一种直流母线电压调制电容放电的PWM逆变器

Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting Pub Date : 1988-10-02 DOI:10.1109/IAS.1988.25150

Wong Dafeng

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引用次数: 0

摘要

提出并分析了一种采用直流母线电压调制电容放电的脉宽调制逆变器。直流母线电压周期性调制为零，可使电源开关的开关频率提高约一个数量级。逆变器非常适合于完全控制的功率开关。讨论了一种特别适用于该逆变电路的变频三相感应电动机的pwm控制方案。该方案采用线性自适应增量调制产生PWM序列。采用增量调制可以很容易地从PWM脉冲序列平滑地转换为方波序列。微机软件可实时生成PWM序列

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A PWM inverter with DC busbar voltage modulation of capacitor discharge

A PWM (pulsewidth-modulated) inverter with DC busbar voltage modulation of the capacitor discharge is presented and analyzed. DC busbar voltage is periodically modulated to zero, which can arise the switching frequency of the power switches by about one order of magnitude. The inverter is well suited for fully controlled power switches. A PWM-controlled scheme for a variable-frequency three-phase induction-motor drive especially suitable for this inverter circuit is discussed. The scheme adopts linear adaptive delta modulation to produce the PWM sequence. With delta modulation it is easy to change from a PWM pulse sequence to a square sequence smoothly. Microcomputer software can be used to produce the PWM sequence in real time.<>

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Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting

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