Simply put, a switching power supply regulates voltage by regulating the switching frequency, but a linear power supply regulates voltage by adjusting the resistance value, which is comparable to changing the voltage by adjusting the sliding rheostat. The cost of the switching power supply rises together with the increase in output power, but at a different rate from the linear power supply than it does.
1. At a specific output power point, linear power supplies are more expensive than switching power supplies.
Therefore, switching power supply technology has consistently made advances and innovations along with the development and innovation of power electronics technology. Instead, this cost concern has shifted the switching power supply technology to the low output power end, giving the switching power supply a wide range of research area.
2. Electronic equipment is inextricably linked to a dependable power source because of the growing closeness between it and people's work and daily lives. The computer completely embraced the switching power supply once we entered the 1980s. The switching power supply made its way into the world of electrical and electronic appliances in the 1990s.
Switching power supply technology has quickly taken up the central role in power electronic devices in under ten years. Is this solely a result of switching power supplies' diminutive size?
3. In actuality, it is clear from the switching power supply's schematic diagram that it does not utilize a large power frequency transformer, and it also does without a larger heat sink because the amount of power that is dissipated on the adjustment tube is significantly decreased. The switching power supply is reduced in size and weight as a result. The primary benefit of switching power supplies is their high efficiency and low power consumption. The transistor in the switching power supply circuit repeatedly switches between the "on" and "off" states while being excited by the excitation signal. Because of the transistor's incredibly quick conversion speed and low frequency of only 50 Hz, the power efficiency is significantly increased.
4. A wide range of voltage regulation is available with the switching power supply. The duty cycle of the excitation signal controls the switching power supply's output voltage, and frequency or width modulation can be used to make up for changes in the input signal voltage. In this manner, it is still possible to provide a comparatively consistent output voltage even when the power frequency grid voltage varies significantly.
5. The operating frequency of the switching power supply is now 50 kHz, which is 1000 times greater than the linear regulated power supply. As a result, the filtering efficiency after rectification is 500 times better than that of the linear regulated power supply. When a switching power supply is utilized, the filter capacitor's capacity is only 1/500 to 1/1000 of what it would be in a linear regulated power supply with the same ripple output voltage.
