US3605002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High precision power supply
Assignee: Digital Apparatus Corp
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Filing: 1970-03-27
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Granted: 1971-09-14
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Expires: 1990-03-27
Abstract
Abstract A high precision power supply generates voltage with an accuracy of at least 30 parts per million and is comprised of a digital section interconnected with an analog section by pulse transformers. Numbered keyboard switches in the digital section select a desired output voltage which is displayed numerically by electronic digital display tubes. A shift register in circuit with number storage means enables any one of the displayed numbers to be changed without changing any other displayed number. The analog section includes a stable reference voltage generator, electronic switch, filter and a high gain amplifier which produces an output voltage corresponding to the displayed numbers. The electronic switch passes proportional parts of the reference voltage to the amplifier via the filter under control of pulses received from the digital section. The amplifier is capable of producing current in one of two ranges depending upon the output voltage.
Inventors
- 👤 Robert C Smyth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:05
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; G06F3/0227; H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/157
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
A precision power supply for generating voltages with a high degree of accuracy comprising: a digital section comprising a switching means for selecting a voltage to be produced by said power supply, a display means connected to said switching means for visibly displaying said selected voltage, and a decoder means connected to said switching means for producing a plurality of pulses, each having a width proportional to that of said selected voltage, an analog section comprising a voltage generator means for providing a reference voltage, an amplifier means for increasing a voltage applied thereto, a coupling means connected to said voltage generator means and to said amplifier means and adapted to couple them together for a period corresponding to the width of said pulses, and a transformer coupling means connected to said decoder means in said digital section and to said coupling means in said analog section whereby selection of a voltage by said switching means will be displayed on said display means and said train of pulses produced by said decoder means is transmitted by said transformer coupling means to said coupling means which thereby couples said voltage generator means to said amplifier filter means for a period proportional to the width of said pulses.
Claim 2
Dependent Claim
206 words
A precision power supply for generating voltages with a high degree of accuracy comprising: a digital section comprising a switching means for selecting a voltage to be produced by said power supply, a display means connected to said switching means for visibly displaying said selected voltage, and a decoder means connected to said switching means for producing a plurality of pulses, each having a width proportional to that of said selected voltage, an analog section comprising a voltage generator means for providing a reference voltage, an amplifier means for increasing a voltage applied thereto, a coupling means connected to said voltage generator means and to said amplifier means and adapted to couple them together for a period corresponding to the width of said pulses, and a transformer coupling means connected to said decoder means in said digital section and to said coupling means in said analog section whereby selection of a voltage by said switching means will be displayed on said display means and said train of pulses produced by said decoder means is transmitted by said transformer coupling means to said coupling means which thereby couples said voltage generator means to said amplifier filter means for a period proportional to the width of said pulses.
Claim 3
Dependent Claim
100 words
A precision power supply as recited in claim 1 wherein said switching means comprises a plurality of digital keyboard switches and said decoder means comprises: a decoder connected in circuit with said switches, a number storage means having a plurality of individual stores, a shift register having a plurality of stages respectively corresponding to said stores, and a circuit means interconnecting said shift register and said stores so that each of said stages of said shift register is actuated in turn to lock one of said stores, thereby storing a number therein as keyboard switches are selectively operated in sequence.
Claim 4
Dependent Claim
46 words
A precision power supply as recited in claim 2 wherein said digital display means comprises a plurality of digital display tubes corresponding respectively to said stores so that each of said tubes displays only the number stores in a corresponding store of said number storage means.
Claim 5
Dependent Claim
85 words
A precision power supply as recited in claim 2 further comprising a clock-operated counter, a comparator interconnected with said counter and said number storages means for generating coincidence pulses at successive time intervals which are proportional to the magnitude of the number stored in the respective stores of said number storage means and circuit means connecting said comparator in circuit with said transformer coupling means for transmitting the coincidence pulses to said analog section, thereby generating therein the voltage numerically displayed by said display means.
Claim 6
Dependent Claim
72 words
A precision power supply as recited in claim 1 wherein said analog voltage generator means comprises a zener diode maintained at a predetermined temperature, at least one transistor in circuit with said diode for driving the same and at least one other transistor so connected in circuit with said one transistor that the effect of any characteristic change in said one transistor is precisely compensated for and cancelled by the other transistor.
Claim 7
Dependent Claim
89 words
A precision power supply as recited in claim 5 wherein said transformer coupling means comprises at least one solid-state switch connected in circuit with said zener diode to receive said reference voltage therefrom, said switch being connected in circuit with said digital section so that said switch is triggered on and off as said coincidental pulses are applied thereto for passage to said amplifier means, different proportional parts of said reference voltage corresponding to the magnitude of the desired voltage determined by selective operation of said digital keyboard switches.
Claim 8
Dependent Claim
31 words
A power supply as recited in claim 1 further comprising a filter means connected between said coupling means and said amplifier for converting a signal applied thereto into a DC signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |