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WO2025159393A1 - Circuit de détection de courant pour convertisseur cc/cc isolé bidirectionnel - Google Patents

Circuit de détection de courant pour convertisseur cc/cc isolé bidirectionnel

Info

Publication number
WO2025159393A1
WO2025159393A1 PCT/KR2025/000231 KR2025000231W WO2025159393A1 WO 2025159393 A1 WO2025159393 A1 WO 2025159393A1 KR 2025000231 W KR2025000231 W KR 2025000231W WO 2025159393 A1 WO2025159393 A1 WO 2025159393A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
converter
directionality
detection circuit
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/KR2025/000231
Other languages
English (en)
Korean (ko)
Inventor
배선호
이재호
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LS Electric Co Ltd
Original Assignee
LS Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LS Electric Co Ltd filed Critical LS Electric Co Ltd
Publication of WO2025159393A1 publication Critical patent/WO2025159393A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • 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
    • 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
    • G01R19/14—Indicating direction of current; Indicating polarity of voltage
    • 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
    • G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of AC into DC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/12—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into phase shift
    • 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
    • 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
    • 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
    • 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
    • H02M3/33569—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 having several active switching elements
    • H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters

Definitions

  • the present invention relates to a current detection circuit for a bidirectional insulated DC/DC converter, and more specifically, to a circuit that measures the output current of a bidirectional insulated DC/DC converter using a current converter to control a switching element of the DC/DC converter.
  • a bidirectional isolated DC/DC converter is a device that converts direct current into alternating current using a number of switching elements, and then converts the converted alternating current back into direct current.
  • it since it has bidirectionality, it provides directionality of power conversion through switching control of each switching element.
  • the current of one output terminal (input terminal when the direction was different) was measured, the current conversion direction was recognized based on the value, and the power conversion direction was determined by differentiating the on/off time of the switching element based on the recognition result.
  • Fig. 5 is a block diagram of a current detection circuit of a conventional bidirectional insulated DC/DC converter
  • Fig. 6 is a detailed block diagram of the detection unit in Fig. 5.
  • the conventional converter (10) is configured to include a detector (20) that detects a direct current (Iout) of one output terminal and determines a timing decision signal (Vd) that controls the switching timing of the switches (S1 to S8) of the converter (10) according to the direction of the detected direct current (Iout).
  • a detector (20) that detects a direct current (Iout) of one output terminal and determines a timing decision signal (Vd) that controls the switching timing of the switches (S1 to S8) of the converter (10) according to the direction of the detected direct current (Iout).
  • the converter (10) is composed of a first converter (11) and a second converter (12) centered on a coil (13), and the first converter (11) includes a plurality of switching elements (S1, S2, S3, S4), and the second converter (12) is also composed of a plurality of switching elements (S5, S6, S7, S8).
  • the bidirectional insulated DC/DC converter has an insulated configuration using a coil (13), and a first converter (11) and a second converter (12) of the same configuration are arranged around the coil (13).
  • the first converter (11) and the second converter (12) each have a plurality of switching elements (S1 to S4, S5 to S8), and can convert and output the input DC current of the first converter (11) side to the second converter (12) side through timing control of the switching elements.
  • a plurality of switching elements may be formed of power semiconductor elements, and convert the input direct current into alternating current by the switching control, or convert the alternating current into direct current on the output side and output it.
  • the first converter (11) and the second converter (12) can be used as the input side and the output side of the current, respectively, or conversely, as the output side and the input side.
  • the switching control timing of the switching element on the input side becomes faster than that on the output side, and the timing decision signal (Vd) for controlling such control timing is determined according to the direction of the detected direct current.
  • the first converter (11) is described as the primary side (input side) and the second converter (12) is described as the secondary side (output side), but the opposite case can also be sufficiently understood.
  • the detector (20) includes a voltage comparator (21) that obtains the difference between a reference voltage (V REF ) and an output voltage (Vo) of a second converter (12), a voltage proportional controller (22) that generates a reference current (I REF ) using the comparison result of the voltage comparator (21), a current comparator (23) that compares the reference current (I REF ) with an output current (Iout) of the second converter (12), and a current proportional controller (24) that outputs a timing determination signal (Vd) according to the directionality of the output current (Iout) which is an output of the current comparator (23).
  • a voltage comparator (21) that obtains the difference between a reference voltage (V REF ) and an output voltage (Vo) of a second converter (12)
  • a voltage proportional controller (22) that generates a reference current (I REF ) using the comparison result of the voltage comparator (21)
  • a current comparator (23) that compares the reference current (I REF ) with an output
  • the detector (20) detects the output current (Iout), which is a direct current, to detect the directionality and determine the switch control timing of the switching elements (S1 to S4) of the first converter (11) and the switching elements (S5 to S8) of the second converter (12).
  • Iout the output current
  • the output current (Iout) is a positive value, it means that the converter (10) inputs current to the first converter (11) and outputs output current through the second converter (12). At this time, if the output current (Iout) changes to a negative value, it can be detected that the input side and the output side of the converter (10) having bidirectionality are switched.
  • the second converter (12) becomes the input side and the first converter (11) becomes the output side, and at this time, for current conversion, the switching control timing of the switching elements of the second converter (12) is controlled faster than the switching control timing of the switching elements of the first converter (11).
  • the detector (20) is configured to detect the output current (Iout) using a current sensor of the shunt resistor or Hall sensor type.
  • the selection of a current sensor can also be an important factor in recent power conversion devices that require high power density, including the actual sensor size and circuit complexity to be used.
  • CT current transformer
  • the problem that the present invention seeks to solve in consideration of the problems of the prior art as described above is to provide a current detection circuit that can control a bidirectional insulated DC/DC converter using a current sensor that detects alternating current.
  • the present invention aims to provide a current detection circuit capable of detecting an alternating current of unknown direction while determining the direction so as to control a DC/DC converter having bidirectionality.
  • a current detection circuit of a bidirectional insulated DC/DC converter is a circuit for detecting current of a bidirectional insulated DC/DC converter, which includes a first converter and a second converter, each of which includes a plurality of switching elements and is arranged on both sides of a coil for power conversion, and may include an AC current sensor for detecting AC current of the coil, and a detector for confirming the directionality of current power conversion from the AC current detected by the AC current sensor and outputting a timing determination signal according to the confirmed directionality.
  • the AC current sensor can detect the AC current of the coil on the first converter side or the coil on the second converter side.
  • the detector may include a rectifier that converts an AC current detected by the AC current sensor into a DC current, a directionality determination device that generates a reference current and compares the reference current with the DC current of the rectifier whose directionality has been determined, and outputs a timing determination signal according to the result, and a directionality confirmation device that confirms the directionality according to the value of the timing determination signal and gives directionality to the DC current of the rectifier.
  • the directionality confirmation device may include an encoder that confirms directionality by confirming a timing determination signal, and a multiplier that applies the directionality confirmed by the encoder to the direct current of the rectifier.
  • the encoder may be a phase shifter.
  • the present invention has the effect of improving expandability by enabling current detection using a wider variety of sensors by detecting an AC current of unknown direction from a converter unit using a CT, confirming the direction of the detected AC current, and generating a reference for switching control of a bidirectional insulated DC/DC converter.
  • FIG. 1 is a block diagram of a current detection circuit of a bidirectional insulated DC/DC converter according to a preferred embodiment of the present invention.
  • Figure 2 is a detailed block diagram of the detector in Figure 1.
  • Figure 3 is a waveform diagram of the detected AC current.
  • Figure 4 is a waveform diagram of direct current obtained by rectifying alternating current.
  • Figure 5 is a block diagram of a conventional bidirectional insulated DC/DC converter.
  • Figure 6 is a detailed block diagram of a conventional detector.
  • Directional confirmation device 230 Directional determination unit
  • first and second may be used to describe various components, but the components should not be limited by these terms. These terms may only be used to distinguish one component from another. For example, without departing from the scope of the present invention, a “first component” may be referred to as a “second component,” and similarly, a “second component” may also be referred to as a “first component.” Furthermore, singular expressions include plural expressions unless the context clearly dictates otherwise. Terms used in the embodiments of the present invention may be interpreted as having meanings commonly known to those of ordinary skill in the art, unless otherwise defined.
  • FIG. 1 is a block diagram of a current detection circuit of a bidirectional insulated DC/DC converter according to a preferred embodiment of the present invention
  • FIG. 2 is a detailed diagram of the detector.
  • the converter (100) is configured to include an AC current sensor (300) that detects an AC current (Is) of a bidirectional converter (100), and a detector (200) that confirms the directionality of the AC current (Is) detected by the AC current sensor (300) and determines a timing decision signal (Vd) that serves as a reference for controlling the converter (100).
  • an AC current sensor (300) that detects an AC current (Is) of a bidirectional converter (100)
  • a detector (200) that confirms the directionality of the AC current (Is) detected by the AC current sensor (300) and determines a timing decision signal (Vd) that serves as a reference for controlling the converter (100).
  • the above detector (200) is configured to include a rectifier (210) that converts the AC current (Is) detected by the AC current sensor (300) into a DC current, a directionality confirmation device (220) that provides directionality to the DC current converted by the rectifier (210), and a directionality determination device (230) that compares the DC current provided with directionality with a reference current and outputs a timing determination signal (Vd).
  • the converter (100) includes a first converter (110), a second converter (120), and a coil (130) between the first converter (110) and the second converter (120), and has an insulating structure by the coil (130).
  • the first converter (110) includes a plurality of switching elements (S1 to S4), and the second converter (120) is also configured to include a plurality of switching elements (S5 to S8).
  • the first converter (110) and the second converter (120) can be the input side or the output side of power conversion, respectively, or conversely, the output side or the input side.
  • the AC current sensor (300) detects the current on one side of the coil (130).
  • the AC current sensor (300) can detect the current on the first converter (110) side of the coil (130) or the current on the second converter (120) side.
  • the output current (Iout) is converted to direct current by selective switching of the switching elements (S5 to S8) of the second converter (120).
  • the same can be applied in a case where the second converter (120) acts as the input side and the first converter (110) acts as the output side.
  • the AC current sensor (300) detects the AC current (Is).
  • the detector (200) of the present invention includes a directionality confirmation device (220) that can confirm the directionality of the alternating current (Is) and apply it.
  • the direction confirmation device (220) may include an encoder (221) that checks the value of the timing signal (Vd), which is the output of the direction determination device (230), to determine whether it is a positive or negative value, and a multiplier (222) that determines the direction of the output current of the rectifier (210) using the code value of the encoder (221).
  • the rectifier (210) for converting the AC current (Is) into a DC current (I R ) in order to compare the detected AC current (Is) with a reference current (I REF ), which is a DC current.
  • the above rectifier (210) includes a rectifier (211) to convert alternating current (Is) into direct current (I R ), and filters the direct current (I R ) through a low-pass filter (212) to remove noise.
  • the direction determination device (230) includes a voltage comparator (231) that obtains the difference between a reference voltage (V REF ) and an output voltage (Vo), a voltage proportional controller (232) that generates a reference current (I REF ) using the comparison result of the voltage comparator (231), a current comparator (233) that compares the reference current (I REF ) with a direct current (I R ) whose direction is determined, and a current proportional controller (234) that outputs a timing determination signal (Vd) according to the comparison result of the current comparator (233).
  • the timing decision signal (Vd) can determine the width of power conversion depending on its value.
  • the size of the power converted during DC/DC current conversion can be determined by controlling the timing and cycle of turning on or off of switching elements.
  • an alternating current (Is) also flows to the coil (130) on the secondary side, the second converter (120).
  • the output current (Io) becomes a direct current according to the selective turn-on or turn-off operation of the switching elements (S5 to S8) of the second converter (120) of the induced alternating current (Is).
  • the above AC current (Is) is detected by an AC current sensor (300) such as a CT.
  • an AC current sensor (300) such as a CT. This is an example for explanation, and the AC current sensor (300) can be detected in the coil (130) on the first converter (110).
  • the alternating current (Is) is rectified through the rectifier (211) of the rectifier (210) and converted into direct current (I R ).
  • the direct current (I R ) is filtered through a low-pass filter (212) to remove elements such as noise. At this time, since the direct current (I R ) always becomes a positive value, it is not possible to perform directional control of a bidirectional DC/DC converter using it.
  • the encoder (221) of the direction confirmation device (220) checks the value of the timing decision signal (Vd), which is the output of the direction decision device (230), to determine whether it is a positive or negative value.
  • the encoder (221) can use a phase shifter, and if it determines the code by checking the timing decision signal (Vd), which is a voltage value, it can be applied to the present invention regardless of its configuration.
  • the multiplier (222) applies the code value of the encoder (221) to the DC current (I R ) described above and provides it to the direction determination device (230).
  • the voltage comparator (231) of the directional decision device (230) obtains the difference between the reference voltage (V REF ) and the output voltage (Vo) of the second converter (120), and the voltage proportional controller (232) generates and outputs a reference current (I REF ) that compensates for the comparison result of the two voltages.
  • the current comparator (233) compares the reference current (I REF ) with the direct current (I R ) whose direction is determined, and the current proportional controller (234) outputs a timing decision signal (Vd) according to the comparison result.
  • the timing decision signal (Vd) is a signal that determines the switching timing of the switching elements (S1 to S4) of the first converter (110) on the input side and the switching elements (S5 to S8) of the second converter (120) on the output side, and becomes a positive or negative value depending on the direction of the detected current.
  • the above timing determination signal is provided to a gate driving circuit (not shown in the drawing) that drives each switching element (S1 to S8), and the converter (100) operates by determining the direction of power conversion by driving the gate driving circuit.
  • the present invention can detect an alternating current while confirming its directionality, and can control a bidirectional insulated DC/DC converter by confirming the directionality.
  • the present invention relates to a current detection circuit of a bidirectional insulated DC/DC converter that can confirm the direction of power conversion for AC power using natural laws, and has industrial applicability.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

La présente invention concerne un circuit de détection de courant pour un convertisseur CC/CC isolé. L'invention concerne un circuit de détection du courant dans un convertisseur CC/CC isolé bidirectionnel comportant un premier convertisseur et un second convertisseur qui comprennent chacun une pluralité d'éléments de commutation et sont disposés des deux côtés d'une bobine pour la conversion de puissance, pouvant comprendre : un capteur de courant alternatif permettant de détecter le courant alternatif dans la bobine ; et un détecteur permettant de déterminer la directionnalité de la présente conversion de puissance à partir du courant alternatif détecté par le capteur de courant alternatif et de produire en sortie un signal de détermination de commande temporelle selon la directionnalité confirmée.
PCT/KR2025/000231 2024-01-24 2025-01-06 Circuit de détection de courant pour convertisseur cc/cc isolé bidirectionnel Pending WO2025159393A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2024-0010725 2024-01-24
KR1020240010725A KR20250115593A (ko) 2024-01-24 2024-01-24 양방향 절연형 dc/dc 컨버터의 전류 검출 회로

Publications (1)

Publication Number Publication Date
WO2025159393A1 true WO2025159393A1 (fr) 2025-07-31

Family

ID=96545562

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2025/000231 Pending WO2025159393A1 (fr) 2024-01-24 2025-01-06 Circuit de détection de courant pour convertisseur cc/cc isolé bidirectionnel

Country Status (2)

Country Link
KR (1) KR20250115593A (fr)
WO (1) WO2025159393A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160029725A (ko) * 2013-07-11 2016-03-15 후지 덴키 가부시키가이샤 양방향 dc/dc 컨버터
KR102145330B1 (ko) * 2020-02-27 2020-08-18 주식회사 광성계측기 양방향분산전원을 관리하기 위한 모니터링 시스템 및 방법
KR20210103544A (ko) * 2018-12-21 2021-08-23 로베르트 보쉬 게엠베하 Dc 전압 컨버터의 1차 측으로부터 2차 측으로 또는 그 반대로의 양방향 전력 전송을 위한 dc 전압 컨버터
KR20220146113A (ko) * 2021-04-23 2022-11-01 엘에스일렉트릭(주) 전류 측정 장치
JP2023018738A (ja) * 2021-07-28 2023-02-09 三菱電機株式会社 電力変換装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160029725A (ko) * 2013-07-11 2016-03-15 후지 덴키 가부시키가이샤 양방향 dc/dc 컨버터
KR20210103544A (ko) * 2018-12-21 2021-08-23 로베르트 보쉬 게엠베하 Dc 전압 컨버터의 1차 측으로부터 2차 측으로 또는 그 반대로의 양방향 전력 전송을 위한 dc 전압 컨버터
KR102145330B1 (ko) * 2020-02-27 2020-08-18 주식회사 광성계측기 양방향분산전원을 관리하기 위한 모니터링 시스템 및 방법
KR20220146113A (ko) * 2021-04-23 2022-11-01 엘에스일렉트릭(주) 전류 측정 장치
JP2023018738A (ja) * 2021-07-28 2023-02-09 三菱電機株式会社 電力変換装置

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