Patent US3747008A successfully refreshed from Google Patents.
US3747008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reference power supply having an output voltage less than its control element
Assignee: Control Data Corp
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Filing: 1971-12-23
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Granted: 1973-07-17
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Expires: 1991-12-23
Abstract
Abstract A power supply producing a bi-polar reference voltage uses a constant votage element, such as a zener diode, in a negative feedback loop from the reference voltage output of an amplifier to the input of another amplifier in a two amplifier system. This negative feedback loop permits the establishment of a reference voltage output lower in magnitude than the voltage of the constant voltage element.
Inventors
- 👤 L Zaretsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/461
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
A power supply for producing a reference voltage comprising: first and second amplifiers each having input and an output; said first amplifier being responsive to an input voltage to produce an output voltage having the same polarity as said input voltage, said second amplifier being responsive to said output voltage to produce said reference voltage at its output, said reference voltage having a polarity opposite to that of said output voltage; a negative feedback loop connecting the output of said second amplifier to the input of said first amplifier, said feedback loop including a zener diode so disposed and arranged that the more negative of said input voltage and said reference voltage appears at its anode and the more positive of said input voltage and said reference voltage appears at its cathode; and a voltage source connected to the output of said second amplifier through a resistance, said source providing a voltage having the same polarity as said reference voltage.
Claim 2
Dependent Claim
160 words
A power supply for producing a reference voltage comprising: first and second amplifiers each having input and an output; said first amplifier being responsive to an input voltage to produce an output voltage having the same polarity as said input voltage, said second amplifier being responsive to said output voltage to produce said reference voltage at its output, said reference voltage having a polarity opposite to that of said output voltage; a negative feedback loop connecting the output of said second amplifier to the input of said first amplifier, said feedback loop including a zener diode so disposed and arranged that the more negative of said input voltage and said reference voltage appears at its anode and the more positive of said input voltage and said reference voltage appears at its cathode; and a voltage source connected to the output of said second amplifier through a resistance, said source providing a voltage having the same polarity as said reference voltage.
Claim 3
Dependent Claim
24 words
The power supply of claim 1 and further comprising means for controlling the gain of at least one of said amplifiers within predetermined limits.
Claim 4
Dependent Claim
48 words
The power supply of claim 1 wherein said reference voltage is of negative polarity and wherein the anode of said zener diode is connected to the output of said second amplifier and wherein the cathode of said zener diode is connected to the input of said first amplifier.
Claim 5
Dependent Claim
59 words
The power supply of claim 3 wherein the output of said first amplifier is connected through a resistance to a voltage source of positive polarity and further comprising means for controlling the gain of at least one of said amplifiers, whereby the reference voltage output of said power supply may be varied in bi-polar fashion about a zero voltage.
Claim 6
Dependent Claim
69 words
The power supply of claim 3 wherein the gain of said first amplifier is controlled by a variable resistor connected between the output of said first amplifier and a second input of said first amplifier having an opposite polarity to said first-named input, said first amplifier having an additional feedback loop in the form of a resistor connected between said second input and the anode of said zener diode.
Claim 7
Dependent Claim
25 words
The power supply of claim 5 wherein the output of said first amplifier is connected through a resistance to a voltage source of positive polarity.
Claim 8
Dependent Claim
33 words
The power supply of claim 6 further including a further feedback loop in the form of a resistor connected between the cathode of said zener diode and the output of said first amplifier.
References Cited (Backward Citations)
US3133242A
Cited
US3603975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |