US3885168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peak detector
Assignee: Sony Corp
•
Filing: 1973-12-26
•
Granted: 1975-05-20
•
Expires: 1993-12-26
Abstract
Abstract A first rectifying circuit has a relatively low time constant output circuit. A pulsating input voltage therefore produces an output voltage that also includes pulsations of the same periodicity. The output voltage varies in amplitude during each cycle from a peak value to a lower value. A second rectifying circuit with a larger time constant is energized by an attenuated replica of the pulsating input voltage and controls the circuit output voltage. If, due to changes in the rate or amplitude of the pulsations in the input voltage, the output voltage of the first rectifying circuit, drops below the normally lower output voltage of the second rectifying circuit, a unidirectionally conductive device transfers charge from the larger time constant circuit to the lower time constant circuit to allow the circuit output voltage to shift quickly to a lower value.
Inventors
- 👤 Atsushi Matsuzaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:22
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/44; G01; G01R; G01R19/00; G01R19/04; G11B15/43; G11B15/46; G11B15/48; G11B15/54; H; H03; H03D; H03D3/00; H03D3/02; H03D3/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A circuit to respond to peak values of an applied pulsating voltage, said circuit comprising: A. a first rectifier; B. a first time constant circuit connected in series with said first rectifier to receive the pulsating voltage; C. a second rectifier; D. a second time constant circuit having a larger time constant than said first time constant circuit and being connected in series with said second rectifier to a source of a lower amplitude of said voltage; and E. a transistor having a collector electrode connected to said first time constant circuit and a base electrode connected to said second time constant circuit for connecting said second time constant circuit to said first time constant circuit via the collector-base circuit of said transistor said transistor further including an emitter electrode connected to an output terminal and being further connected through an emitter impedance such that said transistor is operable as an emitterfollower.
Claim 2
Dependent Claim
152 words
A circuit to respond to peak values of an applied pulsating voltage, said circuit comprising: A. a first rectifier; B. a first time constant circuit connected in series with said first rectifier to receive the pulsating voltage; C. a second rectifier; D. a second time constant circuit having a larger time constant than said first time constant circuit and being connected in series with said second rectifier to a source of a lower amplitude of said voltage; and E. a transistor having a collector electrode connected to said first time constant circuit and a base electrode connected to said second time constant circuit for connecting said second time constant circuit to said first time constant circuit via the collector-base circuit of said transistor said transistor further including an emitter electrode connected to an output terminal and being further connected through an emitter impedance such that said transistor is operable as an emitterfollower.
Claim 3
Dependent Claim
42 words
The circuit of claim 1, in which the time constant of said second time constant circuit maintains the voltage thereacross substantially constant when the voltage across said first time constant circuit is higher than said voltage across said second time constant circuit.
Claim 4
Dependent Claim
32 words
The circuit of claim 1, in which the time constant of said first time constant circuit is low enough to permit substantial variation of voltage thereacross between pulsations of the applied voltage.
Claim 5
Dependent Claim
31 words
The circuit of claim 1, in which said source of lower amplitude of said voltage comprises a voltage divider connected across input terminals of said first rectifier and time constant circuit.
References Cited (Backward Citations)
US3535658A
Cited
US3617777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |