CN204719559U - Two temperature control circuit - Google Patents

Two temperature control circuit Download PDF

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Publication number
CN204719559U
CN204719559U CN201520235068.8U CN201520235068U CN204719559U CN 204719559 U CN204719559 U CN 204719559U CN 201520235068 U CN201520235068 U CN 201520235068U CN 204719559 U CN204719559 U CN 204719559U
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China
Prior art keywords
relay
voltage comparator
voltage
temperature
circuit
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CN201520235068.8U
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Chinese (zh)
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李秋红
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李秋红
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Abstract

The utility model discloses a kind of two temperature control circuit, it comprises heat control unit, lower limit temperature control module and ceiling temperature control module.The well heater of heat control unit is controlled by bidirectional thyristor and photo-coupler, one amplifying circuit provides drive current for photo-coupler, this amplifying circuit is another in parallel with the 3rd relay, both are common through normally opened contact J1-1 and normally closed contact J2-1 ground connection, and the normally opened contact J3-1 of the 3rd relay is in parallel with normally opened contact J1-1; Lower limit temperature control module comprises the first temperature sensor LM35D, voltage comparator ic 1, potentiometer RP1 and the first relay, and voltage comparator ic 1 is by controlling the first relay J 1 duty to the voltage-contrast received; Ceiling temperature control module comprises the second temperature sensor LM35D, voltage comparator ic 2, potentiometer RP2 and the second relay, and voltage comparator ic 2 is by controlling the second relay duty to the voltage-contrast received.It reduces the switching frequency of well heater, improve stability and the life-span of system cloud gray model, and minimizing optimizes electromagnetic environment to the impact of electrical network, significant in domain of control temperature.

Description

Two temperature control circuit

Technical field

The utility model relates to a kind of control circuit, particularly relates to a kind of two temperature control circuit that temperature can be maintained in a pre-set interval.

Background technology

Temperature controls to be that the one often used in scientific experiment and production practices controls.Common one controls thinking, utilize voltage comparator, select the temperature sensor be suitable for, a road input using its voltage signal exported as comparer, the input of another road is obtained an applicable set potential, when the temperature varies, the output voltage of sensor changes thereupon, voltage comparator is by comparing the size of two groups of input voltages and the output determined is noble potential or electronegative potential, carry out the on off state of control heater according to this, reach the object of control temperature.Although this temperature control mode can realize the heating requirements being tending towards constant temperature, its shortcoming is the frequent opening and closing of well heater, does not singly reduce system lifetim and reliability, also pollutes electromagnetic environment.

And in most scientific experiment and production practices, the target temperature realized is needed to there is no strict constant temperature requirement, only need temperature to control in an appropriate scope, aforesaid temperature-control circuit controls temperature numerically a certain, and temperature cannot be realized to control the technical requirement in pre-set interval.Temperature-control circuit as a kind of in development and Design, after presetting, temperature can control in the interval of a requirement by it, thus the switching frequency of well heater can be reduced, improve stability and the life-span of system cloud gray model, and can reduce electromagnetic environment is optimized to the impact of electrical network, significant in domain of control temperature.

Utility model content

The purpose of this utility model is to provide a kind of reasonable in design, with low cost, stable, temperature can be controlled within the scope of a pre-set interval as required, thus can reduce the two temperature control circuit of the switching frequency of well heater.

For realizing above-mentioned technical purpose, the utility model adopts following technical scheme:

A kind of two temperature control circuit, it comprises:

Heat control unit, it is provided with the bidirectional thyristor of well heater and control heater on off state, and a photo-coupler is connected with bidirectional thyristor, for providing trigger current for bidirectional thyristor; Photo-coupler and triode T1 and biasing resistor form an amplifying circuit, amplifying circuit provides drive current by launching very photo-coupler, this amplifying circuit is another in parallel with the 3rd relay, both the normally opened contact J1-1 of the first relay jointly through being arranged in series and normally closed contact J2-1 ground connection of the second relay, the normally opened contact J3-1 of the 3rd relay is in parallel with normally opened contact J1-1;

Lower limit temperature control module, it comprises the first temperature sensor LM35D, the voltage signal output end of the first temperature sensor LM35D is connected with the inverting input of a voltage comparator ic 1, and the in-phase input end of voltage comparator ic 1 provides a reference voltage by a potentiometer RP1, the output terminal of voltage comparator ic 1 is connected with a triode T2 base stage, both form on-off circuits, triode ON when voltage comparator ic 1 exports noble potential, and the load of this on-off circuit is the first relay J 1;

Ceiling temperature control module, it comprises the second temperature sensor LM35D, the voltage signal output end of the second temperature sensor LM35D is connected with the in-phase input end of a voltage comparator ic 2, and the inverting input of voltage comparator ic 2 provides a reference voltage by a potentiometer RP2, the output terminal of voltage comparator ic 2 is connected with a triode T3 base stage, both form on-off circuits, and triode ON when voltage comparator ic 2 exports noble potential, the load of this on-off circuit is the second relay J 2.

In the utility model, due to the temperature of the first temperature sensor LM35D and the second temperature sensor LM35D present position and output voltage signal all linearly, therefore RP1 can be utilized to set lower limit temperature t1 at lower limit temperature control module, and RP2 capping temperature t2 can be utilized at ceiling temperature control module, during practical application, the first temperature sensor LM35D and the second temperature sensor LM35D is placed in same position.

When in this environment during temperature < t1, voltage comparator ic 1 exports noble potential, make the first relay J 1 conducting, and voltage comparator ic 2 exports electronegative potential, makes the second relay J 2 still be in power failure state; Therefore in the circuit of heat control unit, normally opened contact J1-1 closes, normally closed contact J2-1 closes, and whole circuit forms path, and well heater is in running order; Meanwhile, because the 3rd relay J 3 place circuit forms path, its conducting and normally opened contact J3-1 is closed.

When temperature rise to > t1 but < t2 time, voltage comparator ic 1 exports electronegative potential, make the first relay J 1 become power failure state, voltage comparator ic 2 exports electronegative potential, makes the second relay J 2 still be in power failure state; Therefore in the circuit of heat control unit, normally opened contact J1-1 disconnects, normally closed contact J2-1 closes, but the 3rd relay J 3 is in conducting state, normally opened contact J3-1 is closed, and the whole circuit of heat control unit is still in channel status, and well heater works on.

When temperature rises to > t2, voltage comparator ic 2 exports noble potential, makes the second relay J 2 be in conducting state; Therefore in the circuit of heat control unit, normally closed contact J2-1 disconnects, and the circuit of heat control unit is in off state, well heater quits work, and temperature tops out, and meanwhile, because the 3rd relay J 3 becomes power failure state, normally opened contact J3-1 is disconnected.

When temperature drop to < t2 but > t1 time, voltage comparator ic 1 exports electronegative potential, make the first relay J 1 power failure state not yet, and the 3rd relay J 3 still maintains power failure state; Therefore in the circuit of heat control unit, normally opened contact J1 1 disconnects, normally opened contact J3-1 disconnects, and well heater still quits work, and temperature continues to reduce.

When temperature drops to < t1, voltage comparator ic 1 exports noble potential, make the first relay J 1 conducting, and voltage comparator ic 2 exports electronegative potential, makes the second relay J 2 still be in power failure state; In the circuit of heat control unit, normally opened contact J1-1 closes, and normally closed contact J2-1 closes, whole circuit forms path, and well heater enters duty again, and temperature raises, because the 3rd relay J 3 place circuit forms path, its conducting and normally opened contact J3-1 is closed.

As can be seen here, after the temperature of this control circui being preset in the interval of t1-t2, by the control to well heater, make actual temperature reciprocal be increased to t2 by t1, be then reduced to t1 by t2, temperature maintained in pre-set interval all the time.

The utility model has following beneficial effect: temperature can control in an interval according to presetting by it, the requirement to temperature conditions in many scientific experiments and production practices can be met, reduce again the switching frequency of well heater, improve stability and the life-span of system cloud gray model, and minimizing optimizes electromagnetic environment to the impact of electrical network, significant in domain of control temperature.In addition, its circuit is simple, with low cost, easily realizes.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of heat control unit.

Fig. 2 is the circuit diagram of lower limit temperature control module.

Fig. 3 is the circuit diagram of ceiling temperature control module.

Embodiment

A kind of two temperature control circuit disclosed in the utility model, it is made up of heat control unit, lower limit temperature control module and ceiling temperature control module three part.

As shown in Figure 1, described heat control unit is provided with a well heater, the operating circuit of well heater is connected with bidirectional thyristor JZ, and bidirectional thyristor JZ is used for the switch working state of control heater; One photo-coupler Rcds is connected with bidirectional thyristor JZ, and photo-coupler Rcds is used for providing trigger current for bidirectional thyristor JZ; Described photo-coupler Rcds and triode T1 and biasing resistor R3, biasing resistor R4 form an amplifying circuit, this amplifying circuit provides drive current by the luminotron launching very photo-coupler Rcds, this amplifying circuit is another in parallel with the 3rd relay J 3, both the normally opened contact J1-1 of the first relay J 1 jointly through being arranged in series and normally closed contact J2-1 ground connection of the second relay J 2, the normally opened contact J3-1 of the 3rd relay J 3 is in parallel with normally opened contact J1-1.In foregoing circuit, when normally closed contact J2-1 closes, normally opened contact J3-1 and normally opened contact J1-1 at least one closed time, heat control unit can enter duty, i.e. the operating circuit formation loop and enter heated condition of well heater.

As shown in Figure 2, described lower limit temperature control module comprises the first temperature sensor LM35D in cut-in operation circuit, the voltage signal output end of the first temperature sensor LM35D is connected with the inverting input of a voltage comparator ic 1, and the in-phase input end of voltage comparator ic 1 is connected with the armature contact A1 of a potentiometer RP1, after potentiometer RP1 connects power supply, it can be voltage comparator ic 1 and provides a reference voltage, and this reference voltage is adjustable; The output terminal of voltage comparator ic 1 is connected with a triode T2 base stage, both form an on-off circuit, and between the first relay J 1 collector of being connected to triode T2 as the load of this on-off circuit and power supply, when voltage comparator ic 1 exports noble potential, triode T2 conducting, the first relay J 1 conducting.

As shown in Figure 3, described ceiling temperature control module comprises the second temperature sensor LM35D in cut-in operation circuit, the voltage signal output end of the second temperature sensor LM35D is connected with the in-phase input end of a voltage comparator ic 2, and the inverting input of voltage comparator ic 2 is connected with the armature contact A2 of a potentiometer RP2, after potentiometer RP2 connects power supply, it can be voltage comparator ic 2 and provides a reference voltage, and this reference voltage is adjustable; The output terminal of voltage comparator ic 2 is connected with a triode T3 base stage, both form an on-off circuit, and between the second relay J 2 collector of being connected to triode T3 as the load of this on-off circuit and power supply, when voltage comparator ic 2 exports noble potential, triode T3 conducting, the second relay J 2 conducting.

Embodiment: be described in 50 DEG C of-60 DEG C of intervals to utilize this control circui temperature.

Due to the first temperature sensor LM35D and the second temperature sensor LM35D, for existing temperature sensor product, the temperature of its present position and the voltage signal of output are all linearly, temperature often raises 1 DEG C, its output voltage raises 10 millivolts, potentiometer RP1 is adjusted in lower limit temperature control module, the voltage-to-ground of armature contact A1 is made to equal 500 millivolts, potentiometer RP2 is adjusted in ceiling temperature control module, the voltage-to-ground of armature contact A2 is made to equal 600 millivolts, first temperature sensor LM35D and the second temperature sensor LM35D is placed in by the same position of heating part, the workflow of this circuit is:

1, temperature-rise period.

1.1 when temperature is less than 50 DEG C.

The voltage signal that first temperature sensor LM35D exports is less than the in-phase input end voltage of voltage comparator ic 1, and the output terminal B1 of voltage comparator ic 1 is in noble potential, the first relay J 1 conducting; The voltage signal that second temperature sensor LM35D exports is less than the anti-phase input terminal voltage of voltage comparator ic 2, and the output terminal B2 of voltage comparator ic 2 is in electronegative potential, and the second relay J 2 is in power failure state; The state of the first relay J 1, second relay J 2 makes that the normally opened contact J1-1 in heat control unit is closed, normally closed contact J2-1 still closes, then the 3rd relay J 3 conducting is made, normally opened contact J3-1 closes, triode T1 conducting, light the luminotron of photoelectrical coupler Rcds, trigger bidirectional thyristor JZ, make well heater work, and keep this state until temperature is less than 60 DEG C.

1.2 work as temperature is greater than 50 DEG C, when being less than 60 DEG C.

When temperature equals 50 DEG C, the voltage signal that first temperature sensor LM35D exports is equal with the in-phase input end voltage of voltage comparator ic 1, voltage comparator ic 1 is in critical conditions, as long as temperature is a bit larger tham 50 DEG C, its anti-phase input terminal potential is higher than in-phase input end current potential, the output terminal B1 place of voltage comparator ic 1 presents electronegative potential, first relay J 1 becomes power failure state, although the normally opened contact J1-1 in heat control unit can be made to become off-state, but because of constant with the normally opened contact J3-1 state of its parallel connection, 3rd relay J 3 still conducting, well heater still works, continue up to temperature and be less than 60 DEG C.

1.3 when temperature is greater than 60 DEG C.

When temperature equals 60 DEG C, the voltage signal that second temperature sensor LM35D exports is equal with the anti-phase input terminal voltage of voltage comparator ic 2, voltage comparator ic 2 is in critical conditions, as long as temperature is a bit larger tham 60 DEG C, its in-phase input end current potential is higher than anti-phase input terminal potential, voltage comparator ic 2 output terminal B2 place presents noble potential, second relay J 2 conducting, the normally closed contact J2-1 in heat control unit is made to be in off-state, then the 3rd relay J 3 dead electricity, normally opened contact J3-1 is off-state, the luminotron of photoelectrical coupler Rcds extinguishes, bidirectional thyristor JZ is closed, well heater quits work.

2, temperature-fall period.

When 2.1 temperature are greater than 60 DEG C.

When temperature is greater than 60 DEG C, the voltage signal that first temperature sensor LM35D exports is greater than the in-phase input end voltage of voltage comparator ic 1, the output terminal B1 of voltage comparator ic 1 is in electronegative potential, first relay J 1 is in power failure state, the voltage signal that second temperature sensor LM35D exports is greater than the anti-phase input terminal voltage of voltage comparator ic 2, the output terminal B2 of voltage comparator ic 2 is in noble potential, and the second relay J 2 is in conducting state; Thus making the normally opened contact J1-1 in heat control unit, normally closed contact J2-1 and normally opened contact J3-1 all be in off-state, triode T1 ends, and well heater does not work, and cooling continues.

2.2 temperature are less than 60 DEG C, when being greater than 50 DEG C.

The voltage signal that first temperature sensor LM35D exports is greater than the in-phase input end voltage of voltage comparator ic 1, the output terminal B1 of voltage comparator ic 1 is in electronegative potential, first relay J 1 is in power failure state, the voltage signal that second temperature sensor LM35D exports is less than the anti-phase input terminal voltage of voltage comparator ic 2, the output terminal B2 of voltage comparator ic 2 is in electronegative potential, and the second relay J 2 is in power failure state; Thus making the normally opened contact J1-1 in heat control unit and normally opened contact J3-1 be in off-state, normally closed contact J2-1 closes, and triode T1 ends, and well heater does not work, and cooling continues.

When 2.3 temperature are less than 50 DEG C.

The voltage signal that first temperature sensor LM35D exports is less than the in-phase input end voltage of voltage comparator ic 1, and the output terminal B1 of voltage comparator ic 1 is in noble potential, the first relay J 1 conducting; The voltage signal that second temperature sensor LM35D exports is less than the anti-phase input terminal voltage of voltage comparator ic 2, and the output terminal B2 of voltage comparator ic 2 is in electronegative potential, and the second relay J 2 is in power failure state; The state of the first relay J 1, second relay J 2 makes that the normally opened contact J1-1 in heat control unit is closed, normally closed contact J2-1 still closes, then the 3rd relay J 3 conducting is made, normally opened contact J3-1 closes, triode T1 conducting, light the luminotron of photoelectrical coupler Rcds, trigger bidirectional thyristor JZ, make well heater again enter duty.

As implied above, this circuit by control to well heater, make actual temperature reciprocal be increased to 60 DEG C by 50 DEG C, be then reduced to 50 DEG C by 60 DEG C, temperature maintained in 50 DEG C of default-60 DEG C of intervals all the time.

Claims (1)

1. a two temperature control circuit, is characterized in that, it comprises:
Heat control unit, it is provided with the bidirectional thyristor of well heater and control heater on off state, and a photo-coupler is connected with bidirectional thyristor, for providing trigger current for bidirectional thyristor; Photo-coupler and triode T1 and biasing resistor form an amplifying circuit, amplifying circuit provides drive current by launching very photo-coupler, this amplifying circuit is another in parallel with the 3rd relay, both the normally opened contact J1-1 of the first relay jointly through being arranged in series and normally closed contact J2-1 ground connection of the second relay, the normally opened contact J3-1 of the 3rd relay is in parallel with normally opened contact J1-1;
Lower limit temperature control module, it comprises the first temperature sensor LM35D, the voltage signal output end of the first temperature sensor LM35D is connected with the inverting input of a voltage comparator ic 1, and the in-phase input end of voltage comparator ic 1 provides a reference voltage by a potentiometer RP1, the output terminal of voltage comparator ic 1 is connected with a triode T2 base stage, both form on-off circuits, triode ON when voltage comparator ic 1 exports noble potential, and the load of this on-off circuit is the first relay J 1;
Ceiling temperature control module, it comprises the second temperature sensor LM35D, the voltage signal output end of the second temperature sensor LM35D is connected with the in-phase input end of a voltage comparator ic 2, and the inverting input of voltage comparator ic 2 provides a reference voltage by a potentiometer RP2, the output terminal of voltage comparator ic 2 is connected with a triode T3 base stage, both form on-off circuits, and triode ON when voltage comparator ic 2 exports noble potential, the load of this on-off circuit is the second relay J 2.
CN201520235068.8U 2015-04-13 2015-04-13 Two temperature control circuit CN204719559U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104834334A (en) * 2015-04-13 2015-08-12 李秋红 Double temperature control circuit
CN106444900A (en) * 2016-12-01 2017-02-22 重庆依凯科技有限公司 Upper temperature limit and lower temperature limit control circuit applied to temperature control circuit
CN107120816A (en) * 2017-04-25 2017-09-01 北京中科卓尔生物科技有限公司 A kind of natto temperature and humidity control system
CN107678290A (en) * 2017-10-31 2018-02-09 陈翟 A kind of smart home constant temperature section control circuit system
CN108758789A (en) * 2018-07-02 2018-11-06 毛琦 A kind of intelligent energy-saving device for central heating

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104834334A (en) * 2015-04-13 2015-08-12 李秋红 Double temperature control circuit
CN106444900A (en) * 2016-12-01 2017-02-22 重庆依凯科技有限公司 Upper temperature limit and lower temperature limit control circuit applied to temperature control circuit
CN107120816A (en) * 2017-04-25 2017-09-01 北京中科卓尔生物科技有限公司 A kind of natto temperature and humidity control system
CN107678290A (en) * 2017-10-31 2018-02-09 陈翟 A kind of smart home constant temperature section control circuit system
CN107678290B (en) * 2017-10-31 2020-12-08 王锐 Intelligence house constant temperature interval control circuit system
CN108758789A (en) * 2018-07-02 2018-11-06 毛琦 A kind of intelligent energy-saving device for central heating

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151021

Termination date: 20170413

CF01 Termination of patent right due to non-payment of annual fee