High-efficiency low-ripple frequency conversion modulation method
A variable frequency modulation, low ripple technology, applied in the field of electric drive, can solve the problems of shortening motor life, reducing system operation stability, safety reliability and electromagnetic compatibility, low switching frequency, etc., to improve system efficiency and, The effect of improving the electromagnetic compatibility characteristics and reducing the overall loss
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[0027] The present invention will be further described below in conjunction with the accompanying drawings.
[0028] A high-efficiency and low-ripple frequency conversion modulation method is used in the following motor drive system: the motor drive system consists of a vector control module, a modulation algorithm module and a hybrid inverter module, such as figure 1 shown. The vector control module is a double-closed-loop structure, which is used to output a given reference voltage, and the drive signal controls the switching tubes of the hybrid inverter module to turn on and off, and then controls the motor. The modulation algorithm module synthesizes a given reference voltage by adjusting the drive signal of the inverter. The hybrid inverter module includes a rear-stage low-frequency switch module and a front-stage high-frequency switch module. The subsequent low-frequency switch module includes first to sixth low-frequency switch devices, and the low-frequency switch de...
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