US4555751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectified and smoothed DC supplying circuitry
Assignee: Onkyo Corp
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Filing: 1983-03-31
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Granted: 1985-11-26
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Expires: 2003-03-31
Abstract
Abstract A DC power supply circuitry comprises an AC power source transformer with its secondary winding having a center tap; a rectifier circuit; a smoothing circuit; and a bidirectional switching circuit having predetermined threshold values, interposed in between the center tap and the smoothing circuit.
Inventors
- 👤 Yoshiro Koga
- 👤 Kenji Nakao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:44
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/14; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/064
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
A rectified and smoothed DC supply circuit for use with an audio amplifier which amplifies input audio signals, said DC supply circuit comprising: a power source transformer having primary and secondary windings; a rectifying circuit for rectifying an AC output from said secondary winding of said power source transformer; a smoothing circuit consisting of positive-side and negative-side smoothing capacitors connected in series; a center-tap lead circuit of said secondary winding coupled to said smoothing circuit; a bidirectional switching circuit, having predetermined threshold values, coupling said smoothing circuit and said center-tap lead circuit, and provided for conducting charging current between said smoothing circuit and said center-tap lead circuit when the voltage at connecting points between said center-tap lead circuit and said smoothing circuit exceeds said predetermined thresholds; first and second output terminals, said first output terminal coupled between a first output terminal of said secondary winding and said positive-side smoothing capacitor, and said second output terminal coupled between a second output terminal of said secondary winding and said negative-side smoothing capacitor, said first and second output terminals being connected to said audio amplifier.
Claim 2
Dependent Claim
182 words
A rectified and smoothed DC supply circuit for use with an audio amplifier which amplifies input audio signals, said DC supply circuit comprising: a power source transformer having primary and secondary windings; a rectifying circuit for rectifying an AC output from said secondary winding of said power source transformer; a smoothing circuit consisting of positive-side and negative-side smoothing capacitors connected in series; a center-tap lead circuit of said secondary winding coupled to said smoothing circuit; a bidirectional switching circuit, having predetermined threshold values, coupling said smoothing circuit and said center-tap lead circuit, and provided for conducting charging current between said smoothing circuit and said center-tap lead circuit when the voltage at connecting points between said center-tap lead circuit and said smoothing circuit exceeds said predetermined thresholds; first and second output terminals, said first output terminal coupled between a first output terminal of said secondary winding and said positive-side smoothing capacitor, and said second output terminal coupled between a second output terminal of said secondary winding and said negative-side smoothing capacitor, said first and second output terminals being connected to said audio amplifier.
Claim 3
Dependent Claim
27 words
The circuit of claim 1, in which the bidirectional switching circuit comprises a pair of diodes oriented in opposite directions to each other and connected in parallel.
Claim 4
Dependent Claim
25 words
The circuit of claim 2, in which the bidirectional switching circuit further includes a current-limiting resistor interposed in series to the parallelly connected diode pair.
Claim 5
Dependent Claim
37 words
The circuit of claim 1, in which the bidirectional switching circuit comprises a plurality of serially connected diode pairs, each of said pairs consisting of diodes oriented in opposite directions to each other and connected in parallel.
Claim 6
Dependent Claim
53 words
The circuit of claim 1, in which the bidirectional switching circuit comprises a pair of parallelly connected segments, each said segment consisting of a plurality of serially connected diodes oriented in a direction uniform in each segment but such diode directions of the two segments being opposite one segment to the other segment.
Claim 7
Dependent Claim
136 words
The circuit of claim 1, in which the bidirectional switching circuit comprises: an electrically conducting member, dually serving also as a component of the smoothing circuit, such that one end is connected to a negative-end terminal of the positive-side smoothing capacitor, and the other end is connected to a positive-end terminal of the negative-side smoothing capacitor, a diode interposed in between the center-tap lead circuit and the negative-end terminal of the positive-side capacitor at least via the said electrically conducting member, in such orientation that the diode cathode is connected to the center-tap lead circuit, and another diode interposed in between the center-tap lead circuit and the positive-end terminal of the negative-side smoothing capacitor at least via the said electrically conducting member, in such orientation that the diode anode is connected to the center-tap lead circuit.
Claim 8
Dependent Claim
18 words
The circuit of claim 6, in which the said electrically conducting member is a bus-earth electrically conducting plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |