2 edition of Performance of high-speed PWM control chips at cryogenic temperatures found in the catalog.
Performance of high-speed PWM control chips at cryogenic temperatures
by National Aeronautics and Space Administration, Glenn Research Center, Available from NASA Center for Aerospace Information in Cleveland, Ohio, Hanover, MD
Written in English
|Other titles||Performance of high speed PWM control chips at ...|
|Statement||Malik E. Elbuluk ... [et al.].|
|Series||NASA/TM -- 2001-211123., NASA technical memorandum -- 211123.|
|Contributions||NASA Glenn Research Center.|
|The Physical Object|
As part of the NASA Glenn Low Temperature Electronics Program, several commercial high-speed Pulse Width Modulation (PWM) chips have been characterized in terms of their performance as a function of temperature in the range of 25 to °C (liquid nitrogen). #2. PWM is a method of controlling motor (i.e. your fans) by giving the motor a series of really quick on and off commands. This way, you can reduce the speed of your fan without lowering the voltage to the fan. Your motherboard can measure the temperature and .
Analog Applications Journal is a collection of analog application articles designed to give readers a basic understanding of TI products and to provide simple but practical examples for typical applications. In a more recent work Yun et al. verified changes in the microstructure of M2 high speed steel when this material was submitted to different cycles of cryogenic treatment at − °C ().Comparing the conventional quenching cycle “A” with other cryogenic cycles it was observed increases of % in the bending strength, 43% in the toughness and changes in the room temperature and hot Cited by:
Temperature Control of a Hot Plate Using Microcontroller-Based PWM Technique Author: Dept. of Applied Physics University of Dhaka Dhaka, Bangladesh. E-mail: [email protected] Abstract-The temperature of a The research conducted here is a combined hotplate used for prebaking, post baking, dehydration baking etc. changes with time. But,Author: Farzana Alam. In order to maintain a certain rotational speed, motor torque was created by an input current via PWM from the console. PWM is a common technology used in motor control which converts the DC input into a square wave with a variable on-to-off ratio, so the average on-time varies from 0 to percent to control the input power .Theoretically, the duty cycle (between 0 and %) is linearly Cited by: 9.
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In this work. a preliminary evaluation of the performance of four high-speed PWM chips has been conducted as a function of temperature in the range of 25 °C to °C.
These chips ranged in their electrical characteristics, modes of control, packaging options, and Size: KB. commercial high-speed Pulse W idth Modulation (PWM) chips hav e been characterized in terms of their perfor mance as a function of temperature in the range of 25 to – ° C (liquid nitrogen).
Performance of high-speed PWM control chips at cryogenic temperatures Conference Paper in Conference Record - IAS Annual Meeting (IEEE Industry Applications Society) - vol.3. Performance of high-speed PWM control chips at cryogenic temperatures. Get this from a library. Performance of high-speed PWM control chips at cryogenic temperatures.
[NASA Glenn Research Center.;]. In the process of designing low-temperature DC/DC converters, experimental investigations were carried out to evaluate the performance of a number of high-speed PWM chips as a function of.
Low temperature performance of a W, 50 kHz, 24/48 V boost PWM DC-to-DC power converter is reported. The efficiency of the power converter using a molypermalloy powder (MPP) core based inductor went up from 94% at room temperature (23°C) to % at liquid nitrogen temperature (°C).
High speed circuits demand careful attention to layout and component placement. To assure proper perfor-mance of the UC follow these rules: 1) Use a ground plane.
2) Damp or clamp parasitic inductive kick energy from the gate of driven MOSFETs. Do not allow the out-put pins to ring below ground. A series gate resistor or Performance of high-speed PWM control chips at cryogenic temperatures book.
The input clock of the High-Speed PWM module has prescaler (divider) options of towhich can be selected using the PWM Input Clock Prescaler (Divider) Select bits (PCLKDIV>) in the PWM Clock Divider Select register (PTCON2>).File Size: 1MB.
High-Speed PWM Module FEATURES The High-Speed PWM module consists of the following major features: • Up to Nine PWM Generators • Two PWM Outputs per PWM Generator • Individual Time Base and Duty Cycle Control for Each PWM Output • Duty Cycle, Dead Time, Phase Shift and a Frequency Resolution of nsFile Size: KB.
This register is ignored in other PWM modes. 2: The smallest pulse width that can be generated on the PWM output corresponds to a value of 0x, while the maximum pulse width generated corresponds to a value of Period - 0x 3: SDCx Period - 0x produces % duty cycle.
M.E. Elbuluk, A. Hammoud, S. Gerber, R. Patterson, E. OvertonPerformance of high-speed PWM control chips at cryogenic temperatures IEEE Trans Ind Appl, 39 Cited by: 6. Therefore, the temperature of the circuit board or heat sink must be correlated to the die temperature of the high-speed chip.
A better alternative is possible with a number of high-speed chips. Many CPUs, graphics chips, FPGAs, and other high-speed ICs include a "thermal diode", which is actually a diode-connected bipolar transistor, on the die.
The performance of silicon carbide (SiC) diodes and transistors at cold temperatures was evaluated as well. The building and testing (down to degC) of a cryogenic 20 W full bridge power stage for motor drive applications was completed successfully; however.
High-Speed PWM Module. dsPIC33/PIC24 Family Reference Manual DSG-page 2 Microchip Technology Inc. INTRODUCTION This section describes the High-Speed PWM module and its associated operational modes.
The (PWM control or GPIO) - Controls the PWMxH and PWMxL output polarityFile Size: KB. This section describes the High-Speed Pulse-Width Modulator (PWM) module and its associated operational modes.
The High-Speed PWM module in the dsPIC33E/PIC24E device family supports a wide variety of PWM modes and is ideal for power conversion/motor control applications. Some of the common applications include: • AC-to-DC converters.
ing power supplies, PWM control. DESCRIPTION XTR is a family of small footprint PWM controllers de-signed for extreme reliability and high temperature applications such as DC/DC converters and PWM control.
Being able to op-erate from input voltages as high as 35V, XTR PWM con-File Size: 1MB. In short, PWM operates like a switch which constantly cycles on and off, thereby regulating the amount of power the fan or pump motor gains.
The PWM system that is used for controlling fans and pumps works with the motor, either getting +12V (full power) or 0V (no power). To have a better understanding how this works, take a look at the chart.
A two-stage conversion system is described for regulating the DC current in a superconducting coil, for example, the field winding of a superconducting synchronous machine.
An ambient temperature converter provides a low, controlled current to a cryogenic converter, co-located with the superconductor, which steps up the current by over a hundred times to supply the superconducting by: Cryogenic cooling is one of the techniques to improve the machinability of these materials, and found effective specially when machining at high speed.
This chapter sheds light on cryogenic cooling-based machining, its working principle and mechanism, and case studies on cryogenic cooling-based machining of various DTM materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe.Pulse Width Modulation Pulse Width Modulation (PWM) is an on / off action that differs from an on / off differential by changing the length of the “on” time based on how much the actual temperature differs from the desired.
The heating device is operated based on “how much” heat is required.adopts fixed system. Since current mode control is utilized, current is restricted in each cycle and excellent performance is demonstrated in bandwidth and transient response.
At light load, the switching frequency is reduced and high efficiency is achieved. A frequency hopping function is also on chip, which contributes to low Size: 1MB.