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Hello. It's guu.
The other day, I studied the principle of booster circuits that use coils, and in doing so, a further question arose.
That is, "How high can the voltage be increased by using a booster circuit?"
Wouldn't it be great if you could increase the low input voltage as high as possible?
Therefore, this time, we focused on "what does it mean to increase the voltage?"
I would like to think about the "Limit of voltage boost".
Commentary
Consider increasing the voltage in the following example.
"By sucking up water (electricity) in a cup using a straw (circuit), the water level (voltage) rises."
In this case, how can the water level be made higher?
If the amount of water is constant, the smaller the amount of water sucked up by making the straw as thin as possible, the more
Water can be sucked up to high places.
That means...
How high can water be sucked up if the straw is infinitely long and thin?
In other words, there is no limit to boosting! ?
No. Unfortunately, boosting has its limits.
Considering this example, what would happen if you tried to make the straw very thin and long?
Doesn't the strength of the straw decrease by making it thinner and longer, and it snaps off?
So why not make straws out of more durable materials? You might think that, but all materials have their strength limits.
The strength limit of this material is the "absolute maximum rating" of the device!
(For absolute maximum ratings, see this article.)
No matter how high the voltage can be boosted, the device will be destroyed if the absolute maximum rating is exceeded, so it is useless.
In other words, it is not the booster circuit that sets the limit of boosting, but the devices supplied with voltage from the booster circuit.
Think in terms of actual circuits
In this example, "reducing the amount of water flowing by making the straw thinner" is
In the actual circuit, it corresponds to reducing the amount of electricity flowing at one time by speeding up the switching of the IC power supply.
Summary
Theoretically, there is no limit to boosting using a booster circuit.
However, if a voltage exceeding the absolute maximum rating is applied to a device that is supplied with voltage from a booster circuit, the device will fail.
Therefore, the absolute rating of the device actually determines the boost limit.
Guu's tweet
It's a bit sad that the device can't withstand even though there is no boost limit.
bonus
The voltage step-up method introduced this time used the switching of the power supply IC.
Apart from this, there is also a step-up method using a “transformer”.
A transformer has a structure with two iron cores with conductors wound around, and the ratio of the number of turns of the conductors of the two iron cores is the step-up ratio.
If you are interested, please check it out.