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Design of CLLC Converter with High Power and Wide Gain Range

Year: 2023 | Author: Chunyang Zhao | Paper: T1.5
Topology and wavefroms
Fig. 1. Circuit topology and waveforms of three-mode operations.
  In CLLC converters with regulation requirements, there are generally two constraints in the design procedure: First is to select an appropriate magnetizing inductance Lm and deadtime td (according to selected power switches) in order to realize zero-voltage switching (ZVS) at DC-DC Transformer (DCX) operation (fs ≈ fo) while achieving a minimum device loss (or close to the minimum). The second constraint is to satisfy the gain requirement within a practical switching frequency range.

  However, in high-power wide-gain-range applications, there is hardly a solution that meets both constraints.
Characteristic curves and waveforms
Fig. 2. 3D gain curves and operating path.


  Thus, several control methods are combined to solve the problem. In general, the converter will operate in DCX mode when the input voltage is in the nominal voltage range to maximize the peak efficiency, and will operate in boost mode when the input voltage is lower than nominal values to boost gain, and will operate in pulse-width modulation (PWM) mode when the input voltage is higher than nominal values to reduce switching frequency and device losses.

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