Introduction to Analog Power
Analog power supply: that is, the power supply of the transformer, which is realized by the iron core and the coil. The number of turns of the coil determines the voltage ratio between the two ends. The role of the iron core is to transmit the changing magnetic field. This changing magnetic field is transmitted to the secondary coil through the iron core, and an induced voltage is generated in the secondary coil, so the transformer realizes the voltage transformation.
Disadvantages of analog power supply: The coil and the iron core are conductors themselves, so they will heat up (loss) due to self-inductive current in the process of converting the voltage, so the efficiency of the transformer is very low, generally not more than 35%.
The application of transformers in audio equipment power amplifiers: high-power power amplifiers require transformers to provide more power output. Then, only through the increase in the number of coil turns and the increase in the volume of the iron core, the increase in the number of turns and the volume of the iron core will increase Therefore, the transformer of the high-power amplifier must be made very large, which will lead to: Cumbersome and calorific.
Introduction of switching power supply
Switching power supply: Before the current enters the transformer, through the switching function of the transistor, the current frequency of our usual 50HZ is increased to tens of thousands of Hz. At such a high frequency, the frequency of magnetic field changes also reaches tens of thousands of Hz. Then, the coil can be reduced. The same voltage conversion ratio can be obtained by the number of turns and the volume of the iron core. Due to the reduction of the number of coil turns and the volume of the iron core, the loss is greatly reduced. Generally, the efficiency of the switching power supply reaches 90%, and the volume can be made very small, and the output is stable, so the switch Power supplies have advantages that are difficult to achieve with analog power supplies.
(Switching power supply also has its own shortcomings, such as output voltage ripple and switching noise, linear power supply does not have)
Audio equipment-application of switching power supply in power amplifier: The advantages of switching power supply have been shown in the description of switching power supply, so even for high-power amplifiers, switching power supply can be done very finely and compactly.
Introduction to digital power
In applications that are easy to use and require few parameter changes, analog power products are more advantageous, because the pertinence of their applications can be achieved through hardware curing, while in the case of many controllable factors, faster real-time response, and more needs. In complex high-performance system applications where analog system power management is required, digital power is more advantageous. In addition, in the complex multi-system business, compared with analog power supply, digital power supply realizes various applications through software programming. Its scalability and reusability allow users to easily change working parameters and optimize the power supply system. It also reduces the number of peripheral components through real-time overcurrent protection and management.
In the complex multi-system business, compared with analog power supply, digital power supply realizes various applications through software programming. Its scalability and reusability allow users to easily change working parameters and optimize the power supply system. It also reduces the number of peripheral components through real-time overcurrent protection and management.
The digital power supply can be controlled by DSP and MCU. Relatively speaking, the power supply controlled by DSP adopts digital filtering method, which can meet the complex power supply requirements better than the power supply controlled by MCU, with faster real-time response speed and better power supply voltage regulation performance.
What are the benefits of digital power
First of all, it is programmable. All functions such as communication, detection, telemetry, etc. can be realized by software programming. In addition, digital power supplies have high performance and reliability, and are very flexible.
Interference: Between digital and analog in the single-chip microcomputer, because the digital signal is a pulse signal with a wide spectrum, the interference between the digital part and the analog part is mainly strong; not only is the digital power supply and the analog power supply separated, Filter connection, in some high-requirement occasions, such as when the AD converter inside some single-chip microcomputer performs AD conversion, the digital part is often put into a dormant state, and most of the digital logic stops working to prevent them from forming the analog part. interference. If the interference is serious, you can even use two power supplies separately, generally using inductors and capacitors to isolate them. You can also connect the power supplies of the digital and analog parts of the entire board together, and use separate paths to directly connect to the solder joints of the power supply filter capacitors. If the anti-interference requirements are not high, you can also connect them together.
