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US 2004/0017110 A1Published application
Uninterruptible switching power supply device and method for uninterruptibly switching voltage
OwnerMau Shin Frank Yiminventor
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OwnerMau Shin Frank Yiminventor
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The present invention provides an uninterruptible switching power supply device and a method for uninterruptibly switching from AC input power to DC power, in which a high voltage circuit connected with the primary winding of the main transformer and a lower voltage circuit connected with a tap from the secondary are controlled by a PWM to operate synchronically. When the AC input is normal, the AC input power is transformed the main transformer to power a load. When the voltage of the AC input is lower than the predetermined value, the battery begins to discharge for compensating the power of the AC input. When the AC input is interrupted, the discharge of battery is transformed by the transformer in a self-coupling mode to power the load. The voltage transformation efficiency is improved with the device and method of the invention.
An uninterruptible switching power supply device, comprising:
A method for uninterruptibly switching from an AC input power to a DC power to energize a load during the brown-out or failure of the AC input power in an uninterruptible switching power supply device comprising a high voltage switching circuit being coupled to the primary winding of a main transformer, at least one low voltage switching circuit including a tap L on the secondary winding which is connected to a battery through a low voltage switch, and a PWM unit for controlling the high voltage switching circuit and the low voltage switching circuit to operate synchronically, said method comprising the following steps of:
Dependencies are inferred from the claim text.