EP0124864A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power control apparatus with optical isolation feedback means
Assignee: Dentsply Sirona Inc
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Filing: 1984-05-02
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Granted: —
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Expires: 2004-05-02
Abstract
Abstract The invention comprises transformerless power supply apparatus particularly adapted for supplying regulated power to critically sensitive loads such as tungsten lamp filament loads of designed power rating. Power control is achieved by a triggered triac in series with the load, and regulation is provided by a feedback circuit, voltage or current, which generates the triac trigger signal periodically as a function of the load voltage or current. The feedback circuit is provided with a photo isolatorfor eliminating premature triggering of the triac due to transients. A timing circuit is also provided for timing the power on condition, the output of which is photo isolator coupled to the triac feedback circuit.
Inventors
- 👤 Donald I. Gonser
- 👤 Duane E. Barber
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 12:40
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455; H05B39/00; H05B39/04; H05B39/08; H05B39/083
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
Transformerless power supply apparatus, comprising source means for providing AC power from a power line, load output terminals, in a series circuit across said source means, for outputting power to a load, switching means in series with said load output for switching on and off, said switching means having a trigger input and a characteristic of being normally a substantial open circuit and a substantial short circuit when triggered to a conducting state, and trigger means for developing a trigger pulse at its output, having a feedback circuit connected to said load and an output connected to said trigger input, said feedback circuit including a photo isolator circuit with response characteristics for following power line variations without transmitting transients.
Claim 2
Dependent Claim
119 words
Transformerless power supply apparatus, comprising source means for providing AC power from a power line, load output terminals, in a series circuit across said source means, for outputting power to a load, switching means in series with said load output for switching on and off, said switching means having a trigger input and a characteristic of being normally a substantial open circuit and a substantial short circuit when triggered to a conducting state, and trigger means for developing a trigger pulse at its output, having a feedback circuit connected to said load and an output connected to said trigger input, said feedback circuit including a photo isolator circuit with response characteristics for following power line variations without transmitting transients.
Claim 3
Dependent Claim
14 words
The apparatus as described in claim 1, wherein said switching means comprises a triac.
Claim 4
Dependent Claim
19 words
The apparatus as described in claim 2, wherein said trigger means comprises a triac firing angle control circuit IC.
Claim 5
Dependent Claim
24 words
The apparatus as described in claim 3, wherein said trigger means is synchronized with the zero crossing of the voltage of said power line.
Claim 6
Dependent Claim
24 words
The apparatus as described in claim 1, wherein said source means comprises magnetic means for filtering high frequency signals carried by the power line.
Claim 7
Dependent Claim
33 words
The apparatus as described in claim 4, wherein said triac firing angle control circuit IC has a trigger level input pin, and said feedback circuit has an output connected to said input pin.
Claim 8
Dependent Claim
35 words
The apparatus as described in claim 6, further comprising timing means for generating timing signals, and second photo isolator coupling means for coupling the output of said timing means to said trigger level input pin.
Claim 9
Dependent Claim
125 words
Power supply apparatus adapted to receive power from a power line and for supplying timed regulated power to a load, comprising: a two state switching device having input means for receiving a switching trigger input; trigger generator means for deriving said trigger input from variations of said power line and delivering it to said switching device, said trigger generator means having a first photo isolator circuit for isolating transients from said trigger input; a timing circuit which generates a timing signal for timing periods of power delivery to said load; and coupling means for coupling said timing signal to said trigger generator means to enable or disable same, said coupling means comprising a second photo isolator circuit for isolating transients from said trigger generator means.
Claim 10
Dependent Claim
125 words
Power supply apparatus adapted to receive power from a power line and for supplying timed regulated power to a load, comprising: a two state switching device having input means for receiving a switching trigger input; trigger generator means for deriving said trigger input from variations of said power line and delivering it to said switching device, said trigger generator means having a first photo isolator circuit for isolating transients from said trigger input; a timing circuit which generates a timing signal for timing periods of power delivery to said load; and coupling means for coupling said timing signal to said trigger generator means to enable or disable same, said coupling means comprising a second photo isolator circuit for isolating transients from said trigger generator means.
References Cited (Backward Citations)
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