High DC Voltage Boost Converter

The Boost Converter is a DC-to-DC SMPS (Switched Mode Power Supply) that increases voltage. It uses an inductor in series with a switching MOSFET. The output is rectified with a Peak Detector. (Asynchronous) The Peak Detector consists of a diode that can be replaced with a MOSFET for better efficiency. (Synchronous) Over time the Boost Converter evolved into the Flyback Converter which replaced the inductor with coupled inductors. This example shows the outcome of not having a load connected to the Boost Converter. The voltage will keep increasing towards "Infinity, which is 1000 Volts for our example. The Boost Converter is designed to have a load on it. A feedback loop can help determine if a load is connected or not. A feedback loop can also help to monitor the mode of operation. The 3 modes of operation for the Boost Converter are: 1. Continuous Conduction Mode (CCM) 2. Discontinuous Conduction Mode (DCM) 3. Critical Conduction Mode (BCM) -> sometimes referred to as Boundary Conduction Mode. One can determine the mode of operation by looking at the ripple current through the inductor. 1. Continuous Conduction Mode (CCM): The inductor will always have non-zero current 2. Discontinuous Conduction Mode (DCM): The inductor current drops to zero and stays at zero until the next cycle 3. Critical Conduction Mode (CCM): The inductor current switches ON as soon as the inductor current drops to zero We will look at the 3 different modes in another example. We will also look at the Flyback Converter in another example. -Tehrangeles⚡