US3870905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit
Assignee: Sony Corp
•
Filing: 1972-10-13
•
Granted: 1975-03-11
•
Expires: 1992-10-13
Abstract
Abstract In a switching circuit for connecting a d.c. source to a load such as an amplifier or the like, a transistor is interconnected between the source and the load and the base of the transistor is biased by a circuit including a switch and a resistor connected from the source to the base, and a capacitor connected from the base to ground, so that the voltage at the load increases gradually after the switch is closed.
Inventors
- 👤 Hiroyuki Chikazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:37
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/16; Y; Y10; Y10S; Y10S323/00; Y10S323/901
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
157 words
In a switching circuit for selectively connecting a d.c. power source to a load, including an electronic amplifier for amplifying an a.c. signal, said circuit having an input terminal adapted to be connected to a first terminal of said d.c. source, an output terminal adapted to be connected to a first terminal of said load, and a common terminal adapted to be connected to a second terminal of said source and to a second terminal of said load, said first terminal, said output terminal and said common terminal all being independent of said a.c. signal, the combination comprising a silicon transistor having base, emitter and collector electrodes, means for connecting said collector electrode to said input terminal, means for connecting said emitter electrode to said output terminal, a series circuit including a resistor and a switch connected between said base electrode and said input terminal, and a capacitor connected between said base electrode and said common terminal.
Claim 2
Dependent Claim
157 words
In a switching circuit for selectively connecting a d.c. power source to a load, including an electronic amplifier for amplifying an a.c. signal, said circuit having an input terminal adapted to be connected to a first terminal of said d.c. source, an output terminal adapted to be connected to a first terminal of said load, and a common terminal adapted to be connected to a second terminal of said source and to a second terminal of said load, said first terminal, said output terminal and said common terminal all being independent of said a.c. signal, the combination comprising a silicon transistor having base, emitter and collector electrodes, means for connecting said collector electrode to said input terminal, means for connecting said emitter electrode to said output terminal, a series circuit including a resistor and a switch connected between said base electrode and said input terminal, and a capacitor connected between said base electrode and said common terminal.
Claim 3
Dependent Claim
157 words
In a switching circuit for selectively connecting a d.c. power source to a load, including an electronic amplifier for amplifying an a.c. signal, said circuit having an input terminal adapted to be connected to a first terminal of said d.c. source, an output terminal adapted to be connected to a first terminal of said load, and a common terminal adapted to be connected to a second terminal of said source and to a second terminal of said load, said first terminal, said output terminal and said common terminal all being independent of said a.c. signal, the combination comprising a silicon transistor having base, emitter and collector electrodes, means for connecting said collector electrode to said input terminal, means for connecting said emitter electrode to said output terminal, a series circuit including a resistor and a switch connected between said base electrode and said input terminal, and a capacitor connected between said base electrode and said common terminal.
Claim 4
Dependent Claim
157 words
In a switching circuit for selectively connecting a d.c. power source to a load, including an electronic amplifier for amplifying an a.c. signal, said circuit having an input terminal adapted to be connected to a first terminal of said d.c. source, an output terminal adapted to be connected to a first terminal of said load, and a common terminal adapted to be connected to a second terminal of said source and to a second terminal of said load, said first terminal, said output terminal and said common terminal all being independent of said a.c. signal, the combination comprising a silicon transistor having base, emitter and collector electrodes, means for connecting said collector electrode to said input terminal, means for connecting said emitter electrode to said output terminal, a series circuit including a resistor and a switch connected between said base electrode and said input terminal, and a capacitor connected between said base electrode and said common terminal.
Claim 5
Dependent Claim
15 words
Apparatus according to claim 1, wherein said switch comprises a manually operable single-pole, single-throw switch.
Claim 6
Dependent Claim
15 words
Apparatus according to claim 1, wherein said switch comprises a manually operable single-pole, double-throw switch.
Claim 7
Dependent Claim
32 words
Apparatus according to claim 1, wherein said switch is connected to said first input terminal, and including means connecting the junction of said resistor and said switch to a second output terminal.
Claim 8
Dependent Claim
18 words
Apparatus according to claim 1, including a second capacitor connected between said output terminal and said common terminal.
Claim 9
Dependent Claim
95 words
A power supply circuit comprising a d.c. power source for an electronic amplifier for amplifying an a.c. signal, a silicon transistor having base, emitter and collector electrodes, both of said emitter and collector electrodes being independent of said a.c. signal, means for connecting said collector electrode to a first terminal of said source, means connecting said emitter electrode to an output terminal, a series circuit including a resistor and a switch connected between said base electrode and said collector electrode, and a capacitor connected between said base electrode and a second terminal of said source.
Claim 10
Dependent Claim
95 words
A power supply circuit comprising a d.c. power source for an electronic amplifier for amplifying an a.c. signal, a silicon transistor having base, emitter and collector electrodes, both of said emitter and collector electrodes being independent of said a.c. signal, means for connecting said collector electrode to a first terminal of said source, means connecting said emitter electrode to an output terminal, a series circuit including a resistor and a switch connected between said base electrode and said collector electrode, and a capacitor connected between said base electrode and a second terminal of said source.
Claim 11
Dependent Claim
31 words
Apparatus according to claim 6 wherein said switch is connected to said collector electrode, and including means connecting the junction of said resistor and said switch to a second output terminal.
Claim 12
Dependent Claim
21 words
Apparatus according to claim 7, including a capacitor interconnected between said second output terminal and said second terminal of said source.
Claim 13
Dependent Claim
18 words
Apparatus according to claim 8, including means adapted to connect said second output terminal to a d.c. motor.
References Cited (Backward Citations)
US3089964A
Cited
US3067338A
Cited
US3037113A
Cited
US3196201A
Cited
US3207952A
Cited
US3543053A
Cited
US3582799A
Cited
US3710143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |