US4211940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic power control device
Assignee: Panasonic Holdings Corp
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Filing: 1978-04-20
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Granted: 1980-07-08
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Expires: 1998-04-20
Abstract
Abstract An electronic power control device including two R-S flip-flops, two diodes, an analog memory consisting of a MOS field-effect transistor, a nonpolarized capacitor and an analog switch, and a firing circuit interconnected between the ground and a trapezoidal waveform power level source, whereby a power delivered to a load may be stepped up or down instantaneously or may be maintained constant. When the load is an incandescent lamp, the latter may be instantaneously turned on or off by a simple "push-on" of a switch.
Inventors
- 👤 Shunji Minami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:41
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
293 words
An electronic power control device, comprising: (a) a first R-S flip-flop with a set input terminal connected through an UP switch to a DC power source and a reset input terminal connected through a DOWN switch to said DC power source, (b) a second R-S flip-flop with a set input terminal connected through first and second diodes to said set and reset input terminals of said first R-S flip-flop and a reset input terminal connected through a STOP switch to said DC power source, (c) an analog memory comprising an input resistor with one end connected to an output terminal of said first R-S flip-flop, an analog switch one end of which is connected to the other end of said input resistor and which is enabled or disabled in response to the output from said second R-S flip-flop, a nonpolarized capacitor interconnected between the other end of said analog switch and the ground, and a MOS field-effect transistor with the gate connected to said other end of said analog switch, the drain connected to A DC power source and the source connected to an output terminal and connected to a source of reference potential through an output resistor, (d) a firing circuit coupled to said analog memory output terminal and connected in series with a control resistor and a firing capacitor, and means for interconnecting said firing circuit between a source of reference potential and a generally trapezoidal waveform power source in such a way that said firing circuit may be fired or rendered conductive in response to a predetermined level of voltage charged across said firing capacitor, and (e) a semiconductor device for controlling the level of voltage charged across said firing capacitor in response to the output from said analog memory.
Claim 2
Dependent Claim
293 words
An electronic power control device, comprising: (a) a first R-S flip-flop with a set input terminal connected through an UP switch to a DC power source and a reset input terminal connected through a DOWN switch to said DC power source, (b) a second R-S flip-flop with a set input terminal connected through first and second diodes to said set and reset input terminals of said first R-S flip-flop and a reset input terminal connected through a STOP switch to said DC power source, (c) an analog memory comprising an input resistor with one end connected to an output terminal of said first R-S flip-flop, an analog switch one end of which is connected to the other end of said input resistor and which is enabled or disabled in response to the output from said second R-S flip-flop, a nonpolarized capacitor interconnected between the other end of said analog switch and the ground, and a MOS field-effect transistor with the gate connected to said other end of said analog switch, the drain connected to A DC power source and the source connected to an output terminal and connected to a source of reference potential through an output resistor, (d) a firing circuit coupled to said analog memory output terminal and connected in series with a control resistor and a firing capacitor, and means for interconnecting said firing circuit between a source of reference potential and a generally trapezoidal waveform power source in such a way that said firing circuit may be fired or rendered conductive in response to a predetermined level of voltage charged across said firing capacitor, and (e) a semiconductor device for controlling the level of voltage charged across said firing capacitor in response to the output from said analog memory.
Claim 3
Dependent Claim
65 words
An electronic power control device as set forth in claim 1 wherein a second analog switch is connected in parallel with a timing resistor, which determines a charging time of said analog memory, in such a way that said second analog switch may be closed at the instant when a second set input or a second reset input is applied to said second R-S flip-flop.
Claim 4
Dependent Claim
23 words
An electronic power control device as set forth in claim 1 or 2 wherein said first analog switch consists of a reed relay.
Claim 5
Dependent Claim
22 words
An electronic power control device as set forth in claim 1 or 2 wherein said analog switch consists of a semiconductor switch.
References Cited (Backward Citations)
US4032838A
Cited
US3988596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |