CN203643030U - Temperature indicating circuit and electronic products - Google Patents
Temperature indicating circuit and electronic products Download PDFInfo
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- CN203643030U CN203643030U CN201320866288.1U CN201320866288U CN203643030U CN 203643030 U CN203643030 U CN 203643030U CN 201320866288 U CN201320866288 U CN 201320866288U CN 203643030 U CN203643030 U CN 203643030U
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Abstract
The utility model discloses a temperature indicating circuit and electronic products. The temperature indicating circuit comprises a power supply power source, a voltage stabilizing circuit, an LED and a thermistor; the power supply power source outputs a stable DC voltage through the voltage stabilizing circuit, and the stable DC voltage is output to a series branch of the LED and the thermistor; a NPN type triode is arranged in the voltage stabilizing circuit, the collecting electrode of the triode is connected with the power supply power source through a first resistor, the base electrode of the triode is connected with the power supply power source through a second resistor, and the emitting electrode of the triode is grounded through a third resistor; and the collecting electrode of the triode outputs the DC voltage. The temperature indicating circuit is simple in circuit structure and low in cost; the voltage stabilizing circuit is additionally disposed in the temperature indicating circuit, so brightness of the LED can be guaranteed to not be changed with voltage changes of the power supply power source, and thus accuracy of temperature indication is ensured; and the temperature indicating circuit can be widely applied to circuit design of the electronic products needing a light-emitting indication function, so whole machine cost is lowered, and product quality is improved.
Description
Technical field
The utility model belongs to indicating lamp control circuit technical field, specifically, relates to a kind of brightness that utilizes pilot lamp and changes the electronic product that carries out the circuit structure design of temperature indication and adopt this temperature indicator circuit to design.
Background technology
For current a lot of electronic products, temperature parameter is in electronic product operational process, to need a key parameter of monitoring in real time, because its variation can reflect from a side the current operation conditions of electronic product internal circuit board.In the time that the running temperature of electronic product is too high, probably because its internal circuit plate fault causes.Therefore, utilize temperature variation to carry out fault pre-alarming, become a kind of technological means that at present a lot of electronic products often adopt in the time realizing Self-Test Diagnostics function.
Light emitting diode LED is a kind of electroluminescent semiconductor material, and it mainly plays deixis in electronic product, also can play the effect of demonstration, illumination.Because LED compares other luminescent devices, have that volume is little, power consumption is low, long service life, high brightness, a significant advantage such as low in calories, therefore, in the indicating circuit design of electronic product, obtain application more and more widely.
But the indicating circuit that adopts at present LED to design, is all often the deixis of lighting or extinguish to realize electronic product duty by controlling LED.How to utilize the luminance of LED, realize accurate indication to electronic product temperature variation, at present to those skilled in the art still in exploring, the experimental stage of research and development.
Summary of the invention
The purpose of this utility model is to provide a kind of temperature indicator circuit and electronic product of the LED of utilization design, realizes the deixis to electronic product temperature variation by the luminosity that changes LED.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of temperature indicator circuit, comprises power supply, mu balanced circuit, LED and thermistor; Described power supply, by the DC voltage of mu balanced circuit stable output, exports the series arm of LED and thermistor to; In described mu balanced circuit, be provided with a NPN type triode, the collector of described triode connects power supply by the first resistance, and base stage connects power supply by the second resistance, and emitter is by the 3rd resistance eutral grounding; The resistance of described the first resistance, the second resistance and the 3rd resistance meets formula:
Wherein, R1, R2, R3 are respectively the resistance of the first resistance, the second resistance and the 3rd resistance, and the alternating current amplification coefficient that β is triode is constant; By the described DC voltage of collector output of described triode.
Further, the series arm of described LED and thermistor comprises many, after many series arm parallel connections, is connected between the DC voltage output end and ground of mu balanced circuit.
In order to realize the design requirement that adopts change color indication product temperature to change, described series arm comprises two, article two, the glow color difference of the LED in series arm, and the thermistor that wherein thermistor in a series arm is positive temperature coefficient (PTC), the thermistor that the thermistor in another series arm is negative temperature coefficient.By increasing colour contrast, further to improve the sensitivity of indicating circuit to temperature variation response.
Preferably, thermistor described in two under normal temperature state resistance equate, preferably in the time of 25 ℃ resistance equate, can realize thus electronic product in its working temperature under normal temperature state, the mixing light sending by LED is just neutral color, is convenient to user's identification.
Equate in order further to realize two LEDs luminous intensity at normal temperatures, in two described series arms, the pressure drop of two LEDs equates.
Even in order to guarantee that the resistance of thermistor is at 1 o'clock, can be because of the electric current in series arm not excessive and cause occurring the problem that LED overcurrent damages yet, the utility model is difference series limiting resistor in the series arm described in each preferably, to realize the restriction to Current rise amplitude in series arm.
Preferably, be connected on each the current-limiting resistance in described series arm resistance equate.
In order to occur at system temperature when abnormal; can implement protection in time to circuit system; the utility model is also further provided with voltage monitoring unit in described temperature indicator circuit; connect described current-limiting resistance; by the voltage at detectability leakage resistance two ends; judge the working temperature of circuit system; and compare with pre-set threshold value; and then according to temperature variation, system power supply is carried out to break-make control; adopt the mode of cutting system power supply in the time that system temperature is abnormal, realize the overheated of circuit system or cross cold protection.
Further, in the current supply circuit of described system power supply, be connected with on-off circuit, the control signal of described on-off circuit receiver voltage monitoring means output, carries out break-make control to described current supply circuit.
For realizing aforementioned goal of the invention of the present utility model, the electronic product proposing for the utility model, is achieved by the following technical solutions:
A kind of electronic product, is provided with power supply, mu balanced circuit, LED and thermistor; Described power supply, by the DC voltage of mu balanced circuit stable output, exports the series arm of LED and thermistor to; In described mu balanced circuit, be provided with a NPN type triode, the collector of described triode connects power supply by the first resistance, and base stage connects power supply by the second resistance, and emitter is by the 3rd resistance eutral grounding; The resistance of described the first resistance, the second resistance and the 3rd resistance meets formula:
Wherein, R1, R2, R3 are respectively the resistance of the first resistance, the second resistance and the 3rd resistance, and the alternating current amplification coefficient that β is triode is constant; By the described DC voltage of collector output of described triode.
Compared with prior art, advantage of the present utility model and good effect are: temperature indicator circuit of the present utility model adopts LED to carry out luminous indication as light source, low in energy consumption, heat is little, stable performance, not only can reach indicating effect, and by the LED of different colours being set and coordinating the thermistor of different temperature coefficients, and then can change by the brightness light and shade of controlling different LED, generate the variation of the guidance light indicated temperature of different colours, can, in meeting indication requirement, further improve display effect and aesthetic measure thus.In addition, by set up mu balanced circuit in temperature indicator circuit, the brightness variation that can guarantee LED can not be because the change in voltage of power supply causes, and has then guaranteed the accuracy of temperature indication.Temperature indicator circuit of the present utility model, circuit structure is simple, with low cost, can be widely used in the circuit design of electronic product of the luminous deixis of various needs, to reduce complete machine cost, improves product quality.
Read by reference to the accompanying drawings after the detailed description of the utility model embodiment, other features of the present utility model and advantage will become clearer.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of the temperature indicator circuit that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a specific embodiment of the temperature indicator circuit that proposes of the utility model;
Fig. 3 is the circuit theory diagrams of the another one specific embodiment of the temperature indicator circuit that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
Temperature indicator circuit of the present utility model, the characteristic of utilizing the luminosity of light emitting diode LED to change along with flowing through the variation of its electric current is carried out circuit design, the size of current that flows through LED by control changes the luminosity of LED, then reaches the object of indication.
The curent change of considering LED may be not only because the variation of temperature causes, in the time exporting the power supply generation voltage fluctuation of LED to, also can cause the electric current that flows through LED and change, thereby cause the luminosity of LED to change.Therefore, be only the curent change that regulates LED by temperature-sensing element, be obviously the accuracy that cannot guarantee deixis.
Given this, the utility model is in the time of design temperature indicating circuit, introduce the structural design of mu balanced circuit, shown in Figure 1, mu balanced circuit is connected with the power supply VCC powering for LED, receive the supply voltage of power supply VCC output, and described supply voltage is carried out after voltage stabilizing processing, generate galvanic current and press V1, export LED display circuit to, thereby the brightness that has guaranteed LED changes and only caused by the temperature variation of circuit system, then guarantee the accuracy of LED indication.
Below by a specific embodiment, concrete assembling structure and the principle of work thereof of the temperature indicator circuit that the utility model is proposed are at length set forth.
Shown in Figure 2, the temperature indicator circuit of the present embodiment adopts a NPN type triode Q1 to coordinate peripheral resistance, is designed to described mu balanced circuit, realizes the stable control to power supply VCC output voltage.The collector of described NPN type triode Q1 is connected to power supply VCC by the first resistance R 1, and base stage connects described power supply VCC by the second resistance R 2 of series connection, and emitter is by the 3rd resistance R 3 ground connection of series connection.Owing to being in series with the 3rd resistance R 3 at the emitter of NPN type triode Q1, therefore, can guarantee that triode Q1 always works in magnifying state, make the base current I of triode Q1
bwith collector current I
cbe multiple relation,
.Wherein, β is the alternating current amplification coefficient of triode, is constant.Thus, just make collector current I
cin controllable state, realize voltage stabilizing output function.
Specifically, from the mu balanced circuit shown in Fig. 2, can find out:
V1=VCC-VR1 ①；
Wherein, V1 is that the galvanic current of exporting by mu balanced circuit is pressed by the DC voltage of the collector output of NPN type triode Q1; VR1 is the voltage at the first resistance R 1 two ends.Due to
VCC=I
B×R2+V
BE+I
E×R3 ②；
Again because triode Q1 is operated in magnifying state, I
e=(1+ β) I
btherefore 2. substitution formula obtains:
VCC=I
B×R2+V
BE+（1+β）I
B×R3；
Can obtain thus:
Due to the junction voltage V of triode Q1
bEcompare VCC, pressure value is very little, can ignore, thereby 3. formula can be transformed into:
Due to V1=VCC-VR1=VCC-I
c× R1, in the time that VCC voltage increases, can make the base current I of triode Q1
bbecome large.Due to triode, Q1 is operated in amplification region, therefore the collector current I of triode Q1
calso become large thereupon, and I
c=β × I
b.Along with collector current I
cchange large, the voltage at the first resistance R 1 two ends also thereupon increase, that is to say that the increase of VCC also can cause that the change of VR1 is large.In the time that the voltage of VCC increases Δ VCC, from formula 4.: I
bcurrent value increase
.Because I
c=β × I
btherefore,
, now, the dividing potential drop increment at the first resistance R 1 two ends is:
Make DC voltage V1 stable, meet:
As can be seen here, as long as the resistance of resistance R 1, R2, R3 is reasonably configured, its resistance is met the following conditions:
，
Can make
, then guarantee that the DC voltage V1 exporting by mu balanced circuit is constant.
Pressing V1 to offer LED display circuit the galvanic current of exporting by mu balanced circuit, is the power supply of LED display circuit, can guarantee that the brightness of LED changes the accurately temperature variation of reflection circuit system.
In the present embodiment, described power supply VCC can directly be provided by the system power supply of electronic product, also can be carried out after voltage transformation through the power-switching circuit of electronic product inside by system power supply, indirect supply, or directly powered by external power supplys such as button cells, the present embodiment does not specifically limit this.
As a kind of specific design mode of described LED display circuit, can adopt thermistor RT of a light emitting diode LED series connection to set up and form, be connected between the DC voltage V1 output terminal and ground of mu balanced circuit, shown in Figure 2.The resistance of utilizing thermistor RT varies with temperature and the characteristic that changes, regulates and flows through the size of current of light emitting diode LED, thereby utilize the change of LED luminosity, realizes the deixis of temperature variation.
Specifically,, in the time adopting the thermistor RT of negative temperature coefficient to connect LED to build described LED display circuit, in the time that the temperature of circuit system raises, the resistance of thermistor RT reduces, thereby makes the electric current that flows through LED become large, causes the luminosity of LED to strengthen; Otherwise in the time that the temperature of circuit system reduces, it is large that the resistance of thermistor RT becomes, thereby the electric current that flows through LED is diminished, and then cause the luminosity of LED to weaken.Thus one, user can change by the power of observing LED luminosity, pick out exactly the temperature variation of circuit system.
For fear of when the resistance vanishing of thermistor RT, damage the generation of problem because flowing through the excessive LED of causing of electric current of LED, the present embodiment is a current-limiting resistance R4 of further series connection in described LED display circuit preferably, shown in Figure 2, utilize LED, thermistor RT and current-limiting resistance R4 to form series arm, be connected between the DC voltage V1 output terminal and ground of mu balanced circuit, utilize the metering function of current-limiting resistance R4 to described series arm, limit the size of current that flows through LED, then improve the reliability of LED work.
For too high in the working temperature of circuit system or when too low; can enter protected mode by automatic control system circuit; to avoid the generation of fault or to expand further; the present embodiment can also further be set up voltage monitoring unit in described temperature indicator circuit; shown in Figure 2; connect current-limiting resistance R4, the magnitude of voltage at current-limiting resistance R4 two ends is detected.In the time that voltage monitoring unit detects that the magnitude of voltage at current-limiting resistance R4 two ends exceedes setting threshold (the setting threshold here comprises max-thresholds and minimum threshold two parts); the current supply circuit of cutting system power supply; control system down circuitry, out of service, to realize failure protection function.
In order further to strengthen indicating effect, obtain a kind of indicating effect that can reflect according to the change color of pilot lamp temperature variation, to strengthen user's identification, the present embodiment is in the time of design LED display circuit, series arm to LED and thermistor formation is carried out multichannel expansion, and by after multiple series series branch circuit parallel connection, be connected between the DC voltage V1 output terminal and ground of mu balanced circuit.By select the light emitting diode LED of different colours in each series arm, to be mixed to form the display light of different colours, to be convenient to user and to identify fast.
Same; for the object to LED overcurrent protection in each series arm; the present embodiment is further series limiting resistor in each described series arm preferably; even if to guarantee when the resistance vanishing of thermistor, the maximum safe current when electric current that flows through each series arm is still normally worked lower than LED.
To lay two series arms as example simultaneously, the specific works principle of described temperature indicator circuit is at length set forth below.
Shown in Figure 3, the present embodiment can be in the time that circuit system temperature be normal in order to realize one, and indication is yellow; In the time of circuit system excess Temperature, indication is red; In the time that circuit system temperature is too low, indication is green, thereby make the change color demonstrating can more meet current user's identification custom, the present embodiment is selected the thermistor RT1 of green emitting diode LED1 and positive temperature coefficient (PTC) therein in a series arm, selects the thermistor RT2 of emitting red light diode LED2 and negative temperature coefficient in an other series arm; Current-limiting resistance R5, a R6 connect respectively in two series arms.Configure two thermistor RT1, the RT2 resistance of (for example 25 ℃ time) under normal temperature state and equate, the resistance of two current-limiting resistance R5, R6 equates, the pressure drop at two light emitting diode LED1, LED2 two ends equates.
When the working temperature of circuit system is during in normal condition, the resistance of two thermistor RT1, RT2 is substantially equal, thereby the electric current that makes to flow through two light emitting diode LED1, LED2 is substantially equal, the luminous intensity of two light emitting diode LED1, LED2 is substantially suitable, what now, show is a kind of gold-tinted being mixed by the suitable ruddiness of intensity and green glow.
In the time of the temperature rise of circuit system, the resistance of two thermistor RT1, RT2 occurs significantly to change, and wherein, the thermistor RT1 of positive temperature coefficient (PTC) is with the rising of temperature, and it is large that resistance becomes; The thermistor RT2 of negative temperature coefficient is with the rising of temperature, and resistance diminishes.Now, because the resistance of thermistor RT1 increases, and cause the electric current I 1 that flows through green emitting diode LED1 to diminish, brightness dies down; Because the resistance of thermistor RT2 diminishes, and cause the electric current I 2 that flows through emitting red light diode LED2 to become large, brightness grow.Just present thus a kind of temperature along with circuit system and raise gradually, the indicating effect that Show Color reddens gradually.In the time of the excess Temperature of circuit system, electric current I 2 is much larger than electric current I 1, thereby makes the brightness of ruddiness far away higher than the brightness of green glow, makes Show Color become the redness of high brightness, the indicating effect of the ruddiness early warning that reaches a high temperature.
Otherwise in the time that the temperature of circuit system declines, the thermistor RT1 of positive temperature coefficient (PTC) is with the reduction of temperature, resistance diminishes; The thermistor RT2 of negative temperature coefficient is with the reduction of temperature, and it is large that resistance becomes.Now, because the resistance of thermistor RT1 reduces, and cause the electric current I 1 that flows through green emitting diode LED1 to become large, brightness grow; And because the resistance of thermistor RT2 increases, and causing the electric current I 2 that flows through emitting red light diode LED2 to diminish, brightness dies down.Just present thus a kind of temperature along with circuit system and reduce gradually, Show Color turns green indicating effect gradually.In the time that the temperature of circuit system is too low, electric current I 2 is much smaller than electric current I 1, thereby makes the brightness of green glow far away higher than the brightness of ruddiness, makes Show Color become the green of high brightness, reaches the indicating effect of low temperature green glow early warning.
Thus one, user only needs the change color of viewing lamp, and whether the working temperature that can judge accurately, intuitively current system circuit is normal, to take in time necessary emergency measure.
For too high in the working temperature of circuit system or when too low; can enter protected mode by automatic control system circuit; to avoid the generation of fault or to expand further; the present embodiment has also been set up voltage monitoring unit in described temperature indicator circuit; shown in Figure 3; connect current-limiting resistance R5 or R6, the magnitude of voltage at current-limiting resistance R5 or R6 two ends is detected.In the time that voltage monitoring unit detects that the magnitude of voltage at current-limiting resistance R5 or R6 two ends exceedes setting threshold (the setting threshold here comprises max-thresholds and minimum threshold two parts); the current supply circuit of cutting system power supply; control system down circuitry, out of service, to realize failure protection function.
As the preferred embodiment of one, one on-off circuit can be set in the current supply circuit of system power supply, specifically the switch ways of on-off circuit can be connected in the current supply circuit of system power supply to the control signal of control end receiver voltage monitoring means output.In the time that voltage monitoring unit detects that the magnitude of voltage at current-limiting resistance R5 or R6 two ends exceedes setting threshold; output effectively controls signal to the control end of on-off circuit; the switch ways of gauge tap circuit disconnects; and then the current supply circuit of cutting system power supply, realize the height temperature failure protection function of circuit system.
The temperature indicator circuit of the present embodiment adopts triode to coordinate peripheral resistance to build mu balanced circuit, realizes the constant output of DC voltage, and circuit design is simple, with low cost, is easy to control.Adopt the thermistor of positive and negative two kinds of temperatures coefficient to coordinate the LED design display circuit of two kinds of different colours, realized the effect that three looks are indicated, by increasing colour contrast, further improved the sensitivity of indication.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also should belong to protection domain of the present utility model.
Claims (10)
1. a temperature indicator circuit, is characterized in that: comprise power supply, mu balanced circuit, LED and thermistor; Described power supply, by the DC voltage of mu balanced circuit stable output, exports the series arm of LED and thermistor to; In described mu balanced circuit, be provided with a NPN type triode, the collector of described triode connects power supply by the first resistance, and base stage connects power supply by the second resistance, and emitter is by the 3rd resistance eutral grounding; The resistance of described the first resistance, the second resistance and the 3rd resistance meets formula:
Wherein, R1, R2, R3 are respectively the resistance of the first resistance, the second resistance and the 3rd resistance, and the alternating current amplification coefficient that β is triode is constant; By the described DC voltage of collector output of described triode.
2. temperature indicator circuit according to claim 1, is characterized in that: the series arm of described LED and thermistor comprises many, after many series arm parallel connections, is connected between the DC voltage output end and ground of mu balanced circuit.
3. temperature indicator circuit according to claim 2, it is characterized in that: described series arm comprises two, article two, the glow color difference of the LED in series arm, and the thermistor that wherein thermistor in a series arm is positive temperature coefficient (PTC), the thermistor that the thermistor in another series arm is negative temperature coefficient.
4. temperature indicator circuit according to claim 3, is characterized in that: the resistance under normal temperature state of the thermistor described in two equates.
5. temperature indicator circuit according to claim 3, is characterized in that: in two described series arms, the pressure drop of two LEDs equates.
6. according to the temperature indicator circuit described in any one in claim 1 to 5, it is characterized in that: in the series arm described in each, be also in series with respectively current-limiting resistance.
7. temperature indicator circuit according to claim 6, is characterized in that: the resistance that is connected on each the current-limiting resistance in described series arm equates.
8. temperature indicator circuit according to claim 6, is characterized in that: in described temperature indicator circuit, is also provided with voltage monitoring unit, connects described current-limiting resistance, and by the voltage at detectability leakage resistance two ends, control system on/off.
9. temperature indicator circuit according to claim 8, is characterized in that: in the current supply circuit of described system power supply, be connected with on-off circuit, the control signal of described on-off circuit receiver voltage monitoring means output, carries out break-make control to described current supply circuit.
10. an electronic product, is characterized in that: be provided with the temperature indicator circuit as described in any one claim in claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320866288.1U CN203643030U (en) | 2013-12-26 | 2013-12-26 | Temperature indicating circuit and electronic products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320866288.1U CN203643030U (en) | 2013-12-26 | 2013-12-26 | Temperature indicating circuit and electronic products |
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| Publication Number | Publication Date |
|---|---|
| CN203643030U true CN203643030U (en) | 2014-06-11 |
Family
ID=50874265
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320866288.1U Withdrawn - After Issue CN203643030U (en) | 2013-12-26 | 2013-12-26 | Temperature indicating circuit and electronic products |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203643030U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698027A (en) * | 2013-12-26 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Temperature indication circuit and electronic product |
-
2013
- 2013-12-26 CN CN201320866288.1U patent/CN203643030U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698027A (en) * | 2013-12-26 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Temperature indication circuit and electronic product |
| CN103698027B (en) * | 2013-12-26 | 2016-01-06 | 青岛歌尔声学科技有限公司 | A kind of temperature indicator circuit and electronic product |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140611 Effective date of abandoning: 20160106 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140611 Effective date of abandoning: 20160106 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |