EP0410716A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Uninterruptible power supply
Assignee: Toshiba Corp
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Filing: 1990-07-25
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Granted: —
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Expires: 2010-07-25
Abstract
Abstract A power supply (11) is energized by an external power source (10) and a battery (18), and supplies electric power to a load (17). The power supply includes a battery voltage detector (20) and a current detector (19) for detecting a discharge current (I19) from the battery (18). The remaining capacity (Tb in Fig. 3) of the battery (18) is detected in accordance with a change (ΔE in Fig. 3) in the battery voltage (E20) when the external power source (10) is free of power failure. The battery voltage change (ΔE) is defined as the difference between an initial voltage (V1 at t1) of the battery (18) and an active voltage (V1-ΔE at t4) of the battery (18) obtained when the battery (18) is discharged by the detected discharge current (I19) for a predetermined period of time (Ta).
Inventors
- 👤 Akio C/O Intellectual Property Division Hirata
- 👤 Yoshiaki Intellectual Property Division Miyazawa
- 👤 Michiro Intellectual Property Division Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:19
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/062
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
169 words
A power supply (11), which is energized by at least one of an external power source (10) and a battery (18), and supplies electric power to a load (17), comprising: (Fig. 1 or 8) means (20) for detecting a battery voltage (E20) generated by the battery (18); means (19 or 24) for detecting an amount of electric charges discharged from the battery (18) when the power supply (11) is energized by the battery (18); and means (21 or 210) for detecting a remaining capacity (Tb in Fig. 3) of the battery (18) in accordance with a change (ΔE in Fig. 3) in the battery voltage (E20) when the external power source (10) is free of power failure; wherein said battery voltage change (ΔE) is a difference between an initial voltage (V1 at t1) of the battery (18) and an active voltage (V1-ΔE at t4) of the battery (18) obtained when the battery (18) is discharged by a predetermined current (Id or I19) for a predetermined period of time (Ta).
Claim 2
Dependent Claim
169 words
A power supply (11), which is energized by at least one of an external power source (10) and a battery (18), and supplies electric power to a load (17), comprising: (Fig. 1 or 8) means (20) for detecting a battery voltage (E20) generated by the battery (18); means (19 or 24) for detecting an amount of electric charges discharged from the battery (18) when the power supply (11) is energized by the battery (18); and means (21 or 210) for detecting a remaining capacity (Tb in Fig. 3) of the battery (18) in accordance with a change (ΔE in Fig. 3) in the battery voltage (E20) when the external power source (10) is free of power failure; wherein said battery voltage change (ΔE) is a difference between an initial voltage (V1 at t1) of the battery (18) and an active voltage (V1-ΔE at t4) of the battery (18) obtained when the battery (18) is discharged by a predetermined current (Id or I19) for a predetermined period of time (Ta).
Claim 3
Dependent Claim
87 words
A power supply according to claim 1, characterized in that said remaining capacity detecting means (21) includes: (Fig. 6) means (CPU in 21) for fetching said predetermined current (Id); means (CPU in 21) for fetching said battery voltage change (AE); means (CPU in 21) for calculating an active capacity (ΔH*) of said battery (18) from said predetermined current (Id=Id*) and the battery voltage change (ΔE=ΔE*), based on a predetermined relationship (Fig. 4) between the active capacity (AH) and the battery voltage change (ΔE) of said battery (18).
Claim 4
Dependent Claim
69 words
A power supply according to claim 2, characterized in that said remaining capacity detecting means (21) further includes: (Fig. 6) means (CPU in 21) for diagnosing said remaining capacity (Tb), in accordance with a predetermined relation (Fig. 5) between an actually dischargable time (Tx) of the battery (18) and a ratio (K in Eq. (1)) of the calculated active capacity (AH*) to a current (1L) of said load (17).
Claim 5
Dependent Claim
21 words
A power supply according to claim 1, characterized by further comprising: means (22) for charging said battery (18 in Fig. 7).
Claim 6
Dependent Claim
90 words
A power supply according to claim 4, characterized by further comprising: means (25 in Fig. 10 or 12) for controlling the changing of said battery (18) in accordance with a predetermined condition (E251), said predetermined condition (E251) being selected from a plurality of changing conditions, (EE, EF) such that when the battery voltage (E20) exceeds a predetermined reference, one (EE) of said charging conditions (EE, EF) is selected, and when the battery voltage (E20) falls under the predetermined reference, another one (EF) of said charging conditions (EE, EF) is selected.
Claim 7
Dependent Claim
141 words
A power supply according to claim 1, characterized in that said power supply (11) includes: (Fig. 7, 9, or 14) a first AC-AC power converter (11A) having a first rectifier means (12A) for converting input AC power (E10) from said external power source (10) into first DC power (E12A), and a first inverter means (14A, 15A) for converting the first DC power (E12A) into output AC power (E11) supplied to said load (17); a second AC-AC power converter (11b) having a second rectifier means (12B) for converting said input AC power (E10) into second DC power (E12B), and a second inverter means (14B, 15B) for converting the second DC power (E12B) into said output AC power (E11); and means (23A, 23B) for feeding DC power (E20) from said battery (18) to each of said first and second inverter means (14A/B, 15A/B).
Claim 8
Dependent Claim
30 words
A power supply according to claim 1, characterized by further comprising: means (22) for charging said battery (18 in Fig. 14) by energy obtained from said external power source (10).
Claim 9
Dependent Claim
58 words
A power supply according to claim 7, characterized by further comprising: means (26 in Fig. 14) for controlling said charging means (22), such that when the battery voltage (E20) exceeds a predetermined reference, a first charging condition (EE) is selected, and when the battery voltage (E20) falls under the predetermined reference, a second charging condition (EF) is selected.
Claim 10
Dependent Claim
134 words
A power supply according to claim 1, characterized in that said power supply (11) includes: (Fig. 7, 9, or 14) a first power converter (11A) having a first rectifier means (12A) for converting input AC power (E10) from said external power source (10) into first DC power (E12A), and a first means (14A, 15A) for converting the first DC power (E12A) into output power (E11) supplied to said load (17); a second power converter (11B) having a second rectifier means (12B) for converting said input AC power (E10) into second DC power (E12B), and a second means (14B, 15B) for converting the second DC power (E12B) into said output power (E11); and means (23A, 23B) for feeding DC power (E20) from said battery (18) to each of said first and second means (14A/B, 15A/B).
References Cited (Backward Citations)
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