EP0767529A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Switching power supply apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1996-10-02
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Granted: —
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Expires: 2016-10-02
Abstract
Abstract A direct current output voltage is switched by two switching units and a current alternately changing passing directions is supplied to a primary winding of a transformer. An alternating voltage induced in a secondary winding of the transformer is rectified and smoothed, and is applied to a control circuit. A bidirectional switching unit is connected in parallel with the primary winding, and is controlled by the control circuit so that the primary winding is short-circuited by the bidirectional switching unit and an exciting energy of the transformer is hold continuously.
Inventors
- 👤 Koji Yoshida
- 👤 Takuya Ishii
- 👤 Hiroyuki Handa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:30
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33571; H02M1/00; H02M1/0048; H02M1/0054; H02M1/0058; H02M3/01; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/1552; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A switching power supply apparatus comprising: at least two capacitors for dividing an input voltage to produce a divided voltage, a transformer having a primary winding, two switching means for switching so as to alternately applying said divided voltage to generate an alternating current output voltage and to said primary winding, and bidirectional switching means for short-circuiting said primary winding in a period of nonconductive state of said two switching means.
Claim 2
Dependent Claim
210 words
A switching power supply apparatus comprising: a serially-coupled pair of first switching means and second switching means connected across terminals of a direct current source, said first switching means and said second switching means repeating alternate turn-ON and turn-OFF, respectively, a capacitor connected at one end to one of said terminals of said direct current source, a transformer comprising a primary winding and at least one secondary winding, one end of said primary winding being connected to another end of said capacitor and the other end of said primary winding being connected to the junction between said first switching means and said second switching means, bidirectional switching means connected in parallel with said primary winding, rectifying and smoothing means operably connected to said at least one secondary winding so as to rectify and smooth output AC current from said at least one secondary winding, and control means for producing and applying control signals to said first and second switching means and said bidirectional switching means by receiving an output of said rectifying and smoothing means so that said bidirectional switching means becomes conductive in a period of nonconductive states of said first switching means and said second switching means, thereby passing a current substantially in continuity through said primary winding.
Claim 3
Dependent Claim
53 words
A switching power supply apparatus in accordance with claim 2, wherein a serially-coupled pair of a first capacitor and a second capacitor is connected across said terminals of said direct current source, and said one end of said primary winding is connected to the junction between said first capacitor and said second capacitor.
Claim 4
Dependent Claim
214 words
A switching power supply apparatus comprising: a serially-coupled pair of first switching means and second switching means connected across terminals of a direct current source, said first switching means and said second switching means repeating alternate turn-ON and turn-OFF, respectively, a capacitor connected at one end to one of said output terminals of said direct current source, a transformer comprising a primary winding, an auxiliary winding and at least one secondary winding, one end of said primary winding being connected to another end of said capacitor and the other end of said primary winding being connected to the junction between said first switching means and said second switching means, bidirectional switching means connected in parallel with said auxiliary winding, rectifying and smoothing means operably connected to said at least one secondary winding so as to rectify and smooth output AC current from said at least one secondary winding, and control means for producing and applying control signals to said first and second switching means and said bidirectional switching means by receiving an output of said rectifying and smoothing means so that said bidirectional switching means becomes conductive in a period of nonconductive states of said first switching means and said second switching means, thereby passing a current substantially in continuity through said primary winding.
Claim 5
Dependent Claim
54 words
A switching power supply apparatus in accordance with claim 4, wherein a serially-coupled pair of a first capacitor and a second capacitor is connected across said output terminal of said direct current source, and said one end of said primary winding is connected to the junction between said first capacitor and said second capacitor.
Claim 6
Dependent Claim
53 words
A switching power supply apparatus comprising: a transformer having at least two windings, at least two switching means for applying alternately an input voltage to said at least two windings, and bidirectional switching means for short-circuiting said winding of said transformer in a period of OFF-states of said at least two switching means.
Claim 7
Dependent Claim
220 words
A switching power supply apparatus comprising: a transformer having a first primary winding and a second primary winding connected at each one end thereof to one terminal of a direct current source, and at least one secondary winding, first switching means connected at one end thereof in series with said first primary winding and connected at another end thereof to the other terminal of said direct current source, and alternately repeating turn-ON and turn-OFF, second switching means connected at one end thereof in series with said second primary winding and connected at another end thereof to said other terminal of said direct current source, and turn-ON or turn-OFF alternately with said first switching means, bidirectional switching means connected between the junction of said first primary winding and said first switching means and the other junction of said second primary winding and said second switching means, rectifying and smoothing means connected to and for rectifying and smoothing a current of said secondary winding, and a control circuit, by receiving an output of said rectifying and smoothing means, for controlling said first switching means, said second switching means and said bidirectional switching means so that said bidirectional switching means becomes conductive in a period of OFF-states of both said first and second switching means, thereby continuously holding energy stored in said transformer.
Claim 8
Dependent Claim
204 words
A switching power supply apparatus comprising: a transformer having a first primary winding and a second primary winding connected at each one end thereof to one terminal of a direct current source, at least one secondary winding and an auxiliary winding, first switching means connected at one end thereof in series with said first primary winding and connected at another end thereof to the other terminal of said direct current source, and alternately repeating turn-ON and turn-OFF, second switching means connected at one end thereof in series with said second primary winding and connected at another end thereof to said other terminal of said direct current source, for repeating turn-ON and turn-OFF alternately with said first switching means, bidirectional switching means connected in parallel with said auxiliary winding, rectifying and smoothing means connected to and for rectifying and smoothing a current of said secondary winding, and a control circuit, by receiving an output of said rectifying and smoothing means, for controlling said first switching means, said second switching means and said bidirectional switching means so that said bidirectional switching means becomes conductive in a period of OFF-states of both said first and second switching means, and thereby continuously holding energy stored in said transformer.
References Cited (Backward Citations)
No citation records indexed.
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