KR100920957B1 - Soft Start Circuit of Power supply device - Google Patents

Soft Start Circuit of Power supply device Download PDF

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KR100920957B1
KR100920957B1 KR1020070106806A KR20070106806A KR100920957B1 KR 100920957 B1 KR100920957 B1 KR 100920957B1 KR 1020070106806 A KR1020070106806 A KR 1020070106806A KR 20070106806 A KR20070106806 A KR 20070106806A KR 100920957 B1 KR100920957 B1 KR 100920957B1
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voltage
resistor
power
potential
soft start
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KR1020070106806A
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Korean (ko)
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KR20090041216A (en
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배철수
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엘지이노텍 주식회사
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/13—Modifications for switching at zero crossing
    • H03K17/133—Modifications for switching at zero crossing in field-effect transistor switches
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

본 발명은 전원공급장치에 관한 것이다.

본 발명은 파워 오프 시에 소프트 스타트 회로의 전위를 영전위로 조절함으로써, 딥-업 테스트 시 과도현상으로 딥 시에 소프트 스타트 회로의 전압이 상승함에 따른 소프트 스타트 회로의 오동작을 방지할 수 있다.

Figure R1020070106806

전원공급장치, 역률조정부, 소프트스타트, 지연, PDP, LCD

The present invention relates to a power supply.

According to the present invention, by controlling the potential of the soft start circuit to zero potential at the time of power-off, malfunction of the soft start circuit due to an increase in the voltage of the soft start circuit at the time of dip due to a transient phenomenon during the dip-up test can be prevented.

Figure R1020070106806

Power supply, power factor adjustment, soft start, delay, PDP, LCD

Description

전원공급장치의 소프트 스타트회로 {Soft Start Circuit of Power supply device}Soft Start Circuit of Power Supply Device

도 1은 종래예에 따른 전원공급장치의 역률조정부 내 소프트스타트회로를 도시한 회로도.1 is a circuit diagram showing a soft start circuit in a power factor adjusting unit of a power supply apparatus according to the prior art.

도 2는 종래예에 따른 딥-업 테스트 시 과도현상을 나타낸 파형도.2 is a waveform diagram showing a transient phenomenon in a dip-up test according to the prior art.

도 3은 본 발명의 일실시예에 따른 전원공급장치의 역률조정부 내 소프트스타트회로를 도시한 회로도.3 is a circuit diagram illustrating a soft start circuit in a power factor adjusting unit of a power supply according to an embodiment of the present invention.

도 4는 본 발명의 일실시예에 따른 딥-업 테스트 시 과도현상이 억제됨을 나타낸 파형도.Figure 4 is a waveform diagram showing that the transient phenomenon is suppressed during the dip-up test according to an embodiment of the present invention.

＜도면의 주요부분에 사용된 부호의 설명＞<Description of the code used in the main part of the drawing>

110: 지연부110: delay unit

120: 제어부120: control unit

130: 전압검출부130: voltage detector

140: 전위조절부140: potential control unit

Q1, Q2: 스위칭소자Q1, Q2: switching element

본 발명은 전원공급장치에 관한 것이다.The present invention relates to a power supply.

일반적으로 LCD(Liquid Crystal Display)나 PDP(Plasma Display Panel)등의 평판디스플레이장치 등에 구동전원을 공급하는 전원공급장치는, 외부로부터 입력되는 교류전원을 스탠바이 전원으로 변환하여 출력하는 스탠바이 전원부와 외부로부터 입력되는 교류전원의 역률을 보정하는 역률조정부(Power Factor Correction; PFC)와 다양한 레벨의 전압을 출력하는 멀티 전원부와 디스플레이소자 또는 백라이트 등을 구동하기 위한 전압을 출력하는 인버터부 등을 포함한다.In general, a power supply unit for supplying driving power to a flat panel display device such as an LCD (Liquid Crystal Display) or a plasma display panel (PDP) is a standby power supply unit that converts an AC power input from the outside into a standby power source and outputs it from an external source. A power factor correction unit (PFC) for correcting a power factor of an input AC power source, a multi-power unit for outputting voltages of various levels, and an inverter unit for outputting a voltage for driving a display element or a backlight, and the like.

상기 역률조정부에는 전원공급장치의 파워 온(Power ON) 시 전압의 급상승을 방지하기 위해 외부로부터 교류전원이 인가되는 시간으로부터 킥오프(Kick-Off) 시간동안 전원공급을 일시 중지시키는 소프트 스타트(Soft Start)회로를 포함하고 있다.The power factor adjusting unit has a soft start for temporarily stopping the power supply for a kick-off time from the time when the AC power is applied from the outside to prevent a sudden increase in voltage when the power supply is turned on. It includes a circuit.

상기 소프트 스타트 회로는, 도 1에 도시된 바와 같이, 외부로부터 교류전원이 인가되면 일정레벨의 전압이 입력되는 전압입력단(VCC)과, 이 전압입력단(VCC)을 통해 입력되는 전압을 충전하도록 병렬 연결된 복수의 캐패시터(Ca, Cb)와 저항(Ra, Rb)으로 구성된 지연부(10)와, 이 지연부(10)를 통해 충전된 전압 즉, Comp단의 전압을 설정전압과 비교하여 설정전압 이상이면 스위칭소자(Q1)을 구동하여 장치 내로 구동전원이 인가되도록 제어하는 제어부(20)를 포함한다. As illustrated in FIG. 1, the soft start circuit is configured to charge a voltage input terminal VCC to which a predetermined level of voltage is input when an AC power source is applied from the outside, and charge the voltage input through the voltage input terminal VCC. The delay unit 10 includes a plurality of connected capacitors Ca and Cb and resistors Ra and Rb, and the voltage charged through the delay unit 10, that is, the voltage at the Comp terminal, is compared with the set voltage. The control unit 20 controls the driving power to be applied to the device by driving the switching element Q1.

한편, 세계 안전규격 기준에는 교류 딥-업(AC Dip-up) 테스트 항목이 있는데, 이 딥-업 테스트에 따르면 전원공급장치를 수차례 온/오프시켜서 파워 온(Power ON) 순간의 전류 파형에 포화 현상이 발생되지 않을 것을 요구하고 있다.On the other hand, there is an AC Dip-up test item in the global safety standard, which according to the dip-up test, turns the power supply on and off several times to apply the current waveform at the moment of power-on. It is required that no saturation phenomenon occurs.

그런데, 종래의 전원공급장치는 순간적인 과도현상으로 인해 도 2의 (a)에서 "A"로 표시된 구간에 나타난 바와 같이 소프트스타트 회로 내의 comp 단 전압이 딥(Dip) 시(파워 오프 시)에 급상승하면서, 업(Up) 시(파워 온 시)에 소프트스타트 회로 내의 지연부(10)에서 전압이 충전되는 시간을 갖지 못하고 바로 전원이 인가되는 즉, 소프트스타트 동작이 수행되지 않음에 따라 도 2의 (b)에서 "B"로 표시된 구간에 나타난 바와 같이 포화현상이 발생되는 문제점이 있었다.However, in the conventional power supply device, due to instantaneous transients, the comp terminal voltage in the soft start circuit is in the dip state (when power off), as shown in the section indicated by “A” in FIG. As a sudden rise, power is applied immediately, that is, the time is not charged in the delay unit 10 in the soft start circuit at the time of Up (power on), that is, the soft start operation is not performed. There is a problem that saturation occurs as shown in the section indicated by "B" in (b).

상기한 과도현상은 역률조정부를 복수의 인덕터를 채용한 토폴로지(Topolgy) 구조로 구성한 경우에 주로 관찰되고 있다.The above transient phenomenon is mainly observed when the power factor adjusting unit is composed of a topology structure employing a plurality of inductors.

참고적으로, 도 2에서 W1은 역률조정부의 출력전압 측정파형, W2는 소프트스타트 회로의 comp단 전압 측정파형, W3, W4는 역률조정부의 인덕터 전류 측정파형이다. For reference, in FIG. 2, W1 is an output voltage measurement waveform of the power factor adjusting unit, W2 is a comp voltage measurement waveform of the comp terminal of the soft start circuit, and W3 and W4 are inductor current measurement waveforms of the power factor adjusting unit.

본 발명은 딥-업 테스트 시에 과도현상으로 인한 소프트스타트회로의 오동작을 방지할 수 있다.The present invention can prevent a malfunction of the soft start circuit due to a transient phenomenon during the dip-up test.

본 발명의 일실시예에 따른 전원공급장치는 전원공급장치에 있어서, 입력되는 전압을 충전하는 지연부; 상기 지연부에서 충전된 전압이 설정전압 이상이 되면 상기 충전된 전압으로 구동전원을 인가하는 제어부; 외부로부터 입력되는 교류전압의 레벨을 검출하는 전압검출부; 상기 전압검출부에서 검출되는 교류전압의 레벨에 따라 상기 지연부에 충전되는 전압의 전위를 조절하는 전위조절부를 포함한다.In accordance with an aspect of the present invention, a power supply apparatus includes: a delay unit configured to charge an input voltage; A controller configured to apply driving power to the charged voltage when the voltage charged by the delay unit is equal to or higher than a set voltage; A voltage detector detecting a level of an AC voltage input from the outside; And a potential adjusting unit for adjusting the potential of the voltage charged in the delay unit according to the level of the AC voltage detected by the voltage detecting unit.

여기서, 상기 전압검출부는 외부로부터 교류전원이 입력되는 교류전원입력단과, 상기 교류전원입력단에 그 일단이 연결된 제1 저항과, 그 일단이 상기 제1 저항의 타단에 연결되고 그 타단이 그라운드단에 연결된 제2 저항과, 그 일단이 상기 제1 저항의 타단과 상기 제2 저항의 일단에 공통 연결되고 그 타단이 그라운드단에 연결된 캐패시터와, 그 일단이 상기 제1 저항의 타단과 상기 제2 저항의 일단 및 상기 캐패시터의 일단에 공통 연결되고 타단이 상기 전위조절부에 연결된 제3 저항을 포함할 수 있다.Here, the voltage detector includes an AC power input terminal through which AC power is input from the outside, a first resistor having one end connected to the AC power input terminal, one end connected to the other end of the first resistor, and the other end connected to the ground end. A second resistor connected to the capacitor, one end of which is commonly connected to the other end of the first resistor and one end of the second resistor, and the other end of which is connected to the ground terminal, and the other end of the first resistor and the second resistor; A third resistor may be commonly connected to one end of the capacitor and one end of the capacitor, and the other end of the third resistor may be connected to the potential controller.

또한, 상기 전위조절부는 레퍼런스단이 상기 전압검출부에 연결되고 캐소드단이 전압입력단에 연결되며 애노드단이 그라운드단에 연결되는 션트 레귤레이터와, 상기 션트 레귤레이터의 동작에 따라 인가되는 구동전압에 의해 스위칭 온되어 상기 지연부를 그라운드단으로 연결하는 스위칭소자를 포함할 수 있다.In addition, the potential controller is switched on by a shunt regulator having a reference terminal connected to the voltage detector, a cathode terminal connected to a voltage input terminal, and an anode terminal connected to a ground terminal, and a driving voltage applied according to the operation of the shunt regulator. And a switching device connecting the delay unit to the ground terminal.

이하, 본 발명의 바람직한 실시예에 대하여 첨부도면을 참조하여 상세히 설 명한다.Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail.

도 3은 본 발명의 일실시예에 따른 전원공급장치의 역률조정부 내 소프트스타트회로를 도시한 회로도이다.3 is a circuit diagram illustrating a soft start circuit in a power factor adjusting unit of a power supply apparatus according to an embodiment of the present invention.

도 3을 참조하면, 본 발명의 일실시예에 따른 전원공급장치는 역률조정부를 포함하고, 역률조정부 내에 지연부(110)와 제어부(120)와 스위칭소자(Q1)와 전압검출부(130) 및 전위조절부(140)를 포함하는 소프트 스타트 회로를 갖추고 있다.Referring to FIG. 3, a power supply apparatus according to an embodiment of the present invention includes a power factor adjusting unit, and includes a delay unit 110, a controller 120, a switching element Q1, a voltage detector 130, and a power factor adjusting unit. A soft start circuit including a potential adjusting section 140 is provided.

상기 지연부(110)는 외부로부터 교류전원이 인가되면 일정레벨의 전압이 입력되는 전압입력단(VCC)을 통해 입력되는 전압을 충전하도록 병렬 연결된 복수의 캐패시터(Ca, Cb)와 저항(Ra, Rb)으로 구성되어 있다. The delay unit 110 includes a plurality of capacitors Ca and Cb and resistors Ra and Rb connected in parallel to charge a voltage input through a voltage input terminal VCC to which a predetermined level of voltage is input when AC power is applied from the outside. )

상기 제어부(120)는 지연부(110)를 통해 충전된 전압 즉, Comp단의 전압을 설정전압과 비교하여 설정전압 이상이면 스위칭소자(Q1)을 구동하여 장치 내로 구동전원이 인가되도록 제어한다.The controller 120 controls the driving power to be applied to the device by driving the switching element Q1 when the voltage charged through the delay unit 110, that is, the voltage at the Comp terminal is greater than or equal to the set voltage.

상기 전압검출부(130)는 외부로부터 교류전원이 입력되는 교류전원입력단(Vin)과, 교류전원입력단(Vin)에 그 일단이 연결된 제1 저항(R1)과, 그 일단이 제1 저항(R1)의 타단에 연결되고 그 타단이 그라운드단에 연결된 제2 저항(R2)과, 그 일단이 제1 저항(R1)의 타단과 제2 저항(R2)의 일단에 공통 연결되고 그 타단이 그라운드단에 연결된 캐패시터(C1)와, 그 일단이 제1 저항(R1)의 타단과 제2 저항(R2)의 일단 및 캐패시터(C1)의 일단에 공통 연결되고 타단이 전위조절부(140)에 연결된 제3 저항(R3)을 포함한다.The voltage detector 130 includes an AC power input terminal Vin to which AC power is input from the outside, a first resistor R1 connected to one end of the AC power input terminal Vin, and one end of the first resistor R1. A second resistor R2 connected to the other end of the second resistor R2 connected to the ground terminal, and one end thereof is commonly connected to the other end of the first resistor R1 and one end of the second resistor R2, and the other end thereof to the ground terminal. A third capacitor connected to the capacitor C1, one end of which is commonly connected to the other end of the first resistor R1, one end of the second resistor R2, and one end of the capacitor C1, and the other end of which is connected to the potential controller 140. Resistor R3.

상기 전위조절부(140)는 레퍼런스(R)단이 전압검출부(130)의 제3 저항(R3)의 타단에 연결되고 캐소드(K)단이 전압입력단(VCC)에 연결되며 애노드(A)단이 그라운드단에 연결되는 션트 레귤레이터(Shunt Regulator)(U1)와, 그 일단이 전압입력단(VCC)에 연결되고 그 타단이 션트 레귤레이터(U1)의 캐소드(K)단에 연결된 제4 저항(R4)을 포함한다.The potential controller 140 has a reference (R) terminal connected to the other end of the third resistor (R3) of the voltage detector 130, and a cathode (K) terminal connected to the voltage input terminal (VCC), and an anode (A) terminal. A shunt regulator U1 connected to the ground terminal and a fourth resistor R4 connected at one end thereof to the voltage input terminal VCC and at the other end thereof connected to the cathode K end of the shunt regulator U1. It includes.

그리고, 전위조절부(140)는 그 일단이 제4 저항(R4)의 타단과 션트 레귤레이터(U1)의 캐소드(K)단에 공통 연결된 제5 저항(R5)과, 그 일단이 제5 저항(R5)의 타단에 연결되고 그 타단이 그라운드단에 연결된 제6 저항(R6) 및, 그 베이스단이 제5 저항(R5)의 타단과 제6 저항(R6)의 일단에 연결되고 그 이미터단이 comp단에 연결되며 그 컬렉터단이 그라운드단에 연결된 트랜지스터(Q2)를 포함한다.The potential controller 140 includes a fifth resistor R5 having one end connected in common to the other end of the fourth resistor R4 and the cathode K end of the shunt regulator U1, and one end of the potential resistor 140 having a fifth resistor ( The sixth resistor R6 connected to the other end of R5 and the other end thereof to the ground end, and the base end thereof are connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6, and the emitter end thereof is It is connected to the comp terminal and its collector stage includes a transistor Q2 connected to the ground terminal.

이제 상기와 같이 구성된 본 발명의 일실시예에 대한 작용 효과를 첨부된 도면을 참조하여 설명하기로 한다.With reference to the accompanying drawings will now be described the operation and effect of the embodiment of the present invention configured as described above.

딥-업 테스트에서 업 시(파워 온 시) 외부로부터 입력되는 교류전압이 전압검출부(130)에서 분압되어 전위조절부(140)의 션트 레귤레이터(U1)의 레퍼런스(R)단으로 입력되고 션트 레귤레이터(U1)의 동작에 의해 트랜지스터(Q2)는 턴오프상태를 유지한다.In the dip-up test, the AC voltage input from the outside (up on power) is divided by the voltage detector 130 and input to the reference (R) terminal of the shunt regulator (U1) of the potential controller 140, and the shunt regulator is input. By the operation of U1, the transistor Q2 is kept turned off.

이때, 전압입력단(Vcc)의 전압이 지연부(110)의 캐패시터(Cb)에서 충전되고 캐패시터(Cb)의 전압이 설정전압 이상이되는 지연시간 경과 후 제어부(120)는 스위칭소자(Q1)을 구동하여 장치 내로 구동전원이 인가되도록 제어한다.At this time, the controller 120 drives the switching element Q1 after a delay time when the voltage of the voltage input terminal Vcc is charged in the capacitor Cb of the delay unit 110 and the voltage of the capacitor Cb becomes greater than or equal to the set voltage. To control the driving power.

딥 시(파워 오프 시)에는, 전압검출부(130)에서 전위조절부(140)의 션트 레 귤레이터(U1)의 레퍼런스(R)단으로 입력되는 전압이 설정전압 미만이됨에 따라 션트 레귤레이터(U1)의 동작에 의해 트랜지스터(Q2)가 턴온된다.In the deep state (power off), the voltage inputted from the voltage detector 130 to the reference R terminal of the shunt regulator U1 of the potential regulator 140 becomes less than the set voltage, thereby shunt regulator U1. Transistor Q2 is turned on.

트랜지스터(Q2)가 턴온됨에 따라 comp단이 그라운드단으로 연결되어 영(0)전위로 조절된다.As transistor Q2 is turned on, the comp terminal is connected to the ground terminal to adjust the zero potential.

따라서, 과도현상으로 comp단에 전압상승이 발생하더라도, 그 상승된 전압이 트랜지스터(Q2)를 통해 그라운드단으로 방전됨으로써 영전위를 유지할 수 있게 된다.Therefore, even if a voltage rise occurs in the comp terminal due to a transient phenomenon, the zero voltage can be maintained by discharging the increased voltage to the ground terminal through the transistor Q2.

도 4의 (a)에서 "C"로 표시된 구간에 나타난 바와 같이, 딥 시(파워 오프 시)에 과도현상으로 comp단 전압이 상승하더라도 전위조절부(140)의 영전위조절 작용에 의해 comp단 전압이 그라운드 전위로 낮춰진다.As shown in the section indicated by "C" in Fig. 4 (a), even if the comp terminal voltage rises due to a transient phenomenon during the dip (when the power off), the comp terminal by the zero potential control action of the potential control unit 140 The voltage is lowered to ground potential.

따라서, 다음번의 업 시(파워 온 시)에, 전압입력단(Vcc)의 전압이 지연부(110)의 캐패시터(Cb)에서 충전되는 시간만큼 지연시간을 가진 후 제어부(120)가 스위칭소자(Q1)를 구동하여 장치 내로 구동전원이 인가되도록 제어하는 소프트 스타트 동작이 정상적으로 수행된다.Therefore, at the next up time (power on), after the voltage of the voltage input terminal Vcc has a delay time as long as it is charged by the capacitor Cb of the delay unit 110, the controller 120 switches the switching element Q1. ), The soft start operation of controlling driving power to be applied into the apparatus is normally performed.

도 4의 (b)에서 "D"로 표시된 구간에 나타난 바와 같이, 소프트 스타트 동작으로 인해 역률조정부의 인덕터에서 상승하는 전류치가 제한되면서 포화현상이 발생되지 않음을 알 수 있다.As shown in the section indicated by "D" in Figure 4 (b), it can be seen that the saturation does not occur while the current value rising in the inductor of the power factor adjusting unit is limited due to the soft start operation.

참고적으로, 도 4에서 W1은 역률조정부의 출력전압 측정파형, W2는 소프트스타트 회로의 comp단 전압 측정파형, W3, W4는 역률조정부의 인덕터 전류 측정파형이다.For reference, in FIG. 4, W1 is an output voltage measurement waveform of the power factor adjusting unit, W2 is a comp voltage measurement waveform of the comp terminal of the soft start circuit, and W3 and W4 are inductor current measurement waveforms of the power factor adjusting unit.

이와 같이, 본 발명의 상세한 설명에서는 구체적인 실시 예(들)에 관해 설명하였으나, 본 발명의 범주에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함은 물론이다. As described above, in the detailed description of the present invention, specific embodiment (s) have been described, but various modifications are possible without departing from the scope of the present invention.

그러므로 본 발명의 범위는 설명된 실시 예(들)에 국한되어 정해져서는 안 되며, 후술하는 특허청구범위 뿐만 아니라 이 특허청구범위와 균등한 것들에 의해 정해져야 한다.Therefore, the scope of the present invention should not be limited to the described embodiment (s), but should be defined by the claims below and equivalents thereof.

본 발명은 파워 오프 시에 소프트 스타트 회로의 전위를 영전위로 조절함으로써, 딥-업 테스트 시 과도현상으로 딥 시에 소프트 스타트 회로의 전압이 상승함에 따른 소프트 스타트 회로의 오동작을 방지할 수 있는 효과가 있다.According to the present invention, by controlling the potential of the soft start circuit to zero potential during power-off, it is possible to prevent a malfunction of the soft start circuit due to a transient voltage increase during the dip-up test. have.

Claims (4)

전원공급장치에 있어서, In the power supply, 입력되는 전압을 충전하는 지연부; A delay unit for charging an input voltage; 상기 지연부에서 충전된 전압이 설정전압 이상이 되면 상기 충전된 전압으로 구동전원을 인가하는 제어부; A controller configured to apply driving power to the charged voltage when the voltage charged by the delay unit is equal to or higher than a set voltage; 외부로부터 입력되는 교류전압의 레벨을 검출하는 전압검출부; A voltage detector detecting a level of an AC voltage input from the outside; 상기 전압검출부에서 검출되는 교류전압의 레벨에 따라 상기 지연부에 충전되는 전압의 전위를 조절하는 전위조절부를 포함하는 전원공급장치의 소프트 스타트회로.And a potential adjusting unit for adjusting the potential of the voltage charged in the delay unit according to the level of the AC voltage detected by the voltage detecting unit. 제 1항에 있어서, 상기 전압검출부는 The method of claim 1, wherein the voltage detector 외부로부터 교류전원이 입력되는 교류전원입력단과, AC power input terminal for inputting AC power from the outside, 상기 교류전원입력단에 그 일단이 연결된 제1 저항과, A first resistor having one end connected to the AC power input terminal; 그 일단이 상기 제1 저항의 타단에 연결되고 그 타단이 그라운드단에 연결된 제2 저항과, A second resistor having one end connected to the other end of the first resistor and the other end connected to the ground end; 그 일단이 상기 제1 저항의 타단과 상기 제2 저항의 일단에 공통 연결되고 그 타단이 그라운드단에 연결된 캐패시터와, A capacitor having one end connected in common to the other end of the first resistor and one end of the second resistor, and the other end connected to the ground end; 그 일단이 상기 제1 저항의 타단과 상기 제2 저항의 일단 및 상기 캐패시터 의 일단에 공통 연결되고 타단이 상기 전위조절부에 연결된 제3 저항을 포함하는 전원공급장치의 소프트 스타트회로.And a third resistor, one end of which is commonly connected to the other end of the first resistor, one end of the second resistor, and one end of the capacitor, and the other end of which is connected to the potential regulating unit. 제 1항 또는 제 2항에 있어서, 상기 전위조절부는 The method of claim 1 or 2, wherein the potential adjusting unit 레퍼런스단이 상기 전압검출부에 연결되고 캐소드단이 전압입력단에 연결되며 애노드단이 그라운드단에 연결되는 션트 레귤레이터와, A shunt regulator having a reference end connected to the voltage detector, a cathode end connected to a voltage input end, and an anode end connected to a ground end; 상기 션트 레귤레이터의 동작에 따라 인가되는 구동전압에 의해 스위칭 온되어 상기 지연부를 그라운드단으로 연결하는 스위칭소자를 포함하는 전원공급장치의 소프트 스타트회로.And a switching device which is switched on by a driving voltage applied according to the operation of the shunt regulator and connects the delay unit to the ground terminal. 제 1항에 있어서, 상기 전위조절부는 According to claim 1, wherein the potential adjusting unit 상기 전압검출부에서 검출되는 교류전압의 레벨이 설정레벨 미만이면 상기 지연부의 전위를 영(0)전위로 낮추는 것을 특징으로 하는 전원공급장치의 소프트 스타트회로.And the potential of the delay unit is reduced to zero potential when the level of the AC voltage detected by the voltage detector is less than a set level.
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KR970031300A (en) * 1995-11-22 1997-06-26 배순훈 A circuit for starting softly the power circuit
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KR20060056700A (en) * 2004-11-22 2006-05-25 동양이엔피 주식회사 Switching mode power supply having soft start features
KR20080114309A (en) * 2007-06-27 2008-12-31 삼성에스디아이 주식회사 Soft start circuit and power supply including the circuit

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KR970031300A (en) * 1995-11-22 1997-06-26 배순훈 A circuit for starting softly the power circuit
KR20020055832A (en) * 2000-12-29 2002-07-10 장호석 Switching mode power supply
KR20060056700A (en) * 2004-11-22 2006-05-25 동양이엔피 주식회사 Switching mode power supply having soft start features
KR20080114309A (en) * 2007-06-27 2008-12-31 삼성에스디아이 주식회사 Soft start circuit and power supply including the circuit

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