Patent US3917993A successfully refreshed from Google Patents.
US3917993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bistable regulator having positive and negative feedback
Assignee: Klein Schanzlin and Becker AG
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Filing: 1973-10-26
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Granted: 1975-11-04
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Expires: 1993-10-26
Abstract
Abstract A variable resistor having a resistance varying as a function of the characteristic to be controlled is connected in series with a resistor adjusted to the desired value of the characteristic, to form one arm of a bridge circuit whose other arms are fixed resistors. The common junction of two of the fixed resistors is directly connected to the direct input of an operational amplifier in whose output is connected to regulating element which regulates the characteristic to be controlled. A voltage divider is connected from the operational amplifier output to the inverting input. A capacitor is connected from one tap of the voltage divider to the direct input. The feedback circuit thus furnishes a negative feedback having a delay and a positive feedback having a differentiator characteristic, while the use of the bridge circuit allows use of an unsymmetrical power supply.
Inventors
- 👤 Ernst Picmaus
- 👤 Bernhard Bach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:47
CPC Classifications
G; G05; G05B; G05B6/00; G05B6/02; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
223 words
A regulator circuit, comprising, in combination, operational amplifier means having a direct and an inverting input and an operational amplifier output; and feedback circuit means connected between said operational amplifier output and said inverting input for furnishing a delayed negative feedback and connected between said operational amplifier output and said direct input for furnishing a positive feedback, said feedback circuit means connected between said operational amplifier output and said direct input including a differentiator circuit; further comprising a power supply having a first and second voltage terminal; and wherein said feedback circuit means comprise a voltage divider having a first divider end terminal connected to said operational amplifier output, a second divider end terminal, and a first and second voltage divider tap, a variable impedance having an impedance varying as a function of the actual value of a quantity to be controlled connected between said second voltage terminal and said second terminal, means for connecting said second divider end terminal to said first voltage terminal, means for directly connecting said inverting input to said first voltage divider tap, a capacitor, means for interconnecting said capacitor between said second voltage divider tap and said direct input of said operational amplifier, and a resistor connected from said direct input to said second voltage terminal, whereby said capacitor and said resistor together constitute said differentiator circuit.
Claim 2
Dependent Claim
223 words
A regulator circuit, comprising, in combination, operational amplifier means having a direct and an inverting input and an operational amplifier output; and feedback circuit means connected between said operational amplifier output and said inverting input for furnishing a delayed negative feedback and connected between said operational amplifier output and said direct input for furnishing a positive feedback, said feedback circuit means connected between said operational amplifier output and said direct input including a differentiator circuit; further comprising a power supply having a first and second voltage terminal; and wherein said feedback circuit means comprise a voltage divider having a first divider end terminal connected to said operational amplifier output, a second divider end terminal, and a first and second voltage divider tap, a variable impedance having an impedance varying as a function of the actual value of a quantity to be controlled connected between said second voltage terminal and said second terminal, means for connecting said second divider end terminal to said first voltage terminal, means for directly connecting said inverting input to said first voltage divider tap, a capacitor, means for interconnecting said capacitor between said second voltage divider tap and said direct input of said operational amplifier, and a resistor connected from said direct input to said second voltage terminal, whereby said capacitor and said resistor together constitute said differentiator circuit.
Claim 3
Dependent Claim
329 words
A regulator circuit, comprising, in combination, an operational amplifier having a direct and an inverting input and an operational amplifier output; a power supply having a first and second voltage terminal; and feedback circuit means connected between said operational amplifier output and said inverting input for furnishing a delayed negative feedback and connected between said operational amplifier output and said direct input for furnishing a positive feedback, said feedback circuit means connected between said operational amplifier output and said direct input including a differentiator circuit, said feedback circuit means comprising a voltage divider having a first divider end terminal connected to said operational amplifier output, a second divider end terminal, and a first and second voltage divider tap, means connecting said second divider end terminal to said first voltage terminal, means for directly connecting said inverting input to said first voltage divider tap, a capacitor, means for interconnecting said capacitor between said second voltage divider tap and said direct input of said operational amplifier, and a resistor connected from said direct input to said second voltage terminal, whereby said capacitor and said resistor together constitute said differentiator circuit; an adjustable impedance having an impedance corresponding to the desired value of a quantity to be controlled; a variable impedance having an impedance varying as a function of the actual value of said quantity to be controlled connected to said adjustable impedance thereby forming a series circuit; means for connecting said series circuit between said second voltage terminal and said second divider end terminal; a first fixed impedance connected between said second divider end terminal and said first voltage terminal; and a second fixed impedance connected between said first fixed impedance and said direct input of said operational amplifier, whereby said first and second fixed impedances, said resistor, and said variable and adjustable impedance together constitute a bridge circuit having a first balance terminal at said second divider end terminal and a second balance terminal directly connected to said direct input.
Claim 4
Dependent Claim
329 words
A regulator circuit, comprising, in combination, an operational amplifier having a direct and an inverting input and an operational amplifier output; a power supply having a first and second voltage terminal; and feedback circuit means connected between said operational amplifier output and said inverting input for furnishing a delayed negative feedback and connected between said operational amplifier output and said direct input for furnishing a positive feedback, said feedback circuit means connected between said operational amplifier output and said direct input including a differentiator circuit, said feedback circuit means comprising a voltage divider having a first divider end terminal connected to said operational amplifier output, a second divider end terminal, and a first and second voltage divider tap, means connecting said second divider end terminal to said first voltage terminal, means for directly connecting said inverting input to said first voltage divider tap, a capacitor, means for interconnecting said capacitor between said second voltage divider tap and said direct input of said operational amplifier, and a resistor connected from said direct input to said second voltage terminal, whereby said capacitor and said resistor together constitute said differentiator circuit; an adjustable impedance having an impedance corresponding to the desired value of a quantity to be controlled; a variable impedance having an impedance varying as a function of the actual value of said quantity to be controlled connected to said adjustable impedance thereby forming a series circuit; means for connecting said series circuit between said second voltage terminal and said second divider end terminal; a first fixed impedance connected between said second divider end terminal and said first voltage terminal; and a second fixed impedance connected between said first fixed impedance and said direct input of said operational amplifier, whereby said first and second fixed impedances, said resistor, and said variable and adjustable impedance together constitute a bridge circuit having a first balance terminal at said second divider end terminal and a second balance terminal directly connected to said direct input.
Claim 5
Dependent Claim
325 words
A regulator circuit, comprising, in combination, an operational amplifier having a direct and an inverting input and an operational amplifier output; a power supply having a first and second voltage terminal; and feedback circuit means connected between said operational amplifier output and said inverting input for furnishing a delayed negative feedback and connected between said operational amplifier output and said direct input for furnishing a positive feedback, said feedback circuit means connected between said operational amplifier output and said direct input including a differentiator circuit, said feedback circuit means comprising a voltage divider having a first divider end terminal connected to said operational amplifier output, a second divider end terminal, and a first and second voltage divider tap, means connecting said second divider end terminal to said first voltage terminal, means for directly connecting said inverting input to said first voltage divider tap, a capacitor; means for interconnecting said capacitor between Said second voltage divider tap and said direct input of said operational amplifier, and a resistor connected from said direct input to said second voltage terminal, whereby said capacitor and said resistor together constitute said differentiator circuit; an adjustable impedance having an impedance corresponding to the desired value of a quantity to be controlled connected to said second voltage terminal; a variable impedance having an impedance varying as a function of the actual value of said quantity to be controlled connected to said adjustable impedance and to said second divider end terminal; a first fixed impedance connected between said variable impedance and said first voltage terminal; and a second fixed impedance connected between said first fixed impedance and said direct input of said operational amplifier, whereby said first and second fixed impedances, said resistor, and said variable and adjustable impedance together constitute a bridge circuit having a first balance terminal at the common point of said first fixed impedance and said variable impedance and a second balance terminal directly connected to said direct input.
Claim 6
Dependent Claim
325 words
A regulator circuit, comprising, in combination, an operational amplifier having a direct and an inverting input and an operational amplifier output; a power supply having a first and second voltage terminal; and feedback circuit means connected between said operational amplifier output and said inverting input for furnishing a delayed negative feedback and connected between said operational amplifier output and said direct input for furnishing a positive feedback, said feedback circuit means connected between said operational amplifier output and said direct input including a differentiator circuit, said feedback circuit means comprising a voltage divider having a first divider end terminal connected to said operational amplifier output, a second divider end terminal, and a first and second voltage divider tap, means connecting said second divider end terminal to said first voltage terminal, means for directly connecting said inverting input to said first voltage divider tap, a capacitor; means for interconnecting said capacitor between Said second voltage divider tap and said direct input of said operational amplifier, and a resistor connected from said direct input to said second voltage terminal, whereby said capacitor and said resistor together constitute said differentiator circuit; an adjustable impedance having an impedance corresponding to the desired value of a quantity to be controlled connected to said second voltage terminal; a variable impedance having an impedance varying as a function of the actual value of said quantity to be controlled connected to said adjustable impedance and to said second divider end terminal; a first fixed impedance connected between said variable impedance and said first voltage terminal; and a second fixed impedance connected between said first fixed impedance and said direct input of said operational amplifier, whereby said first and second fixed impedances, said resistor, and said variable and adjustable impedance together constitute a bridge circuit having a first balance terminal at the common point of said first fixed impedance and said variable impedance and a second balance terminal directly connected to said direct input.
Claim 7
Dependent Claim
32 words
A regulator as set forth in claim 3, wherein said adjustable impedance is an adjustable resistor, and wherein said variable impedance is a variable resistor connected in series to said adjustable resistor.
Claim 8
Dependent Claim
23 words
A regulator as set forth in claim 4, wherein said first and second fixed impedances are, respectively, a first and second fixed resistor.
Claim 9
Dependent Claim
26 words
A regulator as set forth in claim 3, wherein said voltage divider comprises a potentiometer having a wiper, said wiper constituting said first voltage divider tap.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |