Improved data acquisition architecture for an LLC converter
Julian, Alexander L.
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The goal of this thesis is to replace a voltage-to-frequency (V/f) converter in the given inductor-inductor-capacitor (LLC) converter with an analog-to-digital (A/D) converter to prevent a field-programmable gate array (FPGA) from needing to monitor signals continuously. The proposed signal and sensor design alternative is to use A/D converters for the voltage and the battery temperature measurements, and to send only one gate signal that can be used to drive both MOSFETs in the LLC converter. Two candidates are considered for the A/D converter. The first solution is the AD7792/7793 A/D converter, which can monitor both the voltage and the temperature simultaneously. The AD7792/7793 transmits one data signal to the FPGA and receives three data signals from the FPGA. The second solution is the ADS1000, which uses the I2C protocol to communicate with the FPGA. The ADS1000 receives the read/write command and clock data from the FPGA and sends converted digital data to the FPGA. For efficient processing, we recommend the use of the ADS1000, since the FPGA and the A/D converter have bidirectional communication capabilities and the AD7792/7793 requires more optocouplers, more space, and more wires in the circuit.
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