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Patent US3566148A successfully refreshed from Google Patents.
US3566148A
Expired / Lapsed
US
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Selective phase angle pulse generating circuit
Assignee: ELGAR ELECTRONICS Corp A CORP OF
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Filing: 1968-02-14
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Granted: 1971-02-23
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Expires: 1988-02-14
Abstract
Abstract The present disclosure relates to circuitry for generating an output pulse at a selected phase angle with respect to an alternating signal independent of the amplitude and frequency thereof. The circuit is ideally adapted for use in induction heating apparatus employing an inverter drive including controlled switching devices operative to supply an alternating signal to a tuned load including an induction heating coil. The circuit is operative to generate the output pulse by detecting, through peak detection for example, the substantial peak of the alternating signal and comparing, through an active device for example, a selected portion of the peak value with the instantaneous value of the alternating signal. An output pulse at the selected phase angle is provided when the compared signals bear a predetermined relationship with respect to each other.
Inventors
- 👤 Peter Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:39
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/523; H02M7/5233; H03K5/00; H03K5/13; H03K5/135
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
88 words
A circuit for providing an output signal at a selected phase angle with respect to an alternating signal which may vary in amplitude and frequency coMprising: means for peak detecting a portion of said alternating signal and providing a detected signal proportional to the substantial peak amplitude of said alternating signal; and means for comparing said detected signal with the instantaneous value of said alternating signal and providing said output signal when said detected signal and said instantaneous value bear a predetermined relationship with respect to each other.
Claim 2
Dependent Claim
88 words
A circuit for providing an output signal at a selected phase angle with respect to an alternating signal which may vary in amplitude and frequency coMprising: means for peak detecting a portion of said alternating signal and providing a detected signal proportional to the substantial peak amplitude of said alternating signal; and means for comparing said detected signal with the instantaneous value of said alternating signal and providing said output signal when said detected signal and said instantaneous value bear a predetermined relationship with respect to each other.
Claim 3
Dependent Claim
55 words
The circuit of claim 1 wherein: said detected signal being proportional to the substantial peak magnitude of each half-cycle of said alternating signal, and said means for comparing being operative to provide said output signal during each half-cycle at said selected phase angle after the peak magnitude has been reached and said predetermined relationship exists.
Claim 4
Dependent Claim
33 words
The circuit of claim 2 wherein: said means for detecting including a storage element for storing said detected signal and a unidirectional device for maintaining said detected signal until said predetermined relationship exists.
Claim 5
Dependent Claim
55 words
The circuit of claim 3 wherein: said means for comparing including a comparison stage for receiving said detected signal at one input thereof and said instantaneous value at another input thereof to provide said output signal at an output thereof in response to the comparison of said inputs to said stage bearing said predetermined relationship.
Claim 6
Dependent Claim
45 words
The circuit of claim 4 including: means for full wave rectifying said alternating signal; and means for supplying a selected portion of the full wave rectified alternating signal to said means for detecting, said means for supplying being adjustable to vary said selected phase angle.
Claim 7
Dependent Claim
58 words
The circuit of claim 5 wherein: said comparison stage including an active device for receiving said detected signal across a first pair of electrodes thereof and said instantaneous value across a second pair of electrodes thereof and providing said output signal at one of said electrodes when said instantaneous value reaches a predetermined fraction of said detected signal.
Claim 8
Dependent Claim
52 words
The circuit of claim 6 wherein: said storage element comprising a capacitor and said unidirectional device comprising a diode, said diode operatively connected between said means for supplying and said capacitor, said capacitor operatively connected across said first pair of electrodes of said active device, said active device comprising a unijunction transistor.
Claim 9
Dependent Claim
147 words
In induction heating apparatus utilizing an inverter having a plurality of controlled switching devices for supplying an alternation signal to a tuned load, the combination of: means for sensing said alternating signal developed across said load; a pulse generating circuit for providing an output signal at a selected phase angle with respect to said alternating signal and comprising, means for peak detecting a portion of said alternating signal and providing a detected signal proportional to the substantial peak magnitude of said alternating signal, and means for comparing said detected signal with the instantaneous value of said alternating signal and providing said output signal when said detected signal and said instantaneous value bear a predetermined relationship with respect to each other; and means for utilizing said output pulse from said pulse generating circuit for controlling the switched state of said plurality for controlled switching devices of said inverter.
Claim 10
Dependent Claim
147 words
In induction heating apparatus utilizing an inverter having a plurality of controlled switching devices for supplying an alternation signal to a tuned load, the combination of: means for sensing said alternating signal developed across said load; a pulse generating circuit for providing an output signal at a selected phase angle with respect to said alternating signal and comprising, means for peak detecting a portion of said alternating signal and providing a detected signal proportional to the substantial peak magnitude of said alternating signal, and means for comparing said detected signal with the instantaneous value of said alternating signal and providing said output signal when said detected signal and said instantaneous value bear a predetermined relationship with respect to each other; and means for utilizing said output pulse from said pulse generating circuit for controlling the switched state of said plurality for controlled switching devices of said inverter.
Claim 11
Dependent Claim
55 words
The combination of claim 8 wherein: said detected signal being proportional to the substantial peak magnitude of each half-cycle of said alternating signal, and said means for comparing being operative to provide said output signal during each half-cycle at said selected phase angle after the peak magnitude has been reached and said predetermined relationship exists.
Claim 12
Dependent Claim
35 words
The combination of claim 9 wherein: said means for detecting including a storage element for storing said substantial peak magnitude and a unidirEctional device for maintaining said substantial peak magnitude until said predetermined relationship exists.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |