CN203405744U - Low-temperature heating circuit for outdoor wireless access point - Google Patents
Low-temperature heating circuit for outdoor wireless access point Download PDFInfo
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- CN203405744U CN203405744U CN201320493816.3U CN201320493816U CN203405744U CN 203405744 U CN203405744 U CN 203405744U CN 201320493816 U CN201320493816 U CN 201320493816U CN 203405744 U CN203405744 U CN 203405744U
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Abstract
The utility model discloses a low-temperature heating circuit for an outdoor wireless access point, which comprises a temperature sensor used for measuring the ambient temperature, a voltage signal amplifying circuit used for amplifying the signals of the temperature sensor, a hysteresis comparison circuit used for judging and comparing a temperature value measured by the temperature sensor with a preset temperature value, a heater and a heater ON-OFF control circuit used for driving the heater to run. The output end of the temperature sensor is connected with the input end of the voltage signal amplifying circuit. The output end of the voltage signal amplifying circuit is connected with the input end of the hysteresis comparison circuit. The output end of the hysteresis comparison circuit is connected with the heater ON-OFF control circuit. The output end of the heater ON-OFF control circuit is connected with the heater. According to the embodiments of the utility model, the low-temperature heating circuit can be automatically started in an outdoor subzero low-temperature environment. Therefore, the outdoor wireless access point is ensured to work stably in the low-temperature environment.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of low-temperature heating device for outdoor wireless access point.
Background technology
Outdoor wireless access point is current a kind of equipment that is widely used in wireless network, because outdoor wireless access point is operated under outdoor environment, so will face various weather conditions, for example temperature likely reaches-30 ℃, or even-40 ℃, and the working temperature of conventional business level element all must be more than 0 ℃ at present, as CPU, SDRAM, network chip PHY etc., when so outdoor wireless access point is worked under the environment of low temperature, will be because outdoor environment temperature causes compared with low that product work is unstable maybe cannot work, What is more can make the master chip of product damage.If cost is higher to select the chip of technical grade or army grade, and some may not buy the chip of technical grade, the time of delivery of more crucial price Gao Qie manufacturer also can be long, will have a strong impact on like this release and the batch production of a new product.
Summary of the invention
The technical matters that the utility model solves is to provide a kind of low-temperature heat circuit that is applied in outdoor electronic product, to guarantee in outdoor sub-zero low temperature environment, can automatically start heater circuit, further make the outdoor wireless access point can be at steady operation under low temperature environment.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
The low-temperature heat circuit of outdoor wireless access point, comprise the temperature sensor for measures ambient temperature, for the voltage signal amplifying circuit that temperature sensor signal is amplified, for the temperature value of temperature sensor side and design temperature are judged to hysteresis comparator circuit relatively, well heater and for driving well heater to carry out the heater button control circuit of work, the output terminal of described temperature sensor connects the input end of voltage signal amplifying circuit, the output terminal of voltage signal amplifying circuit connects the input end of hysteresis comparator circuit, the output terminal of hysteresis comparator circuit connects heater button control circuit, the output terminal of heater button control circuit connects well heater.
Improvement of the present utility model is: the output terminal of described voltage signal amplifying circuit is also connected with cold start-up protection control circuit, between cold start-up protection control circuit and voltage signal amplifying circuit, is connected in series with thresholding comparator circuit; The output terminal of cold start-up protection control circuit connects the Master control chip of outdoor wireless access point.
Owing to having adopted above technical scheme, the obtained technical progress of the utility model is as follows.
The utility model circuit structure is simple, cheap, can be applicable in the exterior product such as outdoor wireless access point, wireless bridge or wireless point-to-point communication unit, make exterior product without using expensive technical grade chip, can make product lower than design temperature in the situation that, automatically start heater circuit, guarantee that product can work under the very low environment of temperature, improve safety and the reliability of product, also expanded the applicability of product simultaneously, can use in more region.Especially coordinate the cold start-up defencive function of this circuit to make product more reliable and more stable, greatly reduce the production cost of product simultaneously.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further elaborated.
A kind of low-temperature heat circuit of outdoor wireless access point, its structured flowchart as shown in Figure 1, comprises temperature sensor, voltage signal amplifying circuit, hysteresis comparator circuit, heater button control circuit, well heater and thresholding comparator circuit and cold start-up protection control circuit; Wherein temperature sensor, voltage signal amplifying circuit, hysteresis comparator circuit, heater button control circuit, well heater are connected in series successively; the output terminal of voltage signal amplifying circuit is connected with cold start-up protection control circuit through thresholding comparator circuit, and the output terminal of cold start-up protection control circuit connects the Master control chip of outdoor wireless access point.
In the present embodiment, the physical circuit schematic diagram of the low-temperature heat circuit of outdoor wireless access point as shown in Figure 2.
Temperature sensor U16 adopts the LM50C of TI, and this chip is high precision integrated temperature sensing chip, can under the temperature conditions of-40 ℃ ~+125 ℃, work, and the output voltage of its detecting and the pass of temperature are: Vout=(10mV/ ℃+Temp ℃)+500mV.Temperature sensor is for measuring the environment temperature of outdoor wireless access point work, and changes temperature signal into corresponding voltage signal and be transferred to voltage signal amplifying circuit.
Voltage signal amplifying circuit is comprised of C265, R159, R168, R152, C262, U15A and C264, after the voltage signal of temperature sensor transmission is amplified to processing, is transferred to hysteresis comparator circuit.
Hysteresis comparator circuit is comprised of R169, R160, U15B, R147, R148, C297, for the temperature value of temperature sensor side and design temperature are judged relatively, to determine whether to start heater button control circuit.Its principle of work is by R160, to set the voltage overturn point of this hysteresis comparator circuit, and, when lower than 9.25 ℃, the action of control heater ON-OFF control circuit, further opens well heater, and product is heated; When temperature is elevated to 28.25 ℃, hysteresis comparator output voltage upset, will turn-off well heater, stops heating, and product temperature is controlled in the temperature range of 9.25 ℃ ~ 28.25 ℃, and this is also a more suitable temperature of product work.
Heater button control circuit mainly consists of Q14, Q13, Q12, and after triggering and conducting, control heater heats successively.After well heater heating, for improving the environment temperature of outdoor wireless access point work, guarantee that each element can work, improve the job stability of product.
Thresholding comparator circuit is mainly comprised of R166, R164, R167, U15D, C321 etc.; cold start-up protection control circuit is mainly comprised of R165 and Q15. when wherein R167 is set in lower than the environment of-10 ℃; export a low level signal to the Master control chip of outdoor wireless access point; with prevent Master control chip maloperation and or program fleet; thereby starting protection product, makes the product also can steady operation under low temperature environment.When well heater is heated to product temperature higher than-10 ℃, thresholding comparator circuit will be removed rapidly this control signal, is about to this signal voltage and is pulled to high level, makes product stable starting working rapidly.
Claims (2)
1. the low-temperature heat circuit of outdoor wireless access point, it is characterized in that: comprise the temperature sensor for measures ambient temperature, for the voltage signal amplifying circuit that temperature sensor signal is amplified, for the temperature value of temperature sensor side and design temperature are judged to hysteresis comparator circuit relatively, well heater and for driving well heater to carry out the heater button control circuit of work, the output terminal of described temperature sensor connects the input end of voltage signal amplifying circuit, the output terminal of voltage signal amplifying circuit connects the input end of hysteresis comparator circuit, the output terminal of hysteresis comparator circuit connects heater button control circuit, the output terminal of heater button control circuit connects well heater.
2. the low-temperature heat circuit of outdoor wireless access point according to claim 1, it is characterized in that: the output terminal of described voltage signal amplifying circuit is also connected with cold start-up protection control circuit, between cold start-up protection control circuit and voltage signal amplifying circuit, is connected in series with thresholding comparator circuit; The output terminal of cold start-up protection control circuit connects the Master control chip of outdoor wireless access point.
Priority Applications (1)
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CN201320493816.3U CN203405744U (en) | 2013-08-14 | 2013-08-14 | Low-temperature heating circuit for outdoor wireless access point |
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CN201320493816.3U CN203405744U (en) | 2013-08-14 | 2013-08-14 | Low-temperature heating circuit for outdoor wireless access point |
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CN201320493816.3U Expired - Fee Related CN203405744U (en) | 2013-08-14 | 2013-08-14 | Low-temperature heating circuit for outdoor wireless access point |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105228412A (en) * | 2015-08-24 | 2016-01-06 | 中磊电子(苏州)有限公司 | Heater |
CN105223989A (en) * | 2015-09-29 | 2016-01-06 | 贵州剑星科技有限公司 | A kind of constant-temperature heating system of adjustable temperature |
CN106484002A (en) * | 2015-08-27 | 2017-03-08 | 北京谊安医疗系统股份有限公司 | A kind of anaesthesia machine loop heats automatic thermostatic controller |
CN111258354A (en) * | 2020-01-21 | 2020-06-09 | Oppo广东移动通信有限公司 | Network device |
CN113448360A (en) * | 2020-03-26 | 2021-09-28 | 中磊电子(苏州)有限公司 | Network device with temp. control switch, heater, latch and power supply circuit |
-
2013
- 2013-08-14 CN CN201320493816.3U patent/CN203405744U/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105228412A (en) * | 2015-08-24 | 2016-01-06 | 中磊电子(苏州)有限公司 | Heater |
US9791173B2 (en) | 2015-08-24 | 2017-10-17 | Sercomm Corporation | Heating device having heating transistor unit |
CN105228412B (en) * | 2015-08-24 | 2018-09-14 | 中磊电子(苏州)有限公司 | Heating device |
CN106484002A (en) * | 2015-08-27 | 2017-03-08 | 北京谊安医疗系统股份有限公司 | A kind of anaesthesia machine loop heats automatic thermostatic controller |
CN105223989A (en) * | 2015-09-29 | 2016-01-06 | 贵州剑星科技有限公司 | A kind of constant-temperature heating system of adjustable temperature |
CN111258354A (en) * | 2020-01-21 | 2020-06-09 | Oppo广东移动通信有限公司 | Network device |
CN111258354B (en) * | 2020-01-21 | 2022-01-11 | Oppo广东移动通信有限公司 | Network device |
CN113448360A (en) * | 2020-03-26 | 2021-09-28 | 中磊电子(苏州)有限公司 | Network device with temp. control switch, heater, latch and power supply circuit |
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Legal Events
Date | Code | Title | Description |
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C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 Termination date: 20160814 |