US3761733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for uninterruptable power supply to a load from two or more a.c. power sources
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1972-08-25
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Granted: 1973-09-25
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Expires: 1992-08-25
Abstract
Abstract The present invention relates to an arrangement for uninterruptable power supply to a load, for example a data processing equipment. To the load at least two A.C. power supplies are connected each via a pair of antiparallel connected controlled rectifiers, for example thyristors. One rectifier in each pair is brought to its conductive state simultaneously as the corresponding rectifier in all the other pairs and remains in this state as long as the voltage across and the current through the load have the same polarity during one half-period. During the next half-period the other rectifier in all the pairs is brought to its conductive state. Upon failure in one of the power supplies, for example the mains, both the rectifiers in the pair connected to this supply will become blocked and power to the load will be delivered from the other power supply or supplies via the other controlled rectifier pairs.
Inventors
- 👤 T Wolpert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:35
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
An arrangement for uninterruptable power supply from two or more A.C. power sources giving output voltages of mutually equal frequency and in the main of similar phase relation comprising for each of said A.C power sources a pair of controlled rectifier elements connected in antiparallel with each other, said pair being on one hand connected to one of said power sources and on the other hand to a load, controlling means for supplying to the control electrode of each of said rectifiers control pulses with a repetition frequency which is equal to the frequency of the output voltage from said A.C. power sources, said control pulses being delivered simultaneously to those rectifiers in each of said pairs which have the same pole connected to one terminal of the power source, respEctively, the first element in said pair being supplied with control pulses during a certain part of a halfperiod of said output voltage and the second element in said pair being supplied with control pulses during the corresponding part of the next following half-period of said output voltage.
Claim 2
Dependent Claim
178 words
An arrangement for uninterruptable power supply from two or more A.C. power sources giving output voltages of mutually equal frequency and in the main of similar phase relation comprising for each of said A.C power sources a pair of controlled rectifier elements connected in antiparallel with each other, said pair being on one hand connected to one of said power sources and on the other hand to a load, controlling means for supplying to the control electrode of each of said rectifiers control pulses with a repetition frequency which is equal to the frequency of the output voltage from said A.C. power sources, said control pulses being delivered simultaneously to those rectifiers in each of said pairs which have the same pole connected to one terminal of the power source, respEctively, the first element in said pair being supplied with control pulses during a certain part of a halfperiod of said output voltage and the second element in said pair being supplied with control pulses during the corresponding part of the next following half-period of said output voltage.
Claim 3
Dependent Claim
95 words
An arrangement as claimed in claim 1, wherein at resistive load the control pulses are supplied during the whole half-period of said alternating voltage while at resistive-inductive load the control pulses are supplied only during the part of the half-period when both the voltage across and the current through the load has the same polarity, whereby at voltage reduction or short-circuiting in one of said voltage sources the voltage across the load remains uninfluenced and the power supply occurs from other voltage sources to the load, while no equalizing currents between the voltage sources arise.
Claim 4
Dependent Claim
66 words
An arrangement as claimed in claim 1, wherein across each pair of said rectifier elements which with unlike poles are connected to the same alternating voltage source 11, 12 a series connection of a capacitor C1 and a resistor R1 is connected in parallel, in purpose to make the start of the arrangement easier and to prevent the rise of rapid voltage changes across the rectifiers.
Claim 5
Dependent Claim
142 words
An arrangement as claimed in claim 1, wherein an arrangement for generation of control pulses to said controlled rectifier elements includes a first transformer 30, 51, 80 with partly a primary winding 31, 52, 81 which in series with one or several impedances 36, 53, 81a are connected to the poles of one or several of said power sources 11, 12 and partly a number of secondary windings 38, 39, 55, 56, S19-S22, from which voltages are received, which are mutually 180* out of phase and partly a number of rectifier elements 40, 41, 59, 60 being connected to each one of the voltage outputs with mutually equal poles, the opposite poles of the rectifier elements being connected to the control electrodes of said controlled rectifier elements 19-22, which periodically connect the voltage source 11, 12 in question to the load 10.
Claim 6
Dependent Claim
42 words
An arrangement as claimed in claim 4, wherein a voltage limiter consisting of two diodes 42, 42a, 57, 58 connected together with opposite conducting directions, being arranged in connection to the transformer, in purpose to transform the pulses to square wave form.
Claim 7
Dependent Claim
108 words
An arrangement as claimed in claim 4, wherein controlled electronic rectifiers, for example transistors 61, 70 are arranged in series with the terminals for the control voltage pulses and that the control electrodes of said rectifiers are supplied with a control voltage from another transformer 63, 63a, the primary winding 64, 64a of which is fed in series with the load 10 and which is arranged to give control pulses to the electronic rectifiers 61, 70 so that these are conducting only during such a long time of each half-period as the voltage impressed on the load and the current flowing through said load having the same polarity.
Claim 8
Dependent Claim
26 words
An arrangement as claimed in claim 4, wherein the primary winding of said first transformer 30, 51, 80 is connected in parallel with the load 10.
Claim 9
Dependent Claim
36 words
An arrangement as claimed in claim 4, wherein the primary winding of said second transformer 63, 63a is connected in parallel with a connection element 82, 83 which is inserted in series with the load 10.
Claim 10
Dependent Claim
38 words
An arrangement as claimed in claim 8, wherein said connection element consists of two diodes 82, 83 connected in parallel with each other and with mutually different conducting direction and with in the main mutually equal threshold values.
References Cited (Backward Citations)
US3662182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |