Safety standard 10
I want to discuss the LPS (limited power sources) circuit. What is LPS circuit? It should meet any one condition of below four:
a) the output is inherently limited complying with table 2B
b) through a resistor to get the output to meet the table 2B; if not a resistor but a PTC, the device should meet the IEC60730-1, clause 15 17 and J.17
c) through a regulating network limit to get the output to comply with 2B under normal and single-fault conditions.
d) if using overcurrent protective devices, the output current should meet the table 2C's requirements. The overcurrent protective devices are fuses, or non adjustable, non autoreset devices. The overcurrent protective devices should not more than 5A(Uoc<20Vac/dc) or 100/Uoc and the operate time should be less than 120s at 210% overload.
How is the table 2B? the main points of this table are as below:
Uoc<=30Vac/dc: output current should be <=8A, apparent power <=100VA
30<Uov<=60Vdc: output current should be <=150/Uoc, apparent power <=100VA
How is the table 2C? Main points are as following:
Uoc<=20Vac/dc: output current <=1000/Uoc, apparent power<=250, overcurrent device<=5A
Uoc>20Vac/dc(<=30Vac, <=60Vdc): output current <=1000/Uoc, apparent power<=250, overcurrent device<=100/Uoc
In addition, all the output voltages should be below the limitation of 42.4Vac peak or 60Vdc.
a) the output is inherently limited complying with table 2B
b) through a resistor to get the output to meet the table 2B; if not a resistor but a PTC, the device should meet the IEC60730-1, clause 15 17 and J.17
c) through a regulating network limit to get the output to comply with 2B under normal and single-fault conditions.
d) if using overcurrent protective devices, the output current should meet the table 2C's requirements. The overcurrent protective devices are fuses, or non adjustable, non autoreset devices. The overcurrent protective devices should not more than 5A(Uoc<20Vac/dc) or 100/Uoc and the operate time should be less than 120s at 210% overload.
How is the table 2B? the main points of this table are as below:
Uoc<=30Vac/dc: output current should be <=8A, apparent power <=100VA
30<Uov<=60Vdc: output current should be <=150/Uoc, apparent power <=100VA
How is the table 2C? Main points are as following:
Uoc<=20Vac/dc: output current <=1000/Uoc, apparent power<=250, overcurrent device<=5A
Uoc>20Vac/dc(<=30Vac, <=60Vdc): output current <=1000/Uoc, apparent power<=250, overcurrent device<=100/Uoc
In addition, all the output voltages should be below the limitation of 42.4Vac peak or 60Vdc.
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