KR970022328A - Current Sense Circuit with Noise Filter - Google Patents

Current Sense Circuit with Noise Filter Download PDF

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Publication number
KR970022328A
KR970022328A KR1019950034875A KR19950034875A KR970022328A KR 970022328 A KR970022328 A KR 970022328A KR 1019950034875 A KR1019950034875 A KR 1019950034875A KR 19950034875 A KR19950034875 A KR 19950034875A KR 970022328 A KR970022328 A KR 970022328A
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South Korea
Prior art keywords
noise
current sensing
control signal
turn
present
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KR1019950034875A
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Korean (ko)
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KR0154845B1 (en
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최낙춘
서맹호
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김광호
삼성전자 주식회사
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Priority to KR1019950034875A priority Critical patent/KR0154845B1/en
Publication of KR970022328A publication Critical patent/KR970022328A/en
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Publication of KR0154845B1 publication Critical patent/KR0154845B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Noise Elimination (AREA)
  • Networks Using Active Elements (AREA)

Abstract

본 발명은 잡음 필터를 갖는 전류 감지 회로에 관한 것으로, 제어 신호에 의해서 온/오프되는 스위칭 수단과, 상기 스위칭 수단을 통해서 흐르는 전류를 감지하는 전류 감지 수단과, 상기 전류 감지 수단 양단에 인가되는 전압에 포함되어 있는 스위칭 수단의 턴-온 잡음 성분을 완전히 제거하기 위해 턴-온 잡음이 존재하는 구간 동안은 ‘로우’, 턴-온 잡음이 존재하지 않는 구간 동안은‘하이’ 상태의 제어 신호를 발생시켜 잡음으로 인한 오차를 보상할 수 있도록 설계된 오차 보상 수단과, 상기 전류 감지 수단 양단에 인가되는 전압과 2차측 피드백 입력단 전압을 각각 비반전, 반전 입력으로 받아 비교한 후, 상기 오차 보상 수단으로부터 출력되는 제어 신호에 의해서 제어 신호가 ‘하이’일 때만 비교 결과 신호를 출력하도록 설계된 제1비교 수단으로 구성되었으며, 잡음으로 인한 이상 동작을 제거하고, 잡음 제거를 위해 설계된 알씨 필터로 인해 발생되는 오차 감지 전압을 보상시킬 수 있도록 설계된 잡음 필터를 갖는 전류 감지 회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current sensing circuit having a noise filter, the switching means being turned on / off by a control signal, the current sensing means for sensing the current flowing through the switching means, and the voltage applied across the current sensing means. In order to completely remove the turn-on noise component of the switching means included in the control section, the control signal is 'low' during the period when the turn-on noise is present and 'high' during the period when the turn-on noise is not present. Error compensating means designed to compensate for errors caused by noise, and voltages applied across the current sensing means and secondary feedback input terminal voltages as non-inverting and inverting inputs, respectively, and then compared with each other. First comparison means designed to output a comparison result signal only when the control signal is 'high' by the output control signal The present invention relates to a current sensing circuit having a noise filter designed to eliminate abnormal operation caused by noise and to compensate for an error sensing voltage caused by an RF filter designed for noise removal.

Description

잡음 필터를 갖는 전류 감지 회로Current Sense Circuit with Noise Filter

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 종래 잡음 필터를 갖는 전류 감지 회로를 나타낸 회로도이고,1 is a circuit diagram showing a current sensing circuit having a conventional noise filter,

제2도는 본 발명의 실시예에 잡음 필터를 갖는 전류 감지 회로를 나타낸 회로도이고,2 is a circuit diagram showing a current sensing circuit having a noise filter in an embodiment of the present invention,

제3도의 (a)∼(d)는 본 발명의 실시예에 따른 잡음 필터를 갖는 전류 감지 회로의 제어 파형도이다.3A to 3D are control waveform diagrams of a current sensing circuit having a noise filter according to an embodiment of the present invention.

Claims (5)

제어 신호에 의해서 온/오프되는 스위칭 수단과; 상기 스위칭 수단을 통해서 흐르는 전류를 감지하는 전류 감지 수단과; 상기 전류 감지 수단 양단에 인가되는 전압에 포함되어 있는 스위칭 수단의 턴-온 잡음 성분을 완전히 제거하기 위해 턴-온 잡음이 존재하는 구간 동안은 ‘로우’, 턴-온 잡음이 존재하지 않는 구간 동안은 ‘하이’ 상태의 제어 신호를 발생시켜 잡음으로 인한 오차를 보상할 수 있도록 설계된 오차 보상 수단과; 상기 전류 감지 수단 양단에 인가되는 전압과 2차측 피드백 입력단 전압을 각각 비반전, 반전 입력으로 받아 비교한 후, 상기 오차 보상 수단으로부터 출력되는 제어 신호에 의해서 제어 신호가 ‘하이’일 때만 비교 결과 신호를 출력하도록 설계된 제1비교 수단을 포함하여 이루어져 있는 것을 특징으로 하는 잡음 필터를 갖는 전류 감지 회로.Switching means turned on / off by a control signal; Current sensing means for sensing a current flowing through the switching means; During the period in which the turn-on noise is present to completely remove the turn-on noise component of the switching means included in the voltage applied across the current sensing means, the signal is 'low' and during the period in which the turn-on noise is not present. An error compensating means designed to generate a 'high' state control signal to compensate for errors due to noise; After comparing the voltages applied across the current sensing means and the secondary feedback input terminal voltage as non-inverting and inverting inputs, respectively, and comparing the result signal only when the control signal is 'high' by the control signal output from the error compensating means. And a first comparing means designed to output the noise sensing circuit having a noise filter. 제1항에 있어서, 상기 전류 감지 수단은 저항으로 이루어져 있는 것을 특징으로 하는 잡음 필터를 갖는 전류 감지 회로.A current sensing circuit with a noise filter as claimed in claim 1, wherein said current sensing means consists of a resistor. 제1항에 있어서, 상기 오차 보상 수단은, 상기 전류 감지 수단 양단에 인가되는 전압에 오프셋 전압을 더해주는 오프셋 전원과; 상기 오프셋 전압이 더해진 전압에 포함되어 있는 잡음 성분을 완만하게 조절하는 필터링 수단과; 상기 필터링 수단을 거친 신호 전압과 상기 전류 감지 수단 양단에 인가되는 전압을 각각 비반전, 반전 입력으로 받아 비교함으로써, 턴-온 잡음이 존재하는 구간 동안은 ‘로우’, 턴-온 잡음이 존재하지 않는 구간 동안은 ‘하이’ 상태의 제어 신호를 발생시키는 제2비교 수단을 포함하여 이루어져 있는 것을 특징으로 하는 잡음 필터를 갖는 전류 감지 회로.2. The apparatus of claim 1, wherein the error compensating means comprises: an offset power supply for adding an offset voltage to a voltage applied across the current sensing means; Filtering means for gently adjusting a noise component included in the voltage to which the offset voltage is added; The signal voltage passed through the filtering means and the voltage applied across the current sensing means are respectively received as non-inverting and inverting inputs, and thus, 'low' and turn-on noise are not present during the period in which the turn-on noise is present. And a second comparing means for generating a control signal of a 'high' state during a period of time not being used. 제3항에 있어서, 상기 필터링 수단은 커패시터로 이루어져 있는 것을 특징으로 하는 잡음 필터를 갖는 전류 감지 회로.4. A current sensing circuit with a noise filter as claimed in claim 3, wherein said filtering means consists of a capacitor. 제1항 또는 제3항에 있어서, 상기 제1비교 수단 및 제2비교 수단의 각 입력단에 n배 증폭 기능을 갖는 증폭 수단이 더 포함되는 것을 특징으로 하는 잡음 필터를 갖는 전류 감지 회로.4. The current sensing circuit according to claim 1 or 3, further comprising amplifying means having an n-times amplifying function at each input terminal of said first comparing means and second comparing means. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950034875A 1995-10-11 1995-10-11 Current detecting circuit with noise filter KR0154845B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950034875A KR0154845B1 (en) 1995-10-11 1995-10-11 Current detecting circuit with noise filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950034875A KR0154845B1 (en) 1995-10-11 1995-10-11 Current detecting circuit with noise filter

Publications (2)

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KR970022328A true KR970022328A (en) 1997-05-28
KR0154845B1 KR0154845B1 (en) 1998-12-15

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KR100662741B1 (en) * 2005-05-19 2007-01-02 이동균 Emi filter design and measuring apparatus having a compensation circuit

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