The power supply method of the data collector needs to be adapted to the usage scenario (laboratory/industrial site/outdoor mobile), battery life requirements, and installation conditions. The core is divided into three categories: "wired power supply", "wireless power supply", and "energy storage power supply". The adaptation scenarios and advantages and disadvantages of different methods vary significantly. The specific classification and details are as follows:
1、 Wired power supply (stable and reliable, suitable for fixed scenarios)
Wired power supply is a very basic and commonly used method, with the core advantage of "continuous stability and no battery anxiety", suitable for long-term fixed installation of data collectors (such as laboratory monitoring and industrial production line data collection).
1. AC mains power supply (AC220V/110V)
Principle: Connect the mains power (AC220V, domestic standard) through a power adapter; AC110V， Convert to the DC voltage required by the collector (such as DC5V, 12V, 24V) according to overseas standards and provide direct power supply.
Adaptation scenarios: laboratory equipment, data collectors inside industrial control cabinets, indoor fixed monitoring points (such as building energy consumption data collection).
Advantages: Continuous and stable power supply, no need for frequent maintenance; Can drive high-power collectors (such as multi-channel devices with real-time transmission modules).
Disadvantage: Dependent on the power grid, unable to work after power outage (requires UPS backup power supply); Installation is restricted by the power cord and cannot be moved.
2. DC bus power supply (DC12V/24V)
Principle: Connect to industrial DC bus (such as DC24V industrial power rail) or centralized DC power supply, suitable for unified power supply of multiple collectors in industrial scenarios.
Adaptation scenarios: industrial automation production lines, PLC matching collectors, sensor network centralized power supply (such as 485 bus acquisition systems).
Advantages: Stable voltage, strong anti-interference ability (suitable for industrial electromagnetic environment); Unified power supply for multiple devices, simple wiring, and easy maintenance.
Disadvantages: Need to deploy DC bus in advance, poor flexibility; Bus voltage drop may lead to insufficient power supply to remote collectors (requiring control of wiring length or increase of wire diameter).
3. PoE Power over Ethernet
Principle: Data and power are transmitted simultaneously through Ethernet cables (CAT5e/CAT6) without the need for additional power cords, following the IEEE802.3af (15.4W), 802.3at (30W), and 802.3bt (90W) standards.
Adaptation scenarios: Network based collectors (such as environmental monitoring collectors with Ethernet interfaces), equipment in computer rooms, collectors installed on ceilings/high places (difficult wiring scenarios).
Advantages: One line connection for data and power, low wiring cost; Flexible installation, suitable for long-distance power supply (maximum 100 meters for single segment network cable).
Disadvantage: Requires a PoE switch or PoE injector, slightly higher hardware cost; Due to power limitations of the network cable, it is unable to adapt to high-power collectors.
2、 Energy storage power supply (wireless mobile, suitable for off grid scenarios)
Energy storage power relies on batteries or supercapacitors to store electrical energy, with the core advantage of "wireless freedom and adaptability to off grid environments". It is suitable for outdoor mobile data collection and temporary monitoring scenarios, and endurance is a key indicator.
1. Disposable battery power supply
Types: Dry batteries (AA/AAA type, 1.5V), lithium primary batteries (CR2032, ER14505, 3.6V), alkaline batteries, etc.
Adaptation scenarios: low-power collectors (such as wireless temperature and humidity collection nodes, disposable environmental monitoring terminals), short-term temporary monitoring (such as temporary data collection at construction sites).
Advantages: No need to charge, ready to use; Small size and light weight, suitable for miniature collectors; Low cost.
Disadvantages: Limited battery life (depending on power consumption and battery capacity), requiring frequent replacement during high-frequency data acquisition; Abandoned batteries have environmental pressure.
2. Rechargeable battery power supply
Types: Lithium batteries (lithium polymer batteries, 18650 lithium batteries, 3.7V), nickel hydrogen batteries (AA/AAA type, 1.2V), lead-acid batteries (12V, high-capacity scenarios).
Adaptation scenarios: portable data collectors (such as handheld data recorders), outdoor long-term monitoring (such as soil moisture collectors), mobile detection devices (such as on-site environmental sampling collectors).
Advantages: Rechargeable, low long-term usage cost; Wide range of capacity options (from mAh micro batteries to kWh energy storage batteries).
Disadvantage: Requires regular charging or replacement; The low-temperature performance of lithium batteries decreases significantly (capacity decreases significantly below -20 ℃), while lead-acid batteries are bulky and heavy.
3. Super capacitor power supply
Principle: Utilizing the high capacity and fast charging and discharging characteristics of supercapacitors to store electrical energy, usually used in conjunction with other power supply methods (such as solar energy, induction charging) as temporary energy storage or backup power.
Adaptation scenarios: high-frequency short-term collection (such as vibration data collectors), emergency power supply in case of sudden power interruption (such as protecting collected data from loss), and low-temperature environment (-40 ℃~85 ℃) collectors.
Advantages: Long charging and discharging life (up to 100000 times or more); Excellent low-temperature performance, no risk of battery leakage; Fast charging speed.
Disadvantages: Low energy density (larger volume than batteries); The self discharge rate is high, making it impossible to provide long-term independent power supply.