US4100464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric amplifying arrangements
Assignee: Allard Way Holdings Ltd
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Filing: 1976-08-16
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Granted: 1978-07-11
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Expires: 1996-08-16
Abstract
Abstract An electric amplifying arrangement for supplying current to an inductive load in response to an input signal of saw-tooth waveform, e.g. a deflection amplifier for a cathode ray tube, wherein during the ramp portion of the input voltage a linear relation is maintained between variation in the load current and the input signal (i.e. Class A operation occurs) and, during flyback, energy recovery is provided, thereby providing higher efficiency than is obtained with known Class A saw-tooth amplifiers.
Inventors
- 👤 Charles William Ovenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:25
CPC Classifications
H; H03; H03K; H03K6/00; H03K6/02; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/696
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
230 words
An electric amplifying arrangement for supplying current to an inductive load in response to an input signal of saw-tooth waveform comprising: (A) a first controllable electronic switching device connected between said load and a source of current for said load of one polarity; (B) a second controllable electronic switching device connected between said load and a source of current for said load of the opposite polarity; (C) a first discharge path connected with said load to discharge energy supplied to said load via said first switching device; (D) a second discharge path (i) including a third controllable electronic switching device connected with said load to discharge energy supplied to said load via said second switching device; and (E) control means responsive to said input signal to close said third and first switching devices during consecutive first and second parts of the ramp portion of the input signal respectively, and to close said second switching device during the latter part of the flyback portion of the input signal; (F) said control means so controlling the discharge of energy from the load through the third switching device, and the supply of current to the load through the first switching device, that a linear relation is maintained between the variation in the load current and the input signal during the said first and second parts of the ramp portion of the input signal.
Claim 2
Dependent Claim
230 words
An electric amplifying arrangement for supplying current to an inductive load in response to an input signal of saw-tooth waveform comprising: (A) a first controllable electronic switching device connected between said load and a source of current for said load of one polarity; (B) a second controllable electronic switching device connected between said load and a source of current for said load of the opposite polarity; (C) a first discharge path connected with said load to discharge energy supplied to said load via said first switching device; (D) a second discharge path (i) including a third controllable electronic switching device connected with said load to discharge energy supplied to said load via said second switching device; and (E) control means responsive to said input signal to close said third and first switching devices during consecutive first and second parts of the ramp portion of the input signal respectively, and to close said second switching device during the latter part of the flyback portion of the input signal; (F) said control means so controlling the discharge of energy from the load through the third switching device, and the supply of current to the load through the first switching device, that a linear relation is maintained between the variation in the load current and the input signal during the said first and second parts of the ramp portion of the input signal.
Claim 3
Dependent Claim
46 words
An electric amplifying arrangement according to claim 1, wherein said first discharge path includes a capacitance which receives energy from the load when the first switching device opens, and supplies said energy to said load via said second switching device when said second switching device closes.
Claim 4
Dependent Claim
50 words
An electric amplifying arrangement according to claim 1, wherein said control means includes a differential amplifier which controls the switching potentials applied to the first and third switching devices in dependence upon the input signal, and in dependence upon a negative feedback signal representing the current passing through the load.
Claim 5
Dependent Claim
46 words
An electric amplifying arrangement according to claim 3, wherein the switching potentials applied in operation to said first and third switching devices are derived by a fourth controllable electronic switching device controlled by the output of the differential amplifier to operate as a class A amplifier.
Claim 6
Dependent Claim
130 words
An electric amplifying arrangement according to claim 1, wherein said load has one end connected to a point maintained at a first potential in operation, said first switching device is connected between the other end of the load and a point maintained in operation at a second potential of said one polarity with respect to said first potential; said second switching device is connected between said other end of the load and a point maintained in operation at a third potential of said opposite polarity with respect to said first potential; said third switching device is connected between said other end of the load and a point maintained at said first potential, and said first discharge path incorporates a unidirectional conducting device connected in parallel with said second switching device.
Claim 7
Dependent Claim
16 words
An electric amplifying arrangement according to claim 5, wherein said controllable electronic switching devices are transistors.
Claim 8
Dependent Claim
18 words
An electric amplifying arrangement according to claim 6, wherein said first and second switching devices are NPN transistors.
Claim 9
Dependent Claim
17 words
An electric amplifying arrangement according to claim 7, wherein said first and second switching devices are identical.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |