US4942508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching regulator
Assignee: Fanuc Corp
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Filing: 1988-10-18
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Granted: 1990-07-17
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Expires: 2008-10-18
Abstract
Abstract A switching regulator for controlling an output voltage by a pulse width of a switching element such as a transistor and the like at a primary side of the switching regulator. The switching regulator is provided with a feedback element which converts an output voltage at a secondary side into a feedback current, and controls an amount of charge of a capacitor (C3) to control a time for which the transistor (Q1) is kept on at the primary side and an amount of charge of a speed-up capacitor (C2) at the primary side. When a small load is imposed, an excessive increase in the output voltage can be prevented by controlling an amount of charge on the capacitor (3) to control the keeping-on-time and an amount of charge of the speed-up capacitor (C2) at the primary side. This also shortens the time for which the transistor (Q1) at the primary side is kept on.
Inventors
- 👤 Shigeo Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:41
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A switching regulator for controlling an output voltage by using a pulse width of a switching element such as a translator at a primary side of the switching regulator, comprising: a speed-up capacitor located at the primary side of the switching regulator; a capacitor operatively connected to the transistor; a first feedback element, operatively connected to said capacitor and the transistor, for converting an output voltage at a secondary side into a feedback current, for controlling an amount of charge on said capacitor to control a time for which the transistor at the primary side is kept on, and for controlling an amount of charge of said speed-up capacitor; and a second feedback element, operatively connected to said speed-up capacitor and said capacitor, for suppressing a discharge current from said speed-up capacitor and said capacitor and decreasing on-time of the transistor to decrease the output voltage when the output voltage is high.
Claim 2
Dependent Claim
152 words
A switching regulator for controlling an output voltage by using a pulse width of a switching element such as a translator at a primary side of the switching regulator, comprising: a speed-up capacitor located at the primary side of the switching regulator; a capacitor operatively connected to the transistor; a first feedback element, operatively connected to said capacitor and the transistor, for converting an output voltage at a secondary side into a feedback current, for controlling an amount of charge on said capacitor to control a time for which the transistor at the primary side is kept on, and for controlling an amount of charge of said speed-up capacitor; and a second feedback element, operatively connected to said speed-up capacitor and said capacitor, for suppressing a discharge current from said speed-up capacitor and said capacitor and decreasing on-time of the transistor to decrease the output voltage when the output voltage is high.
Claim 3
Dependent Claim
14 words
A switching regular according to claim 1, wherein said feedback element comprises a photocoupler.
Claim 4
Dependent Claim
337 words
A switching regulator, comprising: a snubber circuit; a first transistor having a collector, having a base operatively connected to said snubber circuit, and having an emitter; a second transistor having a collector connected to the base of said first transistor, having an emitter connected to the emitter of said first transistor, and having a base; a speed-up capacitor operatively connected to said snubber circuit and said second transistor; a capacitor, operatively connected to said base of said second transistor, for turning on and off said first and second transistors and controlling an output voltage of the switching regulator; a first resistor operatively connected to the base of said second transistor and to said capacitor; a zener diode connected in series with said first resistor; a first diode operatively connected to said zener diode; a second resistor operatively connected to a connection of said base of said second transistor, said second capacitor and said first resistor; a second diode operatively connected in series with said second resistor and connected to said first diode; a third resistor operatively connected to said speed-up capacitor; a third diode operatively connected to said third resistor; first photocoupler means, operatively connected between said third diode and the base of said second transistor, for feeding back an output voltage through said third diode for controlling a charge current to said capacitor; second photocoupler means, operatively connected to said speed-up capacitor, for suppressing a discharge current from said capacitor and accelerating a timing for turning on said second transistor; a third transistor having a base operatively connected to said second photocoupler means, having a collector connected to said second photocoupler means and to said capacitor, and having an emitter; a fourth diode operatively connected between said zener diode and the emitter of said third transistor, a connection node formed between said fourth diode and the emitter of said third transistor; and a fifth diode connected between said speed-up capacitor and the connection node formed between said fourth diode and the emitter of said third transistor.
Claim 5
Dependent Claim
337 words
A switching regulator, comprising: a snubber circuit; a first transistor having a collector, having a base operatively connected to said snubber circuit, and having an emitter; a second transistor having a collector connected to the base of said first transistor, having an emitter connected to the emitter of said first transistor, and having a base; a speed-up capacitor operatively connected to said snubber circuit and said second transistor; a capacitor, operatively connected to said base of said second transistor, for turning on and off said first and second transistors and controlling an output voltage of the switching regulator; a first resistor operatively connected to the base of said second transistor and to said capacitor; a zener diode connected in series with said first resistor; a first diode operatively connected to said zener diode; a second resistor operatively connected to a connection of said base of said second transistor, said second capacitor and said first resistor; a second diode operatively connected in series with said second resistor and connected to said first diode; a third resistor operatively connected to said speed-up capacitor; a third diode operatively connected to said third resistor; first photocoupler means, operatively connected between said third diode and the base of said second transistor, for feeding back an output voltage through said third diode for controlling a charge current to said capacitor; second photocoupler means, operatively connected to said speed-up capacitor, for suppressing a discharge current from said capacitor and accelerating a timing for turning on said second transistor; a third transistor having a base operatively connected to said second photocoupler means, having a collector connected to said second photocoupler means and to said capacitor, and having an emitter; a fourth diode operatively connected between said zener diode and the emitter of said third transistor, a connection node formed between said fourth diode and the emitter of said third transistor; and a fifth diode connected between said speed-up capacitor and the connection node formed between said fourth diode and the emitter of said third 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) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |