The Everwin 27W QC4+ Car Charger Was An Early Release of Qualcomm Quick Charge 4+ Certified Chargers

Everwin International Corp. sells the 27W QC4+ Car Charger as one of its first Qualcomm Quick Charge 4+ chargers in its USB Type-C power and adapter product selection. The Everwin 27W QC4+ Car Charger offers up to 27 watts charging using USB Power Delivery 3.0 based PPS (Programmable Power Supply) and Augmented PDO's for Qualcomm Snapdragon based phones that support PPS and can take advantage of the technology to optimize charging speed, performance and temperature like the Xiaomi Mi 8. 

Qualcomm Quick Charge 4+ technology also addresses compatibility with other phones that support non-PPS Power Delivery like the Apple iPhone XS Max or Android phones such as Google's Pixel 3 XL and the Samsung Galaxy S9+. The Everwin 27W QC4+ Car Charger allows max 27 watts output through USB Power Delivery using fixed PDO's (Power Delivery Objects) of 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps) and 27 watts (12 volts @ 2.25 amps) as well as variable power of 9.9-17.7 watts (3.3~5.9 volts @ 3 amps) and 9.9-33 watts (3.3~11 volts @ 3 amps) power profiles. By supporting 27 watts, the Everwin 27W QC4+ Car Charger can provide fairly decent charging to even tablets and smaller notebook computers like Apple's 11-inch iPad Pro (2018) and MacBook (Early 2016).

To maximize compatibility, the Everwin 27W QC4+ Car Charger also supports phones using Qualcomm Quick Charge instead of USB Power Delivery like the Xiaomi Mi 5.  

The Everwin 27W QC4+ Car Charger comes printed with the QC4+ logo which means the charger is also Qualcomm Quick Charge 4+ certified which you can use to connect to Type-C devices for quick charge up inside the car. Everwin also sells the 27W QC4+ Power Adapter if you need a equivalent Qualcomm Quick Charge 4+ based ac wall charger (click here for review).

We used the USB Power Test App from Granite River Labs with the Granite River Labs USB Power Delivery Compliance C2 Tester to generate the following test results for the Everwin 27W QC4+ Car Charger.

The USB Power Test App first negotiates a power contract for every PDO supported by the Everwin charger, and increases the load gradually to find the threshold where over current protection (OCP) kicks in and voltage and current starts to drop for safety reasons.

The USB Power Test App also reports out all the PDO's supported by the Everwin charger and their OCP thresholds. OCP thresholds for the Everwin charger are set at about 20% above the maximum current levels for the fixed PDO's. Interestingly, the charger does not advertise the 27 watts (12 volts @ 2.25 amps) PDO even though it was claimed to be supported on the charger itself. 

PDO	OCP (A)
PDO#1 Fixed: 5V 3A	3.59
PDO#2 Fixed: 9V 3A	3.58
PDO#3 PPS: (3.3~5.9)V 3A	3.02
PDO#4 PPS: (3.3~11)V 3A	2.47

The USB Power Test App takes this data to produce an I-V curve which graphically shows the relationship between voltage and current for each PDO.  Unlike other chargers that support PPS (Programmable Power Supply), the voltage immediately shuts off rather than displaying any current fold-back behavior where as the current increases beyond the OCP threshold, the voltage starts to curve down.

Using the USB Power Delivery Compliance C2 Tester from Granite River Labs to run just a subset of the full USB Power Delivery compliance test suite, the Everwin 27W QC4+ Car Charger exhibits specs compliance for most of the tests performed with no compliance failures observed.

USB-IF High Level Mapping Summary

Sl No	Test Category	Test Group Description	Test Result
1	PHY_PRIMARY_TX	BMC Physical Layer Transmitter	PASS
2	PHY_PRIMARY_RX	BMC Physical Layer Receiver	PASS
3	PHY_PRIMARY_MISC	BMC Physical Layer Miscellaneous	PASS
4	PROT_PRIMARY	Protocol Specific Primary	PASS
5	POWER_PRIMARY	Power Source/Sink Primary	PASS

Result Summary

Sl No	Test ID	Test Name	Test Result
1	TDA.2.1.1.1	TDA.2.1.1.1 BMC PHY TX EYE	PASS
2	TDA.2.1.1.2	TDA.2.1.1.2 BMC PHY TX BIT	PASS
3	TDA.2.1.2.2	TDA.2.1.2.2 BMC PHY RX INT REJ	PASS
4	TDA.2.1.2.1	TDA.2.1.2.1 BMC PHY RX BUSIDL	PASS
5	TDA.2.1.3.1	TDA.2.1.3.1 BMC PHY TERM	PASS
7	TDA.2.2.1	TDA.2.2.1 BMC PROT SEQ GETCAPS	PASS
11	TDA.2.2.7	TDA.2.2.7 BMC PROT BIST NOT 5V SRC	PASS
13	TDA.2.2.9	TDA.2.2.9 BMC PROT GSC REC	PASS
14	TDA.2.3.1.1	TDA.2.3.1.1 POW SRC LOAD P PC	PASS
15	TDA.2.3.2.1	TDA.2.3.2.1 POW SRC TRANS P PC	PASS

BMC Eye Diagram

We further captured the load trace below using the GRL-USB-PD C2 Compliance Test Solution App to verify that the Everwin charger makes use of different voltage and current levels for charging.