CN202033126U - LED temperature monitoring and indicating circuit - Google Patents
LED temperature monitoring and indicating circuit Download PDFInfo
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- CN202033126U CN202033126U CN2011200192681U CN201120019268U CN202033126U CN 202033126 U CN202033126 U CN 202033126U CN 2011200192681 U CN2011200192681 U CN 2011200192681U CN 201120019268 U CN201120019268 U CN 201120019268U CN 202033126 U CN202033126 U CN 202033126U
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Abstract
The utility model discloses an LED temperature monitoring and indicating circuit, which comprises a temperature detecting sensor used for detecting LED temperature, a temperature variable sampling circuit used for converting the LED temperature detected by the temperature detecting sensor into an electric signal, a variable converting circuit used for converting the electric signal generated by the temperature variable sampling circuit into a driving signal of an indicating circuit, and the indicating circuit used for indicating an LED temperature state, wherein the temperature detecting sensor is connected with the temperature variable sampling circuit, the output end of the temperature variable sampling circuit is connected with the input end of the variable converting circuit, and the output end of the variable converting circuit is connected with the input end of the indicating circuit. When a to-be-detected LED temperature reaches a value within a certain range, the indicating circuit sends prompting information to a user, who carries out processing according to practical using condition, so the LED temperature monitoring and indicating circuit can realize visualized monitoring and indicating to the LED temperature state.
Description
Technical field
The utility model relates to the temperature monitoring technical field, relates in particular to a kind of LED temperature monitoring and indicating circuit.
Background technology
In the application process of New LED, radiating management and temperature control are maximum difficult points, and particularly great power LED is applied in the illumination.The LED temperature not only is related to the serviceable life of LED, also the light output with it is relevant, when environment temperature raises or working current increases when causing the LED temperature to raise, micro-parameters such as the electronics of the inner PN junction of LED, hole concentration can change, thereby influence the light output efficiency of LED.In addition, the rising of PN junction temperature also can cause the forward conduction voltage decreases of LED, this means that the temperature rise meeting of PN junction further raises the temperature of LED, in case the temperature of LED surpasses certain certain value, will damage whole LED when serious.So temperature monitoring and control to LED seem particularly important.
In the prior art; the LED illumination is used and is provided with the LED thermal-shutdown circuit usually; when the temperature of LED exceeds a certain scope; the LED thermal-shutdown circuit by automatic cut-out LED driving power or reduce drive current; so that the temperature of LED returns to normal range; but there is drawback in this automatic mode; in some occasion; this LED thermal-shutdown circuit may cause serious consequence; for example in LED such as mine illumination is used; if the LED thermal-shutdown circuit cuts off LED automatically or reduces luminous intensity, will cause serious threat to miner's safety.Prior art lacks monitors intuitively and indicates the LED state of temperature, and the user can't carry out manual process according to actual conditions.
Summary of the invention
The utility model provides a kind of LED temperature monitoring and indicating circuit, and it can realize the LED state of temperature is monitored intuitively and indicated.
A kind of LED temperature monitoring and indicating circuit, comprise the temperature detection sensor that is used to detect the LED temperature, the temperature variable sample circuit that to be used for the detected LED temperature transition of temperature detection sensor be electric signal, be used for the electric signal that the temperature variable sample circuit produces is changed into the variable change-over circuit of the drive signal of indicating circuit, the indicating circuit that is used for the indication LED state of temperature, temperature detection sensor is connected with the temperature variable sample circuit, the output terminal of temperature variable sample circuit is connected with the input end of variable change-over circuit, and the output terminal of variable change-over circuit is connected with the input end of indicating circuit.
Wherein, temperature detection sensor is the thermistor NTC1 of negative temperature coefficient, the temperature variable sample circuit comprises Zener VDT, resistance R V, resistance R T1, the variable change-over circuit comprises that model is the chip IC 1 of LM339, resistance R V1, resistance R V2, Zener VD1, Zener VD2, Zener VD3, indicating circuit comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, green LED 1, yellow LED 2, red LED 3, alarm, the end of resistance R V is connected with direct supply V2, the other end of resistance R V, the negative pole of Zener VDT is connected with the end of thermistor NTC1, the other end of thermistor NTC1, the end of resistance R T1 is connected with the 8th pin of chip IC 1, the end of resistance R V1 is connected with direct supply V5, the other end of resistance R V1, the negative pole of Zener VD1 is connected with the 4th pin of IC1, the end of resistance R V2 is connected with direct supply V4, the other end of resistance R V2, the negative pole of Zener VD2 is connected with the 6th pin of IC1, the negative pole of Zener VD3, the 9th pin of IC1 is connected with direct supply V3, one end of resistance R 5, one end of resistance R 6, one end of resistance R 7, the 3rd pin of IC1 is connected with direct supply V6, the other end of resistance R 5, the positive pole of LED 3 is connected with the 14th pin of IC1, the negative pole of LED 3 is connected with an end of resistance R 3, the other end of resistance R 6, the positive pole of LED 2 is connected with the 1st pin of IC1, the negative pole of LED 2 is connected with an end of resistance R 2, the other end of resistance R 7, the positive pole of LED 1, one end of alarm is connected with the 2nd pin of IC1, the negative pole of LED 1 is connected the other end of resistance R 3 with an end of resistance R 1, the other end of resistance R 2, the other end of resistance R 1, the other end of alarm, the positive pole of Zener VD1, the positive pole of Zener VD2, the positive pole of Zener VD3, the positive pole of Zener VDT, the equal ground connection of the other end of resistance R T1.
Wherein, the model of thermistor NTC1 is NTCS0805E3473.
Wherein, temperature detection sensor is the thermistor NTC2 of negative temperature coefficient, the temperature variable sample circuit comprises resistance R T2, the variable change-over circuit comprises n comparator C P, n comparator C P is respectively comparator C P1, comparator C P2, comparator C Pi, comparator C Pn, indicating circuit comprises n LED and n resistance R, n LED is respectively LED 1, LED 2, LED i, LED n, n resistance R is respectively resistance R 1, resistance R 2, resistance R i, resistance R n, the end of thermistor NTC2 is connected with reference voltage Vref, the other end of thermistor NTC2, the end of resistance R T2 is connected with the electrode input end of n comparator C P, the other end ground connection of resistance R T2, the negative input of comparator C P1 is connected with reference voltage Vref 1, the output terminal of comparator C P1 is connected with the positive pole of LED 1, the negative pole of LED 1 is connected with an end of resistance R 1, the other end ground connection of resistance R 1, the negative input of comparator C P2 is connected with reference voltage Vref 2, the output terminal of comparator C P2 is connected with the positive pole of LED 2, the negative pole of LED 2 is connected with an end of resistance R 2, the other end ground connection of resistance R 2, the negative input of comparator C Pi is connected with reference voltage Vref i, the output terminal of comparator C Pi is connected with the positive pole of LED i, the negative pole of LED i is connected with the end of resistance R i, the other end ground connection of resistance R i, the negative input of comparator C Pn is connected with reference voltage Vref n, the output terminal of comparator C Pn is connected with the positive pole of LED n, the negative pole of LED n is connected with the end of resistance R n, the other end ground connection of resistance R n.
Wherein, n is 3 or 4.
Wherein, temperature detection sensor is the thermistor PTC of positive temperature coefficient (PTC), the temperature variable sample circuit comprises resistance R T3, the variable change-over circuit comprises n comparator C P, n comparator C P is respectively comparator C P1, comparator C P2, comparator C Pi, comparator C Pn, indicating circuit comprises n LED and n resistance R, n LED is respectively LED 1, LED 2, LED i, LED n, n resistance R is respectively resistance R 1, resistance R 2, resistance R i, resistance R n, the end of resistance R T3 is connected with reference voltage Vref, the other end of resistance R T3, the end of thermistor PTC is connected with the electrode input end of n comparator C P, the other end ground connection of thermistor PTC, the negative input of comparator C P1 is connected with reference voltage Vref 1, the output terminal of comparator C P1 is connected with the positive pole of LED 1, the negative pole of LED 1 is connected with an end of resistance R 1, the other end ground connection of resistance R 1, the negative input of comparator C P2 is connected with reference voltage Vref 2, the output terminal of comparator C P2 is connected with the positive pole of LED 2, the negative pole of LED 2 is connected with an end of resistance R 2, the other end ground connection of resistance R 2, the negative input of comparator C Pi is connected with reference voltage Vref i, the output terminal of comparator C Pi is connected with the positive pole of LED i, the negative pole of LED i is connected with the end of resistance R i, the other end ground connection of resistance R i, the negative input of comparator C Pn is connected with reference voltage Vref n, the output terminal of comparator C Pn is connected with the positive pole of LED n, the negative pole of LED n is connected with the end of resistance R n, the other end ground connection of resistance R n.
Wherein, n is 3 or 4.
The utility model beneficial effect: a kind of LED temperature monitoring and indicating circuit, comprise the temperature detection sensor that is used to detect the LED temperature, the temperature variable sample circuit that to be used for the detected LED temperature transition of temperature detection sensor be electric signal, be used for the electric signal that the temperature variable sample circuit produces is changed into the variable change-over circuit of the drive signal of indicating circuit, the indicating circuit that is used for the indication LED state of temperature, temperature detection sensor is connected with the temperature variable sample circuit, the output terminal of temperature variable sample circuit is connected with the input end of variable change-over circuit, and the output terminal of variable change-over circuit is connected with the input end of indicating circuit.When LED temperature to be measured reaches a certain value range, indicating circuit sends information to the user, the user handles according to actual operating position, craft is closed LED or is reduced its drive current to reduce luminosity, or take other measure, the utility model can realize the LED state of temperature is monitored intuitively and indicated; The utility model can not closed LED automatically or be reduced operation such as drive current automatically, can prevent the adverse effect that operation automatically brings the user.
Description of drawings
Fig. 1 is a block diagram of the present utility model.
Fig. 2 is the circuit diagram of the utility model embodiment one.
Fig. 3 is the circuit diagram of the utility model embodiment two.
Fig. 4 is the circuit diagram of the utility model embodiment three.
Embodiment
Referring to Fig. 1 to Fig. 4, the utility model is described in detail below in conjunction with accompanying drawing.
Embodiment one
See Fig. 1 Fig. 2, the LED temperature monitoring and the indicating circuit of present embodiment, comprise the temperature detection sensor 100 that is used to detect the LED temperature, the temperature variable sample circuit 200 that to be used for temperature detection sensor 100 detected LED temperature transition be electric signal, be used for the electric signal that temperature variable sample circuit 200 produces is changed into the variable change-over circuit 300 of the drive signal of indicating circuit 400, the indicating circuit 400 that is used for the indication LED state of temperature, temperature detection sensor 100 keeps good heat conduction with light emitting diode matrix LEDS to be measured, temperature detection sensor 100 is connected with temperature variable sample circuit 200, the output terminal of temperature variable sample circuit 200 is connected with the input end of variable change-over circuit 300, and the output terminal of variable change-over circuit 300 is connected with the input end of indicating circuit 400.Temperature detection sensor 100 detects the temperature of light emitting diode matrix LEDS in the present embodiment.
Wherein, the quantity of variable change-over circuit 300 and indicating circuit 400 can surpass two, and the quantity of establishing variable change-over circuit 300 is n, and the quantity of indicating circuit 400 is n, and the quantity of temperature detecting point is n.1, the 2 variable change-over circuit 300 corresponding temperature monitoring point 2, the 1st variable change-over circuit 300 corresponding temperature monitoring points ..., i variable change-over circuit 300 corresponding temperature monitoring point i ..., n variable change-over circuit 300 corresponding temperature monitoring point n.When temperature detection sensor 100 detected light emitting diode matrix LEDS temperature to be measured reach temperature monitoring and put 1, the 1st variable change-over circuit 300 drives 400 work of the 1st indicating circuit, when temperature detection sensor 100 detected light emitting diode matrix LEDS temperature to be measured reach temperature monitoring and put 2, the 2nd variable change-over circuit 300 drives 400 work of the 2nd indicating circuit, when temperature detection sensor 100 detected light emitting diode matrix LEDS temperature to be measured reach temperature monitoring point i, i variable change-over circuit 300 drives 400 work of i indicating circuit, when temperature detection sensor 100 detected light emitting diode matrix LEDS temperature to be measured reached temperature monitoring point n, n variable change-over circuit 300 drove 400 work of n indicating circuit.
In the present embodiment, temperature detection sensor 100 is the thermistor NTC1 of negative temperature coefficient, the resistance of thermistor NTC1 raises with temperature and reduces, temperature variable sample circuit 200 comprises Zener (claiming stabilivolt again) VDT, resistance R V, resistance R T1, variable change-over circuit 300 comprises that model is the chip IC 1 of LM339, resistance R V1, resistance R V2, Zener VD1, Zener VD2, Zener VD3, indicating circuit 400 comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, green LED 1, yellow LED 2, red LED 3, alarm, the end of resistance R V is connected with direct supply V2, the other end of resistance R V, the negative pole of Zener VDT is connected with the end of thermistor NTC1, the other end of thermistor NTC1, the end of resistance R T1 is connected with the 8th pin of chip IC 1, the end of resistance R V1 is connected with direct supply V5, the other end of resistance R V1, the negative pole of Zener VD1 is connected with the 4th pin of IC1, the end of resistance R V2 is connected with direct supply V4, the other end of resistance R V2, the negative pole of Zener VD2 is connected with the 6th pin of IC1, the negative pole of Zener VD3, the 9th pin of IC1 is connected with direct supply V3, one end of resistance R 5, one end of resistance R 6, one end of resistance R 7, the 3rd pin of IC1 is connected with direct supply V6, the other end of resistance R 5, the positive pole of LED 3 is connected with the 14th pin of IC1, the negative pole of LED 3 is connected with an end of resistance R 3, the other end of resistance R 6, the positive pole of LED 2 is connected with the 1st pin of IC1, the negative pole of LED 2 is connected with an end of resistance R 2, the other end of resistance R 7, the positive pole of LED 1, one end of alarm is connected with the 2nd pin of IC1, the negative pole of LED 1 is connected the other end of resistance R 3 with an end of resistance R 1, the other end of resistance R 2, the other end of resistance R 1, the other end of alarm, the positive pole of Zener VD1, the positive pole of Zener VD2, the positive pole of Zener VD3, the positive pole of Zener VDT, the equal ground connection of the other end of resistance R T1.The model of the thermistor NTC1 of present embodiment is NTCS0805E3473, and the alarm of present embodiment is loudspeaker.
Fig. 2 is described, and direct supply DC power is a light emitting diode matrix LEDS(light source) and the utility model power supply, be included as IC1, reference voltage etc. power supply is provided.Thermistor NTC1 detects the temperature of light emitting diode matrix LEDS, and wherein, thermistor NTC1 is close to the heat-radiating substrate of light emitting diode matrix LEDS, the heat conduction good with its maintenance.Direct supply V2 obtains stable reference voltage Vref by Zener VDT voltage stabilizing.Vref obtains voltage VT by thermistor NTC1 and resistance R T1 dividing potential drop.Direct supply V3 obtains stable reference voltage Vref 3 by Zener VD3 voltage stabilizing, and direct supply V4 obtains stable reference voltage Vref 2 by Zener VD2 voltage stabilizing, and direct supply V5 obtains stable reference voltage Vref 1 by Zener VD1 voltage stabilizing.Wherein, direct supply V6 is the 36V DC voltage, and it can be the IC1 power supply, provides and draws level by resistance R 5, its three tunnel output OUT1, OUT2, OUT3 that can be IC1 of R6, R7 simultaneously.Three tunnel outputs drive green LED 1, yellow LED 2, red LED 3 respectively, and alarm alarm.The model of chip IC 1 is LM339, and its inner structure and parameter please refer to existing open source information, repeat no more here.Chip IC 1 is integrated 4 groups of comparers, INPUT 1+, INPUT 1-, INPUT 2+, INPUT 2-, INPUT 3+, INPUT 3-, INPUT 4+, INPUT 4-are respectively the input end of four groups of comparers, OUTPUT 1, OUTPUT 2, OUTPUT 3, OUTPUT 4 are respectively the output terminal of four groups of comparers, and the utility model has been used three groups of comparers wherein.The thermistor NTC of the negative temperature coefficient that embodiment adopts is the NTCS0805E3473 of VISHAY company, and the parameters such as corresponding relation of its temperature and resistance please refer to existing open source information, repeat no more here.
Green LED 1, yellow LED 2, red LED 3, alarm are used for the indication LED state of temperature.When the temperature that detects light emitting diode matrix LEDS is lower than temperature monitoring and puts 1, green LED 1 is bright, the temperature of prompting light emitting diode matrix LEDS is normal, be in good working order, at this moment, Huang Se LED 2, red LED 3, alarm are not all worked.When the temperature of light emitting diode matrix LEDS is elevated to temperature monitoring and puts 2, yellow LED 2 is bright, the user is sounded a warning, the temperature of prompting light emitting diode matrix LEDS raises greatly, output efficiency seriously descends, but temperature also in safe range, at this moment, do not work by red light and alarm.When light emitting diode matrix LEDS temperature is increased to temperature monitoring when putting 3, red light and alarm alarm will open, and the user is proposed grave warning, and the temperature of prompting light emitting diode matrix LEDS is near the temperature of damage; If do not take corresponding measure, for example close light emitting diode matrix LEDS or reduce its drive current, may cause serious consequences such as light emitting diode matrix LEDS damage.
In the present embodiment, temperature monitoring point 1,2,3 is arranged on 55 ℃, 75 ℃, 90 ℃, model be the thermistor NTC1 of NTCS0805E3473 at 55 ℃, 75 ℃, the resistance in the time of 90 ℃ is respectively 4.87k, 2.54k, 1.62k.The resistance of resistance R T1 is 2K, and direct supply V2 output 22V DC voltage obtains the 20V reference voltage Vref after the Zener VDT voltage stabilizing by 20V, and in the time of can calculating 55 ℃, 75 ℃, 90 ℃, the value of VT is respectively 5.8v, 8.8v, 11v.Consider the hysteresis of temperature transfer and the versatility of element, reference voltage Vref 1, Vref2, Vref3 are set to 5.6v, 8.2v, 11v.Direct supply V5 output 6V DC voltage, direct supply V4 output 10V DC voltage, direct supply V3 output 12V DC voltage, Zener VD1 is the 5.6V stabilivolt, and Zener VD2 is the 8.2V stabilivolt, and Zener VD3 is the 11V stabilivolt.
When the detected light emitting diode matrix LEDS of thermistor NTC1 temperature during 55 ℃ of left and right sides, VT is less than 5.6v, this moment chip IC 1 INPUT 1+＞INPUT 1-, OUTPUT 1 output high level, green LED 1 is luminous, and prompting light emitting diode matrix LEDS temperature is in the good range.When the detected light emitting diode matrix LEDS of thermistor NTC1 temperature is increased to greater than 55 ℃, VT voltage is between 10v to 15v, this moment chip IC 1 OUTPUT 1, OUTPUT 2, OUTPUT 3 equal output low levels, all pilot lamp and alarm are all closed.When the detected light emitting diode matrix LEDS of NTC temperature reaches 75 ℃ of left and right sides, VT surpasses 8.2V, this moment INPUT 2+＞INPUT 2-, OUTPUT 2 will export high level, yellow LED 2 beginnings are luminous, prompting user light emitting diode matrix LEDS has been elevated to higher temperature, and output efficiency reduces greatly.When the detected light emitting diode matrix LEDS of thermistor NTC1 temperature reaches 90 ℃ of left and right sides, VT voltage surpasses 11V, this moment INPUT 2+＞INPUT 2-, INPUT 3+＞INPUT 3-, OUTPUT 2, and OUTPUT 3 all exports high level, and the LED 3 of yellow LED 2, redness is all luminous, alarm alarm also sends chimes of doom, and the temperature of prompting light emitting diode matrix LEDS is near the dangerous temperature of its damage.
Need to prove, the utility model does not limit the concrete parameter value of above-mentioned components and parts, present technique field those of ordinary skill according to common practise and normal experiment, need not the concrete parameter value that creative work just can rationally be determined above-mentioned components and parts when practical application the utility model.Need to prove; indicating circuit 400, variable change-over circuit 300, temperature variable sample circuit 200, temperature detection sensor 100 can use other equivalent structure that can realize identical function, and present technique field those of ordinary skill need not the scope that change that creative work carries out the utility model all belongs to the utility model protection.
Embodiment two
See Fig. 1 Fig. 3, the LED temperature monitoring and the indicating circuit of present embodiment, comprise the temperature detection sensor 100 that is used to detect the LED temperature, the temperature variable sample circuit 200 that to be used for temperature detection sensor 100 detected LED temperature transition be electric signal, be used for the electric signal that temperature variable sample circuit 200 produces is changed into the variable change-over circuit 300 of the drive signal of indicating circuit 400, the indicating circuit 400 that is used for the indication LED state of temperature, temperature detection sensor 100 is connected with temperature variable sample circuit 200, the output terminal of temperature variable sample circuit 200 is connected with the input end of variable change-over circuit 300, and the output terminal of variable change-over circuit 300 is connected with the input end of indicating circuit 400.
In the present embodiment, temperature detection sensor 100 is the thermistor NTC2 of negative temperature coefficient, temperature variable sample circuit 200 comprises resistance R T2, variable change-over circuit 300 comprises n comparator C P, n comparator C P be respectively comparator C P1, comparator C P2 ..., comparator C Pi ..., comparator C Pn, indicating circuit 400 comprises n LED and n resistance R, n LED be respectively LED 1, LED 2 ..., LED i ..., LED n; Be that n LED is respectively 1,2 ..., i ..., n, 1＜i＜n.N resistance R be respectively resistance R 1, resistance R 2 ..., resistance R i ..., resistance R n.The end of thermistor NTC2 is connected with reference voltage Vref, the other end of thermistor NTC2, the end of resistance R T2 is connected with the electrode input end of n comparator C P, the other end ground connection of resistance R T2, the negative input of comparator C P1 is connected with reference voltage Vref 1, the output terminal of comparator C P1 is connected with the positive pole of LED 1, the negative pole of LED 1 is connected with an end of resistance R 1, the other end ground connection of resistance R 1, the negative input of comparator C P2 is connected with reference voltage Vref 2, the output terminal of comparator C P2 is connected with the positive pole of LED 2, the negative pole of LED 2 is connected with an end of resistance R 2, the other end ground connection of resistance R 2, the negative input of comparator C Pi is connected with reference voltage Vref i, the output terminal of comparator C Pi is connected with the positive pole of LED i, the negative pole of LED i is connected with the end of resistance R i, the other end ground connection of resistance R i, the negative input of comparator C Pn is connected with reference voltage Vref n, the output terminal of comparator C Pn is connected with the positive pole of LED n, the negative pole of LED n is connected with the end of resistance R n, the other end ground connection of resistance R n.In the present embodiment, n can be 3 or 4; Certainly, n can also be quantity such as 5,6,7,8, and the quantity of n can be determined according to concrete application.
The resistance of thermistor NTC2 raises with temperature and reduces, and when LED temperature to be measured raise, the resistance of RTC reduced, and voltage VT increases, and has finished change with temperature and has transformed change for electric signal.When LED temperature to be measured reached a certain temperature 1, VT was elevated to greater than Vref1 less than Vref2, and comparator C P1 will export high level this moment, and driven for emitting lights diode (LED) 1 is luminous; When LED temperature to be measured continues to raise, make Vrefn＞...＞Vrefi＞... during＞VT＞Vref2＞Vref1, comparator C P1, comparator C P2 all export high level, and LED 1, LED 2 are all luminous; When LED temperature to be measured continues to raise, make VT＞Vrefn＞...＞Vrefi＞...＞Vref2＞Vref1.Comparator C P1, comparator C P2 ..., comparator C Pi ..., comparator C Pn all exports high level, LED 1, LED 2 ..., LED i ..., LED n is all luminous.
Need to prove, the utility model does not limit the concrete parameter value of above-mentioned components and parts, present technique field those of ordinary skill according to common practise and normal experiment, need not the concrete parameter value that creative work just can rationally be determined above-mentioned components and parts when practical application the utility model.Need to prove; indicating circuit 400, variable change-over circuit 300, temperature variable sample circuit 200, temperature detection sensor 100 can use other equivalent structure that can realize identical function, and present technique field those of ordinary skill need not the scope that change that creative work carries out the utility model all belongs to the utility model protection.
Embodiment three
See Fig. 1 Fig. 4, the LED temperature monitoring and the indicating circuit of present embodiment, comprise the temperature detection sensor 100 that is used to detect the LED temperature, the temperature variable sample circuit 200 that to be used for temperature detection sensor 100 detected LED temperature transition be electric signal, be used for the electric signal that temperature variable sample circuit 200 produces is changed into the variable change-over circuit 300 of the drive signal of indicating circuit 400, the indicating circuit 400 that is used for the indication LED state of temperature, temperature detection sensor 100 is connected with temperature variable sample circuit 200, the output terminal of temperature variable sample circuit 200 is connected with the input end of variable change-over circuit 300, and the output terminal of variable change-over circuit 300 is connected with the input end of indicating circuit 400.
In the present embodiment, temperature detection sensor 100 is the thermistor PTC of positive temperature coefficient (PTC), temperature variable sample circuit 200 comprises resistance R T3, variable change-over circuit 300 comprises n comparator C P, n comparator C P is respectively comparator C P1, comparator C P2, comparator C Pi, comparator C Pn, indicating circuit 400 comprises n LED and n resistance R, n LED is respectively LED 1, LED 2, LED i, LED n, n resistance R is respectively resistance R 1, resistance R 2, resistance R i, resistance R n, the end of resistance R T3 is connected with reference voltage Vref, the other end of resistance R T3, the end of thermistor PTC is connected with the electrode input end of n comparator C P, the other end ground connection of thermistor PTC, the negative input of comparator C P1 is connected with reference voltage Vref 1, the output terminal of comparator C P1 is connected with the positive pole of LED 1, the negative pole of LED 1 is connected with an end of resistance R 1, the other end ground connection of resistance R 1, the negative input of comparator C P2 is connected with reference voltage Vref 2, the output terminal of comparator C P2 is connected with the positive pole of LED 2, the negative pole of LED 2 is connected with an end of resistance R 2, the other end ground connection of resistance R 2, the negative input of comparator C Pi is connected with reference voltage Vref i, the output terminal of comparator C Pi is connected with the positive pole of LED i, the negative pole of LED i is connected with the end of resistance R i, the other end ground connection of resistance R i, the negative input of comparator C Pn is connected with reference voltage Vref n, the output terminal of comparator C Pn is connected with the positive pole of LED n, the negative pole of LED n is connected with the end of resistance R n, the other end ground connection of resistance R n.Wherein, n is 3 or 4; Certainly, n can also be quantity such as 5,6,7,8, and the quantity of n can be determined according to concrete application.
The difference of present embodiment and embodiment two is, present embodiment uses the thermistor PTC of positive temperature coefficient (PTC), and embodiment two uses the thermistor NTC2 of negative temperature coefficient, the operation logic of present embodiment and embodiment two is basic identical, present technique field those of ordinary skill can reference example two be derived voluntarily, repeats no more here.
Above content only is preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (7)
1. LED temperature monitoring and indicating circuit, it is characterized in that: comprise the temperature detection sensor that is used to detect the LED temperature, the temperature variable sample circuit that to be used for the detected LED temperature transition of temperature detection sensor be electric signal, be used for the electric signal that the temperature variable sample circuit produces is changed into the variable change-over circuit of the drive signal of indicating circuit, the indicating circuit that is used for the indication LED state of temperature, temperature detection sensor is connected with the temperature variable sample circuit, the output terminal of temperature variable sample circuit is connected with the input end of variable change-over circuit, and the output terminal of variable change-over circuit is connected with the input end of indicating circuit.
2. a kind of LED temperature monitoring according to claim 1 and indicating circuit, it is characterized in that: described temperature detection sensor is the thermistor NTC1 of negative temperature coefficient, described temperature variable sample circuit comprises Zener VDT, resistance R V, resistance R T1, described variable change-over circuit comprises that model is the chip IC 1 of LM339, resistance R V1, resistance R V2, Zener VD1, Zener VD2, Zener VD3, described indicating circuit comprises resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, green LED 1, yellow LED 2, red LED 3, alarm, the end of resistance R V is connected with direct supply V2, the other end of resistance R V, the negative pole of Zener VDT is connected with the end of thermistor NTC1, the other end of thermistor NTC1, the end of resistance R T1 is connected with the 8th pin of chip IC 1, the end of resistance R V1 is connected with direct supply V5, the other end of resistance R V1, the negative pole of Zener VD1 is connected with the 4th pin of IC1, the end of resistance R V2 is connected with direct supply V4, the other end of resistance R V2, the negative pole of Zener VD2 is connected with the 6th pin of IC1, the negative pole of Zener VD3, the 9th pin of IC1 is connected with direct supply V3, one end of resistance R 5, one end of resistance R 6, one end of resistance R 7, the 3rd pin of IC1 is connected with direct supply V6, the other end of resistance R 5, the positive pole of LED 3 is connected with the 14th pin of IC1, the negative pole of LED 3 is connected with an end of resistance R 3, the other end of resistance R 6, the positive pole of LED 2 is connected with the 1st pin of IC1, the negative pole of LED 2 is connected with an end of resistance R 2, the other end of resistance R 7, the positive pole of LED 1, one end of alarm is connected with the 2nd pin of IC1, the negative pole of LED 1 is connected the other end of resistance R 3 with an end of resistance R 1, the other end of resistance R 2, the other end of resistance R 1, the other end of alarm, the positive pole of Zener VD1, the positive pole of Zener VD2, the positive pole of Zener VD3, the positive pole of Zener VDT, the equal ground connection of the other end of resistance R T1.
3. a kind of LED temperature monitoring according to claim 2 and indicating circuit is characterized in that: the thermistor NTC1 that described thermistor NTC1 is model NTCS0805E3473.
4. a kind of LED temperature monitoring according to claim 1 and indicating circuit, it is characterized in that: described temperature detection sensor is the thermistor NTC2 of negative temperature coefficient, described temperature variable sample circuit comprises resistance R T2, described variable change-over circuit comprises n comparator C P, n comparator C P is respectively comparator C P1, comparator C P2, comparator C Pi, comparator C Pn, described indicating circuit comprises n LED and n resistance R, n LED is respectively LED 1, LED 2, LED i, LED n, n resistance R is respectively resistance R 1, resistance R 2, resistance R i, resistance R n, the end of thermistor NTC2 is connected with reference voltage Vref, the other end of thermistor NTC2, the end of resistance R T2 is connected with the electrode input end of n comparator C P, the other end ground connection of resistance R T2, the negative input of comparator C P1 is connected with reference voltage Vref 1, the output terminal of comparator C P1 is connected with the positive pole of LED 1, the negative pole of LED 1 is connected with an end of resistance R 1, the other end ground connection of resistance R 1, the negative input of comparator C P2 is connected with reference voltage Vref 2, the output terminal of comparator C P2 is connected with the positive pole of LED 2, the negative pole of LED 2 is connected with an end of resistance R 2, the other end ground connection of resistance R 2, the negative input of comparator C Pi is connected with reference voltage Vref i, the output terminal of comparator C Pi is connected with the positive pole of LED i, the negative pole of LED i is connected with the end of resistance R i, the other end ground connection of resistance R i, the negative input of comparator C Pn is connected with reference voltage Vref n, the output terminal of comparator C Pn is connected with the positive pole of LED n, the negative pole of LED n is connected with the end of resistance R n, the other end ground connection of resistance R n.
5. a kind of LED temperature monitoring according to claim 4 and indicating circuit is characterized in that: described n is 3 or 4.
6. a kind of LED temperature monitoring according to claim 1 and indicating circuit, it is characterized in that: described temperature detection sensor is the thermistor PTC of positive temperature coefficient (PTC), described temperature variable sample circuit comprises resistance R T3, described variable change-over circuit comprises n comparator C P, n comparator C P is respectively comparator C P1, comparator C P2, comparator C Pi, comparator C Pn, described indicating circuit comprises n LED and n resistance R, n LED is respectively LED 1, LED 2, LED i, LED n, n resistance R is respectively resistance R 1, resistance R 2, resistance R i, resistance R n, the end of resistance R T3 is connected with reference voltage Vref, the other end of resistance R T3, the end of thermistor PTC is connected with the electrode input end of n comparator C P, the other end ground connection of thermistor PTC, the negative input of comparator C P1 is connected with reference voltage Vref 1, the output terminal of comparator C P1 is connected with the positive pole of LED 1, the negative pole of LED 1 is connected with an end of resistance R 1, the other end ground connection of resistance R 1, the negative input of comparator C P2 is connected with reference voltage Vref 2, the output terminal of comparator C P2 is connected with the positive pole of LED 2, the negative pole of LED 2 is connected with an end of resistance R 2, the other end ground connection of resistance R 2, the negative input of comparator C Pi is connected with reference voltage Vref i, the output terminal of comparator C Pi is connected with the positive pole of LED i, the negative pole of LED i is connected with the end of resistance R i, the other end ground connection of resistance R i, the negative input of comparator C Pn is connected with reference voltage Vref n, the output terminal of comparator C Pn is connected with the positive pole of LED n, the negative pole of LED n is connected with the end of resistance R n, the other end ground connection of resistance R n.
7. a kind of LED temperature monitoring according to claim 6 and indicating circuit is characterized in that: described n is 3 or 4.
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| CN2011200192681U CN202033126U (en) | 2011-01-21 | 2011-01-21 | LED temperature monitoring and indicating circuit |
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| CN2011200192681U CN202033126U (en) | 2011-01-21 | 2011-01-21 | LED temperature monitoring and indicating circuit |
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| CN202033126U true CN202033126U (en) | 2011-11-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754806A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit |
| CN104754813A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit and flashlight |
| CN105258809A (en) * | 2015-11-06 | 2016-01-20 | 广西职业技术学院 | Temperature indicator for making green tea |
| CN106095650A (en) * | 2016-05-31 | 2016-11-09 | 深圳市双赢伟业科技股份有限公司 | The operating temperature display methods of switch and device |
-
2011
- 2011-01-21 CN CN2011200192681U patent/CN202033126U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754806A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit |
| CN104754813A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit and flashlight |
| CN105258809A (en) * | 2015-11-06 | 2016-01-20 | 广西职业技术学院 | Temperature indicator for making green tea |
| CN106095650A (en) * | 2016-05-31 | 2016-11-09 | 深圳市双赢伟业科技股份有限公司 | The operating temperature display methods of switch and device |
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