WO2021068833A1 - 一种用于交直流漏电检测的电路 - Google Patents
一种用于交直流漏电检测的电路 Download PDFInfo
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- WO2021068833A1 WO2021068833A1 PCT/CN2020/119325 CN2020119325W WO2021068833A1 WO 2021068833 A1 WO2021068833 A1 WO 2021068833A1 CN 2020119325 W CN2020119325 W CN 2020119325W WO 2021068833 A1 WO2021068833 A1 WO 2021068833A1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R19/0007—Frequency selective voltage or current level measuring
- G01R19/0015—Frequency selective voltage or current level measuring separating AC and DC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/17—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
- G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/003—Fault detection by injection of an auxiliary voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
- H02H3/332—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers with means responsive to dc component in the fault current
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- 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
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- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
Claims (13)
- 一种用于交直流漏电检测的电路,包括:将外部输入的供电电压转化为漏电检测所需电压的LDO模块;对高频时钟信号进行分频的分频模块;用于驱动MOS管,并控制不同工作模式切换的逻辑控制模块;用于驱动外部漏电检测线圈的MOS管驱动模块;用于感应交直流漏电信号和漏电自检信号的漏电检测线圈;将流过漏电检测线圈的电流信号转化为电压信号的采样电阻;对采样信号进行放大的PGA模块;用于控制PGA放大倍数的增益控制模块;对经过放大后的采样信号进行数模转换的ADC模块;用于交、直流漏电信号和漏电自检信号处理的DSP模块;用于限制流过漏电检测线圈电流的限流模块。
- 根据权利要求1所述的电路,其特征在于:分频模块用于对高频的时钟信号进行分频,以控制漏电检测线圈激励方波的频率,由软件控制以提高电路的使用灵活性。
- 根据权利要求1所述的电路,其特征在于:逻辑控制单元用于驱动MOS管,并控制不同工作模式的切换;当检测直流漏电时,根据控制信号FB注入的一定频率的方波信号,逻辑控制单元控制M1-M4四个MOS管循环导通,当检测交流漏电时,根据控制信号SM的有效电平,逻辑控制单元控制M5和M2导通,其余MOS管截止;当需要自检时,根据控制信号ZJ的有效电平,M6导通,M5截止,同时M1-M4循环导通,通过电感分流的方式,在采样电阻上产生漏电自检信号。
- 根据权利要求3所述的电路,其特征在于:MOS管栅极g1-g4的控制逻辑保证M1和M3不能同时导通,M2和M4不能同时导通。
- 根据权利要求4所述的电路,其特征在于:MOS管驱动电路由M1-M6六个MOS管组成,用于驱动漏电检测线圈;由逻辑控制电路驱动这六个MOS管的导通或关断。
- 根据权利要求5所述的电路,其特征在于:当检测直流漏电时,M1-M4组成H桥驱动电路,以产生驱动漏电检测线圈的正反两个方向的方波,此时M5和M6截止;当检测交流信号时, M2和M5导通,M1、M3、M4、M6截止,漏电检测线圈以电磁感应的方式检测零、火线之间交变的剩余电流,进而在采样电阻R1上产生压降;当自检时,M1-M4循环导通,M6导通,M5截止,漏电检测线圈采用电感分流的方式产生自检信号,用于检验漏电检测链路是否良好。
- 根据权利要求1所述的电路,其特征在于:漏电检测线圈用于检测零、火线之间的剩余电流,并通过中间自检抽头进行漏电检测链路的自检。
- 根据权利要求1所述的电路,其特征在于:LDO模块将输入的电源电压转换为驱动漏电检测线圈所需的电压,并隔离电路的其他模块的电源波动对检测电路的影响。
- 根据权利要求1所述的电路,其特征在于:PGA模块将采样电阻两端的电压信号进行放大,其放大倍数可通过软件进行配置,以提高电路的使用灵活性。
- 根据权利要求1所述的电路,其特征在于:根据采样信号的大小,实时控制PGA的放大倍数。
- 根据权利要求1所述的电路,其特征在于:ADC模块对经PGA放大后的信号进行模拟信号到数字信号的转换。
- 根据权利要求1所述的电路,其特征在于:DSP模块对采样信号进行处理,根据MOS管驱动模块的不同运行模式,对直流漏电信号、交流漏电信号和漏电自检信号采用不同的算法分别处理。
- 根据权利要求1所述的电路,其特征在于:限流模块用于限制流过漏电检测线圈的电流。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP20875192.5A EP4024059B1 (en) | 2019-10-09 | 2020-09-30 | Circuit for alternating current and direct current leakage detection |
CA3153758A CA3153758C (en) | 2019-10-09 | 2020-09-30 | Circuit for alternating current and direct current leakage detection |
US17/767,892 US20240085495A1 (en) | 2019-10-09 | 2020-09-30 | Circuit for alternating current and direct current leakage detection |
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CN201910954730.8 | 2019-10-09 | ||
CN201910954730.8A CN110531211B (zh) | 2019-10-09 | 2019-10-09 | 一种用于交直流漏电检测系统的电路方案 |
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US (1) | US20240085495A1 (zh) |
EP (1) | EP4024059B1 (zh) |
CN (1) | CN110531211B (zh) |
CA (1) | CA3153758C (zh) |
WO (1) | WO2021068833A1 (zh) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113612195A (zh) * | 2021-08-06 | 2021-11-05 | 浙江天正电气股份有限公司 | 一种剩余电流保护装置、电子设备及信号控制方法 |
CN116774101A (zh) * | 2023-08-21 | 2023-09-19 | 保定传能电子科技有限公司 | 一种低压线路漏电流检测装置 |
Families Citing this family (4)
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CN110531211B (zh) * | 2019-10-09 | 2021-10-29 | 青岛鼎信通讯股份有限公司 | 一种用于交直流漏电检测系统的电路方案 |
CN110927623A (zh) * | 2019-12-06 | 2020-03-27 | 国网江苏省电力有限公司南通供电分公司 | 一种电力设备漏电检测系统 |
CN111856119A (zh) * | 2020-08-24 | 2020-10-30 | 上海煜闻电子科技有限公司 | 一种漏电流检测装置和检测方法 |
CN113809716B (zh) * | 2021-09-25 | 2023-09-15 | 浙江巨磁智能技术有限公司 | 一种纯硬件化实现的b型漏电保护方法 |
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- 2020-09-30 EP EP20875192.5A patent/EP4024059B1/en active Active
- 2020-09-30 WO PCT/CN2020/119325 patent/WO2021068833A1/zh active Application Filing
- 2020-09-30 CA CA3153758A patent/CA3153758C/en active Active
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CN110531211A (zh) | 2019-12-03 |
EP4024059B1 (en) | 2023-08-23 |
CA3153758C (en) | 2023-10-10 |
EP4024059A1 (en) | 2022-07-06 |
EP4024059C0 (en) | 2023-08-23 |
CN110531211B (zh) | 2021-10-29 |
US20240085495A1 (en) | 2024-03-14 |
CA3153758A1 (en) | 2021-04-15 |
EP4024059A4 (en) | 2022-11-16 |
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