Uninterruptible power supply having an integrated transformer

摘要

An interruptible power supply (UPS) has a surge cancellation and electromagnetic interference (EMI) prevention device, a charger, a battery set and a power converter. The power converter has multiple power switches, an integrated transformer and a controller. An input terminal of the surge cancellation and EMI prevention device is connected with the AC mains, and an output terminal is connected with the integrated transformer. The charger is connected with the battery set. The battery set is connected with the power switches. The integrated transformer has a primary side having a first winding and a second winding serially connected. The first and second windings respectively have multiple sub-windings. The first winding is connected with the power switches. The second winding is connected with a power output terminal and shares a part of the first winding, thereby decreasing turns of the windings and reducing the size and cost of the UPS.

主权项

1. An uninterruptible power supply (UPS) having an integrated transformer, comprising:
a set of power output terminals; a surge cancellation and electromagnetic interference (EMI) prevention device having:
an input terminal adapted to connect with the AC mains; andan output terminal connected with the set of power output terminals through two input switches; a charger having:
an input terminal adapted to connect with the AC mains; andan output terminal; a battery set connected with the output terminal of the charger; a power converter being a full-bridge converter and having:
a set of power switches with two upper arm switches and two lower arm switches respectively and serially connected to the upper arm switches; andan integrated transformer having a primary side, wherein the primary side has:
a first winding connected with the set of power switches, wherein the primary side has a first sub-winding, a second sub-winding and a third sub-winding serially connected, each of the first, second and third sub-windings has a first end and a second end, wherein the first end of the first sub-winding and the second end of the first sub-winding are respectively connected to two serial nodes of the two upper arm switches and the two lower arm switches to constitute the first winding; anda second winding serially connected with the first winding, and connected with the set of power output terminals, wherein the first end of the first sub-winding and the second end of the third sub-winding are connected with the set of power output terminals to constitute the second winding; andan automatic voltage regulator having a first switch and a second switch, wherein each of the first switch and the second switch has two contact points and a common point, the common point is selectively connected with one of the contact points, the common point of the first switch is serially connected with one of the input switches and then connected with the output terminal of the surge cancellation and EMI prevention device, and the common point of the second switch is connected with the set of power output terminals, and the first end of the first sub-winding and the second end of the second sub-winding are respectively connected with the corresponding contact points of the first and second switches.