IEC 60747-5-5 Safety certification test items for optocouplers

This article mainly introduces the optocoupler products must pass the IEC 60747-5-5 optocoupler safety certification test items, including partial discharge test, isolation withstand voltage test, reliability verification test and other items, and provides a practical test method for each test item.

How do I do partial discharge testing under IEC 60747-5-5?

We useHT9464M TesterTwo steps:

• First add 6000V high voltage for 60 seconds (specific voltage depends on product specifications)
• Then drop to 1.5 times the operating voltage and hold for 10 seconds
  Key indicator: Discharge must be <5pC (equivalent to 5 electrons)

The production line can be simplified:

• Time reduced to 1 second
• Voltage increased to 1.875 times the operating voltage

How to do the isolation withstand voltage test according to IEC 60747-5-5

Periodically, this test has to be done:

• Using the HT9464M (up to 10kVrms) tester
• Check that the insulation is intact
• Ensure safety after years of use

Reliability Verification

We are constantly "torturing" optocoupler products according to standard requirements:

• Back and forth from a high temperature of 85°C to a low temperature of -40°C
• 85% power-on test in humidity environment
• 1000 hours of continuous operation to see if it will break down

Test item abbreviation

New changes in the 2020 edition of IEC 60747-5-5

1. New surge test: simulates lightning strikes and other sudden high voltages
2. Allowed to mark the basic insulation class
3. Replaces the old three standards, which are now standardized.

Attention:

• The certification body raids the production line every year
• Test equipment should be calibrated regularly
• Material changes must be retested