LLC converter with dynamic gain transformation for wide input and output range

摘要

A resonant power converter system includes an output load and a rectifier stage that provides a DC output voltage to the output load from an AC intermediate voltage. The resonant power converter system also includes a resonant inverter stage that provides the AC intermediate voltage from a DC input voltage, wherein an inverter gain is controlled by switching between full-bridge and half-bridge topologies based on an external variable of the resonant power converter system. The resonant power converter system further includes a controller that controls the resonant power converter system. Additionally, a method of operating a power converter includes rectifying an AC intermediate voltage to provide a DC output voltage and providing the AC intermediate voltage by inverting a DC input voltage, wherein an inversion gain of the AC intermediate voltage is controlled by switching between full-bridge and half-bridge inversion topologies based on an external variable.

主权项

1. A power converter, comprising:
a rectifier stage configured to provide a DC output voltage from an AC intermediate voltage; and a resonant inverter stage configured to provide the AC intermediate voltage from a DC input voltage, wherein an inverter gain is controlled by switching between full-bridge and half-bridge topologies based on an external variable of the power converter, wherein the resonant inverter stage comprises:
a switch network configured to provide a square AC waveform based on the DC input voltage; andan inductor, inductor, capacitor (LLC) resonant circuit coupled to an output of the switch network, the LLC resonant circuit configured to adjust a frequency of the square AC waveform relative to a resonant frequency of the LLC resonant circuit to control the DC output voltage, while maintaining a fixed duty cycle of the LLC resonant circuit.