US4991075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-switching loss DC-DC converter
Assignee: Mitsubishi Electric Corp
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Filing: 1990-02-06
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Granted: 1991-02-05
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Expires: 2010-02-06
Abstract
Abstract A DC-DC converter comprises a switching element having a rise time t on and a fall time t off ; a control device for controlling the switching operation of the switching element; a transformer having a primary winding and a secondary winding, the primary winding being connected to a DC power source through the switching element, and having an open inductance L M ; an inductance coil having an inductance L connected to the secondary winding of the transformer; and a rectifying device for rectifying the output from the secondary winding of the transformer; assuming that the voltage applied to the primary winding of the transformer is E, the load current flowing through the transformer is I D , and the sum of the stray capacitance of the switching element and the distributed capacity of the windings of the transformer is C1, the following relational expressions being established: L>(E/I.sub.D)T.sub.on and L.sub.M >t.sub.off.sup.2 /π.sup.2 Cl
Inventors
- 👤 Akira Saitou
- 👤 Osamu Takahashi
- 👤 Seigou Tsukada
- 👤 Yasuyuki Sohara
- 👤 Hideki Tsuruse
- 👤 Hidehiko Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:31
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33538
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A DC--DC converter comprising: a switching element having a rise time t on and a fall time t off ; a control means for controlling the switching operation of said switching element; a transformer having a primary winding and a secondary winding, said primary winding being connected to a DC power source through said switching element, and having an open inductance L M ; an inductance means having an inductance L connected to said secondary winding of said transformer; and a rectifying means for rectifying the output from said secondary winding of said transformer; assuming that the voltage applied to said primary winding of said transformer is E, the load current flowing through said transformer is I D , and the sum of the stray capacitance of said switching element and the distributed capacity of said windings of said transformer is C1, the following relational expressions being established: L>(E/I.sub.D) t.sub.on and L.sub.M >4 t.sub.off.sup.2 /π.sup.2 C1.
Claim 2
Dependent Claim
156 words
A DC--DC converter comprising: a switching element having a rise time t on and a fall time t off ; a control means for controlling the switching operation of said switching element; a transformer having a primary winding and a secondary winding, said primary winding being connected to a DC power source through said switching element, and having an open inductance L M ; an inductance means having an inductance L connected to said secondary winding of said transformer; and a rectifying means for rectifying the output from said secondary winding of said transformer; assuming that the voltage applied to said primary winding of said transformer is E, the load current flowing through said transformer is I D , and the sum of the stray capacitance of said switching element and the distributed capacity of said windings of said transformer is C1, the following relational expressions being established: L>(E/I.sub.D) t.sub.on and L.sub.M >4 t.sub.off.sup.2 /π.sup.2 C1.
Claim 3
Dependent Claim
21 words
A converter according to claim 1, wherein said inductance means includes an inductor connected to said secondary winding of said transformer.
Claim 4
Dependent Claim
17 words
A converter according to claim 1, wherein said inductance means comprises the leakage inductance of said transformer.
Claim 5
Dependent Claim
173 words
A DC--DC converter comprising: a switching element having a rise time t on and a fall time t off ; a control means for controlling the switching operation of said switching element; a transformer having a primary winding and a secondary winding, said primary winding being connected to a DC power source through said switching element, and having an open inductance L M ; an inductance means having an inductance L connected to said secondary winding of said transformer; and a rectifying means for rectifying the output from said secondary winding of said transformer; assuming that the voltage applied to said primary winding of said transformer is E, the load current flowing through said transformer is I D , the maximum time said switching element is turned off is t max , and the sum of the stray capacitance of said switching element and the distributed capacity of said windings of said transformer is C1, the following relational expressions being established: L>(E/I.sub.D) t.sub.on and .sup.4· toff.sup.2 /π.sup.2 ·C1<L.sub.M 21 .sup.t max.sup.2 /π.sup.2 ·C1
Claim 6
Dependent Claim
173 words
A DC--DC converter comprising: a switching element having a rise time t on and a fall time t off ; a control means for controlling the switching operation of said switching element; a transformer having a primary winding and a secondary winding, said primary winding being connected to a DC power source through said switching element, and having an open inductance L M ; an inductance means having an inductance L connected to said secondary winding of said transformer; and a rectifying means for rectifying the output from said secondary winding of said transformer; assuming that the voltage applied to said primary winding of said transformer is E, the load current flowing through said transformer is I D , the maximum time said switching element is turned off is t max , and the sum of the stray capacitance of said switching element and the distributed capacity of said windings of said transformer is C1, the following relational expressions being established: L>(E/I.sub.D) t.sub.on and .sup.4· toff.sup.2 /π.sup.2 ·C1<L.sub.M 21 .sup.t max.sup.2 /π.sup.2 ·C1
Claim 7
Dependent Claim
21 words
A converter according to claim 4, wherein said inductance means includes an inductor connected to said secondary winding of said transformer.
Claim 8
Dependent Claim
17 words
A converter according to claim 4, wherein said inductance means comprises the leakage inductance of said transformer.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |