In recent years, the global supercharging pile market has also shown strong growth momentum. With the accelerated popularization of 800V high-voltage platform vehicles, high-power charging piles are moving from "demonstration pilot projects" to "large-scale deployment." However, behind this expansion, the charging pile industry faces severe technical challenges—how to ensure the performance, safety, reliability, and efficiency of high-power charging piles? The answer lies in a core testing device: a high-precision bidirectional DC test power supply.
I. The Dilemma of Traditional Testing: The Triple Challenges of High-Power Charging Pile Testing
The testing requirements for high-power DC charging piles (with a power rating of≥ 60kW) are extremely stringent. Charging pile testing covers multiple dimensions, including charging efficiency, current accuracy, electrical safety, protection functions, and grid compatibility: output voltage accuracy error must be ≤ ±1%, output current accuracy error must be ≤ ±2%; charging efficiency under rated load must be ≥ 95%; overcurrent, overvoltage, and short-circuit protection action time must be ≤ 100ms; total harmonic distortion rate must be ≤ 5%, and power factor must be ≥ 0.9.
Traditional DC test power supplies suffer from three major drawbacks when addressing these testing requirements:
1. Unidirectional energy flow, resulting in significant waste.
Traditional power supplies only support energy output from the grid to the charging station, unable to absorb energy discharged or fed back to the grid from the charging station. In high-power testing, the generated energy cannot be fed back to the grid and is consumed as heat, leading to substantial electricity waste and increased load on the cooling system.
2. Lagging dynamic response, unable to simulate real-world conditions.
Charging stations face highly dynamic load changes in actual use—from low to high SOC, switching between different vehicle battery protocols, and bidirectional energy flow in V2G mode. Traditional power supplies have slow response times and cannot accurately reproduce these transient changes, resulting in significant deviations between test results and real-world scenarios. Actual test data shows that the time difference for the same vehicle to charge from 20% to 80% at different brands of supercharging stations can be up to three times. This difference is largely due to insufficient dynamic response capabilities at the charging station.
3. Insufficient control precision, failing to meet testing requirements.
The requirements for voltage and current accuracy in charging pile testing are becoming increasingly stringent. Traditional power supplies often maintain a control accuracy of around ±0.1%, which is insufficient to meet the demands of higher precision testing and cannot accurately simulate the dynamic characteristics of batteries under different SOC states.
II. Core Technological Advantages of High-Precision Bidirectional DC Test Power Supplies
The emergence of high-precision bidirectional DC test power supplies provides a systematic solution to these challenges. New-generation testing equipment, represented by the ANIVT(F) series bidirectional programmable DC test power supplies, is leading technological innovation in the charging pile testing field.
Integrated Source and Load, Energy Feedback
The core technological advantage of bidirectional DC test power supplies lies in their integration of DC power supply (Source) and regenerative load (Sink) functions, supporting bidirectional energy flow. With a feedback efficiency of up to 92%-93%, the electrical energy absorbed during testing is "cleanly" returned to the grid, significantly reducing laboratory energy costs. This cost-saving effect is particularly significant for high-power charging pile aging tests that require long-term operation.
Microsecond-level dynamic response, accurately simulating real-world operating conditions
The new generation of high-precision bidirectional DC test power supply adopts high-frequency PWM rectification technology and bidirectional DC conversion technology, with a forward/reverse switching time of less than 1ms and a transient response time of ≤2ms. What does this mean? In highly dynamic scenarios such as simulating vehicle charging protocol switching, sudden increases in battery SOC, and reverse energy flow in V2G mode, the test equipment can follow real-time and accurate changes in operating conditions, unlike traditional power supplies, which are "half a beat slower."
High-precision control, meeting stringent testing requirements
In terms of accuracy, the voltage/current accuracy of the high-precision bidirectional DC test power supply can reach ≤0.05% F.S. This level of accuracy far exceeds the national standard requirements for the accuracy of charging piles themselves, equivalent to "measuring the device under test with a more precise ruler," ensuring the reliability and consistency of test results. Through dual-loop control technology and FPGA digital control technology, the equipment can achieve rapid response to customer equipment applications under ultra-high control precision, ensuring equipment testing stability and the accuracy of test data.
Battery simulation function, replacing real battery testing
The high-precision bidirectional DC test power supply also possesses powerful battery simulation capabilities, supporting the simulation of seven types of batteries, including lithium, nickel-metal hydride, and lead-acid. It supports first-order, second-order, and third-order battery models. By importing battery parameter files in .mat or .csv format, the output characteristic curves of various real batteries can be reproduced in the laboratory. This function eliminates the reliance on real battery packs for charging pile testing, significantly reducing testing costs and safety risks.
III. Ultra-wide voltage coverage: Meeting the testing challenges of the 800V high-voltage platform era
With the rapid popularization of 800V high-voltage platform vehicles, by early 2026, 800V electric cars will account for approximately 40% of newly launched pure electric vehicles. Charging pile testing faces new challenges. The new generation of high-precision bidirectional DC test power supply has a voltage coverage range of 0-2250V, providing seven voltage level options and supporting high-voltage series technology, meeting the full coverage testing needs from 400V conventional charging piles to 800V and even 1000V supercharging piles.
More notably, in high-power scenarios, the power of a single device can be expanded from 50kW to 1MW through parallel connection of multiple units, adapting to all testing scenarios from the laboratory to the production line. This means that whether it's low-power prototype testing in the laboratory R&D stage or large-scale testing at full load on the production line, the high-precision bidirectional DC test power supply can provide "full coverage with one platform."
IV. Solving Testing Challenges: Five Application Scenarios of High-Precision Bidirectional DC Test Power Supplies
Charging Efficiency Testing and Verification
Using a high-precision bidirectional DC test power supply, the conversion efficiency of charging piles under different load conditions can be accurately measured, verifying whether the requirement of "charging efficiency ≥95% under rated load" is met. Simultaneously, with the help of the regenerative load function, the test energy is fed back to the grid, achieving green and low-carbon testing.
Dynamic Load and Operating Condition Simulation
Through a 900-step programming function and a minimum programming time of 1ms, the power curve changes during the real charging process can be accurately simulated—from the conversion from constant current charging to constant voltage charging, the charging power changes at different SOC stages, and the bidirectional energy flow in V2G mode, etc.
Output Voltage/Current Accuracy Verification
Utilizing a control accuracy of up to 0.05%, the output voltage and current of the charging pile can be calibrated across the entire range, ensuring compliance with the national standard requirements of "output voltage accuracy error ≤ ±1%, output current accuracy error ≤ ±2%".
Protection Function and Safety Testing
The high-precision bidirectional DC test power supply is equipped with four safety mechanisms: over-temperature protection, over-voltage protection, over-current protection, and over-power protection. It can safely perform over-current, over-voltage, and short-circuit protection function tests on the charging pile, verifying that the protection action time is ≤100ms.
Charging Compatibility Testing
Through the built-in multiple battery characteristic models, it can simulate the output characteristics of batteries from different brands and vehicle models, comprehensively verifying the cross-vehicle compatibility of the charging pile. Combined with standard CAN, RS232/RS485, and LAN communication interfaces, seamless integration with automated testing systems can be achieved.
V. Conclusion: A Key Leap from "Scale Expansion" to "Quality Testing"
In 2026, the charging pile industry is moving from "scale expansion" to a new stage of "high-quality development". Industry trends indicate that high-precision bidirectional DC test power supplies are transforming from "R&D auxiliary tools" to "core quality assurance tools." They not only provide charging pile manufacturers with accurate testing methods that meet requirements, but also significantly reduce the testing costs throughout the entire product lifecycle through energy feedback and intelligent testing functions.
