Improvement on Zero Nonlinear Compensation of Time Division Multiplier

2014 ◽  
Vol 687-691 ◽  
pp. 3132-3136
Author(s):  
Wu Zhu ◽  
Juan Juan Yu
Keyword(s):  
Compensation Effect ◽  
Frequency Conversion ◽  
Zero Point ◽  
Power Measurement ◽  
Test Results ◽  
Conversion Method ◽  
Voltage Frequency ◽  
Nonlinear Compensation ◽  
Voltage Feedback ◽  
Time Division

In order to overcome the power measurement error caused by switch leakage of time division multiplier, in this paper, the mechanism of switch leakage of no-beats time division multiplier was analyzed, and switch leak was tested. On the basis of this, power compensation circuit on zero point correction based on voltage feedback and voltage frequency conversion method is designed, subsequently the compensation effect was tested respectively. Test results show that the zero compensation method based on voltage frequency conversion method is better, the zero error decreased to 0.0022%, the accuracy of the power measurement was improved.

Study on the "Phase Hopping" AC-AC Frequency Conversion Method with Approximately Continuous Frequencies

2020 ◽  
Vol 13 (8) ◽  
pp. 1217-1226
Author(s):  
Zhengwang Xu ◽  
Guozhuang Jiang ◽  
Ke Kun ◽  
Yuchun Yi
Keyword(s):  
Output Voltage ◽  
Frequency Conversion ◽  
Frequency Control ◽  
Actual Application ◽  
Power Frequency ◽  
Voltage Frequency ◽  
The Law ◽  
Large Cycle ◽  
Selection Of ◽  
Conversion Technology

Background: The output voltage frequency for the previously proposed "phase hopping" AC-AC frequency conversion technology is determined by the law that the number of output voltage cycles is reduced by one relative to the power frequency in a large cycle containing six jumps. According to the law, only a limited number of output frequencies, such as 37.5 Hz, 42.86 Hz and 45 Hz are found. Due to the large spacing between the output frequencies, the "phase hopping" frequency conversion technology is difficult to put into practical use. Methods: In this paper, the law of the output frequency control is generalized so that the number of output cycles in a large cycle is reduced by n relative to the power frequency. The analysis shows that the appropriate selection of large cycles, including the number of power frequency cycles and the value of n, can find more frequencies to be used. Reducing the interval between the output frequencies within 1Hz. Results: The analysis results were verified in simulation by MATLAB, and the harmonics and the feasibility of the actual application were analyzed. Conclusion: Finally, an experimental platform was built and an experimental analysis was carried out. The experimental results show that the theoretical and simulation analyses are correct.

Zero Error Analysis and Compensation of No-Beat Time Division Multiplier

2011 ◽  
Vol 130-134 ◽  
pp. 3293-3297
Author(s):  
Wu Zhu ◽  
Shui Xiu Guan
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Zero Point ◽  
Calibration Method ◽  
Offset Voltage ◽  
Ac Power ◽  
Time Division ◽  
The Mathematical Model ◽  
Poor Stability ◽  
Industrial Frequency

Time division multiplier was widely used in high-precision industrial frequency AC power measurements.The poor stability of zero point was caused by the switch leakage and amplifier offset voltage. Based on the experimental study of the time division multiplier circuit designed in the article, the mathematical model of zero point compensation was established, and then the appropriate calibration method was proposed. Considered the amplifier offset voltage, the error model of the time division multiplier was analyzed and the error expression was obtained. These can provide theoretical guidance for choosing amplifiers of the no-beat time division multiplier.

scholarly journals Optimal Multi-TDMA Scheduling in Ring Topology Networks

2015 ◽  
Vol 2015 ◽  
pp. 1-14
Author(s):  
Gergely Vakulya ◽  
Zsolt Tuza ◽  
Gyula Simon
Keyword(s):  
Multiple Access ◽  
Scheduling Algorithm ◽  
Optimal Schedule ◽  
Turnaround Time ◽  
Time Division Multiple Access ◽  
Test Results ◽  
Simultaneous Operation ◽  
Ring Topology ◽  
Practical Test ◽  
Time Division

A scheduling algorithm will be proposed for wireless ring topology networks, utilizing time division multiple access (TDMA) with possible simultaneous operation of nodes. The proposed algorithm finds the optimal schedule to minimize the turnaround time for messages in the network. The properties of the algorithm are mathematically analyzed and proven, and practical test results are also provided.

Research about Dielectric Loss Detector Based on Frequency Conversion Method

2013 ◽  
Vol 380-384 ◽  
pp. 3179-3183
Author(s):  
Guo Hua Hua ◽  
Zhong Ru Shen
Keyword(s):  
Dielectric Loss ◽  
Harmonic Analysis ◽  
Loss Factor ◽  
Frequency Conversion ◽  
Dielectric Loss Factor ◽  
Loss Measurement ◽  
Conversion Method ◽  
Equivalent Capacitance

This paper adopts frequency conversion method to avoid same frequency interfered, and deduces the dielectric loss factor and the equivalent capacitance using the harmonic analysis. Based on this theory, a DSP+FPGA detecting platform was built. At last, utilizing capacitance and resistance to simulate as dielectric loss measurement sample, the experiment was conducted.

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