EP0498651A2
Expired / Lapsed
EP
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High power factor power supply
Assignee: General Electric Co
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Filing: 1992-02-06
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Granted: —
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Expires: 2012-02-06
Abstract
Abstract An off-line switching power supply includes an ac rectifier and a dual-output switching converter having one output coupled between the ac rectifier and the input to the dual-output converter in order to provide a high power factor, the other output of the dual-output switching converter providing a dc voltage as the power supply output. The outputs of the dual-output converter are fully decoupled so as to allow independent control of the ac input current and the power supply output voltage. In a preferred embodiment, a full-wave ac rectifier bridge is coupled in series with the second output of the power converter via an input resonant boosting converter. A full-bridge dc-to-ac converter is coupled between the dc link and ground for providing an ac signal to excite the boosting converter and for providing another ac voltage through a transformer to an output rectifier to generate a regulated dc output voltage. The amplitude of the regulated output voltage is controlled by pulse width modulation, while active frequency control of the boosting converter is provided to control the amplitude of the ac input current. Alternatively, frequency control of the boosting converter is passive, i.e., depends on the gain characteristics of the boosting converter resonant circuit. As a result of the complete decoupling of the input boosting converter and the power supply output voltage, the off-line switching power supply is capable of drawing high quality current waveforms from the ac source while producing a regulated dc output voltage with fast transient response.
Inventors
- 👤 Robert Louis Steigerwald
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 15:13
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M7/00; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3376; H02M1/4275; Y; Y02; Y02B; Y02B70/00; Y02B70/10; Y02P; Y02P80/00; Y02P80/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
79 words
A high power factor power supply for providing a dc output voltage, comprising: ac rectifying means for providing a rectified ac voltage when coupled to an ac power line; a dual-output power converter for providing first and second output voltages, said output voltages being independently controllable, said first output voltage being coupled in series between said ac rectifying means and the input of said dual-output power converter, and said first output voltage comprising the power supply dc output voltage.
Claim 2
Dependent Claim
185 words
A power supply, comprising: ac rectifying means for providing a rectified ac voltage when coupled to an ac power line; a dual-output converter including boosting converter means and dc-to-ac converter means, said boosting converter means including a boost transformer secondary winding coupled in series between said ac rectifying means and a dc link voltage, said boosting converter means further comprising resonant circuit means including a combination of the boost transformer, a resonant inductance and a resonant capacitance, said dc-to-ac converter means receiving said dc link voltage and generating first and second ac signals, said first ac signal exciting said boosting converter means, the amplitude of the input current to said boosting converter means being dependent on the frequency of said first ac signal; output rectifier means for receiving said second ac signal and generating a regulated output dc voltage therefrom, said regulated output dc voltage being decoupled from the output voltage of said resonant circuit means; and pulse width modulation means coupled to said output rectifier means for controlling the amplitude of said regulated output dc voltage by pulse width modulating said second ac signal.
Claim 3
Dependent Claim
48 words
The power supply of claim 2, further comprising frequency modulation means for controlling the frequency of said first ac signal in a manner to cause said power converter to draw a substantially sinusoidal current from said ac power line in phase with the voltage of said power line.
Claim 4
Dependent Claim
44 words
The power supply of claim 2 wherein said boost transformer secondary winding includes a center tap, said center tap being coupled to said ac rectifying means; and said power converter further comprises a center-tapped full-wave boost rectifier coupled to said boost transformer secondary winding.
Claim 5
Dependent Claim
39 words
The power supply of claim 2, further comprising a full-wave boost rectifier comprising a parallel combination of two pairs of series-connected diodes, said boost transformer secondary winding being coupled between the junctions joining the diodes of each respective pair.
Claim 6
Dependent Claim
30 words
The power supply of claim 2 wherein said resonant capacitance is coupled in parallel with the boost transformer, and said resonant inductance is coupled in series with the boost transformer.
Claim 7
Dependent Claim
37 words
The power supply of claim 2 wherein said resonant capacitance is coupled in series with said resonant inductance, the series combination of said resonant capacitance and said resonant inductance being coupled in series with the boost transformer.
Claim 8
Dependent Claim
47 words
The power supply of claim 2 wherein; said resonant capacitance is coupled in parallel with the boost transformer; said resonant inductance is coupled in series with the boost transformer; and said resonant circuit means further includes an additional resonant capacitance coupled in series with said resonant inductance.
Claim 9
Dependent Claim
15 words
The power supply of claim 2 wherein said dc-to-ac converter means comprises a full-bridge converter.
Claim 10
Dependent Claim
105 words
A power supply, comprising: ac rectifying means for providing a rectified ac voltage when coupled to an ac power line; boosting converter means including a boost transformer secondary winding coupled in series between said ac rectifying means and a dc link voltage, said boosting converter means further comprising resonant circuit means including a combination of the boost transformer, a resonant inductance and a resonant capacitance; dc-to-ac converter means for receiving said dc link voltage and generating an ac signal for exciting said boosting converter means, the amplitude of the input current to said boosting converter means being dependent on the frequency of said ac signal.
Claim 11
Dependent Claim
47 words
The power supply of claim 10, further comprising frequency modulation means for controlling the frequency of said ac signal in a manner to cause said power converter to draw a substantially sinusoidal current from said ac power line in phase with the voltage of said power line.
Claim 12
Dependent Claim
44 words
The power supply of claim 10 wherein said boost transformer secondary winding includes a center tap, said center tap being coupled to said ac rectifying means; and said power converter further comprises a center-tapped full-wave boost rectifier coupled to said boost transformer secondary winding.
Claim 13
Dependent Claim
39 words
The power supply of claim 10, further comprising a full-wave boost rectifier comprising a parallel combination of two pairs of series-connected diodes, said boost transformer secondary winding being coupled between the junctions joining the diodes of each respective pair.
Claim 14
Dependent Claim
29 words
The powersupply of claim 10 wherein said resonant capacitance is coupled in parallel with the boost transformer, and said resonant inductance is coupled in series with the boost transformer.
Claim 15
Dependent Claim
37 words
The power supply of claim 10 wherein said resonant capacitance is coupled in series with said resonant inductance, the series combination of said resonant capacitance and said resonant inductance being coupled in series with the boost transformer.
Claim 16
Dependent Claim
47 words
The power supply of claim 10 wherein; said resonant capacitance is coupled in parallel with the boost transformer; said resonant inductance is coupled in series with the boost transformer; and said resonant circuit means further includes an additional resonant capacitance coupled in series with said resonant inductance.
Claim 17
Dependent Claim
15 words
The power supply of claim 10 wherein said dc-to-ac converter means comprises a full-bridge converter.
Claim 18
Dependent Claim
15 words
The power supply of claim 10 wherein said dc-to-ac converter means comprises a half-bridge converter.
References Cited (Backward Citations)
No citation records indexed.
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