Patent US3668509A successfully refreshed from Google Patents.
US3668509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply system for and method of energizing multiple level loads
Assignee: McGraw Edison Co
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Filing: 1971-02-11
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Granted: 1972-06-06
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Expires: 1991-02-11
Abstract
Abstract A power supply for a direct current load that has two power level requirements senses the current requirements of the load and operates a high output inverter at high power requirements and a low output inverter at low power requirements. The high and low output inverters are designed for maximum efficiency in their respective power ranges and are connected through full wave rectifying bridges to the load. The high power inverter is maintained in an ''''off'''' position until the load current requirement is increased. Upon the increase in current, a sensing circuit and energy storage device activates a switch to energize the high power inverter to power the load as long as the current requirements remain above a selected level.
Inventors
- 👤 Richard E Riebs
- 👤 Curtis J Kohlman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387; H02M3/3388; H02M1/00; H02M1/0003; H02M1/0032; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
190 words
A power supply system comprising: a load alternatively operable at a high power level and at a low power level; an electrical power source; a first power means for converting electrical power from the power source to energize the load operating at a low power level; a second power means for converting electrical power from the power source to energize the load operating at a high power level; a sensing means for sensing the power level of operation of the load to produce an output indicating the level of operation of the load; a switching means responsive to the output for connecting the second power means to be energized from the power source when the load is operating at a high power level and for disconnecting the second power means from the source when the load is operating at a low power level; and an energy storage means connected to be energized by the first power means for storing electrical energy received from the operation of said first power means at a level sufficient to operate the sensing means upon initial operation of the load at its high power level.
Claim 2
Dependent Claim
190 words
A power supply system comprising: a load alternatively operable at a high power level and at a low power level; an electrical power source; a first power means for converting electrical power from the power source to energize the load operating at a low power level; a second power means for converting electrical power from the power source to energize the load operating at a high power level; a sensing means for sensing the power level of operation of the load to produce an output indicating the level of operation of the load; a switching means responsive to the output for connecting the second power means to be energized from the power source when the load is operating at a high power level and for disconnecting the second power means from the source when the load is operating at a low power level; and an energy storage means connected to be energized by the first power means for storing electrical energy received from the operation of said first power means at a level sufficient to operate the sensing means upon initial operation of the load at its high power level.
Claim 3
Dependent Claim
42 words
A power supply system according to claim 1 wherein said energy storage means comprises a capacitor connected between the first power means and the sensing means and connected to store electrical energy at said level during operation of said first power means.
Claim 4
Dependent Claim
55 words
A power supply system according to claim 1 wherein said switching means comprises a switching transistor connected between the battery and the second power means and connected to respond to the sensing means transistor to turn on when said sensing transistor is turned on and to turn off when said sensing transistor is turned off.
Claim 5
Dependent Claim
59 words
A power supply system according to claim 1 wherein said sensing means comprises a shunt resistance connected between the first power means and the load and a transistor connected to sense the voltage across the shunt resistance to turn on when the voltage exceeds a preselected level and to turn off when said voltage is below a preselected level.
Claim 6
Dependent Claim
37 words
A power supply system according to claim 4 wherein said energy storage means comprises a capacitor connected between the first power means and the sensing means and connected to store electrical energy for operation of the transistor.
Claim 7
Dependent Claim
57 words
A power supply system according to claim 5 wherein said switching means comprises a switching transistor connected between the battery and the second power means and connected to respond to the sensing means transistor to turn on when said sensing means transistor is turned on and to turn off when said sensing means transistor is turned off.
Claim 8
Dependent Claim
215 words
A power supply system comprising: a direct current power source; a direct current load alternatively operable at a high current level and at a low current level; a low level converter adapted and connected to provide power to the load during its low current level operation and connected to be energized by the battery; a high level converter adapted to provide power to the load during its high current level operation; a sensing means comprising a shunt resistance connected between the converters and the load for sensing the current to the load and a transistor connected to sense the voltage across the shunt resistance to produce a first output when the voltage is below a preselected level and to produce a second output when said voltage exceeds a preselected level; a switching means responsive to the outputs for connecting the battery to energize the high power converter in response to the second output and for disconnecting the battery from the high power converter in response to the first output; and an energy storage means for storing electrical energy received from the operation of the low level converter at a level sufficient to provide sufficient current through the shunt resistance to turn on the transistor upon initial operation of the load at a high current level.
Claim 9
Dependent Claim
215 words
A power supply system comprising: a direct current power source; a direct current load alternatively operable at a high current level and at a low current level; a low level converter adapted and connected to provide power to the load during its low current level operation and connected to be energized by the battery; a high level converter adapted to provide power to the load during its high current level operation; a sensing means comprising a shunt resistance connected between the converters and the load for sensing the current to the load and a transistor connected to sense the voltage across the shunt resistance to produce a first output when the voltage is below a preselected level and to produce a second output when said voltage exceeds a preselected level; a switching means responsive to the outputs for connecting the battery to energize the high power converter in response to the second output and for disconnecting the battery from the high power converter in response to the first output; and an energy storage means for storing electrical energy received from the operation of the low level converter at a level sufficient to provide sufficient current through the shunt resistance to turn on the transistor upon initial operation of the load at a high current level.
Claim 10
Dependent Claim
39 words
A power supply system according to claim 7 wherein said energy storage means comprises a capacitor connected between the low power converter and the shunt resistance and connected to store electrical energy during operation of the low power converter.
Claim 11
Dependent Claim
55 words
A power supply system according to claim 8 wherein said switching means comprises a switching transistor connected between the battery and the high level converter and connected to respond to the sensing means transistor to turn on when said sensing transistor is turned on and to turn off when said sensing transistor is turned off.
Claim 12
Independent Claim
145 words
A method of energizing a direct current load alternatively operable at a high current level and a low current level from direct current source comprising: energizing the load at its low current level operation from a first converter energized by the battery, and designed for efficient operation at the low level operation of the load; sensing the current to the load with a transistor; storing energy during the operation of the low level converter at a level sufficient to operate the transistor; supplying said energy to the transistor upon initial operation of the load at the high current level; and energizing the load from a second converter energized by the battery and designed for efficient operation at the high level operation of the load in response to an indication by the operation of the transistor that said load is operating at the high current level.
Claim 13
Independent Claim
145 words
A method of energizing a direct current load alternatively operable at a high current level and a low current level from direct current source comprising: energizing the load at its low current level operation from a first converter energized by the battery, and designed for efficient operation at the low level operation of the load; sensing the current to the load with a transistor; storing energy during the operation of the low level converter at a level sufficient to operate the transistor; supplying said energy to the transistor upon initial operation of the load at the high current level; and energizing the load from a second converter energized by the battery and designed for efficient operation at the high level operation of the load in response to an indication by the operation of the transistor that said load is operating at the high current level.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |