CN201489378U - Temperature control circuit and television set-top box device using same - Google Patents
Temperature control circuit and television set-top box device using same Download PDFInfo
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- CN201489378U CN201489378U CN2009202040135U CN200920204013U CN201489378U CN 201489378 U CN201489378 U CN 201489378U CN 2009202040135 U CN2009202040135 U CN 2009202040135U CN 200920204013 U CN200920204013 U CN 200920204013U CN 201489378 U CN201489378 U CN 201489378U
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- voltage comparator
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- thermistor
- output terminal
- control circuit
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Abstract
The utility model provides a temperature control circuit comprising a thermistor (Rt), a potentiometer (Rp), a voltage comparator (U1) and a controlling and executing component, wherein the thermistor (Rt) is used for detecting temperature, connected in series with a resistor (R1) and connected with an external power source; the potentiometer (Rp) is connected in series with a resistor (R2) which is further connected with the external power source; the positive input terminal of the voltage comparator (U1) is connected with the common terminal of the thermistor (Rt) and the resistor (R1), the negative input terminal thereof is connected with the adjusting terminal of the potentiometer (Rp) and the threshold voltage thereof is equal to the input voltage of the positive input terminal at the threshold temperature; and the controlling and executing component is connected to the output terminal of the voltage comparator (U1) and used for controlling the operation of a cooling fan or the switching of a functional module according to the output level of the voltage comparator (U1). The utility model further discloses a television set-top box device comprising the temperature control circuit. The utility model has the advantages of simple circuit structure and low implementation cost, saves the electric energy and improves the operational reliability of the device.
Description
Technical field
The utility model relates to a kind of control circuit, especially relates to a kind of opertaing device internal temperature, improves the temperature-control circuit of equipment work performance, and the TV set-top box equipment that uses this temperature-control circuit.
Background technology
The various parts that electronic equipment uses have the tendency of high performance and high heating, thereby the temperature of control electronic equipment internal becomes the big event of keeping properties of product.
Temperature is to influence the most important factor of reliability of electronic equipment, and this need take the temperature rise of thermal design measure restriction electronic equipment internal technically.The principle of thermal design: the one, reduce thermal value, comprise and select more excellent control mode and technology for use, select the components and parts of low-power consumption and the number of minimizing heating components and parts for use; But strengthen heat radiation, promptly utilize conduction, radiation, convection techniques with transfer of heat.
With TV set-top box equipment is example, it is the flat electronic equipment of a kind of profile, has limited physical space, thereby in the inner limited space of product, be difficult to accomplish to use more heat radiator and powerful fan to add the compulsive-cooling heat dissipation design, also be difficult in the thermal design of realization heat loss through radiation in the inner limited space of product simultaneously.The temperature control mode of TV set-top box equipment roughly has two kinds at present:
The one, by temperature sensor checkout equipment internal temperature, through the A/D conversion temperature data is reached the microprocessor of equipment then, by the monitoring of microprocessor realization to temperature rise, when temperature rise reaches in limited time, remind user's closing television set-top box device by the 0SD display screen, allow TV set-top box equipment quit work and reach the purpose of heat radiation.This mode need be used auxiliary temperature sensing circuit, realizes that cost is higher; Need monitor by microprocessor simultaneously, thereby take the limited I/O resource of microprocessor.
Another kind of mode is exactly the work that the radiator fan of TV set-top box device interior is not stopped, and strengthens the purpose that device interior and extraneous heat interchange reach heat radiation.This mode significant adverse is in environmental protection.
The defective that control exists in view of the temperature of present TV set-top box equipment, thereby be necessary that development and Design is a kind of and realize that lower-cost more effective temperature controls the job stability that improves TV set-top box equipment.
The utility model content
The utility model proposes a kind of temperature-control circuit and use the TV set-top box equipment of this circuit, by thermistor internal temperature is sampled, by voltage comparator the temperature of sampling is judged the level that output is corresponding again, control the operation of fan electromotor or the start or stop of functional module according to output level, thereby reach temperature controlled purpose.
For reaching above-mentioned purpose, the utility model has adopted following technical scheme: a kind of temperature-control circuit, and it comprises:
The thermistor Rt that is used for detected temperatures, its series resistor R1 also connects external power source;
Potentiometer Rp with resistance R 2 serial connections that are connected external power source;
Positive input terminal connects the common port of thermistor Rt and resistance R 1, and negative input end connects the voltage comparator U1 of the adjustable side of potentiometer Rp, the input voltage of positive input terminal when its threshold voltage equals threshold temperature;
Be connected voltage comparator U1 output terminal, according to the control actuating component of voltage comparator U1 output level control radiator fan running or functional module start or stop.
In one embodiment, described control actuating component comprises: be connected the relay K between voltage comparator U1 output terminal and the external power source, the normally opened contact of this relay K is serially connected among the driving loop of the fan electromotor M that controls the radiator fan running.
In another embodiment, described control actuating component comprises: be connected with voltage comparator U1 output terminal by one of them I/O interface, and be used for microprocessor according to the level control function module start or stop of I/O interface.
Wherein, described voltage comparator U1 output terminal serial connection current-limiting resistance R3.
Wherein, forward is connected in series diode DZ1 between described voltage comparator U1 output terminal and the external power source, oppositely is connected in series diode DZ2 between described voltage comparator U1 output terminal and the ground.
Wherein, the described thermistor Rt thermistor that is negative temperature coefficient.
Wherein, described thermistor Rt attaches and is arranged on the heat radiator of power device.
In addition, the utility model discloses a kind of TV set-top box equipment, comprises casing, is arranged on the circuit board that is used to receive and handle TV signal in the casing, has microprocessor on this circuit board, it is characterized in that, also comprises:
Be attached to the thermistor Rt that is used for detected temperatures on the heat radiator of microprocessor, its series resistor R1 also connects external power source;
Potentiometer Rp with resistance R 2 serial connections that are connected external power source;
Positive input terminal connects the common port of thermistor Rt and resistance R 1, and negative input end connects the voltage comparator U1 of the adjustable side of potentiometer Rp, the input voltage of positive input terminal when its threshold voltage equals threshold temperature;
Be connected voltage comparator U1 output terminal, according to the control actuating component of voltage comparator U1 output level control radiator fan running or functional module start or stop.
Compared with prior art, the utlity model has following beneficial effect:
The utility model is sampled to the internal temperature of TV set-top box equipment by thermistor, by voltage comparator the temperature of sampling is judged again, the level of output judged result correspondence, control the operation of fan electromotor or the start or stop of functional module by output level then, thereby reach temperature control to TV set-top box equipment, have circuit structure simple, realize lower-cost advantage, but and saves energy, improve the job stability and the reliability of equipment.
Description of drawings
Fig. 1 is the circuit diagram of the 1st embodiment of the present utility model;
Fig. 2 is the temperature variant impedance operator synoptic diagram of the resistance of thermistor;
Fig. 3 is the circuit diagram of the 2nd embodiment of the present utility model.
Embodiment
The utility model is by thermistor the internal temperature of TV set-top box equipment to be sampled, by voltage comparator the temperature of sampling is judged again, the level of output judged result correspondence, control the operation of fan electromotor or the start or stop of functional module by output level then, thereby reach temperature control to TV set-top box equipment, realize that not only cost is lower, but and saves energy.
The 1st embodiment
As shown in Figure 1, this temperature-control circuit comprises: external power source (being generally 5V voltage) is added on the thermistor Rt and resistance R 1 of serial connection, and thermistor Rt is connected the positive input terminal of voltage comparator U1 with the common port of resistance R 1, and its voltage is VA; Resistance R 2 is connected in series with potentiometer Rp and constitutes voltage divider, and this voltage divider is connected between external power source and the ground, and the negative input end of the adjustable side of potentiometer Rp connection voltage comparator U1, and its voltage is VB; Externally be connected in series relay K between the output terminal of power supply and voltage comparator U1, its normally opened contact is serially connected among the driving circuit of the motor M that drives the radiator fan motion; And also be connected 2 diode DZ1 and DZ2 between external power source and the ground, and the output terminal of voltage comparator U1 is connected the common port of diode DZ1 and DZ2; In addition, the output terminal of voltage comparator U1 serial connection current-limiting resistance R3.
Wherein, thermistor Rt adopts negative temperature coefficient (NTC) thermistor, sticks on the heat radiator of power device (being generally microprocessor) of TV set-top box device interior the temperature of detection power device.As shown in Figure 2, according to the characteristic of thermistor, its resistance is downward trend with the rising of temperature, and is single-valued function.
When the external power source of 5V was added on thermistor Rt and the resistance R 1, along with the temperature on the heat radiator rises, then the resistance of thermistor Rt descended, and VA is risen; Suppose temperature on the heat radiator rise to threshold temperature X ℃ (such as, threshold temperature X is 70 ℃) time connect fan M, then we can obtain the resistance of thermistor Rt in the time of X ℃ by property list or the experiment of thermistor Rt, the resistance of resistance R 1 is constant, by calculating calculate this moment VA magnitude of voltage.
Simultaneously, the adjustable side of regulator potentiometer RP can change the size of VB.The VB value is a voltage comparator U1 preset threshold voltage, is called VTH.When design, set VTH according to threshold temperature X ℃ VA voltage, voltage VA when making VTH equal threshold temperature X ℃, in case when making temperature surpass X ℃, VA＞VTH, then voltage comparator U1 exports high level, the normally opened contact closure of relay K, thus make fan electromotor M entry into service, drive radiator fan and dispel the heat; When heat looses after below X ℃, VA＜VTH, the normally opened contact of relay K disconnects, and fan electromotor M is shut down, thereby radiator fan quits work.
Therefore, the temperature-control circuit of present embodiment only can realize having the low advantage of cost of development by thermistor and voltage comparator, and need not take the I/O resource of microprocessor, can also control radiator fan according to temperature altitude, has saved electric energy.
The 2nd embodiment
As shown in Figure 3.Compare with Fig. 1, present embodiment does not adopt relay K to control the running of fan electromotor M, but the output terminal of voltage comparator U1 is connected one of them I/O interface of microprocessor.When design supposition thermistor Rt detect temperature reach threshold temperature X ℃ (such as, X is 70 ℃) time makes direct standby of TV set-top box equipment or selection close some functional modules to cut down the consumption of energy, and the VA when then being provided with threshold temperature X ℃ equals voltage comparator U1 preset threshold voltage VTH; So when in a single day thermistor Rt detects temperature above X ℃, VA＞VTH, then voltage comparator U1 exports high level, when detecting during high level by the I/O interface of microprocessor, can select to close some functional modules, power consumption is reduced, or directly standby, can inform the user by OSD simultaneously; When heat looses after below X ℃, VA＜VTH, the output terminal output low level of voltage comparator U1 then, the output terminal of voltage comparator U1 is given the I/O interface of microprocessor, and microprocessor control TV set-top box equipment recovers operate as normal.
The temperature-control circuit of present embodiment, only whether get final product the judgment device internal temperature greater than threshold temperature by thermistor and voltage comparator, and the start or stop by the microprocessor controlled apparatus inner function module is scalable control internal temperature, thereby has the advantage that circuit structure is simple, cost of development is low.
Claims (10)
1. a temperature-control circuit is characterized in that, comprising:
The thermistor (Rt) that is used for detected temperatures, its series resistor (R1) also connects external power source;
Potentiometer (Rp) with the resistance that is connected external power source (R2) serial connection;
Positive input terminal connects the common port of thermistor (Rt) and resistance (R1), and negative input end connects the voltage comparator (U1) of the adjustable side of potentiometer (Rp), the input voltage of positive input terminal when its threshold voltage equals threshold temperature;
Be connected voltage comparator (U1) output terminal, according to the control actuating component of voltage comparator (U1) output level control radiator fan running or functional module start or stop.
2. temperature-control circuit according to claim 1, it is characterized in that, described control actuating component comprises: be connected the relay (K) between voltage comparator (U1) output terminal and the external power source, the normally opened contact of this relay (K) is serially connected among the driving loop of the fan electromotor (M) of controlling the radiator fan running.
3. temperature-control circuit according to claim 1, it is characterized in that, described control actuating component comprises: be connected with voltage comparator (U1) output terminal by one of them I/O interface, and be used for microprocessor according to the level control function module start or stop of I/O interface.
4. temperature-control circuit according to claim 1 is characterized in that, described voltage comparator (U1) output terminal serial connection current-limiting resistance (R3).
5. temperature-control circuit according to claim 1, it is characterized in that, forward is connected in series diode (DZ1) between described voltage comparator (U1) output terminal and the external power source, oppositely is connected in series diode (DZ2) between described voltage comparator (U1) output terminal and the ground.
6. temperature-control circuit according to claim 1 is characterized in that, described thermistor (Rt) is the thermistor of negative temperature coefficient.
7. temperature-control circuit according to claim 1 is characterized in that, described thermistor (Rt) attaches and is arranged on the heat radiator of power device.
8. a TV set-top box equipment comprises casing, is arranged on the circuit board that is used to receive and handle TV signal in the casing, has microprocessor on this circuit board, it is characterized in that, also comprises:
Be attached to the thermistor (Rt) that is used for detected temperatures on the heat radiator of microprocessor, its series resistor (R1) also connects external power source;
Potentiometer (Rp) with the resistance that is connected external power source (R2) serial connection;
Positive input terminal connects the common port of thermistor (Rt) and resistance (R1), and negative input end connects the voltage comparator (U1) of the adjustable side of potentiometer (Rp), the input voltage of positive input terminal when its threshold voltage equals threshold temperature;
Be connected voltage comparator (U1) output terminal, according to the control actuating component of voltage comparator (U1) output level control radiator fan running or functional module start or stop.
9. described according to Claim 8 TV set-top box equipment is characterized in that, one of them I/O interface of described microprocessor is connected with voltage comparator (U1) output terminal, is used for the level control function module start or stop according to the I/O interface.
10. described according to Claim 8 TV set-top box equipment, it is characterized in that, described control actuating component comprises: be connected the relay (K) between voltage comparator (U1) output terminal and the external power source, the normally opened contact of this relay (K) is serially connected among the driving loop of the fan electromotor (M) of controlling the radiator fan running.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202040135U CN201489378U (en) | 2009-08-21 | 2009-08-21 | Temperature control circuit and television set-top box device using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202040135U CN201489378U (en) | 2009-08-21 | 2009-08-21 | Temperature control circuit and television set-top box device using same |
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| CN201489378U true CN201489378U (en) | 2010-05-26 |
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| CN2009202040135U Expired - Fee Related CN201489378U (en) | 2009-08-21 | 2009-08-21 | Temperature control circuit and television set-top box device using same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539002A (en) * | 2011-12-10 | 2012-07-04 | 洛阳市环城供电局 | Temperature alarm of transformer |
| CN103123507A (en) * | 2011-11-18 | 2013-05-29 | 康佳集团股份有限公司 | Method for automatically controlling temperature in set-top box and equipment thereof |
| CN103166059A (en) * | 2011-12-12 | 2013-06-19 | 鸿富锦精密工业（深圳）有限公司 | Extension socket assembly with thermal protection function |
| CN103402065A (en) * | 2013-08-09 | 2013-11-20 | 广州长嘉电子有限公司 | Temperature detection method and system for smart television |
| CN103997682A (en) * | 2014-05-13 | 2014-08-20 | 深圳市九洲电器有限公司 | Temperature control method and system of set top box |
| CN106569520A (en) * | 2016-11-11 | 2017-04-19 | 成都意科科技有限责任公司 | Power supply monitoring module based on LCD |
| CN107229300A (en) * | 2017-08-01 | 2017-10-03 | 任宝泉 | A kind of automatic thermostat for greenhouse air discharging machine |
| CN107508257A (en) * | 2017-07-06 | 2017-12-22 | 武汉光迅科技股份有限公司 | A kind of monitoring temperature and protection device and method |
-
2009
- 2009-08-21 CN CN2009202040135U patent/CN201489378U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103123507A (en) * | 2011-11-18 | 2013-05-29 | 康佳集团股份有限公司 | Method for automatically controlling temperature in set-top box and equipment thereof |
| CN102539002A (en) * | 2011-12-10 | 2012-07-04 | 洛阳市环城供电局 | Temperature alarm of transformer |
| CN103166059A (en) * | 2011-12-12 | 2013-06-19 | 鸿富锦精密工业（深圳）有限公司 | Extension socket assembly with thermal protection function |
| CN103402065A (en) * | 2013-08-09 | 2013-11-20 | 广州长嘉电子有限公司 | Temperature detection method and system for smart television |
| CN103997682A (en) * | 2014-05-13 | 2014-08-20 | 深圳市九洲电器有限公司 | Temperature control method and system of set top box |
| WO2015172624A1 (en) * | 2014-05-13 | 2015-11-19 | 深圳市九洲电器有限公司 | Set top box temperature control method and control system |
| CN106569520A (en) * | 2016-11-11 | 2017-04-19 | 成都意科科技有限责任公司 | Power supply monitoring module based on LCD |
| CN107508257A (en) * | 2017-07-06 | 2017-12-22 | 武汉光迅科技股份有限公司 | A kind of monitoring temperature and protection device and method |
| CN107229300A (en) * | 2017-08-01 | 2017-10-03 | 任宝泉 | A kind of automatic thermostat for greenhouse air discharging machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN SKYWORTH DIGITAL TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SKY-WORTH DIGITAL TECHNOLOGY CO., LTD.;SHENZHEN CITY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A14 Patentee after: Shenzhen Skyworth Digital Technology Co., Ltd. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A14 Patentee before: Shenzhen Skyworth Digital Technology Co., Ltd. |
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| 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: 20100526 Termination date: 20170821 |