UPS True ON Line is the term used for mission critical UPS Power Systems, that always hold the load without any break even a millisecond break., hence Always ONLINE.
An immediate difference between True On Line and an Off-line system is that the battery charger is replaced by a ‘rectifier/charger’ unit. The rectifier/charger may be two separate units or a combined power unit. When the mains supply is present the battery charger charges the battery and the rectifier supplies the inverter with a stable DC voltage. In the absence of the mains supply the charger shuts down and the inverter DC supply is provided by the battery, which begins to discharge. The connection between the rectifier/battery and inverter is often known as the DC busbar, or DC bus.
As part of its control function the rectifier/charger generally includes an input current limit feature to provide overload protection, and a DC overvoltage shutdown mechanism to protect the battery / inverter and DC filter components.
This UPS design, which is sometimes also referred to as a double conversion UPS, offers the greatest degree of critical supply integrity in that the load is supplied with processed power at all times. As the load is powered from the inverter under normal circumstances, it is well protected from input supply aberrations because the rectifier and inverter act as a barrier to mains borne noise and transient voltage excursions, in addition to providing a well-regulated output voltage.
If the input supply goes outside a preset voltage range (typically +10% to -20%), or suffers a total failure, the inverter continues operating from battery power and the event is totally transparent to the load as there is no transfer operation involved. When operating from battery power the inverter supplies the same degree of supply regulation as when the main is present.
If the mains is not restored before the battery reaches its end-of-discharge voltage the inverter shuts down and, in some models, the static switch may attempt to transfer the load to the bypass line. The result of the transfer action depends on whether or not the module’s bypass line is connected to the same mains supply as the module’s rectifier, and if the bypass supply is live (known as a split bypass system).
All of this information doesn’t help if all you require is a reliable UPS Power System.
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