Several technical issues in the design and implementation of digital power supplies have also been the subject of discussion among engineers and experts in the industry. This article will be discussed in several ways: First, what is the most essential difference between digital power supply and analog power supply? The essence of the so-called digital power supply is that the PWM regulation of the output current/voltage of the power supply is generated by the digital chip according to a certain digital control method and algorithm, which is the most essential feature of the digital power supply. Those who have expanded the 8-bit, 16-bit microcontroller to provide digital input and output operation interface, remote communication interface, but the PWM adjustment of the power supply still depends on the power supply of the analog power modulation chip. It can only be said that they have a digital power supply face, but there is no digital power supply. "core". Second, what are the technical bottlenecks in digital power supply implementation? At present, digital power supply still has high-speed/high-precision ADC technology problems (digital power feedback input); high-speed/high-precision power supply PID adjustment or other algorithm PWM adjustment; high-speed/high-precision PWM output problem (digital power DAC output). Many 32-bit DSP/ARM high-speed 10-bit, 12-bit ADCs can be used as high-speed ADC for high-frequency switching power supply, but their signal input range is generally 0~3.0/3.3V, the typical analog input range of industrial sites. Positive or negative 10V but no DSP or ARM on-chip ADC can solve, only add signal conditioning circuit on the outer end. ADI and a few well-known analog device manufacturers in the product catalog, although fully compatible with high speed, high precision (16bit ~18bit), input signal range is positive and negative 5V to plus or minus 10V ADC products, but in mainland China, there are very few successful product application records, and the problems are probably only clear to the engineers who are debugging these devices. High-precision power supply PID adjustment or PWM adjustment of other algorithms is not a problem in the current popular 32-bit DSP or ARM processor, but if you want to add high-speed two words, many software engineers may have to frown. Take TI's motion control TMS320F2812 as an example. If the switching frequency of the power supply device reaches 300KHz, the task left to the software engineer at 150MHz system frequency is to complete the ADC input data processing and power PID in 500 DSP instruction cycles. Real-time requirements such as function adjustments are the most demanding tasks. If you want to avoid the harmonics caused by the power electronics during the cycle turn-on/turn-off, the ADC samples at the middle of the device turn-on, then the counter uses the UP-DOWN mode to count the ADC samples simultaneously at the count period value. This time the software Engineers can use the DSP instruction cycle to leave only a poor 250, power PWM adjustment task is quite arduous! If the ADC problem can be solved by expanding the high-speed, high-precision device, the power supply PWM adjustment can be completed with a higher speed DSP/ARM/FPGA. Then the last high-speed/high-precision PWM output problem, that is, the high-speed digital PWM resolution. The rate problem can only be solved by the international big manufacturers that provide DSP/ARM/FPGA. In fact, the resolution of digital PWM is not a problem in the low-frequency range of the switching power supply (this is also an important reason why TI's C28XDSP can be popular in the fields of motor drive, inverter, etc.); but to the high-frequency switching power supply, or the high-precision power supply field. This problem immediately became very prominent. Why is the high-frequency, high-precision digital switching power supply still a blank in China? It is very clear that everyone will use the calculation formula of digital PWM resolution. 3. What are the benefits of digitalization? Why do you want to digitize? Is there any place that simulation methods can't do? Many people say that my power requirements are very low, and I don't need it to have such high indicators and features - this less demanding application is still a restricted area for digital power. Then digital power can't be digitalized and digitized. The existing demand market is some areas where analog power is difficult to implement. For example, high-power high-voltage inverters using SVPWM algorithm. The space vector algorithm has been in existence for more than ten years since its introduction. Compared with the SPWM algorithm (which can be implemented by analog schemes, many domestic companies also use DSP), there are many domestic literature and technical reports. This is the existence of digital technology. The place. The domestic mature products in this area are basically not available, and the market has been monopolized by large foreign companies such as Siemens and ABB. What are the advantages of digital power versus analog power? I think the flexibility of the digital device itself. The internal parameters of the power supply controlled by the digital device can be adjusted online, which means that the dynamic characteristics of the power supply are variable, and the load can be varied within a relatively large range while maintaining a certain performance. The communication advantages of digital power supply enable the power supply equipment to have a variety of remote control methods, which will bring many benefits to the operation and monitoring of the equipment. Another point that personally thinks should be the most deadly threat to digital power from analog power: digital technology is growing too fast, and it's a bit overwhelming. A few years ago, the single-chip microcomputer was a single-chip microcomputer, and the DSP was a DSP. The boundary seemed to be quite clear. Now the 32-bit ARM is good, and the DSP is good. It is an improved Harvard structure. The difference in architecture is increasingly blurred and the performance is getting stronger. The price is getting lower and lower. A few years later, when high-performance digital devices with high-speed, high-precision ADCs, DACs, and PWM outputs below 1$ are placed in front of you, will you stay in the simulation solution? Fourth, the price problem Cost control, the cost of power equipment is always the principle that designers must follow. Digital power has appeared more than a decade ago, but because of its high price, it has been limited to some special high-end applications. Thanks to the rapid advancement of electronic technology over the years, the performance of digital control chips has continued to leap, but the price has continued to fall, and digital power sources have begun to slowly penetrate into the application fields of traditional analog power supplies, and the development is getting faster and faster. Some friends said that the price of digital chips exceeds 40, I will not consider it, and some friends have higher price thresholds, and more than 20 are not considered. However, there are two ways to reduce the price reduction of digital devices. One is the traditional way, that is, the price of one type of device is slowly decreasing, and the other is that the production company introduces a new and cheap alternative. This second type of disguised price reduction method is considered to be unique to digital devices, and the action is particularly large. The price of new products can be reduced to a fraction of the price of the old products of the same core. As a designer, it is recommended to maintain a considerable degree of technical attention to digital devices. When do you start to evaluate the performance of a device, when to consider a solution as a technical reserve, and when to consider a solution as a formal product production solution. . . . . . 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