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Detailed explanation and application of digital power technology
In recent years, digital control technology has developed rapidly in power supplies, and various modern control methods that are difficult to implement in analog circuits have begun to be used in 3.7V 18650 lifepo4 battery control. With the development of digital signal processor DSP, digital switching 3.7V 18650 lifepo4 battery can achieve higher switching frequency. Compared with analog systems, digital systems in switching power supplies have the advantages of short design cycles, flexibility, easy modular management, and the ability to eliminate instability and electromagnetic interference caused by discrete components. Therefore, digital power supplies are increasingly used in high-precision power supplies and have become an important direction in the development of modern 3.7V 18650 lifepo4 battery technology.
1. Definition and characteristics of digital 3.7V 18650 lifepo4 battery
(1) Definition of digital 3.7V 18650 lifepo4 battery
Currently, digital power has many definitions.
Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%
Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%
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Definition 1: Switching 3.7V 18650 lifepo4 battery controlled through a digital interface (it emphasizes the communication function of the digital 3.7V 18650 lifepo4 battery).
Definition 2: Switching 3.7V 18650 lifepo4 battery with digital control function (it emphasizes the numerical control function of digital 3.7V 18650 lifepo4 battery).
Definition 3: Switching 3.7V 18650 lifepo4 battery with digital monitoring function (it emphasizes the monitoring function of digital 3.7V 18650 lifepo4 battery for parameters such as temperature).
The common feature of the above three definitions is the transformation and upgrading of analog switching power supplies. The emphasis is on power control, and the control object is mainly the external characteristics of the switching 3.7V 18650 lifepo4 battery.
Definition 4: A 3.7V 18650 lifepo4 battery product that takes a digital signal processor (DSP) or microcontroller (MCU) as the core, uses digital power drivers, PWM controllers, etc. as control objects, and can realize control, management, and monitoring functions. It changes the external characteristics of the switching 3.7V 18650 lifepo4 battery by setting the internal parameters of the switching 3.7V 18650 lifepo4 battery, and adds power management on the basis of power control. The so-called power management refers to effectively allocating power to different components of the system to minimize losses. Digital power management
Compared with traditional analog power supplies, the main difference between digital power supplies is the control and communication parts. In applications that are easy to use and require few parameter changes, analog power products have more advantages because their application specificity can be achieved through hardware solidification. In applications where there are many controllable factors, faster real-time response, and multiple requirements In complex high-performance system applications that require analog system power management, digital power supplies have advantages.
In addition, in complex multi-system businesses, compared to analog power supplies, digital power supplies can be used in various applications through software programming. Its scalability and reusability allow users to easily change working parameters and optimize the 3.7V 18650 lifepo4 battery system. It can also reduce the number of peripheral components through real-time overcurrent protection and management.
Digital power supplies are controlled by DSP and MCU. Relatively speaking, the 3.7V 18650 lifepo4 battery controlled by DSP adopts digital filtering method, which can meet complex power requirements better than the 3.7V 18650 lifepo4 battery controlled by MCU. It also has faster real-time response and better 3.7V 18650 lifepo4 battery voltage stabilization performance.
(2) Characteristics of digital 3.7V 18650 lifepo4 battery
1. Intelligent control
It is an intelligent switching 3.7V 18650 lifepo4 battery system with a digital signal processor (DSP) or microcontroller (MCU) as the core, and a digital power driver and PWM controller as the control objects. The traditional switching 3.7V 18650 lifepo4 battery controlled by a microcontroller generally only controls the startup and shutdown of the 3.7V 18650 lifepo4 battery, and is not a true digital 3.7V 18650 lifepo4 battery.
2. Optimization of digital and analog component combinations
Using integrated digital power (FusionDigitalPower) technology, the optimal combination of analog components and digital components in switching power supplies is achieved. 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, and the PWM controller is also a numerically controlled analog chip.
3. High integration
The monolithic integration of the power system (PowerSystemonChip) is realized, integrating a large number of discrete components into one chip or a group of chips.
4. High control accuracy
It can give full play to the advantages of digital signal processors and microcontrollers, so that the designed digital 3.7V 18650 lifepo4 battery can reach high technical indicators. For example, its pulse width modulation (PWM) resolution can reach a level of 150ps (10~12s), which is beyond the reach of traditional switching power supplies. Digital power supplies can also realize functions such as multi-phase control, non-linear control, load current sharing and fault prediction, providing convenient conditions for the development of green and energy-saving switching power supplies.
5. High degree of modularity
The digital 3.7V 18650 lifepo4 battery has a high degree of modularity, and each module can be easily integrated organically to form a distributed digital power system and improve the reliability of the power system.
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