Product Realization Of High-power Multiplexing Interleaved Boost Voltage Converter

With the rapid rise of global oil price and the continuous improvement of people’s environmental consciousness, in addition to government policy support, the relevant technologies and products of Hybrid Electric Vehicle(HEV) have gradually been in a hot research. Due to its own requirements, HEV raises a series of new demands, such as high power density, excellent dynamic performance, reliability and durability. This paper designs a Boost DC-DC converter with high power to meet the requirements on HEV cars, which plays a decisive role in the maintenance of vehicle electrical system.This paper innovatively implements a DC-DC converter with digital control instead of the traditional design. Firstly, the background and state of DC-DC converter and switched mode power supply(SMPS) are reviewed. Then based on the real situation, Boost circuit is selected to manipulate control unit. Taking both costs and efficiency into account, the crucial voltage conversion is accomplished by an innovative way of multiplexing synchronous interweaved PWM signals, with microprocessor swiftly toggling between different operating modes. Open-loop and closed-loop are designed for different control goals and the feedback compensation network is implemented by digital signal processor, including voltage comparation and error amplification. In the aspect of amplifier, design refers to digital filter method, then modeling, calculation and simulation are carried out. Finally, after deciding the test scheme and setting up the platform, verification is conducted through specific experiments.Test results show that both function and performance of our designed DC-DC converter meet the expectation, and it can be applied in HEV after follow-up optimization and debugging. Compared with traditional voltage converter, the converter we designed achieves smaller volume and higher efficiency. It not only shortens the development cycle, but also decreases the overall costs, which is of high practicability. Digitalization has become a popular trend across the world, this paper demonstrates the feasibility and commercial value of digital control through the actual product.