The time varying flux creates a time-varying current in the secondary coil and consequently, a time-varying voltage on the secondary coil.
In an ideal situation where no power loss occurs, the power input to the primary side is equal to the output power at the secondary. In power transmission, generated voltage at power plant should be stepped up to make the transmission current low, thereby making power loss low. At substations and distribution stations, voltage is stepped down to the distribution level.
Step-up transformers and step-down transformers are used to raise and lower the primary side voltage into the secondary, respectively. However, DC to AC converters are usually called as inverters. Nevertheless, all these converters and inverters are not single-component units like transformers, but are electronic circuits. These are used as different power supply units. These are the most common type of voltage converters. These are used in power supply units of many appliances to convert AC mains voltage to DC voltage for the electronic circuitry.
These are mostly used in backup power generation from battery banks and solar photovoltaic systems. The DC voltage of the PV panels or batteries is inverted to AC voltage to supply the mains power system of the house or a commercial building.
This type of voltage converter is used as travel adapters ; they are also used in power supply units of appliances made for multi-countries. This type of voltage converters is used in vehicle power adapters to run mobile chargers and other electronic systems on the vehicle battery.
The topology used in these converters and inverters may be different from one to another. There, they may use transformers as well to convert high voltage to a lower one. For example, in a linear DC power supply, a transformer is used at the input to lower the AC mains to a desired level. But, there are transformer-less applications as well.
In transformer-less topology, DC voltage either from input or converted from AC is switched on and off to make a high-frequency pulsed —DC signal. The on-off time ratio defines the output DC voltage level. This can be considered as a step-down transformation. In addition, buck converters, boost converts and buck-boost converters are employed in converting this pulsating DC voltage into a desired higher or lower voltage.
On a buck converter the diode does not carry that much current so something like W buck converter could very well work just fine with async topology. Not so much with boost topology! You cannot change the current in an inductor instantaneously so when the high side devices opens, the same current that was flowing through the high side flows through the low side.
See current's Ia and Ib in the diagram on Figure 2 of this webpage: analog. Could use some diagrams to make it clear to OP. Technically though it's not "high power" that leads to higher losses for asynchronous design, it's having to handle high current. On a low step down ratio your mosfet is going to carry most of the grunt work. As I said it depends on your application. On a high power boost topology the rectifying diode is your biggest headache power dissipation-wise.
You may be perfectly fine with 20A peak current but your part will die in fire with much less average current unless you have vigorous cooling solution in place. Verbal Kint Verbal Kint As it stands it is almost a wall of text with no images or links to relevant sources.
At least break the text into more paragraphs to aid readability, and thus aiding whoever will read it to scan quickly for relevant information. Thank you for pointing this out.
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