USB power supply tests




eVision Systems determines the power supply capability of USB ports, chargers and USB power banks and determines the exact power consumption of a USB device. Our tests are subject to strict framework conditions and are implemented using professional tools. You will receive a comprehensive test report for every device tested. An example of a test report result can be found in the link below.

> View Test Report


Register Requirement

Register your test needs in order to receive an offer with price information as well as information on the processing time. If you have any questions about the test procedure or need further information about our USB power supply test, you can use the form included in the link. Please provide the number of devices to be tested, your contact details and any other information you may need.

> Register test requirement



Which USB Ports & Power Supplies Ports & Connectors can be tested?


USB Cable Types
DCP (2.5W) SDP (2.5W) CDP (4,5W) Typ C (36 W / 100W with PD &  PPS)
USB A (18W) Quick Charge (100W) USB B (18 W) Proprietary


Which USB power supply standard can be tested?

Specification Voltage Current Power
USB 1.0 / 1.1 5 V 0.1 A 0.5 W
USB 2.0 5 V 0.5 A 2.5 W
USB 3.0/3.1 5 V 0.9-1.5 A 7.5 W
USB BC 1.2 5 V 1.5 A 7.5 W
USB Typ C 5 V 3 A  15 W
Quick Charge 1.0 6.3 V 1.5 A 9,45 W
Quick Charge 2.0 5V / 9V / 12V 1.67 A / 2A 18 W
Quick Charge 3.0 3.6 V - 22 V (0.2 V Steps) 2.6 A / 4.6 A 36 W
Quick Charge 4 3.6 V - 22 V (0.2 V Steps) 3A 60 W
Quick Charge 4+ 3.6 V - 20 V (20 mV Steps) 3 A / 5A 100 W
USB PD 5 V / 12 V / 20 V 5 A 100 W
USB PD mit PPS 3.3 V - 21 V (20 mV Steps) 0 A - 5 A (50 mA Steps) 100 W


What is tested?

We check the power supply capability of USB ports chargers and USB power banks.
For this purpose we perform the following tests:
  • Checking whether a USB host is able to deliver the specified maximum power without errors.
  • Determining available USB power profiles.
  • Ensuring that voltage values remain within specification under high load.
  • Measuring electrical ripple at 1 KHz.
  • Determination of real capacity in mAh (power banks).
  • Measurement of communication speed & data integrity of USB port.
  • Measurement of the exact power consumption of a USB device.



Why should USB power supplies and connectors be tested?

There are many manufacturers of USB power supplies, but they have significant differences in quality. The output power of a USB power supply varies depending on the version of the USB specification and the connection and is clearly specified. However, not all manufacturers adhere to the given standards due to lack of budget and quality management. This problem has existed for years, but has increased significantly due to the new USB Type C interface technology and the power increase of up to 100 watts that comes with the new specification. USB-C, also known as USB Type C, is the latest connector developed by the USB Implementers' Forum (USB-IF) - a group of electronics industry leaders including Apple, Intel, Dell and Belkin. Since many of the world's best-known manufacturers support this new technology, it is now used in all popular mobile devices. Thanks to this support, USB-C will gradually replace the previous USB types, i.e. USB-A, USB-B and USB Mini-B. The new connector brings with it numerous innovations, including USB Power Delivery. 

What is the problem with USB Power Delivery?

Fast charging functions reduce the charging time enormously, but the risk of damage increases analogously because the power supply no longer simply supplies 5 volts DC. With the latest specification extension Programable Power Supply (PPS), there are no longer any predefined power profiles. Instead, the power supply and smartphone negotiate up to 20 volts. If there are errors, expensive damage is imminent. USB PD is designed for up to 100 watts of power (20 V/5 A). This requires electronically marked cables (e-markers) with a tiny chip in the plug. This tells the power supply how much current the cable can handle. Since USB-PD (Power Delivery) enables a much greater power output with respect to conventional USB charging standards, for the first time even small percentage deviations from the specification in cables or power supplies lead to problems, damage or, in the worst case, injury. The number of cases of burnt-out or burnt-through Type-C charging sockets caused by untested power supplies or cables whose resistors were incorrectly dimensioned and therefore delivered too much power is increasing. 
What is USB Power Delivery?
USB-PD (PD stands for Power Delivery) is a universal standard that allows a variety of devices using USB-C to be charged quickly to deliver more power (more than 7.5W) to devices with higher power requirements. Devices can request higher currents and supply voltages from compatible USB-PD hosts. For example, a phone may request 15 W of power, while a laptop may request 45 W.
What is Quick Charge 4?
Quick Charge is a proprietary charging protocol developed by Qualcomm and used to manage the power supply of a number of devices via USB. This is achieved by having these devices communicate with the power supply and negotiate an appropriate and increased voltage, resulting in faster charging. Quick Charge 4+ is the load version of this technology and supports 3V-21V at 100W (20V / 5A).
What is PPS?
The PPS (Programmable Power Supply) function allows incremental changes in voltage and current. With PPS, the adapter can have a variable output voltage by communicating with the device being charged to optimize charging conditions for each device.
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