US4356541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifier
Assignee: Tohoku Ricoh Co Ltd
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Filing: 1980-12-16
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Granted: 1982-10-26
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Expires: 2000-12-16
Abstract
Abstract A rectifier in which a semiconductor active element, which is a rectifying element, and a diode are connected in parallel in the same direction so that the degradation in rectifying efficiency due to the delay in rise time of voltage when the active element is turned on can be avoided.
Inventors
- 👤 Tsuneo Ikenoue
- 👤 Shin-Yng Liu
- 👤 Shuichi Umemoto
- 👤 Naoki Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:30
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33576; H02M3/33592; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A rectifier for an AC input voltage, comprising: a parallel combination circuit of a semiconductor active rectifying element having a control terminal and a diode, said active element and said diode being connected in parallel in the same conduction direction; a terminal voltage comparator coupled to said parallel combination circuit for comparing the input voltage with the output voltage of said parallel combination; and a pulse control circuit comprising a master control pulse generator coupled to said terminal voltage comparator, an operational circuit and a drive circuit coupled to the control terminal of said semiconductor active element for controlling the same in response to the output from said master control pulse generator.
Claim 2
Dependent Claim
112 words
A rectifier for an AC input voltage, comprising: a parallel combination circuit of a semiconductor active rectifying element having a control terminal and a diode, said active element and said diode being connected in parallel in the same conduction direction; a terminal voltage comparator coupled to said parallel combination circuit for comparing the input voltage with the output voltage of said parallel combination; and a pulse control circuit comprising a master control pulse generator coupled to said terminal voltage comparator, an operational circuit and a drive circuit coupled to the control terminal of said semiconductor active element for controlling the same in response to the output from said master control pulse generator.
Claim 3
Dependent Claim
194 words
A rectifier for an AC input voltage, comprising: a parallel combination circuit of a semiconductor active rectifying element having a control terminal and a diode, said active element and said diode being connected in parallel in the same conduction direction; a terminal voltage comparator coupled to said parallel combination circuit for comparing the input voltage with the output voltage of said parallel combination; and a pulse control circuit comprising a master control pulse generator coupled to said terminal voltage comparator, an operational circuit and a drive circuit coupled to the control terminal of said semiconductor active element for controlling the same in response to the output from said master control pulse generator, said pulse control circuit being so designed and constructed that when said terminal voltage comparator detects the time at which the rising input voltage to said parallel combination circuit becomes equal to the rectified output voltage thereof, said pulse control circuit causes said semiconductor active element to turn on, and when said terminal voltage comparator detects the time at which the falling input voltage becomes equal to the output voltage, said pulse control circuit causes said semiconductor active element to turn off.
Claim 4
Dependent Claim
194 words
A rectifier for an AC input voltage, comprising: a parallel combination circuit of a semiconductor active rectifying element having a control terminal and a diode, said active element and said diode being connected in parallel in the same conduction direction; a terminal voltage comparator coupled to said parallel combination circuit for comparing the input voltage with the output voltage of said parallel combination; and a pulse control circuit comprising a master control pulse generator coupled to said terminal voltage comparator, an operational circuit and a drive circuit coupled to the control terminal of said semiconductor active element for controlling the same in response to the output from said master control pulse generator, said pulse control circuit being so designed and constructed that when said terminal voltage comparator detects the time at which the rising input voltage to said parallel combination circuit becomes equal to the rectified output voltage thereof, said pulse control circuit causes said semiconductor active element to turn on, and when said terminal voltage comparator detects the time at which the falling input voltage becomes equal to the output voltage, said pulse control circuit causes said semiconductor active element to turn off.
Claim 5
Dependent Claim
248 words
A rectifier for an AC input voltage, said rectifier being coupled to the secondary coil of a main transformer of a transformer isolation type DC-DC converter, said main transformer also having a primary coil, comprising: a parallel combination circuit of a semiconductor active rectifying element having a control terminal and a diode, said active element and said diode being connected in parallel in the same conduction direction; a terminal voltage comparator coupled to said parallel combination circuit for comparing the input voltage with the output voltage of said parallel combination; a pulse control circuit comprising a master control pulse generator coupled to said terminal voltage comparator, an operational circuit and a drive circuit coupled to the control terminal of said semiconductor active element for controlling the same in response to the output from said master control pulse generator, said pulse control circuit being so designed and constructed that when said terminal voltage comparator detects the time at which the rising input voltage to said parallel combination circuit becomes equal to the rectified output voltage thereof, said pulse control circuit causes said semiconductor active element to turn on; a main switching transistor coupled to the primary coil of said main transformer of said DC-DC converter; and means responsive to the output pulses of said master control pulse generator for driving said main switching transistor so as to cause said semiconductor active element to turn off in a time interval shorter than the trailing edge of each of said pulses.
Claim 6
Dependent Claim
248 words
A rectifier for an AC input voltage, said rectifier being coupled to the secondary coil of a main transformer of a transformer isolation type DC-DC converter, said main transformer also having a primary coil, comprising: a parallel combination circuit of a semiconductor active rectifying element having a control terminal and a diode, said active element and said diode being connected in parallel in the same conduction direction; a terminal voltage comparator coupled to said parallel combination circuit for comparing the input voltage with the output voltage of said parallel combination; a pulse control circuit comprising a master control pulse generator coupled to said terminal voltage comparator, an operational circuit and a drive circuit coupled to the control terminal of said semiconductor active element for controlling the same in response to the output from said master control pulse generator, said pulse control circuit being so designed and constructed that when said terminal voltage comparator detects the time at which the rising input voltage to said parallel combination circuit becomes equal to the rectified output voltage thereof, said pulse control circuit causes said semiconductor active element to turn on; a main switching transistor coupled to the primary coil of said main transformer of said DC-DC converter; and means responsive to the output pulses of said master control pulse generator for driving said main switching transistor so as to cause said semiconductor active element to turn off in a time interval shorter than the trailing edge of each of said pulses.
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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |