I have come across a word 'VOOC' flash charge technology of OPPO. I have done googling and knew what it does and how it charges fast a smartphone(20W, 5V 4A). When checking on the pin connections of the USB cable, it is mentioned that micro USB end of the cable has 6 pins and the other end of the cable and its adapter receptacle has 5 pin connections. I need to know whether this charger with the default cable can be used in other brand smartphones or not as well as the possibility of using a standard data cable with that charger for other brand smartphones.

Also, it is mentioned that VOOC flash charge is different from Qualcomm's quick charge 2.0 that the former uses Constant-Current Charging whereas latter uses constant voltage charging. Among these two, which heats up the smartphone? Voltage or Ampere?

  • \$\begingroup\$ The phone should have it's own smart charger to do both CC then CV then off at 10% of CC. But mobile must support VOOC to use it. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Mar 13 '18 at 3:58
  • \$\begingroup\$ Where did you read about the "VOOC" and "6-pins"? Link please. \$\endgroup\$ – Ale..chenski Mar 13 '18 at 4:14
  • \$\begingroup\$ @AliChen, link:- gtrusted.com/oppo-vooc-ultra-fast-charger \$\endgroup\$ – CNA Mar 13 '18 at 4:26
  • \$\begingroup\$ @TonyStewart.EEsince'75 , What if the mobile does not have VOOC support? \$\endgroup\$ – CNA Mar 13 '18 at 4:26
  • \$\begingroup\$ Then it wont communicate to the smart charger to use it. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Mar 13 '18 at 4:34

It looks like an(other) attempt to split the battery charging functionality between "VOOC" phone and wallwart AC-DC converter, using "constant current" along the cable and therefore reducing incoming voltage.

So the answer to your first question is "it depends", other brand smartphones will reduce their power intake if they see voltage drop, so some phones might be charging, but always at lesser rate than their dedicated chargers.

To your second question, there is a misconception. Qualcomm QC doesn't use "constant voltage charging", the QC supplies higher voltage to provide more charging power to a phone across the SAME thin cable. The phone, in turn, CONVERTS this power into proper charging sequence, constant current first, then constant BATTERY voltage, all in accord with Li-Ion established technology.

Regarding your third question, "which one heats the phone more, voltage or current", the answer is "neither". Phones use DC-DC CONVERTERS based on switching technoloigy, so the heat is a function of net efficiency of those converters, all depends how well they are designed, with 70%, or with 96% efficiency. So the dissipation (and temperature increase of phone's body) might differ.

As it looks, the so-called "VOOC technology" just re-partitioned the standard charger by moving the CC-CV converter part of standard charger into the AC-DC plug, and leaving only battery wires directly to internal Li-Ion cell. Then yes, this schema will result in less overheating of the phone body, because the main (and power dissipating) functionality has moved into wall unit.

Finally, the article states that indeed their "micro-USB" end has six pins, which makes it a proprietary connector, which likely doesn't fit into any other normal micro-USB phone. Overall the whole VOOC is a pretty questionable proposition.

EDIT: Close inspection of the VOOC micro-connector indeed shows that it has 7 pins, not 6 as the sloppy article states:

enter image description here

It makes a bit more sense (power and ground are extended on outer sides), but clearly any normal cable won't fit into the OPTO phone.

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  • \$\begingroup\$ But they have mentioned that if a standard USB cable, then oppo phones will charge at 1.5 A rate. What about this? If oppo smartphone supports, then what about other smartphones since all has micro usb 2.0 port? \$\endgroup\$ – CNA Mar 13 '18 at 5:02
  • \$\begingroup\$ @Dhans, the standard micro-USB connector has 5 pins. If they managed to double voltage and ground pins by extending the connector body to left and right, this should make it "7-pin" if anything, although there is very little room mechanically. How they managed to have 6 pins and still claim some inter-operability, bites me. \$\endgroup\$ – Ale..chenski Mar 13 '18 at 5:17

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