IS/IEC 62368-1:2023 for Audio-Video Receivers and Home Cinema Processors

AV receivers (audio-video receivers), surround sound processors, and home cinema control units are migrating from IS 616 to IS/IEC 62368-1:2023. This guide focuses specifically on the power and thermal challenges of modern high-channel-count AV receivers.

The Power Challenge in Modern AV Receivers

Modern AV receivers have grown to 9, 11, and even 13 channels of amplification — plus DSP processing, network streaming, HDMI switching, and room correction. A modern flagship AV receiver can draw 800W-1,200W from the mains at full power. This comfortably exceeds PS3 classification (above 240VA) under IS/IEC 62368-1:2023.

PS3 Requirements for High-Power AV Receivers

As a PS3 energy source, the mains power supply section requires:

• Reinforced insulation or double insulation between mains circuit and accessible surfaces
• Protective earth connection mandatory and reliably maintained
• Creepage and clearance distances appropriate for PS3 at the applicable working voltage
• Full documentation of insulation system including component ratings

Thermal Evaluation at Maximum Power

AV receivers are tested thermally at maximum power into rated impedance loads across all channels simultaneously — the worst-case operating condition. Heatsink temperatures, transformer temperatures, and chassis surface temperatures must all remain within limits. Real-world AVRs are rarely driven to maximum power on all channels, but the standard requires the worst-case evaluation.

HDMI and Optical Digital Ports

HDMI ports in AV receivers carry both audio-video data and low-voltage power (5V for HDMI CEC). The HDMI isolation from mains circuits must maintain required creepage/clearance. Optical (TOSLINK) digital ports are fiber-optic — they carry no electrical hazard but the LED emitter must be IEC 60825 compliant (typically Class 1).

Class D Amplifier Modules

Many modern AV receivers use Class D (switching) amplifiers for efficiency. Class D amplifiers operate at high switching frequencies (400kHz-1MHz) and have specific EMI characteristics. The high-frequency switching content must be filtered adequately to meet EMC requirements. IS/IEC 62368-1:2023 thermal evaluation for Class D amplifiers is simpler than Class AB since they run cooler.

Migration Timeline

IS 616 → IS/IEC 62368-1:2023 by November 2028. High-end AV receivers (flagship models with 11+ channels) require the most attention for PS3 documentation. House of Testing handles IS 62368 AV receiver testing.