US3745443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supplies with output voltage taps from input filter choke
Assignee: Raytheon Co
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Filing: 1971-12-07
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Granted: 1973-07-10
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Expires: 1991-12-07
Abstract
Abstract A power supply circuit which provides a simple means for obtaining several output voltages bearing a fixed ratio to each other. The circuit utilizes a multiple tapped choke which is connected to a source of D.C. voltage by a chopper or switch which provides a pulsating current at a repetition frequency greater than the L.C. resonant frequency of the choke and the filter capacitor at the D.C. output terminals. Several variations of the circuit are disclosed wherein the multiply-tapped choke, or equivalently several magnetically coupled windings, are connected in series with a free-wheeling diode which is always in the state of conduction except during the duration of an input pulse of current through the input chopper or switch so that there is always current in the inductive choke. Additional switching means such as a diode is connected from the taps on the choke to output terminals and is disposed to conduct during the free-wheeling period to extract the several output voltages, each bearing a fixed ratio to the other. To reduce output voltage ripple, capacitors are connected across the output taps to maintain the output voltages substantially constant during the entire cycle.
Inventors
- 👤 T Weil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:41
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/064
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
192 words
A power supply comprising a chopped voltage source and a pair of output terminals, a choke coil comprising at least a pair of separate windings magnetically coupled to each other, the first of said windings connected in series with one side of said voltage source and an output terminal, a first diode connected from the input side of said second winding to a common connection from the other side of said voltage source and the other output terminal, a second diode connected from a tap on said first winding to the other side of said second winding, an additional output terminal coupled to the common connection of said second diode and said other side of said second winding, said first and second diodes poled to conduct current during the free-wheeling period of said choke from said tap on said first winding through said second winding to said other output terminal and to provide an intermediate voltage at said additional output terminal which bears a fixed ratio to the total output voltage, and filter capacitors connected to said terminals in a manner to provide a filtering action for voltages applied to said terminals.
Claim 2
Dependent Claim
192 words
A power supply comprising a chopped voltage source and a pair of output terminals, a choke coil comprising at least a pair of separate windings magnetically coupled to each other, the first of said windings connected in series with one side of said voltage source and an output terminal, a first diode connected from the input side of said second winding to a common connection from the other side of said voltage source and the other output terminal, a second diode connected from a tap on said first winding to the other side of said second winding, an additional output terminal coupled to the common connection of said second diode and said other side of said second winding, said first and second diodes poled to conduct current during the free-wheeling period of said choke from said tap on said first winding through said second winding to said other output terminal and to provide an intermediate voltage at said additional output terminal which bears a fixed ratio to the total output voltage, and filter capacitors connected to said terminals in a manner to provide a filtering action for voltages applied to said terminals.
Claim 3
Dependent Claim
194 words
A power supply comprising a chopped voltage source and a pair of output terminals, a choke having at least a pair of independent windings magnetically coupled to each other, the first of said windings connected in series with one side of said voltage source and a first output terminal, a first diode connected from one side of the second of said windings to a common connection from the other side of said voltage source and a second output terminal, a second diode connected from the common terminal of said first winding and said one side of said voltage source to the other side of said second winding, an additional output terminal also connected to said other side of said second winding, said first and second diodes adapted to conduct during the free-wheeling period of said choke and poled in a direction to provide a current path from said second output terminal through said second winding and said first winding to the first output terminal to provide at said additional output terminal an intermediate output voltage which bears a fixed ratio to the voltage developed across both windings of said choke during said free-wheeling period.
Claim 4
Dependent Claim
194 words
A power supply comprising a chopped voltage source and a pair of output terminals, a choke having at least a pair of independent windings magnetically coupled to each other, the first of said windings connected in series with one side of said voltage source and a first output terminal, a first diode connected from one side of the second of said windings to a common connection from the other side of said voltage source and a second output terminal, a second diode connected from the common terminal of said first winding and said one side of said voltage source to the other side of said second winding, an additional output terminal also connected to said other side of said second winding, said first and second diodes adapted to conduct during the free-wheeling period of said choke and poled in a direction to provide a current path from said second output terminal through said second winding and said first winding to the first output terminal to provide at said additional output terminal an intermediate output voltage which bears a fixed ratio to the voltage developed across both windings of said choke during said free-wheeling period.
Claim 5
Dependent Claim
40 words
The apparatus as set forth in claim 2 in which a capacitor is connected from the input of said first winding of said choke to the common connection of said first diode and the said second winding of said choke.
Claim 6
Dependent Claim
214 words
A power supply comprising a chopped voltage source and a pair of output terminals, a choke including at least a pair of independent windings magnetically coupled to each other, the first of said windings connected in series with one side of said voltage source and a first output terminal, a first semiconductor device connected in series with the second of said windings and a common connection from the other side of said voltage source and a second output terminal, a second semiconductor device connected in series with the common terminal of said first winding and said one side of said voltage source and said serially connected first device and second winding, an additional output terminal also connected to the side of said second device which is adjacent to and in series with said second winding and its serially connected first device, said first and second devices adapted to conduct during the OFF periods of said chopped voltage source and poled in a direction to provide a current path including said first winding and said second winding and said second output terminal to provide at said additional output terminal an intermediate output voltage which bears a fixed ratio to the voltage developed across said first and second windings of said choke during said OFF periods.
Claim 7
Dependent Claim
214 words
A power supply comprising a chopped voltage source and a pair of output terminals, a choke including at least a pair of independent windings magnetically coupled to each other, the first of said windings connected in series with one side of said voltage source and a first output terminal, a first semiconductor device connected in series with the second of said windings and a common connection from the other side of said voltage source and a second output terminal, a second semiconductor device connected in series with the common terminal of said first winding and said one side of said voltage source and said serially connected first device and second winding, an additional output terminal also connected to the side of said second device which is adjacent to and in series with said second winding and its serially connected first device, said first and second devices adapted to conduct during the OFF periods of said chopped voltage source and poled in a direction to provide a current path including said first winding and said second winding and said second output terminal to provide at said additional output terminal an intermediate output voltage which bears a fixed ratio to the voltage developed across said first and second windings of said choke during said OFF periods.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |