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Minimise idle losses while meeting IEC 62368-1

25 Nov 2015  | Edward Ong

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CapZero-2 ICs address this issue, as devices still permit a discharge even if there is a fault. The parts have passed severe 8 KV line surges and the devices have been designed with pin redundancy so that even in the case of pin opens or shorts, they will still provide a safe discharge for the X capacitor energy. This allows power supplies to comply with IEC 62368-1, the over-arching safety standard which covers a broad segment of energy-using equipment, and which replaces IEC 60950 for IT equipment and IEC 60065 for television, video and audio equipment. The IEC 62368-1 safety standard was approved and implemented last year and will become mandatory in 2019.

Tests that must be passed include a 120 hour high humidity test. This is carried out at +40 ˚C and a relative humidity of 93 per cent. Other tests include 100 positive and 100 negative impulses of severe line surge. These are done between the line and neutral using a capacitor with the largest capacitance and a resistor with the smallest resistance, and then repeated with a capacitor with the smallest capacitance and a resistor with the largest resistance as recommended by the manufacturer. The time between any two impulses must not be less than one second. Next, 110 per cent of the rated AC voltage is applied for two and a half minutes and then the circuit is subjected to 10,000 cycles of power on and off. Again, this is performed using a capacitor with the smallest capacitance and a resistor with the largest resistance, and then repeated with a capacitor with the smallest capacitance and a resistor with the largest resistance as specified by the manufacturer. The power on and off cycle time is not less than one second.


Summary
With the introduction of the CapZero-2 ICs, power supply designers only need to qualify one part number for all their X capacitor discharge IC applications. This is said to increase design flexibility and speed time-to-market while reducing the resources required to qualify devices. Because CapZero-2 devices are safety-certified to CB and Nemko requirements, developers do not need to perform a separate safety test on the X capacitor discharge circuit of the power supply.


About the author
Edward Ong is product marketing manager at Power Integrations.


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