Patent EP0420628A2 successfully refreshed from Google Patents.
EP0420628A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
AC to DC to AC power conversion apparatus with few active switches and input and output control
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1990-09-27
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Granted: —
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Expires: 2010-09-27
Abstract
Abstract A power conversion apparatus for providing AC to DC to AC power conversion which is particularly adapted for use with single phase uninterruptable power supply systems. By having the power flow completely unidirectional from AC line to load, only four active switches are required to provide independent control of the input and output currents, a common neutral connection, line connection, sinusoidal input currents independent to load currents, as well as battery charge and discharge regulation. In an embodiment where low voltage battery and resonant link operation is desired, an additional switch is utilised. The apparatus utilises a rectifier bridge, a DC power source inverter having gate controllable switching devices connected in a bridge configuration and control means for controlling the switching of the controllable switching devices to provide AC output at a selected frequency, a common neutral line being utilised which is common to one of the input terminals and one of the output terminals of the apparatus and also to one output node of the inverter bridge configuration.
Inventors
- 👤 Keepakraj N. Divan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
H; H02; H02M; H02M5/00; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02M1/00; H02M1/0083; H02M1/0085; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
194 words
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 terminal 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 line; (e) an inverter comprised of gate controllable active switching devices connected in a bridge configuration across the DC bus lines and having two output nodes, one of the output nodes of the bridge connected to an 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 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 terminal of the power conversion apparatus.
Claim 2
Dependent Claim
194 words
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 terminal 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 line; (e) an inverter comprised of gate controllable active switching devices connected in a bridge configuration across the DC bus lines and having two output nodes, one of the output nodes of the bridge connected to an 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 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 terminal of the power conversion apparatus.
Claim 3
Dependent Claim
41 words
The apparatus of Claim 1 including an input inductor connected between the one input terminal to the apparatus which is connected to the rectifier bridge and an inductor connected to the output terminal which is not connected to the common line.
Claim 4
Dependent Claim
23 words
The apparatus of Claim 1 wherein the control means carries out control utilizing pulse width modulation of the switching of the switching devices.
Claim 5
Dependent Claim
48 words
The apparatus of Claim 1 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.
Claim 6
Dependent Claim
74 words
The apparatus of Claim 4 including a bypass line extending from one of the input terminals of the apparatus to one of the output terminals of the apparatus and a controlled switching device connected in the bypass line to allow AC power from the input terminals to be supplied directly to the output terminals under normal operating conditions when power is available from the AC power system to be supplied to the input terminals.
Claim 7
Dependent Claim
50 words
The apparatus of Claim 5 further including a controllable switching device connected in a line leading to an output terminal from the apparatus to be controllably switched to isolate the apparatus from the output terminals when power is being supplied from the AC power lines directly to the output terminals.
Claim 8
Dependent Claim
55 words
The apparatus of Claim 5 further including a transformer connected to the output terminals of the apparatus at a tap on the primary and wherein the bypass line is connected to the end terminals of the primary of the transformer, with the secondary of the transformer having terminals which can be connected to a load.
Claim 9
Dependent Claim
41 words
The apparatus of Claim 1 including DC resonant link means, connected between the DC source and the DC bus line, for providing a resonant transfer of DC power from the DC source to the DC bus at a selected high frequency.
Claim 10
Dependent Claim
26 words
The apparatus of Claim 8 wherein the resonant link means includes a gate controllable switching device connected between the DC source and the DC bus line.
Claim 11
Dependent Claim
37 words
The apparatus of Claim 4 wherein the control means further provides rectified power flow from the AC input terminals to charge the battery during periods of operation of the apparatus in which battery power is not required.
Claim 12
Dependent Claim
21 words
The apparatus of Claim 4 wherein the control means utilizes discrete pulse modulation for control of the gate controllable switching devices.
Claim 13
Dependent Claim
62 words
The apparatus of Claim 4 wherein the control means monitors the input terminal source current, the input terminal source voltage, the output terminal current and the output terminal voltage, and utilizes these signals to control the switching devices in a closed loop manner to control the system to seek to follow a desired output voltage, input source current, and output load current.
Claim 14
Dependent Claim
206 words
Apparatus for converting a single phase AC input to a three phase AC output comprising: (a) a pair of input terminals connected to a pair of input lines, one of the input lines having an input inductor connected therein; (b) a pair of DC bus lines and a DC power storage device connected across the bus lines; (c) a pair of rectifying diodes connected across the DC bus lines with the node connecting the diodes being connected to the input line to receive current passed through the input inductor; (d) an inverter connected between the DC bus lines comprised of controlled switching devices connected in a bridge configuration, the node between two of the switching devices being connected to the AC input line which does not have the input inductor connected therein; (e) a third line connected to the other of the controllable switching devices in the bridge to provide the output voltage between these two switching devices, the two AC input terminals and the third line constituting the three phase output terminals of the device; and (f) means for switching the switching devices of the inverter bridge to provide an AC voltage at the three output terminals of the apparatus which constitutes three phase voltages.
Claim 15
Dependent Claim
206 words
Apparatus for converting a single phase AC input to a three phase AC output comprising: (a) a pair of input terminals connected to a pair of input lines, one of the input lines having an input inductor connected therein; (b) a pair of DC bus lines and a DC power storage device connected across the bus lines; (c) a pair of rectifying diodes connected across the DC bus lines with the node connecting the diodes being connected to the input line to receive current passed through the input inductor; (d) an inverter connected between the DC bus lines comprised of controlled switching devices connected in a bridge configuration, the node between two of the switching devices being connected to the AC input line which does not have the input inductor connected therein; (e) a third line connected to the other of the controllable switching devices in the bridge to provide the output voltage between these two switching devices, the two AC input terminals and the third line constituting the three phase output terminals of the device; and (f) means for switching the switching devices of the inverter bridge to provide an AC voltage at the three output terminals of the apparatus which constitutes three phase voltages.
Claim 16
Dependent Claim
18 words
The apparatus of Claim 1 wherein the inverter comprises four switching devices connected in a full bridge configuration.
Claim 17
Dependent Claim
19 words
The apparatus of Claim 13 wherein the inverter comprises four controlled switching devices connected in a full bridge configuration.
References Cited (Backward Citations)
No citation records indexed.
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