| 摘要 |
A method for PWM frequency correlation of the present invention is disclosed. In that, 2xM PWM signals G1-Gn are supplied to control ends (gates) of the switch elements (such as MOSFET) Q1-Qn of the D. C. boost circuit, where M is a prime number larger than 1, and the PWM signals G1, G3, G5, . . . , Gn-1 are synchronous, and have a phase difference of 180 degrees/M, and the PWM signals G2, G4, G6, . . . , Gn are synchronous, and have a phase difference of 180 degrees/M. by this design, a ripple current and EMI interference to the battery as the PWM signal is switched are reduced.
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