Patent US3808512A successfully refreshed from Google Patents.
US3808512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformerless power supply
Assignee: Individual
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Filing: 1973-04-05
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Granted: 1974-04-30
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Expires: 1993-04-05
Abstract
Abstract Two sets of identical capacitors with interposed rectifying diodes are connected in series between a pair of supply terminals connected to an AC source, so that the two sets of capacitors are charged alternately on the successive half cycles of the AC voltage delivered through the supply terminals. The potential difference thus stored in each capacitor corresponds substantially to the quotient of the peak value of the AC supply voltage by the number of the capacitors of each set. The two sets of capacitors are caused alternately to discharge in parallel through their respective diodes, switching elements such as thyristors and a common DC load.
Inventors
- 👤 T Sakka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/162; H02M7/17
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
545 words
A power supply system driven from an AC source to supply a substantially constant DC voltage to a load, comprising: first and second supply terminals to be connected to the AC source; first and second load terminals to be connected to the load; a first set of capacitors connected in series between said first and second supply terminals each to be charged to a level substantially corresponding to the quotient of the peak value of the voltage from the AC source by the number of the capacitors of said first set; a first set of diodes connected in the seriesconnected circuit including said first set of capacitors and said first and second supply terminals, said first set of diodes being aeranged alternately with said first set of capacitors and being adapted to permit the flow of charging current to said first set of capacitors only when said first supply terminal is being impressed with each positive half cycle of the voltage from the AC source; a second set of diodes connected in a parallelconnected circuit of said first set of capacitors and adapted to prevent the flow of reverse current, said parallel-connected circuit of said first set of capacitors and said second set of diodes being connected between said first and second load terminals; a second set of capacitors connected in series between said first and second supply terminals each to be charged to a level substantially corresponding to the quotient of the peak value of the voltage from the AC source by the number of the capacitors of said second set, said second set of capacitors being equal in number to said first set of capacitors; a third set of diodes connected in the series-connected circuit including said second set of capacitors and said first and second supply terminals, said third set of diodes being arranged alternately with said second set of capacitors and being adapted to permit the flow of charging current to said second set of capacitors only when said second supply terminal is being impressed with each positive half cycle of the voltage from the AC source; a fourth set of diodes connected in a parallel-connected circuit of said second set of capacitors and adapted to prevent the flow of reverse current, said parallel-connected circuit of said second set of capacitors and said fourth set of dIodes being connected between said first and second load terminals; a first series connection of a thyristor and a transistor connected between said first load terminal and said parallel-connected circuit of said first set of capacitors and said second set of diodes, said first series connection of a thyristor and a transistor being rendered conductive when said first set of capacitors are charged to the predetermined level whereby said first set of capacitors are caused to discharge in parallel through the load; and a second series connection of a thyristor and a transistor connected between said first load terminal and said parallel-connected circuit of said second set of capacitors and said fourth set of diodes, said second series connection of a thyristor and a transistor being rendered conductive when said second set of capacitors are charged to the predetermined level whereby said second set of capacitors are caused to discharge in parallel through the load.
Claim 2
Dependent Claim
545 words
A power supply system driven from an AC source to supply a substantially constant DC voltage to a load, comprising: first and second supply terminals to be connected to the AC source; first and second load terminals to be connected to the load; a first set of capacitors connected in series between said first and second supply terminals each to be charged to a level substantially corresponding to the quotient of the peak value of the voltage from the AC source by the number of the capacitors of said first set; a first set of diodes connected in the seriesconnected circuit including said first set of capacitors and said first and second supply terminals, said first set of diodes being aeranged alternately with said first set of capacitors and being adapted to permit the flow of charging current to said first set of capacitors only when said first supply terminal is being impressed with each positive half cycle of the voltage from the AC source; a second set of diodes connected in a parallelconnected circuit of said first set of capacitors and adapted to prevent the flow of reverse current, said parallel-connected circuit of said first set of capacitors and said second set of diodes being connected between said first and second load terminals; a second set of capacitors connected in series between said first and second supply terminals each to be charged to a level substantially corresponding to the quotient of the peak value of the voltage from the AC source by the number of the capacitors of said second set, said second set of capacitors being equal in number to said first set of capacitors; a third set of diodes connected in the series-connected circuit including said second set of capacitors and said first and second supply terminals, said third set of diodes being arranged alternately with said second set of capacitors and being adapted to permit the flow of charging current to said second set of capacitors only when said second supply terminal is being impressed with each positive half cycle of the voltage from the AC source; a fourth set of diodes connected in a parallel-connected circuit of said second set of capacitors and adapted to prevent the flow of reverse current, said parallel-connected circuit of said second set of capacitors and said fourth set of dIodes being connected between said first and second load terminals; a first series connection of a thyristor and a transistor connected between said first load terminal and said parallel-connected circuit of said first set of capacitors and said second set of diodes, said first series connection of a thyristor and a transistor being rendered conductive when said first set of capacitors are charged to the predetermined level whereby said first set of capacitors are caused to discharge in parallel through the load; and a second series connection of a thyristor and a transistor connected between said first load terminal and said parallel-connected circuit of said second set of capacitors and said fourth set of diodes, said second series connection of a thyristor and a transistor being rendered conductive when said second set of capacitors are charged to the predetermined level whereby said second set of capacitors are caused to discharge in parallel through the load.
Claim 3
Dependent Claim
102 words
A power supply system as defined in claim 1, further comprising a first switching element connected between said second load terminal and said parallel-connected circuit of said first set of capacitors and said second set of diodes, said first switching element being rendered conductive simultaneously with said first series connection of a thyristor and a transistor, and a second switching element connected between said second load terminal and said parallel-connected circuit of said second set of capacitors and said fourth set of diodes, said second switching element being rendered conductive simultaneously with said second series connection of a thyristor and a transistor.
Claim 4
Dependent Claim
20 words
A power supply system as defined in claim 2 wherein said first and said second switching elements are both thyristors.
Claim 5
Dependent Claim
103 words
A power supply system as defined in claim 1, including a switching element connected in place of that one of the diodes of said first set of diodes which is positioned closest to said second supply terminal, said switching element being rendered conductive simultaneously with said second series connection of a thyristor and a transistor, and an additional switching element connected in place of that one of the diodes of said third set of diodes which is positioned closest to said first supply terminal, said additional switching element being rendered conductive simultaneously with said first series connection of a thyristor and a transistor.
Claim 6
Dependent Claim
16 words
A power supply system as defined in claim 4, wherein said switching elements are both thyristors.
Claim 7
Dependent Claim
38 words
A power supply system as defined in claim 1, including a series connection of a diode and a transistor connected in place of each of said first and said second series connection of a thyristor and a transistor.
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |