Circuit scheme for alternating-current and direct-current electric leakage detection system

A leakage detection and DC leakage technology, applied in circuit devices, emergency protection circuit devices, and measurement using digital measurement technology, can solve the problems of high cost, complex circuit structure, low precision and sensitivity, and achieve low application cost, The effect of simple circuit structure

Active Publication Date: 2019-12-03
QINGDAO TOPSCOMM COMM
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the current leakage detection technology commonly used, it is impossible to achieve full coverage of DC to high-frequency kHz AC le...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Circuit scheme for alternating-current and direct-current electric leakage detection system
  • Circuit scheme for alternating-current and direct-current electric leakage detection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Combine below figure 1 and figure 2 The principle of the AC and DC leakage detection circuit scheme provided by the present invention and the residual current detection method are described.

[0016] figure 1 A circuit solution for an AC / DC leakage detection system of this embodiment is provided, wherein L and N represent live wire and neutral wire respectively. The circuit scheme mainly includes LDO module, frequency division module, logic control module, MOS transistor drive module, leakage detection coil, sampling resistor, programmable gain amplifier (PGA), gain control module, analog-to-digital conversion module (ADC), DSP, Current limiting module and other modules.

[0017] The LDO module is mainly used to convert the input power supply voltage into the voltage required to drive the leakage detection coil. And isolate the impact of power fluctuations of other modules of the circuit on the detection circuit. When DC leakage detection is performed, the differe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a circuit scheme for an alternating-current and direct-current electric leakage detection system, wherein the circuit is capable of completing direct-current electric leakage detection, alternating-current electric leakage detection and electric leakage sampling link self-detection and the like. The circuit scheme mainly comprises an LDO module for converting externally inputted power supply voltage into a voltage required by electric leakage detection, a frequency division module for carrying out frequency division on a high-frequency clock signal, a logic control module for driving an MOS tube and controlling switching of different working modes, an MOS tube driving module for driving an external electric leakage detection coil, an electric leakage detection coilfor sensing alternating-current and direct-current electric leakage signals and electric leakage self-detection signals, a sampling resistor for converting a current signal flowing through the electric leakage detection coil into a voltage signal, a PGA module for amplifying the sampling signal, a gain control module for controlling the amplification factor of the PGA, an ADC module for carrying out digital-to-analog conversion on the signal, a DSP module for processing alternating-current and direct-current electric leakage signals and electric leakage self-checking signals and a current limiting module for limiting loop currents.

Description

technical field [0001] The invention relates to the technical field of leakage detection and protection circuits, and mainly relates to a DC leakage detection circuit scheme, an AC leakage detection circuit scheme, and a leakage self-inspection circuit scheme. Background technique [0002] Residual current device (RCD) is a widely used safety protection device, used to prevent personal electric shock, electrical fire, electrical equipment damage, etc. According to the different types of detection current, RCD can be divided into: AC type for detecting alternating current, type A for detecting alternating current and pulsating direct current, type B for detecting alternating current, pulsating direct current and smooth direct current, and type B for detecting alternating current, high frequency current, pulsating direct current and smooth direct current DC type B+. [0003] At present, the RCD products that are widely used in the domestic market are mainly AC type and A type...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R31/02G01R19/25
CPCG01R19/25G01R31/52G01R19/0015H02H3/332G01R15/185H02H3/17H02H1/003Y02T10/70
Inventor 闫成稳王建华刘振
Owner QINGDAO TOPSCOMM COMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap