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This paper presents the design of a zero-voltage-ripple (ZVR) buck dc-dc converter. The circuit uses an autotransformer for ripple cancellation in the output voltage. The principle of operation is discussed in brief. The relationship between the currents through the magnetizing inductance and the auto-transformer windings is developed. The auxiliary inductance for ripple cancellation in series with...
A Li-ion battery charger with dual input source capability and high efficiency is proposed in this work. An internal source determination circuit could choose the sufficient energy source for charging system. Also, a new approach of smooth transition to avoid oscillation between charging mode switching is used through current-mode-like smooth transition circuit. Pulse frequency modulation with adaptive...
The future naval surface combatant will be an all-electric medium-voltage dc integrated power and energy system; capable of supporting future dynamic loads, such as electric weapons and sensors. This system will be different from typical terrestrial distribution systems in that current carrying conductors are in close proximity to the conductive ship hull structure, and there is no well-defined ‘earth’...
A highly linear bridge-based constant voltage and constant current ISFET pH sensor readout circuit is proposed. In this scheme, a compact and low power pH sensor readout circuit is realized by using only one opamp and three MOSFETs without degrading the accuracy. The proposed circuit is implemented using standard CMOS 0.18 μm technology that shows chemical sensitivity of −37mV/pH, power consumption...
With the rapid development of emerging wireless technologies, we can see the importance of the Internet of Things (IoT). The IoT is a concept of connecting everything to everywhere at all times. Essential properties of IoT involve not only database and gateway communication, but also sensor communication. This paper introduces the basic approach of understanding how analog digital conversion works...
A 4 kb fully differential 8-port SRAM bitcell array (6 read ports and 2 write ports) is presented in this paper. This 8-port SRAM provides simultaneous access, high system throughput and a great read static noise margin by isolating the read ports from storage nodes. At 0.4 V supply voltage, designed 8-port SRAM bitcell shows 123, 137 and 123 mV static noise margin during read, write and standby modes,...
The proposed circuit aims to harvest energy from freight railcars, in which a three-phase electromagnetic generator (EMG) is used to harvest kinetic energy. The key idea of the proposed circuit is to extract maximum power from the EMG through impedance matching until the charge level of the battery reaches 90%. Once, the battery reaches the charge level, it switches the operation mode and regulates...
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