CN201114885Y - A driving power for LED lamp - Google Patents
A driving power for LED lamp Download PDFInfo
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- CN201114885Y CN201114885Y CNU2007200570532U CN200720057053U CN201114885Y CN 201114885 Y CN201114885 Y CN 201114885Y CN U2007200570532 U CNU2007200570532 U CN U2007200570532U CN 200720057053 U CN200720057053 U CN 200720057053U CN 201114885 Y CN201114885 Y CN 201114885Y
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Abstract
The utility model discloses a drive power for an LED lighting fixture, comprising a stabilized voltage supply, a constant-current circuit and a temperature control circuit. Connecting pins of working power supplies of the constant-current circuit and the temperature control circuit are respectively connected to an output end of the stabilized voltage supply; the constant-current circuit and the temperature control circuit are connected by a diode, wherein, an output end of the temperature control circuit is connected with the cathode of the diode while an input control end of the constant-current circuit is connected with the anode of the diode; at least two LED lamps which are connected in series are connected to a constant-current branch of the constant-current circuit. As the drive power of the utility model adopts constant current circuit technology, the electric current can be kept constant even when a certain LED lamp group is abnormal, so that the normal work of other LED lamp groups is not affected; meanwhile, by adopting the temperature control circuit, supply current can be reduced by the LED lamps when in high temperature, the temperature stops raising; therefore, temperature control is realized thereby preventing burnout of the LED lamps owing to high temperature.
Description
Technical field
The utility model relates to a kind of driving power of LED light fixture, particularly a kind of driving power with constant current and temperature controlled LED light fixture.
Background technology
High brightness, ultra-high brightness LED are solid state lighting electric light sources of new generation, and because of a series of characteristics such as its brightness height, luminous efficiency height, life-span length are subjected to people's attention highly, countries in the world have all been dropped into a large amount of human and material resources and researched and developed and use.But because the quality of high brightness, ultra-high brightness LED is difficult to reach consistent, exist deviations such as voltage, electric current, power, temperature rise, as shown in Figure 1, Figure 1A is traditional LED lamp figure that is connected in series, at power input, wherein resistance R has been done the current-limiting protection effect to the LED of series connection by resistance R and several LED series connection; Circuit shown in Figure 1B is to have done improvement on the basis of circuit shown in Figure 1A, has increased stabilized voltage power supply, and the protection of LED is increased; Fig. 1 C is the LED light fixture figure that is connected in parallel, and each LED also is connected in power input, and stabilized voltage power supply provides voltage stabilizing to LED, and LED is had the certain protection effect; Fig. 1 D also is the LED light fixture figure that is connected in parallel, and does not just adopt stabilized voltage power supply, and series connection one resistance R limits electric current before each LED in parallel, thereby plays the certain protection effect.But the big the easiest damage of element of difference when a plurality of LED series, parallel or connection in series-parallel connection use.The low the easiest damage of element of operating voltage when parallel connection is used, and the little the easiest damage of element of electric current when series connection is used.The use of LED is adopted the method for derate more in the past, and LED is not damaged when series, parallel or connection in series-parallel connection use, but this had been increased production cost.These factors affect high brightness, ultra-high brightness LED fail safe and reliability in use to a certain extent, thereby have influenced the use of high brightness, ultra-high brightness LED.
The utility model content
The purpose of this utility model provides a kind of driving power with constant current and temperature controlled LED light fixture.
The purpose of this utility model can be achieved by the following technical programs: a kind of driving power of LED light fixture, comprise stabilized voltage power supply, it is characterized in that: also comprise constant-current circuit and temperature-control circuit, constant-current circuit and temperature-control circuit working power link are connected to the output of stabilized voltage power supply respectively, connect by diode between constant-current circuit and the temperature-control circuit; Wherein the output of temperature-control circuit connects the negative electrode of diode, and the constant-current circuit control input end connects the anode of diode, and at least two LED lamps that are in series are connected on the constant current branch road of constant-current circuit.
Constant-current circuit described in the utility model comprises triode Q1, Q5, resistance R 9, R12, R13, R14; The current collection of described triode Q1 is the constant-current circuit control input end very, and collector electrode connects the stabilized voltage power supply anode through resistance R 13, and its emitter connects the stabilized voltage power supply negative terminal, and base stage connects the stabilized voltage power supply negative terminal through resistance R 12, R9; The base stage of triode Q5 connects the collector electrode of triode Q1, and the collector electrode of triode Q5 connects the stabilized voltage power supply anode, and the emitter of triode Q5 connects the stabilized voltage power supply anode through resistance R 14, between the emitter of triode Q5 and the resistance R 9 as the constant current branch road of series LED lamp.
Temperature-control circuit described in the utility model comprises thermistor RT1, voltage-stabiliser tube DW1, triode Q2 and resistance R 1, R5; Described resistance R 1, thermistor RT1, resistance R 5 are connected between the positive-negative output end of stabilized voltage power supply after being connected in series successively, serial connection point between thermistor RT1, the resistance R 5 connects the negative electrode of voltage-stabiliser tube DW1, the anode of voltage-stabiliser tube DW1 connects the base stage of triode Q2, the emitter of triode Q2 is connected to the output negative terminal of stabilized voltage power supply, and its collector electrode is as the output of temperature-control circuit.
It is AC/DC stabilized voltage power supply or DC/DC stabilized voltage power supply that the utility model is drawn together stabilized voltage power supply, to be applicable to the needs of different electrical power environment.
The utility model also can be achieved by the following technical programs: a kind of driving power of LED light fixture, comprise stabilized voltage power supply, it is characterized in that: also comprise the constant-current circuit that temperature-control circuit and at least two groups are in parallel, the working power link of temperature-control circuit and each constant-current circuit is connected to the output of stabilized voltage power supply respectively, connects by diode between each constant-current circuit and the temperature-control circuit; Wherein the output of temperature-control circuit connects the negative electrode of diode, and the constant-current circuit control input end connects the anode of diode, and at least two LED lamps that are in series are connected on the constant current branch road of constant-current circuit.
Compared with prior art, the utlity model has following advantage: one, because the utility model has adopted the constant-current circuit technology, this make a certain paths of LEDs lamp group occur when unusual also can holding current constant, thereby do not influence the work of other LED group; Two, because the utility model has been used temperature-control circuit, and this makes LED can reduce supply current when high temperature occurring, make temperature stop to rise, reach temperature controlled purpose, thereby avoided the high temperature of LED to burn out.
Description of drawings
Figure 1A, Figure 1B, Fig. 1 C, Fig. 1 D are traditional LED light fixture connection layout;
Fig. 2 is an operation principle schematic diagram of the present utility model.
Embodiment
As shown in Figure 2, the utility model comprises stabilized voltage power supply, constant-current circuit and temperature-control circuit, constant-current circuit and temperature-control circuit working power link are connected to the output of stabilized voltage power supply respectively, connect by diode between constant-current circuit and the temperature-control circuit; Wherein the output of temperature-control circuit connects the negative electrode of diode, and the constant-current circuit control input end connects the anode of diode, and three LED lamps that are in series are connected on the constant current branch road of constant-current circuit.
Above-mentioned constant-current circuit comprises triode Q1, Q5, resistance R 9, R12, R13, R14; The current collection of described triode Q1 is the constant-current circuit control input end very, and collector electrode connects the stabilized voltage power supply anode through resistance R 13, and its emitter connects the stabilized voltage power supply negative terminal, and base stage connects the stabilized voltage power supply negative terminal through resistance R 12, R9; The base stage of triode Q5 connects the collector electrode of triode Q1, and the collector electrode of triode Q5 connects the stabilized voltage power supply anode, and the emitter of triode Q5 connects the stabilized voltage power supply anode through resistance R 14, between the emitter of triode Q5 and the resistance R 9 as the constant current branch road of series LED lamp.
Above-mentioned temperature-control circuit comprises thermistor RT1, voltage-stabiliser tube DW1, triode Q2 and resistance R 1, R5; Described resistance R 1, thermistor RT1, resistance R 5 are connected between the positive-negative output end of stabilized voltage power supply after being connected in series successively, serial connection point between thermistor RT1, the resistance R 5 connects the negative electrode of voltage-stabiliser tube DW1, the anode of voltage-stabiliser tube DW1 connects the base stage of triode Q2, the emitter of triode Q2 is connected to the output negative terminal of stabilized voltage power supply, and its collector electrode is as the output of temperature-control circuit.
Base resistance R13 and the collector electrode of triode Q5 is connected to saturation conduction in the constant-current circuit, and its collector electrode, emitter produce less pressure drop to three LED power supplies of connecting with resistance R 14 parallel connections.The electric current of the LED of three series connection is by current sampling resistor R9 and produce pressure drop, when the electric current of the LED of three series connection is normal value, pressure drop＜0.7V that current sampling resistor R9 produces, the voltage that base stage obtained of triode Q1 also＜0.7V, be cut-off state, the voltage at the base stage of triode Q5 and emitter two ends does not cause change, and triode Q5 keeps original saturation conduction state, its collector electrode, emitter and the less pressure drop of resistance R 14 generations in parallel are to the LED power supply of three series connection; When overcurrent appears in the electric current of the LED of three series connection, pressure drop＞0.7V that current sampling resistor R9 produces, the voltage that base stage obtained of triode Q1 also＞0.7V, be conducting state, the base stage of triode Q5, the voltage at emitter two ends are reduced, make triode Q5 enter amplification region or cut-off region, its collector electrode, emitter and the bigger pressure drop of resistance R 14 generations in parallel, LED power supply to three series connection, thereby the LED supply current to three series connection is descended (keeping constant), thereby reached constant current control.If change the resistance value of current sampling resistor R9, this just can change the current limit of constant-current source.
Resistance R 1, thermistor RT1 and resistance R 5 constitute bleeder circuit in the temperature-control circuit, the resistance value of thermistor RT1 changes along with variations in temperature, the resistance of thermistor RT1 can descend when temperature rises, otherwise can rise, and the resistance value of change resistance R 1 can obtain different temperature control points.
The negative electrode of voltage stabilizing didoe DW1 is connected with the link of thermistor RT1, resistance R 5, temperature just often the undertension of this dividing point so that voltage stabilizing didoe DW1 punctures conducting.The resistance value of thermistor RT1 descends when temperature rises, and the voltage of this dividing point rises, and when surpassing voltage stabilizing didoe DW1 puncture voltage, voltage stabilizing didoe DW1 punctures conducting.The anode of voltage stabilizing didoe DW1 is directly to be connected with the base stage of triode Q2, and the puncture conducting meeting of voltage stabilizing didoe DW1 makes triode Q2 conducting.(triode Q2 was cut-off state originally)
Output at temperature-control circuit can connect two groups of constant-current circuits that are in parallel to the n group, the working power link of temperature-control circuit and each constant-current circuit is connected to the output of stabilized voltage power supply respectively, connects by diode between each constant-current circuit and the temperature-control circuit; Wherein the output of temperature-control circuit connects the negative electrode of diode, and the constant-current circuit control input end connects the anode of diode, and three LED lamps that are in series are connected on the constant current branch road of constant-current circuit.
Thermistor can be installed in the highest place of lamp temperatures, because the collector electrode of triode Q2 is by diode D1, D2, Dn is connected with all constant-current circuit, triode Q2 conducting when overtemperature, triode Q5, Q25, the base voltage of Qn5 descends, this makes triode Q5, Q25, Qn5 becomes amplification region or cut-off region by saturation conduction, in resistance R 14, R24, Rn4 produces bigger voltage drop, reduced the supply current of each road series LED, make the working temperature of the LED of each road series connection stop to rise, reach the purpose of temperature control.The stabilized voltage power supply that adopts can be AC/DC stabilized voltage power supply or DC/DC stabilized voltage power supply, to be applicable to the needs of different electrical power environment.
At the driving power of LED light fixture when Qi Liang works, occur unusual (as short circuit as the LED of one tunnel series connection, electric leakage or electric current are excessive etc.), this corresponding constant-current circuit makes the supply power voltage electricity decline (making supply current keep constant) of the LED of three series connection, thereby reached constant current control, but the LED that is connected in other each road simultaneously can not exert an influence.
Claims (5)
1, a kind of driving power of LED light fixture, comprise stabilized voltage power supply, it is characterized in that: also comprise constant-current circuit and temperature-control circuit, constant-current circuit and temperature-control circuit working power link are connected to the output of stabilized voltage power supply respectively, connect by diode between constant-current circuit and the temperature-control circuit; Wherein the output of temperature-control circuit connects the negative electrode of diode, and the constant-current circuit control input end connects the anode of diode, and at least two LED lamps that are in series are connected on the constant current branch road of constant-current circuit.
2, the driving power of a kind of LED light fixture according to claim 1 is characterized in that: described constant-current circuit comprises triode Q1, Q5, resistance R 9, R12, R13, R14; The current collection of described triode Q1 is the constant-current circuit control input end very, and collector electrode connects the stabilized voltage power supply anode through resistance R 13, and its emitter connects the stabilized voltage power supply negative terminal, and base stage connects the stabilized voltage power supply negative terminal through resistance R 12, R9; The base stage of triode Q5 connects the collector electrode of triode Q1, and the collector electrode of triode Q5 connects the stabilized voltage power supply anode, and the emitter of triode Q5 connects the stabilized voltage power supply anode through resistance R 14, between the emitter of triode Q5 and the resistance R 9 as the constant current branch road of series LED lamp.
3, the driving power of a kind of LED light fixture according to claim 1 is characterized in that: described temperature-control circuit comprises thermistor RT1, voltage-stabiliser tube DW1, triode Q2 and resistance R 1, R5; Described resistance R 1, thermistor RT1, resistance R 5 are connected between the positive-negative output end of stabilized voltage power supply after being connected in series successively, serial connection point between thermistor RT1, the resistance R 5 connects the negative electrode of voltage-stabiliser tube DW1, the anode of voltage-stabiliser tube DW1 connects the base stage of triode Q2, the emitter of triode Q2 is connected to the output negative terminal of stabilized voltage power supply, and its collector electrode is as the output of temperature-control circuit.
4, the driving power of a kind of LED light fixture according to claim 1 is characterized in that: stabilized voltage power supply is AC/DC stabilized voltage power supply or DC/DC stabilized voltage power supply.
5, a kind of driving power of LED light fixture, comprise stabilized voltage power supply, it is characterized in that: also comprise the constant-current circuit that temperature-control circuit and at least two groups are in parallel, the working power link of temperature-control circuit and each constant-current circuit is connected to the output of stabilized voltage power supply respectively, connects by diode between each constant-current circuit and the temperature-control circuit; Wherein the output of temperature-control circuit connects the negative electrode of diode, and the constant-current circuit control input end connects the anode of diode, and at least two LED lamps that are in series are connected on the constant current branch road of constant-current circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200570532U CN201114885Y (en) | 2007-09-17 | 2007-09-17 | A driving power for LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200570532U CN201114885Y (en) | 2007-09-17 | 2007-09-17 | A driving power for LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114885Y true CN201114885Y (en) | 2008-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200570532U Expired - Fee Related CN201114885Y (en) | 2007-09-17 | 2007-09-17 | A driving power for LED lamp |
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| Country | Link |
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| CN (1) | CN201114885Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169672A (en) * | 2011-03-19 | 2011-08-31 | 福州华映视讯有限公司 | Backlight module, over-temperature protective circuit and over-temperature protective method |
| CN112616221A (en) * | 2021-01-05 | 2021-04-06 | 红壹佰照明有限公司 | CDR current-limiting constant current LED drive circuit |
-
2007
- 2007-09-17 CN CNU2007200570532U patent/CN201114885Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169672A (en) * | 2011-03-19 | 2011-08-31 | 福州华映视讯有限公司 | Backlight module, over-temperature protective circuit and over-temperature protective method |
| CN102169672B (en) * | 2011-03-19 | 2014-02-26 | 福州华映视讯有限公司 | Backlight module, over-temperature protective circuit and over-temperature protective method |
| CN112616221A (en) * | 2021-01-05 | 2021-04-06 | 红壹佰照明有限公司 | CDR current-limiting constant current LED drive circuit |
| CN112616221B (en) * | 2021-01-05 | 2024-04-12 | 红壹佰照明股份有限公司 | CDR current-limiting constant-current LED drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080910 Termination date: 20100917 |