US4449175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching regulator
Assignee: Toko Inc
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Filing: 1982-04-23
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Granted: 1984-05-15
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Expires: 2002-04-23
Abstract
Abstract In a switching regulator including a pulse-width modulator for controlling the pulse width of a base input applied to a pair of transistors which are alternately turned on and off by the base input, the pulse-width modulator is provided, by an error amplifier, with an input corresponding to the magnitude of a detected output voltage, and variations in the input applied to the pulse-width modulator for increasing the pulse-width of the aforementioned base input are moderated by means of a time-constant circuit and a circuit for causing the time-constant circuit to be charged and discharged.
Inventors
- 👤 Masanori Ishii
- 👤 Hiroichi Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:59
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3376
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A switching regulator of the type wherein a pair of transistors are alternately turned on and off by a base input applied thereto so that a current which is alternately reversed in direction is caused to flow through a primary winding of a main transformer; and a voltage induced in a secondary winding of the main transformer is rectified to obtain a DC output; and the pulse width of said base input is controlled in accordance with the magnitude of a detected output voltage by means of a pulse-width modulator to maintain the output voltage constant, characterized in that said pulse-width modulator is provided, by an error amplifier, with an input corresponding to the magnitude of said detected output voltage; and variations in the input applied to the pulse-width modulator for increasing the pulse width of said base input are moderated by means of a time-constant circuit and a circuit for causing said time-constant circuit to be charged and discharged.
Claim 2
Dependent Claim
160 words
A switching regulator of the type wherein a pair of transistors are alternately turned on and off by a base input applied thereto so that a current which is alternately reversed in direction is caused to flow through a primary winding of a main transformer; and a voltage induced in a secondary winding of the main transformer is rectified to obtain a DC output; and the pulse width of said base input is controlled in accordance with the magnitude of a detected output voltage by means of a pulse-width modulator to maintain the output voltage constant, characterized in that said pulse-width modulator is provided, by an error amplifier, with an input corresponding to the magnitude of said detected output voltage; and variations in the input applied to the pulse-width modulator for increasing the pulse width of said base input are moderated by means of a time-constant circuit and a circuit for causing said time-constant circuit to be charged and discharged.
Claim 3
Dependent Claim
163 words
A switching regulator of the type wherein a pair of transistors are alternately turned on and off by a base input applied thereto so that a current which is alternately reversed in direction is caused to flow through a primary winding of a main transformer; a voltage induced in a secondary winding of the main transformer is rectified to obtain a DC output; and the pulse width of said base input is controlled in accordance with the magnitude of a detected output voltage by means of a pulse-width modulator to maintain the output voltage constant, characterized in that said pulse-width modulator is provided, by an error amplifier, with an input corresponding to the magnitude of said detected output voltage; and variations in the input applied to the pulse-width modulator for increasing the pulse width of said base input are moderated by means of an emitter-follower circuit connected to the input portion of said pulse-width modulator, a constant current circuit, and a time-constant circuit.
Claim 4
Dependent Claim
163 words
A switching regulator of the type wherein a pair of transistors are alternately turned on and off by a base input applied thereto so that a current which is alternately reversed in direction is caused to flow through a primary winding of a main transformer; a voltage induced in a secondary winding of the main transformer is rectified to obtain a DC output; and the pulse width of said base input is controlled in accordance with the magnitude of a detected output voltage by means of a pulse-width modulator to maintain the output voltage constant, characterized in that said pulse-width modulator is provided, by an error amplifier, with an input corresponding to the magnitude of said detected output voltage; and variations in the input applied to the pulse-width modulator for increasing the pulse width of said base input are moderated by means of an emitter-follower circuit connected to the input portion of said pulse-width modulator, a constant current circuit, and a time-constant circuit.
Claim 5
Dependent Claim
32 words
A switching regulator according to claim 2, wherein said time-constant circuit comprises a series connection of a capacitor and resistor; and said emitter-follower circuit constitutes the output circuit of said error amplifier.
References Cited (Backward Citations)
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US4148097A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |