发明名称 |
Method and apparatus for controlling PWM inverter |
摘要 |
An induction motor is driven by a PWM inverter including switching elements such as gate turn-off thyristors of Graetz connection. Turn-on of the PWM inverter is controlled by PWM pulse signals generated from a pulse width modulator. The pulse width modulator includes comparators having a hysteresis characteristic which generate the PWM pulse signals on the basis of the magnitude and polarity of current errors between current command pattern signals and signals indicative of detected output currents of the PWM inverter. A signal generator generates an AC signal which is applied to the comparators so that the PWM pulse signals generated from the comparators act to increase the effective value of the neutral voltage of the output of the PWM inverter.
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申请公布号 |
US4629959(A) |
申请公布日期 |
1986.12.16 |
申请号 |
US19850766686 |
申请日期 |
1985.08.19 |
申请人 |
HITACHI, LTD. |
发明人 |
OKUYAMA, TOSHIAKI;NAGASE, HIROSHI |
分类号 |
H02P27/08;H02M7/48;H02M7/527;H02M7/5395;(IPC1-7):H02P7/42 |
主分类号 |
H02P27/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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