Patent US4722041A successfully refreshed from Google Patents.
US4722041A
Expired / Lapsed
US
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Switching regulator
Assignee: Toko Inc
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Filing: 1986-10-28
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Granted: 1988-01-26
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Expires: 2006-10-28
Abstract
Abstract An on-on type switching regulator comprises a blocking oscillator, rectifying-smoothing circuit, and a voltage drop circuit. The blocking oscillator includes a transformer having a collector winding, base winding and secondary winding, and a transistor. The rectifying-smoothing circuit comprises a rectifier diode, flywheel diode, choke coil, and smoothing capacitor, and is connected to the secondary winding. The voltage drop circuit is connected in a closed circuit which is formed between the base winding and the base-emitter of said transistor, said voltage drop circuit being arranged to block any forward or backward current when the voltage thereacross is in a micro-voltage range which may occur before excitation energy in the choke coil is discharged.
Inventors
- 👤 Hiroichi Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:54
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
An on-on type switching regulator comprising: a blocking oscillator including a transformer having a collector winding, base winding and secondary winding, and a transistor; a rectifying-smoothing circuit comprising a rectifier diode, flywheel diode, choke coil, and smoothing capacitor, said rectifying-smoothing circuit being connected to said secondary winding; and a voltage drop circuit connected in a closed circuit formed between said base winding and the base-emitter of said transistor, said voltage drop circuit being arranged to block any forward or backward current when the voltage thereacross is in a micro-voltage range which may occur before excitation energy in said choke coil is discharged.
Claim 2
Dependent Claim
102 words
An on-on type switching regulator comprising: a blocking oscillator including a transformer having a collector winding, base winding and secondary winding, and a transistor; a rectifying-smoothing circuit comprising a rectifier diode, flywheel diode, choke coil, and smoothing capacitor, said rectifying-smoothing circuit being connected to said secondary winding; and a voltage drop circuit connected in a closed circuit formed between said base winding and the base-emitter of said transistor, said voltage drop circuit being arranged to block any forward or backward current when the voltage thereacross is in a micro-voltage range which may occur before excitation energy in said choke coil is discharged.
Claim 3
Dependent Claim
48 words
A switching regulator according to claim 1, wherein said voltage drop circuit includes two series circuits each comprising a diode and resistor, said two series circuits being connected in parallel with each other in such a manner that the diodes are connected in reverse polarity with each other.
Claim 4
Dependent Claim
49 words
A switching regulator according to claim 1, wherein the collector current of the transistor constituting said blocking oscillator is transformed to a voltage by means of a current transformer, and when positive component of the voltage resulting from the transformation exceeds a reference voltage, said transistor is turned off.
Claim 5
Dependent Claim
49 words
A switching regulator according to claim 2, wherein the collector current of the transistor constituting said blocking oscillator is transformed to a voltage by means of a current transformer, and when positive component of the voltage resulting from the transformation exceeds a reference voltage, said transistor is turned off.
References Cited (Backward Citations)
US153463A
Cited
US4207478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |