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What is UPS power switching time? What is the UPS switching time? At present, the concept of abnormal mains power supply in UPS power supply often refers to mains power outage, undervoltage, overvoltage, distortion, etc. Some lower end UPS only have one or more of these requirements. Currently, the method of rapid detection of mains power outage or undervoltage is often used when the mains zero crossing time exceeds the given time. The general rectification and filtering voltage measurement method cannot meet the requirements of rapid detection. The definition of recovery time is the time required from the start of switching from UPS power supply to inverter power supply, until the inverter output of UPS reaches 90% of the rated output voltage. This article will introduce the switching time of UPS power supply.

What is UPS power switching time

The main function of UPS power supply is to provide voltage stabilization function and charge the battery when the power is normal. When the mains power fails, the battery provides AC power to the load through conversion. So the time required to switch from mains power to battery state or from battery state to mains power is called UPS power conversion time or switching time.

Generally speaking, there is a conversion time between backup UPS power supplies and online interactive UPS power supplies, and this time value is generally less than 10ms. The online interactive UPS conversion time is 5ms.

According to the concept of UPS power conversion time, it can be seen that the smaller the desired conversion time, the better. Currently, mainstream online UPS power supplies adopt zero conversion time. Of course, for some devices, they can withstand short-term conversion, and our traditional backup and online interactive UPS can also meet the needs.

The ability of electrical appliances to withstand conversion time determines the impact of UPS conversion time. Resistive loads have no specific requirements for conversion time, while capacitive loads generally do not allow energy interruption exceeding 16 thousandths of a second, meaning that the power outage time can only be no more than 10 thousandths of a second. The problem is that new electrical appliances, especially those with monitoring or large arcs, can experience instant power outages, leading to mass production scrap. The monitoring equipment itself may malfunction and produce incorrect values, meaning it cannot be powered off at all.

UPS power switching method

● UPS power synchronous switching

The inverter power supply and AC bypass power supply channels use static switches as switching elements. It uses fast thyristors with a conduction time of milliseconds, which can technically meet the requirement of continuous power supply with zero switching time. Therefore, once the thyristor is turned on, it only recovers its blocking ability when the current flowing through it is lower than its minimum holding current or when the anode potential of the thyristor is lower than the cathode potential. From this, it can be seen that in order for a thyristor static switch to turn off, the condition is that the current flowing through it is lower than its minimum holding current. Control principle: The inverter power supply and AC bypass power supply are in a phase-locked synchronous working state. Two static switches are used. When the UPS logic control circuit performs the switching task, a control command is first issued to block the trigger pulse of the static switch thyristor that is conducting. At the same time, the current flowing through the thyristor is continuously detected. Once the current is lower than its minimum holding current, the trigger pulse command is immediately sent to the thyristor that is in the off state to achieve the switching task of the two static switches.

● Asynchronous switching of UPS power supply

It adopts a control method of first disconnecting and then connecting to perform the switching task, first disconnecting the inverter bypass power supply, and then connecting the AC bypass power supply. Therefore, this switching operation is subject to power interruption, and within one second, the UPS power supply loses its uninterrupted power supply effect.

The power supply time of UPS power supply

1. The impact of quantity on power supply duration

The quantity is directly proportional to the duration of power supply, which means that the more batteries used, the longer the power supply time can be provided after a power outage. Therefore, before purchasing, it is necessary to confirm the power level and duration required by the customer, so that the manufacturer can decide on the quantity to be used.

2. The impact of load on power supply duration

The duration of power supply is not only related to the number of batteries, but also greatly influenced by the load carried. If the industrial load is large, the power supply requires a larger power supply, and the corresponding number of batteries also needs to increase. If the battery remains unchanged, the power supply time will also be shortened.

3. The relationship between the number of uninterruptible power supply batteries and the load power

If the load increases while the power supply duration remains unchanged, it is necessary to add UPS batteries. If the number of miles of battery is not increased, the backup power supply provided will be shortened.

In general, for personal or small office team computer use at home, conventional backup UPS power supplies and online interactive UPS can fully meet the needs of this group of people. This can to some extent save unnecessary expenses and avoid wasting resources. For large data control centers, financial banking systems, or research sites, due to the importance of such work, the performance requirements for UPS power supplies are particularly high. Therefore, zero conversion online UPS power supplies without conversion time should be selected.

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