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A Frequency Synchronization Method for a Self-Oscillating PWM Signal Generator

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5 Author(s)
Weibo Li ; Dept. of Inf. Process., Tokyo Inst. of Technol., Yokohama, Japan ; Niimi, Y. ; Orino, Y. ; Hirata, S.
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This brief proposes a frequency synchronization method for a full-digital self-oscillating pulsewidth modulation (PWM) signal generator. The self-oscillating PWM signal generator (PSG) generates a variable switching frequency, which results in poor drive performance for a three-phase power inverter or converter. The proposed frequency synchronization method utilizes an additional carrier signal, such as a triangular wave, to fix the switching frequency of a self-oscillating PSG. The switching frequency is synchronized by the triangular wave. As a test case, a switching frequency of 312.5 kHz is used for a performance evaluation of the proposed PSG with a sampling frequency of 12.5 MHz. A first-order noise-shaped output has been obtained. A high-precision PWM signal with low distortion and high resolution of the effective duty cycle has been achieved within the bandwidth. The proposed synchronized self-oscillating PSG is implemented in a three-phase brushless dc motor driver system to confirm the three-phase synchronization performance. Undesirable ripple current from asynchronous operation was not observed. The switching frequencies were synchronized among the three phases.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:61 ,  Issue: 4 )

Date of Publication:

April 2014

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