US6002220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric power storage air-conditioning system
Assignee: Hitachi Ltd
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Filing: 1997-08-19
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Granted: 1999-12-14
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Expires: 2017-08-19
Abstract
Abstract A high-efficiency, compact and low-cost electric power storage air-conditioning system incorporates inside its air-conditioner an electric power storage unit including a battery which is electrically interconnected to a d.c. system of the air-conditioner. Charging of the battery is controlled to be executed only during a steady operation of the air-conditioner when its load is light. Since a d.c. voltage of the battery is used directly as a d.c. voltage to drive the air-conditioner, a high efficiency, minimized loss and economical operation conditioning system is achieved.
Inventors
- 👤 Tadashi Takahashi
- 👤 Satoru Funaki
- 👤 Katsunori Nishimura
- 👤 Hidetoshi Honbo
- 👤 Noriaki Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:04
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/865; H02J7/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
An electric power storage air-conditioning system having a converter unit for converting a.c. to d.c. and a motor drive unit for driving a motor which actuates a compressor using the d.c., comprising: a secondary battery system, which is rechargeable and has an electric interconnection between said converter unit for converting a.c. to d.c. and said motor drive unit for driving the motor using the d.c., wherein said secondary battery system includes a battery which is charged by said converter unit for converting a.c. to d.c.; and a charge control unit provided between the battery of said secondary battery system and said converter unit for controlling a charge current for charging said battery to be within a difference between a current capacity of said converter and a load current.
Claim 2
Dependent Claim
128 words
An electric power storage air-conditioning system having a converter unit for converting a.c. to d.c. and a motor drive unit for driving a motor which actuates a compressor using the d.c., comprising: a secondary battery system, which is rechargeable and has an electric interconnection between said converter unit for converting a.c. to d.c. and said motor drive unit for driving the motor using the d.c., wherein said secondary battery system includes a battery which is charged by said converter unit for converting a.c. to d.c.; and a charge control unit provided between the battery of said secondary battery system and said converter unit for controlling a charge current for charging said battery to be within a difference between a current capacity of said converter and a load current.
Claim 3
Dependent Claim
35 words
An electric power storage air-conditioning system according to claim 1, wherein said system further comprises a DC/DC converter which is interconnected between said converter unit for converting a.c. to d.c. and said secondary battery system.
Claim 4
Dependent Claim
52 words
An electric power storage air-conditioning system according to claim 1, which further comprises a step-up coil which is interconnected in series with said secondary battery system, and a switching semiconductor device, whereby said step-up coil is energized to step up an output of the secondary battery system by switching said semiconductor device.
Claim 5
Dependent Claim
38 words
An electric power storage air-conditioning system according to claim 3, wherein said secondary battery system comprises charging and discharging semiconductor elements which are connected to the step-up coil which is connected in series with the secondary battery system.
Claim 6
Dependent Claim
59 words
An electric power storage air-conditioning system according to claim 1, wherein said secondary battery system comprises: a discharge control semiconductor element and a step-up coil, both connected in series with the battery of said secondary battery system; and a charge control semiconductor element which is connected between said step-up coil and said converter unit for converting a.c. to d.c.
Claim 7
Dependent Claim
53 words
An electric power storage air-conditioning system according to claim 1, wherein the battery of said secondary battery system is connected in series with a step-up coil via a discharge control semiconductor element, and said converter unit for converting a.c. to d.c. is connected to said step-up coil via a charging control semiconductor element.
Claim 8
Dependent Claim
77 words
An electric power storage air-conditioning system according to claim 1, wherein said secondary battery system comprises: a discharge control semiconductor element connected in series with the battery of said secondary battery system; a transformer having a secondary coil which is connected in series with the discharge control semiconductor element; and a charging control semiconductor element which is connected between a primary coil of the transformer and the converter unit of the air-conditioner for converting a.c. to d.c.
Claim 9
Dependent Claim
66 words
An electric power storage air-conditioning system according to claim 1, wherein the battery of said secondary battery system is connected to a secondary coil of a transformer via a discharge control semiconductor element which is connected in series therebetween, and the converter unit of the air-conditioner for converting a.c. to d.c. is connected to a primary coil of the transformer via a charging control semiconductor element.
Claim 10
Dependent Claim
25 words
An electric power storage air-conditioning system according to claim 1, wherein the battery of said secondary battery system is comprised of a lithium ion battery.
Claim 11
Dependent Claim
24 words
An electric power storage air-conditioning system according to claim 1, wherein said secondary battery system is installed inside an outdoor unit of air-conditioning equipment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-13 | 2003-06-14 | 2003-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-13 | 2007-06-14 | 2007-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-13 | 2011-06-14 | 2011-12-14 | $7700.00 | Window Closed / Lapsed |