Within the electrical architecture of new energy vehicles, the on-board DC-DC converter is a critical component for power conversion and distribution. It primarily belongs to the vehicle's high-voltage power distribution and power management system, serving as the core interface connecting the high-voltage traction battery to the vehicle's low-voltage electrical network.

I. Core Functional Definition

Its primary function is to efficiently and safely convert the high-voltage direct current from the traction battery (e.g., 400V or 800V) into the stable low-voltage direct current required by the entire vehicle (typically 12V or 24V/48V) through power electronics conversion technology, thereby continuously powering all low-voltage electrical systems.

From a systemic perspective, it ensures that when the high-voltage traction battery acts as the sole primary energy source, all vehicle controllers, sensors, actuators, and accessories receive a continuous, clean, and reliable power supply. Its performance and reliability directly determine the stability of the low-voltage electrical network, forming the fundamental prerequisite for the normal operation of all electronic and electrical functions in the vehicle.

II. Specific Role in Smart Chassis Systems

For intelligent functions such as by-wire chassis and advanced braking systems, a stable and reliable low-voltage power supply is their lifeline for achieving high-precision and high-reliability control. The on-board DC-DC converter plays an indispensable "power assurance" role in this context:

1. Providing Base Power for By-Wire Actuation Systems: Key components of by-wire brake, steer-by-wire, and active suspension systems—such as Electronic Control Units, sensors (e.g., displacement, pressure, torque sensors), and solenoid valves—all depend on a stable low-voltage power supply to operate. The output voltage accuracy and ripple characteristics of the DC-DC converter directly impact the signal quality and operational stability of these precision control circuits.
2. Ensuring Safe Operation of Braking Systems: The core electronic control sections of both traditional ESP/ABS hydraulic control units and next-generation brake-by-wire system motor drives and controllers belong to low-voltage loads. The DC-DC converter must guarantee uninterrupted and interference-free power supply to the braking controller under all operating conditions, especially during voltage transients caused by sudden acceleration or deceleration. This is a fundamental functional safety requirement.
3. Supporting High-Power Demand of Smart Chassis Domain Controllers: Integrated chassis domain controllers are becoming increasingly powerful, with correspondingly higher power consumption. Modern high-power DC-DC converters (with output power up to 2-3kW) can meet the growing power demands of such high-performance computing units, ensuring the stable execution of complex协同 control algorithms.
4. Enabling Efficient Whole-Vehicle Energy Management: Its conversion efficiency directly impacts overall vehicle energy consumption. A high-efficiency DC-DC converter reduces unnecessary energy loss, contributing practically to extending the driving range of new energy vehicles.

III. Key Technical Implementation Requirements

From a technical implementation standpoint, on-board DC-DC converters must meet several stringent requirements:

• Electrical Safety Isolation: Reliable electrical isolation between the high-voltage input and low-voltage output must be achieved through designs like high-frequency transformers to comply with safety standards.
• High Conversion Efficiency and Power Density: High efficiency (e.g., >95%) must be maintained across the entire load range, and high power output must be achieved within a limited space, posing challenges for thermal design and power device selection.
• Excellent Electromagnetic Compatibility: Their switching operation modes must not cause electromagnetic interference to sensitive in-vehicle chassis control networks (e.g., CAN FD, FlexRay) and sensor signals.
• High Functional Safety Level: The design must adhere to the ISO 26262 standard, incorporating comprehensive fault diagnosis and protection mechanisms (such as over-voltage, over-current, and over-temperature protection) to ensure safe failure without affecting critical chassis functions in case of a fault.

IV. HOLS Automation's Manufacturing Solutions

HOLS Automation deeply understands that the manufacturing quality, consistency, and reliability of automotive power electronic components, such as DC-DC converters, are the cornerstone for ensuring the overall performance of smart chassis systems. These products integrate precision power electronics, magnetic components, and complex controls, placing extremely high demands on manufacturing processes.

For the production of this core component, we provide professional automated production line solutions:

• Precision Power Electronics Assembly: Covers high-precision SMT placement, high-current terminal crimping, and precision soldering and thermal paste application for power modules (e.g., SiC MOSFETs).
• Critical Magnetic Component Processing: Provides automated winding, assembly, and performance testing units for high-frequency transformers and inductors, ensuring consistency in their electrical parameters.
• System Integration and Testing: The production line integrates automated functional test stations that simulate real vehicle operating conditions. It performs fully automated calibration and testing of the converter's efficiency curve, load regulation, ripple noise, protection functions, and CAN communication, ensuring every off-line product meets design specifications.

Conclusion

As a key node in the energy distribution network of new energy vehicles, the performance and reliability of the on-board DC-DC converter form the foundational guarantee for the implementation and stable operation of advanced chassis functions, including brake-by-wire and intelligent suspension. Its importance will become increasingly prominent with the centralized and intelligent development of vehicle electrical/electronic architectures.

Leveraging its deep expertise in the intelligent manufacturing of core automotive components, HOLS Automation is committed to providing highly reliable and flexible automated production and testing solutions for key electronic control components of smart chassis, including DC-DC converters. We assist customers in building stable and reliable supply chain systems, jointly advancing the industrialization of smart chassis technology.