Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
2000-08-30
2002-03-05
Walberg, Teresa (Department: 3742)
Refrigeration
Automatic control
Refrigeration producer
C062S126000, C062S230000, C062S228300
Reexamination Certificate
active
06351960
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus and a method for protecting a motor of an inverter refrigerator, in particular to the apparatus and method for protecting the motor of the inverter refrigerator which is capable of protecting the motor of the inverter refrigerator by preventing cutting off of a power feeding on a CPU (Central Processing Unit) when an OLP (Over Load Protector) operates and interrupts the power feed.
2. Description of the Prior Art
In general, in comparison with the conventional refrigerator adopting an ON-OFF method which regularly turns on/off a compressor, an inverter refrigerator adopts a technology which can optimize cooling air discharges and electric consumption of the inverter refrigerator in accordance with circumstances by controlling optimally operating hours and operating speed of a compressor of the inverter refrigerator.
FIG. 1
is a block diagram illustrating an apparatus for protecting a motor of the inverter refrigerator according to the conventional technology. As depicted in
FIG. 1
, the conventional apparatus comprises an OLP ( Over Load Protector)
10
preventing damages of the motor winding by cutting off a power feeding to the motor of the compressor in accordance with a rise in temperature of the motor winding and increase of load current when the compressor does not operate well due to a certain cause or overload occurs while the compressor operates, a SMPS (Switching Mode Power Supply)
20
providing an AC power source through the OLP
10
, a detector
30
detecting the present state of the refrigerator, a CPU (Central Processing Unit)
40
driven by the power of the SMPS
20
, processing a detecting signal of the detector
30
and outputting a control signal for controlling operation of the refrigerator, a driving unit
50
controlling operation of the motor of the compressor by receiving a compressor control signal outputted from the CPU
40
, and a display unit
60
displaying state of the refrigerator in accordance with a state control signal outputted from the CPU
40
.
The operation of the conventional apparatus for protecting the motor of the inverter refrigerator will now be described.
First, when the SMPS
20
is inputted the AC power source through the OLP
10
and feeds the AC power source to the CPU
40
as an operating power, and the CPU
40
is driven by the power fed by the SMPS
20
and controls generally various parts of the refrigerator. The CPU
40
is inputted the present state of the refrigerator through the detector
30
and operates the refrigerator by controlling the driving unit
50
in accordance with the present state of the refrigerator, and informs the present state of the refrigerator to a user by controlling the display unit
60
. Herein, when the overload occurs on the motor of the compressor, the temperature of the winding of the motor rises or the overload increases, the motor of the compressor is protected by cutting off the power feeding to the motor by operating of the OLP
10
connected to a power input unit of the motor.
However, in the above-described conventional apparatus for protecting the motor of the inverter refrigerator, the CPU
40
can not store hysteresis of the past driving states of the inverter refrigerator because all the power feeding to the refrigerator is cut off by operating of the OLP
10
. Accordingly, the conventional apparatus can not operate properly corresponding to the present operation of the OLP of the inverter refrigerator.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus and a method for protecting a motor of an inverter refrigerator which is capable of continuing power feeding to a CPU
40
by switching a power feed line and stopping operation of the motor of a compressor when an OLP
10
drives, and operating the motor of the compressor by feeding normal power passing through the OLP
10
when the OLP
10
is in the normal state.
In order to achieve the above object, the apparatus for protecting the motor of the inverter refrigerator of the present invention comprises the OLP
10
cutting off an AC power source inputted to the motor of the compressor in overload, an OLP detector
70
detecting operation
on-operation of the OLP
10
, a power select unit
80
inputted the AC power source passing through the OLP
10
and the AC power source without passing through the OLP, a CPU (Central Processing Unit)
40
outputting a power select control signal to the power select unit
80
and a driving control signal for driving the motor after being inputted a detecting signal from the OLP detector
70
, a SMPS (Switching Mode Power Supply)
20
feeding a driving power to the CPU
40
after receiving the power outputted from the power select unit
80
controlled in accordance with the power select control signal outputted from the CPU
40
, a driving unit
50
controlling the operation of the motor of the compressor after receiving the driving control signal outputted from the CPU
40
, a detector
30
outputting a detecting signal to the CPU
40
after detecting the present state of the refrigerator, and a display unit
60
displaying the state of the refrigerator in accordance with a state control signal outputted from the CPU
40
.
The method for protecting the motor of the inverter refrigerator of the present invention judges whether the OLP
10
operates by using the OLP detect unit
70
, in the result of the judging step when the OLP
10
operates, the CPU
40
is fed by the AC power source without passing through the OLP
10
, the CPU
40
switches the power select unit
80
from one side P
2
to the other side P
1
by select-controlling the power feed line, in the result of the judging step when the OLP
10
does not operate, the CPU
40
switches the power select unit
80
from the side P
1
to the other side P
2
by select-controlling the power feed line.
REFERENCES:
patent: 4079432 (1978-03-01), Godfrey
patent: 4196462 (1980-04-01), Pohl
patent: 4286303 (1981-08-01), Genheimer et al.
patent: 4653285 (1987-03-01), Pohl
patent: 5035118 (1991-07-01), Hara
patent: 5463874 (1995-11-01), Farr
patent: 5488834 (1996-02-01), Schwarz
patent: 5537834 (1996-07-01), Farr
patent: 5557938 (1996-09-01), Hanson et al.
patent: 5579648 (1996-12-01), Hanson et al.
Dahbour Fadi H.
LG Electronics Inc.
Ostrolenk Faber Gerb & Soffen, LLP
Walberg Teresa
LandOfFree
Apparatus and method for protecting motor of inverter... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for protecting motor of inverter..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for protecting motor of inverter... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2855960