CN103853213A - Constant-temperature circuit - Google Patents
Constant-temperature circuit Download PDFInfo
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- CN103853213A CN103853213A CN201210500673.4A CN201210500673A CN103853213A CN 103853213 A CN103853213 A CN 103853213A CN 201210500673 A CN201210500673 A CN 201210500673A CN 103853213 A CN103853213 A CN 103853213A
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- circuit
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Abstract
The embodiment of the invention discloses a constant-temperature circuit which includes a temperature measurement circuit used for detecting temperatures and outputting different electrical signals according to the different temperatures; a control circuit used for receiving the electrical signals output by the temperature measurement circuit and controlling the on-off of the switching circuit; and the switching circuit used for controlling the work state of an external heater. Through adoption of the constant-temperature circuit, automatic control of the work state of the external heater can be realized according to detected temperatures so that temperature automatic control can be realized without manual operations; and the constant-temperature circuit is sensitive in response and accurate in temperature adjustment and control.
Description
Technical field
The present invention relates to circuit field, relate in particular to a kind of constant-temperature circuit.
Background technology
In existing lamp applications scene, sometimes need to keep peripheral temperature in temperature constant state.In the time that temperature reduces, need to improve temperature, in the time that temperature raises, need to close the work of well heater.In prior art, conventionally need manual operation, complete temperature control, complex operation.
Summary of the invention
Embodiment of the present invention technical matters to be solved is, a kind of constant-temperature circuit is provided.Can realize the automatic control to external heater duty according to the temperature detecting, and then realize the automatic control to temperature, without manual operation, be quick on the draw, temperature adjusting is accurate.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of constant-temperature circuit, comprising:
Temperature measurement circuit, control circuit and on-off circuit;
Described temperature measurement circuit, for detection of temperature, is exported different electric signal according to different temperature;
Described control circuit, for receiving the electric signal of described temperature measurement circuit output, is controlled the break-make of described on-off circuit;
Described on-off circuit is for controlling the duty of external heater.
Wherein, described control circuit comprises: the first transistor, transistor seconds, the first divider resistance, the second divider resistance and the 3rd divider resistance;
The collector of described the first transistor is connected with one end of described the second divider resistance by described the first divider resistance, the collector of transistor seconds described in described another termination of the second divider resistance, described the first transistor emitter is connected with one end of described the 3rd divider resistance with the common node of transistor seconds emitter, and the other end of described the 3rd divider resistance connects respectively the base stage of described the first transistor and the base stage of transistor seconds.
Wherein, described temperature measurement circuit comprises: thermistor, the 4th divider resistance, the 5th divider resistance and adjustable resistance;
Described thermistor is connected between described the first divider resistance and the base stage of described the first transistor; Described the 4th divider resistance is connected between the base stage and described the 3rd divider resistance of described the first transistor; Described the 5th divider resistance is connected between the base stage and the 3rd divider resistance of described transistor seconds, and described adjustable resistance is connected in parallel on the series circuit of described thermistor and described the 4th divider resistance composition.
Wherein, described on-off circuit comprises: the 3rd transistor, the 4th transistor and relay;
Described the 3rd transistorized base stage connects the collector of described transistor seconds, and described the 3rd transistorized emitter connects the collector of described the first transistor, and described the 3rd transistorized collector connects described the 4th transistorized base stage; Described the 4th transistorized collector connects positive source by relay, and emitter connects power cathode.
Wherein, described on-off circuit also comprises switching diode, and the positive pole of described switching diode is connected with described the 3rd transistorized collector, and negative pole connects described the 4th transistorized base stage.
Wherein, described constant-temperature circuit also comprises filter capacitor, and described filter capacitor is connected between power positive cathode.
Wherein, described constant-temperature circuit also comprises protection diode, and the positive pole of described protection diode connects positive source, and negative pole connects the positive pole of described filter capacitor.
Wherein, described constant-temperature circuit also comprises the 6th divider resistance, and described the 6th divider resistance and described adjustable resistance are connected between power positive cathode after connecting.
Wherein, described constant-temperature circuit also comprises the 7th divider resistance, and described the 7th divider resistance is connected between described the 4th transistorized emitter and power cathode.
Wherein, described the first transistor, transistor seconds, the 4th transistor are NPN transistor, and described the 3rd transistor is PNP transistor.
Implement the embodiment of the present invention, there is following beneficial effect:
By temperature measurement circuit detected temperatures, when temperature is during lower than default ideal temperature, control circuit gauge tap circuit turn-on, the external heater heating of starting working, until reach default ideal temperature, the temperature output electrical signals now recording according to temperature measurement circuit is so that control circuit gauge tap circuit turn-offs, external heater stops heating, realize thus the automatic control to temperature, whole process is without manual operation, circuit simple in structure, cost is low, and form bridge for measuring temperature by multiple resistance, make circuit being quick on the draw to temperature variation, temperature adjusting is accurate.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the first embodiment of constant-temperature circuit of the present invention forms schematic diagram;
Fig. 2 is the second embodiment circuit diagram of circuit in constant temperature of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, for the first embodiment of constant-temperature circuit of the present invention forms schematic diagram; In the present embodiment, described constant-temperature circuit comprises: temperature measurement circuit 10, control circuit 20 and on-off circuit 30.
Described temperature measurement circuit 10, for detection of temperature, is exported different electric signal according to different temperature;
The electric signal that described control circuit 20 is exported for receiving described temperature measurement circuit 10, controls the break-make of described on-off circuit 30;
Described on-off circuit 30 is for controlling the duty of external heater.
By temperature measurement circuit detected temperatures, when temperature is during lower than default ideal temperature, control circuit gauge tap circuit turn-on, the external heater heating of starting working, until reach default ideal temperature, the temperature output electrical signals now recording according to temperature measurement circuit is so that control circuit gauge tap circuit turn-offs, external heater stops heating, has realized thus the automatic control to temperature, and whole process is without manual operation, circuit simple in structure, cost is low.
Please refer to Fig. 2, is the second embodiment circuit diagram of circuit in constant temperature of the present invention.In the present embodiment, described control circuit comprises: the first transistor VT1, transistor seconds VT2, the first divider resistance R1, the second divider resistance R2 and the 3rd divider resistance R3;
The collector of described the first transistor VT1 is connected with one end of described the second divider resistance R2 by described the first divider resistance R1, the collector of transistor seconds VT1 described in described second another termination of divider resistance R2, described the first transistor VT1 emitter is connected with one end of described the 3rd divider resistance R3 with the common node of transistor seconds VT2 emitter, and the other end of described the 3rd divider resistance R3 connects respectively the base stage of described the first transistor VT1 and the base stage of transistor seconds VT2.
Described temperature measurement circuit comprises: thermistor RT, the 4th divider resistance R4, the 5th divider resistance R5 and adjustable resistance RP;
Described thermistor RT is connected between described the first divider resistance R1 and the base stage of described the first transistor VT1; Described the 4th divider resistance R4 is connected between the base stage and described the 3rd divider resistance R3 of described the first transistor VT1; Described the 5th divider resistance R5 is connected between the base stage and the 3rd divider resistance R3 of described transistor seconds VT2, and described adjustable resistance RP is connected in parallel on the series circuit of described thermistor RT and described the 4th divider resistance R4 composition.
Described on-off circuit comprises: the 3rd transistor VT3, the 4th transistor VT4 and relay K;
The base stage of described the 3rd transistor VT3 connects the collector of described transistor seconds VT2, and the emitter of described the 3rd transistor VT3 connects the collector of described the first transistor VT1, and the collector of described the 3rd transistor VT3 connects the base stage of described the 4th transistor VT4; The collector of described the 4th transistor VT4 connects positive source by relay K, and emitter connects power cathode.
Described on-off circuit also comprises switching diode VD1, and the positive pole of described switching diode VD1 is connected with the collector of described the 3rd transistor VT3, and negative pole connects the base stage of described the 4th transistor VT4.
Described constant-temperature circuit also comprises filter capacitor C, and described filter capacitor C is connected between power positive cathode.
Described constant-temperature circuit also comprises protection diode VD2, and the positive pole of described protection diode VD2 connects positive source, and negative pole connects the positive pole of described filter capacitor C.
Described constant-temperature circuit also comprises the 6th divider resistance R6, after described the 6th divider resistance R6 and described adjustable resistance RP connect, is connected between power positive cathode.
Described constant-temperature circuit also comprises the 7th divider resistance R7, and described the 7th divider resistance R7 is connected between the emitter and power cathode of described the 4th transistor VT4.
Described the first transistor VT1, transistor seconds VT2, the 4th transistor VT4 are NPN transistor, and described the 3rd transistor VT3 is PNP transistor.
It should be noted that, although Fig. 2 shows concrete temperature measurement circuit, control circuit and on-off circuit, the present invention is not limited to this.Those skilled in the art are to be understood that, the present invention can also comprise the circuit structure that passes through thermometric and automatically control external heater work of other any appropriate, but, temperature measurement circuit, control circuit and on-off circuit are as shown in Figure 2 not only simple in structure, and thermometric is accurate, whole circuit to realize cost low.
The principle of work of constant-temperature circuit in the present embodiment is described below in conjunction with Fig. 2:
In this circuit, thermistor RT, the 4th divider resistance R4, the 5th divider resistance R5, adjustable resistance RP form bridge for measuring temperature.Thermistor RT is the main temperature element of circuit, and its resistance raises and reduces with temperature.Adjustable resistance RP sets for ideal temperature, under a certain ideal temperature, regulate adjustable resistance RP that it is equated with the thermistor RT resistance under this ideal temperature, now bridge for measuring temperature is in equilibrium state, and the base potential of the first transistor VT1, transistor seconds VT2 equates.Form differential amplifier circuit by components and parts such as the first transistor VT1, transistor seconds VT2, in the time of bridge for measuring temperature balance, the voltage difference of the collector of the first transistor VT1, transistor seconds VT2 be 0, the three transistor VT3, the 4th transistor VT4 all in cut-off state, not adhesive of relay K.
In the time that bridge for measuring temperature detects that temperature reduces, the resistance of thermistor RT raises, bridge for measuring temperature out of trim, and the base current of the first transistor VT1 reduces, the electric current of its collector is corresponding reducing also, collector voltage raises, and the collector potential of transistor seconds VT2 is constant, and the 3rd transistor VT2 is subject to forward bias and conducting, also conducting thereupon of the 4th transistor VT4, relay K adhesive, the power supply of connection external heater, external heater starts heating.Along with temperature recovery, the resistance of thermistor RT reduces gradually, in the time that thermistor RT equates with adjustable resistance RP resistance, bridge for measuring temperature rebalancing, the collector voltage of the first transistor VT1, transistor seconds VT2 is poor is that 0, the three transistor VT2, the 4th transistor VT4 recover again cut-off, relay K discharges, external heater stops heating, and said process constantly repeats along with temperature variation, makes temperature keep constant.
By the description of above-described embodiment, the present invention has the following advantages:
By temperature measurement circuit detected temperatures, when temperature is during lower than default ideal temperature, control circuit gauge tap circuit turn-on, the external heater heating of starting working, until reach default ideal temperature, the temperature output electrical signals now recording according to temperature measurement circuit is so that control circuit gauge tap circuit turn-offs, external heater stops heating, realize thus the automatic control to temperature, whole process is without manual operation, circuit simple in structure, cost is low, and form bridge for measuring temperature by multiple resistance, make circuit being quick on the draw to temperature variation, temperature adjusting is accurate.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, can carry out the hardware that instruction is relevant by computer program to complete, described program can be stored in a computer read/write memory medium, this program, in the time carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (10)
1. a constant-temperature circuit, is characterized in that, comprising: temperature measurement circuit, control circuit and on-off circuit;
Described temperature measurement circuit, for detection of temperature, is exported different electric signal according to different temperature;
Described control circuit, for receiving the electric signal of described temperature measurement circuit output, is controlled the break-make of described on-off circuit;
Described on-off circuit is for controlling the duty of external heater.
2. constant-temperature circuit as claimed in claim 1, is characterized in that, described control circuit comprises: the first transistor, transistor seconds, the first divider resistance, the second divider resistance and the 3rd divider resistance;
The collector of described the first transistor is connected with one end of described the second divider resistance by described the first divider resistance, the collector of transistor seconds described in described another termination of the second divider resistance, described the first transistor emitter is connected with one end of described the 3rd divider resistance with the common node of transistor seconds emitter, and the other end of described the 3rd divider resistance connects respectively the base stage of described the first transistor and the base stage of transistor seconds.
3. constant-temperature circuit as claimed in claim 2, is characterized in that, described temperature measurement circuit comprises: thermistor, the 4th divider resistance, the 5th divider resistance and adjustable resistance;
Described thermistor is connected between described the first divider resistance and the base stage of described the first transistor; Described the 4th divider resistance is connected between the base stage and described the 3rd divider resistance of described the first transistor; Described the 5th divider resistance is connected between the base stage and the 3rd divider resistance of described transistor seconds, and described adjustable resistance is connected in parallel on the series circuit of described thermistor and described the 4th divider resistance composition.
4. constant-temperature circuit as claimed in claim 3, is characterized in that, described on-off circuit comprises: the 3rd transistor, the 4th transistor and relay;
Described the 3rd transistorized base stage connects the collector of described transistor seconds, and described the 3rd transistorized emitter connects the collector of described the first transistor, and described the 3rd transistorized collector connects described the 4th transistorized base stage; Described the 4th transistorized collector connects positive source by relay, and emitter connects power cathode.
5. constant-temperature circuit as claimed in claim 4, is characterized in that, described on-off circuit also comprises switching diode, and the positive pole of described switching diode is connected with described the 3rd transistorized collector, and negative pole connects described the 4th transistorized base stage.
6. constant-temperature circuit as claimed in claim 5, is characterized in that, described constant-temperature circuit also comprises filter capacitor, and described filter capacitor is connected between power positive cathode.
7. constant-temperature circuit as claimed in claim 6, is characterized in that, described constant-temperature circuit also comprises protection diode, and the positive pole of described protection diode connects positive source, and negative pole connects the positive pole of described filter capacitor.
8. constant-temperature circuit as claimed in claim 7, is characterized in that, described constant-temperature circuit also comprises the 6th divider resistance, and described the 6th divider resistance and described adjustable resistance are connected between power positive cathode after connecting.
9. constant-temperature circuit as claimed in claim 8, is characterized in that, described constant-temperature circuit also comprises the 7th divider resistance, and described the 7th divider resistance is connected between described the 4th transistorized emitter and power cathode.
10. constant-temperature circuit as claimed in claim 9, is characterized in that, described the first transistor, transistor seconds, the 4th transistor are NPN transistor, and described the 3rd transistor is PNP transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210500673.4A CN103853213A (en) | 2012-11-30 | 2012-11-30 | Constant-temperature circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210500673.4A CN103853213A (en) | 2012-11-30 | 2012-11-30 | Constant-temperature circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103853213A true CN103853213A (en) | 2014-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210500673.4A Pending CN103853213A (en) | 2012-11-30 | 2012-11-30 | Constant-temperature circuit |
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| CN (1) | CN103853213A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797030A (en) * | 2015-04-29 | 2015-07-22 | 韦道义 | Automatic control microwave heater |
| CN112203370A (en) * | 2020-09-30 | 2021-01-08 | 安徽江淮汽车集团股份有限公司 | Intelligent heating circuit and system |
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| US3946198A (en) * | 1974-07-01 | 1976-03-23 | Ford Motor Company | Electrical control system for an exhaust gas sensor |
| US4210823A (en) * | 1978-05-15 | 1980-07-01 | Honeywell Inc. | Condition control system with special set point means |
| CN88200753U (en) * | 1988-01-15 | 1988-09-21 | 李德恒 | Safety electricity-saving thermostatic controller for electric heating blanket |
| CN87211907U (en) * | 1987-08-16 | 1988-10-05 | 全广明 | Constant temp. electrothermal blanket |
| CN2050748U (en) * | 1989-03-10 | 1990-01-10 | 邱学广 | Medical hot compress appliance |
| CN2094763U (en) * | 1991-07-19 | 1992-01-29 | 中国人民解放军第四三○九工厂 | Double-temp. double-control temp. controller |
| CN2147574Y (en) * | 1992-12-09 | 1993-11-24 | 郭建平 | Multi-function electric heating switch |
| CN2151491Y (en) * | 1993-03-04 | 1993-12-29 | 宗周弼 | Miniature temp. controller for living cell inspection |
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2012
- 2012-11-30 CN CN201210500673.4A patent/CN103853213A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946198A (en) * | 1974-07-01 | 1976-03-23 | Ford Motor Company | Electrical control system for an exhaust gas sensor |
| US4210823A (en) * | 1978-05-15 | 1980-07-01 | Honeywell Inc. | Condition control system with special set point means |
| CN87211907U (en) * | 1987-08-16 | 1988-10-05 | 全广明 | Constant temp. electrothermal blanket |
| CN88200753U (en) * | 1988-01-15 | 1988-09-21 | 李德恒 | Safety electricity-saving thermostatic controller for electric heating blanket |
| CN2050748U (en) * | 1989-03-10 | 1990-01-10 | 邱学广 | Medical hot compress appliance |
| CN2094763U (en) * | 1991-07-19 | 1992-01-29 | 中国人民解放军第四三○九工厂 | Double-temp. double-control temp. controller |
| CN2147574Y (en) * | 1992-12-09 | 1993-11-24 | 郭建平 | Multi-function electric heating switch |
| CN2151491Y (en) * | 1993-03-04 | 1993-12-29 | 宗周弼 | Miniature temp. controller for living cell inspection |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797030A (en) * | 2015-04-29 | 2015-07-22 | 韦道义 | Automatic control microwave heater |
| CN112203370A (en) * | 2020-09-30 | 2021-01-08 | 安徽江淮汽车集团股份有限公司 | Intelligent heating circuit and system |
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Application publication date: 20140611 |