CN202632133U - Temperature compensating circuit, liquid crystal screen and building intercommunication system - Google Patents
Temperature compensating circuit, liquid crystal screen and building intercommunication system Download PDFInfo
- Publication number
- CN202632133U CN202632133U CN 201220174237 CN201220174237U CN202632133U CN 202632133 U CN202632133 U CN 202632133U CN 201220174237 CN201220174237 CN 201220174237 CN 201220174237 U CN201220174237 U CN 201220174237U CN 202632133 U CN202632133 U CN 202632133U
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- temperature
- triode
- compensation circuit
- resistance
- liquid crystal
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Abstract
The utility model provides a temperature compensating circuit, a liquid crystal screen, and a building intercommunication system. The temperature compensating circuit comprises a temperature acquisition unit, a comparison amplification unit whose input terminal is connected with an output terminal of the temperature acquisition unit, a temperature compensating driver module whose input terminal is connected with an output terminal of the comparison amplification unit, and a temperature compensating unit which is connected with an output terminal of the temperature compensating driver module. The temperature compensating circuit acquires the environment temperature, controls the work of the temperature compensating unit according to the acquired environment temperature signals, and has the characteristics of simple structure, reliable performance and low cost.
Description
Technical field
The utility model relates to a kind of temperature-compensation circuit, liquid crystal display and building conversational system.
Background technology
Among the actual use of building talkback engineering, under low temperature environment, liquid crystal display (for example LCM display screen) can Yin Wendu cross low and cause the liquid crystal material motion of liquid crystal display slack-off, activity descends, thereby the phenomenon of breath screen appears.
The utility model content
The utility model provides a kind of temperature-compensation circuit, liquid crystal display and building conversational system, crosses the breath screen problem when low to solve the prior art environment temperature.
For addressing the above problem, first aspect as the utility model provides a kind of temperature-compensation circuit, comprising: temperature collecting cell; Compare amplifying unit, relatively the input end of amplifying unit is connected with the output terminal of temperature collecting cell; Mend warm driver module, relatively the output terminal of amplifying unit is connected with the input end of mending warm driver module; Mend warm unit, mend warm unit and be connected with the output terminal of mending warm driver module.
Further, temperature collecting cell comprises thermistor.
Further, relatively amplifying unit comprises first triode and first resistance that is used to set the warm threshold value of benefit, and the base stage of first triode is connected with an end of first resistance, the other end ground connection of first resistance; The output terminal of temperature collecting cell is connected with the base stage of first triode.
Further; Mend warm driver module and comprise second triode, second resistance and the 3rd resistance; The base stage of second triode is connected with the collector of first triode; The positive source of temperature-compensation circuit is connected with the collector of second triode through second resistance, and the positive source of temperature-compensation circuit is connected with the base stage of second triode through the 3rd resistance.
Further, mend the light emitting diode that warm unit comprises a plurality of series connection, the light emitting diode of a plurality of series connection is connected with the emitter of second triode.
Further, mend warm unit and also comprise the 4th resistance, the emitter of second triode is connected with the light emitting diode of a plurality of series connection through the 4th resistance.
Second aspect as the utility model provides a kind of liquid crystal display, comprises temperature-compensation circuit, and this temperature-compensation circuit is above-mentioned temperature-compensation circuit.
First aspect as the utility model provides a kind of building conversational system, comprises liquid crystal display, and this liquid crystal display is above-mentioned liquid crystal display.
The utility model is gathered environment temperature, and according to the work that warm unit is mended in the ambient temperature signal control that collects, and has simple in structure, dependable performance, characteristics that cost is low.
Description of drawings
Fig. 1 schematically shows the schematic diagram of wanting the temperature-compensation circuit in the utility model.
Embodiment
Embodiment to the utility model is elaborated below in conjunction with accompanying drawing, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
First aspect as the utility model provides a kind of temperature-compensation circuit, comprising: temperature collecting cell, comparison amplifying unit, the warm driver module of benefit and benefit temperature unit.Temperature collecting cell be used to sample environment temperature and be converted into current parameters and pass to the comparison amplifying unit.Relatively the input end of amplifying unit is connected with the output terminal of temperature collecting cell, mends circuit temperature the temperature signal that collects is amplified also to drive.Relatively the output terminal of amplifying unit is connected with the input end of mending warm driver module; Mending warm unit is connected with the output terminal of mending warm driver module.Mend warm driver module and be used for the control signal that amplifying unit relatively transmits is given to and mend warm unit, so mend wet unit according to producing corresponding heat, to realize the function of temperature compensation from the control signal of mending warm driver module.
Preferably, temperature collecting cell comprises thermistor RT, and further, thermistor RT is connected with the positive source of temperature-compensation circuit through resistance R 5, so that can be through the adjusting of resistance R 5 being adapted to the resistance characteristic of temperature-sensitive RT.
Preferably, relatively amplifying unit comprises that the first triode Q1 and the base stage that is used to set first resistance R, 1, the first triode Q1 that mends warm threshold value are connected the other end ground connection of first resistance R 1 with an end of first resistance R 1; The output terminal of temperature collecting cell is connected with the base stage of the first triode Q1.The size of wherein, regulating first resistance R 1 can select to mend the threshold values (promptly beginning compensation in how high temperature) of temperature.
Preferably; Mend warm driver module and comprise the second triode Q2, second resistance R 2 and the 3rd resistance R 3; The base stage of second triode is connected with the collector of the first triode Q1; The positive source of temperature-compensation circuit is connected with the collector of the second triode Q2 through second resistance R 2, and the positive source of temperature-compensation circuit is connected with the base stage of the second triode Q2 through the 3rd resistance R 3.
Preferably; Mend the light emitting diode that warm unit comprises a plurality of series connection, the light emitting diode D1 of a plurality of series connection, D2, D3 are connected with the emitter of the second triode Q2, like this when lumination of light emitting diode; Just can produce certain heat, to realize the function of temperature compensation.Further, mending the emitter that warm unit also comprises the 4th resistance R 4, the second triode Q2 is connected with the light emitting diode of a plurality of series connection through the 4th resistance R 4.Through regulating the 4th resistance R 4, can regulate penalty coefficient.
Below, the temperature compensation principle of the utility model is elaborated.
Suppose that environment temperature reduces; Then the resistance of thermistor RT becomes (characteristic of negative temperature coefficient thermistor) greatly thereupon; The electric current that the base stage of the first triode Q1 is got diminishes, so the ducting capacity of the first triode Q1 weakens (and the first triode Q1 is ended).Along with the ducting capacity of the first triode Q1 weakens, the base voltage of the second triode Q2 raises, electric current increases.The base current increase of the second triode Q2 can make the ducting capacity of the second triode Q2 strengthen (and finally can make the second triode Q2 saturation conduction).The conducting meeting of the second triode Q2 is lighted a plurality of light emitting diodes, thereby realizes low temp compensating.
Otherwise, suppose that environment temperature raises, then the resistance of thermistor RT thereupon diminish (characteristic of negative temperature coefficient thermistor).So it is big that the base stage of the first triode Q1 is got electrorheological, then the ducting capacity of the first triode Q1 strengthens (finally can make the first triode Q1 saturation conduction).The ducting capacity of the first triode Q1 strengthens, and the reduction of the second triode Q2 base voltage, electric current are reduced.The base current of the second triode Q2 reduces, and the ducting capacity of the second triode Q2 is weakened (the second triode Q2 is ended).The ducting capacity of the second triode Q2 weakens, and can make the electric current of supplying with a plurality of light emitting diodes reduce (final no current), thereby realization high temperature is closed the function of compensating circuit.
Second aspect as the utility model provides a kind of liquid crystal display, comprises temperature-compensation circuit, and this temperature-compensation circuit is the temperature-compensation circuit among above-mentioned each embodiment.Especially, a plurality of light emitting diodes in this temperature-compensation circuit are backlights of liquid crystal display.Therefore, cost can be saved and display effect can be compensated again.Preferably, liquid crystal display is the LCM display screen.
The 3rd aspect as the utility model provides a kind of building conversational system, comprises liquid crystal display, and this liquid crystal display is above-mentioned liquid crystal display.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (8)
1. a temperature-compensation circuit is characterized in that, comprising:
Temperature collecting cell;
Compare amplifying unit, the said relatively input end of amplifying unit is connected with the output terminal of said temperature collecting cell;
Mend warm driver module, the said relatively output terminal of amplifying unit is connected with the input end of said benefit temperature driver module;
Mend warm unit, said benefit temperature unit is connected with the output terminal of said benefit temperature driver module.
2. temperature-compensation circuit according to claim 1 is characterized in that, said temperature collecting cell comprises thermistor (RT).
3. temperature-compensation circuit according to claim 1; It is characterized in that; Said relatively amplifying unit comprises first triode (Q1) and is used to set first resistance (R1) of mending warm threshold value; The base stage of said first triode (Q1) is connected with an end of said first resistance (R1), the other end ground connection of said first resistance (R1); The output terminal of said temperature collecting cell is connected with the base stage of said first triode (Q1).
4. temperature-compensation circuit according to claim 3; It is characterized in that; Said benefit temperature driver module comprises second triode (Q2), second resistance (R2) and the 3rd resistance (R3); The base stage of said second triode is connected with the collector of said first triode (Q1); The positive source of said temperature-compensation circuit is connected with the collector of said second triode (Q2) through said second resistance (R2), and the positive source of said temperature-compensation circuit is connected through the base stage of said the 3rd resistance (R3) with said second triode (Q2).
5. temperature-compensation circuit according to claim 4 is characterized in that, said benefit temperature unit comprises the light emitting diode of a plurality of series connection, and the light emitting diode of said a plurality of series connection is connected with the emitter of said second triode (Q2).
6. temperature-compensation circuit according to claim 5 is characterized in that, said benefit temperature unit also comprises the 4th resistance (R4), and the emitter of said second triode (Q2) is connected with the light emitting diode of said a plurality of series connection through said the 4th resistance (R4).
7. a liquid crystal display comprises temperature-compensation circuit, it is characterized in that, said temperature-compensation circuit is each described temperature-compensation circuit among the claim 1-6.
8. a building conversational system comprises liquid crystal display, it is characterized in that, said liquid crystal display is the described liquid crystal display of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220174237 CN202632133U (en) | 2012-04-24 | 2012-04-24 | Temperature compensating circuit, liquid crystal screen and building intercommunication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220174237 CN202632133U (en) | 2012-04-24 | 2012-04-24 | Temperature compensating circuit, liquid crystal screen and building intercommunication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202632133U true CN202632133U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220174237 Expired - Fee Related CN202632133U (en) | 2012-04-24 | 2012-04-24 | Temperature compensating circuit, liquid crystal screen and building intercommunication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202632133U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104427700A (en) * | 2013-09-04 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Overheating protection circuit, LED (light-emitting diode) drive circuit and lamp |
-
2012
- 2012-04-24 CN CN 201220174237 patent/CN202632133U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104427700A (en) * | 2013-09-04 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Overheating protection circuit, LED (light-emitting diode) drive circuit and lamp |
| CN104427700B (en) * | 2013-09-04 | 2018-10-12 | 深圳市海洋王照明工程有限公司 | Overheating protection circuit, LED drive circuit and lamps and lanterns |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20160424 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |