CN103595232A - A temperature protection circuit of an inverter - Google Patents
A temperature protection circuit of an inverter Download PDFInfo
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- CN103595232A CN103595232A CN201210288412.0A CN201210288412A CN103595232A CN 103595232 A CN103595232 A CN 103595232A CN 201210288412 A CN201210288412 A CN 201210288412A CN 103595232 A CN103595232 A CN 103595232A
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Abstract
The invention reveals a temperature protection circuit of an inverter. The inverter converts direct current at a system end into alternating current at a load end. The temperature protection circuit comprises a cold cathode fluorescent lamp driver, a transistor group, a resonance circuit, a connector, a diode group, a thermistor, a first resistor, a reverse-connection-preventing diode, and a second resistor. The cold cathode fluorescent lamp driver comprises an input signal pin, a reference voltage pin, a current detection pin, a first N-MOS driving pin, a second N-MOS driving pin, a first P-MOS driving pin, and a second P-MOS driving pin. The transistor group comprises a first N-MOS transistor, a second N-MOS transistor, a first P-MOS transistor, and a second P-MOS transistor. The resonance circuit comprises a transformer, a first capacitor, a second capacitor. The connector comprises a first pin and a second pin. The diode group comprises a first diode and a second diode. Under the circumstances that a large load is provided and that the transformer provides large power, the inverter does not damage elements because of over-temperature or overheating.
Description
[technical field]
The present invention relates to a kind of temperature protection circuit, particularly relate to a kind of temperature protection circuit of inverter.
[background technology]
The inverter (Inverter) of present liquid crystal display (LCD) is generally without temperature protection circuit.Yet, along with lcd screen size is increasing, for making screen keep certain brightness, by needs Inverter, provide the more high-power large scale screen that goes to support, be that Inverter will export larger electric current, just likely there is overheated or excess temperature in Inverter like this, causes components and parts to damage, Inverter lifetime.
In view of this, be necessary to develop in fact a kind of temperature protection circuit of inverter, to solve above-mentioned excess temperature problems of excessive heat.
[summary of the invention]
Therefore, the object of this invention is to provide a kind of temperature protection circuit of inverter, solved in response in the larger situation of load, while needing inverter that relatively high power is provided, inverter excess temperature or the overheated problem that causes components and parts to damage.
In order to achieve the above object, the temperature protection circuit of inverter provided by the invention, described inverter is converted to the direct current of system end the alternating current of load end, and described temperature protection circuit comprises:
Cold cathode ray tube driver, it has input signal pin, reference voltage pin, current detecting pin, a N-MOS driving pin, the 2nd N-MOS driving pin, a P-MOS driving pin, the 2nd P-MOS driving pin, and described input signal pin connects the input signal of described system end;
Transistor group, it comprises a N-MOS pipe, the 2nd N-MOS pipe, a P-MOS pipe, the 2nd P-MOS pipe, its grid sequentially meets respectively a described N-MOS and drives pin, the 2nd N-MOS to drive pin, a P-MOS to drive pin, the 2nd P-MOS to drive pin, the source ground of a described N-MOS pipe, the 2nd N-MOS pipe, the source electrode of a described P-MOS pipe, the 2nd P-MOS pipe connects the input signal of described system end;
Resonant circuit, it comprises transformer, the first electric capacity, the second electric capacity, described transformer first input end connects the drain electrode of a described N-MOS pipe, a P-MOS pipe, one end of the first electric capacity described in the second input termination of described transformer, one end of the second electric capacity described in the first output termination of described transformer, the second output head grounding of described transformer, the drain electrode of the 2nd N-MOS pipe, the 2nd P-MOS pipe described in another termination of described the first electric capacity;
Connector, it has the first pin and the second pin, and described the first pin connects the other end of described the second electric capacity, and described connector externally connects described load end;
Diode group, comprises the first diode and the second diode, the second pin described in described the first diode forward termination, reverse current detecting pin described in termination, described the second diode forward end ground connection, reverse the second pin described in termination;
Thermistor, reference voltage pin described in one termination;
The first resistance, the other end of thermistor described in one termination, the other end ground connection of described the first resistance;
The anti-diode of playing a reversed role, its forward end is connected between described thermistor and described the first resistance, oppositely current detecting pin described in termination;
The second resistance, current detecting pin described in one termination, other end ground connection.
Optionally, described load end is liquid crystal panel.
Optionally, described thermistor is negative temperature coefficient resister.
Optionally, described current detecting pin is negative feedback input, when described current detecting pin voltage becomes large, a described N-MOS drives pin, the 2nd N-MOS to drive pin, a P-MOS to drive pin, the 2nd P-MOS to drive the output current duty ratio of pin to diminish.
Optionally; the temperature protection circuit of described inverter has a default protection temperature; described the first resistance is to presetting protection temperature; the described anti-diode not conducting when described thermistor is less than described default protection temperature of playing a reversed role, the described anti-diode conducting when described thermistor is more than or equal to described default protection temperature of playing a reversed role.
Optionally, described default protection temperature is 85 ℃.
Compared to prior art, utilize the temperature protection circuit of inverter of the present invention, when temperature is greater than described default protection temperature, the described anti-diode current flow of playing a reversed role, the voltage at the first resistance two ends raises, the detected voltage of described current detecting pin raises, because described current detecting pin is negative feedback input, a described N-MOS drives pin, the 2nd N-MOS drives pin, the one P-MOS drives pin, the 2nd P-MOS drives the output current duty ratio of pin to diminish, thereby final output current diminishes, and then the temperature of inverter is reduced, to protect its components and parts.
[accompanying drawing explanation]
Fig. 1 illustrates the modular structure schematic diagram into the temperature protection circuit of inverter of the present invention.
Fig. 2 illustrates the circuit diagram into a preferred embodiment of the temperature protection circuit of inverter of the present invention.
[embodiment]
Please jointly consult Fig. 1, Fig. 2, it illustrates respectively the circuit diagram into a preferred embodiment of the temperature protection circuit of the modular structure schematic diagram of the temperature protection circuit of inverter of the present invention, inverter of the present invention.
In order to achieve the above object, the temperature protection circuit of inverter provided by the invention, described inverter 10 is converted to the direct current of system end 20 alternating current of load end 30, and described temperature protection circuit comprises:
Cold cathode ray tube (CCFL, Cold Cathode Fluorescent Lamp) driver 11, it has input signal pin 110, reference voltage pin 111(reference voltage for example for 5V), its initial voltage of current detecting pin 112(is for example 1.5V), a N-MOS drives pin 113, the 2nd N-MOS to drive pin 114, a P-MOS to drive pin 115, the 2nd P-MOS to drive pin 116, described input signal pin 110 connects the input signal of described system end 20;
The first resistance 17, the other end of thermistor 16 described in one termination, the other end ground connection of described the first resistance 17;
The anti-diode 18 of playing a reversed role, its forward end is connected to 17 of described thermistor 16 and described the first resistance, reverse current detecting pin 112 described in termination, thus the voltage that effectively prevents described current detecting pin 112 moves back to 17 of described thermistor 16 and described the first resistance;
The second resistance 19, current detecting pin 112 described in one termination, other end ground connection.
In the present embodiment, described load end 30 is liquid crystal panel.
In the present embodiment, described thermistor 16 is negative temperature coefficient resister.
In the present embodiment, described current detecting pin 112 is negative feedback input, when described current detecting pin 112 voltages become large, a described N-MOS drives pin 113, the 2nd N-MOS to drive pin 114, a P-MOS to drive pin 115, the 2nd P-MOS to drive the output current duty ratio of pin 116 to diminish.
In the present embodiment, the temperature protection circuit of described inverter has a default protection temperature (being for example 85 ℃ herein), 17 pairs of described the first resistance should be preset protection temperature, the described anti-diode 18 not conducting when described thermistor 16 is less than described default protection temperature of playing a reversed role (now the pressure reduction of the dividing potential drop of described the first resistance 17 and described current detecting pin 112 is less than the conducting voltage of the described anti-diode 18 of playing a reversed role), (now the resistance of described thermistor 16 reduces in described anti-diode 18 conducting when described thermistor 16 is more than or equal to described default protection temperature of playing a reversed role, the dividing potential drop of described the first resistance 17 increases, the pressure reduction of described current detecting pin 112 is more than or equal to the conducting voltage of the described anti-diode 18 of playing a reversed role).
To sum up, utilize the temperature protection circuit of inverter of the present invention, when described thermistor 16 temperature are greater than described default protection temperature, described anti-diode 18 conductings of playing a reversed role, the voltage at the first resistance 17 two ends raises, the detected voltage of described current detecting pin 112 raises, because described current detecting pin 112 is negative feedback input, a described N-MOS drives pin 113, the 2nd N-MOS drives pin 114, the one P-MOS drives pin 115, the 2nd P-MOS drives the output current duty ratio of pin 116 to diminish, thereby final output current diminishes, and then the temperature of inverter 10 is reduced, to protect its components and parts.
Claims (6)
1. a temperature protection circuit for inverter, described inverter is converted to the direct current of system end the alternating current of load end, it is characterized in that, and described temperature protection circuit comprises:
Cold cathode ray tube driver, it has input signal pin, reference voltage pin, current detecting pin, a N-MOS driving pin, the 2nd N-MOS driving pin, a P-MOS driving pin, the 2nd P-MOS driving pin, and described input signal pin connects the input signal of described system end;
Transistor group, it comprises a N-MOS pipe, the 2nd N-MOS pipe, a P-MOS pipe, the 2nd P-MOS pipe, its grid sequentially meets respectively a described N-MOS and drives pin, the 2nd N-MOS to drive pin, a P-MOS to drive pin, the 2nd P-MOS to drive pin, the source ground of a described N-MOS pipe, the 2nd N-MOS pipe, the source electrode of a described P-MOS pipe, the 2nd P-MOS pipe connects the input signal of described system end;
Resonant circuit, it comprises transformer, the first electric capacity, the second electric capacity, described transformer first input end connects the drain electrode of a described N-MOS pipe, a P-MOS pipe, one end of the first electric capacity described in the second input termination of described transformer, one end of the second electric capacity described in the first output termination of described transformer, the second output head grounding of described transformer, the drain electrode of the 2nd N-MOS pipe, the 2nd P-MOS pipe described in another termination of described the first electric capacity;
Connector, it has the first pin and the second pin, and described the first pin connects the other end of described the second electric capacity, and described connector externally connects described load end;
Diode group, comprises the first diode and the second diode, the second pin described in described the first diode forward termination, reverse current detecting pin described in termination, described the second diode forward end ground connection, reverse the second pin described in termination;
Thermistor, reference voltage pin described in one termination;
The first resistance, the other end of thermistor described in one termination, the other end ground connection of described the first resistance;
The anti-diode of playing a reversed role, its forward end is connected between described thermistor and described the first resistance, oppositely current detecting pin described in termination;
The second resistance, current detecting pin described in one termination, other end ground connection.
2. the temperature protection circuit of inverter as claimed in claim 1, is characterized in that, described load end is liquid crystal panel.
3. the temperature protection circuit of inverter as claimed in claim 1, is characterized in that, described thermistor is negative temperature coefficient resister.
4. the temperature protection circuit of inverter as claimed in claim 1; it is characterized in that; described current detecting pin is negative feedback input; when described current detecting pin voltage becomes large, a described N-MOS drives pin, the 2nd N-MOS to drive pin, a P-MOS to drive pin, the 2nd P-MOS to drive the output current duty ratio of pin to diminish.
5. the temperature protection circuit of inverter as claimed in claim 1, is characterized in that, the temperature protection circuit of described inverter has a default protection temperature, and described the first resistance is to presetting protection temperature.
6. the temperature protection circuit of inverter as claimed in claim 5, is characterized in that, described default protection temperature is 85 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210288412.0A CN103595232A (en) | 2012-08-14 | 2012-08-14 | A temperature protection circuit of an inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210288412.0A CN103595232A (en) | 2012-08-14 | 2012-08-14 | A temperature protection circuit of an inverter |
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| Publication Number | Publication Date |
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| CN103595232A true CN103595232A (en) | 2014-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210288412.0A Pending CN103595232A (en) | 2012-08-14 | 2012-08-14 | A temperature protection circuit of an inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111992847A (en) * | 2020-08-27 | 2020-11-27 | 上海沪工焊接集团股份有限公司 | Control method and device for wide-voltage multifunctional arc welding machine and storage medium thereof |
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| CN101162564A (en) * | 2006-10-13 | 2008-04-16 | 三星电子株式会社 | Driving device of backlight unit, liquid crystal display apparatus having the same, and control method thereof |
| CN101277570A (en) * | 2007-03-30 | 2008-10-01 | 索尼株式会社 | Fluorescent lamp driving method and apparatus |
| CN101568217A (en) * | 2009-05-25 | 2009-10-28 | 张文宏 | Lamp tube power supply structure |
| CN202798441U (en) * | 2012-08-14 | 2013-03-13 | 神讯电脑(昆山)有限公司 | Temperature protection circuit of inverter |
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2012
- 2012-08-14 CN CN201210288412.0A patent/CN103595232A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050078080A1 (en) * | 2003-08-11 | 2005-04-14 | Seock-Hwan Kang | Method and apparatus for controlling operation of lamps |
| CN101162564A (en) * | 2006-10-13 | 2008-04-16 | 三星电子株式会社 | Driving device of backlight unit, liquid crystal display apparatus having the same, and control method thereof |
| CN101277570A (en) * | 2007-03-30 | 2008-10-01 | 索尼株式会社 | Fluorescent lamp driving method and apparatus |
| CN101568217A (en) * | 2009-05-25 | 2009-10-28 | 张文宏 | Lamp tube power supply structure |
| CN202798441U (en) * | 2012-08-14 | 2013-03-13 | 神讯电脑(昆山)有限公司 | Temperature protection circuit of inverter |
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| 宁波中科集成电路设计中心: "高性能冷阴极荧光灯控制器—DF6109A", 《百度文库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992847A (en) * | 2020-08-27 | 2020-11-27 | 上海沪工焊接集团股份有限公司 | Control method and device for wide-voltage multifunctional arc welding machine and storage medium thereof |
| CN111992847B (en) * | 2020-08-27 | 2024-05-31 | 上海沪工焊接集团股份有限公司 | Control method and device for wide-voltage multifunctional arc welder and storage medium thereof |
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Application publication date: 20140219 |