US 5,017,800 AGranted

AC to DC to AC power conversion apparatus with few active switches and input and output control

AssigneeWisconsin Alumni Research Foundation

InventorDeepakraj M. Divan

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Abstract

Power conversion apparatus for AC to DC to AC power conversion includes a rectifier bridge formed of rectifying devices (24,25) connected to an AC source (21) and providing a DC output to DC bus lines (27,28). A full bridge of active switching devices (30, 31, 34, 35) is connected across the DC bus lines to which a power source such as a battery (39) may also be connected. The load (36) and the AC power supply (21) share a common neutral line (33). The output of the bridge can provide AC output power to the load through a transformer (74). The power conversion apparatus allows full control of the currents on the load lines and AC input lines, even when the input and output are asynchronous. By providing an external DC power source such as a battery (39), uninterrupted power can be supplied to the load when the AC power source fails.

Claims12

Dependent claims

Power conversion apparatus for providing AC to DC to AC power conversion comprising:

(a) AC input terminals adapted to be connected to a single phase AC power source and AC output terminals adapted to be connected to a load;
(b) a pair of DC bus lines;
(c) a rectifier bridge connected to one of the AC input terminals to rectify the current supplied thereto and connected between the DC bus lines;
(d) a DC power source operably connected to provide DC power to the DC bus lines;
(e) an inverter comprised of gate controllable active switching devices connected in a full bridge configuration across the DC bus lines and having two output nodes, the output nodes of the bridge connected to the output terminals for the conversion apparatus;
(f) a common neutral line being common to one of the input terminals to the apparatus, to one of the output terminals of the apparatus and to one of the output nodes of the inverter bridge;
(g) control means for controlling the switching of the controllable switching devices to provide AC output power at a selected frequency at the output terminals of the power conversion apparatus.

4 more elements

Power conversion apparatus for providing AC to DC to AC power conversion comprising:

(a) AC input terminals adapted to be connected to a single phase AC power source and AC output terminals adapted to be connected to a load;
(b) a pair of DC bus lines;
(c) a rectifier bridge connected to one of the AC input terminals to rectify the current supplied thereto and connected between the DC bus lines;
(d) a DC power source operably connected to provide DC power to the DC bus lines, wherein the DC source is a battery and the apparatus is adapted to function as an uninterruptible power supply to provide AC power to the output terminals from the battery when power is not being supplied to the input terminals of the apparatus;
(e) an inverter comprised of gate controllable active switching devices connected in a full bridge configuration across the DC bus lines and having two output nodes, the output nodes of the bridge connected to the output terminals for the conversion apparatus;
(f) a common neutral line being common to one of the input terminals to the apparatus, to one of the output terminals of the apparatus and to one of the output nodes of the inverter bridge;
(g) control means for controlling the switching of the controllable switching devices to provide AC output power at a selected frequency at the output terminals of the power conversion apparatus.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/414,896Filed 29 Sep 1989
Granted: 21 May 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02J 9/062
With automatic change-over , e.g. UPS systems: for AC powered loads
H02M 5/458
Using devices of a triode or transistor type requiring continuous application of a control signal: using semiconductor devices only
H02M 1/0085
Converters characterised by their input or output configuration: partially controlled bridges
Y02B 70/10
Technologies for an efficient end-user side electric power management and consumption: technologies improving the efficiency by using…