KR20060089811A - Regulation circuit for switching current limit level - Google Patents

Regulation circuit for switching current limit level Download PDF

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KR20060089811A
KR20060089811A KR1020050010574A KR20050010574A KR20060089811A KR 20060089811 A KR20060089811 A KR 20060089811A KR 1020050010574 A KR1020050010574 A KR 1020050010574A KR 20050010574 A KR20050010574 A KR 20050010574A KR 20060089811 A KR20060089811 A KR 20060089811A
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resistor
voltage
switching current
connection point
limiting
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KR1020050010574A
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Korean (ko)
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KR101071888B1 (en
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한경태
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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
    • 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
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit

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

Abstract

본 발명의 목적은 입력전원을 균일화시켜 클램프전압이 유동되지 않도록 하는 스위칭 전류 제한 회로를 제공하기 위한 것이다. It is an object of the present invention to provide a switching current limiting circuit that equalizes an input power source so that a clamp voltage does not flow.

상기 목적을 달성하기 위한 본 발명의 구성의 특징은 전원선과 접지 간에 순차적으로 직렬로 설치되는 전류를 제한하는 제 1 저항, 전원전압에 비례하는 분압저항을 발생시키는 제 2 저항, 제 3 저항; 상기 제 1 저항과 상기 제 2 저항의 접속점과 접지 간에 설치되며, 상기 접속점의 전위에 비례하여 비례전류를 도통시키는 션트 레귤레이터(shunt regulator); 상기 제 2 저항과 상기 제 3 저항의 접속점과 상기 PWM IC의 스위칭 전류를 제한하기 위한 클램핑 전압이 인가되는 루프 보상핀(Vc) 사이에 연결되는 제너 다이오드를 포함하는 것이다.Features of the present invention for achieving the above object is a first resistor for limiting the current sequentially installed in series between the power supply line and ground, a second resistor for generating a voltage divider proportional to the power supply voltage; A shunt regulator provided between a connection point of the first resistor and the second resistor and a ground and conducting a proportional current in proportion to the potential of the connection point; And a Zener diode connected between a connection point of the second resistor and the third resistor and a loop compensation pin Vc to which a clamping voltage for limiting a switching current of the PWM IC is applied.

전류제한, 클램프, 제너다이오드Current Limit, Clamp, Zener Diode

Description

스위칭 전류 제한회로{ regulation circuit for switching current limit level}Regulation circuit for switching current limit level

도 1은 종래의 스위칭 전류 제한회로를 설명하기 위한 회로도이다.1 is a circuit diagram illustrating a conventional switching current limiting circuit.

도 2는 본 발명의 일실시예를 설명하기 위한 회로도이다.2 is a circuit diagram for explaining an embodiment of the present invention.

본 발명은 DC 입력전압의 라인 레귤레이션( Line Regulation) 특성을 향상시켜 스위칭 전류 제한레벨을 안정화시키는 회로이다.The present invention is a circuit for stabilizing the switching current limit level by improving the line regulation characteristics of the DC input voltage.

전원회로를 구성하기 위해서는 펄스폭을 변조하기 위한 PWM IC가 통상적으로 사용되고, PWM IC 내에는 파워트랜지스터가 설치되나, 이러한 파워 트랜지스터는 내부 또는 외부에서 발생되는 스위칭시 발생되는 과도전류에 의하여 소손되는 경우가 발생하기 때문에 스위칭 전류를 제한하는 보호회로를 구성하여 파워 트랜지스터를 보호한다.A PWM IC for modulating the pulse width is commonly used to construct a power supply circuit, and a power transistor is installed in the PWM IC, but such a power transistor is burned out by a transient current generated during switching generated internally or externally. Is generated to protect the power transistor by configuring a protection circuit to limit the switching current.

도 1은 종래의 스위칭 전류 제한회로를 설명하기 위한 회로도이다.1 is a circuit diagram illustrating a conventional switching current limiting circuit.

통상적인 PWM IC에는 전원(Vin)이 인가되는 전원핀(Vcc)과 배부의 파워트랜지스터에 과도전류를 제한하기 위하여 클램프 전압이 인가되는 루프 보상핀(Vc)를 구비한다. 또한, 루프 보상핀(Vc)에는 전원(Vin)이 저항(R2), 저항(R3)에 의하여 분압되는 분압저항V(R3)와 제너다이오드(D1)에 인가되는 전압V(D1)의 합 전압이 클램프 전압으로 인가되게 된다. A typical PWM IC includes a power supply pin (Vcc) to which a power supply (Vin) is applied and a loop compensation pin (Vc) to which a clamp voltage is applied to limit a transient current to a power transistor of a distribution. In addition, the loop compensation pin Vc has the sum of the voltage V (D1) applied to the zener diode D1 and the voltage dividing resistor R3 in which the power supply Vin is divided by the resistor R2 and the resistor R3. This clamp voltage is applied.

이와 같은 구성의 제한전류 시스템에서 클램프 전압을 이루고 있는 분압저항V(R3)는 입력 전원(Vin)에 의하여 유동되기 때문에 정확히 스위칭 시에 발생되는 과도전류를 제어할 수 없는 문제점이 존재한다.In the limited current system having such a configuration, since the voltage dividing resistor V R3 constituting the clamp voltage flows by the input power supply Vin, there is a problem in that it is impossible to accurately control the transient current generated during switching.

본 발명은 이러한 문제점을 해결하기 위한 것으로, 본 발명의 목적은 입력전원을 균일화시켜 클램프전압이 유동되지 않도록 하는 스위칭 전류 제한 회로를 제공하기 위한 것이다. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a switching current limiting circuit which equalizes an input power supply so that a clamp voltage does not flow.

상기 목적을 달성하기 위한 본 발명의 특징은 입력전원을 인가받아 소정의 펄스신호를 출력하는 PWM IC의 스위칭 전류를 제한하기 위한 스위칭 전류 제한 회로에 있어서: 상기 전원선과 접지 간에 순차적으로 직렬로 설치되는 전류를 제한하는 제 1 저항, 전원전압에 비례하는 분압저항을 발생시키는 제 2 저항, 제 3 저항; 상기 제 1 저항과 상기 제 2 저항의 접속점과 접지 간에 설치되며, 상기 접속점의 전위에 비례하여 비례전류를 도통시키는 션트 레귤레이터(shunt regulator); 상기 제 2 저항과 상기 제 3 저항의 접속점과 상기 PWM IC의 스위칭 전류를 제한하기 위한 클램핑 전압이 인가되는 루프 보상핀(Vc) 사이에 연결되는 제너 다이오드를 포함하는 것이다.A feature of the present invention for achieving the above object is a switching current limiting circuit for limiting a switching current of a PWM IC that receives an input power supply and outputs a predetermined pulse signal, which is sequentially installed in series between the power supply line and ground. A first resistor for limiting current, a second resistor for generating a voltage divider resistor proportional to the power supply voltage, and a third resistor; A shunt regulator provided between a connection point of the first resistor and the second resistor and a ground and conducting a proportional current in proportion to the potential of the connection point; And a Zener diode connected between a connection point of the second resistor and the third resistor and a loop compensation pin Vc to which a clamping voltage for limiting a switching current of the PWM IC is applied.

이하, 첨부된 도면에 따라서 본 발명의 일실시예를 상세히 설명하기로 한다.Hereinafter, an embodiment of the present invention according to the accompanying drawings will be described in detail.

도 2는 본 발명의 일실시예를 설명하기 위한 회로도이다.2 is a circuit diagram for explaining an embodiment of the present invention.

입력전원(Vin)은 PWM IC의 전원핀(Vcc)에 입력되어 PWM IC로부터 소정의 펄스신호가 출력되게 된다. PWM IC에는 스위칭 과도전류를 제한하기 위하여 클램프 전압이 설정되는 루프 보상핀(Vc)을 구비한다. 루프 보상핀(Vc)에 클램프 전압을 설정하기 위하여 입력전원단과 접지사이에는 저항(R14), (R12), (R13)이 순차적으로 직렬 연결되며, 저항(R14)과 저항(R12)의 접속점과 접지 간에는 션트-레귤레이터(shunt-regulator)가 설치되며, 저항(R14)과 저항(R12)의 접속점의 전위가 션트-레귤레이터의 구동전원으로 공급된다. 또한, 저항(R12)과 저항(R13)의 접속점과 PWM IC의 루프 보상핀(Vc)간에는 제너다이오드(D10)가 설치되며, 루프 보상핀(Vc)과 접지 간에는 저항(R10)이 설치된다.The input power supply Vin is input to the power supply pin Vcc of the PWM IC to output a predetermined pulse signal from the PWM IC. The PWM IC has a loop compensation pin (Vc) in which the clamp voltage is set to limit the switching transients. In order to set the clamp voltage at the loop compensation pin Vc, resistors R14, R12, and R13 are sequentially connected in series between the input power terminal and ground, and the connection point of the resistors R14 and R12 is A shunt-regulator is provided between grounds, and the potential of the connection point of the resistor R14 and the resistor R12 is supplied to the driving power supply of the shunt-regulator. In addition, a zener diode D10 is provided between the connection point of the resistor R12 and the resistor R13 and the loop compensation pin Vc of the PWM IC, and a resistor R10 is provided between the loop compensation pin Vc and the ground.

상기에서 션트 - 레귤레이터는 우수한 레귤레이션의 특성을 갖는 TL431을 사용하는 것이 바람직하다.In the above shunt-regulator, it is preferable to use the TL431 having excellent regulation characteristics.

이하, 본 발명의 일실시예의 동작과정에 대하여 설명하기로 한다.Hereinafter, an operation process of an embodiment of the present invention will be described.

션트-레귤레이터는 캐소드(Cathode), 핀(Pin), 레퍼런스(Reference) 핀이 연결되어 있으므로, 입력전압(Vin)의 변동 및 과도상태시 저항(R14), 저항(R12)의 접속점의 전위가 일정하게 유지되므로 저항(R12), 저항(R13)에 의한 전압강하도 안정화된다. 또한, 루프 보상핀에 공급되는 클램핑 전압은 저항(R13)과 제너다이오드(D10)의 전압강하이나, 저항(R13)에 의한 전압강하는 저항(R12), 저항(R13)의 전압강하의 분압 값으로써 션트-레귤레이터의 동작에 의하여 안정화되게 된다. 결국, 저항(R13)에 인가되는 전압이 안정화됨으로써 클램핑 전압이 안정화되게 되어 스위칭 전류의 과도상태에서 PWM IC를 보호할 수 있게 된다.Since the shunt-regulator is connected with the cathode, pin, and reference pins, the potentials of the connection points of the resistors R14 and R12 are constant when the input voltage Vin changes or is transient. Therefore, the voltage drop caused by the resistors R12 and R13 is also stabilized. The clamping voltage supplied to the loop compensation pin is a voltage drop of the resistor R13 and the zener diode D10, or a voltage drop of the resistor R13 and the voltage drop of the resistor R12 and the resistor R13. It is then stabilized by the operation of the shunt regulator. As a result, the voltage applied to the resistor R13 is stabilized to stabilize the clamping voltage, thereby protecting the PWM IC in the transient state of the switching current.

상기의 목적과 구성을 갖는 본 발명에 따르면, PWM IC의 루프보상핀의 크램핑 전압을 안정화시켜 스위칭 전류 제한 레벨을 일정하게 유지시킬 수 있기 때문에 IC 내부의 회로소자를 보호할 수 있다.According to the present invention having the above object and configuration, it is possible to protect the circuit elements inside the IC since the clamping voltage of the loop compensation pin of the PWM IC can be stabilized to keep the switching current limit level constant.

Claims (1)

입력전원을 인가받아 소정의 펄스신호를 출력하는 PWM IC의 스위칭 전류를 제한하기 위한 스위칭 전류 제한 회로에 있어서: In a switching current limiting circuit for limiting a switching current of a PWM IC that receives an input power and outputs a predetermined pulse signal: 상기 전원선과 접지 간에 순차적으로 직렬로 설치되는 전류를 제한하는 제 1 저항, 전원전압에 비례하는 분압저항을 발생시키는 제 2 저항, 제 3 저항;A first resistor for limiting currents installed in series between the power supply line and ground, a second resistor for generating a voltage divider proportional to a power supply voltage; 상기 제 1 저항과 상기 제 2 저항의 접속점과 접지 간에 설치되며, 상기 접속점의 전위에 비례하여 비례전류를 도통시키는 션트 레귤레이터(shunt regulator); A shunt regulator provided between a connection point of the first resistor and the second resistor and a ground and conducting a proportional current in proportion to the potential of the connection point; 상기 제 2 저항과 상기 제 3 저항의 접속점과 상기 PWM IC의 스위칭 전류를 제한하기 위한 클램핑 전압이 인가되는 루프 보상핀(Vc) 사이에 연결되는 제너 다이오드를 포함하는 것을 특징으로 하는 스위칭 전류 제한 회로.And a Zener diode connected between a connection point of the second resistor and the third resistor and a loop compensation pin Vc to which a clamping voltage for limiting the switching current of the PWM IC is applied. .
KR1020050010574A 2005-02-04 2005-02-04 regulation circuit for switching current limit level KR101071888B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8415891B2 (en) * 2007-07-03 2013-04-09 Fairchild Korea Semiconductor, Ltd. Lamp ballast circuit and driving method thereof
KR101289326B1 (en) * 2010-04-06 2013-07-24 오스람 게엠베하 Power supply device for light sources, such as halogen lamps, and related method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000339046A (en) 1999-05-26 2000-12-08 Canon Inc Shunt regulator
US6885530B2 (en) 2002-06-11 2005-04-26 Stmicroelectronics, Inc. Power limiting time delay circuit
JP2004139450A (en) 2002-10-18 2004-05-13 Koito Mfg Co Ltd Voltage clamping circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8415891B2 (en) * 2007-07-03 2013-04-09 Fairchild Korea Semiconductor, Ltd. Lamp ballast circuit and driving method thereof
KR101289326B1 (en) * 2010-04-06 2013-07-24 오스람 게엠베하 Power supply device for light sources, such as halogen lamps, and related method
US8502518B2 (en) 2010-04-06 2013-08-06 Osram Gesellschaft Mit Beschraenkter Haftung Power supply device for light sources, such as halogen lamps, and related method

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