Patent US5673184A successfully refreshed from Google Patents.
US5673184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch mode power supply circuit with increased power factor for mains
Assignee: Deutsche Thomson Brandt GmbH
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Filing: 1995-05-31
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Granted: 1997-09-30
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Expires: 2015-05-31
Abstract
Abstract Switch mode power supplies produce a brief pulse-like load on the mains and have a high harmonic content. Such a high harmonic load on the mains is undesirable. There are increasingly strict regulations for the level of harmonic loads connected to the mains. The present switch mode power supply includes a series circuit formed by an inductor and a diode connected between a charge capacitor, which is dimensioned to be relatively small, and a pickoff of a primary winding of a transformer of the switch mode power supply. A relatively large energy storage capacitor connected to the primary winding is decoupled from the charge capacitor by a second diode. The series circuit produces an additional charging current, which extends the current which is drawn from the mains during one half cycle of the mains voltage, and reduces the amplitude of the current.
Inventors
- 👤 Gerard Rilly
- 👤 Jose I. Rodriguez Duran
- 👤 Harald Roth
- 👤 Gerard Morizot
- 👤 Thomas Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:01
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4258; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A switch mode power supply with a reduced harmonic load on mains, comprising: a mains rectifier, an output of the mains rectifier being coupled to a charge capacitor and to a series circuit, the series circuit comprising: a diode, a primary winding of a transformer, a switching transistor, and an energy storage capacitor coupled in parallel with said primary winding and said switching transistor, with the voltage thereacross being a smoothed DC voltage, the charge capacitor being further coupled to a tap of said primary winding via a second series circuit comprising an inductor and a diode.
Claim 2
Dependent Claim
97 words
A switch mode power supply with a reduced harmonic load on mains, comprising: a mains rectifier, an output of the mains rectifier being coupled to a charge capacitor and to a series circuit, the series circuit comprising: a diode, a primary winding of a transformer, a switching transistor, and an energy storage capacitor coupled in parallel with said primary winding and said switching transistor, with the voltage thereacross being a smoothed DC voltage, the charge capacitor being further coupled to a tap of said primary winding via a second series circuit comprising an inductor and a diode.
Claim 3
Dependent Claim
19 words
The power supply as claimed in claim 1, wherein said tap is a middle tap of said primary winding.
Claim 4
Dependent Claim
48 words
The power supply as claimed in claim 2, wherein a winding ratio between a winding part between said tap and the switching transistor, and a winding part between said tap and an end of the primary winding which is connected to the energy storage capacitor, is about 2:1.
Claim 5
Dependent Claim
43 words
The power supply as claimed in claim 1, wherein said tap of the primary winding is formed by one end of an additional winding of said transformer, the other end of the additional winding being coupled to one end of the primary winding.
Claim 6
Dependent Claim
19 words
The power supply as claimed in claim 4, wherein said additional winding comprises a plurality of parallel-connected additional windings.
Claim 7
Dependent Claim
38 words
The power supply as claimed in claim 5, wherein said main winding is split into a plurality of winding parts which are located in separate chambers of a coil former and are coupled together with an additional winding.
Claim 8
Dependent Claim
84 words
A switch mode power supply with a reduced harmonic load on mains, comprising: a mains rectifier, an output of the mains rectifier being coupled to a charge capacitor and to a switching transistor via a series circuit, the series circuit comprising a first inductance and a diode, the switching transistor being coupled via a second inductance to a filter capacitor which provides an operating voltage, the first inductance being coupled in series with the second inductance and being magnetically coupled to the second inductance.
Claim 9
Dependent Claim
84 words
A switch mode power supply with a reduced harmonic load on mains, comprising: a mains rectifier, an output of the mains rectifier being coupled to a charge capacitor and to a switching transistor via a series circuit, the series circuit comprising a first inductance and a diode, the switching transistor being coupled via a second inductance to a filter capacitor which provides an operating voltage, the first inductance being coupled in series with the second inductance and being magnetically coupled to the second inductance.
Claim 10
Dependent Claim
28 words
The power supply as claimed in claim 7, wherein the second inductance is formed by a secondary winding of a transformer whose primary winding forms the first inductance.
Claim 11
Dependent Claim
52 words
The power supply as claimed in claim 7, wherein said output of the mains rectifier is coupled via a second series circuit formed by a third inductance, to the first inductance, the diode, a collector/emitter path of said transistor, and the second inductance to the filter capacitor, which supplies an operating voltage.
Claim 12
Dependent Claim
20 words
The power supply as claimed in claim 9, wherein the load supplied by the power supply is a fluorescent tube.
Claim 13
Dependent Claim
28 words
The power supply as claimed in claim 8, wherein a winding ratio of the primary winding with respect to the secondary winding of the transformer is approximately 2:1.
Claim 14
Dependent Claim
21 words
The power supply as claimed in claim 9, wherein the third inductance is formed by stray inductance of the secondary winding.
Claim 15
Dependent Claim
25 words
The power supply as claimed in claim 11, wherein the primary winding and the secondary winding are located in two chambers of a coil former.
Claim 16
Dependent Claim
32 words
The power supply as claimed in claim 13, wherein the two chambers are spaced apart from one another in the axial direction by means of an intermediate space which is without windings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-29 | 2001-03-31 | 2001-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-29 | 2005-03-31 | 2005-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-29 | 2009-03-31 | 2009-09-30 | $7700.00 | Window Closed / Lapsed |