CN203827554U - LED lamp control circuit employing LPC technology - Google Patents
LED lamp control circuit employing LPC technology Download PDFInfo
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- CN203827554U CN203827554U CN201420026050.2U CN201420026050U CN203827554U CN 203827554 U CN203827554 U CN 203827554U CN 201420026050 U CN201420026050 U CN 201420026050U CN 203827554 U CN203827554 U CN 203827554U
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- light source
- led light
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to the technical field of illumination and provides an LED lamp control circuit employing an LPC technology. An NTC thermistor is connected to an input terminal of an alternating current N in series for decreasing a starting inrush current. A CBB capacitor is connected to a DC terminal of a rectifier bridge in parallel for replacing an electrolytic capacitor to achieve effects of filtering and freewheeling. A PR temperature-controlling combination is employed for connecting to a LED light source module group in series to form a controlled LED light source. Because the electrolytic capacitor is replaced by the CBB capacitor and only a few of simple and reliable capacitance-resistance elements are employed, the LED light source module group is achieved to be controlled in a temperature and a current. Reliability and service life of the LED light source module group is effectively improved. Meanwhile, the control circuit has two good social benefits: (1) a power factor compensation effect is achieved invisibly, and furthermore, is in a form of capacitive terminal compensation which is good in effect; (2) with the controlling method in the utility model, a low-voltage terminal is not controlled and an electricity consumption peak and an electricity-snatching measure in a low-voltage period are not encouraged. Meanwhile, with the controlling method being free from controlling the low-voltage terminal, a light-dimming process can be conveniently carried out with various light dimmers, further reducing the electricity consumption.
Description
Technical field
The utility model relates to lighting technical field, is a kind of LED lamp control circuit of the LPC of employing technology.
Background technology
At present, existing known LED lamp control mode is to adopt constant-current source driver control substantially, and first it will be direct current by alternating current 220V rectification, and another mistake becomes high-frequency ac, by driving LED light sources such as high frequency transformation, rectification again, filtering, constant currents.Therefore the complexity coefficient of drive circuit and power consumption are relatively high.Or adopting current regulator diode control mode, its circuit is simple, reliable.But reach the required series connection progression of rated voltage, (at least) first two rear string, realize reliability requirement again, just has to adopt low-power LED chip, thereby increased by a relatively large margin cost.Or adopt resistance-capacitance depressurization control mode, and its circuit is simple, and cost is low.But the controlled effect of its high terminal voltage is poor, and will adopt electrochemical capacitor, and therefore reliability and life-span are relatively low.
Summary of the invention
The technical solution of the utility model is: utilize the relative uniformity of LED chip VF value, design, the first also rear string of making, the LED lamp source module of setting one fixed working voltage.Design, employing PPT (positive temperature coefficient) thermistor and thresholding resistance, regulation and control LED light source is in operating current and the temperature of high-pressure side.Use CBB capacitor to realize dividing potential drop, filtering and afterflow effect.LPC technology adopts L: the LED light source module of setting operating voltage; P:PTC thermistor; C: dividing potential drop, filtering and continued flow capacitor; Form the technical scheme of controlled LED light source.
Implementation method: first according to the requirement design of the rated operational voltage of LED lamp and rated power, making LED light source module.As a rated operational voltage 220V, the LED Down lamp of rated power 16W, the series connection progression computing formula of its module LED chip is: (overall presure drop under rated operational voltage ÷ 2 × direct current equivalence ratio-PTC thermistor normal temperature) ÷ LED chip VF value=progression of connecting.Wherein: rated operational voltage ÷ 2 provides more satisfactory pressure drop interval for capacitor partial pressure properties.Direct current equivalence is than being: 1.14.Chip selection VF value: 3.1V (nominal value: 3.0-3.2).Under PTC thermistor normal temperature, stagnation pressure is reduced to: 2V.Calculating series connection progression is: 40.According to first two and after the reliability requirement of string, after the 2835 chip parallel combinations that every grade is selected two 0.2W, then 40 grades of full strings form LED lamp source modules.
Require controlled upper bound current value according to LED Down lamp: the equivalence of chip rated power × number × direct current in parallel is than ÷ chip VF value × 105%=0.154A.Its chips rated power: 0.2W, direct current equivalence ratio: 1.14, VF value: 3.1V, controlled upper limit current ratio: 105%.Select 60 DEG C of Curie temperature according to upper bound current value, starting current 0.15A, the PTC thermistor of normal temperature pressure drop 0.6V, in parallel with 100 Ω thresholding resistance, form PR temperature control combination, its maximal pressure depreciation is: upper bound current value × thresholding resistance value × 65% (contributive rate of resistance value after started by PPTC thermistor)=10V.Adopt three full strings of temperature control combination, controlled high terminal voltage 30V, then connect with LED lamp source module, just form controlled LED light source.The parallel combination that seals in CBB2.5 μ/400V voltage-dividing capacitor and 470K discharge resistance at interchange input L end, reduces the pressure drop of LED light source end.Seal in NTC negative tempperature coefficient thermistor at interchange input N end, resistance 500 Ω under normal temperature, 10～15 Ω after warm start, weaken to open and shove.At DC terminal CBB1 μ/400V filtering in parallel of rectifier bridge and the parallel combination of continued flow capacitor and 470K discharge resistance.Ensure stable dividing potential drop, filtering and the afterflow effect of capacitor.
While work under normal temperature and rated voltage, the pressure drop of PTC thermistor is in 0.6V left and right, and PR temperature control combination does not start, now Energy Efficiency Ratio (light source power/input power) >=98%.When ambient temperature or supply power voltage rising, Current rise in controlled LED light source, rises on PTC thermistor internal temperature, resistance, pressure drop, and PR temperature control combination starts step by step, increases dividing potential drop.Thereupon, on temperature controlled light source, electric current, power decline, and tend to balance, and are protected.Otherwise, temperature, voltage drop, PR temperature control combination is closed step by step, is again returned to high energy efficiency state.
The utility model is to be made up of institutes such as NTC thermistor, voltage-dividing capacitor, discharge resistance, rectifier bridge, filtering and continued flow capacitor, LED chip, PTC thermistors.It is characterized in that: adopt NTC thermistor to seal in and exchange N input, weaken to open and shove, at the DC terminal CBB capacitor in parallel of rectifier bridge, replace electrolytic capacitor and realize filtering, afterflow effect, adopt PR temperature control combination, with LED light source module in series controlled LED light source.
Owing to adopting CBB capacitor to replace electrolytic capacitor, and only adopt a small amount of simple and reliable Resistor-Capacitor Unit, just realized the control to LED light source module temperature current.Effectively raise reliability and the useful life of LED light source module, reduced by a relatively large margin production cost and the complexity coefficient of LED lamp.Adopt the LED lamp of this control mode simultaneously, brought again two good social benefits: the one, virtually play power factor compensation effect, and be the good capacitive end compensation of effect.The 2nd, this control mode is not controlled low-pressure end, does not encourage peak of power consumption, " the robbing electric measure " when low-voltage.This control mode of not controlling low-pressure end, can adopt again various dimmer for light control easily simultaneously, further electrical energy saving.
Brief description of the drawings
Accompanying drawing 1 is the LED lamp control circuit figure of a kind of LPC of employing technology of the utility model.
Wherein 1, NTC thermistor, 2, discharge resistance, 3, voltage-dividing capacitor, 4, rectifier bridge, 5, filtering capacitor, 6, LED light source module, 7, PTC thermistor, 8, thresholding resistance.
Embodiment
Embodiment is manufactured experimently a rated operational voltage 220V, the LED Down lamp of rated power 16W, accompanying drawing 1 is its circuit diagram, first adopt NTC thermistor (1) to seal in and exchange N input, resistance 500 Ω under its normal temperature, 10～15 Ω after warm start, play and weaken the effect of shoving of opening.Adopt the parallel combination of CBB2.5 μ/400V voltage-dividing capacitor (3) and 470K discharge resistance (2), seal in and exchange L input, reduce the pressure drop of LED light source end.Adopt 0.8A/1000V rectifier bridge (4) that direct current supply is provided.At DC terminal CBB1 μ/400V filtering capacitor in parallel (5) of rectifier bridge and the parallel combination of 470K discharge resistance, ensure stable dividing potential drop, filtering and the afterflow effect of capacitor.The series connection progression computing formula of LED light source (6) chip is: (overall presure drop under rated operational voltage ÷ 2 × direct current equivalence ratio-PTC thermistor normal temperature) ÷ LED chip VF value=progression of connecting.Wherein direct current equivalence ratio: 1.14; Chip selection VF value: 3.1V (nominal value: 3.0～3.2); Every grade adopts the parallel combination of two 0.2W2835 chips; Overall presure drop: 2V under PTC thermistor normal temperature.Calculate series connection progression: 40; According to first two and after the reliability requirement of string, after the 2835 chip parallel combinations that every grade is selected two 0.2W, then 40 grades of full strings form LED lamp source modules.Then select 60 DEG C of Curie temperature according to upper bound current value, starting current 0.15A, the PTC thermistor of normal temperature pressure drop 0.6V, in parallel with 100 Ω thresholding resistance, form PR temperature control combination, its maximal pressure depreciation is: upper bound current value × thresholding resistance value × 65% (contributive rate of resistance value after started by PPTC thermistor)=10V.Adopt three full strings of temperature control combination, controlled high terminal voltage 30V, then connect with LED lamp source module, just form controlled LED light source.
While work under normal temperature and rated voltage, the pressure drop of PTC thermistor is in 0.6V left and right, and PR temperature control combination does not start, now Energy Efficiency Ratio (light source power/input power) >=98%.When ambient temperature or supply power voltage rising, Current rise in controlled LED light source, rises on PTC thermistor internal temperature, resistance, pressure drop, and PR temperature control combination starts step by step, increases dividing potential drop.Thereupon, on temperature controlled light source, electric current, power decline, and tend to balance, and are protected.Otherwise, temperature, voltage drop, PR temperature control combination is closed step by step, is again returned to high energy efficiency state.
Claims (1)
1. one kind adopts the LED lamp control circuit of LPC technology, it is made up of NTC thermistor, voltage-dividing capacitor, discharge resistance, rectifier bridge, CBB capacitor, LED chip, PTC thermistor, it is characterized in that: adopt NTC thermistor to seal in ac input end, weaken to open and shove, at the DC terminal CBB capacitor in parallel of rectifier bridge, replace electrolytic capacitor and realize filtering, afterflow effect, adopt PR temperature control combination, with LED light source module in series controlled LED light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420026050.2U CN203827554U (en) | 2014-01-14 | 2014-01-14 | LED lamp control circuit employing LPC technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420026050.2U CN203827554U (en) | 2014-01-14 | 2014-01-14 | LED lamp control circuit employing LPC technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203827554U true CN203827554U (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420026050.2U Expired - Fee Related CN203827554U (en) | 2014-01-14 | 2014-01-14 | LED lamp control circuit employing LPC technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203827554U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617389A (en) * | 2019-01-28 | 2019-04-12 | 湖南晟和电源科技有限公司 | I type specially gets higher power factor power circuit, method of supplying power to and its measuring instrument |
| TWI823430B (en) * | 2022-06-17 | 2023-11-21 | 國立中央大學 | Anti-blue light leakage led circuit structure with active thermal fuse |
-
2014
- 2014-01-14 CN CN201420026050.2U patent/CN203827554U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617389A (en) * | 2019-01-28 | 2019-04-12 | 湖南晟和电源科技有限公司 | I type specially gets higher power factor power circuit, method of supplying power to and its measuring instrument |
| TWI823430B (en) * | 2022-06-17 | 2023-11-21 | 國立中央大學 | Anti-blue light leakage led circuit structure with active thermal fuse |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20170114 |