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This paper proposes a voltage reference operating up to 170 °C for low-power high-temperature systems. The proposed circuit buffers body voltages to avoid degradation of temperature coefficient from nwell/psub diode leakage. For low power overhead, it measures the diode leakage and adaptively adjusts the bias current of the buffers. This enables low power consumption at low temperature, which can...
This paper discusses design techniques that enable transduction and digitization of temperature at very low power levels. An example architecture is presented that transduces temperature in a fully-integrated CMOS chip by charging a pair of digitally-controllable integrated capacitors with a pair of pA current sources that are proportional-to and constant-with temperature, respectively, and digitally...
A method for in-situ high bandwidth junction temperature estimation of Insulated Gate Bipolar Transistors (IGBTs) is introduced. The method is based on the acquisition of the gate voltage plateau during turn-on, which can be directly related to the junction temperature. This allows fast over temperature protection of the power device and thus enables operation at the boundary of the device safe operation...
The paper deals with real-time estimation of the junction temperature of a SiC power MOSFET modules. The junction temperature of one device of the module is real-time estimated by measuring its current and on-state voltage at each time sample, and entering the temperature model of the device. The temperature model is obtained in a dedicated commissioning session, where the vON is measured at different...
This paper presents a demonstrator of a Lithiumion battery for automotive applications. A printed circuit board consisting of sensors, local memory elements, a digital signal processing unit and a communication interface is integrated into a Lithium-ion cell case. We demonstrate the mechanical and electrical feasibility of addressing and real-time monitoring of single Lithium-ion battery cells using...
Total ionizing dose effects in analog configurable application specific integrated circuits such as analog gate array and programmable analog gate array were analyzed. Dominant failure mechanisms and potentially radiation sensitive internal units were determined within −60…+125C temperature range. +125C area corresponds to the minimal radiation hardness.
A CMOS fully-integrated Coulomb counter based on a voltage-to-frequency conversion algorithm that measures the state-of-charge (SoC) of a high-density Li-ion battery is presented. Low-side current sensing with a polarity detector is used to monitor the charging and discharging battery current. It is designed in 0.35 μm CMOS process and occupies an active area of 0.01mm2. Except for the sensing resistor...
TID effects in the metal-insulator-semiconductor field-effect transistors (RADFETs) were experimentally investigated at the different chip temperatures by means of measurements the electrical characteristics before, during and after irradiations in wide range of gate voltages.
Recent growth of power semiconductor device market has been driven largely by the growing demand for an efficient way to convert and distribute energy in the field of renewable energy, electrical vehicles, aerospace, marine and applications. For safety, critical applications, temperature management and control are the most important functions. Therefore, estimating or measuring the junction temperature...
This paper presents a new gate driver concept that consists of an integrated measurement of the junction temperature and the load current of a power module during inverter operation. For junction temperature measurement the gate driver identifies the temperature sensitive on-chip internal gate resistor by means of a small identification signal that is modulated onto the positive gate voltage. To determine...
The proposed digital sensor measures both temperature and voltage simultaneously in field. The sensor is ring oscillator (RO)-based and its design is fully digital. Its measurement time is shorter than the conventional analog sensors' and it can be placed at any place such as the boundary of a CPU core, GPU core, or Memory. This paper investigates the accuracy of the sensor derived from reduction...
The thermocouple (TC) whose error can be arbitrarily adjusted is proposed in this paper. Its error of method, that occurs in this case, is studied. It is shown that the error of method depends on the size and material of the additional legs. The way of radical reduction of the error of method is proposed. The proposed TC practically solves the problem of complete experimental research for the techniques...
The Photonics and Instrumentation Laboratory (LIF) at the Universidade Federal do Rio de Janeiro is a R&D laboratory mainly involved in optical sensors applied to Energy, Oil & Gas and Biotechnology areas. This paper demonstrates some techniques used by LIF to measure, detect and monitor several physical parameters applying plastic optical fiber (POF) either as sensor or as a communication...
Total dose radiation response of the n-channel 2N7002 transistors was examined at different temperatures. Voltage-current characteristics of the devices were measured before and after irradiation in wide temperature range from 80 K to 350 K.
The paper deals with the development and the performance characterization of model-based health-monitoring algorithms for the detection of faults in an electro-mechanical flight control actuator for unmanned aerial system flight controls. Two real-time executable position-tracking algorithms, based on predictors with different levels of complexity, are developed and compared in terms of false alarms...
In the last few years, Unmanned Aerial Systems (UAS) have been attracting enormous research interest, being employed in military and civilian missions (e.g. search and rescue, disaster assessment, urban traffic monitoring, 3D mapping, etc.) that would be risky or impossible for a human to perform. For autonomous or aided operations (e.g. automatic or aided landing), it is crucial to have on board...
In this paper, a functional principle for a broadband thermal detector suited for a monolithical integration is shown. Two tantalum load resistors are heated by an input signal, while the temperature at a fixed distance is recorded on chip with a differential temperature sensing bridge. An integrated differential to single-ended stage amplifies the bridges differential voltage and provides an output...
Implementation of precision apiculture methods into practice is highly depended on availability and cost-effectiveness of honey bee monitoring equipment. Expenses of monitoring system installation and maintenance activities also should be minimized. In order to successfully predict different bee colony states like: swarming, determine nectar collection activity and health of honey bees both in active...
This paper covers the design and development of a custom portable equipment, which monitors gas concentrations from new types of microsensors, stores all the data and makes it available in digital format. Using sensors with information technology will lead to improving quality and safety of the climate.
In this work, we propose the development of monitoring system for the Air Handling Unit of a particular building of the University via Zigbee network. The proposed system will provide all the essential information required for the thermal modeling of the building using Dynamic Thermal Simulation. Furthermore, this will allow us to accomplish autonomous building management and also to study the thermal...
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