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24 V half-bridge LLC doubler

Explore resonant startup, isolated output, and zero-voltage switching in a 24 V LLC converter.

Power

Use Transient to inspect output startup and primary resonance. Open ZVS switching detail to compare each switch’s drain-source voltage with its gate voltage.

Editor showing the 24 V half-bridge LLC doubler SPICE example as an unsaved schematic.
24 V half-bridge LLC doubler opens as an editable, unsaved schematic.

Open and run

  1. Open Examples from the Home ribbon.
  2. Choose 24 V half-bridge LLC doubler.
  3. Open Simulate and choose Setup to review the analyses.
  4. Choose Run for one analysis or Run All for the complete configured set.
  5. Select a matching Scope view after the run. Use Save as sheet to keep the example or Discard to close it.

Sheets, analyses, and Scope

Half-bridge LLC power stage

#

Setup: Transient primary-bus ramp startup

AnalysisConfiguration
Transient
  • Step 20n
  • Stop 1.2m
  • Initial conditions Enabled

Scope views and expected results

LLC output and primary resonance

Analysis: Transient

Output voltage
  • V(voutp)
  • V(voutn)
  • VoutV(voutp) - V(voutn)
Primary tank resonance
  • Primary voltageV(pri)
  • L1: CurrentCurrentI(L1)
Readouts
  • Differential output swingPk-PkV(voutp) - V(voutn)
  • Resonant RMS currentRMSI(L1)
ZVS switching detail

Analysis: Transient

High-side ZVS: VDS near 0 V before VGS rises
  • High-side VDSV(vin) - V(sw)
  • High-side VGSV(gh) - V(sw)
Low-side ZVS: VDS near 0 V before VGS rises
  • Low-side VDSV(sw)
  • Low-side VGSV(gl)

Python scripts

No Python scripts are included with this example.

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