| Briefing On Differences Between Power Adapters And Battery Chargers Ln Terms Of Safety Standards |
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power adapters |
battery charger |
| safety stabdards |
ul/en60950 |
ul1310 |
ul1012 |
en60335-2-29 |
| scope/category |
safety of information technology equipment |
class 2 bettery charges |
power units other than class 2 |
household and similar electrical appliances safety part 2-29:particular requirements for battery chargers |
| output voltage limtiations |
≤42.4vp or60vdc |
≤42.4vp or 42.4vdc |
42.4vp or 42.4vdc~600vp or 600vdc |
≤42.4vp or 42.4vdc |
| energy capacity limitations |
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output pawer ≤ 100vamax.
ouput current ≤5amax. |
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| output flexible cord type |
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sp-2,spe-2,spt-2,sv,sve,svts,se,so,sp-3,spt-3,st.sto,sj,sje,sjo,sjt,sjto |
sp-2,spe-2,spt-2,sv,sve,svts,se,so,sp-3,spt-3,st.sto,sj,sje,sjo,sjt,sjto |
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| output connector |
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a special application battery charger shall be provided woth a special use polarized connector complying with ul 1977 and certified. |
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| fault condition |
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Reverse Polarity Protection:For A Device Intended For Charging Batteries And Provided With Nonpolarized Output Connections,The External Output Leads Are To Be Connected In Revese Polarity To A Fully Charged Battery Intended For Theapplication. The Unit Is Then To De Connected To Its Maximum Test Voltage,And Operated Nutil The Ultimatecondition Is Observed,Or 4 Hours If Cycling Of An Autimatically Reset Protector Occurs. |
Reverse Polarity Protection:For A Device Intended For Charging Batteries And Provided With Nonpolarized Output Connections,The External Output Leads Are To Be Connected In Revese Polarity To A Fully Charged Battery Intended For Theapplication. The Unit Is Then To De Connected To Its Maximum Test Voltage,And Operated Nutil The Ultimatecondition Is Observed,Or 4 Hours If Cycling Of An Autimatically Reset Protector Occurs. |
the battery charger is connected to a fully charged batty.the connections being in reverse to normal use.the battery is to have the largest capacity of the types specified,however,being 70 ah.the battery charger is operated while supplied at rated voltage.no expiosion or fire will be observed.battery charger is then to be subjected to the dielectric voltager withstand test. |
| backfeed protection(bfp) |
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a battery charger should de equipped qith a protection device to prevent the battery from flowing back(backfeed).the protective device shall prevent the fault occurs.products shall carry "backfeed protectio" or "bfp" markiings. |
a battery charger for use in portable equipment or batteries shall de provided with a protectve devic to prevent the battery from flowing back(backfeed).the protectve device shall prevent the current from flowing out of the circuit when the fault occurs.products shall carry "backfeed protection" or "bfp"markings. |
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| capacitor across double insulation |
onr y1 or two y2 |
onr y1 or two y2 |
onr y1 or two y2 |
onr y1 or two y2 |
