12 V INTERMEDIATE BUS ARCHITECTURE
12 V INTERMEDIATE BUS ARCHITECTURE AS THE NEW STANDARD FOR ON-BOARD POWER SUPPLY SOLUTIONS. WILL THIS SYSTEM RESULT IN A NEW REALITY BY "HIGH END PERFORMANCE - AT A LOW COST PRICE LEVEL"?
Modern chips require higher and higher currents - whilst voltages are falling towards 1 V. Bringing the voltage to the correct level using conventional technology and normal cable cross-sections is almost impossible.
New supply architectures means that on the one hand the power supply is massively simplified and on the other there is no need for high cost DC/DC modules.
The following problems can be solved at a stroke using the magic words "12 Volt intermediate bus":
The power loss created in the CD transformer and its waste heat are easy to handle - even if there are limited cooling facilities on board (natural convection).
The design size of the voltage controller shrinks to what to date has been an unachievable power density.
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The high number of voltage levels on board requires sharply falling prices for a growing number of control stages.
The transformers are tested separately by "burn in" - that is not really feasible on a fully fitted board.The modules must be soldered during the planned procedures - additional manual fitting is not generally possible.
The solution, which now appears to becoming established as standard, is as follows:
Stage I: DC/DC transformer
The 48 V battery voltage is transformed to a 12 V intermediate circuit voltage at low cost using a slimline DC/DC transformer (quasi-transformer).
The transformer has insulation of 2 kV to guarantee isolation from the mains supply and the required self-protection functions that ensure trouble-free operation.
By eliminating complicated control mechanisms it is possible to achieve an efficiency level of up to 95% - and the price level falls to that of simple transformers.
Stage II: Long range point of load transformer
The 12 V intermediate circuit voltage is transformer to the required chip voltage level on the board using tiny switching controllers. These controller modules are very small with no galvanic separation and feature high efficiency with a low cost factor.
The standardisation relates to the design size, pin configuration and basic functionality of the transformer modules, which ensures that second sourcing is possible.
Are you already searching for solutions like this. Contact the following for practical guidance:
Michael Schrutka, EXT 31
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