 | ESDr Series Bidirectional Programmable DC Power Supply The ESDr Series Bidirectional Programmable DC Power Supply is a high-performance DC power supply unit featuring both source and load capabilities. Its core operating principle involves mains input filtering, PFC rectification, LLC resonant conversion, and Buck-Boost conversion, combined with high-precision sampling, drive, and control circuits.This enables a wide range, high-stability DC output while also possessing a
load function that can automatically regenerate energy back to the grid. It is widely applicable in various electronic equipment testing, photovoltaic inverter testing, battery simulation, and charge-discharge testing scenarios,providing users with efficient, energy-saving, and flexible testing solutions. |
Grid Regeneration:
Combines both sourceand load functions. In load mode, energy can be automatically regenerated backto the grid, significantly reducing energy consumption and aligning with greenenvironmental concepts.
Wide Output Range:
The output range isextended to three times that of conventional "matrix" power suppliesof the same power class. Under constant power output mode, it offers moreflexible combinations of voltage and current.
High Efficiency Design:
Employs activePower Factor Correction (PFC) technology, achieving a power factor >0.99 atfull load. Coupled with high-frequency LLC multi-resonant inverter technology,the overall efficiency reaches up to 93%.
Multiple Operation Modes:
Supports threebasic operating modes: Constant Voltage (CV), Constant Current (CC), andConstant Power (CP), catering to diverse testing requirements.
Advanced Programmable Functions:
Features 10 non-volatile shortcut groups and 50 sequence tests (each containing20 steps), supporting custom parameter settings and automatic execution.
Comprehensive Simulation Functions:
Includes PV array simulation I-V capability with built-in standard PV testmodes like EN50530 and Sandia. Supports nearly 10 conventional battery curvesimulations and custom battery curve settings, providing complete batterycharge/discharge functions.
High Precision and Stability:
Incorporates precise internal voltage and current measurement modules withexcellent output stability. Voltage setting and measurement accuracy: ≤ 0.05% F.S.; Current setting and measurement accuracy: ≤ 0.10% F.S.
Comprehensive Protection Mechanisms:
Features multiple protections including Over Voltage Protection (OVP), OverCurrent Protection (OCP), Over Temperature Protection (OTP), Vsense reverseconnection protection,and input over/under voltage protection, ensuring thesafety of the equipment and the load.
User-Friendly Operation andDisplay:
Equipped with a 4.3-inch high-brightness color touch LCD display,supporting three control methods: knob, button, and touch, providing anintuitive and easy-to-use interface.
Flexible Scalability:
Supports parallelconnection of up to 10 units of the same model. Some models support seriesconnection to meet higher voltage or current output requirements.
Programming Interfaces:
Standard RS232interface. Optional interfaces include RS485, GPIB, LAN, CAN, USB. Supportsmultiple communication protocols such as ESDR protocol, Modbus (RTU/TCP), andSCPI, facilitating integration into automated test systems.
Optional Analog Interface Control:
Supports remote control via 0-5V/0-10V voltage signals or 4-20mA currentsignals, including start/stop control, voltage/current/power setting, andstatus feedback.
Remote Sense:
Equipped with SENSEterminals to enable output lead voltage drop compensation during high-currentoperation, ensuring voltage measurement accuracy at the load end.
Basic Output Functions
Constant Power Wide Range Output: Transcends the limitations of traditional "matrix" power supplies by allowinga wide combination of voltage and current output within the rated power. For example, the 80V/510A/15kW modelcan output either 80V @ 187.5A or 29.4V @ 510A at 15kW.Multi-Mode Output: Automatically switches between CV, CC, and CP modes based on output parameters and load resistance. Operating modes can also be specified manually to adapt to different load characteristic tests.
Programmable and Sequence Test Functions
Shortcut Group Storage and Recall: Supports storage of operatingparameters for 10 groups. Non-volatile memory design ensures parameters are retained after power-off, allowing quick recall of commonly used test parameters.Sequence Test Function: Supports editing of up to 50 sequences,each containing 20 steps. Configurable parameters include voltage/current/power ramping, cycle counts, and jump logic, suitable forautomatic aging tests, multi-condition continuous testing, etc.
Specific Simulation Functions
PV Simulation Function: Supports multiple PV models like SAS, EN 50530, Sandia，and SAS2. By inputting parameters such as irradiance, temperature, and maximum power point, it can accurately simulate the I-V output curve of PV panels, suitable for PV inverter testing scenarios.
Battery Simulation Function: Built-in curves for nearly 10 conventional battery types such as LMO, LCO, LFP. Supports user-defined battery voltage SOC curves and provides visual display of V-Soc curve changes, suitable for testing battery-related equipment.
Battery Charge/Discharge Function: Supports modes like constant current charging, constant voltage charging, and constant current discharging. Allows setting charge/discharge termination conditions (cut-off current, cut-off voltage, cut-off time, cut-off capacity), meeting battery performance testing requirements.
Load Mode Functions
Provides Constant Current (CC), Constant Voltage (CV), Constant Power (CP), Constant Resistance (CR), and composite load modes including CVCC, CVCR, CCCR, and AUTO. These modes can simulate different load characteristics for applications such as power supply load regulation testing.
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