SMPS Transformer build up satisfying IEC600079-11 standard.
Hi Power Integrations Team,
I would require your suggestion and advice for intrinsically safe transformer construction as required to pass the explosive environment IEC 600079-11 standard. This standard is applicable to systems used in the Oil and Gas industry in an explosive environment.
I have designed a SMPS power supply using Power Integrations INNO switch (INN3164) with the following specifications.
Input : Universal
Output: 1) 5V@2.0A
2) 15V @ 0.3A (Both are are floating outputs)
I have design transformer using PI expert tool with following no of turns.
Primary : 66 turns
Primary bias: 8 turns
Sec 1 (5V) : 3 turns
Sec 2 (15V) : 7 turns
The transformer is designed in EF20 bobbin, but it seems impossible to build a transformer to meet the creepage and clearance distance between primary and secondary which requires creepage distance of 10mm and clearance distance of 6mm as per Table attached with the mail.
I have attached creepage and clearance requirements as per IEC 600079 (level of protection ib, voltage peak value = 375V).
I have also selected one EF20 transformer bobbin having two section separate Primary and Secondary which is attached in the mail.
Please go through it and suggest the transformer build up to pass the creepage and clearance test as per the required by standard.
|PI_Instrinsically safe transformer.doc_.pdf||90.81 KB|