JP2000104664A - Operation control device for refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation control device for a refrigerator, which can save the electrical consumption of the refrigerator by enhancing an operation capacity of a compressor by the use of a transformer. SOLUTION: At the time of normal operations, voltage from a power supply is applied to a first control relay 6 switched over to a contact 10 at the side of a transformer, and to a compressor 1 by way of a second control relay 7 switched over to a contact 14 at the power supply side so as to let the compressor to be operated. At this time, a contact 11 at the transformer side of the first control relay 6 is opened so as to allow no electricity to be turned on to the transformer 3, causing no loss. At the time of high loading, the first control relay 6 is switched over so as to allow the transformer to be energized, and the second control relay 7 is simultaneously switched over to a contact 15 at the transformer side so as to allow electric power increased in voltage by the transformer 3 to be applied to the compressor 1, so that an operation high in output can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an operation circuit for operating a compressor of a refrigerator.

[0002]

2. Description of the Related Art A compressor of a refrigerator is required to have a sufficient cooling capacity even when a cooling load in the refrigerator is high. That is, at the time of pull-down operation immediately after turning on the power, at the time of restarting the cooling operation after defrosting (at this time, the inside temperature rises), or at the time when the inside of the inside is full of storage, and Items with high
Alternatively, a compressor having a sufficient cooling capacity is set in anticipation of a time when the cooling load is maximized, such as when a large amount of outside air invades due to opening and closing of the door and the inside temperature rises.

[0003]

Therefore, during stable normal operation other than at the time of high load as described above, the compressor is operated with a margin, so that extra power is consumed as a result. I have.

FIG. 2 shows a conventional compressor operating circuit, in which a power supply voltage (AC) is controlled using a controller 20 such as a relay RY.
100 V) is turned ON / OFF as it is to operate the compressor 22 having a sufficient capacity. However, in this circuit, the compressor 22 cannot be operated according to the load fluctuation of the refrigerator.

[0005] As an example of changing the capacity of the compressor 23 in accordance with the load fluctuation, as shown in FIG.
And a circuit in which a controller 25 using a relay RY performs switching such that a high supply voltage (step-up by a transformer) is applied when a capacity is required and a low voltage (power supply voltage) is normally applied in a normal state. Has been proposed.

[0006] However, in the circuit of FIG.
Since the connection line 26 for supplying power to the power supply is always energized, there is a problem that the loss in the transformer 24 always occurs.

The present invention solves the above problems,
By using a transformer, the compressor can be operated in response to load fluctuations, and power can be saved by configuring the operation circuit so that the transformer is energized only when the load is high and not normally energized. An operation control device for a refrigerator is provided.

[0008]

In order to solve the above problems, the present invention provides a compressor for driving a refrigerator to cool, a power supply voltage supplied to the compressor, and a transformer for boosting the power supply voltage. An operation control device for a refrigerator that supplies the power supply voltage to the compressor during normal operation, and supplies the power supply voltage by boosting the power supply voltage by the transformer during a high load, and supplies a voltage supplied from the power supply voltage. A first control relay for switching between the compressor side and the primary winding side of the transformer, and a second control relay for switching a voltage supplied to the compressor between the power supply voltage side and a secondary winding side of the transformer. And two control relays.

Further, during high load operation, the first control relay is switched to the transformer and the second control relay is switched to the transformer.

[0010] In the normal operation, the first control relay is switched to the compressor side.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an operation circuit of a compressor according to the present invention, in which 1 is a compressor, 2 is a power plug connected to a commercial power supply of 100 V, and 3 is a capacity of the compressor 1 according to a load change. The transformer is a transformer for supplying a voltage that can be operated by a compressor, and when the compressor 1 needs capacity, a boosted voltage is supplied.

A first control relay (RY) is connected to one power supply line 5A to which the compressor 1 is connected with a power supply.
1) 6 and a second control relay (RY2) 7 are interposed and connected in series.

That is, the first control relay 6 has two contacts at which a power supply side common terminal (COM) 8 and a switching piece 9 connected to the terminal 8 are switched, that is, a compressor side contact 10.
And a transformer-side contact 11.

The second control relay 7 has two contacts at which a compressor side common terminal 12 (COM) and a switching section 13 connected to the terminal 12 are switched, that is, a power source side contact 14.
And a transformer-side contact 15. The compressor-side contact 10 of the first control relay 6 and the power-supply-side contact 14 of the second control relay 7 are connected by wiring 16. 5B is the other power supply line.

The first control relay 6 has a transformer-side contact 11 for connecting the transformer 3 to a power source. The control relay 6 operates, and its switching section 9 is in the state indicated by the broken line in FIG. , The transformer 3 is connected to a power supply and is energized.

Since the first control relay 6 normally switches its switching section 9 to the compressor-side contact 10 as shown by the solid line in FIG.
Is in an open (NO) state. The primary contact (primary base line) of the transformer 3 is connected to the contact 11 on the open side.
3a is connected.

On the other hand, the second control relay 7 has a transformer side contact 15 for connecting the transformer 3 and the compressor 1, and the transformer side contact 15 is connected to the secondary side (2) of the transformer 3. Secondary winding)
3b is connected. Therefore, when the control relay 7 is operated and the switching section 13 is switched as shown by the broken line in the figure, the voltage boosted through the transformer 3 is applied to the compressor 1. I have.

In the above circuit configuration, the first control relay 6 and the second control relay 7 operate as follows.

That is, normally, the first control relay 6 has its switching intercept 9 as shown in the solid line diagram of the compressor side contact 11.
And the second control relay 7 has its switching section 13
Are connected to the power contact 14 as shown in the solid line diagram. Therefore, in this case, the compressor 1 is operated with the power supply voltage of the commercial power supply 100 V applied. This case is performed during the normal operation in which the load is low and the compressor 1 does not require too much capacity.

At this time, since the primary side 3a of the transformer 3 is open and disconnected from the power supply, no power loss occurs.

On the other hand, at the time of a high load such as a pull-down operation after turning on the power or a cooling operation after defrosting, the first control relay 6 changes its switching section 9 to a transformer-side contact 11 as shown by a broken line diagram. To the primary side of the transformer 3. At the same time, the second control relay 7 also has its switching section 13
Is switched to the transformer side contact 15 as shown in the broken line diagram,
The compressor 1 is connected to the secondary side of the transformer 3. As a result, the transformer 3 is connected to the power supply voltage, and power is supplied to the primary side 3a, so that the secondary voltage boosted by the transformer 3 is applied to the compressor 1. For this reason, the operating capacity of the compressor 1 is improved, and it is possible to cope with a high load state.

With the operation circuit of the compressor 1 as described above, the transformer 3 is energized only when the compressor 1 requires the capacity, and is not energized during the normal operation, so that the loss of the transformer 3 during the normal operation is reduced. No large power saving effect can be obtained. In this case, it is desirable to pay attention to the following points when selecting the compressor 1 and the transformer 3.

That is, the compressor 1 is selected such that the power supply voltage is the most efficient at the time of normal stability, and the output voltage of the transformer 3 is determined so that the compressor 1 can survive a high load. It is.

In addition, if the transformer 3 is used, the transformer 3 is inevitably lost, so it is better not to use it for a long time. Considering the case of cooling a refrigerator by switching between two operations, that is, a normal operation and a high load operation, in a normal refrigerator usage mode, the high load operation is a short period only under specific conditions, Is normally stable operation. Therefore, it is desirable that the compressor 1 be operated with the power supply voltage as it is and that the transformer 3 be not supplied with electric power during normal stability. Then, only when the load is high, the voltage is raised by the transformer 3, the cooling is performed rapidly, and the normal stable operation is quickly switched, which can further contribute to power saving.

Incidentally, the operation of the refrigerator of the present application during normal stability is as follows.
When the temperature reaches a preset lower limit temperature, the compressor 1 stops, and when the temperature reaches a preset upper limit temperature, the compressor 1 starts operating.

The second control relay 7 has a role of switching connection between the transformer 3 and the compressor 1.
It can also function as a control switch for N / OFF control. That is, for example, during normal operation in which the switching section 9 of the first control relay 6 is switched to the compressor-side contact 10, if the temperature in the refrigerator reaches a preset lower limit temperature, the first control relay 6 While the switching section 9 is switched to the compressor side contact 10, only the second control relay 7 switches the switching section 13 to the transformer side contact 15 to stop the compressor 1. When the temperature rises to the preset upper limit temperature, the power can be switched again to the power supply side contact 11 so as to operate the compressor 1 again to maintain the predetermined internal temperature.

As described above, since the second control relay 7 can also be used as a relay for ON / OFF control of the compressor, there is no need to provide a separate dedicated changeover switch, and the effect of reducing the number of parts can be obtained. .

The above operation is summarized as follows. (1) When the compressor is ON during normal operation, the switching section 9 of the first control relay 6 is switched to the compressor side contact 10, and the switching section 13 of the second control relay 7 is switched to the compressor side contact. It is switched to 14. (2) When the compressor is OFF during normal operation, the switching section 9 of the first control relay 6 is switched to the compressor side contact 10, and the switching section 13 of the second control relay 7 is switched to the transformer side contact. It is switched to 15. (3) During high-load operation, the switching piece 9 of the first control relay 6 is switched to the transformer contact 11, and the switching piece 13 of the second control relay 7 is switched to the transformer contact 15. (4) When the switching piece 13 of the second control relay 7 is switched to the compressor contact 14 while the switching piece 9 of the first control relay 6 is switched to the transformer contact 11, the compressor 1 is turned on. Although the operation is stopped, such a switching state is not performed because a voltage is supplied to the transformer 3 and a loss occurs.

Some relays switch the switching piece to one contact A when a control voltage is applied, and switch the switching piece to the other contact B (normally open contact) when no control voltage is applied. I do. When such a relay is used, the first control relay 6 is switched to the compressor-side contact 10 for most of the time. By setting the contact 11 to the contact B described above, further power saving can be achieved.

Regarding the second control relay 7, if the time during which the switching between the power supply voltage side contact 14 and the transformer side contact 15 is longer is determined as the above-mentioned contact B, further power saving can be achieved. It is.

[0032]

As described above, according to the present invention, when the capacity of the compressor can be changed by using the transformer, the transformer is not energized during the normal operation in which the power supply voltage is applied. Therefore, the compressor can be operated without any loss in the transformer.

The second control relay, which is connected in series with the first control relay and switches the connection of the compressor from the power supply voltage to the transformer side, has a switching section from the power supply side to the transformer side. The switching operation in the opposite direction can be used as a control switch for turning the compressor ON / OFF, so that the number of parts can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an operation circuit of a compressor according to the present invention.

FIG. 2 is an operation circuit of a compressor shown as an example of the related art.

FIG. 3 is an operation circuit of a conventional compressor to be improved by the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Power plug 3 Transformer 6 First control relay 7 Second control relay 11 Transformer side contact

Continued on the front page (72) Inventor Norio Matsumoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term (reference) in Sanyo Electric Co., Ltd. 3H045 AA02 AA09 AA12 AA27 BA28 BA32 BA40 CA24 EA16 3L045 AA02 BA01 CA02 DA02 LA07 PA06

Claims (3)

[Claims] 1. A compressor for cooling and driving a refrigerator, a power supply voltage supplied to the compressor, and a transformer for boosting the power supply voltage, wherein the power supply voltage is supplied to the compressor during normal operation. An operation control device for a refrigerator that boosts the power supply voltage by the transformer at a high load and supplies the boosted power supply voltage to the compressor and the primary winding of the transformer. A first control relay;
An operation control device for a refrigerator, comprising: a second control relay for switching a voltage supplied to the compressor between the power supply voltage side and a secondary winding side of the transformer. 2. The operation of a refrigerator according to claim 1, wherein during high load operation, the first control relay is switched to the transformer side and the second control relay is switched to the transformer side. Control device. 3. The operation control device for a refrigerator according to claim 1, wherein during the normal operation, the first control relay is switched to the compressor side.