On-board charger (OBC) converts the AC power of the charging station (EVSE) into DC power to charge the EV battery. Currently common OBC power specifications include 3.3kW, 6.6kW, 11kW, and 22kW. However, the future will bring increasing numbers of bidirectional on-board chargers (BOBCs) that apply to the EV through V2X modes. Chroma ATE provides test items that comply with QC/T 895 and other relevant test standards, assisting users with complete verification of various application modes on the unit under test (UUT).

OBC Test Architecture

BOBC Test Architecture

Standard Test Items

• CAN Communication Test
• Charger Input/Output Test
• Charger Line Regulation Test
• Charger Load Regulation Test
• Charger Hold On Adjust Test
• Charger Fin Ramp Shut Down Test
• Charger Fin Ramp Start Up Test
• Charger Over Load Protection Test
• Charger OVP Test
• Charger Peak Current Test
• Charger Ripple & Noise Test
• Charger Short Circuit Protection Test
• Charger Static Test
• Charger Vin Ramp Shut Down Test
• Charger Vin Start Up Test
   

Four CAN bus channels support CAN bus and CAN FD bus CAN bus and CAN FD bus TTL Digital input/output

Voltage, frequency, and duty cycles of the CP PWM signal can be set Enable signal produces 12V and 24V output AUX signal provides 16 independent channels with 12V and 24V output Single Ethernet port input control function output Protection circuits on the signal output terminals prevent output short-circuit protection

High voltage interface sustains OBC UUT output and DD UUT input Three-phase AC power interface provides OBC UUT input Low voltage interface supplies DD UUT output Optional source fixture switch simulates battery UUT voltage Dual-channel auxiliary power source interface Dual-channel low-current load interface Ten independent DMM signals test interface 5V trigger signal and two temperature resistant simulation channels interface Single USB port input control function output

Each EV will contain at least one DC-DC converter, the function of which is to convert the power of the battery into an auxiliary power output for system use. Chroma offers ATSs that comply with GB/T 24347 specifications, and can provide customized test solutions according to specific user needs.

Standard Test Items

• CAN Communication Test
• DC-DC Input/Output Test
• DC-DC Line Regulation Test
• DC-DC Load Regulation Test
• DC-DC Hold On Adjust Test
• DC-DC Over Voltage Protection Test
• DC-DC Peak Current Test
• DC-DC Ripple & Noise Test
• DC-DC Short Circuit Protection Test
• DC-DC Total Regulation Test
• DC-DC Vin Ramp Shut Down Test
• DC-DC Vin Ramp Start Up Test
• DC-DC Total Efficiency Test