JPS6166067A - Defrostation control circuit for cooler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a defrosting control circuit for a cooler that controls the defrosting operation of a cooler such as a refrigerator.

[Technical background of the invention]

Traditionally, for example, cold air from a cooler? In fan-cooled refrigerators that use a fan to circulate air inside the freezing chamber, a groove-type refrigerator is being considered so that the cooler starts defrosting operation every time the compressor ends its operating time. .

[Problems with background technology]

In the above-mentioned conventional configuration, if the refrigerator's power is momentarily cut off, the electronic timer circuit is reset even during the timing operation, so when the refrigerator returns from stop A, the timer circuit starts timing operation from the beginning. Therefore, the time it takes to start the defrosting operation of the cooler becomes longer than 30 hours compared to the above-mentioned set time, and the problem is that the cooler becomes overloaded.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooler removal control circuit that can reliably prevent the cooler from becoming over-frozen even in the event of a power outage. .

[Summary of the invention]

The present invention outputs a power detection signal when the power is turned on.
F! The L power state lateral state detection circuit is configured to immediately start defrosting operation when this power supply detection signal is output, and as a result, frost formation occurs in the cooling operation up to the point in time when there is a power outage. It is something that should be removed each time.

[Examples of breakthrough inventions]

The present invention will be applied to a refrigerator and will be explained with reference to the drawings. Reference numeral 1 denotes a control terminal, which is connected to a freezing room temperature detection circuit (not shown), and receives a high level ν signal when the temperature of the freezing room rises above a set temperature. The controller TV terminal 1 is connected to one input terminal of an AND circuit 2, and the output terminal of the AND circuit 2 is a compressor (not shown)! Connected to the IIK solicitation circuit. Then, the next time the freezer compartment rises above the set temperature, AND circuit 2
On the condition that the other input terminal of is at high level ν, the compressor is driven to supply refrigerant to the cooler (not shown), and the fan device is also driven to supply cold air generated near the cooler to the freezer and refrigerator compartments. A cooling operation is performed.

Reference numeral 3 designates a timer circuit which measures the time while the input terminal 8 is at HIREPE ν, and outputs a HIREPE/v@ number to the output terminal Q when a predetermined period of time, for example 30 hours, has been accumulated.

The input terminal 8 of the timer circuit 5 is connected to the input terminal 1 and the output terminal Q is connected to one input terminal of the OR circuit 4. Therefore, the cumulative operating time of the compressor is 3
When the time reaches 0 hours, the output terminal of the OR circuit 4 outputs one defrosting start signal 8A of high level ν. The output terminal of the OR circuit 4 is connected to the set terminal SVO of the 7 reset defroster 5, and when the defrost start command is given to the set terminal 8, the output terminal Q is maintained at a high level ν and defrost operation (not shown) is performed. - energize the F defrost heater and heat the cooler to cool the frost? A defrosting operation is performed to melt and remove the frost. A defrosting completion detection circuit 6 is attached to the cooler and includes a cooler temperature sensor 7. When the frost is removed by the defrosting operation and the temperature of the cooler rises, the cooler temperature sensor 7 detects the temperature rise, that is, the completion of defrosting, and the defrosting completion detection circuit 6 resets the flip-flop 5. The high-reply picture number is output to the terminal hole, thereby dropping the output terminal Q of the flip-flop 5 to the low-reply number ν, thereby ending the defrosting operation. The output terminal of the flip flap 50 is connected to the other input terminal of the AND circuit 2 and the reset terminal hole of the timer circuit 3, and resets the timer circuit 5 at the beginning of the defrosting operation. This prevents the compressor from being driven during operation. Now, 8 is a power state detection circuit, which is connected in series with a resistor 9, a capacitor 10, and their connection point ai.
It consists of a C-connected inverter circuit 11. A DC voltage obtained by rectifying the AC voltage of the power supply (commercial power supply) supplied to the refrigerator is applied to both sides of the series circuit of the resistor 9 and the capacitor 10, with the resistor 9 side being positive, and the output terminal of the inverter circuit 11. It is connected to the other input terminal of the OR circuit 4.

Next, the operation of the above configuration will be described. It is assumed that power is normally supplied to the refrigerator. In this case, the potential at the connection point a of the power state detection circuit 8 is at high level ν, the inverter circuit 11 is outputting low level Vl, and the potential at the output terminal QH low level tv of the timer circuit 3 is removed from the OR circuit 4. 8 people will be output once the frost starts. Then, based on the word given to the control terminal 1 from the freezer room temperature detection circuit, when the temperature of the freezer compartment is higher than the predetermined temperature column, the compressor is activated and the cooling operation is started, thereby maintaining the interior of the freezer compartment at the predetermined temperature. be done. Since the set terminal S of the timer circuit 3 becomes high level ν every time the compressor is driven, the operating time of the compressor is accumulated. When the cumulative time reaches 30 hours, the output terminal Q of the timer circuit 5 becomes the high level ν, so the OR circuit 4 outputs the defrosting start code S of the high level ν to the flip-flop 50 set terminal Q.
is output. As a result, the output terminal Q of the flip-flop 5 is switched to the high level ν, and the defrosting operation is executed. When the defrosting of the cooler is completed, the defrosting completion detection circuit 6 outputs a high level signal 100 to the reset terminal of the flip-flop 5, the defrosting operation is completed, and the timer circuit 6 is reset. Below, this is calculated as the cumulative operating time of the compressor.
Excessive frosting on the cooler is prevented by repeating each time the time reaches 0 hours.

Now, as mentioned above, put it in the fridge! Unlike the case where the power supply is continuously provided, the power supply will be restored after seven hours if there is a power outage. In the event of a power outage, the E-timer circuits 5 and 7 are reset to four reset states. When the power is turned on after recovering from a power outage, a charging current flows through the capacitor 10 of the power state detection circuit 8 that was discharged during the power outage, so that the potential at the connection point ^ gradually reaches the high level ν from the low level ν. At this time, when the power is turned on, when the connection point a is at the low repeater ν, the power supply detection signal BE of the high repeater M is outputted from the inverter circuit 11 to the other input terminal of the OR circuit 4, and therefore the OR circuit 4 immediately The defrosting start signal S is outputted to the set terminal S of the flip-flop 5, and the defrosting operation starts. This will ensure that the cooler is ready for the next cooling operation that was carried out by the time the power outage occurred.7?1. Since the frost is removed, if the cumulative operating time of the compressor does not reach 30 hours after returning from a power outage, defrosting operation will start.9Unlike conventional systems, there is no risk of excessive frost forming in the cooler. Indeed, it is something that can be prevented.

By the way, as a means to prevent overloading of the cooler due to the reset of the timer circuit due to a power outage, an auxiliary timer circuit is provided which outputs a signal to start defrosting in a shorter cumulative time than the above-mentioned timer circuit. When the compressor returns to normal operation, an auxiliary timer circuit may be used to integrate the operating time of the compressor thereafter. However, with this configuration, if a power outage occurs repeatedly within the cumulative time of the auxiliary timer circuit, a problem will arise in which defrosting will not occur and the cooler will end up in an over-frozen state. .

On the other hand, if the present example is implemented, as described above, after the power outage is restored, the power status detection circuit 8 detects it and the defrosting operation is immediately carried out, so that a momentary power outage can be avoided in a short period of time. Even if it is repeated nine times, it is possible to reliably prevent the cooler from reaching an over-N frost condition.

In addition, although the above *winding example shows application to a refrigerator, the present invention is not limited to this, and can be modified in various ways without departing from the gist, such as application to a refrigerated showcase, etc. .

〔Effect of the invention〕

As described above, the present invention is characterized in that the defrosting operation is stopped immediately when the power is turned on.

As a result, the 9M frost that occurs during the cooling operation up to the point in time when a power outage occurs can be removed each time after the power outage returns, so even if there is a temporary power outage, the power outage will not be repeated within a short period of time. Even in the case where the cooler is overloaded, it is possible to reliably prevent the cooler from reaching an overloaded state.

[Brief explanation of the drawing]

1 is a circuit diagram showing an example of a central foam according to the present invention; FIG. In the drawing, 3 is a timer circuit, 6 is a repair completion detection circuit, and 8 is a power state detection circuit.

Claims (1)

[Claims] 1. In a system that integrates the operating time of the compressor using a timer circuit and outputs a defrost start signal for the cooler at every predetermined integrated time, a power state detection circuit that outputs a power detection signal when the power is turned on is installed. A defrosting control circuit for a cooler, characterized in that the defrosting start signal is outputted immediately upon outputting the power supply detection signal.