US3586957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power source for electronic circuitry
Assignee: Canadian National Railway Co
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Filing: 1968-08-16
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Granted: 1971-06-22
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Expires: 1988-08-16
Abstract
Abstract Electric power from a 72 v. DC supply is applied through protective elements which reduce the effects of voltage surges and transients on succeeding circuitry to a transistor chopper producing an alternating current output which is preferably transformed and rectified and tapped to provide regulated and unregulated supplies. In one alternative the transformer output is fed back to control the voltage input to the transistor chopper.
Inventors
- 👤 George Robert Cass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1213; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387; H02M3/3388
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
An arrangement for supplying potentials for the operation of electronic circuitry from a railway locomotive power supply comprising: a pair of lines for respective connection to the direct current output terminals of a locomotive; means connected to said lines for eliminating transient voltage changes thereon; means connected to the output of the last-named means for converting the potentials at the said output to an alternating current signal; transformer means for transforming said alternating current; and means for rectifying the output of said transformer means; said arrangement further comprising a transistor having the emitter-collector circuit thereof connected across the input to said converting means such that an increase in current flow through said emitter-collector circuit reduces the potential applied to said converting means and a decrease in current flow through said emitter-collector circuit increases the potential applied to said converting means, a Zener Diode connected in a circuit across the input to said converting means designed to conduct when the potential across said input exceeds a predetermined desired value; and means for biasing said transistor into conduction responsive to conduction in said Zener Diode such that conduction in said Zener Diode limits the potential across said converting means.
Claim 2
Dependent Claim
197 words
An arrangement for supplying potentials for the operation of electronic circuitry from a railway locomotive power supply comprising: a pair of lines for respective connection to the direct current output terminals of a locomotive; means connected to said lines for eliminating transient voltage changes thereon; means connected to the output of the last-named means for converting the potentials at the said output to an alternating current signal; transformer means for transforming said alternating current; and means for rectifying the output of said transformer means; said arrangement further comprising a transistor having the emitter-collector circuit thereof connected across the input to said converting means such that an increase in current flow through said emitter-collector circuit reduces the potential applied to said converting means and a decrease in current flow through said emitter-collector circuit increases the potential applied to said converting means, a Zener Diode connected in a circuit across the input to said converting means designed to conduct when the potential across said input exceeds a predetermined desired value; and means for biasing said transistor into conduction responsive to conduction in said Zener Diode such that conduction in said Zener Diode limits the potential across said converting means.
Claim 3
Dependent Claim
273 words
An arrangement for supplying potentials for the operation of electronic circuitry from a railway locomotive power supply comprising: a pair of lines for respective connection to the direct current output terminals of a locomotive; means connected to said lines for eliminating transient voltage changes thereon; means connected to the output of the last-named means for converting the potentials at said output to alternating current signals; transformer means for transforming said alternating current signals; and means for rectifying the output of said transformer means; said arrangement further comprising a transistor having the emitter-collector circuit thereof connected across the input to said converting means such that an increase in current flow through said emitter-collector circuit reduces the potential applied to said converting means and a decrease in current flow through said emitter-collector circuits increases the potential applied to said converting means, means responsive to the output of said transformer means for controlling the biasing of said transistor, said biasing means biasing said transistor to increase conduction in response to an increased output from said transformer means and to decrease conduction in response to a decreased output from said transformer means, a Zener Diode connected in a circuit across the input to said converting means designed to conduct when the potential across said input exceeds a predetermined desired value, said predetermined desired value being higher than the potential at the input to said converting means when said biasing means acts to reduce the potential applied to said converting means; and means for biasing said transistor into conduction responsive to conduction in said Zener Diode so that said Zener Diode limits the potential across said converting means.
Claim 4
Dependent Claim
273 words
An arrangement for supplying potentials for the operation of electronic circuitry from a railway locomotive power supply comprising: a pair of lines for respective connection to the direct current output terminals of a locomotive; means connected to said lines for eliminating transient voltage changes thereon; means connected to the output of the last-named means for converting the potentials at said output to alternating current signals; transformer means for transforming said alternating current signals; and means for rectifying the output of said transformer means; said arrangement further comprising a transistor having the emitter-collector circuit thereof connected across the input to said converting means such that an increase in current flow through said emitter-collector circuit reduces the potential applied to said converting means and a decrease in current flow through said emitter-collector circuits increases the potential applied to said converting means, means responsive to the output of said transformer means for controlling the biasing of said transistor, said biasing means biasing said transistor to increase conduction in response to an increased output from said transformer means and to decrease conduction in response to a decreased output from said transformer means, a Zener Diode connected in a circuit across the input to said converting means designed to conduct when the potential across said input exceeds a predetermined desired value, said predetermined desired value being higher than the potential at the input to said converting means when said biasing means acts to reduce the potential applied to said converting means; and means for biasing said transistor into conduction responsive to conduction in said Zener Diode so that said Zener Diode limits the potential across said converting means.
Claim 5
Dependent Claim
236 words
An arrangement for supplying potentials for the operation of electronic circuitry from a railway locomotive power supply comprising: a pair of lines for respective connection to the direct current output terminals of a locomotive; means connected to said lines for eliminating transient voltage changes thereon; means connected to the output of the last-named means for converting the potentials at said output to an alternating current signal; transformer means for transforming said alternating current signal; and means for rectifying the output of said transformer means; said arrangement further comprising a transistor coupled to said means for eliminating transient voltages and having the collector-emitter circuit thereof connected across one output of said transformer, rectifier means connected across said one output of said transformer means for rectifying the output of said transformer means and means for producing a voltage datum connected across said one output of said transformer means, means for connecting the rectified output of said rectifier means to ground through the series combination of a Zener Diode and a resistance, said Zener Diode being designed to be continuously conducting with the design voltage drop thereacross, and means responsive to the potential of said Zener Diode at the end thereof remote from said voltage datum for controlling the potential at the base of said transistor, the potential applied from said transformer means to the collector-emitter circuit of said transistor being selected so that said transistor is continuously conducting.
Claim 6
Dependent Claim
236 words
An arrangement for supplying potentials for the operation of electronic circuitry from a railway locomotive power supply comprising: a pair of lines for respective connection to the direct current output terminals of a locomotive; means connected to said lines for eliminating transient voltage changes thereon; means connected to the output of the last-named means for converting the potentials at said output to an alternating current signal; transformer means for transforming said alternating current signal; and means for rectifying the output of said transformer means; said arrangement further comprising a transistor coupled to said means for eliminating transient voltages and having the collector-emitter circuit thereof connected across one output of said transformer, rectifier means connected across said one output of said transformer means for rectifying the output of said transformer means and means for producing a voltage datum connected across said one output of said transformer means, means for connecting the rectified output of said rectifier means to ground through the series combination of a Zener Diode and a resistance, said Zener Diode being designed to be continuously conducting with the design voltage drop thereacross, and means responsive to the potential of said Zener Diode at the end thereof remote from said voltage datum for controlling the potential at the base of said transistor, the potential applied from said transformer means to the collector-emitter circuit of said transistor being selected so that said transistor is continuously conducting.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |