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Terms related to power supply of UPS power supply (2)
- Apr 27, 2018 -

Terms related to power supply of UPS power supply (2)

Current peak factor (CF): The current peak factor is the ratio of the peak value of the current cycle waveform to the effective value. Since the energy absorbed by the computer load when it receives a sinusoidal voltage does not necessarily follow a sine law, it will produce a high peak current (between 2.4 and 2.6 times the current). Therefore, the UPS design should be able to provide a CF value greater than 3 Current to meet the application of computerized load.

 

Battery in series/parallel connection: A plurality of batteries with the same capacity and capacity are connected in series according to a certain polarity and connected in series to form a battery pack. A plurality of batteries or battery packs with the same voltage are connected at the same end with the same polarity to form a parallel output. For parallel connection.

 

Battery management system: Used to protect the UPS battery and extend its life to achieve the best charging effect. The battery management system includes software and hardware, including battery characteristics determination, automatic selection of charging modes, automatic alarms, and special battery charging.

 

Short circuit: refers to the DC positive and negative poles of the circuit or the AC live line directly connected to the zero and ground lines. Short circuit can cause serious overload, generate large short-circuit current, and may cause equipment to burn or even cause fire.

 

Ground, Neutral, and FireWire: The earth is a good conductor. The ground wire is connected to the ground via a buried electrode. The mains transmission is a three-phase system and has a neutral line. When the three-phase balance, the neutral line current is zero, which is commonly called “zero line”. Another feature of the neutral line is that the ground line is in the overall configuration of the system. The electrical input is shorted and the voltage difference is close to zero. There are 220 voltages in the three phases and the zero line of the three-phase electricity, which can cause electric shocks to people, commonly known as "Firewire." There are strict standards for the installation and arrangement of electrical circuits. In practice, the correct assembly of ground, neutral, and live wires in accordance with standards is critical to safety.

 

Electromagnetic Compatibility (EMC): The generic term for the radiated waves and conducted waves of a device.

 

Safety Extra Low Voltage (SELV): The IEC regulations specify the limits for the rated safety voltage of electrical equipment. In this regulation, it is indicated that the voltage must be high or the AC power supply must be carefully guarded against separation or difficult to access to ensure the safety of personnel.

 

Crest Factor (CF): The so-called CF is the ratio of the peak value of the periodic waveform to the effective value. Since a computer-based load receives a sinusoidal voltage, CF (2.4 to 2.6 times the current) is generated. Therefore, the UPS design often needs to be able to provide a CF value of 3 to meet the requirements of computer-based loads.

 

Discharge tube: A high-voltage protection element used at the input of the device. If the voltage at both ends is higher than its protection specification value, a short circuit will occur inside it and the input over-voltage will be absorbed.

 

Emissive Wave (EMR): This is a kind of space electromagnetic wave, which exists in communication equipment or computer-operated equipment. Some of the wave sources are radiated to the space through the equipment's wiring or electrical antennas. In some cases, it may be because Excessive amplitude wave causes problems such as interruption of electrical transmission or malfunction of computer operating equipment.

 

Float and Equal Charge: Both float and equal charge are battery charging modes.

 

1. Floatation working principle: When the battery is in the full state, the charger will not stop charging, it will still provide a constant float voltage and a very small float current to the battery, because once the charger stops charging, the battery will naturally release energy , so the use of floating charge to balance this natural discharge, small UPS usually adopts floating charge mode.

 

2. Equal charge working principle: The battery is charged by constant current and fixed time, and charging is faster. This mode also helps to activate the chemistry of the battery, which is often used by professional maintenance personnel when servicing the battery.

 

Note: The smart charger has the function of automatically changing the float charge and equal charge according to the working state of the battery, which can give full play to their respective advantages of float charge and equal charge, and achieve rapid charge and prolong battery life.

 

Load regulation: The output voltage regulation accuracy when the load changes.

 

Overload: The UPS has a specified load capacity. Overload exceeds the rated load.

 

Overload protection: self protection when the load is overloaded.

 

Overvoltage protection: When the input or output voltage exceeds the safe range, the UPS automatically performs the action of disconnecting the input or protecting the output.

 

Overheat protection: The power components that are most prone to heat from the UPS are equipped with temperature sensors. The UPS shuts down or bypasses when overheated.