US4700286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated half-wave rectifier circuit
Assignee: Maxim Integrated Products Inc
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Filing: 1986-10-16
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Granted: 1987-10-13
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Expires: 2006-10-16
Abstract
Abstract An integrated off-line half-wave rectifier commonly connected to one side of the AC line at one of its output terminals is disclosed. An equivalent diode device passes current to the output during a positive AC input half cycle. A comparator senses the negative half cycle and turns on a switching device to conduct current between the two AC input terminals during that cycle.
Inventors
- 👤 David Bingham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:24
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
An off-line, current-driven, half-wave AC to DC power converter circuit, including: series-pass diode equivalent means for passing current in the direction from a first AC input terminal to a first DC output terminal; a second AC input terminal common to a second DC output terminal; comparing means for sensing when the voltage on said second AC input terminal is positive with respect to said first AC input terminal; switching means responsive to said comparing means for passing current from said second AC input terminal to said first AC input terminal when said comparing means senses that the voltage on said AC second input terminal is positive with respect to said first AC input terminal, said circuit integrated as a monolithic integrated circuit.
Claim 2
Dependent Claim
122 words
An off-line, current-driven, half-wave AC to DC power converter circuit, including: series-pass diode equivalent means for passing current in the direction from a first AC input terminal to a first DC output terminal; a second AC input terminal common to a second DC output terminal; comparing means for sensing when the voltage on said second AC input terminal is positive with respect to said first AC input terminal; switching means responsive to said comparing means for passing current from said second AC input terminal to said first AC input terminal when said comparing means senses that the voltage on said AC second input terminal is positive with respect to said first AC input terminal, said circuit integrated as a monolithic integrated circuit.
Claim 3
Dependent Claim
24 words
The off-line, current-drive, AC to DC power converter circuit of claim 1 wherein said series pass diode equivalent means is a lateral PNP transistor.
Claim 4
Dependent Claim
21 words
The off-line, current-driven, AC to DC power converter circuit of claim 1 wherein said switching means is an N-channel MOS transistor.
Claim 5
Dependent Claim
52 words
The off-line, current-driven, AC to DC power converter circuit of claim 3 further including switching means, responsive to the voltage between said first and second input terminals for selectively connecting the substrate of said N-channel MOS transistor to the one of said first and second input terminals which is the most negative.
Claim 6
Dependent Claim
74 words
The off-line, current driven, AC to DC power converter circuit of claim 1 wherein: said series pass diode equivalent means in a lateral PNP transistor, said switching means in an N-channel MOS transistor, and further including switching means responsive to the voltage between said first and second input terminals for selectively connecting the substrate of said N-channel MOS transistor to the one of said first and second input terminals which is the most negative.
Claim 7
Dependent Claim
223 words
An off-line, current-driven, AC to DC power converter circuit, including: a lateral PNP transistor having its emitter connected to a first AC input terminal, and its base and collector connected together to a first DC output terminal, a second AC input terminal common to a second DC output terminal, an N-channel MOS transistor having its source connected to said first AC input terminal, its drain connected to said second AC input terminal, and its gate terminal connected to the output of a comparator, said comparator including a first N channel MOS transistor having its source connected to said second AC input terminal, its drain and gate connected to said first DC output terminal through a first resistor, a second N channel MOS transistor, equally matched to said first N channel MOS transistor, said second N-channel MOS transistor having its source connected to said first AC input terminal, its drain connected to said first DC output terminal through a second resistor having a resistance substantially that of equal to said first resistor, and its gate connected to the gate of said first N channel MOS transistor, and a first P-channel MOS transistor having its source connected to said first DC output terminal, its drain connected to said second AC input terminal through a third resistor, the output of said comparator being its drain terminal.
Claim 8
Dependent Claim
223 words
An off-line, current-driven, AC to DC power converter circuit, including: a lateral PNP transistor having its emitter connected to a first AC input terminal, and its base and collector connected together to a first DC output terminal, a second AC input terminal common to a second DC output terminal, an N-channel MOS transistor having its source connected to said first AC input terminal, its drain connected to said second AC input terminal, and its gate terminal connected to the output of a comparator, said comparator including a first N channel MOS transistor having its source connected to said second AC input terminal, its drain and gate connected to said first DC output terminal through a first resistor, a second N channel MOS transistor, equally matched to said first N channel MOS transistor, said second N-channel MOS transistor having its source connected to said first AC input terminal, its drain connected to said first DC output terminal through a second resistor having a resistance substantially that of equal to said first resistor, and its gate connected to the gate of said first N channel MOS transistor, and a first P-channel MOS transistor having its source connected to said first DC output terminal, its drain connected to said second AC input terminal through a third resistor, the output of said comparator being its drain terminal.
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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |