Patent US3820004A successfully refreshed from Google Patents.
US3820004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current voltage supply apparatus
Assignee: Denso Corp
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Filing: 1973-01-29
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Granted: 1974-06-25
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Expires: 1993-01-29
Abstract
Abstract A dc voltage supply apparatus comprising a dc power supply, a semiconductor switching circuit connected to the dc power supply, a first-capacitor charging circuit including a first capacitor and a first rectifying element and connected to the semiconductor switching circuit, a circuit including the first capacitor, a second capacitor and a second rectifying element and connected to the semiconductor switching circuit for discharging the first capacitor and charging the second capacitor, an output terminal connected to one end of the second capacitor, and a current limiter provided in at least one of the charging circuit and the charging and discharging circuit.
Inventors
- 👤 A Sugiura
- 👤 A Okomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:04
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
234 words
A dc voltage supply apparatus comprising a negative voltage generating circuit and a doubled voltage generating circuit, the negatIve voltage generating circuit comprising: a switching element; a series circuit of a first capacitor, an emitter collector of a first transistor, and a second capacitor, the series circuit connected in parallel to said switching element; a first diode connected in parallel to said switching element through said first capacitor; the first capacitor being charged up by a dc power source through said first diode when said switching element is open; and a discharging circuit for said first capacitor being formed of said switching element, said second capacitor, and the emittercollector of said first transistor when said switching element is closed; the doubled voltage generating circuit comprising: a series connection of a third capacitor, an emitter-collector of a second transistor, and a fourth capacitor connected between said switching element and said dc power source; a charging circuit for said third capacitor formed of a series connection of said dc power source, a second diode, a resistor, said third capacitor and said switching element to charge up said third capacitor through said second diode, said resistor, and said switching element from said dc power source when said switching element is closed; and a discharging circuit for said third capacitor formed of the emitter-collector of said second transistor and said fourth capacitor when said switching element is open.
Claim 2
Dependent Claim
234 words
A dc voltage supply apparatus comprising a negative voltage generating circuit and a doubled voltage generating circuit, the negatIve voltage generating circuit comprising: a switching element; a series circuit of a first capacitor, an emitter collector of a first transistor, and a second capacitor, the series circuit connected in parallel to said switching element; a first diode connected in parallel to said switching element through said first capacitor; the first capacitor being charged up by a dc power source through said first diode when said switching element is open; and a discharging circuit for said first capacitor being formed of said switching element, said second capacitor, and the emittercollector of said first transistor when said switching element is closed; the doubled voltage generating circuit comprising: a series connection of a third capacitor, an emitter-collector of a second transistor, and a fourth capacitor connected between said switching element and said dc power source; a charging circuit for said third capacitor formed of a series connection of said dc power source, a second diode, a resistor, said third capacitor and said switching element to charge up said third capacitor through said second diode, said resistor, and said switching element from said dc power source when said switching element is closed; and a discharging circuit for said third capacitor formed of the emitter-collector of said second transistor and said fourth capacitor when said switching element is open.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |