CN101963817B - Constant-temperature heating system - Google Patents
Constant-temperature heating system Download PDFInfo
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- CN101963817B CN101963817B CN200910304583A CN200910304583A CN101963817B CN 101963817 B CN101963817 B CN 101963817B CN 200910304583 A CN200910304583 A CN 200910304583A CN 200910304583 A CN200910304583 A CN 200910304583A CN 101963817 B CN101963817 B CN 101963817B
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- thermistor
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- mos pipe
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Abstract
The invention discloses a constant-temperature heating system for heating the keyboards of electronic apparatuses, comprising a power supply, a control circuit, a heating device and a feedback circuit, wherein the control circuit is electrically connected with the power supply; the heating device is electrically connected with the control circuit; and the feedback circuit is electrically connected with the control circuit and comprises a temperature sensing device which is electrically connected with the feedback circuit and connected with the heating device through a temperature sensing lead. The constant-temperature heating system provided by the invention can precisely control the temperature in a predetermined temperature, and is stable and not easy to be damaged.
Description
[technical field]
The present invention relates to a kind of heating system, particularly about a kind of heated at constant temperature system.
[background technology]
In the prior art; People are the heating system keyboard of packing into, and purpose is in order to make keyboard band heating function, make the people can freezing both hands when using keyboard the winter of cold; For example People's Republic of China's patent publication No. is the disclosed a kind of warm hand keyboard of CN201107731; Its technical characterictic is: the internal edge at keyboard is equipped with heating resistor and CS, and CS is connected with slide rheostat through power supply, connects through heat-conducting metal between heating resistor and the slide rheostat.Its dividing potential drop through slide rheostat is controlled the voltage of heating resistor, thereby changes the temperature of heating resistor.
Yet the shortcoming of above-mentioned warm hand keyboard is that 1. the temperature of heating resistor can not accurately be controlled; 2. said heating system is stable inadequately, damages easily.
[summary of the invention]
The object of the present invention is to provide a kind of heating system, can not accurately control and the heating system problem of unstable to solve the heating system temperature.
For achieving the above object, the present invention provides a kind of heated at constant temperature system, and it is used for the keyboard heating to electronic equipment, and it comprises:
A power supply;
A control circuit, itself and above-mentioned power supply electrically connect;
A heating arrangement, itself and above-mentioned control circuit electrically connect;
A feedback circuit, itself and above-mentioned control circuit electrically connect, and this feedback circuit comprises a temperature sensing device, and it is connected through a TEMP lead with above-mentioned feedback circuit electric connection and with above-mentioned heating arrangement.
Thus; In above-mentioned feedback circuit, set a predetermined temperature; When above-mentioned heating arrangement temperature was lower than this predetermined temperature, the said temperature sensing device was passed to above-mentioned feedback circuit with a temperature signal, and above-mentioned feedback circuit is passed to above-mentioned control circuit through analyzing and processing with an enabling signal; Above-mentioned control circuit is opened above-mentioned heating arrangement after receiving enabling signal, and above-mentioned heating arrangement is started working;
When above-mentioned heating arrangement temperature is higher than this predetermined temperature; The said temperature sensing device is passed to above-mentioned feedback circuit with a temperature signal; Above-mentioned feedback circuit is passed to above-mentioned control circuit through analyzing and processing with a shutdown signal; Above-mentioned control circuit cuts out above-mentioned heating arrangement after receiving shutdown signal, above-mentioned heater stop work.
Compared to prior art, heated at constant temperature provided by the present invention system, it can accurately be controlled at temperature in the predetermined temperature, and the Wen Ding of this heated at constant temperature system, is not easy to damage.
[description of drawings]
Fig. 1 is the functional-block diagram of heated at constant temperature of the present invention system.
Fig. 2 is the circuit component figure of heated at constant temperature of the present invention system.
[embodiment]
The present invention provides a kind of heated at constant temperature system; It is used for keyboard heating, and it is located on the mainboard of computer, sees also shown in the circuit component figure of functional-block diagram and Fig. 2 heated at constant temperature of the present invention system of Fig. 1 heated at constant temperature of the present invention system; In present embodiment, this heated at constant temperature system comprises:
A power supply 1, its voltage are 12～19V;
A control circuit 2 comprises a switch SW 1, and it is through one the 5th resistance R 5 and above-mentioned power supply 1 polyphone; One and a door D1, an interface of its input end and above-mentioned switch SW 1 polyphone; A N-MOS pipe Q9 (N type FET); Its grid and above-mentioned and door D1 output terminal polyphone; Its source ground, one the 3rd resistance R 3 are connected between the grid of above-mentioned and door D1 output terminal and N-MOS pipe Q9, and one second resistance R 2 is connected with another interface of the input end of above-mentioned and a D1; And above-mentioned the 3rd resistance R 3 is connected with above-mentioned power supply 1 through one the 6th resistance R 6 with above-mentioned second resistance R 2, and its purpose is above-mentionedly to manage Q9 with door D1 and N-MOS a WV is provided; A P-MOS pipe Q10 (P type FET), the drain electrode polyphone of its grid and above-mentioned N-MOS pipe Q9; One the 4th resistance R 4, it is connected between the source electrode and grid of above-mentioned P-MOS pipe Q10, and the grid of above-mentioned P-MOS pipe Q10 is connected with above-mentioned power supply 1 with an inductance L 1 through a fuse F1 with source electrode;
A heating arrangement 3, this heating arrangement 2 is a resistance wire R, it is connected between the drain electrode and ground of above-mentioned P-MOS pipe Q10;
A feedback circuit 4 comprises one first resistance R 1; One temperature sensing device 40, this temperature sensing device 40 is a thermistor RT, this thermistor RT and above-mentioned first resistance R, 1 polyphone; A potentiometer RP, itself and above-mentioned first resistance R 1, thermistor RT polyphone, and described first resistance R 1, thermistor RT, potentiometer RP one end are connected other end ground connection through one the 7th resistance R 7 with above-mentioned power supply 1; A NE555 integrated circuit; Its trigger end is connected between above-mentioned first resistance R 1 and the thermistor RT; This NE555 integrated circuit and above-mentioned first resistance R 1, thermistor RT, potentiometer RP form a steady-state circuit, and its output terminal is connected with another interface of the input end of above-mentioned and door D1.
Its principle of work does, above-mentioned switch SW 1 connects power supply 1 back circuit and starts working, and through above-mentioned potentiometer RP the controlling temperature that rises of circuit is set in 30 ℃; When the temperature of above-mentioned heating arrangement was lower than 30 ℃, above-mentioned thermistor RT resistance reduced, through the dividing potential drop of first resistance R 1 with thermistor RT and potentiometer RP; Make the voltage of trigger end of NE555 integrated circuit be lower than 5V/3; So above-mentioned steady-state circuit is triggered, the output terminal of above-mentioned NE555 integrated circuit output high level, two interfaces of the input end of above-mentioned and door D1 all are high level; Should also export high level with the output terminal of door D1, because the grid of above-mentioned N-MOS pipe Q9 and the voltage V between the source electrode
GSCut-in voltage greater than this N-MOS pipe Q9 is switched on so this N-MOS manages source electrode and the drain electrode of Q9, thereby makes above-mentioned P-MOS manage the grounded-grid of Q10, the grid of this P-MOS pipe Q10 and the voltage V between the source electrode
GSFor-19V～-12V is less than the cut-in voltage of this P-MOS pipe Q10, thereby make the source electrode and drain electrode conducting of above-mentioned P-MOS pipe Q10, above-mentioned heating arrangement 3 is started working;
When the temperature of above-mentioned heating arrangement 3 is higher than 30 ℃; Above-mentioned thermistor RT resistance raises; Through the dividing potential drop of first resistance R 1, make the voltage of trigger end of NE555 integrated circuit be higher than 5V/3, so above-mentioned steady-state circuit is in stable state with thermistor RT and potentiometer RP; The output terminal output low level of above-mentioned NE555 integrated circuit; Above-mentioned two interfaces of input end with door D1 are respectively low level of a high level, should with the output terminal output low level of door D1 because the grid of above-mentioned N-MOS pipe Q0 and the voltage V between the source electrode
GSLess than the cut-in voltage of this N-MOS pipe Q9,, break off with drain electrode thereby above-mentioned P-MOS manages the source electrode of Q10, thereby above-mentioned heating arrangement 3 quits work so source electrode and the drain electrode of this N-MOS pipe Q9 are disconnected.
Compared to prior art, heated at constant temperature provided by the present invention system, it can accurately be controlled at temperature in the predetermined temperature, and the Wen Ding of this heated at constant temperature system, is not easy to damage.
Claims (4)
1. heated at constant temperature system, the keyboard heating that it is used for to electronic equipment is characterized in that it comprises:
A power supply;
A control circuit, itself and above-mentioned power supply electrically connect; Described control circuit comprises a switch, and it is through one the 5th resistance and above-mentioned power supply polyphone; One and door, an interface of its input end and above-mentioned switch polyphone; A N-MOS pipe, its grid and above-mentioned and gate output terminal polyphone, its source ground; One the 3rd resistance is connected between the grid of above-mentioned and gate output terminal and N-MOS pipe; One second resistance is connected with another interface of the input end of above-mentioned and door; And above-mentioned the 3rd resistance is connected with above-mentioned power supply through one the 6th resistance with above-mentioned second resistance, and its purpose is that above-mentioned the pipe with N-MOS with door provides a WV; A P-MOS pipe, the drain electrode polyphone of its grid and above-mentioned N-MOS pipe; One the 4th resistance, it is connected between the source electrode and grid of above-mentioned P-MOS pipe, and the grid of above-mentioned P-MOS pipe is connected with above-mentioned power supply with an inductance through a fuse with source electrode;
A heating arrangement, itself and above-mentioned control circuit electrically connect;
A feedback circuit, itself and above-mentioned control circuit electrically connect, and this feedback circuit comprises a temperature sensing device, and it is connected through a TEMP lead with above-mentioned feedback circuit electric connection and with above-mentioned heating arrangement.
2. heated at constant temperature according to claim 1 system is characterized in that described heating arrangement is a resistance wire, and it is connected between the drain electrode and ground of above-mentioned P-MOS pipe.
3. heated at constant temperature according to claim 1 system is characterized in that described temperature sensing device is a thermistor.
4. heated at constant temperature according to claim 1 system is characterized in that described feedback circuit comprises one first resistance; One temperature sensing device, this temperature sensing device are a thermistor, this thermistor and above-mentioned first resistance polyphone; A potentiometer, itself and above-mentioned first resistance, thermistor polyphone, and described first resistance, thermistor, potentiometer one end are connected other end ground connection through one the 7th resistance with above-mentioned power supply; A NE555 integrated circuit; Its trigger end is connected between above-mentioned first resistance and the thermistor; This NE555 integrated circuit and above-mentioned first resistance, thermistor, potentiometer are formed a steady-state circuit, and its output terminal with above-mentioned with another interface of input end be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910304583A CN101963817B (en) | 2009-07-21 | 2009-07-21 | Constant-temperature heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910304583A CN101963817B (en) | 2009-07-21 | 2009-07-21 | Constant-temperature heating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101963817A CN101963817A (en) | 2011-02-02 |
| CN101963817B true CN101963817B (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910304583A Expired - Fee Related CN101963817B (en) | 2009-07-21 | 2009-07-21 | Constant-temperature heating system |
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| Country | Link |
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| CN (1) | CN101963817B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243502B (en) * | 2011-03-22 | 2013-10-02 | 北京时代民芯科技有限公司 | Temperature control system and method for performing single event effect test under same |
| CN103279154B (en) * | 2013-06-17 | 2016-03-09 | 尚诚德 | A kind of intelligent temperature control circuit |
| FR3043805B1 (en) * | 2015-11-17 | 2021-12-24 | Ermes | SYSTEM FOR CONTROLLING A REGENERATION TEMPERATURE OF AN ELECTRONIC DEVICE PLACED IN AN IONIZING ATMOSPHERE. |
| CN109197747A (en) * | 2017-07-03 | 2019-01-15 | 广元公正科技有限公司 | The equipment that cold place bummaree heats the water in fishpond |
| CN113566977A (en) * | 2020-04-29 | 2021-10-29 | 南京宝地梅山产城发展有限公司 | Constant temperature protection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2047091U (en) * | 1987-10-10 | 1989-11-08 | 杨谊胜 | Small incubator with constant temp. |
| CN2430280Y (en) * | 2000-06-16 | 2001-05-16 | 刘旭 | Exothermic keyboard |
| CN101147655A (en) * | 2007-11-13 | 2008-03-26 | 尤源 | Electric heating constant temperature foot washing device |
| CN201477527U (en) * | 2009-07-20 | 2010-05-19 | 神讯电脑(昆山)有限公司 | Constant-temperature heating system |
-
2009
- 2009-07-21 CN CN200910304583A patent/CN101963817B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2047091U (en) * | 1987-10-10 | 1989-11-08 | 杨谊胜 | Small incubator with constant temp. |
| CN2430280Y (en) * | 2000-06-16 | 2001-05-16 | 刘旭 | Exothermic keyboard |
| CN101147655A (en) * | 2007-11-13 | 2008-03-26 | 尤源 | Electric heating constant temperature foot washing device |
| CN201477527U (en) * | 2009-07-20 | 2010-05-19 | 神讯电脑(昆山)有限公司 | Constant-temperature heating system |
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| Publication number | Publication date |
|---|---|
| CN101963817A (en) | 2011-02-02 |
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