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- W606136812 abstract "Reduction of RF emissions is very crucial for better EMI performance in electrical equipment,for instance installed in automobiles. In this thesis, a flexible curve shaping module for a dcto-dc PWM converter is developed to achieve efficient reduction of RF emission.The design of the curve shaping module employs a programmable logic circuit (CPLD) wherea lookup table is stored with a certain reference curve shape. A D/A converter converts thedigital signal from the CPLD to analogue signal which is then fed to power stage to reproducethe reference curve shape on the output. This output signal can be fed to electrical load. Theaim with the module is to employ different lookup tables corresponding to different curveshapes resulting in flexibility of the circuit.Frequency response for different curve shapes i.e. trapezoidal, sinusoidal and low pass filterresponse were studied in theory for comparing their EMI performance. These curves are alsoimplemented in the real circuit for checking the response from the power stage.By evaluating the practical circuit, it was found out that RF emissions were loweredcompared to hard switching techniques. Moreover various curve shapes were followed withsufficient accuracy on the output of the power stage with resistive load. When inductiveloading is attached to the output of the power stage, the circuit enhances problems associatedwith controllability." @default.
- W606136812 created "2016-06-24" @default.
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- W606136812 creator A5036769787 @default.
- W606136812 date "2004-01-01" @default.
- W606136812 modified "2023-09-23" @default.
- W606136812 title "Reduction of the amplitude of higher order harmonic frequencies in pulsed electrical signals" @default.
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- W606136812 hasPublicationYear "2004" @default.
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