US4914559A
Expired / Lapsed
US
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Power factor improving arrangement
Assignee: AT&T Inc
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Filing: 1989-03-27
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Granted: 1990-04-03
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Expires: 2009-03-27
Abstract
Abstract A power factor compensator (18) for a power converter (17) comprises an L-C circuit connected in series between the power converter and the converter's A.C. power source (13). The values of the inductor (30) and the capacitor (31) of the compensator circuit are selected to cause the L-C circuit to resonate at a frequency higher than the power source frequency, preferably at a frequency ranging between 1.4 and 3.5 times the power source frequency, in order to achieve a power factor within the range of about 0.65 to 0.95. A resonant frequency of about twice the power source frequency has been experimentally found to give particularly good performance.
Inventors
- 👤 Cecil W. Deisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:49
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4266; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
84 words
An arrangement for improving power factor of a rectifier drawing power from a power source having a substantially sinusoidal voltage with an operating frequency, comprising: in combination, first inductive means and capacitive means connected in series with each other and for connection in series between a rectifier drawing power from a power source and the power source having a substantially sinusoidal voltage and tuned to resonate at a frequency higher than the frequency of the voltage to improve the power factor of the rectifier.
Claim 2
Dependent Claim
84 words
An arrangement for improving power factor of a rectifier drawing power from a power source having a substantially sinusoidal voltage with an operating frequency, comprising: in combination, first inductive means and capacitive means connected in series with each other and for connection in series between a rectifier drawing power from a power source and the power source having a substantially sinusoidal voltage and tuned to resonate at a frequency higher than the frequency of the voltage to improve the power factor of the rectifier.
Claim 3
Dependent Claim
26 words
The arrangement of claim 1 wherein the inductive means consist of at least one inductor and wherein the capacitive means consist of at least one capacitor.
Claim 4
Dependent Claim
42 words
The arrangement of claim 1 wherein the capacitive means comprise: a step-up transformer having a primary winding connected in series between the rectifier and the source, and further having a secondary winding; and a capacitor connected in parallel with the secondary winding.
Claim 5
Dependent Claim
75 words
The arrangement of claim 3 wherein the transformer and the inductive means are incorporated into a single magnetic structure comprising a capacitor having one terminal connected to the source and a transformer having a tapped single folded winding one end of which winding is connected to the source and the other end of which winding is connected to the other terminal of the capacitor and the tap of which winding is connected to the rectifier.
Claim 6
Dependent Claim
31 words
The arrangement of claim 1 further comprising: second inductive means connected in series with the capacitive means and in parallel with a combination of the first inductive means and the rectifier.
Claim 7
Dependent Claim
52 words
The arrangement of claim 1 further comprising: a transformer having a winding connected in parallel with a combination of the inductive means and the rectifier and having a tap connected to the capacitive means, and a portion of the winding being connected in series between the capacitive means and the inductive means.
Claim 8
Dependent Claim
15 words
The arrangement of claim 1 wherein the resonant frequency is two times the voltage frequency.
Claim 9
Dependent Claim
63 words
The arrangement of claim 1 wherein the capacitive means have a capacitance of ##EQU4## farads ±30% and wherein the inductive means have an inductance of ##EQU5## microhenries ±30%, where PF is a desired value of the power factor, f is the frequency of the voltage in hertz, and R is an impedance of a load on the output of the rectifier in ohms.
Claim 10
Dependent Claim
124 words
An arrangement for improving power factor of a rectifier drawing power from a power source having an alternating voltage frequency, comprising: in combination, inductive means and capacitive means connected in series with each other and for connection in series between a rectifier drawing power from a power source and the source and tuned to resonate at a frequency higher than an allernating voltage frequency of said power source wherein the capacitive means have a capacitance of ##EQU6## farads ±30%, and wherein the inductive means have an inductance of ##EQU7## microhenries ±30%, where PF is a desired value of the power factor, f is the voltage frequency in hertz, and R is an impedance of a load on the output of the rectifier in ohms.
Claim 11
Dependent Claim
124 words
An arrangement for improving power factor of a rectifier drawing power from a power source having an alternating voltage frequency, comprising: in combination, inductive means and capacitive means connected in series with each other and for connection in series between a rectifier drawing power from a power source and the source and tuned to resonate at a frequency higher than an allernating voltage frequency of said power source wherein the capacitive means have a capacitance of ##EQU6## farads ±30%, and wherein the inductive means have an inductance of ##EQU7## microhenries ±30%, where PF is a desired value of the power factor, f is the voltage frequency in hertz, and R is an impedance of a load on the output of the rectifier in ohms.
Claim 12
Dependent Claim
25 words
The arrangement of claim 9 wherein the resonant frequency falls within a range of 1.4 times the voltage frequency and 3.5 times the voltage frequency.
Claim 13
Dependent Claim
82 words
A power supply comprising: means for connecting to a power source having substantially sinusoidal alternating voltage with an operating frequency; means coupled to the connecting means for rectifying the alternating voltage; and a circuit comprising inductive means and capacitve means connected in series with each other, the circuit serially interposed between the connectinng means and the rectifying means and tuned to resonate at a frequency higher than the frequency of the alternating voltage to improve the power factor of the power supply.
Claim 14
Dependent Claim
82 words
A power supply comprising: means for connecting to a power source having substantially sinusoidal alternating voltage with an operating frequency; means coupled to the connecting means for rectifying the alternating voltage; and a circuit comprising inductive means and capacitve means connected in series with each other, the circuit serially interposed between the connectinng means and the rectifying means and tuned to resonate at a frequency higher than the frequency of the alternating voltage to improve the power factor of the power supply.
Claim 15
Dependent Claim
16 words
The power supply of claim 11 wherein the resonant frequency is two times the voltage frequency.
Claim 16
Dependent Claim
15 words
The power supply of claim 11 wherein the capacitive means have a capacitance of ##EQU8##
Claim 17
Dependent Claim
50 words
farads ±30%, and wherein the inductive means have an inductance of ##EQU9## microhenries ±30%, where PF is a desired value of the power factor, f is the frequency of the voltage in hertz, and R is an impedance of a load on the output of the rectifying means in ohms.
Claim 18
Dependent Claim
50 words
farads ±30%, and wherein the inductive means have an inductance of ##EQU9## microhenries ±30%, where PF is a desired value of the power factor, f is the frequency of the voltage in hertz, and R is an impedance of a load on the output of the rectifying means in ohms.
Claim 19
Dependent Claim
129 words
A power supply comprising: means for connecting to a power source having an alternating voltage with an operating frequency; means coupled to the connecting means for rectifying the alternating voltage; and a circuit comprising inductive means and capacitive means connected in series with each other, the circuit serially interposed between the connecting means and the rectifying means and tuned to resonate at a frequency higher than the frequency of the alternating voltage wherein the capacitive means have a capacitance of ##EQU10## farads ±30%, and wherein the inductive means have an inductance of ##EQU11## microhenries ±30%, where PF is a desired value of the power factor, f is the voltage frequency in hertz, and R is an impedance of a load on the output of the rectifying means in ohms.
Claim 20
Dependent Claim
129 words
A power supply comprising: means for connecting to a power source having an alternating voltage with an operating frequency; means coupled to the connecting means for rectifying the alternating voltage; and a circuit comprising inductive means and capacitive means connected in series with each other, the circuit serially interposed between the connecting means and the rectifying means and tuned to resonate at a frequency higher than the frequency of the alternating voltage wherein the capacitive means have a capacitance of ##EQU10## farads ±30%, and wherein the inductive means have an inductance of ##EQU11## microhenries ±30%, where PF is a desired value of the power factor, f is the voltage frequency in hertz, and R is an impedance of a load on the output of the rectifying means in ohms.
Claim 21
Dependent Claim
26 words
The power supply of claim 14 wherein the resonant frequency falls within a range of 1.4 times the voltage frequency and 3.5 times the voltage frequency.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |