CN203705087U - High temperature alarm circuit - Google Patents
High temperature alarm circuit Download PDFInfo
- Publication number
- CN203705087U CN203705087U CN201420006124.6U CN201420006124U CN203705087U CN 203705087 U CN203705087 U CN 203705087U CN 201420006124 U CN201420006124 U CN 201420006124U CN 203705087 U CN203705087 U CN 203705087U
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- China
- Prior art keywords
- high temperature
- pin
- temperature
- resistance
- temperature alarm
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- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
A high temperature alarm circuit comprises a temperature sensor, an amplifier, a comparator and a high temperature alarm threshold voltage circuit, wherein the output end of the temperature sensor is connected with the input end of the amplifier LMV342ID, and is connected with a pin IN+ of the comparator LM339A via the output end of the amplifier LMV342ID, the high temperature alarm threshold voltage circuit is connected with a pin IN- of the comparator LM339A, and the output end of the comparator LM339A transmits a level signal HIGH_NTC to a trigger 74HCT74. According to the utility model, the temperature sensor is used to collect the operating temperature, the comparator is used to set a range, the operating temperature is compared with the set value in real time, and when the temperature is too high, the comparator transmits the level signal to the trigger to raise the alarm; and thus, and high temperature alarm protection is provided for a laser, and the laser is avoided from too high temperature and damage.
Description
[technical field]
The utility model relates to laser instrument, relates in particular to temperature protection and the control circuit of laser instrument.
[background technology]
In the use procedure of laser instrument, temperature variation can cause the great changes of its Output optical power.Therefore detect of crucial importance to the overtemperature alarm of laser instrument inside.
The temperature system of modern common laser instrument only carries out the collection of temperature, does not carry out high temperature alarm protection.If the excess Temperature of laser instrument; will produce very large infringement to laser device and do not carry out alarm and protection; also can have a huge impact the output of laser instrument simultaneously; so in the urgent need to there being the excess Temperature alarm protecting apparatus that is adapted to laser instrument, realize laser instrument high temperature alarm protected.
[summary of the invention]
The utility model has proposed a kind of high temperature alarm circuit that adapts to laser temperature for above problem, in the time that the temperature of laser instrument exceedes preset temperature, carries out alarm, avoids damaging laser instrument.
The related high temperature alarm circuit of the utility model comprises temperature sensor, amplifier, comparer and high temperature alarm threshold voltage circuit, wherein the output terminal of temperature sensor is connected to the input end of amplifier LMV342ID (U29), and be connected to the IN+ pin of comparer LM339A (U2) by the output terminal of amplifier LMV342ID (U29), and high temperature alarm threshold voltage circuit is connected with the IN-pin of comparer LM339A (U2); Comparer LM339A(U2D) output pin (PIN13) carry level signal to alert trigger 74HCT74(U1B).
This high temperature alarm threshold voltage circuit comprises resistance R 12, resistance R 13, adjustable resistance R14 and resistance R 3, form series connection bleeder circuit by resistance R 12, resistance R 13 and adjustable resistance R14, then pass through resistance R 3 current limlitings and be connected with the IN-pin of comparer LM339A (U2).
Level signal HIGH_NTC exports the 13rd pin of trigger 74HCT74 (U1) to, the 10th pin reset signal RST_FAULT_EN taking alarm of trigger 74HCT74, and the 8th pin of trigger 74HCT74 and the 9th pin be output alarm signal respectively.
The utility model adopts temperature sensor collecting work temperature, and set a codomain by comparer, compare in real time the size between working temperature and setting value, when there is the situation of excess Temperature, just report to the police to trigger by comparer transmission level signal; Laser instrument is carried out to high temperature alarm protection, avoid the excess Temperature of laser instrument, avoid damaging laser instrument.
The temperature system of modern common laser instrument only carries out the collection of temperature, does not carry out high temperature alarm protection.If the excess Temperature of laser instrument; will produce very large infringement to laser device and do not carry out alarm and protection; also can have a huge impact the output of laser instrument simultaneously; so in the urgent need to there being the excess Temperature alarm protecting apparatus that is adapted to laser instrument, realize laser instrument high temperature alarm protected.
[accompanying drawing explanation]
Fig. 1 is high temperature signal sample circuit of the present utility model
Fig. 2 is high temperature alarm circuit of the present utility model
[embodiment]
Below in conjunction with drawings and Examples, the utility model high temperature alarm circuit is elaborated.
Please refer to accompanying drawing 1, wherein show high temperature signal sample circuit schematic diagram, this high temperature alarm circuit comprises temperature sensor, amplifier, comparer and high temperature alarm threshold voltage circuit, wherein the output terminal of temperature sensor is connected to the input end of amplifier LMV342ID (U29), this temperature sensor gathers the temperature of laser instrument, and transmission of signal is to the input end of amplifier.There is from the temperature voltage signal Temp_Feed of temperature sensor input the characteristic declining with the rising of temperature.
Temperature voltage signal Temp Feed passes through amplifier LMV342ID (U29) after amplifying, be connected to the IN+ pin of comparer LM339A (U2) by the output terminal of amplifier LMV342ID (U29), and high temperature alarm threshold voltage circuit is connected with the IN-pin of comparer LM339A (U2).Comparer, by reduced temperature voltage signal and high temperature alarm threshold voltage, is then made a response.
The generation circuit of this high temperature alarm threshold voltage is by resistance R 12, R13, and R3 and adjustable resistance R14 composition, regulate the resistance of adjustable resistance R14 can regulate the size of high temperature alarm threshold voltage.Laser temperature is when lower than alarming threshold value, output pin (PIN13) the output high level HIGH_NTC of comparer LM339A (U2), but when laser temperature is during higher than alarming threshold value, temperature voltage signal Temp-Feed causes the output pin (PIN13) of comparer LM339A (U2) will export a low level signal HIGH_NTC lower than high-temperature valve threshold voltage.
Comparer LM339A(U2D) output pin (PIN13) carry level signal to alert trigger 74HCT74(U1B).
Level signal HIGH_NTC is input in trigger 74HCT74 (U1).When laser temperature during lower than high temperature threshold values circuit do not report to the police, now LED RED (D2) is not luminous.When laser temperature circuit alarm during higher than high temperature threshold values, now LED RED (D2) sends ruddiness and reports to the police, trigger output two-way alerting signal level HIGH_ALM_IN and HIGH_ALM_LED.When RST_FAULT_EN provides after a low level reset pulse, can cancel circuit alarm state.
The above, it is only the utility model preferred embodiment, not the utility model is done to any pro forma restriction, although the utility model discloses as above with preferred embodiment, but not in order to limit the utility model, any those skilled in the art, do not departing within the scope of technical solutions of the utility model, when utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be not depart from technical solutions of the utility model content, refer to any simple modification that above embodiment is done according to the utility model technology, equivalent variations and modification, all belong in the scope of technical solutions of the utility model.
Claims (3)
1. a high temperature alarm circuit, it is characterized in that, this high temperature alarm circuit comprises temperature sensor, amplifier, comparer and high temperature alarm threshold voltage circuit, wherein the output terminal of temperature sensor is connected to the input end of amplifier LMV342ID, and be connected to the IN+ pin of comparer LM339A by the output terminal of amplifier LMV342ID, and high temperature alarm threshold voltage circuit is connected with the IN-pin of comparer LM339A; The output pin of comparer LM339A carries level signal HIGH_NTC to alert trigger 74HCT74.
2. high temperature alarm circuit according to claim 1, it is characterized in that, this high temperature alarm threshold voltage circuit comprises resistance R 12, resistance R 13, adjustable resistance R14 and resistance R 3, form series connection bleeder circuit by resistance R 12, resistance R 13 and adjustable resistance R14, then be connected with the IN-pin of comparer LM339A through resistance R 3 current limlitings.
3. high temperature alarm circuit according to claim 1, it is characterized in that, level signal HIGH_NTC exports the 13rd pin of trigger 74HCT74 to, the 10th pin reset signal RST_FAULT_EN taking alarm of trigger 74HCT74, the 8th pin of trigger 74HCT74 and the 9th pin be output alarm signal respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420006124.6U CN203705087U (en) | 2014-01-06 | 2014-01-06 | High temperature alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420006124.6U CN203705087U (en) | 2014-01-06 | 2014-01-06 | High temperature alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203705087U true CN203705087U (en) | 2014-07-09 |
Family
ID=51055509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420006124.6U Expired - Lifetime CN203705087U (en) | 2014-01-06 | 2014-01-06 | High temperature alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203705087U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402078A (en) * | 2017-08-04 | 2017-11-28 | 昆山帝森克罗德光电技术有限公司 | A kind of three road temperature collection circuits for SVG products |
-
2014
- 2014-01-06 CN CN201420006124.6U patent/CN203705087U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402078A (en) * | 2017-08-04 | 2017-11-28 | 昆山帝森克罗德光电技术有限公司 | A kind of three road temperature collection circuits for SVG products |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170125 Address after: 518000 Guangdong city of Shenzhen province Nanshan District Guangdong streets Industrial Zone Maqueling building 10 (M-10 high tech Zone Central) 2, No. 3 203-C District Patentee after: SHENZHEN RFH LASER TECHNOLOGY Co.,Ltd. Address before: 518000 Guangdong City, Nanshan District Province, industrial zone, sparrow sparrow (high tech Zone, central M-10), floor 2, building 2, 203-B District, Patentee before: Shenzhen Ruifengheng Technology Development Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140709 |