EP0660487A2
Expired / Lapsed
EP
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Power supply system
Assignee: Hitachi Ltd
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Filing: 1994-12-21
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Granted: —
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Expires: 2014-12-21
Abstract
Abstract A power supply system comprises plural converters being connected in parallel. Each of the current of plural converters is detected and each of the converters is controlled so as to match each of the converters to a maximum current value from among the detected current values. In the parallel operation converters, when some converter having an output current of zero by an accident is included, the remaining converters be partially charged equally a load current. Since a common bus is arranged between plural converters and plural loads, it is possible to carry out a redundant operation having a high reliability. Since a stable output can be obtained without affects by the fault converter, the power supply system having the redundancy and the high reliability can be attained.
Inventors
- 👤 Tadashi Takahashi
- 👤 Kenichi Onda
- 👤 Akihiko Kanouda
- 👤 Masayoshi Sato
- 👤 Hideaki Horie
- 👤 Katsunori Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:47
CPC Classifications
H; H02; H02J; H02J1/00; H02J1/10; H02J1/102; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/577; H02J1/108
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
140 words
In a power supply system having plural converters selected one from plural AC/DC converters for converting the alternative current to the direct current having a predetermined voltage and plural DC/DC converters for converting the direct current to the direct current having a predetermined voltage, outputs of said selected converters are connected in parallel and the electric power is supplied to a load, wherein the power supply system comprises: a current value detection means for detecting output current values of said selected converters; a maximum current value detection means for detecting a maximum output current value among said detected output current values of said selected converters obtained through said current value detection means; and a control means for controlling said selected converters so as to match said detected output current values of said selected converters to said maximum output current value.
Claim 2
Dependent Claim
54 words
A power supply system according to claim 1, wherein the power supply system comprises further, a voltage value control means for detecting output voltage values of said selected converters and for controlling said output voltage values of said selected converters to have predetermined values of said detected output voltage values of said selected converters.
Claim 3
Dependent Claim
79 words
A power supply system according to claim 2, wherein said voltage value control means comprises a comparison means for comparing said detected maximum output current value of said selected converters with said output current values of said selected converters, and each of said output voltage values of said selected converters is controlled so as to lessen a difference part between said maximum output current value of said selected converter and said detected output current value of said selected converter.
Claim 4
Dependent Claim
158 words
A power supply system according to claim 3, wherein said selected converter is constituted by using a transformer so as to convert the alternative current to the direct current having a predetermined voltage or to convert the direct current to the direct current having a predetermined voltage, the power supply system comprises further, a current value detection means for detecting a current value flowing in a secondary coil of said transformer; a respective current value detection circuit for detecting a direct current output current value of said respective selected converter; a maximum current value detection circuit for comparing current values from said respective current value detection means of said respective selected converter and for detecting a maximum current value among said compared current values; and an addition means for adding a difference part between said maximum current value of said respective selected converter and said output current value of said respective selected converter to said voltage control means.
Claim 5
Dependent Claim
120 words
A power supply system, wherein an alternative current power supply is connected to a first common bus; by obtaining an alternative current input from said first common bus plural rectifying means for converting the alternative current to the direct current are arranged; direct current outputs of said rectifying means are connected to a second common bus; by obtaining a direct current input from said second common bus plural DC/DC converters for converting the alternative current to the direct current having a predetermined voltage are arranged; direct current outputs of said plural DC/DC converters are connected to a third common bus; and through said third common bus said direct current outputs of said plural DC/DC converters are supplied to plural loads.
Claim 6
Dependent Claim
74 words
In a power supply system in which outputs from plural converters are connected in parallel and said outputs are supplied to a load, the power supply system, wherein when an allowance failure number of said converter is expressed by h, and a number of said converters being connected in parallel is expressed by k, a formula is selected so as to satisfy a relationship (2 + 2h) ≦ k ≦ (8 + 2h) .
Claim 7
Dependent Claim
118 words
In a power supply system having plural converters for supplying the direct current electric power to plural loads such as a magnetic disk apparatus and a control circuit etc., the power supply system, wherein said plural loads are divided into plural groups; a first common bus supplies the electric power to a first group of said plural loads; a first cluster is comprised of said first common bus; a second cluster are connected to said first cluster in plural; a second common bus supplies commonly the electric power to said second cluster; said plural converters are connected to said second common bus; and through said classified first and second common busses the electric power is given and supplied.
Claim 8
Dependent Claim
66 words
In a power supply system according to claim 7, wherein the power supply system comprises further, a third cluster for supplying the electric power to said second common bus and said second cluster is provided; by providing common busses classified x degree (x is an integer number) said plural converters are connected the highest classified degree common bus; and the electric power is given or supplied.
Claim 9
Dependent Claim
68 words
In a power supply system according to claim 7, wherein the power supply system comprises further, a ground side of each of said first common bus and said second common bus is formed one each; plural non-ground sides of each of said first common bus and said second common bus are connected in parallel; and through said plural classified common busses the electric power is given and supplied.
Claim 10
Dependent Claim
60 words
In a power supply system according to claim 7, wherein the power supply system comprises further, at an anti-ground side of each of said first common bus and said second common bus a fuse is provided; and a capacity of said fuse of said first common bus is smaller than a capacity of said fuse of said second common bus.
Claim 11
Dependent Claim
46 words
In a power supply system according to claim 7, wherein the power supply system comprises further, at a non-ground side of each of said first common bus and said second common bus a switching means for cutting off a supply of the electric power is provided.
Claim 12
Dependent Claim
40 words
In a power supply system according to claim 7, wherein the power supply system comprises further, a condenser is connected between a ground side and an anti-ground side of each of said first common bus and said second common bus.
Claim 13
Dependent Claim
30 words
In a power supply system according to claim 7, wherein the power supply system comprises further, said first common bus and said magnetic disk apparatus is connected through a diode.
Claim 14
Dependent Claim
41 words
In a power supply system according to claim 7, wherein the power supply system comprises further, by connecting 8 x x (x : integer number) number magnetic disk apparatuses to said first common bus, the electric power is given and supplied.
Claim 15
Dependent Claim
28 words
In a power supply system according to claim 7, wherein the power supply system comprises further, 8 x x (x : integer number) number first cluster are arranged.
Claim 16
Dependent Claim
59 words
In a power supply system according to claim 7, wherein the power supply system comprises further, relating to a bit direction of a data being recorded on said magnetic disk apparatus, a first bit is recorded on a first cluster, a second bit is recorded on a second cluster, and n number bit is recorded on n number cluster.
Claim 17
Dependent Claim
74 words
A power supply system comprises, a load group having plural loads; a converter group having plural DC/DC converters; plural rectifying units; and plural alternative current power supplies; the power supply system, wherein by connecting through at least one common bus, between said load group and said converter group, between said plural converters and said rectifying units, and between said rectifying units and said plural alternative power supplies, the electric power is given and supplied.
Claim 18
Dependent Claim
91 words
A power supply system, wherein one power factor improvement circuit rectifies outputs from plural alternative current power supplies through each of rectifying means; relating to each of said rectified outputs, through each of inductances, in said one power factor improvement circuit, a power factor of each of said alternative current power supplies is improved by a switching operation at a higher frequency than that of said alternative current power supply through a switching element; and said rectified outputs are supplied to plural converters as the electric power through a common bus.
Claim 19
Dependent Claim
47 words
In a power supply system according to claim 18, wherein by controlling an "on/off " ratio (conductive ratio) of said switching element, a terminal voltage of a smoothing condenser which is provided at an output side of said power-factor improvement circuit is made at a substantially constant.
Claim 20
Dependent Claim
107 words
In a power supply system according to claim 18, wherein said power factor improvement circuit rectifies said outputs from plural alternative current supplies having the different frequency and the different phase through each of rectifying means; plural outputs of said plural alternative current power supplies are connected through each of said inductances; by changing a conductive ratio between a first switching element and a second switching element of a double forward type DC/DC converter which switches at the higher frequency than that of said alternative current power supplies, the power factor of each of said alternative current power supplies is improved in said power factor improvement circuit.
Claim 21
Dependent Claim
84 words
A power supply system for use in an electric car, wherein the power supply system comprises: a motor group having plural motors for driving driving wheels of the electric car; a converter group having plural converters defined in claim 1; and plural battery power supplies; wherein said motor group and said converter group are connected through plural common buses; said plural converters and plural direct current power supplies are connected through at least one common bus; and the electric power is given and supplied.
Claim 22
Dependent Claim
87 words
A power supply system for use in a computer, wherein the power supply system comprises: plural computer groups constituting a computer system; a converter group defined in claim 2 for supplying the electric power to said plural computer groups; plural rectifying units; and plural alternative current power supplies; wherein said plural computer groups and said converter group are connected through plural common buses; said plural converter and said plural rectifying units are connected through at least one common bus; and the electric power is given and supplied.
References Cited (Backward Citations)
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