CN204350416U - Classroom LED low-temperature startup device - Google Patents
Classroom LED low-temperature startup device Download PDFInfo
- Publication number
- CN204350416U CN204350416U CN201520077414.4U CN201520077414U CN204350416U CN 204350416 U CN204350416 U CN 204350416U CN 201520077414 U CN201520077414 U CN 201520077414U CN 204350416 U CN204350416 U CN 204350416U
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- China
- Prior art keywords
- resistance
- triode
- power supply
- control circuit
- gate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Control Of Resistance Heating (AREA)
Abstract
The utility model discloses a kind of classroom LED low-temperature startup device, comprise the control circuit and resistive heater R6 that couple; Control circuit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, triode Q1, triode Q2, electric capacity C1, NOR gate U2, semistor RT and relay K A1, control circuit detects the voltage of LED constant current power output end to control the operation of resistive heater R6, when temperature is too low, when power supply can not normally start, power output end Non voltage output, control circuit controls resistive heater R6 and obtains electric, starts heating.When temperature is elevated to certain numerical value, when Switching Power Supply can normally start, output has normal voltage to export, and control circuit controls resistive heater R6 and stops heating.The utility model is easy to use, and reliability is high.
Description
Technical field
The utility model relates to a kind of power circuit, specifically, relates to one and is applicable to classroom illumination classroom LED low-temperature startup device, belong to instructional technology field.
Background technology
At present, LED lamp is day by day universal, is just progressively applied to various complex environment.In high latitude area, as in northern China, especially the ground such as northeast, has extreme severe cold weather winter.When temperature is lower than-45 DEG C, traditional LED is difficult to normal startup, uses inconvenience, affects it and promotes.Although also there is low-temperature start-up circuit at present, these circuit sensitivities are low, low-response, and effect is undesirable, affect the illumination of classroom, and Chinese course student reads many, especially influenced during reading.
Utility model content
The technical problems to be solved in the utility model is for above deficiency, provides a kind of classroom LED low-temperature startup device, and at low ambient temperatures, it can be helped to start for power supply heating, sensitive, fast response time, reliability is high.
For solving above technical problem, the utility model by the following technical solutions: classroom LED low-temperature startup device, is characterized in that: described low-temperature start-up circuit comprises the control circuit and resistive heater R6 that couple;
Described control circuit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, triode Q1, triode Q2, electric capacity C1, NOR gate U2, semistor RT and relay K A1, and resistance R1 and resistance R2 is connected between the output of LED constant current power supply;
The tie point of described resistance R1 and resistance R2 connects the base stage of triode Q1, one end of the collector electrode connecting resistance R3 of triode Q1, an input of one end of the emitter connecting resistance R4 of triode Q1, one end of electric capacity C1, NOR gate U2, the other end of resistance R4, the other end ground connection of electric capacity C1;
One end of another input connecting resistance R5 of described NOR gate U2, one end of semistor RT, another termination power of resistance R5, the power end of NOR gate U2;
The other end ground connection of described semistor RT, the base stage of the output termination triode Q2 of NOR gate U2, the grounded emitter of triode Q2, one end of collector connecting relay KA1 coil of triode Q2, the positive pole of diode D1;
The other end, the power supply of the other end of described relay K A1 coil, the negative pole connecting resistance R3 of diode D1, resistive heater R6 connects the input of LED constant current power supply through the normally open contact of relay K A1.
After the utility model adopts above technical scheme, compared with prior art, have the following advantages: when temperature is too low, when power supply can not normally start, power output end Non voltage output, control circuit controls resistive heater R6 and obtains electric, starts heating.When temperature is elevated to certain numerical value, when Switching Power Supply can normally start, output has normal voltage to export, and control circuit controls resistive heater R6 and stops heating.
When causing no-output due to Switching Power Supply faults itself, if temperature is lower, heater circuit work.When temperature reaches certain numerical value, semistor RT resistance is elevated to certain numerical value, makes another input of OR-NOT circuit U2 be high level, OR-NOT circuit U2 output low level, normally open contact disconnects, and stops heating, prevents superheated from causing artificial damage.
Classroom LED low-temperature startup device due to the operating time shorter, need not consider its heat dissipation problem, the part insulation material except heating resistor wraps up, and makes its temperature can not be too low, ensures reliably working.Also can draw with long line, be placed on the place that temperature is higher, sensitive, fast response time, easy to use, reliability is high.
Below in conjunction with drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit diagram of LED low-temperature startup device in classroom in the utility model embodiment;
In figure,
1-power circuit, 2-control circuit, 3-LED constant-current supply.
Embodiment
Embodiment, as shown in Figure 1, classroom LED low-temperature startup device, comprises the power circuit 1, control circuit 2 and the resistive heater R6 that couple with LED constant current power supply 3, the input termination power of LED constant current power supply, the output terminating load of LED constant current power supply 3.
Power circuit 1 comprises transformer T, rectifier bridge, three terminal regulator U1, electric capacity C2 and electric capacity C3, and the positive pole of rectifier bridge connects one end of electric capacity C3, the input of three terminal regulator U1, the negative pole of diode D1; One end of the output termination capacitor C2 of three terminal regulator U1, the other end of resistance R5, the other end of electric capacity C3, the other end ground connection of electric capacity C2.Power circuit 1 also can adopt the circuit of other form, is not limited to this particular electrical circuit of the present embodiment, as long as provide working power for other circuit, those skilled in the art can make a choice according to the explanation of this starting drive.
Control circuit 2 comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, triode Q1, triode Q2, electric capacity C1, NOR gate U2, semistor RT and relay K A1, resistance R1 and resistance R2 is connected between the output of LED constant current power supply, the tie point of resistance R1 and resistance R2 connects the base stage of triode Q1, one end of the collector electrode connecting resistance R3 of triode Q1, one end of the emitter connecting resistance R4 of triode Q1, one end of electric capacity C1, an input of NOR gate U2, the other end of resistance R4, the other end ground connection of electric capacity C1, one end of another input connecting resistance R5 of NOR gate U2, one end of semistor RT, another termination power of resistance R5, the output of power supply and three terminal regulator U1, the power end of NOR gate U2, the other end ground connection of semistor RT, the base stage of the output termination triode Q2 of NOR gate U2, the grounded emitter of triode Q2, one end of the collector connecting relay KA1 coil of triode Q2, the positive pole of diode D1, the other end of relay K A1 coil, the other end of the negative pole connecting resistance R3 of diode D1, power supply, the input of power supply and three terminal regulator U1, resistive heater R6 connects the input of LED constant current power supply 3 through the normally open contact of relay K A1, i.e. 220V electrical network.
220V line voltage is through transformer T rectification, and electric capacity C3 filtering, obtains a direct voltage, and this direct voltage is transformed to stable 5V direct current, for OR-NOT circuit U2 powers through three terminal regulator U1.When temperature is too low, when power supply can not normally start, power output end Non voltage output, after resistance R1, resistance R2 dividing potential drop, voltage is 0, and namely the base voltage of triode Q1 is 0, triode Q1 ends, triode Q1 launches very low level, and an input of OR-NOT circuit U2 is low level, and semistor RT is semistor, now resistance is lower, makes another input of OR-NOT circuit U2 also be low level.OR-NOT circuit U2 exports high level, triode Q2 saturation conduction, and relay K A1 coil obtains electric, and normally open contact closes, and resistive heater R6 obtains electric, starts heating.When temperature is elevated to certain numerical value, when Switching Power Supply can normally start, output has normal voltage to export, a high level is obtained through resistance R1, resistance R2 dividing potential drop, make triode Q1 saturation conduction, the emitter voltage of triode Q1 raises, and makes OR-NOT circuit U2 mono-input be high level, output low level.Triode Q2 ends, relay K A1 coil blackout, and normally open contact disconnects, and stops heating.
When causing no-output due to Switching Power Supply faults itself, if temperature is lower, heater circuit work.When temperature reaches certain numerical value, semistor RT resistance is elevated to certain numerical value, makes another input of OR-NOT circuit U2 be high level, OR-NOT circuit U2 output low level, normally open contact disconnects, and stops heating, prevents superheated from causing artificial damage.
Help start-up circuit due to the operating time shorter, need not consider its heat dissipation problem, the part insulation material except heating resistor wraps up, and makes its temperature can not be too low, ensures reliably working.Also can draw with long line, be placed on the place that temperature is higher.
Above three terminal regulator U1, OR-NOT circuit U2 and LED constant current power supply all can adopt known products on sale on market, and those skilled in the art can carry out selecting its model according to Conventional wisdom; As the LED constant current power supply that Jing Wei Science and Technology Ltd. of China Airlines Limited of Shenzhen produces.
Product of the present utility model is carried out reliability testing to LED switch power supply and common LED constant-current supply product when-50 DEG C of low temperature, find the reliability of reliability apparently higher than common LED constant-current supply of the utility model LED constant current power supply, the utility model product switch 100 times, the number of times that can accurately start is 100 times, common LED constant-current supply product starts 100 times, only has 70 times.During startup, the utility model product is compared common LED constant-current supply product and is on average reduced by 60% start-up time, and therefore, sensitivity is higher, and response speed is faster.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; to enable those skilled in the art better understand the utility model content; should not be understood as the restriction to the utility model protection range; as long as according to the improvement that technical solutions of the utility model are done, all fall into protection range of the present utility model.
Claims (1)
1. classroom LED low-temperature startup device, is characterized in that: described low-temperature start-up circuit comprises the control circuit (2) and resistive heater R6 that couple;
Described control circuit (2) comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, triode Q1, triode Q2, electric capacity C1, NOR gate U2, semistor RT and relay K A1, and resistance R1 and resistance R2 is connected between the output of LED constant current power supply;
The tie point of described resistance R1 and resistance R2 connects the base stage of triode Q1, one end of the collector electrode connecting resistance R3 of triode Q1, an input of one end of the emitter connecting resistance R4 of triode Q1, one end of electric capacity C1, NOR gate U2, the other end of resistance R4, the other end ground connection of electric capacity C1;
One end of another input connecting resistance R5 of described NOR gate U2, one end of semistor RT, another termination power of resistance R5, the power end of NOR gate U2;
The other end ground connection of described semistor RT, the base stage of the output termination triode Q2 of NOR gate U2, the grounded emitter of triode Q2, one end of collector connecting relay KA1 coil of triode Q2, the positive pole of diode D1;
The other end, the power supply of the other end of described relay K A1 coil, the negative pole connecting resistance R3 of diode D1, resistive heater R6 connects the input of LED constant current power supply (3) through the normally open contact of relay K A1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520077414.4U CN204350416U (en) | 2015-01-31 | 2015-01-31 | Classroom LED low-temperature startup device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520077414.4U CN204350416U (en) | 2015-01-31 | 2015-01-31 | Classroom LED low-temperature startup device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204350416U true CN204350416U (en) | 2015-05-20 |
Family
ID=53233653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520077414.4U Expired - Fee Related CN204350416U (en) | 2015-01-31 | 2015-01-31 | Classroom LED low-temperature startup device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204350416U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949118A (en) * | 2017-12-28 | 2018-04-20 | 广州爱易学智能信息科技有限公司 | The thermal-shutdown circuit of classroom blackboard LED light strip |
-
2015
- 2015-01-31 CN CN201520077414.4U patent/CN204350416U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949118A (en) * | 2017-12-28 | 2018-04-20 | 广州爱易学智能信息科技有限公司 | The thermal-shutdown circuit of classroom blackboard LED light strip |
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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: 20150520 Termination date: 20160131 |
|
| EXPY | Termination of patent right or utility model |