KR0111808Y1 - Compensating circuit of input current sensing - Google Patents

Compensating circuit of input current sensing Download PDF

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Publication number
KR0111808Y1
KR0111808Y1 KR2019940038303U KR19940038303U KR0111808Y1 KR 0111808 Y1 KR0111808 Y1 KR 0111808Y1 KR 2019940038303 U KR2019940038303 U KR 2019940038303U KR 19940038303 U KR19940038303 U KR 19940038303U KR 0111808 Y1 KR0111808 Y1 KR 0111808Y1
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South Korea
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input voltage
output
switching element
pulse width
amount
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KR2019940038303U
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Korean (ko)
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KR960025811U (en
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김돈식
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이형도
삼성전기 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • 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
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations

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

Abstract

전체 출력이 일정량으로 고정된 상태에서 입력 전압이 최대일때 센싱 레벨의 폭을 줄여줄여 입력 전압이 최소일때와 동일한 효과를 주는 입력 전류감지 보상회로가 개시되는바, 이는 입력 전압을 정류하는 정류부와, 피드백되는 전압에 의해 출력 듀티의 펄스폭이 결정되어 최대 출력량을 제어하는 펄스폭 변조 IC와, 상기 펄스폭 변조 IC의 출력 듀티에 의해 온/오프 타임이 제어되는 메인 스위칭 소자와, 상기 메인스위칭 소자가 온되면 여자되어 입력 전압을 2자측으로 유지시키는 트랜스와, 상기 메인 스위칭 소자가 온되면 상기 메인 스위칭 소자로 흐르는 입력 전압 대비 전류량을 감지하여 피드백 라인을 통해 상기 PWM IC로 피드백시키는 저항과, 상기 정류부의 출력단과 상기 펄스폭 변조 IC의 피드백 라인사이에 연결되어 입력 전압이 높아질수록 기준 레벨을 상승시키는 제2 저항으로 구성되어, 전체 출력이 일정량으로 고정된 상태에서 입력 전압이 최대일때 기준 레벨을 상승시켜 센싱 레벨의 폭을 줄여줌으로써, 간단한 회로 구성으로 입력 전압이 높을때 입력측에서 초대 출력량을 제어하여 안정된 최대 출력량을 보장한다.An input current sensing compensation circuit is disclosed, which reduces the width of the sensing level when the input voltage is maximum while the entire output is fixed to a certain amount, and has the same effect as when the input voltage is minimum. A pulse width modulation IC for controlling the maximum output amount by determining the pulse width of the output duty by the voltage fed back, a main switching element whose on / off time is controlled by the output duty of the pulse width modulation IC, and the main switching element A transformer that is excited when it is turned on to maintain an input voltage at two sides, a resistor that senses an amount of current compared to an input voltage flowing to the main switching element when the main switching element is turned on, and feeds it back to the PWM IC through a feedback line; Connected between the output terminal of the rectifier and the feedback line of the pulse width modulation IC, the higher the input voltage is, It consists of a second resistor that raises the quasi-level, and increases the reference level when the input voltage is maximum while the entire output is fixed in a fixed amount, thereby reducing the width of the sensing level. The super power output is controlled to ensure a stable maximum output.

Description

입력 전류감지 보상회로Input current sensing compensation circuit

제1도는 종래의 입력 전류감지 보상회로도.1 is a conventional input current sensing compensation circuit diagram.

제2도는 본 고안에 따른 입력 전류감지 보상회로도이다.2 is an input current sensing compensation circuit diagram according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

101 : 정류부 103 : PWM IC101: rectifier 103: PWM IC

R1~R4 : 저항 FET : 전계 효과 트랜지스터R1 ~ R4: Resistor FET: Field Effect Transistor

C1 : 콘덴서 T1 : 트랜스C1: condenser T1: transformer

본 고안은 입력 전류감지 보상회로에 관한 것으로서, 더욱 상세하게는 전체 출력이 일정량으로 고정된 상태에서 입력전압이 최대일때 센싱 레벨의 폭을 줄여줄여 입력 전압이 최소일때와 동일한 효과를 주는 입력 전류감지 보상회로에 관한 것이다.The present invention relates to an input current sensing compensation circuit, and more particularly, to reduce the width of the sensing level when the input voltage is maximum while the entire output is fixed in a certain amount, thereby providing the same effect as the input voltage is minimum. It relates to a compensation circuit.

제1도는 종래의 입력 전류감지 보상회로도이다.1 is a conventional input current sensing compensation circuit diagram.

제1도를 보면, 입력 전압이 정류부(101)에 의해 정류된 후 트랜스(T1)의 1차측에 인가된다.Referring to FIG. 1, the input voltage is rectified by the rectifying unit 101 and then applied to the primary side of the transformer T1.

또한, 소정의 듀티비를 갖는 펄스를 출력하는 펄스폭 변조(Pulse Width Modulation ; 이하, PWM이라 칭함.) IC의 제어에 의해 메인 스위칭 소자인 전계 효과 트랜지스터(Field Effect Tzransistor ; 이하, FET라 칭함.)가 저항(R1)을 통해 턴온되면 트랜스(T1)와 FET를 통해 흐르는 입력 전압에 따른 전류량을 상기 FET의 소오스단과 저항(R3) 상의 접점 a에서 감지하여 PWM IC(103)의 피드백단(3)으로 저항(R2)을 통해 피드백한다.In addition, a pulse width modulation (hereinafter referred to as PWM) for outputting a pulse having a predetermined duty ratio is referred to as a field effect transistor (Field Effect Tzransistor) hereinafter referred to as a main switching element under control of an IC. ) Is turned on through the resistor R1, the amount of current according to the input voltage flowing through the transformer T1 and the FET is sensed at the source terminal of the FET and the contact a on the resistor R3, so that the feedback terminal 3 of the PWM IC 103 is detected. Is fed back through resistor R2.

따라서, 상기 PWM IC(103)는 피드백단(3)으로 제공되는 전류량에 따라 출력단(6)을 통해 출력되는 펄스의 폭을 변화시켜 전체 출력량을 제어한다.Accordingly, the PWM IC 103 controls the total output amount by changing the width of the pulse output through the output terminal 6 according to the amount of current provided to the feedback terminal 3.

즉, 입력 전압(Vin)이 낮을때(예컨대, 90V)는 FET의 소모스단(a)에서 전류량이 많이 감지되므로 PWM IC(103)에서 출력되는 펄스폭이 넓어지고, 입력 전압(Vin)이 높을때(예컨대, 135V)는 상기 FET의 소오스단(a)에서 전류량이 적게 감지되므로 PWM IC(103)에서 출력되는 펄스폭이 좁아져 최종 출력 전압을 제어한다.That is, when the input voltage Vin is low (for example, 90 V), a large amount of current is sensed at the consumption stage a of the FET, so that the pulse width output from the PWM IC 103 is widened, and the input voltage Vin is high. At a time (eg, 135 V), since a small amount of current is sensed at the source terminal a of the FET, the pulse width output from the PWM IC 103 is narrowed to control the final output voltage.

그러나, 상기된 제1도는 상기 FET의 소오스단(a)에서 감지되는 전류량이 입력 전압(Vin)이 최저에서 최대로 변화할시 역시 반비례적으로 변화하여 최대 출력량 역시 함께 변화를 가져온다.However, in FIG. 1, when the amount of current sensed at the source terminal a of the FET changes from the lowest to the highest input voltage, it also changes in inverse proportion, resulting in a change in the maximum output amount.

즉, 입력 전압이 최소할때와 최대일때 FET의 소오스단에서 감지되는 전류량의 감지폭이 커서 전류 감지가 잘 이루어지지 않아 전류 리미터를 제대로 수행하지 못하므로 과전류 보호 회로에 안정을 주지 못하게 되어 과전류 보호 회로가 오동작하는 문제점이 있었다.In other words, when the input voltage is minimum and maximum, the detection width of the amount of current detected at the source terminal of the FET is large, so the current limiter does not perform well and the current limiter is not properly performed. There was a problem that the circuit malfunctioned.

이 고안은 상기와 같은 문제점을 해결하기 위한 것으로서, 이 고안의 목적은 입력단과 PWM IC의 피드백단사이에 저항을 연결함으로써, 전체 출력이 일정량으로 고정된 상태에서 입력 전압이 최대일때 센싱 레벨의 폭을 줄여주어 입력 전압이 최소일때와 감지 전류량을 비슷하게 해주어 전류 리미트를 정확하게 행하는 입력전류감지 보상회로를 제공함에 있다.The present invention is to solve the above problems, and the object of the present invention is to connect a resistor between the input terminal and the feedback terminal of the PWM IC, so that the width of the sensing level when the input voltage is maximum while the total output is fixed in a fixed amount. By reducing the power supply, the input current sensing compensation circuit performs the current limit accurately by making the sense current similar to the minimum input voltage.

상기와 같은 목적을 달성하기 위한 이 고안에 따른 입력 전류감지 보상회로의 특징은, 입력 전압을 정류하는 정류부와, 피드백되는 전압에 의해 출력 듀티의 펄스폭이 결정되어 최대 출력량을 제어하는 펄스폭 변조 IC와, 상기 펄스폭 변조 IC의 출력 듀티에 의해 온/오프 타임이 제어되는 메인 스위칭 소자와, 상기 메인 스위칭 소자가 온되면 여자되어 입력 전압을 2차측으로 유지시키는 트랜스와, 상기 메인 스위칭 소자가 온되면 상기 메인 스위칭 소자로 흐르는 입력 전압 대비 전류량을 감지하여 피드백라인을 통해 상기 PWM IC로 피드백시키는 저항으로 구성되는 입력 전류감지 보호회로에 있어서, 상기 정류부의 출력단과 상기 펄스폭 변조 IC의 피드백라인사이에 저항을 연결하여 입력 전압이 높아질수록 피드백 전압을 보상하여 기준 레벨을 상승시키는데 있다.A feature of the input current sensing compensation circuit according to the present invention for achieving the above object is a pulse width modulation for controlling the maximum output amount by determining the pulse width of the output duty is determined by the rectifier for rectifying the input voltage and the voltage fed back An IC, a main switching element whose on / off time is controlled by an output duty of the pulse width modulation IC, a transformer which is excited when the main switching element is turned on to maintain an input voltage on a secondary side, and the main switching element An input current sensing protection circuit comprising a resistor which senses an amount of current compared to an input voltage flowing to the main switching element when turned on and feeds it back to the PWM IC through a feedback line, wherein the output line of the rectifying unit and a feedback line of the pulse width modulation IC are provided. When the input voltage is increased by connecting a resistor between them, the feedback voltage is compensated to raise the reference level. I can.

이하, 이 고안에 따른 입력 전류감지 보상회로의 바람직한 일실시예에 대하여 첨부도면을 참조하여 상세히 설명한다.Hereinafter, a preferred embodiment of the input current sensing compensation circuit according to the present invention will be described in detail with reference to the accompanying drawings.

제2도는 이 고안에 따른 입력 전류감지 보상회로도이다.2 is an input current sensing compensation circuit diagram according to the present invention.

제2도를 보면, 입력 전압(Vin)을 정류하는 정류부(101)에는 트랜스(T1)의 1차측이 연결된다.Referring to FIG. 2, the primary side of the transformer T1 is connected to the rectifier 101 rectifying the input voltage Vin.

그리고, 소정의 듀티비를 갖는 펄스를 출력하는 PWM IC(103)의 출력단(6)에는 저항(R2)을 통해 메인 스위칭 소자인 FET의 게이트단이 연결된다.The gate terminal of the FET, which is the main switching element, is connected to the output terminal 6 of the PWM IC 103 that outputs a pulse having a predetermined duty ratio through the resistor R2.

이때, 상기 FET의 드레인단은 상기 트랜스(T1)의 1차측에 연결되고, 소오스단과 일측이 그라운드에 접속되는 저항(R4) 사이(a)에는 저항(R3)을 통해 상기 PWM IC(103)의 피드백단(3)이 연결되어 피드백되는 전류량에 따라 PWM IC(103)의 출력 듀티를 제어한다.At this time, the drain terminal of the FET is connected to the primary side of the transformer (T1), and between the resistor (R4) of the source terminal and one side is connected to the ground (a) of the PWM IC (103) through the resistor (R3) The feedback stage 3 is connected to control the output duty of the PWM IC 103 according to the amount of current fed back.

또한, 상기 PWM IC(103)의 피드백단(3)과 상기 정류부(101) 사이에는 저항(R1)이 연결된다.In addition, a resistor R1 is connected between the feedback terminal 3 of the PWM IC 103 and the rectifier 101.

이와 같이 구성된 이 고안은 전체 출력이 일정량으로 고정된 상태에서 입력 전압이 최소(예컨대, 90V)이고, PWM IC(103)의 제어에 의해 FET가 턴온되면 상기 FET의 소오스단(a)에서 감지되는 전류량은 최대가 되어 PWM IC(103)의 피드백단(3)으로 입력된다.In this configuration, the input voltage is minimum (for example, 90V) while the entire output is fixed in a fixed amount, and when the FET is turned on by the control of the PWM IC 103, the source terminal (a) of the FET is sensed. The maximum amount of current is input to the feedback stage 3 of the PWM IC 103.

따라서, 상기 PWM IC(103)는 출력 듀티의 펄스폭을 넓게 하여 전체 출력량을 크게 한다.Therefore, the PWM IC 103 widens the pulse width of the output duty to increase the total output amount.

한편, 입력 전압(Vin)이 최대(예컨대, 135V)이고, PWM IC(103)의 제어에 의해 FET가 턴온되면 FET의 소오스단(a)에서 감지되는 전류량은 최소가 된다.On the other hand, when the input voltage Vin is the maximum (eg, 135V) and the FET is turned on under the control of the PWM IC 103, the amount of current sensed at the source terminal a of the FET is minimum.

이때, 상기 FET의 소오스단(a)에서 감지된 전류량에 의해 PWM IC(103)로 피드백되는 피드백 라인(b)의 전위가 정류부(101)의출력 라인(e)의 전위보다 낮으므로 저항(R1)에 의해 피드백 라인(b)의 전위가 상승하여 전압 보상이 이루어진다.At this time, since the potential of the feedback line b fed back to the PWM IC 103 by the amount of current sensed at the source terminal a of the FET is lower than the potential of the output line e of the rectifier 101, the resistance R1. ), The potential of the feedback line b is raised to perform voltage compensation.

즉, 파형의 그라운드인 기준 레벨을 상승시켜줌으로써, 감지 레벨의 폭을 줄여주어 입력 전압이 최소일때와 최대일때 감지하는 전류량을 비슷하게 해준다.In other words, by increasing the reference level, which is the ground of the waveform, the width of the detection level is reduced, so that the amount of current detected when the input voltage is minimum and maximum is similar.

이와 같이 입력 전압이 높아질 수록 파형의 그라운드인 기준 레벨이 상승하여 안정된 최대 출력량 보호를 보장한다.As the input voltage increases, the reference level, which is the ground of the waveform, rises to ensure stable maximum output protection.

따라서, 정밀성을 요구하거나 꼭 필요한 경우가 아닐 경우에는 출력의 각 단에 과전류 보호 회로를 구성시키지 않아도 되므로 부품의 수가 감소하고 부품 디자인 공간면에서도 효율적이다.Therefore, when precision is required or not necessary, an overcurrent protection circuit is not required at each stage of the output, so that the number of components is reduced and the component design space is efficient.

이상에서와 같이 이 고안에 따라 입력 전류감지 보상회로에 의하면, 입력단과 PWM IC의 피드백단상에 저항을 연결하여 전체 출력이 일정량으로 고정된 상태에서 입력 전압이 최대일때 기준 레벨을 상승시켜 센싱 레벨의 폭을 줄여줌으로써, 간단한 회로 구성으로 입력 전압이 높을때 입력측에서 최대 출력량을 제어하여 입력 전압이 최소일때와 감지하는 전류량을 비슷하게 해주므로 안정된 최대 출력량을 보장하는 효과가 있다.As described above, according to the present invention, according to the input current sensing compensation circuit, by connecting a resistor on the input terminal and the feedback terminal of the PWM IC, the reference level is increased when the input voltage is maximum while the entire output is fixed in a fixed amount. By reducing the width, a simple circuit configuration controls the maximum output amount at the input side when the input voltage is high, making the amount of current sensed similar to that when the input voltage is minimum, thereby ensuring a stable maximum output amount.

Claims (1)

입력 전압을 정류하는 정류부와, 피드백되는 전압에 의해 출력 듀티의 펄스폭이 결정되어 최대 출력량을 제어하는 펄스폭 변조 IC와, 상기 펄스폭 변조 IC의 출력 듀티에 의해 온/오프 타임이 제어되는 메인 스위칭 소자와, 상기 메인 스위칭 소자가 온되면 여자되어 입력 전압을 2차측으로 유지시키는 트랜스와, 상기 메인 스위칭 소자가 온되면 상기 메인 스위칭 소자로 흐르는 입력 전압 대비 전류량을 감지하여 피드백 라인을 통해 상기 PWM IC로 피드백시키는 저항으로 구성되는 입력 전류감지 보상회로에 있어서, 상기 정류부의 출력단과 상기 펄스폭 변조 IC의 피드백 라인사이에 저항을 연결하여 입력 전압이 높아질 수록 피드백 전압을 보상하여 기준 레벨을 상승시킴을 특징으로 하는 입력 전류감지 보상회로.The pulse width modulation IC controls the maximum output amount by determining the pulse width of the output duty by the rectifying unit rectifying the input voltage, the fed back voltage, and the main on / off time controlled by the output duty of the pulse width modulation IC. A switching element, a transformer that is excited when the main switching element is turned on to maintain an input voltage to the secondary side, and detects an amount of current compared to an input voltage flowing to the main switching element when the main switching element is turned on, thereby detecting the PWM through a feedback line An input current sensing compensation circuit composed of a resistor for feeding back to an IC, comprising: connecting a resistor between an output terminal of the rectifier and a feedback line of the pulse width modulation IC to compensate a feedback voltage as the input voltage is increased, thereby raising a reference level. Input current sensing compensation circuit, characterized in that.
KR2019940038303U 1994-12-30 1994-12-30 Compensating circuit of input current sensing KR0111808Y1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101150882B1 (en) * 2010-11-02 2012-05-29 엘아이지넥스원 주식회사 Switching frequency conversion circuit of high-voltage power supply for traveling wave tube amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101150882B1 (en) * 2010-11-02 2012-05-29 엘아이지넥스원 주식회사 Switching frequency conversion circuit of high-voltage power supply for traveling wave tube amplifier

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