Power Supply Test

Test reports

eVision Systems tests 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 with professional tools. You will receive a comprehensive test report for each tested device. An example of a test report result can be found in the link below.

> Request test report

Register demand

Register your test needs to receive a quote with pricing information and information on processing time. If you have any questions about the test procedure or need more 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 needed.

> Register test demand


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

  • DCP (2,5W)
  • SDP (2,5W)
  • CDP (4,5W)
  • USB A (18W)
  • USB B (18W)
  • Quick Charge (100W)
  • Proprietary

Which USB power supply standard can be tested?

USB 1.0 / 1.15 V0.1 A0,5 W
USB 2.05 V0.5 A2,5 W
USB 3.0/3.15 V0.9-1.5 A7,5 W
USB BC 1.25 V1.5 A7,5 W
USB Type C5 V3 A 15 W
Quick Charge 1.06,3 V1.5 A9,45 W
Quick Charge 2.05V / 9V / 12V1.67 A / 2A18 W
Quick Charge 3.03.6 V - 22 V (0.2 V Schritte)2.6 A / 4.6 A36 W
Quick Charge 43,6 V - 22 V (0.2 V Schritte)3A60 W
Quick Charge 4+3,6 V - 20 V (20 mV Schritte)3 A / 5A100 W
USB PD5 V / 12 V / 20 V5 A100 W
USB PD with PPS3.3 V - 21 V (20 mV Schritte)0 A - 5 A (50 mA Schritte)100 W

What is tested?


We check the power supply capability of USB ports, chargers and USB power banks.

To do this, we carry out the following tests

  • Verification that a USB host is capable of delivering the specified maximum performance without errors.
  • Determination of available USB performance profiles.
  • Ensuring voltage levels stay within specification under heavy loads.
  • Measurement of electrical residual ripple at 1 KHz.
  • Determining the real capacity in mAh (power banks)
  • Measurement of communication speed & data integrity of the 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 power output 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 specified standards due to a lack of budget and quality management. This problem has existed for years, but the problem has increased significantly due to the new USB Type C interface technology and the new specification's increase in power to up to 100 watts. 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 such as Apple, Intel, Dell and Belkin. Since many of the world's most famous manufacturers support this new technology, it is now used in all major 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 accordingly, since the power supply no longer simply supplies 5 volts DC voltage. With the latest Programmable Power Supply (PPS) specification extension, there are no longer any predefined power profiles. Instead, the power pack and smartphone negotiate up to 20 volts. If there are errors, there is a risk of expensive damage. USB PD is designed for a power supply of up to 100 watts (20 V/5 A). This requires electronically marked cables (E-markers) with a tiny chip in the connector. This tells the power pack how much current the cable can handle. Since USB-PD (Power Delivery) enables a significantly higher power output with regard to conventional USB charging standards, even small percentage deviations from the specification for cables or power supplies lead to problems, damage or, in the worst case, injuries. The number of cases of Type-C charging sockets that have burned out or burned out, caused by untested power supplies or cables whose resistors were incorrectly dimensioned and therefore delivered too much power, is constantly increasing.

What is USB Power Delivery?

USB-PD (PD stands for Power Delivery) is a universal standard that allows a wide range of devices that use USB-C to be quickly charged to deliver more power (greater 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 15W of power while a laptop may request 45W.

What is Quick Charge 4?

Quick Charge is a proprietary charging protocol developed by Qualcomm and used to manage power delivery to a range of devices over USB. This is achieved by these devices communicating with the power supply and negotiating an appropriate and increased voltage, resulting in faster charging. Quick Charge 4+ is the Lastet 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 to be charged, thus optimizing the charging conditions for each device.
You can register your need for testing here.