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    3.
    发明专利
    未知

    公开(公告)号：SE343675B

    公开(公告)日：1972-03-13

    申请号：SE179768

    申请日：1968-02-12

    Applicant: MATSUSHITA ELECTRONICS CORP

    Inventor： WAKAI S ,  KOBAYASHI T

    IPC: F25D29/00 ,  G05D23/24 ,  F25D21/08

    Abstract: 1,193,911. Refrigerating; defrosting. MATSUSHITA ELECTRONICS CORP. 9 Jan., 1968 [13 Feb., 1967], No. 1230/68. Heading F4H. [Also in Division G3] A refrigerator particularly of a domestic type has at least one main compartment and at least one freezing compartment and at least one common evaporator connected to a compressor. In one phase of operation a compressor motor 45 is controlled by a thermistor 27 in the main compartment and in a selectively alternative freezing phase the motor 45 is controlled by a thermistor 37 in the freezing compartment and the temperature in the main compartment is adjusted by a heater 44 controlled by thermistor 27. A defrosting phase is also incorporated which is terminated by the thermistor 37 switched to provide a different temperature range. In position a, b of a switch G thermistor 27 controls motor 45 through a transistor 28 and relay 31 to regulate the main compartment temperature. Periodically e.g. once per 24 hours a timer motor 50 momentarily closes a switch 49 energizing a winding 47 of a defrosting valve and a relay 51, which is held over contacts B which shunt contacts 49, contacts A energizing motor 45 causing hot gas to be passed through the evaporator. When the temperature rises to a point determined by thermistor 37, a relay 41 is energized opening contacts f, g which disconnects the defrosting valve and relay 51, and closing contacts e, f re-energizing motor 45 until the temperature falls so that relay 41 de energizes. In position a, c, of switch G the motor 45 is controlled by thermistor 37 switched to a lower temperature range through a transistor 48 and relay 41. As the main compartment temperature drops below the operating point of transistor 28, heater 44 is energized through contacts f, g of relay 31 to maintain this temperature. In an alternative arrangement Fig. 3 (not shown), a heater (52) replaces the defrosting valve and motor 45 is not run during the defrosting period.

    4.
    发明专利
    未知

    公开(公告)号：SE343134B

    公开(公告)日：1972-02-28

    申请号：SE280169

    申请日：1969-02-28

    Applicant: MATSUSHITA ELECTRONICS CORP

    Inventor： KUSUDA Z ,  KOBAYASHI T

    IPC: F24F11/02 ,  F25D21/08 ,  F25D21/00 ,  G05D23/24

    Abstract: 1,194,317. Defrosting circuits. MATSUSHITA ELECTRONICS CORP. 20 Feb., 1969 [1 March, 1968], No. 9184/69. Heading H2H. [Also in Division F4] A defrosting control for an electric refrigerator has a thyristor 4 shunted by a diode 11 and capacitor 12, also a voltage divider 13, 8 normally maintaining a transistor 5 non-conductive. On closure of a manual or time switch 14, the transistor and thyristor are rendered conductive, the shunting effect of the thyristor across switch 14 maintaining the circuit conductive after switch 14 has opened, until the resistance of a thermistor 7 measuring freezer temperature drops to a low value indicative that the frost has melted. A switch 15 may be closed instantaneously to terminate operation of the circuit. The thyristor 4 may control a heater 3 or the operation of a valve admitting hot gas to the freezer.

    5.
    发明专利
    未知

    公开(公告)号：SE347587B

    公开(公告)日：1972-08-07

    申请号：SE1165868

    申请日：1968-08-30

    Applicant: MATSUSHITA ELECTRONICS CORP

    Inventor： KUSUDA Z ,  KOBAYASHI T

    IPC: F25D29/00 ,  G05D23/24 ,  F25B29/00

    Abstract: 1,172,485. Automatic temperature control systems. MATSUSHITA ELECTRONICS CORP. Aug.20, 1968 [Aug.31, 1967], No.39721/68. Heading G3R. A refrigerator compressor motor 4 is controlled by whichever temperature sensor 6, 8 situated in the freezing and provision compartments respectively has the higher temperature. The thermistors are connected to Schmitt trigger circuits T1-T4 the selection being made by diodes 18, 19 the output from which through a bilateral switching element 16 controls conduction of a triac 15. If when the compressor motor is controlled by thermistor 6 the provision compartment temperature is lowered excessively, another thermistor 10 switches through a further Schmitt trigger circuit T5, T6 a thyristor 12 into conduction thus energizing a heater 5.

    8.
    发明专利
    未知

    公开(公告)号：SE343131B

    公开(公告)日：1972-02-28

    申请号：SE1698968

    申请日：1968-12-12

    Applicant: MATSUSHITA ELECTRONICS CORP

    Inventor： KUSUDA Z ,  KOBAYASHI T

    IPC: F25D21/00 ,  G05D23/24 ,  F25D21/08

    Abstract: 1,194,760. Control systems for defrosting refrigerators. MATSUSHITA ELECTRONICS CORP. 3 Dec., 1968 [14 Dec., 1967], No. 57286/68. Heading H2H. [Also in Division F4] A defrosting arrangement for an electric refrigerator comprises means for terminating the defrosting process when the frost in the freezer has been dispersed, the means for dispersing the frost being either an electric heater or a hot gas device. An electric heater 3 in a defrosting arrangement is connected to an A.C. supply by means of a thyristor 4, the thyristor being made conductive by closure of a switch 13 and non- conductive when the resistance of a thermistor 7 rises due to the absence of frost in the freezer. A transistor 5 is normally kept in conduction due to the bias voltage derived from a potential divider 9, 10 connected across the normally non-conductive thyristor 4 rectified by a diode 11 and charging a capacitor 12. To initiate a defrosting cycle the switch 13 is closed, either manually or by a timing device. Capacitor 12 then discharges through the switch 12 thereby cutting off the transistor 5. A signal thus appears at the collector of the transistor which signal is used to trigger the thyristor 4 into conduction to energize the defrosting heater 3. When the frost in the freezer is removed, the freezer temperature rises so decreasing the resistance of the thermistor 7. As the resistance of the thermistor gradually decreases the capacitor 12 begins to acquire a charge until a point is reached where the transistor 5 is once more rendered conductive whereupon the trigger signal to the thyristor 4 disappears and the heater 3 de-energized.

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