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The development of the PC industry has a history. CPUs, GPUs, motherboards, etc. are constantly updating, and recent hard disk storage has begun to rise to the frenzy of solid-state drives. In contrast, power supply has not developed for several years. Actually, digital control technology has recently developed rapidly. The digital system has the advantages of short design cycle, flexibility, easy modular management, elimination of instability caused by discrete components, and electromagnetic interference in the switching power supply. Therefore, digital power supplies have become more and more widely used in high-precision power supplies and have become an important direction for the development of modern power supply technologies.
At present, there are many definitions of digital power supply.
Definition 1: The switching power supply controlled through the digital interface (it emphasizes the communication function of the digital power supply).
Definition two: Switching power supply with digital control function (it emphasizes digital power digital control function).
Definition 3: Switching power supply with digital monitoring function (it emphasizes monitoring of temperature and other parameters of digital power supply).
Definition 4: A digital signal processor (DSP) or microcontroller (MCU) as the core, the digital power supply driver, PWM controller, etc. as the control object, can realize the control, management and monitoring functions of the power supply products. It is to set the internal parameters of the switching power supply to change its external characteristics, and adds power management to the power supply control. The so-called power management refers to the effective distribution of power to different components of the system to minimize losses. Digital power management (such as power sequencing) must all use digital technology.
Digital power also includes the following features:
1. Control intelligence
It is a intelligent switching power supply system which is composed of a digital signal processor (DSP) or a microcontroller (MCU) as a core and a digital power supply driver and a PWM controller as control objects. The traditional switching power supply controlled by a microcontroller generally only controls the start-up and shut-down of the power supply and is not a true digital power supply.
2. Combination of digital and analog components
The use of integrated digital power (Fusion Digital Power) technology to achieve the optimal combination of analog components and digital components in switching power supplies. For example, the analog component MOSFET driver used in the power stage can be easily connected to the digital power controller and implement various protection and bias power management. The PWM controller also belongs to the digital control analog chip.
3. High integration
The power system on chip (Power System on Chip) is realized, and a large number of discrete components are integrated into a single chip or a group of chips.