Patent US4958055A successfully refreshed from Google Patents.
← Back to Patent Explorer
US4958055A Expired / Lapsed US ⏱️ 0.0 years remaining

Control circuit for a refrigerator combined with a microwave oven

Assignee: Samsung Electronics Co Ltd
•
Filing: 1989-05-17
•
Granted: 1990-09-18
•
Expires: 2009-05-17
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A control circuit for a refrigerator combined with a microwave oven includes signal delay selecting and comparing circuitry start sensing circuitry timer circuitry and load driving circuitry in order to properly control operations of the refrigerator and the microwave oven. The control circuit eliminates unnecessary delay time of the operation of the microwave oven during operation of the refrigerator, and makes the refrigerator operate after start-up of the microwave oven is completed.

Inventors

  • 👤 Jae E. Shim

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 16:17
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6447; H05B6/645; F; F25; F25B; F25B9/00; F25B9/14; F25D; F25D23/00; F25D23/12; F25D29/00; H02; H02H; H02H11/00; H02J; H02J3/00; H02J3/12; H02J3/14; H05B6/66; F25B2600/00; F25B2600/23; H02J2105/00; H02J2105/40; H02J2105/42; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222; Y04S20/242

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 145 words
A control circuit for use in controlling a refrigerator circuit combined with a microwave oven, comprising: a signal delay selecting and comparing means, including a signal comparator, for controlling the start-up of the refrigerator circuit, the refrigerator circuit consuming a relatively small current, and the microwave oven requiring a relatively large current, and including a logic circuit for controlling the comparator; a start sensing means, having a flip-flop toggled by a start switch, for sensing the start of the microwave oven; a display means, connected to said start sensing means, for displaying the operation of the microwave oven; a timer means for causing a delay between the operation of said refrigerator circuit and said microwave oven; and a load driving means for driving said refrigerator circuit and said microwave oven, having at least two driving circuits connected to said sensing means and said timer means.
Claim 2
Dependent Claim 145 words
A control circuit for use in controlling a refrigerator circuit combined with a microwave oven, comprising: a signal delay selecting and comparing means, including a signal comparator, for controlling the start-up of the refrigerator circuit, the refrigerator circuit consuming a relatively small current, and the microwave oven requiring a relatively large current, and including a logic circuit for controlling the comparator; a start sensing means, having a flip-flop toggled by a start switch, for sensing the start of the microwave oven; a display means, connected to said start sensing means, for displaying the operation of the microwave oven; a timer means for causing a delay between the operation of said refrigerator circuit and said microwave oven; and a load driving means for driving said refrigerator circuit and said microwave oven, having at least two driving circuits connected to said sensing means and said timer means.
Claim 3
Dependent Claim 85 words
A control circuit according to claim 1, further comprising: a temperature control means, having an operational amplifier, for controlling the start of the refrigerator circuit by determining an input bias by means of a variable resistor connected to one input terminal of said operational amplifier; and a temperature sensing and controlling means, having a differential amplifier, for receiving a hysteresis output of said temperature control means and for comparing said hysteresis output with bias current of a temperature sensing thermistor connected to a terminal thereof.

References Cited (Backward Citations)

US3066227A Cited
US4068781A Cited
US4399352A Cited
US4398651A Cited
US4472640A Cited
US4847722A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-09-17 1994-03-19 1994-09-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-09-17 1998-03-19 1998-09-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-09-17 2002-03-19 2002-09-18 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag