EP0660487B1
Expired / Lapsed
EP
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Power supply system
Assignee: Hitachi Ltd
•
Filing: 1994-12-21
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Granted: 2005-03-02
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Expires: 2014-12-21
Abstract
No abstract record available.
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
2026-10-29 13:09
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: 19
Claim 1
Independent Claim
327 words
A power supply system comprising: a plurality of electric power converters (Con1 - Con4), each for converting
an input current to a direct current having a predetermined voltage, outputs
of said converters (con1 - Con4) being connected in parallel to supply
electric power to a load (Lo); a current detection means (Cs) for detecting a magnitude of output current
(Cs1) of each of said plurality of converters (Con1 - Con4); a maximum current detection means ((CCs1, OP2, D3', CL) of CC1) for
detecting a maximum output current value among the output current values
(Cs1) of said converters (Con1 - Con4) detected by said current detection
means (Cs); a control means (OP1, Rf, Vs1, PWM) of CC1) for controlling the output
current values and the output voltage values of said plurality of converters
(Con1 - Con4), comprising: a determination means ((CCs1, OP2, D3', CL) of CC1) for comparing
said detected maximum output current value with said detected
output current values of each of said converters (Con 1 -
Con4), means ((OP1, Rf, Vs1, PWM) of CC1) for controlling each of said
output current values of said converters (Con1 - Con4) such that
they match with said detected maximum output current value of
said converters (Con1 - Con4) and such that even in case that one
of the plurality of converters (Con1 - Con4) is defective and its
output current value is zero, the output current values of the remaining
converters are the same as said detected maximum output
current value; characterized in that each of said converters (Con1 - Con4) is provided with a diode (DP1) for
preventing a reverse flow of current; the number of converters(Con1 - Conk), when an allowable failure number
of said converter (Con1 - Conk) is expressed by h, and the number of
said plurality of converters (Con1 -Conk) connected in parallel is expressed
by k, is selected so as to satisfy a relationship (2 + 2h) ≤ k ≤
(8 + 2h).
Claim 2
Dependent Claim
162 words
A power supply system according to claim 1, characterized in that each of said
converters (Con1 - Con4) comprises a transformer (TR) to convert alternating or direct current to direct current
having a predetermined voltage; and the power supply system comprising: a current value detection means (Idc) for detecting a current value flowing in a
secondary coil of said transformer (TR); a respective current value detection circuit (Cvj) for detecting a DC output
current value of said respective converter (Con1 - Con4); a maximum current value detection circuit (Cvm) for comparing current values
from said respective current value detection means (Cvj) of said respective
converters (Con1 - Con4) for detecting a maximum current value among said
compared current values; and an addition means for adding a difference between said maximum current value
of said respective converter (Con1 - Con4) and said output current value of said
respective converter (Con1 - Con4) to said voltage value control means ((Vs1,
Rf, PWM) of CC1).
Claim 3
Dependent Claim
134 words
A power supply system according to claim 1, characterized in that it is
comprising further: an AC power supply (AcS) connected to a first common bus (Bu1); a plurality of rectifying means (Re1 - Re3) for converting an alternating current
from said first common bus (Bu1) to a direct current; a second common bus (Bu2) connected to direct current outputs of said
plurality of rectifying means (Re1 - Re3) a plurality of DC/DC converters
(Con1 - Conk) coupled to receive a DC input from said second common bus
(Bu2) for converting the alternating current to a direct current having a
predetermined voltage; and a third common bus (Bu3) connected to DC outputs of DC/DC converters
(Con1 - Conk) being supplied to a plurality of loads (Lo1 - Lom) through said
third common bus (Bu3).
Claim 4
Dependent Claim
172 words
A power supply system having a plurality of converters (PS1 - PSk) for
supplying direct current electric power to a plurality of loads (DU11 - DU1m;
...; DUn1 - DUnm), according to claim 1, characterized in that : said plurality of loads (DU11 - DU1m; ...; DUn1 - DUnm) are divided into
plural groups (DU11 - DU1m; ...; DUn1 - DUnm); a first common bus (BU11, BU12, ..., BU1g) supplies electric power to a first
group (DU11 - DU1m) of said plurality of loads (DU11 - DU1m; ...; DUn1 -
DUnm); a first cluster is comprised of said first common bus (BU11, BU12, ..., BU1g); a second cluster are connected to said first cluster in plural; a second common bus (BU21, BU22, ..., BU2g) supplies commonly electric
power to said second cluster; said plurality of converters (PS1 - PSk) are connected to said second common
bus (BU21, BU22, ..., BU2g); and through said first and second common buses (BU11, BU12, ..., BU1g; BU21,
BU22, ..., BU2g) electric power is given and supplied.
Claim 5
Dependent Claim
71 words
A power supply system according to claim 4, characterized in that the power
supply system comprising: a third cluster for supplying electric power to said second common bus (BU21,
BU22, ..., BU2g) and said second cluster; by providing common buses classified x degree (x being an integer) said
plurality of converters (PS1 - PSk) are connected to the highest classified
degree common bus; and the electric power is given and supplied.
Claim 6
Dependent Claim
89 words
A power supply system according to claim 4, characterized in that the power
supply system comprising: a single ground side (BU11, BU12, ..., BU1g) of each of said first common bus
(BU11, BU12, ..., BU1g) and said second common bus (BU21, BU22, ...,
BU2g); plural anti-ground sides (BU21, BU22, ..., BU2g) of each of said first common
bus (BU11, BU12, ..., BU1g) and said second common bus (BU21, BU22, ...,
BU2g) are connected in parallel; and through said plural classified common buses the electric power is given and
supplied.
Claim 7
Dependent Claim
93 words
A power supply system according to claim 4, characterized in that the power
supply system comprising: a fuse (F111 - F112; ...; Fn11 - Fn12; F01, F02) provided at an anti-ground side
of each of said first common bus (BU11, BU12, ..., BU1g) and said second
common bus (BU21, BU22m ..., BU2g); and a capacity of said fuse (F111 - F112; ...; Fn11 - Fn12) of said first common bus
(BU11, BU12, ..., BU1g) is smaller than a capacity of said fuse (F01, F02) of
said second common bus (BU21, BU22, ..., BU2g).
Claim 8
Dependent Claim
56 words
A power supply system according to claim 4, characterized in that the power
supply system comprising: a switch (SW11, SW12, ..., SWn1, SWn2; SW1, SW2) for cutting off a supply
of the electric power at an anti-ground side of said first common bus (BU11,
BU12, ..., BU1g) and said second common bus (BU21, BU22, ..., BU2g).
Claim 9
Dependent Claim
58 words
A power supply system according to claim 4, characterized in that the power
supply system comprising: a condenser (C01, C02) connected between a ground side and an anti-ground
side of each of said first common bus (BU11, BU12, ..., BU1g) and said second
common bus (BU21, BU22, ..., BU1g) and said second common bus (BU21,
BU22, ..., BU2g).
Claim 10
Dependent Claim
47 words
A power supply system according to claim 4, characterized in that the power
supply system comprising: a diode (D111 - D112, ..., D1n1 - D1n2) connecting said first common bus
(BU11, BU 12, ..., BU1g) and a magnetic disk apparatus (DU11 - DU1m, ...,
DUn1 - DUnm).
Claim 11
Dependent Claim
47 words
A power supply system according to claim 4, characterized in that the power
supply system comprising: 8 x x (x: integer number) number magnetic disk apparatuses (DU11 - DU1m,
..., DUn1 - DUnm) connected to said first common bus (BU11, BU12, ...,
BU1g), supplying the electric power.
Claim 12
Dependent Claim
22 words
A power supply system according to claim 4, characterized in that 8 x x (x: integer number) number first clusters are arranged.
Claim 13
Dependent Claim
53 words
A power supply system according to claim 4, characterized in that relating to a bit direction of data being recorded on a 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 14
Dependent Claim
117 words
A power supply system according to claim 1, the power supply system
comprising: a load group (Lo1 - Lom) having a plurality of loads (Lo1 - Lom); a converter group (Con1 - Con4) having a plurality of DC/DC converters (Con1
- Con4); a plurality of rectifying units (Re1 - Re3); a plurality of AC power supplies (AcS1, AcS2); and through at least one
common bus (BU11, BU12, ..., BU1g; BU21, BU22, ..., BU2g) connected
between said load group (Lo1 - Lom) and said converter group, (Con1 - Con4)
and said rectifying units (Re1 - Re3) and said plurality of AC power supplies
(AcS1,AcS2), whereby the electric power is supplied to said plurality of loads (Lo1 - Lom).
Claim 15
Dependent Claim
118 words
A power supply system according to claim 1, the power supply system
comprising: a single power factor improvement circuit (Pf) coupled to rectify outputs from a
plurality of AC power supplies (AcS1, AcS2) through respective rectifying
elements (Re1, Re2); relating to each of said rectifying outputs, through respective inductances (Le1,
Le2), in said single power factor improvement circuit (Pf), a power factor of
each of said AC power supplies (AcS1, AcS2) is improved by a switching
operation at a higher frequency than that of said AC power supply (AcS1,
AcS2) through a switching element (Mo3); and said rectified outputs are supplied to a plurality of converters (Con1, Con2) as
the electric power through a common bus (Bu2, Bu2g).
Claim 16
Dependent Claim
47 words
A power supply system according to claim 15, characterized in that by controlling a duty ratio of said switching element (Mo3), a terminal voltage
of a smoothing condenser (C2) which is provided at an output side of said
power factor improvement circuit (Pf) is maintained substantially constant.
Claim 17
Dependent Claim
124 words
A power supply system according to claim 15, characterized in that said power factor improvement circuit (Pf) rectifies said outputs from a
plurality of AC power supplies (AcS1, AcS2) having a different frequency and
a different phase through respective rectifying elements (Re1, Re2); a plurality of outputs of said plurality of AC power supplies (AcS1, AcS2) are
connected through said respective inductances (Le1, Le2); by changing a duty ratio between a first switching element (Mo1) and a second
switching element (Mo2) of a double forward type DC/DC converter (Con1)
which switches at the higher frequency than that of said AC power supplies
(AcS1, AcS2), the power factor of said respective AC power supplies (AcS1,
AcS2) is improved in said power factor improvement circuit (Pf).
Claim 18
Dependent Claim
105 words
A power supply system for use in an electric car according to claim 1, the power supply system comprising: a plurality of motors (Mt1, Mt2) for driving the electric car; a plurality of inverters (Inv1 - Invk); and a plurality of battery power supplies (Bt1, Bt2); characterized in that said plurality of motors (Mt1, Mt2) and a plurality of inverters (Inv1 -Invk) are
connected through a plurality of common buses (Bus31, Bu32); and said plurality of inverters (Inv1 - Invk) and a plurality of power supplies (AcS1,
AcS2) are connected through at least one common bus (Bu1, Bu2), the electric power is given and supplied.
Claim 19
Dependent Claim
108 words
A power supply system for use in a computer system having a plurality of
computers according to claim 1, the power supply system comprising: a plurality of converters (Con1, Con2) for supplying electric power to said
plurality of computers; a plurality of rectifying units (Re1, Re2); and a plurality of AC power supplies (AcS1, AcS2); characterized in that said plurality of computers and said plurality of converters (Con1, Con2) are
connected through plural common buses (Bu31, Bu32); and said plurality of converters (Con1, Con2) and said plurality of rectifying units
(Re1, Re2) are connected through at least one common bus (Bu21), the electric power is given and supplied.
References Cited (Backward Citations)
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