CN2192014Y

CN2192014Y - Electronic temp. controller for refrigerator

Info

Publication number: CN2192014Y
Application number: CN 94209741
Authority: CN
Inventors: 刘建周; 鲁保启; 吕世沛
Original assignee: HUAXIA SCIENCE AND TECHNOLOGY INDUSTRY Co Ltd TIANJIN
Current assignee: HUAXIA SCIENCE AND TECHNOLOGY INDUSTRY Co Ltd TIANJIN
Priority date: 1994-05-03
Filing date: 1994-05-03
Publication date: 1995-03-15
Anticipated expiration: 2004-05-03

Abstract

The utility model provides an electronic temp. Controller for a refrigerator. In the utility model, the sampled signal of an electric source is transferred to an over-voltage and under-voltage comparator, and the compared signal and the signals of the temperature sampling and the temperature setting, compared with a temperature comparator, are used as the control signal of a compressor. The temperature-control range 10DEG. C-30DEG. C is realized, the control precision is improved, and the electric source protecting control is realized; in addition, the electronic temp. Controller for a refrigerator is provided with a temperature display.

Description

Electronic temp. controller for refrigerator

Present technique relates to the electron temperature automatic controller of refrigerator, refrigerator.

The refrigerator that can seem on the current market, the Automatic Temperature Control of refrigerator all are mechanical temperature controllers.Its operation principle is, the expanding with heat and contract with cold of the metal capillary by fluorine Lyons, and then promote metal spring leaf, as long as regulate the distance that electrically contacts between reed, can reach temperature control.Owing to be mechanical, following deficiency is arranged on performance, at first control the narrow range of temperature, generally at-9 ℃～-28 ℃.As freezing, can meet the demands fully, but, then can not meet the demands in the purposes utmost point 10 ℃～-9 ℃ of refrigerated storage temperature sections widely.People press for this temperature section satisfy to food, vegetables, melon and fruit, beverage etc. fresh-keeping, refrigeration.Its two, do not have power protecting circuit, the commercial power supply instability is one of major reason that causes compressor damage.(high pressure is not higher than 242V, and low pressure is not less than the international voltage normal running conditions that 187V is civil power 220V) in order to solve this contradiction, many production of units refrigerator, refrigerator protector, but also therefore increased the weight of consumer's burden, and used also inconvenient.Its three, temperature control precision is not high, generally at ± 5 ℃.This precision might the freezing article of hiding when refrigeration.

The purpose of this utility model is: a new refrigerator, refrigerator electronic temperature controller are provided, and it can satisfy 10 ℃ to-30 ℃ temperature control, go precision reach ± 1 ℃, and designed corresponding power supply protection circuit.

The utility model is achieved in that (see figure 1) the utility model circuit working principle is design like this:

1). taken a sample through power supply sample circuit 1 by the signal that civil power provides, send into over-voltage detection circuit 6 and undervoltage detection circuit 5, over-voltage detection circuit 6 and undervoltage detection circuit 5 detected signals are admitted to OR circuit 7;

2). the temperature signal that temperature sensing circuit 2 is accepted is admitted to temperature comparison circuit 4, and the temperature signal that temperature setting circuit 3 sets also is admitted to temperature comparison circuit 4, and its signal that compares is admitted to OR circuit 7;

3). the signal that OR circuit 7 sends is delivered to control circuit 9, the relay of connection or close compressor after being prolonged five minutes by delay circuit 8.Physical circuit is as follows: power supply sample circuit 1 is finished by collection layer elements 7815.Temperature sensing circuit 2 is by thermistor Rr and resistance R ₆Constitute.Temperature setting circuit 3 is that Vcc voltage is at R ₇, R ₈, R ₉On the signal chosen of dividing potential drop, R ₈It is potentiometer.Temperature comparison circuit 4 is made of comparison circuit ID1-3, and IC1-3 selects for use collection layer elements 555 to finish.Over-voltage detection circuit 6 is by resistance R ₁, R ₂, R ₃, R ₄, R ₆Constitute with comparator IC1-1, IC1-1 selects collection layer elements 555 for use, and undervoltage detection circuit 5 is by R ₁, R ₂, R ₃, R ₄, R ₆Constitute with comparator IC1-2, IC1-2 selects element 555 for use.IC2 is an OR circuit.IC3 is a monostable circuit, it and C ₁Form delay circuit.Comparator in the circuit compares two-way input, output be the variance signal that is produced after the comparison.Since the assurance of each components accuracy, the precision that whole utility model is regulated temperature can reach=1 ℃.By R ₈Can guarantee between 10 ℃～-30 ℃, to regulate arbitrarily, choose refrigeration or freezing.To the sampling of power supply signal, send into overvoltage and undervoltage detection circuit simultaneously, as testing circuit (interchange 240V to 178V) when operate as normal is interval, overvoltage or undervoltage detection circuit output services voltage normal signal, compressor keeps normal operating conditions; When non-normal working is interval, cross Yan'an or undervoltage detection circuit output abnormality signal, OR circuit then sends off signal, and compressor shuts down immediately, thereby has protected compressor.When by entering unusually just often, for certain safety is arranged, delay circuit postpones starting-up signal to send in five minutes.The utility model also is connected to light emitting diode at the temperature setting circuit delivery, and the user can observe the actual temperature of present refrigerator or refrigerator at any time.

Present technique has following advantage, 1). widened the temperature regulating range of refrigerator, refrigerator, can freezingly can refrigerate again.2). increased defencive function, reduced the spoilage of compressor compressor.3). improved temperature controlled precision.4). increased temperature indicator.

The utility model has following accompanying drawing:

Fig. 1 is the utility model electricity functional-block diagram;

Fig. 2 is the utility model circuit diagram.Each label is among the figure:

Power supply sample circuit 1, temperature sensing circuit 2, temperature setting circuit 3, temperature comparison circuit 4, undervoltage detection circuit 5, over-voltage detection circuit 6, OR circuit 7, delay circuit 8, control circuit 9, compressor relay circuit 10 and power circuit 11.

Claims

1, a kind of refrigerator, refrigerator electronic temperature controller, its circuit are by 1 sampling of power supply sample circuit, compare through undervoltage detection circuit 5 and over-voltage detection circuit 6, and output overvoltage or under-voltage signal are to OR circuit 7; The signal that temperature signal that temperature sensing circuit 2 detects and temperature setting circuit 3 are set, deliver to temperature comparison circuit 4, the gate circuit 7 delivered to of the signal after relatively, the control that realizes compressor through delay circuit 8, control circuit 9, it is characterized in that undervoltage detection circuit 5 is by R ₁, R ₂, R ₃, R ₄, R ₅Constitute with comparator IC1-2, over-voltage detection circuit 6 is by R ₁, R ₂, R ₃, R ₄, R ₅Constitute with comparator IC1-1, temperature comparison circuit 4 is made up of comparator IC-3, its two signal relatively, and one is through Rr and R by Vcc ₆Dividing potential drop provides, one by Vcc through R ₇, R ₈, R ₉Dividing potential drop provides.

2, temperature controller according to claim 1 is characterized in that, comparator IC1-1, IC1-2 and IC1-3 select collection layer elements 555 for use.

3, temperature controller according to claim 1 is characterized in that, Rr selects thermistor for use.