[introduction]After tesla begins to use 48V system, appeared in electric field and communication framework domain new trend, 48V area framework is making the crucial technology that improves electric car function and efficiency.

After tesla begins to use 48V system, appeared in electric field and communication framework domain new trend, 48V area framework is making the crucial technology that improves electric car function and efficiency.

In the plan of tesla, still preserved traditional 48V battery, power source module can provide main effect in network of whole power source. How to design about this respect, vicor introduced 48V area framework how to optimize batteries report to use car (BEV) batteries system, this is one kind is compared valuable before the plan of look up.

Of course we also see, around the plan switch of 12V and 48V, to low-pressure and electric framework the influence is very big, still be before at present so of look up think give priority to.

The challenge of system of Part 1 electric car

The main challenge that electric car system faces includes complexity of the compatibility with roadside charger, system processing, weight is the least change and power dissipation. Transfer gradually from 12V as pure dynamoelectric load 48V, include load of electric machinery load, blame electric machinery (the computational platform that is like intelligent car, heat windshield) with functional security load (be like dynamoelectric aid force to change direction, intelligent electron apply the brake) , these challenges become more complex.

● system complexity: As the addition of electric car function, electrical system becomes more complex, framework of traditional collect Chinese style satisfies requirement hard.
● compatibility problem: Of different volt standard fill a power station (400V and 800V) between existence compatibility problem, bring about charge disadvantageous.
● weight and medicinal powder hot: Electric car need is decreased as far as possible weight is measured and come loose effectively hot, in order to improve add boat course of development and systematic efficiency.

Will look from this piece of graph, basically included 12V and 48V load, truckload low-pressure load is transmitted through 48V, the electric load of 12V is to pass 48V to have transition.

The electron that changes to area from collect Chinese style is electric (E/E) framework change, it is to answer the laden demand that increases increasingly.

Area E/E framework provided high-powered computation unit, pass CAN bus line and join of car aether net, realized more efficient load management and power source to allocate.

48V PDN delivers a network to arrive in batteries bag through compositive charger and 48V power source, solved 400V and 800V to charge the incompatible sex problem between infrastructure. This kind compositive reduced quantity of heat, cost and weight not only, still improved integral efficiency of the system.

Part 2 devises plan


From the point of whole, the 48V area PDN that uses module of high density power source brought the profit of many sided, include to reduce systematic weight, dimension and complexity, offer flexibility and but expansibility, accelerate appear on the market time, simplify power source delivers a network, reduce the weight of wiring harness and cost.

Through be in batteries system is assembled in compositive 48V changeover, car can decrease to assemble time in the factory, pass compositive and economic cost.

48V PDN solution includes to use the component such as BCM6135 and PRM3735, these component offerred tall transient state to answer with efficiency, and stable adjustment outputs voltage. The application of these power source component, make 48V and 12V load can manage effectively and allocate.

To reduce the dimension of PDN and weight further, put forward to use the concept of fictitious batteries, be eliminated with the means of innovation or the smallest the requirement that changes battery.

To make the BEV of 800V can be in of 400V fill a power station to charge, be based on the charger of Vicor NBM9280 collateral solution, also can keep high-powered when cooling fluid temperature is 50 ° C.

Module of high density power source (the NBM9280 that is like Vicor and BCM6135) , can improve a system further efficiency and answer speed. These module have the following advantage:

● is efficient: The peak value efficiency that BCM6135 issues in 800V input voltage can be amounted to 97.3% .
● tall transient state answers: When load current changes quickly, can hold stable output.
● is modular design: Module of every power source is OK and relaxed shunt-wound or patulous, in order to get used to different power demand, differ to 20kW from 1kW.

From the point of the result, pass smaller power module guide, distributed framework compared with original collect Chinese style electric framework, can bring lighter result.

To manage better and allot electric power, the car is electric framework the distributed framework from in the past, center a framework through present region, evolve into the area framework that is future gradually. Area framework carries high-powered computation unit and area control unit (ZCU) , realize more efficient electric power management and lower systematic complexity.

Brief summary

This kind of 48V area framework around power source module, optimize through using low-pressure distribution system, reduced systematic weight and complexity not only, still offerred flexibility and but expansibility. From what design the level or have a characteristic very much!

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