Fueled by increasingly stringent regulations on automotive emission and coupled with the ever-growing expansion and complexity of electrical equipment in vehicles, more and more hybrid electric vehicle (HEV) models are entering the market. From Japan to Europe, different automakers promote different hybrid technologies. Nevertheless, the 48V mild hybrid system has become the focal point for vehicle development in recent years.

The main task of the 48V mild hybrid system is to assist the engine while saving fuel. In the EV power system, the motor and drive controller are responsible for converting the energy in the battery to make it run. When the vehicle brakes, the motor will switch to engine mode to charge the battery, converting its kinetic energy into electricity and storing it back into the battery. Therefore, under different operating conditions, the motor no longer simply obtains energy from the battery, but consumes or recovers electricity through different conversion modes, thereby improving the energy utilization of the power system.

▲Chroma 62000D Integrated with Chroma Soft Panel

Chroma proudly presents the new 62000D series Bidirectional DC Power Supply, which combines a power supply and a regenerative load, feeding the DUT energy back to the grid, this bidirectional feature makes it particularly suitable for performance testing of EV power motor drivers. When the EV’s motor driver accelerates, the 62000D outputs in constant voltage mode and runs the motor driver. When the EV brakes or descends and the motor decelerates, it switches to engine mode, and the 62000D can withstand the reverse current recharge of the driver without adding any extra load or protection devices. Moreover, when integrated with the specialized Chroma Soft Panel, the 62000D can transform into a battery simulator, replacing the real EV battery to allow testing of the motor driver. It takes only one Chroma 62000D to fulfill an array of test applications.

Consider this case where a large power supply manufacturer implemented Chroma 62000D. When the engineer carried out performance tests on a motor drive and used the actual battery to operate, they needed to arrange multiple batteries in different charging states or had to repeatedly charge and discharge a single battery according to each test condition. The test process was lengthy and tedious, even apart from the safety issues that the possible failure of the DUT could bring about. In this test scenario, Chroma 62000D with soft panel provided a safer and stable test environment. Simulating different battery conditions and charge/discharge characteristics, Chroma 62000D helped to quickly complete all test requirements, shorten the test process, and improve overall work efficiency!

With the current mild hybrid 48V system emerging in the car industry, the Chroma 62000D series can operate two 62180D-100 in parallel, providing 100V, 1080A, and 36kW output capacity. For HEV/BEV with 400V systems, Chroma 62180D-600 has a single output capacity of 600V, 120A, and 18kW. According to different DUT requirements, users can connect multiple units up to 180kW in parallel to meet higher power test applications.

▲Chroma 62000D Master-Slave Parallel Cabinet Reaches 180kW