Design and Implementation of High-Speed Dual-Modulus

2011 ◽  
Vol 109 ◽  
pp. 271-275
Author(s):  
Jian Jun Song ◽  
Liu Sun ◽  
He Ming Zhang ◽  
Hui Yong Hu
Keyword(s):  
Power Supply ◽  
Dynamic Load ◽  
High Speed ◽  
Operating Speed ◽  
Switching Circuit ◽  
Switching Sequence ◽  
Phase Switching ◽  
Measurement Result ◽  
Design And Implementation ◽  
Supply Current

This paper presents a new enhanced phase switching 15/16 dual-modulus prescaler. One more divide-by-2 stage was employed in the design compare to the conventional phase switching architecture. Since the operating speed of phase switching circuit is obviously reduced. The inverse phase switching sequence was employed in this circuit to implement glitch-free phase switching. Further more, a dynamic load master-slave DFF was employed as the first divide-by-2 stage which can increase the operating frequency of prescaler. Measurement result shows, this dual-modulus prescaler can operate at 3GHz-200MHz with 2.8mA supply current at 1.8V power supply.

A high speed dynamic power supply current sensor

2007 ◽  
Author(s):  
J. Roberts ◽  
A. Eastridge ◽  
D. Binkley ◽  
Scott Thomas ◽  
Rafic Makki
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Current Sensor ◽  
Dynamic Power ◽  
Supply Current ◽  
Dynamic Power Supply Current

Design and Implementation of a Linear Testbed for Encoder Validation

1996 ◽  
Author(s):  
William Michael Pulanco ◽  
Stephen Derby
Keyword(s):  
Power Supply ◽  
Drive System ◽  
Control Panel ◽  
Belt Drive ◽  
Operating Speed ◽  
Linear Motion ◽  
Final Solution ◽  
Design And Implementation ◽  
Linear Slide ◽  
Total Test

Abstract It was desired to build a test station that would test the maximum operating speed and assist in the adjustment of the potentiometer during assembly of the linear encoders. A linear slide table provides the best linear motion to test encoders. It was also decided that a belt drive system would allow for the desired performance. The belt drive system is connected to a motor which needs some type of control. Many different options were considered for controlling the motor and some tried, but the final solution was to use a stand alone controller that would take input from a control panel. The total test station includes a motor & encoder, controller, amplifier, power supply, and interface board. The controller is a stand alone unit, that is programmed from the RS232 port on a personal computer. The controller can also send data back through the RS232 port for analysis purposes.

Ensuring electrical safety of power supply systems of electrified AC railways for highspeed lines

2018 ◽  
Vol 77 (6) ◽  
pp. 337-346 ◽  
Author(s):  
A. B. Kosarev ◽  
A. V. Barch ◽  
E. N. Rozenberg
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Structural Features ◽  
Electrical Safety ◽  
Safe Operation ◽  
Ballastless Track ◽  
Conventional Structure ◽  
Artificial Earth ◽  
Earth Connection ◽  
Supply Systems

Abstract. High-speed railways are fast-growing and promising type of traffic. In Russia development of high-speed railway service is associated with the solution of a number of problems, including infrastructure. Authors propose to use earth connection of the railway catenary with the help of an artificial earthing switch on currently designed high-speed line Moscow—Kazan for 2×25 kV power supply system. Taking into account requirements for electrical safety conditions for maintenance of the track and earthed catenary supports, paper justifies method for calculating allowable voltages of rail—earth points and supports of catenary. Methods takes into account structural features of ballastless track superstructure used for high-speed lines. It is estimated that the voltages admissible under the electrical safety conditions are random in nature and distributed logarithmically normal. When calculating probability of safe operation, one should take into account random nature of both permissible stresses and those actually occurring on the track. It is estimated that the probability of safe operation in traction networks of sections with ballastless track superstructure does not exceed a similar value in electrified sections with the conventional structure of a ballast prism. Feasibility of using a 2×25 kV earth system using an artificial earth connection is confirmed, recommendations on its use are given. Authors substantiate allowable values of the rail—earth voltage and catenary supports, which practically exclude the occurrence of hazardous situations for personnel maintaining the track in sections with ballastless track superstructure.

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