How Boost Converters Work (DC-DC Step-Up) - Electronics Intermediate 1
Why Electrical Engineering Stack Exchange recommends it
Electronics Stack Exchange users link it when someone asks how a step-up converter works internally, as a visual companion to written answers.
Recommended by 1 people across 1 different months, 2018 to 2020.
What it is
A short animated explainer from the Simply Electronics channel showing how a DC-DC boost (step-up) converter works, using simulated circuits from Everycircuit to visualise current flow through the inductor, switch, diode and capacitor. It is part of the channel's Electronics Intermediate series.
What people said
Recommends Basj · 2019-09 · Electrical Engineering Stack Exchange · on “How does such an USB step-up 5V-12V work?”
As mentioned in a comment, here [this video] is an interesting video giving details about the internals of a step up converter. I bought this item, and here are more details: [LINK] Internal: [LINK] Apart from some resistors and capacitors, there are: a Schottky diode [LINK] SS24 a 3R3 [LINK] power inductor an unknown AL877 6-pin chip (?) I also bought this item ("MT3608 DC-DC Step Up Boost Converter Power Supply Module 2V-24V to 5V-28V 2A"): [LINK] I tried to power it with: 1 AA battery (1,35V) : non working, the output stayed always at 1.21V 2 AA battery (2.7V) : working great, the output can go up to 27.4V ! 3 AA battery (4V) : working as well During my test, there was a cool feature (I don't
Cites Jack · 2018-02 · Electrical Engineering Stack Exchange · on “Boost converter, how does diode allow current from inductor to flow towards capacitor?”
So I watched this [this video] video to understand how DC-DC boost converter works. Here's circuit diagram: [LINK] And I don't get, when switch is off, and polarity in the inductor is such that positive is on the right, negative is on the left. [LINK] Then in order for diode to conduct, anode should be at higher potential than cathode. In other words, voltage across inductor needs to be higher than voltage across capacitor. Now video said, there's gonna be a spike in voltage in the inductor after switch is off due to collapsing magnetic field to keep current constant, but how big is this spike? And wouldn't charge, and therefore voltage across capacitor be so big, that the spike in inductor will
Cites AirCraft Lover · 2020-01 · Electrical Engineering Stack Exchange · on “How can I use USB output (5V DC) to power a fan 12V DC load?”
Thanks you for your nice explanation. I got here [this video] good demonstration of boost converter. Seems that it is part of SMPS, also applied in current phone charging.