Abstract

Spread spectrum technology can effectively reduce the peak value of electromagnetic interference(EMI), but it will bring more serious ripple problem to class E resonant converter. Based on spread spectrum modulation technology, this paper proposes a symmetrical chaotic spread spectrum method, which takes the traditional chaotic number as a symmetrical arrangement, so that the working frequency of the circuit changes with the symmetrical chaotic number, so as to achieve the effect of spread spectrum modulation, In this way, without changing the EMI suppression effect of the circuit, the voltage change of the circuit shows a central symmetrical trend, which reduces the ripple of the circuit to a certain extent, and the EMI of the circuit is also reduced due to the addition of spread spectrum signal.

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