US3723855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System having fast plural high voltage switching
Assignee: ABB Automation Inc
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Filing: 1971-08-16
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Granted: 1973-03-27
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Expires: 1991-08-16
Abstract
Abstract High voltage DC sources each having a switch for connecting and disconnecting its poles and a switch for connecting and disconnecting one of its poles from itself. Each switch of the former sort is connected in series with the rest thereof, and is open or closed depending respectively whether or not the voltage of the corresponding source is to be utilized. Each switch of the latter type is closed or open depending on, respectively, whether or not the voltage of the corresponding switch is to be utilized. Each source has a zener diode string permanently connected across it. Each switch, likewise, has a diode string connected across it, and is composed of a series of switching transistors, each of which has a diode of the latter diode string connected between its emitter and collector electrodes. The net effect of the diodes is to provide for fast change in voltage level under all conditions. The switching transistors are opto-electronically controlled for adaptation to use in systems like multi-color graphic display systems using beam penetration tubes wherein voltage level switching at high repetition and slewing rates is required, along with good isolation of the high voltage from other potentials, close to ground, in the system.
Inventors
- 👤 P Shuleshko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/10; H03K17/51; H03K17/78; H03K17/795; H03K17/7955; Y; Y10; Y10S; Y10S323/00; Y10S323/902
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
285 words
A switch means for a voltage switching system, said switch means having a first terminal for connection to one side of a DC voltage source, and a second terminal for connection to the other side of said DC voltage source, and including a first diode and a first switch each connected to said first terminal independently of the other; said first switch being of the type which, when on, is conductive only with reSpect to current applied to it for passage through it to said first terminal, and said first diode being oppositely polarized with respect to such conduction of said first switch; and said switch means further including a second switch and a second diode each being connected between said terminals independently of the other, said second switch being of the type which, when on, is conductive only with respect to current applied to it for passage through it from said first terminal to said second terminal, said second diode being oppositely polarized with respect to such conduction of said second switch; and said switch means also including a zener diode connected between said second terminal on the one hand, and both said first switch and said first diode on the other hand, said zener diode being polarized with respect to such connection such that upon sufficient current flowing through said first diode from said first terminal, said zener diode breaks down to conduct said current to said second terminal, said zener diode being connected to said first switch such that said first switch is between said zener diode and said first terminal; said system including control means for, alternately, turning said first switch on and said second switch off, simultaneously, or vice versa.
Claim 2
Dependent Claim
285 words
A switch means for a voltage switching system, said switch means having a first terminal for connection to one side of a DC voltage source, and a second terminal for connection to the other side of said DC voltage source, and including a first diode and a first switch each connected to said first terminal independently of the other; said first switch being of the type which, when on, is conductive only with reSpect to current applied to it for passage through it to said first terminal, and said first diode being oppositely polarized with respect to such conduction of said first switch; and said switch means further including a second switch and a second diode each being connected between said terminals independently of the other, said second switch being of the type which, when on, is conductive only with respect to current applied to it for passage through it from said first terminal to said second terminal, said second diode being oppositely polarized with respect to such conduction of said second switch; and said switch means also including a zener diode connected between said second terminal on the one hand, and both said first switch and said first diode on the other hand, said zener diode being polarized with respect to such connection such that upon sufficient current flowing through said first diode from said first terminal, said zener diode breaks down to conduct said current to said second terminal, said zener diode being connected to said first switch such that said first switch is between said zener diode and said first terminal; said system including control means for, alternately, turning said first switch on and said second switch off, simultaneously, or vice versa.
Claim 3
Dependent Claim
95 words
A voltage switching system having the switch means and control means of claim 1, and including, impedance means for utilizing DC voltage between said terminals, a DC voltage source connected across said zener diode independently of the said switches and of the other said diodes; said zener diode being polarized and rated to withstand the voltage of said source, and said impedance means having the property of being capable of producing a current flowing through said first diode from said first terminal while said first switch is on and said second switch is simultaneously off.
Claim 4
Dependent Claim
28 words
The voltage switching system of claim 2, wherein said impedance means is a display panel requiring the voltage of said source for emitting light of a given color.
Claim 5
Dependent Claim
145 words
A voltage switching system having the switch means and control means of claim 1, and including a first DC voltage source, a second zener diode, and a second DC voltage source; said first DC voltage source being connected across said first zener diode independently of the said switches and of the other said diodes, and said first zener diode being polarized to withstand the voltage of said first DC voltage source; said second DC voltage source being connected at one of its sides to said first terminal for addition of its voltage to the voltage of said first DC source when said first switch and said second switch are simultaneously and respectively on and off, said second DC voltage source also being connected across said second zener diode, and said second zener diode being polarized to withstand the voltage of said second DC voltage source.
Claim 6
Dependent Claim
82 words
The voltage switching system of claim 4 having impedance means connected between said second terminal and the other side of said second DC voltage source for utilization of the voltages of said DC voltage sources in series when said first switch and said second switch are simultaneously and respectively on and off; said impedance means having the property of producing a current breaking down said second zener diode if said first and second switches are simultaneously and respectively turned off and on.
Claim 7
Dependent Claim
58 words
The voltage switching system of claim 5, wherein said impedance means is a display panel requiring a voltage including that of said first and second DC voltage source in series for emitting light of one color, but, for producing light of a different color, requiring such voltage diminished by the voltage of one of said DC voltage sources.
Claim 8
Dependent Claim
68 words
The voltage switching system of claim 4 wherein said second DC voltage source has second switch means, said second switch means being like the first said switch means and connected to said second DC voltage source like said first said switch means is connected to the said first DC voltage source; said second zener diode corresponding to the said first zener diode of said first said switch means.
Claim 9
Dependent Claim
116 words
The voltage switching system of claim 7 having impedance means connected between said second terminal, and a terminal, corresponding to said first terminal, of said second switch means, for utilization of the voltages of said DC voltage sources in series when said first switch, and the corresponding switch of said second switch means, are both on and simultaneously, said second switch, and the corresponding switch of such switch means, are both off; said impedance means having the property of producing a current breaking down said second zener diode if said first and second switches are simultaneously and respectively turned off and on, while the corresponding switches of said second switch means are respectively on and off.
Claim 10
Dependent Claim
56 words
The voltage switching system of claim 8, wherein said impedance means is a display panel requiring a voltage including that of said first and second DC sources in series for emitting light of one color, but, for producing light of a different color, requiring such voltage diminished by the voltage of one of said DC voltage.
Claim 11
Dependent Claim
217 words
Opto-electronically isolated switch means including a first terminal and a first switch for connecting one side of a DC voltage source to said first terminal, said switch means also having a second terminal for direct connection to the other side of said DC voltage source and a second switch interconnecting said first and second terminals; said first switch being first transistor means and having first diode means, said first transistor means and said first diode means providing return paths for current passing to or from a load impedance in series with voltage across said terminals; said second switch being second transistor means and having second diode means, said second transistor means and said first diode means providing return paths for current passing to or from a load impedance in series with the voltage across said terminals; each said transistor means having respective photo-sensitive means for turning same on or off depending on the level of illumination of said photo-sensitive means; and then being control means for controlling illumination of both such photo-sensitive means simultaneously, such that, when the level of illumination with respect to either such photosensitive means suffices to cause the corresponding transistor means to turn on, the level of illumination of the other such photo-sensitive means is insufficient to turn the corresponding transistor means on.
Claim 12
Dependent Claim
217 words
Opto-electronically isolated switch means including a first terminal and a first switch for connecting one side of a DC voltage source to said first terminal, said switch means also having a second terminal for direct connection to the other side of said DC voltage source and a second switch interconnecting said first and second terminals; said first switch being first transistor means and having first diode means, said first transistor means and said first diode means providing return paths for current passing to or from a load impedance in series with voltage across said terminals; said second switch being second transistor means and having second diode means, said second transistor means and said first diode means providing return paths for current passing to or from a load impedance in series with the voltage across said terminals; each said transistor means having respective photo-sensitive means for turning same on or off depending on the level of illumination of said photo-sensitive means; and then being control means for controlling illumination of both such photo-sensitive means simultaneously, such that, when the level of illumination with respect to either such photosensitive means suffices to cause the corresponding transistor means to turn on, the level of illumination of the other such photo-sensitive means is insufficient to turn the corresponding transistor means on.
Claim 13
Dependent Claim
123 words
A voltage switching system including the opto-electronically isolated switch means of claim 10, said system having a third terminal for connection to one side of a second DC voltage source, the last said one side corresponding to the said one side of the first said DC voltage source; said system also having zener diode means interconnecting said first and third terminals, said zener diode means being polarized and rated to withstand the voltage of said second DC voltage source, while breaking down for a voltage across said first and third terminals having the polarity of the voltage of said second DC voltage source but being greater in magnitude, the other side of said second DC voltage source being connected to said first terminal.
Claim 14
Dependent Claim
82 words
The voltage switching system of claim 11, said system having second switch means, said second switch means being like the first said switch means, and there being second control means for controlling said second switch means like the first said control means controls said first said switch means; and the terminals of said second switch means corresponding to the said first and second terminals, respectively of said first said switch means being effectively and respectively said first terminal and said third terminal.
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |