Elecom's 18W Power Delivery AC Charger May Look 'Cute' But Has Many USB Power Delivery Compliance Issues
More well known Japanese brands like Elecom sells many types of mobile and PC peripherals including the 18W Power Delivery AC Charger. While offering up to 18 watts of USB Power Delivery charging over Type-C, it can be quite confusing as to which Power Delivery specs the charger actually supports. Even though Elecom has claimed USB Power Delivery 3.0 support on its product page, we verified that the Elecom 18W Power Delivery AC Charger only supports USB Power Delivery 2.0 (see test results below).
The Elecom 18W Power Delivery AC Charger uses 15 watts (5 volts @ 3 amps), 18 watts (9 volts @ 2 amps) and 18 watts (15 volts @ 1.2 amps) power profiles for fast charging through USB Power Delivery. 18 watts output is enough for most mobile phones sold today such as the Apple iPhone XS Max or Android phones like the Google Pixel 3 XL and the Samsung Galaxy S9+, as well as providing decently fast charging to tablets like the Apple 11-inch iPad Pro (2018). Just make sure to use the Apple USB-C to Lightning Cable if you need to charge your iPhone.
This is how the Elecom 18W Power Delivery AC Charger looks like after it was purchased in Japan. Unlike the typical charger packaging, this one has a lot of information printed on it.
Japan is widely recognized for its unique style of cutesy images which is also reflected on the Elecom 18W Power Delivery AC Charger. This makes it a lot more appealing than most standard chargers especially for Japanese customers.
The Elecom 18W Power Delivery AC Charger serves as a AC wall charger with a single USB Type-C port that comes with foldable prongs to plug into a AC wall socket.
To find out more on the Elecom 18W Power Delivery AC Charger's power capabilities, 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.
The USB Power Test App first negotiates a power contract for every PDO supported by the Elecom 18W Power Delivery AC Charger, and increases the load gradually to find the threshold where over current protection (OCP) kicks in and voltage and current start to drop for safety reasons.
The USB Power Test App also reports out all the PDO's supported by the Elecom charger and their OCP thresholds.
|PDO#1 Fixed: 5V 3A|
|PDO#2 Fixed: 9V 2A|
|PDO#3 Fixed: 15V 1.2A|
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. We can observe as the current increases beyond the OCP threshold, the voltage immediately shuts off.
The USB Power Test App can also use the Granite River Labs USB Power Delivery Compliance C2 Tester integrated with the GW Instek APS-7100 programmable AC power supply to compare the charger's power output vs power input so that power efficiency can be measured and compared to regulatory limits from United States of Energy (DOE) Level VI or European Union's CoC Tier 2 requirements. We can repeat the power efficiency tests for different PDO's, current load conditions, and different AC input ranges, allowing us to get a complete picture of power efficiency ranges across all different usage scenarios.
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, we can confirm that the Elecom 18W Power Delivery AC Charger supports USB Power Delivery 2.0. Many compliance failures were also observed for the charger.
USB-IF High Level Mapping Summary
Test Group Description
BMC Physical Layer Transmitter
BMC Physical Layer Receiver
BMC Physical Layer Miscellaneous
Protocol Specific Primary
Power Source/Sink Primary
TDA.126.96.36.199 BMC PHY TX EYE
TDA.188.8.131.52 BMC PHY TX BIT
TDA.184.108.40.206 BMC PHY RX INT REJ
TDA.220.127.116.11 BMC PHY RX BUSIDL
TDA.18.104.22.168 BMC PHY TERM
TDA.2.2.1 BMC PROT SEQ GETCAPS
TDA.22.214.171.124 BMC PROT SEQ CHKCAP P PC
TDA.126.96.36.199 BMC PROT SEQ CHKCAP NOMARK P PC
TDA.2.2.7 BMC PROT BIST NOT 5V SRC
TDA.2.2.9 BMC PROT GSC REC
TDA.188.8.131.52 POW SRC LOAD P PC
TDA.184.108.40.206 POW SRC TRANS P PC
BMC Eye Diagram