TIDUET3 February   2021

 

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Select LM/LR Ratio (LN) and QE

LN is the ratio between the magnetizing inductance and the resonant inductance.

Equation 26.
GUID-20210112-CA0I-0DPC-7HLK-5MHDJVK6TZNB-low.gif

QE is the quality factor of the resonant tank.

Equation 27.
GUID-20210112-CA0I-6NCX-H3QW-C9SBL98L9JXL-low.gif

Selecting LN and QE values must result in an LLC gain curve, as shown in Figure 2-2, that intersects with

Mgmin and Mgmax traces. The peak gain of the resulting curve must be larger than Mgmax.


GUID-20210113-CA0I-HWVB-2TS4-226L8HBCFHF8-low.png

Figure 2-2 LLC Gain Curve for Selected LN and QE

The relationship between MGpeak and QE with respect to LN is shown in Figure 2-3:


GUID-20210113-CA0I-PJCK-VBDH-3C4SN0LCRJP4-low.png

Figure 2-3 MGpeak and QE With Respect to LN