News
How does a coupling transformer achieve stable data transmission?
Release time:
2026-10-10 10:31
I. For What Why do new energy vehicles need communication?
Charging a new-energy vehicle is not merely about “transferring electrical energy”; it also requires verifying the vehicle’s status, negotiating charging parameters, and performing safety authentication.
The EVCC (Electric Vehicle Communication Controller) serves as the vehicle-side communication control core, responsible for information exchange between the vehicle and the charging equipment, enabling charging control, protocol conversion, and safety management.
Figure 1 | Data Communication Link Between EVCC and Charging Equipment
Lika Electric Control ensures every transmission is more reliable.
EVCC establishes a data connection with the SECC via PLC communication technology through the charging cable, enabling information exchange between the vehicle and the charging equipment.
II. How does the EVCC use PLC to enable communication between the vehicle and the charging station?
The EVCC serves as the vehicle’s communication hub, leveraging PLC technology to enable the charging cable to function simultaneously as both a power conductor and a data link. By using a coupling transformer to superimpose signals onto the power line, it facilitates real-time data exchange between the vehicle and the charging station.
Communication link:
Figure 2 | Schematic diagram of communication between EVCC and the charging station PLC
III. Key Component in PLC Communication: Coupling Transformer
In the EVCC PLC communication module, the coupling transformer plays a crucial role in signal coupling and electrical isolation transmission.
PLC chip → Primary winding → Magnetic core coupling
→ Secondary winding → Power line
Figure 3 | Principle of PLC signal isolation and transmission using a coupling transformer
Take the Lekai electric control coupling transformer—CG1010—as an example.
Figure 4 | Schematic diagram of the structural components of a coupling transformer
Signal Generation and Coupling
On the left side, the PLC communication chip inside the EVCC generates a high-frequency carrier signal, which, after being amplified by the driver circuit, is coupled into the charging cable via the PLC coupling transformer.
Isolation and Anti-Interference
The intermediate PLC coupling transformer provides electrical isolation between the communication‑chip side and the power‑line side, while simultaneously performing signal coupling and impedance matching, thereby enhancing the security and electromagnetic interference immunity of the communication link.
Vehicle-to-charger communication
After receiving the carrier signal, the SECC on the right side exchanges information with the EVCC—covering charging status, power demand, and security authentication—ultimately establishing reliable communication between the new-energy vehicle and the charging equipment.
Figure 5 | Main Functions of the Coupling Transformer
IV. Lika Electric Control EVCC PLC Magnetic Component Solution
For PLC communication applications in new-energy vehicles, Lika Electric Control offers highly reliable magnetic-component solutions:
|
Product |
Application |
|
LT14-111 |
SECC PLC Communication Coupling |
|
ETA16208 |
PLC signal isolation |
|
GC1010 |
HPLC Communication Module |
|
LTS121CG |
EVCC module |
Table 1 | EVCC PLC Magnetic Component Solutions
Support:
ISO 15118
DIN 70121
GB/T 27930
CHAdeMO
Liqi Electric Control HPLC Application Diagram
From smart grid HPLC to PLC communication in new-energy vehicles, Lika Power Control remains focused on signal transmission and power‑connection technologies, providing customers with highly reliable magnetic component solutions.
1. Smart Grid HPLC Communication Scheme
LT07-200 supports HiSilicon HPLC communication; chip platform: HiSilicon Hi3911V200
2. PLC Communication Scheme for New Energy Vehicles (EVCC / SECC)
Supports the UnicomSemi GreenPHY PLC chip platform:
Compatible with Lekai electronic control: LTS121CG —— EVCC PLC Coupling Transformer
EVCC Vehicle Side: Lianxintong MSE1022
SECC pile tip: Lianxintong MSE1021 / MSEX25-i
Compatible with Lika Electric Control: LT14-111 —— SECC PLC Coupling Transformer
Lianxintong MSE1021 / MSEX25-i
The figure below is a schematic diagram of the Lianxintong complete solution.
Lika Electric Control ensures every transmission is more reliable.
Address: Room 8B, Building 7, No. 2388 Chenxing Road, Minhang District, Shanghai
Phone: 021-60143380
Related Downloads
Official WeChat
Scan code attention to us
Contact Us
Address: 8B, Building 7, 2388 Chen Hang Highway, Minhang District, Shanghai