US3581187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulated dc power supply
Assignee: METRODYNAMICS CORP
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Filing: 1969-06-23
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Granted: 1971-05-25
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Expires: 1989-06-23
Abstract
Abstract A regulated DC power supply wherein the main pass transistor is connected to an operational amplifier having a positive feedback which rapidly switches the main pass transistor on and off, rather than maintaining transistor continuously on, so as to intermittently supply DC power from a rectified source to the output of the supply while maintaining the voltage of the output within predetermined limits of voltage regulation for various loads and line current fluctuations. By rapidly switching the main pass transistor, it is possible to significantly reduce its heat dissipation and therefore reduce the size and cost of the power supply.
Inventors
- 👤 Charles B Grady Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:48
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M3/1563
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
A switching-type regulated DC power supply energized from a rectified alternating current source for powering a load connected to the output comprising; semiconductor switching means connected in series circuit between the rectified source and the output, an operational amplifier having a first and a second input and having its output connected to the control input of said semiconductor switching means, said amplifier having a positive feedback connection between its output and said first input, voltage reference means for producing a reference voltage and connected to said first input of said operational amplifier, said second input of said amplifier being coupled to sample the output supply voltage, an inductor coupled in series connection between the rectified source and the output of the supply, a commutating diode for coupling the output energy of said inductor into the output of said supply, and capacitor means coupled across said output terminals of said supply, said operational amplifier alternately turning on and off said semiconductor switching means in response to said sample output voltage relative to said voltage reference source.
Claim 2
Dependent Claim
175 words
A switching-type regulated DC power supply energized from a rectified alternating current source for powering a load connected to the output comprising; semiconductor switching means connected in series circuit between the rectified source and the output, an operational amplifier having a first and a second input and having its output connected to the control input of said semiconductor switching means, said amplifier having a positive feedback connection between its output and said first input, voltage reference means for producing a reference voltage and connected to said first input of said operational amplifier, said second input of said amplifier being coupled to sample the output supply voltage, an inductor coupled in series connection between the rectified source and the output of the supply, a commutating diode for coupling the output energy of said inductor into the output of said supply, and capacitor means coupled across said output terminals of said supply, said operational amplifier alternately turning on and off said semiconductor switching means in response to said sample output voltage relative to said voltage reference source.
Claim 3
Dependent Claim
38 words
The power supply as recited in claim 1, wherein said operational amplifier additionally comprises a further rectifier power source having its output coupled to said amplifier for providing DC power to said amplifier and said voltage reference means.
Claim 4
Dependent Claim
47 words
The power supply as recited in claim 1 wherein said semiconductor switching means comprises at least one switching transistor having its emitter and collector terminals in series connection between the rectified source and the supply output, and its base terminal connected to the output of said amplifier.
Claim 5
Dependent Claim
27 words
The power supply as recited in claim 3 wherein said voltage reference means comprises at least one Zener diode connected to said first input of said amplifier.
Claim 6
Dependent Claim
27 words
The power source as recited in claim 2 additionally comprising variable resistor means connected across the supply output and coupled to said second input of said amplifier.
Claim 7
Dependent Claim
30 words
The power source as recited in claim 5 additionally comprising at least one overload resistor in series connection with said supply output for limiting the output current of the supply.
Claim 8
Dependent Claim
60 words
The power source as recited in claim 4, additionally comprising normally open thermal switch means in series connection with said positive feedback connection, Said switch means being thermally responsive to the temperature of said main pass transistor so as to connect same feedback connection to said operational amplifier when the temperature of said main pass transistor exceeds a predetermined level.
Claim 9
Dependent Claim
16 words
The power source as recited in claim 7 wherein said switch means comprises a thermal relay.
References Cited (Backward Citations)
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |