Transient recovery time: The time required for the output voltage to recover to the specified range when the load suddenly changes (0-100%, 100% -0%), usually in milliseconds (ms).

Filter: A device used to eliminate noise, filtering the input or output to obtain pure alternating current.

Shielding: A means of isolating and blocking electromagnetic radiation using physical principles.

Lightning tube: It is a high-voltage protective component used at the input end of equipment. If the voltage at both ends exceeds its protection specification value, a short circuit phenomenon will be inside it and absorb the input overvoltage.

Apparent Power: VA, the change in power is related to the voltage and current of RMS (ROOT MEAN SQUARE).

Datamachine: This device is a device that converts analog signals from a telephone line into digital signals that can be read by a PC, or converts digital signals from a PC into analog signals for easy transmission over a telephone line.

Random Access Memory (RAM): Dynamically stores CPU-required data.

Simple Network Management Protocol (SNMP): It is a widely used network management protocol that can help network administrators manage various devices in TCP/IP networks, without complex instructions.  There are only two types of instructions in basic concepts: FETDH-STORE (storage fetch). Simplicity, stability, and flexibility are its major advantages.

Instantaneous voltage drop: Some may last from a few milliseconds to hundreds of milliseconds. If the voltage drop persists for a long time or frequently occurs, it can cause computer and electrical equipment malfunctions and reduce their lifespan.

Phase-locked circuit: A technical specification of phase-locked speed, which is based on the principle that when the input voltage enters the UPS, the UPS will control the frequency of its output power supply to be the same as the input power supply frequency, thereby achieving the same input and output frequency and no time difference in phase. However, when there is a time difference between the output frequency and the input frequency, the UPS is powered by the battery or does not output power to the load.

Three phases: the standard power system is a three-phase power supply. The first phase of the solid is a cosine wave with a phase difference of 120 degrees, while the single phase is just one of the three phases.

Zero line: in a single-phase power supply system, the function of the zero line is to conduct feedback current, which is distributed in the same area with the socket end and grounding.

Distortion: Distortion is divided into waveform distortion, voltage distortion, etc. Whether it is volume distortion, it is calculated as a percentage, and its magnitude is related to harmonics, voltage, current, and power factor. (Refer to HARMONIC)

Mains power: We refer to alternating current (AC), which includes voltage, current, and frequency. The frequency can be divided into two types: 50HZ (Hz) and 60HZ (Hz), with a voltage distribution ranging from 100VA-240VA. The normal AC waveform is usually a sine wave, but it is not suitable for motors or equipment with inductive loads when using stepped waves to form a waveform similar to a sine wave.


Radiofrequency (RF): This is a type of electromagnetic field that exists in communication devices or computer operating devices. Some sources are transmitted through the device's wiring or antenna, and in some cases, the amplitude may be too large, causing electrical transmission interruptions or computer operating device failures.

Synchronization: The output sine wave power generated by UPS and the input AC power supply are both sine waves, and both need to maintain frequency and phase consistency. This is synchronization.

SYNCHRONOUS: A type of converter located between two power supplies and a load

Burst current: When an electronic device is connected to a power socket, due to the device having been shut down for some time, the instantaneous addition of power will cause the capacitor in the device to charge with current, resulting in an instantaneous high current of 3-10 microseconds, which is released by the power cord, affecting other electronic devices.

Surge: an instantaneous high voltage, which ranges from hundreds of volts (amperes) to thousands of volts (amperes) or more, and lasts from a thousandth of a second to hundreds of millionths of a second. This is a great potential danger for electronic equipment, which may cause data loss or shorten the life of electronic parts, and may cause equipment damage or more serious consequences. There are two reasons for generating sudden waves: natural occurrences such as lightning strikes; Secondly, electronic devices instantly add loads.

Surge suppressor: Effectively absorbs the overvoltage and overcurrent generated by the surge, maintains normal voltage and current supply to electronic equipment, reduces the harm caused by the surge, and extends its service life. As the generation of surges is an occasional phenomenon, it is necessary to install surge suppressors for electrical equipment.

Note: Currently, many products replace surge suppressors with surge suppression circuits.