CN2104414U

CN2104414U - Electronical temp. control unit for refrigerator

Info

Publication number: CN2104414U
Application number: CN 91202186
Authority: CN
Inventors: 王接枝; 王作明
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-02-06
Filing date: 1991-02-06
Publication date: 1992-05-13

Abstract

The utility model discloses an electronic temperature control unit for a refrigerator, comprising a direct current stabilized voltage power supply, an oscillating circuit, a counting circuit, a relay on-off control circuit and a protective switch circuit. The electronic temperature control unit for a refrigerator is arranged out of the refrigerator and is compatible and complementary with the original mechanical temperature control unit of the refrigerator. The electronic temperature control unit adopts the exponential relation of the reverse-current reversely biased to a PN knot and the room temperature as the range of the down time when a sensing element and the corresponding circuit achieve to be automatically regulated in the different room temperatures and accompany with the protective functions of the momentary power failure and the overcurrent protection. The utility model has the advantages of simple structure, low cost and convenient operation.

Description

Electronical temp. control unit for refrigerator

The utility model relates to a kind of refrigerator electron temperature controller in the control device of attached to refrigerator, mainly TEMP spare and the circuit that correspondingly constitutes is improved, and is useful in case and regulates oven temperature, outward, and other has the defencive function of refrigerator operation concurrently.It comprises following architectural feature: by controllable silicon, unijunction transistor, thermistor (temperature) sensor, relay, compressor power supply start-stop control circuit and temperature controller D.C. regulated power supply that transformer and Resistor-Capacitor Unit etc. are formed, said elements and circuit bank are dressed up box and are placed outside the case.

" refrigerator electron lengthen the life electricity-saving appliance " announced in Patent Office of the People's Republic of China on June 15th, 1988 (CN87209788.9) in; the device that can manually adjust oven temperature, outside case a kind of and the complementary compatibility of common mechanical formula freezer temperature control device is disclosed; its formation is by a silicon controlled conducting or by the pressure-controlled that discharges and recharges that is subjected to potentiometer capacitor and unijunction transistor built-up circuit; the silicon controlled conducting makes the actuating of relay of series connection with it in same circuit make the closing of contact; the refrigerator power supply; and the potentiometer of two hand adjustment resistances makes the time that discharges and recharges change within the specific limits; under refrigeration needs, can shorten and prolong the start of compressor separately and reach the power-saving life-prolonging purpose downtime; available under special circumstances reset switch; transfer the former temperature controller control of refrigerator operation to; the time range that its weak point is startup-shutdown is all regulated control and convenient not to the utmost and rationally by the user, wherein is subjected to room temperature influence can adjust this technical characterictic automatically specifically not openly among a small circle for the positive-negative coefficient thermo-sensitive resistor of connect with potentiometer.

Thereby being to avoid above-mentioned the deficiencies in the prior art part, the purpose of this utility model provide the integral control circuit of TEMP spare that a kind of employing is adapted at season or indoor temperature change generated in case round the clock and corresponding composition thereof to reach the refrigerator electron temperature controller of automatic adjusting scope downtime.

The purpose of this utility model can reach by following measure: by the single PN junction of reverse bias as TEMP spare D ₁With resistance R ₁And capacitor C ₁Be connected temperature controller power supply E _CTwo ends, R ₁With C ₁Junction and R ₁With D ₁The junction separately with ic chip ₁(CB555) 2 be connected IC with 7 pin with 6 pin ₁8 and 4 pin and 1 pin connect power supply and ground, constitute oscillating circuit with this, IC ₁3 pin to be frequency have the output of the successive pulse groups of definite exponential relationship to temperature at that time, realize room temperature sensing and temperature conversion frequently, with IC ₂(CD4040) integrated package is a main part, makes its 16 and 8 pin connect power supply and ground, makes its 10 pin and prime IC ₁3 pin join, constitute the counting frequency dividing circuit with this, 1 pin during counting is the low level output, IC ₂11 pin on have respectively: R ₂With C ₂The series connection power supply is with ic chip ₃The C that connects of 5 pin ₄, the R that is connected with ground ₃, as power supply or IC ₃5 pin output positive transition signal the time IC ₂11 pin be the reset signal input, realize correct counting zero-time, with IC ₃(CB556) one one of dual time base circuit integrated package is a main part, makes its 1 pin pass through R ₄With prime IC ₂1 pin link to each other, make its 2 and 6 pin be parallel with C ₅, D ₃And K _1-2, make J in parallel and D between its 5 pin and the power supply ₄And LED ₂And R ₁₃The series connection part makes W ₁And R ₆Or R ₇Be connected across IC ₃1 pin and C ₅On, constitute relay switch control circuit, IC with this ₂The high level of output passes through D ₂To C ₅Charging makes IC ₃5 pin output low levels, J _KClosed refrigerator operation, C simultaneously ₅Pass through R ₆Or R ₇And W ₁To IC ₃1 pin extremely delay and be discharged into low level, make IC ₃5 pin be high level output, J _KDisconnect, refrigerator is stopped transport, at this moment IC ₂Also obtain reset signal and begin counting, counting finishes back IC ₂1 pin still be the high level output, in sum, the gate time scope is scope downtime, and with room temperature approximate reverse ratio; High level time is the available machine time scope, with C ₅Discharge time is relevant.With IC ₃(CB556) another one of dual time base circuit integrated package is a main part, makes its 8 resistance R of connecting with the emitter-base bandgap grading of BG with 12 pin ₁₂With R ₁₁After joining again with R ₁₀With C ₈Part in parallel connect back ground connection, make W ₂With C ₉After the parallel connection again with D ₅And B ₂Secondary coil series connection part connect again, constitute the protection switch circuit with this, when electric current is excessive in the compressor circuit in service, B ₂Voltage increases BG conducting C ₈The voltage rise height that powers on, IC ₃9 pin become low level, C ₅Pass through D ₃To IC ₃9 pin extremely discharge for low level J _KThe protection of disconnection refrigerator, another termination of Y one termination power IC ₃9 pin, this moment, the conducting sounding realized that protection reports to the police.Described reset switch K _1-2The position on the position of " 1 ", K ₂Can be on the position of " 1 " or " 2 ".

Embodiment is described in further detail below in conjunction with (accompanying drawing):

The accompanying drawing map title: refrigerator electron temperature controller electrical schematic diagram.

D ₁Be the cb knot of 3AX31, the PN junction in also optional other middle low power germanium and silicon triode or the diode works in reverse biased state R ₁Resistance is 10K ohm, C ₁For charging and discharging electric capacity, the appearance value is chosen D in 0.1-1 microfarad scope ₁Connect R ₁And R ₁Connect C ₁The back is across power supply E _CPositive pole and two ends, ground, R ₁Two ends respectively with IC ₁7 pin and 2 pin, 6 pin join IC ₁8 pin, 4 pin connect power supply and 1 pin ground connection and 5 pin and pass through C ₂Ground connection constitutes oscillating circuit with this, IC ₁Be CB555 type time base circuit integrated package.D ₁Reversing the current be:

I _R=I _R(T _O=25 ℃) exp ［ K(T-T _O), I in the formula _R(T _O=25 ℃) PN junction reversing the current when being 25 ℃, T is an ambient temperature, and K is the temperature coefficient of reversing the current, and the germanium PN junction is 0.08/ ℃, and the silicon PN junction is 0.12/ ℃, from IC ₁The pulse period of output is (C ₁E _C/ 3I _R+ 0.7R ₁C ₁), press index law with the room temperature rising and reduce.IC ₂(CD4040) be 12 grades of binary counter integrated packages, its 10 pin and prime IC ₃3 pin link to each other, its 16 pin connects power supply, its 8 pin ground connection constitutes the counting frequency dividing circuit with this.Before full 2048 pulses of its meter, its 1 pin is a low level, because IC ₂1 pin pass through R ₄With the IC of subordinate ₃1 pin join, and also by diode D ₂And potentiometer W ₁And R ₆(or R ₇) with the capacitor C of an end ground connection ₅Link to each other, so C ₅Last voltage is in low level state, with C ₅The IC that connects ₃2 pin, 6 pin also be low level, IC ₃Be dual time base circuit integrated package (CB556), its 4 pin, 14 pin, 10 pin connect power supply, and its 3 pin, 11 pin pass through capacitor C ₆, C ₇Ground connection and its 7 pin ground connection, IC ₃Its 5 pin is a high level when its 2 pin, 6 pin are low level, because 5 pin connect power supply by relay coil J, J discharges, and makes the relay contact J of string in refrigerator supply line _KDisconnect, compressor is stopped transport, and as seen downtime, t(stopped)=2048(C ₁E _C/ 3I _R+ 0.7R ₁C ₁), press index law with the room temperature rising and reduce, choose C ₁, R ₁Can obtain refrigerator requirement downtime at ambient temperature, present embodiment is in the time of 1 ℃-32 ℃, and be 150 minutes-14 minutes downtime, at IC ₂Full 2048 pulses of meter, its 1 pin output high level passes through R ₄And D ₂To C ₅Quick charge and C ₅Last voltage reaches (2/3) E immediately _C, IC ₃5 pin turn over and be low level, J adhesive, J _KConnect compressor start operation, C simultaneously ₅Can pass through R ₆(or R ₇), W ₁And IC ₃The slowly discharge of 1 pin to ground, work as C ₅Last voltage drop is (1/3) E _CThe time, IC ₃5 pin turn over again and be high level, refrigerator is shut down, the start operation work period finishes, this moment, the high level positive transition signal of 5 pin passed through C ₄Input IC ₂11 pin to IC ₂Zero clearing, next period shut-down time begins counting.Above-mentioned refrigerator available machine time scope is C ₅Last voltage is by (2/3) E _CBe discharged to (1/3) E _CRequired time equals 0.7(R ₆+ W ₂) C ₅Or 0.7(R ₇+ W ₁) C ₅, W ₁In order to finely tune running time, place furnishing in the machine to adapt to dissimilar refrigerator needs.Present embodiment is elected 10 minutes as and 8 minutes running time, and satisfying refrigerating chamber is that a star and the warm workspace of ice are required, by K switch ₂Conversion.Double-point double-throw switch K ₁One cutter passes through R ₅And LED ₁Ground connection, its cutter can connect to position set or " 2 ", promptly are used for the conversion of " external control " or " internal control " two condition.Under external control, the former temperature controller of refrigerator is in " connection " state, LED ₁It is luminous to glimmer, and its flash speed can reflect the height of room temperature.Under internal control, power supply passes through R ₈To C ₅Charging, as above-mentioned refrigerator start and by former temperature controller control, power supply passes through K ₁And R ₅And LED ₁Ground connection LED ₁Luminous continuously.LED ₂Be used to represent refrigerator power supply to connect and luminous.When refrigerator generation momentary power failure in service, E under internal control _CNeed pass through R ₈To C ₅Charging and warp (1.1R ₈C ₅) just cause J after the time _KConnect, under external control, E _CThe positive transition signal to pass through R ₂, C ₃Make IC ₂Zero clearing just makes C behind the full number of meter ₅Charging can realize the momentary power failure defencive function thus.If because when compressor current is risen, owing to B ₂Primary coil is to be serially connected in the refrigerator power supply circuits B ₂Secondary voltage increases, BG conducting, C ₈By quick charge to (2/3) E _C(present embodiment can be designed to 5 seconds), IC ₃9 pin be low level, D ₃Conducting, C ₅Pass through D ₃And IC ₃9 pin extremely discharge, 5 pin are high level, J _KDisconnect, compressor is protected, and buzzer Y is because of a termination E simultaneously _COne termination IC ₃The low level end of 9 pin so sounding alarm, its phonation time scope is by time constant R ₁₀C ₈Decision, at this moment between in, the user can give processing on hearing the news, otherwise C ₅Can start voluntarily after the charging.Button switch AN is in normally open, if the user will observe refrigerator starting situation when stopped status, can press AN, and power supply passes through R ₉To C ₅Quick charge, compressor start.Transformer B ₁And diode D ₅-D ₈Three-terminal voltage-stabilizing integrated package 7812 and relevant electric capacity constitute D.C. regulated power supply, output E _C=12V voltage, as the utility model circuit work power, refrigerator power line socket T, B ₂The contact switch J of primary coil and relay J _KSerial connection civil power 220V makes refrigerator supply of electric power circuit.

The utility model has anti-partially PN junction sensing reversing the current and the room temperature relation of adopting compared to existing technology; be aided with integrated circuit; can change from the motion tracking room temperature and adjust voluntarily this advantage of means for refrigerator when stopping working time range; cooperate two grades of RC to discharge and recharge available machine time scope adjustment in addition; be enough to satisfy the freezer temperature control needs, the user uses more convenient more reliable more reasonable.

Claims

1, a kind of refrigerator electron temperature controller, comprise the charge-discharge circuit of resistor-capacitor unit composition and the circuit and the confession temperature controller D.C. regulated power supply of gate-controlled switch spare control freezer compressor start-stop, wherein the operation of the outer power supply of temperature controller power supply and refrigerator is powered all and is connect civilian 220V alternating current, string has a relay switch contacts in the refrigerator supply line, the contact opens and closes the break-make of decision refrigerator power supply, the variable resistance of magnitude of voltage of exporting in the charge-discharge circuit and potentiometer determines the logical of gate-controlled switch spare or ends and time range, also set up reset switch and can transfer the former temperature controller control of refrigerator operation to, said elements and circuit bank are dressed up a box body, place case outer by user's adjustment, the utility model is characterised in that:

(a) by the single PN junction of reverse bias as TEMP spare D ₁With resistance R ₁And capacitor C ₁Be connected temperature controller power supply E _cTwo ends, R ₁With C ₁Junction and R ₁With D ₁The junction separately with ic chip ₁(CB555) 2 be connected IC with 7 pin with 6 pin ₁8 and 4 pin and 1 pin connect power supply and ground, constitute oscillating circuit with this, IC ₁3 pin to be frequency have the output of the successive pulse groups of definite exponential relationship to temperature at that time;

(b) with IC ₂(CD4040) integrated package is a main part, makes its 16 and 8 pin connect power supply and ground, makes its 10 pin and prime IC ₁3 pin join, constitute the counting frequency dividing circuit with this, 1 pin during counting is the low level output, IC ₂11 pin on have respectively: R ₂With C ₂The series connection power supply is with ic chip ₃5 pin connect C ₄, the R that is connected with ground ₃, as power supply or IC ₃5 pin output positive transition signal the time IC ₂11 pin be the reset signal input;

(c) with IC ₃(CB556) one one of dual time base circuit integrated package is a main part, makes its 1 pin pass through R ₄With prime IC ₂1 pin link to each other, make its 2 and 6 pin be parallel with C ₅, D ₃And K _1-2, make J in parallel and D between its 5 pin and the power supply ₄And LED ₂And R ₁₃The series connection part makes W ₁And R ₆Or R ₇Be connected across IC ₃1 pin and C ₅On, constitute relay switch control circuit, IC with this ₂The high level of output passes through D ₂To C ₅Charging makes IC ₃5 pin output low levels, J _kClosed refrigerator operation, C simultaneously ₅Pass through R ₆Or R ₇And W ₁To IC ₃1 pin extremely delay and be discharged into low level, make IC ₃5 pin be high level output, J _kDisconnect, refrigerator is stopped transport, at this moment IC ₂Also obtain reset signal and begin counting, counting finishes back IC ₂1 pin still be the high level output;

(d) with IC ₃(CB556) another one of dual time base circuit integrated package is a main part, makes its 8 resistance R of connecting with the emitter-base bandgap grading of BG with 12 pin ₁₂With R ₁₁After joining again with R ₁₀With C ₈Part in parallel connect back ground connection, make W ₂With C ₉After the parallel connection again with D ₅And B ₂Secondary coil series connection part connect again, constitute the protection switch circuit with this, when electric current is excessive in the compressor circuit in service, B ₂Voltage increases BG conducting C ₈The voltage rise height that powers on, IC ₃9 pin become low level, C ₅Pass through D ₃To IC ₃9 pin extremely discharge for low level J _kThe protection of disconnection refrigerator, another termination of Y one termination power IC ₃9 pin, this moment the conducting sounding.

2, according to the described a kind of refrigerator electronic temperature control device of claim 1, it is characterized in that described reset switch K _1-2The position on the position of " 1 ", K ₂Can be on the position of " 1 " or " 2 ".