AC/DC Power Supply Bypass Control for Lower Conversion Loss

The patent implements dynamic operation mode switching where the power factor correction circuit can operate in either boost mode or bypass mode based on input conditions. The controller dynamically selects the appropriate mode: when DC input voltage is within a preset range, the circuit operates in boost mode to stabilize output voltage; when DC input voltage exceeds the preset range, the circuit switches to bypass mode to reduce power loss. This dynamic adaptation resolves the contradiction between maintaining voltage stability and reducing energy loss.

The patent segments the power factor correction circuit's operation into distinct functional modes (boost mode and bypass mode) that can be independently controlled. The circuit is divided into functional modules with clear boundaries: the power factor correction circuit, the bypass circuit, and the controller. This segmentation allows each module to operate independently in its optimal state, simplifying the overall control logic while maintaining voltage stability through coordinated operation of the segmented components.

The patent implements periodic detection and switching action where the controller continuously monitors the input voltage type and magnitude, then periodically switches between operational modes. The controller detects whether the input is AC or DC, and for DC input, whether the voltage is within or exceeds the preset range, then switches the power factor correction circuit between boost mode and bypass mode accordingly. This periodic detection and switching ensures power factor correction is applied only when necessary (AC input or DC within range), eliminating unnecessary power loss while maintaining reliability.