Prepare for IEC 62368 with X capacitor safety discharger

As IEC 62368 replaces earlier safety standards for televisions and IT equipment, Power Integrations is certifying its X capacitor discharge IC for the new standard.

The X capacitor controls the conducted emission of the device and directly bridges the incoming main power source-meaning that even if the device is turned off, the residual charge in it may cause electric shock to the person touching the input terminal-including a plug that is not plugged into the power source.

In order to prevent this kind of electric shock, many capacitors must use some kind of discharge equipment, these capacitors will not be automatically discharged by subsequent circuits.

Resistors are an option, but resistors will always waste power when the device is powered on.

Power Integration's answer is its CAPZero series of ICs-self-powered two-end devices, which are connected in series with a discharge resistor. When the input power is cut off, they will automatically connect the discharge resistor, and when the power is turned on, they will disconnect the resistor to a large extent.

The maximum power supply current is 21.7uA-about 5mW from 230V power supply.

"Once the new standard reaches the mandatory stage, the mains electrical equipment must pass the IEC 62368 certification. CAPZero IC has passed the new standard certification, which can provide a solution to eliminate the discharge resistance loss, while only requiring minimal changes to the system or PCB layout. Edward Ong, Product Marketing Manager of Power Integrations, said that this approach allows engineers the flexibility to optimize no-load power consumption, power factor and EMI, and meet the latest safety regulations.

These ICs are packaged in SO-8 and can be used before or after the system input fuse because they essentially comply with all international safety standards for open circuit and short circuit fault testing. The device is suitable for all AC-DC converters with X capacitors and provides 825 or 1,000V integrated MOSFETs. Provide 5uF up to 1s discharge version.

It is expected to be applied to PCs, servers, workstations, monitors, TVs, printers, laptops, home appliances and low-vampire power adapters that need to comply with the ErP Lot 6 standard.

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