Voltage Ripple Cancellation in Buck Converter based on Hybrid Structured Connection

In applications where size and efficiency are critical switched mode power supply converters are used. A switched mode DC-DC buck converter or step-down converter use output filter capacitor to reduce output voltage ripple. To reduce size of buck converter, the elimination of the capacitor must be done. Instead of the capacitor the structure with additional linear amplifier is introduced for output voltage ripple reduction. The amplifier reduces ripple in output current and consequently ripple in output voltage. The structure operation is theoretically investigated and verified by simulations and experimental results.