US3787755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifier
Assignee: ABB Training Center GmbH and Co KG
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Filing: 1973-02-14
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Granted: 1974-01-22
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Expires: 1993-02-14
Abstract
Abstract Disclosed is an electronic circuit for converting an a-c voltage into a d-c voltage. The a-c voltage is applied to a feedback amplifier incorporating a negative feedback loop having a plurality of diodes and resistances. The voltage across the diodes is used to derive a square wave signal from the amplifier, which renders a transistor switch conductive or non-conductive, depending on the polarity of the amplified signal. The amplifier output is also coupled to an RC circuit, whose capacitance is charged by alternating half-waves while the transistor switch suppresses the respective other half-waves.
Inventors
- 👤 H Goldner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:46
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
A rectifying circuit for converting an a-c voltage into a d-c voltage, comprising: a high gain amplifier with negative feedback circuit and signal input connected to receive the a-c voltage; the feedback circuit including first and second diode means connected in parallel to each other but for opposite conduction and including resistance means serially connected therewith; an electronic switch connected to said network, so that the amplifier output as well as the voltage drop across the diode means is effective on the switch; and an electric storage capacitor having a charging circuit parallel to said switch, said storage capacitor being adapted to be charged when said switch is off during half waves of one polarity.
Claim 2
Dependent Claim
115 words
A rectifying circuit for converting an a-c voltage into a d-c voltage, comprising: a high gain amplifier with negative feedback circuit and signal input connected to receive the a-c voltage; the feedback circuit including first and second diode means connected in parallel to each other but for opposite conduction and including resistance means serially connected therewith; an electronic switch connected to said network, so that the amplifier output as well as the voltage drop across the diode means is effective on the switch; and an electric storage capacitor having a charging circuit parallel to said switch, said storage capacitor being adapted to be charged when said switch is off during half waves of one polarity.
Claim 3
Dependent Claim
18 words
A circuit as in claim 1, including a blocking capacitor intermediate said storage capacitor and said diode means.
Claim 4
Dependent Claim
56 words
A circuit as in claim 1, the electronic switch being a transistor having main electrodes and control electrodes, the main electrodes being connected across the storage capacitor, the control electrode being connected to the amplifier output so that the voltage across the diode means is effective between the control electrode and one of the main electrodes.
References Cited (Backward Citations)
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |