Bidirectional DC Power Supply – 62000D

POWER CONVERSION TESTING OF ELECTRIC VEHICLES AND MICROGRID STORAGE

Renewable energy sources such as PV, EV, fuel cell, and battery are the market trend as the replacement of traditional energy sources (coal, oil, etc.). Yet, the subsequent rising need for electricity will actuate the faster commercialization of distributed energy storage in microgrids. The bidirectional design of power conversion devices urges battery applications to achieve high efficiency, high voltage conversion, and high power density direction, which prompts the need for battery simulation (bidirectional power supply) testing designs.

TWO-IN-ONE: BIDIRECTIONAL DC POWER SUPPLY AND LOAD

Chroma 62000D has a bidirectional switch power supply design that offers two-quadrant operation with positive current/positive voltage as well as negative current/positive voltage, enabling both DC power supply output and regenerative DC load. The absorbed energy feeds back to the grid with a conversion efficiency up to 93% and can operate in constant voltage, constant current, and constant power modes. Compared to traditional power supply and load, the 62000D two-in-one bidirectional DC power supply saves space, reduces energy loss and heat dissipation, and is easier to wire and configure.

With the current spread of electric cars, their on-board chargers are controlled through back and forth energy supply to V2G (Vehicle to Grid), V2L (Vehicle to Load), and V2H (Vehicle to Home). The regenerative load modes of the 62000D models include constant current (CC), constant voltage (CV), and constant power (CP) and s imulate battery charging activity during developing and testing o f the car. Where conventional methods needed one apparatus for DC power supply and another for regenerative DC load, one single Chroma 62000D can fulfill both charging and discharging tests on its own.

HIGH VOLTAGE 1800V PCS TESTING

A power conversion system (PCS) serves to realize bidirectional power conversion between the battery system and the grid with the terminal battery voltage of the newest devices reaching up to 1500V and having a charge/discharge function, active power control, reactive power regulation, and off-grid switch. A common issue for users is how to prepare an actual high voltage battery test for the charge/discharge transition with a standard <100ms performance of a PCS. And it is impossible to use R&D verification and manufacture with fast reproduction, control, and safety . The high voltage 62180D-1800 (1800V/40A/18kW) model can be connected in parallel to reach 180kW/1800V/400A, so replacing the real battery simulation as power supply or regenerative power load to carry out this charge/discharge transition with a seamless switch.

HIGH TRANSIENT RESPONSE <1.5MS

Chroma 62000D allows seamless current conversion between the two quadrants of supply and electrical load without changing the output characteristics or causing damage. To use this in many bidirectional DC-DC and DC-AC battery charge/discharge tests requires very fast charge/discharge conversion. To increase this transient responsiveness, the 62000D bidirectional DC power supply has a high speed transient response time of less than 1.5ms (-90% to +90%) and gives stable voltage output.

To test the acceleration and braking of the motor driver under driving conditions, the conversion between the battery and power components will encounter supply and recharge of electrical energy. The very fast transient response of the 62000D two quadrant can simulate the battery and convert accor ding to the actual needs of the motor , offering stable voltage and allowing current recharge during braking

CV/CC PRIORITY MODE

62000D series of fer constant voltage (CV) and constant current (CC) priority modes, so that the user can switch priority output modes in line with the DUT application requirements. When using traditional CV controlled DC power supplies for battery charge/discharge tests, laser diode, LED, and other component tests, the supply needs a procedure to change CV to CC which causes current surge and damages the DUT. When switching the 62000D power output from CV to CC, the CC priority mode avoids a current surge and satisfies diverse testing needs.

TESTING STANDARDS LV123 AND LV 148

Along with the global ener gy efficiency and carbon emission reduction trends, the car industry have established technical development standards for new energy vehicles, which define tests for a variety of electric vehicles. The L V123 guidelines specify the vehicle’s electrical characteristics and safety of high-voltage components, whereas the LV148 standard covers tests for electric and electronic components in 48V electrical system motor vehicles. Chroma 62000D has a high-speed CV dynamic response slope that can be controlled up to 180V/ms, which is applicable to the electrical characteristics tests of many vehicle guidelines. When combined with the Chroma Softpanel, the user can even conduct the tests at the push of a button.

SAFETY AND AC FAULT PROTECTION

Chroma 62000D bidirectional power supplier is set up with OVP , OCP, OPP, OTP, AC Fault, and Fan Fail protection circuits. Under the energy recycling function that returns energy into the grid, the A/D design serves to identify input voltage and frequency anomalies. When detecting any anomalies, the power supply equipment will automatically turn off the D2D power output to ensure safe use of the grid.

UNIVERSAL AC POWER RANGE 200-480VAC

Chroma 62000D bidirectional DC power supply is equipped with an active PFC >0.98 for low energy consumption and high conversion efficiency . Moreover, to fit the universal AC power input range, the 62000D series has a very wide input power range of three-phase 200Vac to 480V ac input. The user can buy one single device without having to configure it for use in other areas.

REMOTE INTERFACES

Chroma 62000D supports various remote interfaces, enabling the user to control the PC through the standard USB and Ethernet (LXI) or optional GPIB interfaces. Moreover, the optional CAN interface as frequently used in the automobile industry , is compliant with the CAN2.0 A 11-bit and CAN2.0 B 29-bit identifiers and has a V/ I/P cycle time of up to 10ms

FOUR TIMES AUTO-RANGING OUTPUT

Chroma 62000D series has a four times auto-ranging operation range. The 62180D-600 model has an 18kW/600V/120A output and operates flexibly in various combinations as the figure shows. Compared with the three times output range of competitors, the 62000D can give much greater current at low voltage. This offers an even wider coverage of low voltage/high current and high voltage/low current DUTs that other DC power supplies can test. When used into a standard ATE system and in a laboratory, one 62000D can replace multiple DC power supplies to significantly save space and costs.

When testing high power 10kW-180kW conversion components ( e.g. PCS, ESS, Charger, Inverter), users need to consider small volume, light weight, utilization rate, flexible assembly and disassembly for operation of various power systems, and influence of R&D during system failure and maintenance. The 62000D Series has a smart master/slave control mode that can connect 2-10 devices, enabling fast and simple series/parallel operation for use by R&D, QC, and at the production line. In this mode, the master scales values and downloads data to slave units so programming is as simple as using a single unit, and the digital current sharing is highly stable and without noise interference.

USER-FRIENDLY INTUITIVE CONTROL INTERFACE

Chroma 62000D has a next generation human-machine control interface with an intuitive and user-friendly touch screen. Operation of the apparatus is as easy as using a smartphone, with its intelligent and convenient user interface; through icons on the touch screen, the user can complete any voltage/current settings and measurements, Program Sequence control settings, preview output waveforms, etc.

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