CN202931607U - Pulse width modulation type LED (Light-Emitting Diode) lamp driving circuit with current protection capability - Google Patents
Pulse width modulation type LED (Light-Emitting Diode) lamp driving circuit with current protection capability Download PDFInfo
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- CN202931607U CN202931607U CN 201220512017 CN201220512017U CN202931607U CN 202931607 U CN202931607 U CN 202931607U CN 201220512017 CN201220512017 CN 201220512017 CN 201220512017 U CN201220512017 U CN 201220512017U CN 202931607 U CN202931607 U CN 202931607U
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Abstract
The utility model relates to a power supply circuit and particularly relates to a pulse width modulation type LED (Light-Emitting Diode) lamp driving circuit with current protection capability. The pulse width modulation type LED lamp driving circuit is characterized by comprising a control tube connected at a load loop in series, wherein the base electrode of the control tube is connected with a constant current circuit; two ends of the load loop are connected on the positive and negative output ends of a power supply E in series; a current limiting resistor R1 and a voltage-stabilizing tube Dw are connected in series between the positive and negative output ends of the power supply E; a stable DC voltage output by the connection point of the current limiting resistor R1 and the voltage-stabilizing tube Dw is connected to the power end of the constant current circuit by virtue of a resistor R2; the other end of the constant current circuit is electrically connected with the base electrode of the control tube; a feedback resistor R4 is connected between the emitting electrode of the control tube and the negative output end of the power supply E; the electric connection point of the feedback resistor R4 and the emitting electrode of the control tube is electrically connected with the base electrode of a protective triode T2; and the collecting electrode and emitting electrode of the protective triode T2 are connected in series between the base electrode of the control tube and the negative output end of the power supply E. The pulse width modulation type LED lamp driving circuit with current protection capability, provided by the utility model, has the advantages of good stability, high reliability and low cost.
Description
Technical field
The utility model relates to a kind of power circuit, particularly has the pulse-width modulation type LED lamp drive circuit of current protection ability.
Technical background
The LED lighting technology has energy-saving and environmental protection and long-life characteristics as the third generation lighting source after incandescent lamp, fluorescent lamp; The LED Lighting Industry is risen rapidly under the trend of environmental protection and energy-saving and emission-reduction in recent years, becomes the rising industry of 21 century, is especially opening in advance the wide market that LED is applied to throw light on aspect LED street lamp and city lighting engineering.
It is the semiconductor device of characteristic sensitivity due to LED; and have negative temperature characteristic, high-power LED light source mostly is operated in the low-voltage and high-current state at present, therefore must stablize and protect its operating state and environment in application process; suitable electric current is provided, guarantees its stabilized illumination.
What use due to our normal lighting is AC 220 V, so must obtain with the technology of step-down lower voltage, usually adopt transformer or Switching Power Supply step-down, then AC rectification is become direct current, then be transformed into constant-current source, offer LED light source, no matter make it luminous, be transformer or Switching Power Supply step-down, and system all can be for coming certain loss, general power loss is in 15% left and right, and system effectiveness is difficult to accomplish greater than 90%.
LED light source is a kind of long-life light source, the theoretical life-span can reach 100,000 hours, if heat dissipation design is unreasonable, the chip temperature of high-power LED light source (junction temperature TJ) can sharply rise, when temperature rises over maximum allowable temperature (being generally 150 ℃), LED can damage because of overheated, and the General Requirements junction temperature will lower than 95 ℃, surpass 95 ℃ of light extraction efficiency and life-spans that can affect LED.
Due to existing circuit design, cause power supply conversion efficiency low, as the power of light output, all as heat dissipation, do not increase the light fixture temperature rise, affect the junction temperature of LED, when the junction temperature of LED surpasses 95 ℃, the LED light decay that the temperature of rising causes has a strong impact on its life-span, especially the electrolytic capacitor of the output filter of rectifier bridge is worked approximately 5000 ~ 8000 hours its life-span under the strong attitude of high temperature in switch power source driving circuit, just becomes the bottleneck of restriction LED lamp life.
The LED light source average life span is not less than 50,000 hours, is no more than 8000 hours with the supporting switch drive power source life of LED light source on market, can't mate with LED light source; Because the conversion efficiency of Switching Power Supply is lower, will increase the generation of driving power self heat simultaneously, further improve the lamp system temperature rise, aggravation LED light decay.
The utility model content
The purpose of this utility model is to provide a kind of good stability, reliability is high, cost the is low pulse-width modulation type LED lamp drive circuit with current protection ability.
The purpose of this utility model is to realize like this, pulse-width modulation type LED lamp drive circuit with current protection ability, it is characterized in that: comprise the control valve that is connected on load circuit, the control valve base stage is connected with constant-current circuit, and load circuit two ends are serially connected on the positive-negative output end of power supply E; Serial connection current-limiting resistance R1 and voltage-stabiliser tube Dw between the positive-negative output end of described power supply E, the stable DC voltage of current-limiting resistance R1 and the output of voltage-stabiliser tube Dw tie point is connected to the power end of constant-current circuit by resistance R 2, the other end of constant-current circuit is electrically connected to the control valve base stage; Feedback resistance R4 is arranged between the negative output terminal of control valve emitter and power supply E; feedback resistance R4 is electrically connected to the base stage of control valve emitter electric connection point with protection triode T2, and the collector and emitter of protection triode T2 is serially connected between the negative output terminal of control valve base stage and power supply E.
Between the negative output terminal of described control valve base stage and power supply E, shunt resistance R3 is arranged, shunt resistance R3 is used for the electric current that the control load loop is passed through.
Described power supply E is the output after AC rectification.
The load of described load circuit is the LED light source that series connection or connection in series-parallel connect.
Described voltage-stabiliser tube Dw is between 3-12v.
Operation principle of the present utility model and characteristics are: by controlling duty ratio, allow LED be operated in the current state of an instantaneous variation, shorten conduction time in the unit interval, utilize the transient response characteristic of LED and the hysteresis effect of human eye sensitization; The pulse frequency of this Power Management Design is 100HZ, and duty ratio is variable, the peak---the peak pulse electric current is greater than 2A; Thereby realized that great power LED exchanges driving and inactivity heat radiation.It has the LED long-life: circuit is comprised of semiconductor device and resistance, has reduced to affect the devices such as electrochemical capacitor in life-span, has guaranteed the long-life of driving power, life-span 〉=50000 of driving power hour.
High efficiency: power supply conversion efficiency is high, and loss power own is just little, can reduce in the light fixture internal heat generation, is conducive to reduce lamp temperatures, power supply conversion efficiency 〉=90%.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Fig. 1 is the utility model embodiment circuit theory diagrams.
In figure: 1, load circuit; 2, control valve; 3, constant-current circuit; 4, LED light source.
Embodiment
Referring to Fig. 1, the purpose of this utility model is to realize like this, pulse-width modulation type LED lamp drive circuit with current protection ability, it is characterized in that: comprise the control valve 2 that is connected on load circuit 1, control valve 2 base stages are connected with constant-current circuit 3, and load circuit 1 two ends are serially connected on the positive-negative output end of power supply E; Serial connection current-limiting resistance R1 and voltage-stabiliser tube Dw between the positive-negative output end of described power supply E, the stable DC voltage of current-limiting resistance R1 and the output of voltage-stabiliser tube Dw tie point is connected to the power end of constant-current circuit 3 by resistance R 2, the other end of constant-current circuit 3 is electrically connected to control valve 2 base stages; Between the negative output terminal of control valve 2 emitters and power supply E, feedback resistance R4 is arranged; feedback resistance R4 is electrically connected to the base stage of control valve 2 emitter electric connection points with protection triode T2, and the collector and emitter of protection triode T2 is serially connected between the negative output terminal of control valve 2 base stages and power supply E.
Between the negative output terminal of control valve 2 base stages and power supply E, shunt resistance R3 is arranged, shunt resistance R3 is used for the electric current that the control load loop is passed through.
Power supply E is the output after AC rectification.
The load of load circuit is the LED light source 4 that series connection or connection in series-parallel connect.
Voltage-stabiliser tube Dw is between 3-12v.
After AC rectification without filter capacitor, alternating current self-assembling formation light pulse by 100Hz, the LED that series connection or connection in series-parallel are connected is operated under the pulse high current environment, by controlling duty ratio, allow LED be operated in the current state of an instantaneous variation, shorten conduction time in the unit interval, utilize the transient response characteristic of LED and the hysteresis effect of human eye sensitization; The pulse frequency of this Power Management Design is 100HZ, and duty ratio is variable, the peak---the peak pulse electric current is greater than 2A; Thereby realized that great power LED exchanges driving and inactivity heat radiation.
Claims (5)
1. have the pulse-width modulation type LED lamp drive circuit of current protection ability, it is characterized in that: comprise the control valve that is connected on load circuit, the control valve base stage is connected with constant-current circuit, and load circuit two ends are serially connected on the positive-negative output end of power supply E; Serial connection current-limiting resistance R1 and voltage-stabiliser tube Dw between the positive-negative output end of described power supply E, the stable DC voltage of current-limiting resistance R1 and the output of voltage-stabiliser tube Dw tie point is connected to the power end of constant-current circuit by resistance R 2, the other end of constant-current circuit is electrically connected to the control valve base stage; Feedback resistance R4 is arranged between the negative output terminal of control valve emitter and power supply E; feedback resistance R4 is electrically connected to the base stage of control valve emitter electric connection point with protection triode T2, and the collector and emitter of protection triode T2 is serially connected between the negative output terminal of control valve base stage and power supply E.
2. the pulse-width modulation type LED lamp drive circuit with current protection ability according to claim 1; it is characterized in that: between the negative output terminal of described control valve base stage and power supply E, shunt resistance R3 is arranged, shunt resistance R3 is used for the electric current that the control load loop is passed through.
3. the pulse-width modulation type LED lamp drive circuit with current protection ability according to claim 1, it is characterized in that: described power supply E is the output after AC rectification.
4. the pulse-width modulation type LED lamp drive circuit with current protection ability according to claim 1 is characterized in that: the load of described load circuit is the LED light source that series connection or connection in series-parallel connect.
5. the pulse-width modulation type LED lamp drive circuit with current protection ability according to claim 1, it is characterized in that: described voltage-stabiliser tube Dw is between 3-12v.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220512017 CN202931607U (en) | 2012-10-08 | 2012-10-08 | Pulse width modulation type LED (Light-Emitting Diode) lamp driving circuit with current protection capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220512017 CN202931607U (en) | 2012-10-08 | 2012-10-08 | Pulse width modulation type LED (Light-Emitting Diode) lamp driving circuit with current protection capability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202931607U true CN202931607U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220512017 Expired - Fee Related CN202931607U (en) | 2012-10-08 | 2012-10-08 | Pulse width modulation type LED (Light-Emitting Diode) lamp driving circuit with current protection capability |
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| Country | Link |
|---|---|
| CN (1) | CN202931607U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141615A (en) * | 2014-07-30 | 2014-11-12 | 苏州淮通电气有限公司 | Submersible pump giving alarm to water leakage |
-
2012
- 2012-10-08 CN CN 201220512017 patent/CN202931607U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141615A (en) * | 2014-07-30 | 2014-11-12 | 苏州淮通电气有限公司 | Submersible pump giving alarm to water leakage |
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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: 20130508 Termination date: 20151008 |
|
| EXPY | Termination of patent right or utility model |