One approach that can help reducing hardware design and test efforts, cost and cycle times during the development process is state-of-the-art circuit modelling and simulation. Hence, several hardware setups may be required that have to be designed, assembled, tested, and redesigned. the supply voltage range, the current level, the ambient temperature, acceptable EMI levels etc.
But even within one specific application, the operating conditions may vary a lot between customers (model types), e.g. MOSFETs and Driver ICs are chosen to meet the electrical requirements, primarily the voltage and current levels, package size, reliability targets, thermal and cost constraints etc. The power electronics of the motor drive consists of a Driver IC, one, two or three MOSFET half bridges and passive components. Usually, they are operated on the 12 V power net and draw between and 1 Amps depending on demand, application and OEM. The electric motors are in most cases DC brush motors or EC motors, which are electronically commutated.
The motivation to move away from belt-driven solutions to electrically actuated solutions may include increased fuel economy, vehicle installation and packaging constraints, increased feature set, safety and/or convenience, simplified assembly and modular testability prior and during vehicle manufacturing. 2 Introduction Powerful electric motors to drive fuel pumps and water pumps, cooling fans and HVAC blowers, deliver steering assist and shift gears find their way into modern cars. The simulation results are compared with measurements performed on an evaluation board. As a result, a ready-to-use circuit model is obtained which allows the analysis and the re-design of the power stage later on. The simulation is based on common requirements for automotive applications. Starting with an explanation how to use the MOSFET and driver IC PSpice models, what they are capable for an example of a simulated EC motor drive will be presented.
1 Application Note, V 1., March 28 Simulation with PSpice Automotive MOSFETs and Driver ICs Marco Pürschel & Andreas Kiep Automotive Power N e v e r s t o p t h i n k i n g.Ģ Table of Content 1 Abstract Introduction EC Motor Drive PSpice Simulation models MOSFET models Driver IC model EC Motor Drive: Modelling of the power stage Conclusion.11 Application Noteģ 1 Abstract This Application Note presents a way how to simulate a typical high current EC motor drive power stage using PSpice.
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