CN202470613U

CN202470613U - Refrigerator temperature controller made of NE555

Info

Publication number: CN202470613U
Application number: CN2012200287949U
Authority: CN
Inventors: 王寅寅; 何林
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-01-29
Filing date: 2012-01-29
Publication date: 2012-10-03
Anticipated expiration: 2022-01-29

Abstract

The utility model relates to a refrigerator temperature controller made of NE555. The refrigerator temperature controller made of NE555 is composed of a 220 volt alternating current power supply, a resistance-capacitance reduction-voltage circuit, a full bridge rectification circuit, a 1.2 volt voltage-stabilized source, a bistable timing circuit, a relay control circuit, a refrigerator outlet and a working condition indicating circuit. When property of a refrigerator temperature controller is worsened or damaged, or a new temperature controller is hard to arrange temporarily, or freezing medium of a compressor is leaked slightly while the compressor does not stop and the like, the refrigerator temperature controller made of NE555 can meet emergencies. The refrigerator temperature controller made of NE555 takes the principle of not changing a circuit and an inner structure of an original refrigerator, and enables the refrigerator to be used conveniently and electricity to be used safely. By means of the refrigerator temperature controller made of NE555, damage caused by the compressor being in long-term operation without a halt can be eradicated, service life of the compressor of the refrigerator can be prolonged, unnecessary electricity waste can be reduced, and safe use of electricity can be guaranteed.

Description

Refrigerator temperature controller with the NE555 making

Technical field

The utility model belongs to the electron controls technology field, relates to a kind of refrigerator temperature controller made from NE555.

Background technology

All carry temperature controller in the casing of refrigerator; But new refrigerator is after use in a few years; The temperature controller poor performance of some refrigerators is usually arranged and cause compressor not shut down, perhaps the compressor for refrigeration inner refrigerant has slight leakage and fault takes place not shut down etc.This type of fault is not too influence use generally, if but untimely processing harmfulness is very big, and the one, the compressor for refrigeration long-term operation is not shut down and can be made its fatigue and thorough the damage; The 2nd, compressor for refrigeration is not shut down for a long time can cause a large amount of power wastages; The 3rd, can lead to the potential safety hazard of refrigerator electricity consumption aspect.Because refrigerator volume, weight are all bigger, and the user is inconvenient to bring up to and is lifted down on-call maintenance.

In order effectively to solve this part refrigerator user's demand; On the basis that does not change original refrigerator circuit and internal structure; The utility model can address the above problem with the refrigerator temperature controller that NE555 makes, and the realization refrigerator can normally use the requirement with safety utilization of electric power.

Below specify the correlation technique content that this refrigerator temperature controller made from NE555 relates in implementation process.

The utility model content

Goal of the invention and beneficial effect: when the degradation of refrigerator temperature controllers or when damaging, or be difficult to be configured to for the moment new temperature controller, perhaps the cold-producing medium in the compressor has slight leakage and fault such as does not shut down.The described temperature controller of the utility model can be used as emergent the use.The utility model is a principle not change original refrigerator circuit and internal structure in design, makes refrigerator reach the purpose of electricity consumption easy to use, safe.Using it one is can stop that the compressor long-time running is not shut down and the harm that causes, helps to prolong the service life of compressor for refrigeration; The 2nd, can reduce unnecessary power wastage, ensure the Electrical Safety of refrigerator.

The circuit working principle: the circuit of the refrigerator temperature controller made from NE555 in fact its core is a bistable circuit.When controller circuitry is connected the 220V AC power; Because of 2 pin and 6 pin of time base circuit IC1 are low level; Then time base circuit IC1 triggers set; At this moment 3 pin of time base circuit IC1 become high level, and this moment, the coil no current of DC relay J made normally opened contact J-1 be in release conditions, and compressor for refrigeration does not have electricity and do not work.When electric current charges to timing capacitor C2 through potentiometer RP1; As time goes on; When the voltage at timing capacitor C2 two ends rose to 2/3 supply voltage VCC, time base circuit IC1 automatically reset, and made 3 pin of time base circuit IC1 become low level; The coil of the relay J that 3 pin of time base circuit IC1 are connect gets and makes normally opened contact J-1 adhesive, the compressor starts work of refrigerator after electric.Because 3 pin of time base circuit IC1 are low level; The threshold voltage of time base circuit IC1 is not 1/3 supply voltage; This moment, timing capacitor C2 was through 7 pin of potentiometer RP2 by time base circuit IC1, and promptly the internal discharge pipe discharges, when discharging into voltage on the timing capacitor C2 always and dropping to 1/3 supply voltage; The time base circuit IC1 set of overturning again makes 3 pin of time base circuit IC1 change high level again into.According to the components and parts value that circuit working schematic diagram and embodiment recommend, suitably the resistance of regulator potentiometer RP1～RP2 can make downtime, the available machine time of refrigerator be controlled at respectively 5～28 minutes.

Technical characterictic: with the refrigerator temperature controller of NE555 making; Be made up of 220V AC power, resistance-capacitance depressurization circuit and full bridge rectifier, 12V voltage-stabilized power supply, bistable state timing circuit, control relay circuit and refrigerator power socket and duty indicating circuit, its characteristic comprises:

The bistable state timing circuit: time base circuit IC1, potentiometer RP1, potentiometer RP2, switching diode D5 and timing capacitor C2 form; 2 pin of time base circuit IC1 and 6 pin connect the positive pole of timing capacitor C2, the end of potentiometer RP2 and the negative pole of switching diode D5; The negative pole connection circuit ground GND of timing capacitor C2; 7 pin of time base circuit IC1 connect the other end and the lever arm thereof of positive pole, the potentiometer RP2 of switching diode D5, an end and the lever arm thereof of potentiometer RP1; The anodal VCC of the other end connection circuit of potentiometer RP1, the anodal VCC of 4 pin of time base circuit IC1 and 8 pin connection circuits, the 1 pin connection circuit ground GND of time base circuit IC1;

Control relay circuit and refrigerator power socket: 3 pin of time base circuit IC1 connect an end of DC relay J coil and the positive pole of protection diode D6; The negative pole of the other end of DC relay J coil, protection diode D6 links to each other with circuit anode VCC; The stationary contact of the normally opened contact J-1 of the termination DC relay J of refrigerator power socket CZ; The movable contact of the normally opened contact J-1 of DC relay J meets the live wire end L of 220V AC power, the zero line side N of another termination 220V AC power of refrigerator power socket CZ;

Resistance-capacitance depressurization circuit and full bridge rectifier: form by decompression capacitor C1, bleeder resistance R1 and 4 silicon rectifier diode D1～D4; The movable contact of the live wire end L of the termination 220V AC power of the end of decompression capacitor C1 and bleeder resistance R1 and the normally opened contact J-1 of DC relay J, the other end of the other end of decompression capacitor C1 and bleeder resistance R1, the zero line side N of 220V AC power connect the alternating current input of full bridge rectifier respectively;

The 12V voltage-stabilized power supply: the positive pole of full bridge rectifier output meets negative pole and the circuit anode VCC of Zener diode DW, and the negative pole of full bridge rectifier output meets positive pole and the circuit ground GND of Zener diode DW.

Duty indicating circuit: form with dropping resistor R3 by LED 1 and dropping resistor R2, LED 2; The negative pole of LED 1 connects the end of dropping resistor R2; The positive pole of the other end of dropping resistor R2 and LED 2 connects 3 pin of time base circuit IC1; The anodal VCC of the anodal connection circuit of LED 1, connection circuit ground GND behind the negative pole serial connection dropping resistor R3 of LED 2.

Description of drawings

Accompanying drawing 1 is the circuit working schematic diagram with the refrigerator temperature controller of NE555 making; CZ is the supply socket of refrigerator in the accompanying drawing 1.

The specific embodiment

Specification requirement according to circuit working schematic diagram shown in the accompanying drawing 1 and description of drawings and the following stated is implemented, and can realize the utility model.

IC1 is a time base circuit in the accompanying drawing 1, and model is: NE555; Time-base integrated circuit IC1 is 8 pin DIP encapsulation, and each pin function: 1 pin is circuit ground; 2 pin are trigger end; 3 pin are output; 4 pin are reset terminal; 5 pin are control voltage; 6 pin are thresholding (threshold value); 7 pin are discharge end; 8 pin connect positive source;

DC relay J has 5 pin, and the coil of relay has 2 pin, and power output has 3 pin, and 3 pin are formed normally opened contact and normally-closed contact respectively, and J-1 is the normally opened contact of relay J in the accompanying drawing.

The selection of components and parts and technical parameter thereof

Element number	The components and parts title	Major parameter	Quantity	Remarks
					IC1	The time base circuit model is NE555	DIP encapsulation, 8 pin	1
D1～D4	1N4007 (silicon rectifier diode)	Plastic packaging, 1A/700V	4	Or 1N5408
					DW	Zener diode	12V、1W	1
D5～D6	Switching diode	1N4148 or 1N4002	2
					LED1、LED2	Light emitting diode	Red, green	2
R1	Resistance	510KΩ、1W	1	The step-down bleeder resistance
					R2、R3	Resistance		1/8W、910Ω	2	The step-down current-limiting resistance
RP1、RP2	Potentiometer	Linear, 1.6M Ω	2	Weldable
					C1	Electric capacity of the dacron	0.68μF/630V	1
C2	Electrochemical capacitor	1500μF/25V	1	Timing capacitor
					J	DC relay, JCZ-22F	Contactless power: 15A/250V	1	12V、90mA
CZ	Supply socket	15A/250V	1

Circuit production main points and circuit debugging

The timing length of circuit is definite by the value of electrochemical capacitor C2, potentiometer RP1 and potentiometer RP2 respectively, that is: T ≈ 1.1 * C2 * RP*; According to the time needs that the timing of refrigerator is opened or regularly closed, the capacity of electrochemical capacitor C2 can be selected in 1000 μ F to 1500 μ F scopes, and the maximum of potentiometer RP1 or potentiometer RP2 is 1.6M Ω; According to the technical parameter of above-mentioned components and parts, the maximum duration that the timing of circuit is opened or regularly closed is about 28 minutes;

Refrigerator temperature controller with NE555 makes in use can be according to the variations in temperature of Various Seasonal, and suitably the resistance of regulator potentiometer RP1 and potentiometer RP2 makes the minimum temperature of refrigerator and maximum temperature reach requirement.Maximum temperature and minimum temperature difference should be controlled at 6 ℃～10 ℃ in the case of refrigerator.Be not less than downtime under 5 minutes the situation at the each compressor for refrigeration of adjustment, per hour start shooting, shut down and be no more than 6 times respectively, otherwise compressor operating too frequently will influence the life-span;

According to the method that connects of components and parts in the circuit working schematic diagram in the accompanying drawing 1, and DC relay J use normally opened contact J-1, can effectively stop the 220V AC power and have a power failure when then restoring electricity again suddenly, cause the catastrophe failure of compressor for refrigeration stall.

Claims

1. refrigerator temperature controller made from NE555; Be made up of 220V AC power, resistance-capacitance depressurization circuit and full bridge rectifier, 12V voltage-stabilized power supply, bistable state timing circuit, control relay circuit and refrigerator power socket and duty indicating circuit, its characteristic comprises:

The bistable state timing circuit is made up of time base circuit IC1, potentiometer RP1, potentiometer RP2, switching diode D5 and timing capacitor C2; 2 pin of time base circuit IC1 and 6 pin connect the positive pole of timing capacitor C2, the end of potentiometer RP2 and the negative pole of switching diode D5; The negative pole connection circuit ground GND of timing capacitor C2; 7 pin of time base circuit IC1 connect the other end and the lever arm thereof of positive pole, the potentiometer RP2 of switching diode D5, an end and the lever arm thereof of potentiometer RP1; The anodal VCC of the other end connection circuit of potentiometer RP1, the anodal VCC of 4 pin of time base circuit IC1 and 8 pin connection circuits, the 1 pin connection circuit ground GND of time base circuit IC1;

3 pin of time base circuit IC1 connect an end of DC relay J coil and the positive pole of protection diode D6 in control relay circuit and the refrigerator power socket; The negative pole of the other end of DC relay J coil, protection diode D6 links to each other with circuit anode VCC; The stationary contact of the normally opened contact J-1 of the termination DC relay J of refrigerator power socket CZ; The movable contact of the normally opened contact J-1 of DC relay J meets the live wire end L of 220V AC power, the zero line side N of another termination 220V AC power of refrigerator power socket CZ;

Resistance-capacitance depressurization circuit and full bridge rectifier are made up of decompression capacitor C1, bleeder resistance R1 and 4 silicon rectifier diode D1～D4; The movable contact of the live wire end L of the termination 220V AC power of the end of decompression capacitor C1 and bleeder resistance R1 and the normally opened contact J-1 of DC relay J, the other end of the other end of decompression capacitor C1 and bleeder resistance R1, the zero line side N of 220V AC power connect the alternating current input of full bridge rectifier respectively.

2. the refrigerator temperature controller made from NE555 according to claim 1; It is characterized in that: the positive pole of the full bridge rectifier output in the 12V voltage-stabilized power supply meets negative pole and the circuit anode VCC of Zener diode DW, and the negative pole of full bridge rectifier output meets positive pole and the circuit ground GND of Zener diode DW.

3. the refrigerator temperature controller made from NE555 according to claim 1; It is characterized in that: the duty indicating circuit is made up of with dropping resistor R3 LED 1 and dropping resistor R2, LED 2; The negative pole of LED 1 connects the end of dropping resistor R2; The positive pole of the other end of dropping resistor R2 and LED 2 connects 3 pin of time base circuit IC1; The anodal VCC of the anodal connection circuit of LED 1, connection circuit ground GND behind the negative pole serial connection dropping resistor R3 of LED 2.