In fact, each method has its own advantages and disadvantages. But designers must ultimately choose whether to use analog solutions or digital solutions, and to make informed decisions requires an understanding of the pros and cons of each.
Analog switching power supplies have been in use for decades. It is well known and has many excellent textbooks, simulation kits, application notes and seminars. There are also a large number of low-cost integrated circuits from a wide range of vendors that package many functions, from integrated gate drivers and switches to current sensing and protection. In short, anyway, digital power will make the analog power supply redundant view too far-fetched.
Digital control has features that the analog world does not have, which makes switching power supply designs have features that have not been possible to date. As with other aspects of the project, these benefits come at a price, and the choice of using a digital solution must be based on whether these advantages outweigh the problems it brings.
One frequently mentioned digital control advantage is that it allows removal of some passive components in the controller, thereby eliminating component tolerance and aging issues. In addition, in some applications this advantage has greater value and far-reaching significance. For example, in some multi-loop designs, digital processors can be used to centralize control functions into a single device, enabling functions such as power rail sequencing, margining, load sharing, phase compensation, and software implementation fault prediction.
Modular power supply designers have more advantages. Think of a power supply manufacturer with many different power levels. A digital control solution allows a single processor to work with separate custom software to meet the needs of each power stage. In large-scale production, the scale of the economy produced will be enormous.
There are of course some issues that must be considered before using digital power. The PCB board space of the digital controller must include the MCU, crystal clock, protection/filtering, and ADC pin buffering. In addition, there are some limitations on PWM accuracy and ADC dynamic range. Still, some of the latest digital power-only MCU products can solve these problems.
Another issue that analog engineers are worried about is the time and effort required to master these digital design techniques. In many cases, concepts such as Z-conversion and sampling theory have not been touched since the day of graduation! Fortunately, many online tools are now available for free, automatically converting an analog design to discrete time equivalents based on a set of user frequency domain specifications. Biricha also offers a multi-day digital power design course tailored for engineers who want to master digital technology or just want to review the long-lost knowledge. In addition, in the coming months, Bodo Power will continue to publish a series of technical articles designed to help digital engineers with digital PSU design.
In summary, digital power is not a "magic bullet" that makes analog power redundant. Both analog and digital power supplies will exist and will live in harmony. If additional digital control is not required, analog power is no doubt an ideal choice. Conversely, in complex systems with many tightly regulated power levels, monitoring, data communication, and flexible control loops are required, and digital solutions can do their part. Fortunately, the introduction of digital power control optimized microprocessors and the emergence of new tools and trainings allow designers to choose the best solution for their immediate application.
Reverse Conducting Thyristor(RCT)
Reverse Conducting Thyristor(RCT) is also called Reverse- appreciation Thyristor.The characteristic is that a diode is connected in reverse parallel between the anode and cathode of thyristor, so that the transmitting junction of anode and cathode is short-circuited.As a result of this special circuit structure, it has high voltage resistance, high temperature resistance, short turn-off time, low switching voltage and other good performance.For example, the turn-off time of the reverse thyristor is only a few microseconds, and the working frequency is dozens of KHZ, which is better than the fast thyristor (FSCR).This device is suitable for switching power supply and UPS uninterrupted power supply. One RCT can replace one thyristor and one continuous current diode respectively.
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