The difference between switching power supply and analog power supply
Analog power supply: transformer power supply is realized by iron core and coil. The number of turns of the coil determines the voltage ratio at both ends. The role of the iron core is to transmit a changing magnetic field. (China) The main coil generates a changing magnetic field at a frequency of 50HZ, which is transmitted to the auxiliary coil through the iron core, and an induced voltage is generated in the auxiliary coil, so the transformer realizes voltage conversion.
Disadvantages of analog power supply: the coil and iron core are conductors themselves, so they will generate heat (loss) due to self-induced current in the process of voltage conversion, so the efficiency of transformer is very low, generally not exceeding 35%.
The difference between switching power supply and analog power supply
Application of transformer in audio equipment power amplifier: High-power power amplifier needs transformer to provide more power output, so it can only be realized by increasing the number of turns of coil and the volume of iron core, which will aggravate its loss. Therefore, the transformer of high-power power amplifier must be made very large, which will lead to: heavy and large heat.
Switching power supply: Before the current enters the transformer, the current frequency of 50HZ is raised to tens of thousands of HZ through the switching function of the transistor. At such a high frequency, the frequency of magnetic field change also reaches tens of thousands of HZ. Then, the same voltage conversion ratio can be obtained by reducing the number of coil turns and the volume of iron core. Due to the reduction of the number of coil turns and the volume of iron core, the loss is greatly reduced. Generally, the efficiency of switching power supply reaches 90%, but the volume can be made very small and the output is stable.
(Switching power supply also has its own shortcomings, such as ripple in output voltage and switching noise, which linear power supply does not have)
Digital power supply
Analog power supply products have advantages in applications that are simple and easy to use and require few parameter changes, because the pertinence of their applications can be achieved through hardware solidification, while digital power supply has advantages in complex high-performance system applications with more controllable factors, faster real-time response and the need for power management of multiple analog systems. In addition, in complex multi-system business, compared with analog power supply, digital power supply is applied in many aspects through software programming, and its expansibility and reusability enable users to easily change working parameters and optimize power supply system. Through real-time overcurrent protection and management, it can also reduce the number of peripheral devices.
The difference between switching power supply and analog power supply
In complex multi-system business, compared with analog power supply, digital power supply is applied in many aspects through software programming. Its expansibility and reusability make it easy for users to change working parameters and optimize power supply system. Through real-time overcurrent protection and management, it can also reduce the number of peripheral devices.
Digital power supply is controlled by DSP and MCU. Relatively speaking, the power supply controlled by DSP adopts digital filtering mode, which can meet the complex power demand, have faster real-time response and better power supply voltage stability than the power supply controlled by MCU.
What are the advantages of digital power supply? First of all, it is programmable. For example, all functions such as communication, detection and telemetry can be realized by software programming. In addition, the digital power supply has high performance, high reliability and is very flexible.
