Editorial Technical Reference

Isolated Power Supply

This page explains how Isolated Power Supply is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A power supply unit that provides electrical isolation between input and output circuits within a Battery Control Unit (BCU).

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Isolated Power Supply in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Isolated Power Supply

Definition
An isolated power supply is a critical component within a Battery Control Unit (BCU) that converts and regulates power from the main battery or vehicle electrical system to provide clean, stable, and electrically isolated power to sensitive BCU electronics. It prevents ground loops, reduces noise interference, and protects low-voltage control circuits from high-voltage transients in the battery system. The unit typically employs a transformer or switching converter to transfer energy while maintaining galvanic isolation, ensuring safety and signal integrity. Key parameters include an input voltage range of 9–36 V DC, a regulated output of 12 V DC ±1%, output power of 5–15 W, isolation voltage of 1500 V DC (per IEC 60747), efficiency ≥85%, operating temperature -40 to 85 °C (per ISO 16750), storage temperature -40 to 105 °C, ingress protection IP67 (per IEC 60529), line regulation ±1%, load regulation ±2%, ripple and noise ≤50 mV p-p, weight ≤100 g, and dimensions 50×30×15 mm. Materials typically include ferrite core, copper wire, silicon steel, PCB, and semiconductor components. This directory entry is for reference; verify model-specific values and standards with the legal manufacturer or supplier before procurement or integration.
Working Principle
The isolated power supply uses a transformer or switching converter to transfer energy from the input side to the output side while maintaining galvanic isolation through magnetic coupling or capacitive isolation. This prevents direct electrical connection between the high-voltage battery side and the low-voltage control side, ensuring safety and signal integrity. The switching converter typically operates at high frequency to reduce transformer size, and feedback control regulates the output voltage. Isolation barriers protect sensitive electronics from transients and ground loops.
Common Materials
Ferrite Core, Copper Wire, Silicon Steel, Printed Circuit Board (PCB), Semiconductor Components
Technical Parameters
ParameterTypical rangeNotes & selection driver
Input Voltage Range9–36 V DCWide input range for automotive battery fluctuations
Output Voltage12 ±1% V DCRegulated output for control electronics
Output Power5–15 WSized for BCU loads
Isolation Voltage1500 V DCInput to output isolationIEC 60747
Efficiency≥85 %At full load
Operating Temperature-40–85 °CAutomotive temperature rangeISO 16750
Storage Temperature-40–105 °CNon-operating
Ingress ProtectionIP67Dust-tight and waterproofIEC 60529
Line Regulation±1 %Output change over input range
Load Regulation±2 %Output change from no load to full load
Ripple & Noise≤50 mV p-pPeak-to-peak on output
Weight≤100 gLightweight for automotive mounting
Dimensions (L×W×H)50×30×15 mmCompact footprint for BCU integration

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Transformer
    Provides galvanic isolation and voltage transformation through magnetic coupling
    Material: Ferrite core with copper windings
  • Switching Transistors Part
    Controls power flow through high-frequency switching
    Material: Silicon or Gallium Nitride semiconductors
  • Control IC Part
    Regulates switching frequency and maintains output voltage stability
    Material: Silicon integrated circuit
  • Output Rectifier Part
    Converts AC from transformer secondary to DC output
    Material: Silicon diodes or synchronous MOSFETs
  • Filter Capacitors Part
    Smooths output voltage and reduces ripple
    Material: Aluminum electrolytic or ceramic capacitors
  • Feedback Circuit
    Carries the output voltage error back across the isolation barrier so the controller can regulate.

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar
other spec: Isolation voltage: 1500V DC, Input voltage range: 9-36V DC, Output voltage: 5V/12V/24V DC
temperature: -40°C to +85°C
Media Compatibility
✓ Automotive battery management systems ✓ Industrial control panels ✓ Medical equipment power isolation
Unsuitable: High-vibration environments without additional mounting
Sizing Data Required
  • Required output power (W)
  • Input voltage range (V DC)
  • Isolation voltage requirement (V DC)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Capacitor Degradation
Cause: Electrolytic capacitor drying out or swelling due to thermal stress, overvoltage, or aging, leading to reduced filtering efficiency and potential short circuits.
Transformer/Inductor Failure
Cause: Insulation breakdown from overheating, moisture ingress, or voltage spikes, causing winding shorts or open circuits and loss of isolation.
Maintenance Indicators
  • Audible buzzing or humming from the unit, indicating loose components, transformer issues, or capacitor problems.
  • Visible bulging or leaking capacitors, or discoloration/burning on the PCB, suggesting overheating or component failure.
Engineering Tips
  • Implement regular thermal imaging inspections to detect hotspots in transformers, capacitors, and power semiconductors before failure.
  • Use voltage regulation and surge protection on the input side to minimize electrical stress, and ensure adequate ventilation to maintain optimal operating temperatures.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 61010-1: Safety requirements for electrical equipment for measurement, control, and laboratory use EN 55032: Electromagnetic compatibility of multimedia equipment - Emission requirements

Quoted from the published standard.

Manufacturing Precision
  • Output voltage regulation: +/- 1% of nominal voltage under full load
  • Isolation resistance: >100 MΩ at 500 VDC between input and output
Quality Inspection
  • High-potential (hipot) test: 3000 VAC applied between input and output for 1 minute
  • Load regulation test: Measure output voltage variation from 0% to 100% load
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Manufacturers of Isolated Power Supply

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

LINGFRAN
Suzhou, Jiangsu, CN
Also makes: Power Supply System, Frequency Converter, Power Management and 5 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Medical Isolated Power Supply Systems”
View source page ↗ lingfran.com · recorded 2026-08-28
View profile Send enquiry
Shenzhen Creatall Electronics Co., Ltd.
Beijing, CN
Also makes: AC-DC Converter, Power Supply Module, Single Board Computer and 6 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “AC-DC isolated power supply module”
View source page ↗ creatall.com · recorded 2026-09-03
View profile Send enquiry

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Frequently Asked Questions

What is the typical input voltage range for this isolated power supply?

The input voltage range is 9–36 V DC, designed to accommodate automotive battery fluctuations. Confirm the exact range for your specific model with the manufacturer.

What isolation voltage does this unit provide?

The isolation voltage is 1500 V DC, referenced to IEC 60747. This is a procurement reference; verify compliance for your application.

What are the operating temperature limits?

The operating temperature range is -40 to 85 °C, per ISO 16750. Storage temperature is -40 to 105 °C. Always check the datasheet for the exact model.

Is this power supply suitable for outdoor or harsh environments?

The ingress protection rating is IP67, indicating dust-tight and waterproof characteristics per IEC 60529. However, suitability depends on the specific mounting and environmental conditions; consult the manufacturer.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Battery Control Unit (BCU)
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 13 October 2026

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