US3881135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boost regulator with high voltage protection
Assignee: RCA Licensing Corp
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Filing: 1974-01-31
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Granted: 1975-04-29
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Expires: 1994-01-31
Abstract
Abstract A bosted B+ regulator in a horizontal deflection system comprises a controlled rectifier coupled to a winding in the deflection system for rectifying voltage generated therein and adding it to the line-rectified voltage for providing a constant boost voltage for operation of the deflection system in the presence of line voltage fluctuations. A zener diode is coupled between the rectified line voltage and the rectified boost voltage and to a control electrode of a switching device such as an SCR. Normal deflection system starting current is coupled through a junction of the SCR and through the zener diode in the forward direction. When the boost voltage exceeds a predetermined level, the zener diode breaks down, causing the SCR to conduct which in turn provides a short circuit across the rectifier and its associated winding for disabling operation of the deflection system.
Inventors
- 👤 Wolfgang Friedrich Wilhe Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:54
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/20; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/085
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
227 words
A boost voltage regulator providing high voltage protection for a deflection system, comprising: switching means operable from a first to a second state during each deflection interval for supplying scanning current to a deflection winding of said deflection system; a source of direct current voltage; a boost voltage regulator circuit coupled to said source of voltage and to said switching means, said regulator including controllable rectifying means for rectifying voltage generated in said switching means and adding the rectified voltage to said direct current voltage for providing a regulated boost voltage for said switching means; an active current conducting device having its main conduction path coupled to said source of direct current voltage and a terminal of said rectifying means providing said boost voltage; and a zener diode coupled to said terminal providing said boost voltage and a control electrode of said active current conducting device and poled for conducting current in the forward direction from said source through a junction of said active device for providing initial operating current to said switching means, said zener diode having a breakdown voltage characteristic such that when said boost voltage exceeds said source voltage by a predetermined amount said zener conducts in the reverse direction, causing said active device to conduct for providing a relatively low impedance path between said source and said terminal for lowering said boost voltage.
Claim 2
Dependent Claim
227 words
A boost voltage regulator providing high voltage protection for a deflection system, comprising: switching means operable from a first to a second state during each deflection interval for supplying scanning current to a deflection winding of said deflection system; a source of direct current voltage; a boost voltage regulator circuit coupled to said source of voltage and to said switching means, said regulator including controllable rectifying means for rectifying voltage generated in said switching means and adding the rectified voltage to said direct current voltage for providing a regulated boost voltage for said switching means; an active current conducting device having its main conduction path coupled to said source of direct current voltage and a terminal of said rectifying means providing said boost voltage; and a zener diode coupled to said terminal providing said boost voltage and a control electrode of said active current conducting device and poled for conducting current in the forward direction from said source through a junction of said active device for providing initial operating current to said switching means, said zener diode having a breakdown voltage characteristic such that when said boost voltage exceeds said source voltage by a predetermined amount said zener conducts in the reverse direction, causing said active device to conduct for providing a relatively low impedance path between said source and said terminal for lowering said boost voltage.
Claim 3
Dependent Claim
32 words
A boost voltage regulator according to claim 1 wherein said active current conducting device comprises a silicon controlled rectifier passing said initial operating current through its cathode-gate junction to said zener diode.
Claim 4
Dependent Claim
66 words
A boost voltage regulator according to claim 2 wherein said controllable rectifying means has one terminal of its main conduction path inductively coupled to said switching means for receiving alternating current voltage therefrom and the other terminal direct current coupled to said switching means and to sAid active current conducting device, said rectifying means and said active device being oppositely poled with respect to each other.
Claim 5
Dependent Claim
37 words
A boost voltage regulator according to claim 3 wherein a capacitor is coupled in parallel with said rectifying means and said active device for charging to the voltage difference between said boost voltage and said source voltage.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |