Energizer High Tech Mains charger 336

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Official specifications:

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I got it in a clam shell, it is supposed to contain the charger and one usb cable.

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The charger has a red led that will light up when the usb output is delivering current.

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Measurements


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The charger can deliver about 1.35A before overload protection kick in, it is fine.

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It also works fine on 120VAC.

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No problems running one hour at 1A.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.

Temp3402

M1: 59,3C, M2: 55,4C, M3: 43,0C, HS1: 73,8C
HS1 is the transformer.

Temp3403

M1: 62,9C, HS1: 80,7C
Here HS1 is probably the mains switcher chip.

Temp3404

M1: 39,9C, HS1: 74,5C


10ohm

At 0.5A the noise is 12mV rms and 233mVpp.

5ohm

At 1A the noise is 15mV rms and 248mVpp.




Tear down

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My vice and a mallet could open it.

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The circuit board has a fusible resistor on the input (RF1), there is two mains capacitors with an inductor (L1) between.
On the low volt side there is a rectifier diode, two capacitors and the led.
The circuit board has space for a safety capacitor, but it is not mounted, datasheet for the chip is also without safety capacitor.

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On this side there is a bridge rectifier (BD1), the mains switcher (U1: LNK606DG) and a OpAmp (U2: AS358) for current detection. The current detection must be accross the two parallel 0.2ohm resistors (R9 & R11).

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Safety distance looks good.

Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

Charger works fine with low noise and is safe, but the coding is a bit old and 1A is fairly low current by todays standard.


Notes

Charger was supplied by Pro backup (probackup.nl)

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