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Driving signal modulation method for suppressing electromagnetic interference of electric vehicle power module

A driving signal and power module technology, applied in the direction of output power conversion devices, electrical components, vehicle components, etc., can solve problems such as difficult suppression algorithms, random instability of current ripple, design, etc.

Active Publication Date: 2020-12-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the randomness and instability of the current ripple in the RPWM method, it is difficult to directly design the suppression algorithm, while the general VSFPWM method can only reduce EMI under the required conditions, and there are still many ripple signals in the current

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  • Driving signal modulation method for suppressing electromagnetic interference of electric vehicle power module
  • Driving signal modulation method for suppressing electromagnetic interference of electric vehicle power module
  • Driving signal modulation method for suppressing electromagnetic interference of electric vehicle power module

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Embodiment Construction

[0023] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0024] Such as figure 1 , 2 As shown, the process of the driving signal generation method in the present invention is divided into the following steps.

[0025] The driving signal of the inverter is a rectangular wave signal. In a single cycle, the driving signal is obtained by comparing the signal modulation wave with the carrier, that is, the duration of the seven-segment segmented switching sequence, and from this the three-phase bridge arm can be calculated. duty cycle.

[0026] In a single switching cycle, the duty cycle of the three-phase bridge arm d i (i=a,b,c) ...

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Abstract

The invention discloses a driving signal modulation method for suppressing electromagnetic interference of an electric vehicle power module. The method reduces motor current harmonics and peaks and ensures the stability of a system. The method mainly comprises the following steps: 1) determining pulse width voltage and sequence time in a single period; 2) calculating ripple current in the period;3) calculating the optimal value of a cost function; 4) calculating the carrier frequency when the optimal value of the function is taken; and 5) generating a driving signal of a new period. The problem that EMI generated by high-speed switching of the inverter module is difficult to suppress can be effectively solved, current spikes are reduced fundamentally, and generation of EMI of the electricvehicle is suppressed to a great extent.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic compatibility of motor systems, and more specifically relates to a driving signal modulation method for suppressing electromagnetic interference (EMI) of an electric vehicle power module. Background technique [0002] With the development of power electronics technology and motor control technology, electric vehicles have developed rapidly due to their high energy efficiency and environmental friendliness. A large number of electronic devices are used in electric vehicles, which already account for thirty percent of the cost of electric vehicles. [0003] Electromagnetic interference commonly exists in electronic equipment, which will increase system instability and system loss, and greatly threaten the safety of electric vehicles. Therefore, more and more attention has been paid to the research on the electromagnetic compatibility of electric vehicles, and the important source of electro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H02M1/08H02M1/084B60R16/02
CPCH02M1/44H02M1/08H02M1/084B60R16/02H02M1/0038
Inventor 陈勇潘尧杰陈章勇李猛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA