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TIDA-010232

AFE for insulation monitoring in high-voltage EV charging and solar energy reference design

TIDA-010232

Design files

Overview

This reference design features an electric bridge DC insulation monitoring (DC-IM) method which allows an accurate symmetrical and asymmetrical insulation leakage detection mechanism and an isolation resistance detection mechanism. We present a new generation of isolated amplifiers and switchers that enable isolation without an external supply on the hot side. Therefore, the MCU can power the isolation device from the cold side. The insulation monitoring diagnostic can be handled directly by the power conversion or charging protocol MCU.

Features
  • Monitors isolation resistance and insulation leakage from DC to protective earth (PE) at regular intervals
  • Detects insulation fault and symmetrical and asymmetrical warnings
  • Method: switch in resistive divider branch to determine isolation resistance of DC+ or DC– to PE
  • Reinforced insulation analog front end (AFE) for MCUs sitting on the cold side
  • No external supply on hot side

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEZ8.PDF (1860 K)

Reference design overview and verified performance test data

TIDMAG7.PDF (605 K)

Detailed schematic diagram for design layout and components

TIDMAG8.PDF (140 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDMAG9.PDF (273 K)

Detailed overview of design layout for component placement

TIDMAH1.ZIP (7846 K)

Files used for 3D models or 2D drawings of IC components

TIDCG72.ZIP (558 K)

Design file that contains information on physical board layer of design PCB

TIDMAH0.PDF (948 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

General-purpose op amps

TLV6001Single, 5.5-V, 1-MHz, RRIO operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Isolated amplifiers

AMC3330±1-V input, precision voltage sensing reinforced isolated amplifier with integrated DC/DC

Data sheet document-pdfAcrobat PDF
Linear & low-dropout (LDO) regulators

TPS7A24200-mA, 18-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF20333.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Solid-state relays

TPSI2140-Q1Automotive 1400-V, 50-mA, isolated switch with 2-mA avalanche rating

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Software

Support software

TIDA-010232 Software — TIDCG73.ZIP (1321 K)

Technical documentation

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View all 2
Type Title Date
Technical article How to achieve higher-reliability isolation and a smaller solution size with solid-state relays May 09, 2022
Design guide AFE for Insulation Monitoring in High-Voltage EV Charging & Solar Energy RefDes PDF | HTML May 09, 2022

Related design resources

Hardware development

EVALUATION BOARD
LAUNCHXL-F280049C C2000 Piccolo MCU F280049C LaunchPad™ development kit

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