DC voltage measurement for interfaces between vehicle and charging station
For battery electric commercial vehicles, there is a quick-charging option via pantographs. This requires a contact between an external infrastructure system (with movable pantographs) and permanently installed charging rods on the vehicle roof. What speaks the most in favor of this method is that they can supply the vehicle with sufficient power without long charging breaks and keep it in operation: a significant advantage for road vehicles like city buses. Typically, there are several charging points for pantographs at different points along the vehicle’s route.
The higher the direct current of the pantograph system, the faster the vehicle can be charged. For this reason and for higher drive outputs, the tendency is to choose higher and higher voltages. Forecasts assume expected voltages of over 2000 V DC. Of course the technology for monitoring and isolating these voltages must keep pace with the evolving demand.
Key facts about the application
Sector
DC voltage measurement on-board systems for pantograph charging
Application
Checking the charging connection and connection to other on-board systems
Measured parameters
Voltage up to 1500 V DC, output standard signal 4-20 mA or 0-10 V DC
Main requirements
Compact measuring modules, footprint is one of the main criteria
The reliability of the voltage measurement plays a key role in ensuring vehicle availability
Protective separation of high voltages; necessary for protection in public transport
On-board systems for pantograph charging
Description of application
A DC roof container contains components that check the charging connection and the corresponding voltage, and establish the connection to the other on-board systems.
Requirements of the application
With the limited space in the DC roof container, the solution for voltage monitoring and isolation must be performant, reliable, and compact.
Why Knick?
P42000D2 is a compact high voltage transducer for voltage measurement and continuous isolation up to 2200 V AC/DC. With a housing width of only 45 mm, it is perfect for applications in small spaces. Measurement quality is ensured by a gain error of < 0.3 %, a response time T90 of 110 μs, and a cutoff frequency of 5 kHz.
H2 [Ind] [Proc] [App] Application Description
[Ind] briefly: where can be used Knick products [Proc] [App] Detailed application description, why is measured, which customer problem is solved
H3 [App] Initial Situation
Was there a solution before, which was perhaps not good enough? Have requirements changed
H3 [App] Requirements of Application
What were the special or biggest requirements: Operating environment, legal requirements, High Voltage
H3 [App] Solution
Products used and why the solution was implemented in this form
Associated industries and applications
Overview of test and measurement specific applications and product solutions in e-mobility
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Sept 2024
Interface Technology