US3621134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low b{30 {0 start circuit for line-operated receiver
Assignee: Philips North America LLC
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Filing: 1969-03-17
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Granted: 1971-11-16
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Expires: 1989-03-17
Abstract
Abstract A switching transistor is provided for a solid-state lineoperated television receiver which allows the low B+ voltage requirements of the receiver to initially be supplied from the high B+ through the turned-on switch transistor and subsequently on switching of the transistor to its nonconductive state, the low B+ requirements of the receiver are met by rectifying the horizontal flyback transformer voltage pulse.
Inventors
- 👤 Richard J Waring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:16
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H03K4/64; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
175 words
In a line-operated television receiver having both high and low B+ voltage requirements, a low B+ starting circuit comprising: a source of high B+ voltage within said television receiver; a switching transistor having a base emitter and collector; a first resistance coupled between said collector and said source of high B+ voltage; a second resistance coupled between said base and said source of high B+ voltage; voltage-regulating means coupled between said base and ground for maintaining the potential difference between said base and ground at a relatively fixed value whereby the switching of said transistor is controlled by the potential difference between said emitter and ground; and a source of low B+ voltage within said television receiver coupled to said emitter and requiring initial low B+ voltage in order to provide low B+ voltage, said initial low B+ voltage requirements being provided from said high B+ voltage source when said switching transistor is conductive, said switching transistor switching to its nonconductive state when the potential difference between ground and said emitter exceeds a predetermined value.
Claim 2
Dependent Claim
175 words
In a line-operated television receiver having both high and low B+ voltage requirements, a low B+ starting circuit comprising: a source of high B+ voltage within said television receiver; a switching transistor having a base emitter and collector; a first resistance coupled between said collector and said source of high B+ voltage; a second resistance coupled between said base and said source of high B+ voltage; voltage-regulating means coupled between said base and ground for maintaining the potential difference between said base and ground at a relatively fixed value whereby the switching of said transistor is controlled by the potential difference between said emitter and ground; and a source of low B+ voltage within said television receiver coupled to said emitter and requiring initial low B+ voltage in order to provide low B+ voltage, said initial low B+ voltage requirements being provided from said high B+ voltage source when said switching transistor is conductive, said switching transistor switching to its nonconductive state when the potential difference between ground and said emitter exceeds a predetermined value.
Claim 3
Dependent Claim
34 words
The combination of claim 1 wherein the voltage regulating means is a Zener diode so connected as to give a regulated voltage drop somewhat less than the low B+ voltage requirements of the receiver.
Claim 4
Dependent Claim
22 words
The combination of claim 1 wherein the resistance of said first resistance is substantially less than the resistance of said second resistance.
Claim 5
Dependent Claim
83 words
In a line-operated receiver having both high and low B+ voltage requirements, the combination comprising: first means for providing the high B+ voltage; voltage divider means coupled to said first means for initially supplying the low B+ voltage requirements; second means, requiring low B+ voltage, for providing low B+ voltage; and switch means responsive to the second means for initially enabling said voltage divider means and subsequently rendering inoperative the voltage divider means when said second means is fulfilling the low B+ requirements.
Claim 6
Dependent Claim
83 words
In a line-operated receiver having both high and low B+ voltage requirements, the combination comprising: first means for providing the high B+ voltage; voltage divider means coupled to said first means for initially supplying the low B+ voltage requirements; second means, requiring low B+ voltage, for providing low B+ voltage; and switch means responsive to the second means for initially enabling said voltage divider means and subsequently rendering inoperative the voltage divider means when said second means is fulfilling the low B+ requirements.
Claim 7
Dependent Claim
38 words
The combination of claim 4 wherein the switch means is connected in series with said voltage divider means and comprises a switching transistor which is initially conducting and which becomes nonconducting to render inoperative the voltage divider means.
Claim 8
Dependent Claim
63 words
The combination of claim 5 wherein said switching transistor has a base collector and emitter further comprising: voltage-regulating means for maintaining the base of said switching transistor at a fixed potential with respect to ground whereby said transistor is conductive when the emitter potential is less than that of the base and is nonconductive when the emitter potential exceeds that of the base.
Claim 9
Independent Claim
75 words
The method of providing temporary low B+ voltage to start a low B+ generating system in a line operated receiver comprising the steps of: initially providing a high B+ voltage; starting the low B+ generating system with a portion of the available high B+ voltage; switching from the portion of the high B+ voltage to the low B+ generating system when the low B+ voltage becomes available, thus providing a self-sustaining low B+ generating system.
Claim 10
Independent Claim
75 words
The method of providing temporary low B+ voltage to start a low B+ generating system in a line operated receiver comprising the steps of: initially providing a high B+ voltage; starting the low B+ generating system with a portion of the available high B+ voltage; switching from the portion of the high B+ voltage to the low B+ generating system when the low B+ voltage becomes available, thus providing a self-sustaining low B+ generating system.
Claim 11
Dependent Claim
105 words
In a line-operated television receiver having both high and low B+ voltage requirements, a low B+ starting circuit comprising: a source of high B+ voltage; a switching transistor having a base emitter and collector; a first resistance coupled between said collector and said source of high B+ voltage; a second resistance coupled between said base and said source of high B+ voltage; voltage-regulating means coupled between said base and ground; and a source of low B+ voltage coupled to said emitter and comprising a capacitor and a horizontal flyback voltage system, said emitter being coupled to said horizontal flyback voltage system and to said capacitor.
Claim 12
Dependent Claim
105 words
In a line-operated television receiver having both high and low B+ voltage requirements, a low B+ starting circuit comprising: a source of high B+ voltage; a switching transistor having a base emitter and collector; a first resistance coupled between said collector and said source of high B+ voltage; a second resistance coupled between said base and said source of high B+ voltage; voltage-regulating means coupled between said base and ground; and a source of low B+ voltage coupled to said emitter and comprising a capacitor and a horizontal flyback voltage system, said emitter being coupled to said horizontal flyback voltage system and to said capacitor.
Claim 13
Dependent Claim
46 words
The combination of claim 1, wherein the switching transistor is initially biased by the voltage regulating means to be in a conducting state and is subsequently forced to a nonconducting state by the build up of the low B+ voltage in said horizontal flyback voltage system.
References Cited (Backward Citations)
GB1041370A
Cited
US3461232A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |