How do we choose a power supply module in the power supply design, the premise of the choice is that we have to understand various power supplies and understand the difference between various power supplies so that we can correctly select the power supply module.
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 during the process of converting the voltage, so the efficiency of the transformer is very low, generally not exceeding 35%. Advantages of analog power supply: strong for application, the current and voltage continue to change during the cycle, the changes of voltage, current and frequency restrict each other. It can work under the condition of high voltage and large current.
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.
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 the magnetic field change also reaches tens of thousands of Hz, so 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. The switching power supply also have some disadvantages: There is a serious interference to the switch. Since it will produce some interference during the operation, if it is not controlled and eliminated in an orderly manner, it will have a certain impact on the normal operation of the entire equipment. In the absence of isolation operation, it will affect some nearby equipment. interfere with electrical appliances. Since there are still some flaws in our country’s technology in this area, the performance in terms of reliability is average, and it has not been widely used and popularized in the market. However, even in some countries with advanced technology, there are some problems in the practical application of switching power supply. The complicated circuit and complicated structure make it more likely to fail, and the maintenance is inconvenient.
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 high-power power amplifiers, switching power supply can be very fine and compact. The digital power amplifier of Utmel Electronics Co., Ltd. is the most advanced.
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 is managed, digital power has advantages. 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, digital power supplies are used in various applications through software programming, compared to analog power supplies, and their scalability and reusability allow users to easily change operating parameters and optimize the power supply system. It also reduces the number of peripheral components through real-time overcurrent protection and management.
Digital power supply: There are those controlled by DSP and those controlled by 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 advantages of digital power supply? 1. High integration. The digital circuit uses binary, only 0 and 1, and the requirements for components are not high, which is conducive to mass production. 2. Anti-interference and strong reliability. The digital signal has only 0 and 1, which improves the identification of the circuit and is not easily disturbed. 3. Simple and long-lasting storage. Digitization is easy to save in storage tools such as CD-ROM, which can be permanently stored. 4. Low cost and strong versatility. The digital circuit unit is simple, the component requirements are not strict, and there are many digital integrated circuit products in the market. 5. Strong confidentiality. Digital information is easy to encrypt, not easy to crack, and not easy to steal. 6. Strong flexibility. Not only can numerical operations, but also logical operations and judgments. 7. Strong intelligence. With monitoring and processing capabilities, it can ensure optimal power and conversion efficiency at various input voltages and load points.
If the A/D or D/A function of the chip is not used, the digital power supply and the analog power supply can not be distinguished. If A/D or D/A is used, also consider the reference power supply design
