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Adjustable Circuit of NC Half-Bridge PWM Output With Precise Reference Frequency(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2011年02期
Page:
34-38
Research Field:
Publishing date:

Info

Title:
Adjustable Circuit of NC Half-Bridge PWM Output With Precise Reference Frequency
Author(s):
Luo Jun; Ruan Cheng; Xu Yinlin
School of Physical Science and Technology,Nanjing Normal University,Nanjing 210046,China
Keywords:
DSP; AD9833; digital controlled; half-bridge circuit
PACS:
TH777
DOI:
-
Abstract:
An adjustable circuit of NC half-bridge PWM output with precise reference frequency is described in this paper， which is used to make sure that the ultrasonic transducer can work on the resonant point precisely in power amplifier circuit． The precise reference frequency is generated by AD9833． In order to control the output power exactly，X9312 and 555 timer are combined to adjust the duty cycle of PWM，and one PWM signal is transformed into two complementary waves to drive power amplifier circuit of ultrasonic transducer．

References:

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［5］李莉，胡之惠． PWM 基带数字信号的产生与检测［J］． 上海师范大学学报: 自然科学版， 2002， 35( 3) : 31-36． Li Li，Hu Zhihui． The generation of PWM baseband digital signals and the demodulation［J］． Journal of Shanghai Normal University: Natural Science Edition，2002，35( 3) : 31-36． ( in Chinese)

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Last Update: 2013-03-21