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 which can be replaced with a mosfet to achieve better efficiency. (Synchronous)
Overtime 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 a 1000 Volts for our example.
This is why 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): Inductor will always have non-zero current
2. Discontinuous Conduction Mode (DCM): Inductor current drops to zero and stays at zero until the next cycle
3. Critical Conduction Mode (CCM): 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.
Best,
Tehrangeles ⚡
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