1,720,961 research outputs found
HV-CMOS design and characterization of a smart rotor coil driver for automotive alternators
No full textThe work presents a single-chip integrated Rotor Coil Driver (RCD) that can be used in automotive alternators. It integrates the power switch with the control circuitry and the diagnostics; with respect to the state of the art new functionalities are integrated such as full reverse polarity protection and programmable output slope control against in-rush currents and current spike transients. The paper will discuss the driver IC design from the choice of the architecture to the real silicon implementation. The proposed innovative RCD has been implemented in a 0.35 ìm HV-CMOS technology and has been embedded in a mechatronic brush-holder regulator system-onchip for an automotive alternator. The simulation results and experimental measurements prove the effectiveness of the proposed RCD facing the harshest automotive conditions
A high voltage high power high frequency boost/flyback DC-DC converter for automotive applications
No full textThis work aims to present an High Voltage High Power and High Frequency CMOS DC-DC converter able to work in both Flyback and Boost configurations, designed for automotive applications. The system, implemented in Austriamicrosystems 0.35um HVCMOS technology, is able to manage input voltages from 2.5V up to 36V and generates a programmable output voltage from 6 to 36V with an output current up to 900mA. To improve EMC/EMI system performances, dithering of switching frequency and slope controlling of the gate driver have been implemented
Gate recognition and netlist reduction for switch-level simulation of dynamic bit-level systolic arrays
No full textA Flexible LED Driver for Automotive Lighting Applications: IC Design and Experimental Characterization
No full textThis letter presents a smart driver for LEDs, particularly for automotive lighting applications, which avoid ringing and overshoot phenomena. To this aim, advanced Soft Start and Current Slope Control techniques are integrated on-chip. This letter discusses the driver design integrating in high voltage CMOS technology, the digital circuitry for programming and electronic control units interfacing, and the power devices up to 10 W. Experimental characterizations with LEDs of different power levels and with different types of connections are showed. The smart driver sustains automotive temperature and voltage requirements; moreover it has high power efficiency, it is programmable, and can be configured to work as a linear regulator (for low current LEDs) or in switch mode (for higher power LEDs)
Design and Test of an HV-CMOS Intelligent Power Switch With Integrated Protections and Self-Diagnostic for Harsh Automotive Applications
No full textThe design and characterization in high-voltage (HV)-CMOS technology of an innovative intelligent power switch (IPS) for harsh automotive applications is proposed in this paper. To safely handle the ordinary and extraordinary automotive electrical and environmental conditions, a systematic design flow is followed: several design solutions are presented at the architectural and circuital level, integrating on-chip self-diagnostic capabilities and full protection against the high voltage and reverse polarity, the effects of wiring parasitics, and the over-current and over-temperature phenomena. Moreover, the current slope and soft start integrated techniques ensure a low electromagnetic interference, and the IPS is also configurable to efficiently drive different interchangeable loads. The innovative IPS has been implemented in a 0.35-mu m HV-CMOS technology and has been embedded in mechatronic third generation brush-holder regulator system-on-chip for an automotive alternator. The electrical simulations and experimental characterization and the testing at component and on-board system levels prove that the proposed design allows a compact and smart power switch realization facing the harshest automotive conditions
A startup circuit for even-stage differential ring oscillators
No full textIf not properly initiated, even-stage ring oscillators may resonate in undesirable ways. When this occurs, their output frequency can be higher than expected and they can no longer be employed as VCOs in PLL designs. In this paper, we analyze this issue and then we propose a novel startup circuit that can be used in differential, even-stage ring oscillators. This design is produced using a 0.30 μm CMOS process. Measurements performed on test chips show that our circuit always prevents spurious oscillation modes from arising. On the contrary, if the proper startup is disabled, unwanted modes may occur, especially at low temperatures or with little bias current. Moreover, consisting of just two MOSFETs per oscillator stage, the proposed circuit is also very simple and efficient in terms of area and power dissipation
Characterization of an Intelligent Power Switch for LED driving with control of wiring parasitics effects
No full textThe flexibility of an Intelligent Power Switch (IPS) designed in HV-CMOS technology for incandescent lamp in automotive scenarios has been evaluated for the driving of a LED in presence of wiring parasitics. The paper presents how it is possible, through proper reconfiguration of the flexible IPS, to reduce the undesired ringing phenomenon when driving a LED with wiring parasitics thus reducing Electromagnetic Interferences (EMI) and spikes on supply voltage. Electrical simulation and experimental measurements prove the effectiveness of the proposed IP
An Integrated Smart Driver for Inductive Loads with Self-monitoring/diagnostic Capability
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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