Although linear power supplies are very suitable for powering low-power devices, such as cordless phones, game consoles such as PlayStation/Wii/Xbox, etc., for high-power devices, linear power supplies will not be enough.
For a linear power supply, the internal capacitance and the size of the transformer are inversely proportional to the frequency of the AC mains: that is, if the input mains frequency is lower, the linear power supply requires larger capacitors and transformers, and vice versa. Since the AC mains power with a frequency of 60Hz (50Hz in some countries) is currently used, which is a relatively low frequency, the transformers and capacitors are often relatively large. In addition, the larger the surge of the AC mains, the larger the transformer of the linear power supply.