US5475580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply circuit
Assignee: Yamaha Corp
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Filing: 1994-07-28
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Granted: 1995-12-12
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Expires: 2014-07-28
Abstract
Abstract A power supply circuit of a switching inverter type includes a switching circuit including two switching elements capable of being alternately on-off controlled for converting an input from a dc power source into ac by switching of the switching elements and outputting it, a dc output circuit for full-wave rectifying and smoothing a supplied ac input to provide a dc output, a series resonance circuit provided in series to current flowing from the output terminal of the switching circuit, a parallel resonance circuit provided in parallel to voltage produced at the output terminal of the switching circuit, and a switching control circuit for intermittently turning on the switching elements of the switching circuit. A dc output is taken out of resonance current of the series resonance circuit by the dc output circuit and potential at the output terminal of the switching circuit is converted from one potential to another by using parallel resonance voltage of the parallel resonance circuit, whereby all switching operations of the switching elements are performed substantially at a voltage zero state or substantially at a current zero state and harmonic contents in operation voltage and operation current in the circuit are reduced.
Inventors
- 👤 Masao Noro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:33
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387; H02M3/01; H02M3/33569; H02M3/33571; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
247 words
A power supply circuit comprising: a dc power source; switching means including switching elements capable of switching an output from the dc power source to convert the input to ac and outputting ac from an output terminal thereof, the ac changing between two different potentials; series resonance means provided in series to current flowing from the output terminal of the switching means, the series resonance means being capable of generating resonance current; parallel resonance means provided in parallel to voltage produced at the output terminal of the switching means, the parallel resonance means being capable of generating resonance voltage and potential at the output terminal of the switching means being converted from one of the two different potentials to the other by using the parallel resonance voltage of the parallel resonance means; switching control means for controlling the switching elements of the switching means so as to intermittently turn on the switching elements at a constant frequency and independent of a load applied to said circuit; and dc output means for full-wave rectifying and smoothing a supplied ac input, the dc output means being capable of taking out a dc output from the resonance current of the series resonance means, wherein all switching operations of the switching elements of the switching means are performed with a constant period substantially at a voltage zero state or substantially at a current zero state, whereby harmonic contents in operation voltage and operation current in the power supply circuit are reduced.
Claim 2
Dependent Claim
247 words
A power supply circuit comprising: a dc power source; switching means including switching elements capable of switching an output from the dc power source to convert the input to ac and outputting ac from an output terminal thereof, the ac changing between two different potentials; series resonance means provided in series to current flowing from the output terminal of the switching means, the series resonance means being capable of generating resonance current; parallel resonance means provided in parallel to voltage produced at the output terminal of the switching means, the parallel resonance means being capable of generating resonance voltage and potential at the output terminal of the switching means being converted from one of the two different potentials to the other by using the parallel resonance voltage of the parallel resonance means; switching control means for controlling the switching elements of the switching means so as to intermittently turn on the switching elements at a constant frequency and independent of a load applied to said circuit; and dc output means for full-wave rectifying and smoothing a supplied ac input, the dc output means being capable of taking out a dc output from the resonance current of the series resonance means, wherein all switching operations of the switching elements of the switching means are performed with a constant period substantially at a voltage zero state or substantially at a current zero state, whereby harmonic contents in operation voltage and operation current in the power supply circuit are reduced.
Claim 3
Dependent Claim
183 words
A power supply circuit comprising: a dc power source; switching means including switching elements capable of switching an input from the dc power source to convert the input to ac and providing converted input as an ac output from an output terminal thereof; series resonance means provided in series to current flowing from the output terminal of the switching means, the series resonance means being capable of generating resonance current; parallel resonance means provided in parallel to voltage produced at the output terminal of the switching means, the parallel resonance means being capable of generating resonance voltage; dc output means for full-wave rectifying and smoothing a supplied ac input to provide a dc output; and switching control means for controlling the switching elements of the switching means, so that the switching elements are alternately turned on with a constant period and a constant frequency independent of a load applied to said circuit, said switching elements being turned on when the resonance voltage is substantially zero and turned off when the resonance current is substantially zero at the output terminal of the switching means.
Claim 4
Dependent Claim
183 words
A power supply circuit comprising: a dc power source; switching means including switching elements capable of switching an input from the dc power source to convert the input to ac and providing converted input as an ac output from an output terminal thereof; series resonance means provided in series to current flowing from the output terminal of the switching means, the series resonance means being capable of generating resonance current; parallel resonance means provided in parallel to voltage produced at the output terminal of the switching means, the parallel resonance means being capable of generating resonance voltage; dc output means for full-wave rectifying and smoothing a supplied ac input to provide a dc output; and switching control means for controlling the switching elements of the switching means, so that the switching elements are alternately turned on with a constant period and a constant frequency independent of a load applied to said circuit, said switching elements being turned on when the resonance voltage is substantially zero and turned off when the resonance current is substantially zero at the output terminal of the switching means.
Claim 5
Dependent Claim
20 words
A power supply circuit as defined in claim 1 wherein said dc output means comprises a diode and a capacitor.
Claim 6
Dependent Claim
17 words
A power supply circuit as defined in claim 1 wherein said switching means has two switching elements.
Claim 7
Dependent Claim
24 words
A power supply circuit as defined in claim 1 which further comprises a transformer provided in a prior stage of the dc output means.
Claim 8
Dependent Claim
20 words
A power supply circuit as defined in claim 5 wherein said transformer comprises a primary winding and a secondary winding.
Claim 9
Dependent Claim
30 words
A power supply circuit as defined in claim 6 wherein said parallel resonance means comprises inductance and capacitance and self inductance of the primary winding is used as said inductance.
Claim 10
Dependent Claim
30 words
A power supply circuit as defined in claim 6 wherein said series resonance means comprises inductance and capacitance and leakage inductance of the primary winding is used as said inductance.
Claim 11
Dependent Claim
74 words
A power supply circuit as defined in claim 1 wherein said series resonance means and said parallel resonance means respectively comprises inductance and capacitance and the inductance of said series resonance means is set at a value which is much smaller than the inductance of the parallel resonance means and the capacitance of said series resonance means is set at a value which is much larger than the capacitance of said parallel resonance means.
Claim 12
Dependent Claim
19 words
A power supply circuit as defined in claim 2, further comprising time constant means for controlling said constant period.
Claim 13
Dependent Claim
31 words
A power supply circuit as defined in claim 10, further comprising starting means for starting operation of said switching means upon initial application of said input from the dc power source.
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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) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |