Patent US4725938A successfully refreshed from Google Patents.
US4725938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage resonant DC/DC converter
Assignee: Toshiba Corp
•
Filing: 1986-09-29
•
Granted: 1988-02-16
•
Expires: 2006-09-29
Abstract
Abstract A high voltage DC/DC converter including a voltage resonance switching circuit formed by a coreless transformer, a GTO thyristor switching element connected between the primary winding of the transformer and a D.C. source, and a voltage resonance capacitor connected in parallel to the switching element. A rectifier circuit is connected to the secondary winding of the transformer to rectify an output current from the transformer circuit. The resonance frequency of the parallel resonance circuit made of the resonance capacitor and the coreless transformer is selected to be the frequency of that component of the current supplied to the circuit through the switching element, which has a greater amplitude than any other component of the current (including the fundamental frequency and other harmonic).
Inventors
- 👤 Toshihiro Onodera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:41
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/10; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H05; H05G; H05G1/00; H05G1/02; H05G1/08; H05G1/10; H05G1/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
172 words
A high voltage resonant DC/DC converter comprising: a coreless transformer having primary and secondary windings; first switching means connected in series between a DC power source and the primary winding of said transformer for selectively connecting said DC power source to said primary winding; switch driving means connected to said first switching means for rendering said first switching means periodically conductive and nonconductive at a predetermined high frequency; a voltage resonance capacitor connected in parallel with said first switching means; and a rectifier circuit connected to the secondary winding of said transformer for rectifying an output current from the secondary winding of said transformer and for supplying the rectified current to a load; wherein said voltage resonance capacitor and said coreless transformer constitute a parallel resonance circuit having a voltage resonant frequency selected close to the frequency of that component of the current supplied to said resonance circuit through said first switching means, which has a greater amplitude than any other component of the current including the fundamental frequency and other harmonics.
Claim 2
Dependent Claim
172 words
A high voltage resonant DC/DC converter comprising: a coreless transformer having primary and secondary windings; first switching means connected in series between a DC power source and the primary winding of said transformer for selectively connecting said DC power source to said primary winding; switch driving means connected to said first switching means for rendering said first switching means periodically conductive and nonconductive at a predetermined high frequency; a voltage resonance capacitor connected in parallel with said first switching means; and a rectifier circuit connected to the secondary winding of said transformer for rectifying an output current from the secondary winding of said transformer and for supplying the rectified current to a load; wherein said voltage resonance capacitor and said coreless transformer constitute a parallel resonance circuit having a voltage resonant frequency selected close to the frequency of that component of the current supplied to said resonance circuit through said first switching means, which has a greater amplitude than any other component of the current including the fundamental frequency and other harmonics.
Claim 3
Dependent Claim
26 words
The converter according to claim 1, wherein said switch driving means comprises pulse generating means for supplying predetermined high frequency pulses to said first switching means.
Claim 4
Dependent Claim
16 words
The converter according to claim 1, wherein the secondary winding comprises a plurality of divided windings.
Claim 5
Dependent Claim
77 words
The converter according to claim 3, wherein said rectifier circuit comprises a plurality of groups of diodes respectively connected in series, every two diode groups being connected in parallel and comprising the same number of said diodes, and each of the divided secondary windings being connected between a junction of two adjacent diodes of one diode group and a junction of two corresponding adjacent diodes of another diode group connected in parallel with said one diode group.
Claim 6
Dependent Claim
60 words
The converter according to claim 1, further comprising: second switching means connected in series between said first switching means and the primary winding of said transformer for controlling the connection of said DC power source to said transformer primary winding; and second switch driving means for controlling the second switching means to be conductive and nonconductive with a variable timing.
Claim 7
Dependent Claim
20 words
The converter according to claim 1, wherein said first switching means comprises a semiconductor switching element acting as a diode.
Claim 8
Dependent Claim
23 words
The converter according to claim 6, further comrising a by-pass diode connected with opposite polarity in parallel with said first semiconductor switching element.
Claim 9
Dependent Claim
17 words
The converter according to claim 6, wherein said first semiconductor switch element comprises a gate turn-off thyristor.
Claim 10
Dependent Claim
168 words
A high voltage resonance DC/DC converter comprising: a coreless transformer having primary and secondary windings; first switching means connected in series between the primary winding and a DC power source for selectively connecting said DC power source to said primary winding; switch driving means connected to said first switching means for rendering said first switching means periodically conductive and nonconductive at a predetermined high frequency; a voltage resonance capacitor connected in parallel with the primary winding of said transformer; and a rectifier circuit connected to the secondary winding of said transformer for rectifying an output current from said secondary winding and for supplying the recitified current to a load; wherein said voltage resonance capacitor and said coreless transformer constitute a parallel resonance circuit having a voltage resonant frequency selected close to the frequency of that component of the current supplied to said resonance circuit through said first switching means, which has a greater amplitude than any other component of the current including the fundamental frequency and other harmonics.
Claim 11
Dependent Claim
168 words
A high voltage resonance DC/DC converter comprising: a coreless transformer having primary and secondary windings; first switching means connected in series between the primary winding and a DC power source for selectively connecting said DC power source to said primary winding; switch driving means connected to said first switching means for rendering said first switching means periodically conductive and nonconductive at a predetermined high frequency; a voltage resonance capacitor connected in parallel with the primary winding of said transformer; and a rectifier circuit connected to the secondary winding of said transformer for rectifying an output current from said secondary winding and for supplying the recitified current to a load; wherein said voltage resonance capacitor and said coreless transformer constitute a parallel resonance circuit having a voltage resonant frequency selected close to the frequency of that component of the current supplied to said resonance circuit through said first switching means, which has a greater amplitude than any other component of the current including the fundamental frequency and other harmonics.
Claim 12
Dependent Claim
26 words
The converter according to claim 9, wherein said switch driving means comprises pulse generating means for supplying predetermined high frequency pulses to said first switching means.
Claim 13
Dependent Claim
16 words
The converter according to claim 9, wherein the secondary winding comprises a plurality of divided windings.
Claim 14
Dependent Claim
77 words
The converter according to claim 11, wherein said rectifier circuit comprising a plurality of groups of diodes respectively connected in series, every two diode groups being connected in parallel and comprising the same number of said diodes, and each of the divided secondary windings being connected between a junction of two adjacent diodes of one diode group and a junction of two corresponding adjacent diodes of another diode group connected in parallel with said one diode group.
Claim 15
Dependent Claim
60 words
The converter according to claim 9, further comprising: second switching means connected in series between said first switching means and the primary winding of said transformer for controlling the connection of said D.C. power source to said transformer primary winding; and second switch driving means for controlling the second switching means to be conductive and nonconductive with a variable timing.
Claim 16
Dependent Claim
20 words
The converter according to claim 9, wherein said first switching means comprises a semiconductor switching element acting as a diode.
Claim 17
Dependent Claim
23 words
The converter according to claim 14, further comprising a by-pass diode connected with opposite polarity in parallel with said first semiconductor switching element.
Claim 18
Dependent Claim
17 words
The converter according to claim 14, wherein said first semiconductor switch element comprises a gate turn-off thyristor.
References Cited (Backward Citations)
US3197691A
Cited
US3419786A
Cited
US4318164A
Cited
US4383292A
Cited
US4339704A
Cited
US4386395A
Cited
EP0058399A2
Cited
US4366532A
Cited
EP0106482A1
Cited
US4480298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |