In recent years, attention is being given to 42V power supply technology for solving the problem of increased power demand in vehicles. Since 2001, Toyota Motor Corporation has been marketing a mild hybrid system (THS-M) in order to further improve fuel economy and reduce emissions; this system requires both 42V and 14V power sources.The THS-M system consists of a 42V motor generator (M/G) connected to the engine crankshaft with a belt; an inverter; a 36V battery; a DC/DC converter for stepping down the 42V power supply to a conventional 12V battery; and high-power related electrical components. These components require additional costs, which must be reduced in order to increase the sales volume of THS-M vehicles.We have devised a method to eliminate the conventional DC/DC converter from the THS-M, and as a result we have developed a new, revolutionary power conversion system (multi-function inverter). Instead of using a DC/DC converter, we derived a 14V power line from the neutral point of the motor generator, and added a reactor (a type of smoothing inductor) in this line for reducing ripple.In addition, we applied a new inverter switching system which allows us to simultaneously and independently control both the 14V and 42V system voltages, which are taken from the motor-generator drive, and connected to the 12V and 36V batteries, respectively.The paper reports on the principle of operation and the test results, including torque and efficiency characteristics of the multi-function inverter.
Novel Power Conversion System for Cost Reduction in Vehicles with 42V/14V Power Supply
Sae Technical Papers
SAE 2003 World Congress & Exhibition ; 2003
2003-03-03
Conference paper
English
Novel power conversion system for cost reduction in vehicles with 42V/14V power supply
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