EP0264135A2
Expired / Lapsed
EP
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Power supply system for discharge load
Assignee: Toshiba Corp
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Filing: 1987-10-15
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Granted: —
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Expires: 2007-10-15
Abstract
Abstract A power supply system for discharge loads comprising a direct current source (11, 12, 13), inverter means (14) for converting the direct current supplied from the direct current source into an alternating current, current transformer means (15A, 15B, 15C) for transforming the alternating current derived from the inverter means at a predetermined level and delivering it to the discharge load (17A, 17B, 17C) and current control means (20, 21, 22, 23) for controlling the output current from the direct current source at a predetermined level. The discharge power is supplied not from the voltage source but from the current source through the current tranformer so that stabilized and well balanced discharge currents can be supplied to a plurality of discharge loads.
Inventors
- 👤 Mitsuhiro Shibata
- 👤 Osamu Tanaka
- 👤 Teruo Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 19:07
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3376; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
A power supply system for a discharge load characterized by: a direct current source (11; 12, 12A, 12B, 12C, 12D; 13, 13A, 13B; 31A, 31B; 32A, 32B, 32C, 32D) inverter means (14; 14A, 14B) for converting the direct current supplied from said direct current source into an alternating current; current transformer means (15A, 15B, 15C; 36A, 36B, 36C, 36D) for transforming the alternating current derived from said inverter means at a desired level and supplying it to the discharge load; and current control means (20, 21, 22, 23) for controlling the output current derived from said direct current source at a desired level.
Claim 2
Dependent Claim
103 words
A power supply system for a discharge load characterized by: a direct current source (11; 12, 12A, 12B, 12C, 12D; 13, 13A, 13B; 31A, 31B; 32A, 32B, 32C, 32D) inverter means (14; 14A, 14B) for converting the direct current supplied from said direct current source into an alternating current; current transformer means (15A, 15B, 15C; 36A, 36B, 36C, 36D) for transforming the alternating current derived from said inverter means at a desired level and supplying it to the discharge load; and current control means (20, 21, 22, 23) for controlling the output current derived from said direct current source at a desired level.
Claim 3
Dependent Claim
61 words
A power supply system as set forth in Claim 1, characterized in that said direct current source comprises an alternating current source (11), rectifier means (12; 12A, 12B; 12C, 12D) for rectifying the alternating current derived from said alternating current source and reactor means (13; 13A, 13B; 32A, 32B, 32C, 32D) connected in series to the output of said rectifier means.
Claim 4
Dependent Claim
47 words
A power supply system as set forth in Claim 1, characterized in that said direct current source is provided with a plurality of direct current source units whose outputs are connected in parallel with each other through reverse-current blocking diode means (18A, 18B; 34A, 34B, 34C, 34D).
Claim 5
Dependent Claim
52 words
A power supply system as set forth in Claim 3, characterized in that at least one of said plurality of direct current source units has its output connected to shunt switching means (19A, 19B; 35A, 35B) for shunting on the side of the power source side of said reverse-current blocking diode means.
Claim 6
Dependent Claim
45 words
A power supply system as set forth in Claim 1, characterized in that said discharge load is a direct current discharge tube, further comprising rectifier means (16A, 16B, 16C; 37A, 37B, 37C, 37D) interconnected between said current transformer means and said direct current discharge tube.
Claim 7
Dependent Claim
21 words
A power supply system as set forth in Claim 1, characterized in that said inverter means are current type inverter means.
Claim 8
Dependent Claim
136 words
A power supply system for discharge loads characterized by: a direct current source (11; 12, 12A, 12B, 12C, 12D; 13, 13A, 13B; 31A, 31B; 32A, 32B, 32C, 32D); inverter means (14; 14A, 14B) for converting the direct current supplied from said direct current source into an alternating current; current transformer means (15A, 15B, 15C; 36A, 36B, 36C, 36D) for transforming the alternating current derived from said inverter means at a desired level; and current control means (20, 21, 22, 23) for controlling the output current derived from said direct current source at a desired level, said current transformer means comprising a plurality of secondary windings, said secondary windings having a common primary current on the output side of said inverter means and each of said secondary windings being connected to one of said discharge loads, respectively.
Claim 9
Dependent Claim
136 words
A power supply system for discharge loads characterized by: a direct current source (11; 12, 12A, 12B, 12C, 12D; 13, 13A, 13B; 31A, 31B; 32A, 32B, 32C, 32D); inverter means (14; 14A, 14B) for converting the direct current supplied from said direct current source into an alternating current; current transformer means (15A, 15B, 15C; 36A, 36B, 36C, 36D) for transforming the alternating current derived from said inverter means at a desired level; and current control means (20, 21, 22, 23) for controlling the output current derived from said direct current source at a desired level, said current transformer means comprising a plurality of secondary windings, said secondary windings having a common primary current on the output side of said inverter means and each of said secondary windings being connected to one of said discharge loads, respectively.
Claim 10
Dependent Claim
61 words
A power supply system as set forth in Claim 7, characterized in that said direct current source comprises an alternating current source (11), rectifier means (12; 12A, 12B; 12C, 12D) for rectifying the alternating current derived from said alternating current source and reactor means (13; 13A, 13B; 32A, 32B, 32C, 32D) connected in series to the output of said rectifier means.
Claim 11
Dependent Claim
47 words
A power supply system as set forth in Claim 7, characterized in that said direct current source is provided with a plurality of direct current source units whose outputs are connected in parallel with each other through reverse-current blocking diode means (18A, 18B; 34A, 34B, 34C, 34D).
Claim 12
Dependent Claim
52 words
A power supply system as set forth in Claim 9, characterized in that at least one of said plurality of direct current source units has its output connected to shunt switching means (19A, 19B; 35A, 35B) for shunting on the side of the power source side of said reverse-current blocking diode means.
Claim 13
Dependent Claim
36 words
A power supply system as set forth in Claim 9, characterized in that said current transformer means comprise a plurality of two-winding current transformers and the primary windings of said current transformers are connected in series.
Claim 14
Dependent Claim
29 words
A power supply system as set forth in Claim 7, characterized in that said plurality of secondary windings of said current transformer means are mounted on a common core.
Claim 15
Dependent Claim
44 words
A power supply system as set forth in Claim 7, characterized in that said discharge loads are direct current discharge tubes, further comprising rectifier (16A, 16B, 16C; 37A, 37B, 37C, 37D) means interconnected between said current transformer means and said direct current discharge tubes.
Claim 16
Dependent Claim
21 words
A power supply system as set forth in Claim 7, characterized in that said inverter means are current type inverter means.
Claim 17
Dependent Claim
51 words
A power supply system as set forth in Claim 7, characterized in that said inverter means include a plurality of inverters connected in parallel to said direct current source and the output side of each of said plurality of inverters is connected through a current transformer to a discharge load, respectively.
References Cited (Backward Citations)
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