||The reaserch in the thesis is mainly associated with Battery Management Systems (BMS) in Electronic Vehicles(EV), especially regarding thermal sensor and boost converter design. In order to resolve the uncertainty of thermal sensing and poor efficiency of voltage converters, a process compensation and non-linear calibration temperature detector and a hysteresis current-controlled boost converter are proposed, respectively.|
Temperature monitoring is one of the most important issues for BMS. The proposed temperature detector in the first topic of this thesis uses two temperature sensors with the same structure to cancel the process offset and increase the linearity. Then the output voltage of each sensor with different characteristics is enlarged by using a buffer and resistors to meet the requirement. Furthermore, a process compensation adder is utilized to sum up these two voltages from the buffers and to cancel the process offset. The proposed detector are measured on silicon within -40 150 °C, where the worst deviation is -2.05~+2.06 °C.
A hysteresis current-controlled boost converter is proposed in the second part of the thesis to resolve the fast response and reliability problems. Current detection mode and synchronous switches are included to enhance efficiency. Moreover, when the converter
operates in a discontinuous conduction mode, smaller output voltage ripple and higher line regulation are achieved by hysteresis control. Besides, the converter uses current controlled mode to fasten the response. Measurement results show that output voltage
cannot reach higher than 3.6V, because the circuit was not well-designed. However, it may meet the specifications in the future if a body switch circuit is added in our design.