Analysis of four working methods of UPS power supply

UPS is a constant voltage and constant frequency uninterruptible power supply with the energy storage device and inverter as the main component. Its main function is to supply power to electronic equipment reliably and uninterruptedly through the UPS system. Depending on the usage, the UPS can be converted into four different modes of operation: normal operation, battery operation, bypass operation, and bypass maintenance.

1. Normal operation mode

El fuente de alimentación principle of the uninterruptible power system is that when the mains is normal, the machine will convert the alternating current of the mains into direct current, and then charge the batería for use when the power is interrupted; here I emphasize that the sistema de alimentación ininterrumpida is not only when the power is cut off. When the voltage is too low or too high, instantaneous surge, etc., which is enough to affect the power quality of the normal operation of the equipment, the uninterruptible power supply system will operate to provide stable and clean power for the equipment.

When the main supply is normally supplied, the mains is divided into two loops to act simultaneously after the filter circuit. One is to charge the battery pack through the charging circuit, and the other is to pass through the rectifier circuit as the input of the inverter, and then pass through the rectifier circuit. The conversion of the inverter provides power to the load; it can be seen that the output of the online sistema de alimentación ininterrumpida is completely supplied by the inverter, so regardless of the quality of the mains power, the output is stable and not affected.

2. Cómo funciona la batería

Once the mains is abnormal, the DC power stored in the battery is converted into AC power. At this time, the input of the inverter is supplied by the Paquete de batería, and the inverter continues to provide power for the load to continue to use, so as to achieve the function of uninterrupted power supply. The power source of the uninterruptible power system is the battery, and the capacity of the battery is limited, so the sistema de alimentación ininterrumpida will not supply unlimited power like the mains. The power supply time must be limited. To prolong the discharge time, a long-term UPS must be purchased.

3. Bypass operation mode

When the online Unión Postal Universal está sobrecargado, el comando de bypass (manual o automático), el inversor está sobrecalentado o la máquina está averiada, el Unión Postal Universal Generalmente convierte la salida del inversor en salida bypass, es decir, alimentada directamente por la red eléctrica. Dado que la fase de la frecuencia de salida del inversor Unión Postal Universal needs to be the same as the phase of the mains frequency during bypass, the phase-locked synchronization technology is adopted to ensure that the UPS output is synchronized with the mains. The bypass switch bidirectional thyristor works in parallel, which solves the problem of bypass switching time, truly achieves uninterrupted switching, and the control circuit is complex. It is generally used in medium and high-power Unión Postal Universal. If it is overloaded, the load must be artificially reduced, otherwise, the bypass circuit breaker will automatically cut off the output.

4. Bypass maintenance method

Cuando el Unión Postal Universal is being repaired, the normal fuente de alimentación of the load equipment is ensured by manual bypass. When the maintenance operation is completed, the Unión Postal Universal is restarted and the Unión Postal Universal is turned into a normal operation. Extremely low maintenance rate, MTTR of 150,000 hours, greatly improves UPS availability.