JPS5956677A - Refrigerator defrost control circuit - 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] [Field of Application of the Invention] The present invention relates to a refrigerator defrosting control circuit that integrates the operating time of a compressor and varies the cumulative time depending on the ambient temperature of the refrigerator, thereby varying the defrosting interval. be.

[Prior art]

Conventionally, this type of refrigerator defrosting circuit integrates the operating time of the compressor and starts defrosting when the integrated time reaches an arbitrarily determined time. The operating time (operating rate) of the S1 compressor varies depending on the ambient temperature of the refrigerator (winter, summer). Furthermore, the environmental conditions of the refrigerator are different in winter and summer, and the M of 1■ attached to the refrigerator cooler becomes +Jυ. The dead time period that determines the defrosting interval is set to 1 or more during the summer season when the amount of frost is greatest. However, even in the winter when the amount of M q is small, the bond initial time is the same as in the summer, and defrosting starts when the summer time is reached even though the amount of frost is small. That is, since defrosting is forcibly performed even though there is no need to defrost, power is wasted. In addition, the surrounding temperature of the refrigerator is detected by 1 degree, W1 degree, and the accumulated time in winter and summer is switched. Even in this case, it is not possible to accurately detect the ambient temperature from the surroundings of the refrigerator and the heat dissipation of the condenser. I'm in trouble. Furthermore, if the accumulated time is always set to winter jυ1 due to a malfunction of the temperature sensor or a faulty sensor, the cumulative time of summer jυJ
This method had disadvantages such as the cooling capacity of the cooling device becoming too small and the cooling power becoming low.

[target of invention]

The present invention has been made to improve these drawbacks, and provides a circuit that accurately detects the temperature around the refrigerator, changes the integrated defrosting time between winter and summer, and also compensates for the operation of the temperature detector. It has been established.

[Summary of the invention]

The present invention will be explained based on examples. FIG. 1 shows an embodiment of the present invention, in which a microcomputer (hereinafter referred to as a microcomputer) processes human power from an increaser, JJ, etc., starts defrosting (timer function), returns, and - Has functions such as input switching of amplifier. 2 increases the number from the detector [1
], the output i) is input to the microcomputer 1. 3 is a temperature detector (hereinafter referred to as a thermistor) 4 (d
, connected to each / Lease by a fixed resistor and its midpoint d
, is connected to the human power (+ terminal) of the amplifier 2. 5
．． 6 is a fixed resistor that determines the switching temperature (1j), which is connected to each node, and whose midpoint is the human power of the intensifier 2 (1).
one terminal (-). 7 is a fixed resistor connected from the output a of the microcomputer 1 to the human power of the amplifier 2.

The resistor 7 is always intermittently connected in series to the resistor 5 by the a output of the microco/1. 8 is a defrost return signal generation circuit consisting of a temperature detector attached to the cooler, an amplifier, etc., and the output is manually input to the microcontroller 1. 9 indicates the operation of microcomputer 1 and each: l1ll Bll
I, 7 students, 6 basic students. If there are 2 dings and 1 fuillon/
This has been entered. Also, it is a buffer that transmits the output signal of 10ifli start and return, and 1i fixed resistor,
12 is a defrost heater, temperature heater, AC control (ITL
This is an AC circuit composed of 1 element T-, etc.・； 、
The output of -7r' 10 is connected to the AC circuit -C through a resistor 11. DC type with 13 control elements (1!
There is i-U. Also, ■ is the stop of the compressor (No. 8).

As shown in Figure 2, the setting of the so-called accumulation time is the set time in summer (
For example, if the IJ switching temperature exceeds I)1, the TI will increase even once within 8 hours (τ1).
'L' level from the output of unit 2 [language controller 1
When the compressor is operated manually for 8 hours, the output of microcomputer I increases by +3 (OIJ'+゛111).

"I-1" becomes l/bell and defrosting starts. In addition, when the ambient temperature C2 is always lower than L7 or the conversion temperature J)l, the output of the amplifier 2 is always at the "14" level, and the output 1) (OUT, b2) of the microcomputer 1 is the winter integrated value. When the time (e.g. 14 hours, τ2) is reached, 'l-
1" level and starts defrosting.Furthermore, during the cumulative time of 8 hours (τ1) to 14 hours (τ2), the ambient temperature
3 exceeds the switching temperature 1)■, the output of the amplifier 11J 2 becomes 'L' level, and at that point the output 1) (0(IT l)3) of the microcontroller 1) goes to the 'II' level. When the temperature of the cooler reaches the arbitrarily set temperature, defrost recovery is activated by the generating circuit 8, which sends a signal to the microcomputer 1, but the output of the microcomputer 1 is 1) to °L・“Levenoshi” and stir to remove the frosting.

The timing of ambient temperature detection is the compressor stop 1 unit [signal [
(The compressor is set to start operating after a certain period of time using a stop timer that starts operating from the operating temperature.) Several minutes before the compressor starts operating (for example, 2 minutes before ) It is determined by the microcomputer 1 to be performed before starting operation. Furthermore, the potential at the input point (2) of the amplifier 20, which determines the switching temperature, is alternately switched between two levels as shown in FIG. 3 by the output a of the microcomputer 1.

If the ■ point potential d in the 18 area and the thermistor 3 is disconnected, there is a level -C that detects a failure, etc., and if the output of the amplifier 2 is at the °゛■・'' level in the 1.] area, the thermistor 3 is normal. Yes, the temperature is detected at the set level in the 1-area.Furthermore, it increases in the E area.If the output of 11J52 is at the ``I'' level, the integrated defrosting time is set to summer (8 hours) regardless of the ambient temperature. Although the present invention has explained the control in the case using a micro combination, it is also possible to perform the same production using ordinary gates, timers, etc.
Needless to say.

[Embodiments of the invention]

The present invention uses a thermistor 3 to detect the ambient temperature of the refrigerator,
In addition, the control of the burning time (timer function) and the processing of the switching temperature No. 18 from the 1-piece device 2, the defrosting recovery, and the processing of the bow are performed with the microconbeater 1, and further increase +1-]
The human power of the device 2 was alternately switched to two levels of potential, and the voltage level of the - voltage was set as the failure detection level of thermistor 3, and the voltage level of the other was switched for 9 hours to set the temperature level. Furthermore, the timing of temperature detection was set from several minutes (for example, 2 minutes) before the compressor started operating to between the times when the compressor started operating. As a result, the ambient temperature of the refrigerator can be detected accurately without being affected by the heat radiation of the refrigerator condenser, etc., and there is no possibility of incorrect integration due to improper installation of the thermistor 3 (there is no mountain setting, and the integration time can be switched between winter and summer. can be done like IE.

〔Effect of the invention〕

As described above, the present invention not only eliminates wasteful defrosting by switching the cumulative shielding time to winter and 9 periods, but also detects the ambient temperature when the compressor is stopped, unaffected by heat radiation from the refrigerator condenser, etc. The compressor is set at MiJ when the compressor starts operating, so that the ambient temperature of the refrigerator can be accurately detected.Furthermore, if the temperature sensor is incorrectly installed, it is automatically set to the summer cumulative time (8 hours), and the frost filling is stopped. The effect is outstanding in terms of power saving, such as preventing the cooling power from decreasing due to factors such as the cooling effect, and the control circuit.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the refrigerator defrost control circuit T11 of the present invention, Fig. 2 is a dynamic diagram of the refrigerator defrost control circuit of the present invention, and Fig.
Figure 3 is a voltage waveform diagram at point d [increase + lJ machine manual power]. 1 ・-Fikk r7 conopi・ta, 2・increase] IJ device, 3
・Hastefulness 1] 1. 4.5.6.7...Fixed resistor, 8.Defrost recovery 18 output generation circuit, 9.Clock generation source, 10..No.R111.Fixed resistor, 12.
- Fencing AC circuit, 1:3 - DC power supply. Representative Patent Attorney Usui 1) Interest P% + (ヲ〕j:,a

Claims (1)

[Claims] In a 1L refrigerator that integrates the operation time of the compressor and starts defrosting when the storage time reaches an arbitrarily set time, the ambient temperature of the storage compartment is detected by a temperature detector. 2, by combining an intensifier that converts the signal into an electrical No. 8 signal and a timer that determines the temperature detection timing and cumulative time, the temperature around the refrigerator within a certain period of time is set arbitrarily. 1 than temperature
The refrigerator defrosting control circuit is designed to shorten the cumulative time when the temperature is higher than the set temperature, and to lengthen the cumulative time when the temperature is lower than the set temperature. 2. The refrigerator defrost control circuit 1 according to claim 1, wherein the timing of detecting the ambient temperature of the refrigerator is from several minutes before the compressor starts operating to before the compressor starts operating. 3 Input two different voltages alternately to one side of the intensifier rlr that emits No. 8 rlJL from the temperature sensor, and switch the integration time and emit No. 18. 7. When one voltage is input, the amplifier output is A patent claim in which the integration time is shortened if the output is at the "H" level, and if the output is at the "L" level, the output is made to depend on the amplifier output when the other voltage is input, thereby shortening the integration time. Refrigerator frost and 9th monk listed in item 1]
circuit.