What is the difference between analog power supply, switching power supply, and digital power supply?
How do we choose the power module in the power supply design, then the premise of the choice is that we have to understand various power supplies and understand the difference between the various power supplies, so that we can choose the power supply module correctly.
Analog power supply: the transformer power supply is realized by an iron core and a coil. The number of turns of the coil determines the voltage ratio at both ends. The function 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. 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 conversion.
Disadvantages of the analog power supply: the coil and the iron core are conductors, so they will generate heat (loss) due to the self-inducted current during the conversion of voltage, so the efficiency of the transformer is very low, generally not exceeding 35%. The application of transformers in audio equipment amplifiers: high-power amplifiers require transformers to provide more power output. Then, only by increasing the number of coil turns and increasing the core volume, the increase in turns and core volume will increase Because of its loss, the transformer of the high-power amplifier must be very large, which will lead to: bulky and heat-generating.
Switching power supply: Before the current enters the transformer, through the switching function of the transistor, we usually raise the current frequency of 50HZ to tens of thousands of HZ. At such a high frequency, the frequency of the magnetic field change also reaches tens of thousands of HZ, then the coil can be reduced The same voltage conversion ratio is obtained for the number of turns and the volume of the core. Due to the reduction in the number of turns and the volume of the core, the loss is greatly reduced. The efficiency of the general switching power supply reaches 90%, and the volume can be made very small, and the output is stable, so the switch The power supply has the advantage that the analog power supply is difficult to achieve.
Audio equipment-the application of switching power supplies in power amplifiers: The description of switching power supplies has shown the advantages of switching power supplies, so even high-power amplifiers, switching power supplies can be very delicate and compact. At present, the domestic digital power amplifier is Shenzhen Tripa The digital power amplifiers of Sri Lankan Digital Audio Equipment Company are the most advanced. They have now developed into a class T pure digital power amplifier, and the next-generation class S power amplifier is also under development. For details, please refer to the following information:
In applications that are easy to use and require few parameter changes, analog power products have more advantages, because the targeted application can be achieved by hardware curing, and there are more controllable factors, faster real-time response, and more needs. In an analog system power management, complex high-performance system applications, digital power has advantages. In addition, in the complex multi-system business, digital power is implemented through software programming in comparison to analog power. Its scalability and reusability allow users to easily change working parameters and optimize the power system. Through real-time overcurrent protection and management, it can also reduce the number of peripheral devices.
In a complex multi-system business, digital power is implemented through software programming in comparison to analog power. Its scalability and reusability allow users to easily change operating parameters and optimize the power system. Through real-time overcurrent protection and management, it can also reduce the number of peripheral devices.
The digital power supply can be controlled by DSP or MCU. Relatively speaking, the DSP-controlled power supply uses digital filtering, which can meet the complex power supply requirements, the real-time response speed is faster, and the power supply voltage regulation performance is better. What are the benefits of digital power supply? It is first programmable, such as communication, detection, telemetry and all other functions can be achieved by software programming. In addition, the digital power supply has high performance and high reliability, and is very flexible.
Interference: Between digital and analog in the single-chip microcomputer, because the digital signal is a pulse signal with a very wide spectrum, it is mainly because the digital part has a strong interference with the analog part; not only are digital power and analog power separated, but also used between the two Filter connection, in some occasions with higher requirements, such as the AD converter inside some single-chip microcomputers, the digital part often enters the sleep state, most 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 separated by inductance and capacitance. You can also connect the power supply of the digital and analog parts of the whole board separately, and directly connect to the power supply filter capacitor with separate channels Solder joints. If the anti-interference requirements are not high, they can also be connected together.
If you do not use the A / D or D / A function of the chip, you can distinguish between digital power and analog power. If you use A / D or D / A, you also need to consider the reference power supply design.
If you want to know more, our website has product specifications for power supply, you can go to ALLICDATA ELECTRONICS LIMITED to get more information