US3600666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching regulator power supply including fast turnoff means for switching transistor
Assignee: HP Inc
•
Filing: 1970-03-19
•
Granted: 1971-08-17
•
Expires: 1990-03-19
Abstract
Abstract A pulse transformer is added to a switching regulator power supply by placing its primary in series with the commutating diode and its secondary between the emitter and the base of the switching transistor through a bias resistor. When the switching transistor starts to turn off, a pulse from the transformer helps turn off the switching transistor faster by removing the stored charge from the base, thus reducing power dissipation in the transistor.
Inventors
- 👤 John H Gliever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:29
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
In an electronic apparatus including: a signal source: a switching means connected in series with the signal source and having a control input to govern the conductivity of the switching means: an inductor connected in series with the switching means: a load connected in series with the inductor and the signal source: and a unidirectional conducting device connected in parallel with the series combination of the inductor and the load: an improvement comprising: a transformer having a primary and a secondary winding, the primary winding of the transformer being connected to the unidirectional conducting device for sensing changes in the current flowing through the unidirectional conducting device: and the secondary winding of the transformer being connected between the switching means control input and the junction between the switching means and the inductor for applying a signal to said control input to alter the conductivity of the switching means in response to a change in the current flowing through the unidirectional conducting device.
Claim 2
Dependent Claim
162 words
In an electronic apparatus including: a signal source: a switching means connected in series with the signal source and having a control input to govern the conductivity of the switching means: an inductor connected in series with the switching means: a load connected in series with the inductor and the signal source: and a unidirectional conducting device connected in parallel with the series combination of the inductor and the load: an improvement comprising: a transformer having a primary and a secondary winding, the primary winding of the transformer being connected to the unidirectional conducting device for sensing changes in the current flowing through the unidirectional conducting device: and the secondary winding of the transformer being connected between the switching means control input and the junction between the switching means and the inductor for applying a signal to said control input to alter the conductivity of the switching means in response to a change in the current flowing through the unidirectional conducting device.
Claim 3
Dependent Claim
35 words
An electronic apparatus as in claim 1 wherein: the switching means is a transistor having a base electrode, there being a signal path between the base and the secondary, the base forming the control input.
Claim 4
Dependent Claim
26 words
An electronic apparatus as in claim 2 wherein: the signal source is a source of DC power and the apparatus is a switching regulator power supply.
Claim 5
Dependent Claim
19 words
A switching regulator power supply as in claim 3 wherein: there is a capacitor in parallel with the load.
Claim 6
Dependent Claim
22 words
A switching regulator power supply as in claim 3 wherein: the signal path between the base and the secondary is a resistor.
Claim 7
Dependent Claim
24 words
A switching regulator power supply as in claim 3 wherein: a variable pulse width pulse generator supplies a control signal to the control input.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |