 되고, 기준전압이 비반전단으로 입력되어 비교되는 비교부로 구성되는 것에 있다.A control unit for which the output of the comparator is divided by the first resistor and the second resistor through the diode and input, a switching unit switched by the control unit output, a piezoelectric transformer in which the voltage switched by the switching unit is input, and the piezoelectric transformer The negative output is rectified through the cold cathode tube, the output unit being smoothed and the output voltage of the output unit are input to the inverting stage, and the reference voltage is input to the non-inverting stage to be compared.

이하 첨부도면에 의하여 본 발명에 따른 압전체 변압기를 사용한 인버터 주파수 제어회로의 바람직한 일실시예에 대하여 상세하게 설명한다.Hereinafter, a preferred embodiment of an inverter frequency control circuit using a piezoelectric transformer according to the present invention will be described in detail with reference to the accompanying drawings.

제 2 도는 본 발명에 따른 압전체 변압기를 사용한 인버터 주파수 제어회로도이고 제 3 도는 압전체 변압기에서 주파수와 승압비의 관계를 나타낸 도면이다.2 is an inverter frequency control circuit diagram using a piezoelectric transformer according to the present invention, and FIG. 3 is a diagram showing a relationship between a frequency and a boost ratio in the piezoelectric transformer.

본 발명에 따른 압전체 변압기를 사용한 인버터 주파수 제어회로는 비교부(50) 출력이 캐소우드가 직렬로 연결되는 다이오드(D)를 통하여 제 1 저항(R1)과 제 2 저항(R2)에서 분배되어 입력되는 제어부(10a)와, 상기 제어부(10a) 출력에 따라서 제어되는 구동부(20C)에 의하여 스위칭되도록 트랜지스터인 스위칭소자(Q)로 구성되는 스위칭부(20b)와, 상기 스위칭부(20b)에서 스위칭된 전압(Vcc)이 입력되는 압전체 변압부(30)와, 상기 압전체 변압부(30)의 출력이 냉음극관(40a)을 통하여 정류되고, 평활되도록 되는 출력부(40b) 및 상기 출력부(40b)의 출력전압(Vo)이 반전단의 입력으로 되고, 기준전압(Vref)이 비반전단으로 입력되어 비교되는 비교부(50)로 구성된다.In the inverter frequency control circuit using the piezoelectric transformer according to the present invention, the output of the comparator 50 is distributed from the first resistor R1 and the second resistor R2 through the diode D having the cathode connected in series. A switching unit 20b composed of a control unit 10a, a switching element Q which is a transistor so as to be switched by the driving unit 20C controlled according to the output of the control unit 10a, and switching in the switching unit 20b. The piezoelectric transformer 30, to which the supplied voltage Vcc is input, and the output of the piezoelectric transformer 30 are rectified and smoothed through the cold cathode tube 40a, and the output unit 40b. Output voltage Vo is input to the inverting stage, and the reference voltage Vref is input to the non-inverting stage, and is composed of a comparison unit 50 to be compared.

다음은 상기와 같이 구성된 본 발명의 작동상태에 대해서 설명한다.The following describes the operating state of the present invention configured as described above.

상기 압전체 변압부(30)에서 출력되는 전압에 의하여 냉음극관(40a)에 흐르는 전류가 적으면, 출력전압(Vo)이 적게 되기 때문에, 비교부(50)의 반전단(-)으로 인가되는 전압은 작게된다. 따라서, 비교부(50)의 출력이 하이(High)가 되어 케소우드에 하이가 인가되는 다이오드(D)는 턴-오프되고, 이에 따라서 제어부(10a)의제 1 저항(R1) 및 제 2 저항(R2)에 의한 저항 값이 제 1 저항(R1)의 값인 R1로 되어서 압전체 변압부(30)로 인가되는 주파수가 작아지도록 제어부(10a)에 의하여 제어되어서, 제 3 도에서와 같이 작아진 주파수에 의하여 승압비는 커지고 이에 따라서 출력전압(Vo)은 커지게 된다.When the current flowing in the cold cathode tube 40a is small due to the voltage output from the piezoelectric transformer 30, the output voltage Vo is decreased, so that the voltage applied to the inverting terminal (-) of the comparator 50 is reduced. Becomes smaller. Accordingly, the output of the comparator 50 becomes high and the diode D, which is applied high to the cathode, is turned off. Accordingly, the first resistor R1 and the second resistor of the controller 10a ( The resistance value of R2) is controlled by the controller 10a so that the frequency applied to the piezoelectric transformer 30 is reduced by being R1, which is the value of the first resistor R1, so as to reduce the frequency as shown in FIG. As a result, the boost ratio becomes large, and accordingly, the output voltage Vo becomes large.

또한, 상기 압전체 변압부(30)에서 출력되는 전압에 의하여 냉음극관(40a)에 흐르는 전류가 많으면, 비교부(50)의 출력이 로우(Low)가 되어 다이오드(D)는 턴-온된다. 상기 턴-온된 다이오드(D)에 의하여 제어부(10a)의 제 1 저항(R1) 및 제 2 저항(R2)에 의한 저항값이 제 1 저항(R1)과 제 2 저항(R2)의 병렬값으로 되기 때문에 상기 냉음극관(40a)에 적은 전류가 흐르는 경우와 비교하여 작아지게 된다. 따라서, 압전체 변압부(30)로 인가되는 주파수가 커지도록 제어부(10a)에 의하여 제어되어서, 제 3 도에서와 같이 커진 주파수에 의하여 승압비는 작아지기 때문에 출력전압(Vo)은 작아지게 된다.In addition, when the current flowing through the cold cathode tube 40a is large due to the voltage output from the piezoelectric transformer 30, the output of the comparator 50 is low, and the diode D is turned on. The resistance value of the first resistor R1 and the second resistor R2 of the controller 10a is set to the parallel value of the first resistor R1 and the second resistor R2 by the turned-on diode D. Therefore, as compared with the case where a small electric current flows in the said cold cathode tube 40a, it becomes small. Therefore, it is controlled by the controller 10a so that the frequency applied to the piezoelectric transformer 30 is increased, and the output voltage Vo becomes small because the boosting ratio is reduced by the increased frequency as shown in FIG.

한편, 상기 비교부(50)의 출력은 실제의 적용에 있어서, 하이 및 로우로만 동작되는 것이 아니고, 상기 제어부(10a)에 주파수가 제어되도록 인가되는 제 1 저항(R1)과 제 2 저항(R2)의 값은 출력전압(Vo)에 의하여 비교부(50) 출력이 하이와 로우 사이의 범주에서 제어되게 된다.On the other hand, the output of the comparator 50 is not operated only in the high and low in the actual application, the first resistor (R1) and the second resistor (R2) is applied to control the frequency to the controller (10a) ) Is controlled by the output voltage Vo so that the output of the comparator 50 is controlled in the range between high and low.

또한, 노우트북 컴퓨터(Note Book PC)용 전원공급장치인 인버터에서와 같이 입력전압의 변화폭이 크게 되는 경우에는, 구동주파수의 변화폭을 제한하지 않으며 입력전압의 변화가 압전체 변압부(30)의 급격한 효율저하와 발열이 야기되게 된다. 따라서, 제어부(10a)의 제 1 저항(R1) 및 제 2 저항(R2)으로 되는 구성에 의하여,제어부(10a) 입력의 변화폭이 제 1 저항(R1) 및 제 2 저항(R2) 값의 변경 즉, 제 1 저항(R1)의 값이 최대 R1에서부터 최소

Figure pat00004
으로 되기 때문에 제 3 도의 도면에서와 같이, 공진주파수(fr)보다 높은 영역에서 형성되는 압전체 변압기의 최대 구동주파수(fhigh)와 최소 구동수파수(flow) 사이에 구동주파수(fop)가 위치될 수 있도록 제한되어 압전체 변압부(30)에서의 승압 범위가 조정된다.In addition, when the change in the input voltage becomes large, such as in an inverter that is a power supply device for a notebook computer, the change in the driving frequency is not limited and the change in the input voltage causes a sudden change in the piezoelectric transformer 30. It will cause efficiency degradation and heat generation. Therefore, according to the configuration of the first resistor R1 and the second resistor R2 of the controller 10a, the variation of the input of the controller 10a is changed in the values of the first resistor R1 and the second resistor R2. That is, the value of the first resistor R1 is the minimum from the maximum R1.
Figure pat00004
As shown in FIG. 3, the driving frequency f op is set between the maximum driving frequency f high and the minimum driving frequency f low of the piezoelectric transformer formed in the region higher than the resonance frequency fr. The step-up range in the piezoelectric transformer 30 is adjusted so that it can be positioned.

이상에서 상세히 설명한 바와 같이 본 발명에 따른 압전체 변압기를 사용한 인버터 주파수 제어회로는 유전체 변압기의 구동 주파수변화의 폭을 제한함으로써, 인버터에 인가되는 큰 입력전압의 변동에도 안정적으로 동작되는 효과가 있는 것이다.As described in detail above, the inverter frequency control circuit using the piezoelectric transformer according to the present invention has an effect of stably operating even when a large input voltage is applied to the inverter by limiting the width of the driving frequency change of the dielectric transformer.

본 발명은 상기 실시예에 한정되지 않으며, 많은 변형이 본 발명의 기술적 사상 내에서 당 분야의 통상의 지식을 가진 자에 의하여 가능함은 명백하다.The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

제 1도는 종래 기술에 따른 DC/DC 콘버터 회로도,1 is a DC / DC converter circuit diagram according to the prior art,

제 2 도는 본 발명에 따른 압전체 변압기를 사용한 인버터 주파수 제어회로도,2 is an inverter frequency control circuit diagram using a piezoelectric transformer according to the present invention,

제 3 도는 압전체 변압기에서 주파수와 승압비의 관계를 나타낸 도면이다.3 is a diagram illustrating a relationship between a frequency and a boost ratio in a piezoelectric transformer.

※ 도면의 주요 부분에 대한 부호의 설명※ Explanation of codes for main parts of drawing

10, 10a : 제어부 20a, 20b : 스위칭부10, 10a: control unit 20a, 20b: switching unit

20c : 구동부 30 : 압전체 변압부20c: drive part 30: piezoelectric transformer part

40, 40b : 출력부 40a : 냉음극관40, 40b: output portion 40a: cold cathode tube

50 : 비교부50: comparison unit

Claims (1)

비교부에서 출력되는 신호가 역전류 방지용 다이오드 통하여 제 1 저항과 제 2 저항에서 분배되어 입력되는 제어부;A control unit to which the signal output from the comparing unit is divided and input from the first resistor and the second resistor through the reverse current prevention diode; 상기 제어부 출력에 의하여 스위칭되는 스위칭부;A switching unit switched by the control unit output; 상기 스위칭부에서 스위칭된 전압이 입력되는 압전체 변압부;A piezoelectric transformer configured to receive a voltage switched by the switching unit; 상기 압전체 변압부의 출력이 냉음극관을 통하여 정류되고, 평활되는 출력부; 및An output part of which the output of the piezoelectric transformer is rectified and smoothed through a cold cathode tube; And 상기 출력부의 출력전압이 반전단의 입력으로 되고, 기준전압이 비반전단으로 입력되어 비교되는 비교부로 구성되어서 인버터에 인가되는 큰 입력전압의 변동에도 안정적으로 동작되는 것을 특징으로 하는 압전체 변압기를 사용한 인버터 주파수 제어회로.Inverter using a piezoelectric transformer, characterized in that the output voltage of the output unit is an input of the inverting stage, the reference voltage is input to the non-inverting stage and is compared to the comparison unit to operate stably even with a large input voltage variation applied to the inverter. Frequency control circuit.
KR1019970022096A 1997-05-30 1997-05-30 Driving frequency control circuit of inverter for driving ccfl KR100337111B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100639612B1 (en) 2004-09-20 2006-10-30 주식회사 자일론 Driving and Proetecting circuit of lamp
WO2008040251A1 (en) * 2006-09-30 2008-04-10 Proview Technology (Shenzhen) Co., Ltd. Current control method and driving circuit for multi-lamps
US8243005B2 (en) 2004-05-27 2012-08-14 Lg Display Co., Ltd. Apparatus and method for driving lamp of liquid crystal display device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998019348A1 (en) * 1996-10-29 1998-05-07 Dong Il Technology Ltd. Converter with piezoceramic transformer
KR20020058656A (en) * 2000-12-30 2002-07-12 이형도 Apparatus for driving of invertor lamp

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8243005B2 (en) 2004-05-27 2012-08-14 Lg Display Co., Ltd. Apparatus and method for driving lamp of liquid crystal display device
KR100639612B1 (en) 2004-09-20 2006-10-30 주식회사 자일론 Driving and Proetecting circuit of lamp
WO2008040251A1 (en) * 2006-09-30 2008-04-10 Proview Technology (Shenzhen) Co., Ltd. Current control method and driving circuit for multi-lamps

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