(Last Updated On: 06/02/2024)

Introduction To The Internal Principles Of OBC On-Board Chargers from Bonnen Battery

Introduction To The Internal Principles Of OBC On-Board Chargers

In the technical field of battery electric vehicles (BEV), on-board chargers (OBC) play a core role. It converts alternating current (AC) into direct current (DC) for battery charging. The design of OBC not only involves the complex power electronic conversion process, but also includes key communication functions such as charging connection confirmation (Charge Coupling, CC) and control pilot (CP), which are crucial for ensuring the smooth progress of the charging process and charging safety.

Introduction To The Internal Principles Of OBC On-Board Chargers from Bonnen Battery

The input filter plays a primary role in the design of OBC. It is mainly used to eliminate electromagnetic interference and peak voltage from the power grid, protecting the OBC from the impact of these interferences. This part is usually composed of inductors, capacitors, and sometimes also includes varistors.

The next rectifier bridge is responsible for converting AC power into DC power. It usually consists of multiple diodes or transistors forming a bridge rectifier. The rectifier bridge is an important part of handling high current and is crucial to the stability of the OBC.

The Power Factor Correction (PFC) module reduces energy waste and grid burden by optimizing the power factor of the power supply. The core of the PFC module consists of switching elements (such as IGBT or MOSFET) and control circuits, responsible for adjusting the waveform of input current to improve overall efficiency.

Introduction To The Internal Principles Of OBC On-Board Chargers from Bonnen Battery

The DC-DC converter is one of the key components of the OBC and is responsible for converting the rectified DC power into voltage and current suitable for battery charging. This part includes the high-frequency transformer, switching tube and output filter, which work together to provide stable and efficient charging current.

The control unit, as the brain of the OBC, monitors and regulates the entire charging process to ensure charging efficiency and safety. This part is usually composed of microcontrollers or microprocessors, which execute complex charging control algorithms to ensure the accuracy and reliability of the charging process.

Introduction To The Internal Principles Of OBC On-Board Chargers from Bonnen Battery

The OBC design also includes charging connection confirmation (CC) and control pilot (CP) systems, which are crucial for ensuring the correct establishment and maintenance of charging connections. The CC system is responsible for detecting the establishment of physical connections, while the CP system sends and receives information about charging status, charging level and fault diagnosis through specific signal lines.

The communication interface enables the OBC to exchange data with other systems of the vehicle (such as the battery management system BMS). This part includes hardware interfaces and communication protocol software to ensure that information is accurately transmitted between systems.

Finally, the role of the cooling system in the OBC cannot be underestimated. It is responsible for keeping the OBC operating within a safe temperature range and may include fans, heat sinks or liquid cooling systems to ensure efficient and stable operation of the entire system.

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