As China's automobile industry enters a new stage of development, in recent years, China has continuously advocated the development of energy-saving vehicles including new energy vehicles. Among them, electric vehicles ( EV) have become a hot spot, while on-board charging (OBC) is an application of electric vehicles An important part of Based on market demand, Beyond International pushes the MCU controller and related solutions of Microchip in OBC applications.

OBC architecture

At present, the power levels of vehicle-mounted chargers are: 3.3KW, 6.6KW , 11KW, etc. Previously limited to weight and size, there were few chargers over 11KW, but with the increasing demand for fast charging in the market, the power of chargers is developing towards 11KW and above.

OBC charging block diagram

Implementation of OBC topology

At present, high-power OBCs are gradually adopting digital solutions. The dsPIC33EP "GS" series products introduced by Microchip have excellent performance and can implement more complex nonlinear prediction and adaptive control algorithms at higher switching frequencies. These advanced algorithms enable power design to achieve better energy efficiency and power specifications. In addition, dsPIC33EP "GS" devices can reduce the delay by half when applied to a three-pole three-zero compensator, and can save up to 80% of energy consumption in any application. It is applied to automotive OBC design, providing high efficiency and high power factor, wide AC input voltage range, and high charging efficiency. Microchip also provides a digital power demo board.

development tools

Microchip provides a digital power design kit including digital compensation design tool (DCDT), MPLAB code configurator (MCC), Microchip compensator library and design examples. The combination of these four software packages can provide tools and necessary guidance for the development of a complete digital power supply design. Once the initial simulation model of the user 's design is ready, DCDT can be used to analyze the design and feedback transfer function and generate compensation coefficients. Device initialization code can be generated with the help of MCC, and the final firmware can be created with the help of code examples and codes generated by MCC and DCDT.

The total  knot

The development trend of OBC chargers is digital control systems. The dsPIC33EP "GS" series of control chips and related development tools provided by Beyond International and Microchip can shorten the time for high-power and digitization of OBC products and accelerate the time to market for customers' products.