PowerWalker VFI 1000 LE - Manual (Page 3)

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1. Product Introduction
1.1 Functions description
This product is a true online double-conversion UPS (Uninterruptible
Power Supply). It provides perfect protection for critical load such as
computer system. It can eliminate almost all mains power disturbances.
The input AC current can be corrected to a wave following the mains
voltage, so it is a high power factor system. Through the PWM control
technology, the output voltage can be a pure & stable sine wave AC
voltage.
When the mains input become abnormal, the controller will stop the
AC/DC and start the DC/DC section immediately to make sure the
DC/AC (inverter) section can continue to work. After the mains input
comeback to normal range, the DC/DC will be stopped and the AC/DC
works again. So the load is always power-supplied through inverter
without any interrupt if the UPS is turned on.
The UPS also provides an internal bypass way to make the load can be
powered by mains input directly when the UPS is off or failed.
The UPS have an internal charger for batteries, the charger will charge
the batteries when the mains is in a reasonable range on “bypass mode”
or “line mode”.