The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Due to their high storage capacity, low self-discharge rate and long lifetime Lithium-Ion batteries are key elements for the emerging electro-mobility and for stationary “Battery Electrical Storage Systems” (BESS). However, Li-Ion batteries are still very expensive and must be handled very carefully to exploit their features optimally. Hence, “Battery Management Systems” (BMS) have been developed...
We present an electro-optic voltage sensor using bismuth germanate in a novel oil- and gas-free insulator. The performance is verified under varying external conditions. Accuracy within ±0.2% between −40 °C and +80 °C is demonstrated.
Distribution voltage and current sensors must be designed to be economical to install and robust in their design to survive the elements. Various design and routine tests are recommended to help insure the survivability of these sensors. Available existing sensor technologies are described along with typical accuracies that can be expected from sensors, and complete integrated sensor systems, in the...
The temperature drift of measurement accuracy is one of the primary causes in the practical process of optical voltage sensor. This paper presents a kind of self-healing optical voltage sensor technology to overcome above problem. The technology combines self-healing and optical voltage sensing techniques to implement the synchronous compensation of disturbing birefringence and the transistor half-wave...
Distribution voltage and current sensors must be designed to be economical to install and robust in their design to survive the elements. Various design and routine tests are recommended to help insure the survivability of these sensors. Available existing sensor technologies are described along with typical accuracies that can be expected from sensors, and complete integrated sensor systems, in the...
Utilization of digital control in the design of power controllers provides designers with the capability to monitor multiple operational parameters of a power converter. This functionality is often harder to achieve with converter designs based on analog controllers. The reason for this difference is that the information used for internal control purposes in the case of a digital controller is digitized,...
Microprocessor chips employ increasingly larger number of thermal sensing devices. These devices are networked by an underlying infrastructure, which provides bias currents to sensing devices and collects measurements. In this work, we address the optimization of the bias current distribution network utilized by the sensing devices. We show that the choice between two fundamental topologies (the 2-wire...
Smart temperature sensors generally need to be trimmed to obtain measurement errors below ??2??C. The associated temperature calibration procedure is time consuming and therefore costly. This paper presents two, much faster, voltage calibration techniques. Both make use of the fact that a voltage proportional to absolute temperature (PTAT) can be accurately generated on chip. By measuring this voltage,...
Smart temperature sensors generally need to be trimmed to obtain inaccuracies below plusmn2degC. The associated calibration procedure is time consuming and therefore costly. This paper presents two voltage calibration techniques that are much faster than conventional temperature techniques. Both make use of the fact that a voltage proportional to absolute temperature (PTAT) can be accurately generated...
A high bandwidth critical path monitor (1 sample/ cycle at 4-5 GHz) capable of providing real-time timing margin information to a variable voltage/frequency scaling control loop is described. The critical path monitor tracks the critical path delay to within 1 FO2 inverter delay with a standard deviation less than 3 FO2 delays over process, voltage, temperature, and workload. The CPM is sensitive...
In this study, we fabricated in-plane thermoelectric micro-generators (4 mm times 4 mm) based on bismuth telluride thin films by using flash evaporation method. The thermoelectric properties of as-grown thin films are lower than those of bulk materials. Therefore the as-grown thin films were annealed in hydrogen at atmospheric pressure for 1 hour in a temperature range of 200 degC. to 400degC. By...
A 53 dB gain limiting amplifier for OC-192 and 10 GbE applications is developed in a 50 GHz fT SiGe SOI complimentary bipolar process, and has 5 mV pk-pk sensitivity, 1.25 V pk-pk maximum input signal, 14 ps (20/80%) rise/fall times and 450 mV pk-pk output into matched differential 50 Ohm loads, consuming 430 mW on a 3.3 V supply. Input Cherry-Hooper gain stages limit the -3 dB bandwidth to 11 GHz...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.