Uninterruptible power supply (UPS) is a system equipment that connects batteries (mostly lead-acid maintenance free batteries) to the host and converts direct current into mains power through module circuits such as the host inverter. It is mainly used to provide stable and uninterrupted power supply to a single computer, computer network system, or other power electronic equipment such as solenoid valves, pressure transmitters, etc., to ensure the uninterrupted operation of these equipment and instruments, and to prevent computer data loss, telephone communication network interruption, or instrument loss of control. Uninterruptible power supply is widely used in mines, aerospace, industry, communication, national defense, hospitals, computer business terminals, network servers, network equipment, data storage equipment, emergency lighting systems, railways, shipping, transportation, power plants, substations, nuclear power plants, fire safety alarm systems, wireless communication systems, programmable switches, mobile communication, solar energy storage energy conversion equipment, control equipment and emergency protection systems Personal computers and other fields Technical indicators
Most inverters in the new UPS adopt PWM technology, and quartz crystal oscillation is used to control the frequency of the inverter. The voltage negative feedback circuit ensures the stability of the output voltage. It has a series of advantages of a switching power supply, which ensures stable power output by accurately adjusting the pulse width. At the same time, the application of switching power supply technology also greatly reduces its own losses. The main technical indicators are as follows:
(1) Rated output power and maximum output power (2) Switching time (3) Output voltage stability, reference value ± 0.5%~± 2% (4) Output frequency stability, reference value ± 0.01%~± 0.5% (5) The output waveform is pure (sine wave output), with voltage distortion less than 1%, and there is no problem of latent wave distortion (6) High efficiency and low loss. The reference index is higher than 90% (7) Fault free working time. Due to the adoption of advanced technologies such as microprocessor monitoring technology and advanced GBT driven SPWM, the current UPS has reached a very high level of reliability. For large UPS power supplies, the annual mean time between failures (MTBF) of a single unit has exceeded 200000 hours. If a multi machine "redundant" UPS power supply system with dual bus output is adopted, its MTBF can even reach the order of 10 million hours Uninterruptible Power Supply Testing Items and Standards
All Parameters of Uninterruptible Power Supply System (UPS) Electromagnetic compatibility requirements IEC 62040-2:2016
Technical specifications for energy-saving certification of uninterruptible power supply with all parameters CQC 3108-2011
Technical specifications for energy-saving certification of uninterruptible power supply with input power factor CQC 3108-2011 5.2.1
Technical specifications for energy-saving certification of uninterruptible power supply with efficiency CQC 3108-2011 5.2.2
Technical specifications for energy-saving certification of uninterruptible power supply with no-load input power CQC 3108-2011 5.2.3
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