Patent US4566289A successfully refreshed from Google Patents.
US4566289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator control system
Assignee: Hitachi Ltd
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Filing: 1984-11-09
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Granted: 1986-01-28
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Expires: 2004-11-09
Abstract
Abstract A novel refrigerator control system is disclosed which comprises an inverter for driving a motor for a compressor, and a change-over device for driving the compressor directly with a commercial power supply when the compressor motor is not driven by the inverter.
Inventors
- 👤 Kenichi Iizuka
- 👤 Hideo Uzuhashi
- 👤 Yoshihisa Uneyama
- 👤 Michiya Matuda
- 👤 Minoru Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:41
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F25B49/025; F25B1/00; F25B2600/00; F25B2600/02; F25B2600/021; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A control system for a refrigerator including a compressor for making up a freezing cycle and a motor driven by a commercial power supply for driving said compressor, said control system comprising an inverter circuit connected to said commercial power supply, a power switch connected to said commercial power supply, switching means connected to said motor and switchable between a first mode where said motor is connected to said commercial power supply through said inverter and a second mode where said motor is connected to commercial power supply through said power switch, and control means responsive to a predetermined external signal applied thereto for producing a control signal for turning off said power switch and then switching said switching means from said second mode to said first mode.
Claim 2
Dependent Claim
128 words
A control system for a refrigerator including a compressor for making up a freezing cycle and a motor driven by a commercial power supply for driving said compressor, said control system comprising an inverter circuit connected to said commercial power supply, a power switch connected to said commercial power supply, switching means connected to said motor and switchable between a first mode where said motor is connected to said commercial power supply through said inverter and a second mode where said motor is connected to commercial power supply through said power switch, and control means responsive to a predetermined external signal applied thereto for producing a control signal for turning off said power switch and then switching said switching means from said second mode to said first mode.
Claim 3
Dependent Claim
47 words
A control system according to claim 1, wherein said control means includes a phase detector for detecting a phase of voltage of said commercial power supply and means for producing said control signal upon detection of a predetermined condition of the voltage of said commercial power supply.
Claim 4
Dependent Claim
37 words
A control system according to claim 2, wherein said control means further comprises means for applying said control signal to said inverter thereby actuating said inverter after said switching means has been switched to said first mode.
Claim 5
Dependent Claim
53 words
A control system according to claim 1, wherein said control means includes a phase detector for detecting a phase of current supplied to said motor from said commercial power supply and means for producing said control signal upon detection of a predetermined condition of the phase of the current supplied to said motor.
Claim 6
Dependent Claim
37 words
A control system according to claim 4, wherein said control means further comprises means for applying said control signal to said inverter thereby actuating said inverter after said switching means has been switched to said first mode.
Claim 7
Dependent Claim
22 words
A control system according to claim 1, wherein the predetermined external signal is indicative of a rapid freeze cycle for the refrigerator.
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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |