CN102647831A - LED (Light Emitting Diode) driving circuit with long service life - Google Patents
LED (Light Emitting Diode) driving circuit with long service life Download PDFInfo
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- CN102647831A CN102647831A CN2012100813722A CN201210081372A CN102647831A CN 102647831 A CN102647831 A CN 102647831A CN 2012100813722 A CN2012100813722 A CN 2012100813722A CN 201210081372 A CN201210081372 A CN 201210081372A CN 102647831 A CN102647831 A CN 102647831A
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Abstract
The invention relates to an LED (Light Emitting Diode) driving circuit with long service life, which comprises a rectifying filtering module, a power control module, an isolating system module, a low-voltage high-frequency output module and a voltage-stabilizing constant current module, wherein a current in an external mains supply circuit firstly enters into the rectifying filtering module; the current is rectified and filtered by the rectifying filtering module; and then the current enters into the power control module; the power of the rectifying filtering module is controlled within a rated range by the power control module; the current enters into the isolating system module, and then enters into the low-voltage high-frequency output module; the voltage of the current is stabilized by the low-voltage high-frequency output module; and then the current enters into the voltage-stabilizing constant current module; the current is processed into the constant current by the voltage-stabilizing constant current module; and lastly, the current is transmitted to an LED load by the voltage-stabilizing constant current module.
Description
Technical field
The present invention relates to a kind of drive circuit, be meant a kind of led drive circuit that comprises rectification filtering module, power control module, shielding system module, low pressure high frequency output module and pressure-stabilizing constant flow module especially in order to the driving LED load.
Background technology
As everyone knows; The LED driving power is to convert the power supply supply into specific electric current and voltage with the luminous electric pressure converter of driving LED; Generally, the input of LED driving power comprises high pressure industrial frequency AC (being civil power), low-voltage direct, HVDC, low pressure high-frequency ac (like the output of electronic transformer) etc.The output of LED driving power is then most of for changing the constant current source that change voltage with LED forward voltage drop value.
The LED driving power is extremely important in the process of concrete practice, because the luminous efficiency of LED descends along with the rising of LED temperature, so the heat radiation of LED is extremely important.The efficient of power supply is high, and its dissipation power is little, and is just little in light fixture internal heat generation amount, also just reduced the temperature rise of light fixture.Light decay to delaying LED is favourable.
The compact LED lamp that is circulated in the market is owing to receive limiting of cost and driving power partial design to have only one to two year its useful life.Concrete reason is that the design of circuit receives the restriction of material cost and makes performance lower on the one hand; Be to come filtering with electrochemical capacitor on the one hand in addition; And can only reach 5000-8000 hour the useful life of electrochemical capacitor, therefore present LED does not have very long useful life.
Some expensive goods that occur now can prolong some but also be unable to do without electrochemical capacitor useful life, and line design is complicated, and cost is higher relatively to be difficult to market and to accept.And this is the major defect for conventional art.
Summary of the invention
The present invention provides a kind of long-life led drive circuit, and its integrated circuit is simply safe and reliable, can reduce the production cost of led drive circuit greatly, and this is to be main purpose of the present invention.
The technical scheme that the present invention taked is: a kind of long-life led drive circuit; It comprises rectification filtering module, power control module, shielding system module, low pressure high frequency output module and pressure-stabilizing constant flow module; Wherein, Outside mains circuit is connected with this rectification filtering module, and the LED load is connected with this pressure-stabilizing constant flow module.
This power control module is electrically connected with this rectification filtering module; This shielding system module is electrically connected with this power control module; This low pressure high frequency output module is electrically connected with this shielding system module; This pressure-stabilizing constant flow module is electrically connected with this low pressure high frequency output module, and this rectification filtering module, this power control module, this shielding system module, this low pressure high frequency output module and this pressure-stabilizing constant flow module are connected in series successively.
Electric current in the outside mains circuit at first enters into this rectification filtering module, by this rectification filtering module electric current is carried out rectifying and wave-filtering, and this rectification filtering module adopts the form of no electrolytic capacitor filtering that electric current is carried out rectifying and wave-filtering.
Electric current in practical implementation in the outside mains circuit is the electric current of 220V, 20KHZ; This rectification filtering module comprises rectification module, filtration module and resonant circuit module; Electric current gets into successively in this rectification module, this filtration module and this resonant circuit module and carries out rectifying and wave-filtering; This resonant circuit module is a half-bridge oscillation circuit; This resonant circuit module converts electric current into high-frequency current by low-frequency current, thereby does not produce the vision of flicker when making the lamp pearl of this LED load luminous, can make resonant inductance reduce the volume conserve space simultaneously again and practice thrift cost; Externally the electric current in the mains circuit is under the situation of 220V, 20KHZ, is converted into the electric current of 20KHZ by this resonant circuit module.
Get in this power control module through the electric current behind this rectification filtering module rectifying and wave-filtering; This power control module is controlled at the power of this rectification filtering module within the rated range; Make the effectively stable operation of this rectification filtering module; Specifically describe to the power of this power control module with this resonant circuit module is controlled within the rated range, make the effectively stable operation of this resonant circuit module.
Electric current by this power control module output enters into this shielding system module; This shielding system module comprises resonant inductance; The high-pressure section and the low pressure output that will get into the electric current of this shielding system module through this resonant inductance are isolated; Thereby the high-pressure section of electric current is isolated out; With reach avoid high-pressure section output to the hurtful effect of LED load, the high-pressure section of electric current is isolated out can prevent that the person from receiving the electric shock of high-tension electricity simultaneously, thus the fail safe of agents enhance overall circuit and reliability.
Electric current by this shielding system module output enters into this low pressure high frequency output module; Through this low pressure high frequency output module electric current is carried out voltage stabilizing; Make final LED load obtain a stable power voltage, make its influence that does not receive the voltage height, thus stable work.
Electric current by this low pressure high frequency output module output enters into this pressure-stabilizing constant flow module; By this pressure-stabilizing constant flow module electric current is carried out constant current; And finally give the LED load with current delivery by this pressure-stabilizing constant flow module, this pressure-stabilizing constant flow module makes the LED loaded work piece have the function of not being afraid of short circuit at constant state.
Beneficial effect of the present invention is: comparing drives 1W of the present invention has very significantly beneficial effect with the drive circuit of conventional art to the LED of 15W and compared with techniques in the past, and first cost is low and reliable and stable.It two is thereby that a complete set of circuit design does not exist electrochemical capacitor to get rid of electrochemical capacitor to be prone to withered disadvantage, and the resonant circuit of mature and reliable and voltage-stabilizing system can be with the 2-4 that brings up to existing product its useful life doubly in addition.Thereby make the product that utilizes technology of the present invention to produce have comparatively ideal long-life and practicality.
The present invention adopts the easy purchase cost of common raw materials on the market lower in practical implementation fully in addition, and the cost of a complete set of circuit has only the cost of the common energy-saving lamp circuit of a 9W, can practice thrift 60% with existing product comparison on the market.Product of the present invention makes it reach the effect of high stable extra long life with brand-new design.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is the circuit block diagram of rectification filtering module of the present invention.
Embodiment
Shown in Fig. 1 to 2, a kind of long-life led drive circuit, it comprises rectification filtering module 10, power control module 20, shielding system module 30, low pressure high frequency output module 40 and pressure-stabilizing constant flow module 50.Wherein, outside mains circuit is connected with this rectification filtering module 10, and the LED load is connected with this pressure-stabilizing constant flow module 50.
This power control module 20 is electrically connected with this rectification filtering module 10; This shielding system module 30 is electrically connected with this power control module 20; This low pressure high frequency output module 40 is electrically connected with this shielding system module 30, and this pressure-stabilizing constant flow module 50 is electrically connected with this low pressure high frequency output module 40.This rectification filtering module 10, this power control module 20, this shielding system module 30, this low pressure high frequency output module 40 and this pressure-stabilizing constant flow module 50 are connected in series successively.
Electric current in the outside mains circuit at first enters into this rectification filtering module 10, carries out rectifying and wave-filtering by 10 pairs of electric currents of this rectification filtering module.This rectification filtering module 10 adopts the form of no electrolytic capacitor filtering that electric current is carried out rectifying and wave-filtering.Electric current in practical implementation in the outside mains circuit is the electric current of 220V, 20KHZ.This rectification filtering module 10 comprises rectification module 11, filtration module 12 and resonant circuit module 13, and electric current gets into successively in this rectification module 11, this filtration module 12 and this resonant circuit module 13 and carries out rectifying and wave-filtering.
This resonant circuit module 13 is a half-bridge oscillation circuit.This resonant circuit module 13 converts electric current into high-frequency current by low-frequency current, thereby does not produce the vision of flicker when making the lamp pearl of this LED load luminous, can make resonant inductance reduce the volume conserve space simultaneously again and practice thrift cost.Externally the electric current in the mains circuit is under the situation of 220V, 20KHZ, is converted into the electric current of 20KHZ by this resonant circuit module 13.
Get in this power control module 20 through the electric current behind these rectification filtering module 10 rectifying and wave-filterings.This power control module 20 is controlled at the power of this rectification filtering module 10 within the rated range, makes this rectification filtering module 10 effective stable operations.Specifically describe to the power of this power control module 20 with this resonant circuit module 13 is controlled within the rated range, make this resonant circuit module 13 effective stable operations.
Electric current by these power control module 20 outputs enters into this shielding system module 30.This shielding system module 30 comprises resonant inductance; The high-pressure section and the low pressure output that will get into the electric current of this shielding system module 30 through this resonant inductance are isolated; Thereby the high-pressure section of electric current is isolated out, with reach avoid high-pressure section output to the hurtful effect of LED load.Simultaneously the high-pressure section of electric current is isolated out and can prevent that the person from receiving the electric shock of high-tension electricity, thus the fail safe of agents enhance overall circuit and reliability.
Electric current by these shielding system module 30 outputs enters into this low pressure high frequency output module 40.Carry out voltage stabilizing through 40 pairs of electric currents of this low pressure high frequency output module, make final LED load obtain a stable power voltage, make its influence that does not receive the voltage height, thus stable work.
Electric current by these low pressure high frequency output module 40 outputs enters into this pressure-stabilizing constant flow module 50.Carry out constant current by 50 pairs of electric currents of this pressure-stabilizing constant flow module, and finally give the LED load with current delivery by this pressure-stabilizing constant flow module 50.This pressure-stabilizing constant flow module 50 makes the LED loaded work piece have the function of not being afraid of short circuit at constant state.
Claims (4)
1. long-life led drive circuit; It is characterized in that: it comprises rectification filtering module, power control module, shielding system module, low pressure high frequency output module and pressure-stabilizing constant flow module; Wherein, outside mains circuit is connected with this rectification filtering module, and the LED load is connected with this pressure-stabilizing constant flow module; This power control module is electrically connected with this rectification filtering module; This shielding system module is electrically connected with this power control module, and this low pressure high frequency output module is electrically connected with this shielding system module, and this pressure-stabilizing constant flow module is electrically connected with this low pressure high frequency output module; This rectification filtering module, this power control module, this shielding system module, this low pressure high frequency output module and this pressure-stabilizing constant flow module are connected in series successively
Electric current in the outside mains circuit at first enters into this rectification filtering module; By this rectification filtering module electric current is carried out rectifying and wave-filtering; Get in this power control module through the electric current behind this rectification filtering module rectifying and wave-filtering; Electric current by this power control module output enters into this shielding system module, and this shielding system module comprises resonant inductance, and the electric current of being exported by this shielding system module enters into this low pressure high frequency output module; Electric current by this low pressure high frequency output module output enters into this pressure-stabilizing constant flow module, gives the LED load by this pressure-stabilizing constant flow module with current delivery.
2. a kind of long-life led drive circuit as claimed in claim 1; It is characterized in that: this rectification filtering module comprises rectification module, filtration module and resonant circuit module; Electric current gets in this rectification module, this filtration module and this resonant circuit module successively, and this rectification module, this filtration module and this resonant circuit module are connected in series successively.
3. a kind of long-life led drive circuit as claimed in claim 2 is characterized in that: this resonant circuit module is a half-bridge oscillation circuit.
4. a kind of long-life led drive circuit as claimed in claim 3 is characterized in that: the electric current in the outside mains circuit is the electric current of 220V, 20KHZ, and this resonant circuit module is converted into the electric current of 20KHZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100813722A CN102647831A (en) | 2012-03-26 | 2012-03-26 | LED (Light Emitting Diode) driving circuit with long service life |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100813722A CN102647831A (en) | 2012-03-26 | 2012-03-26 | LED (Light Emitting Diode) driving circuit with long service life |
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| CN102647831A true CN102647831A (en) | 2012-08-22 |
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| CN2012100813722A Pending CN102647831A (en) | 2012-03-26 | 2012-03-26 | LED (Light Emitting Diode) driving circuit with long service life |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108449831A (en) * | 2018-03-14 | 2018-08-24 | 福州大学 | A kind of High Power Factor long-life LED drive power and control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030107540A1 (en) * | 2001-12-12 | 2003-06-12 | Yew-Peng Kee | LCD with power conversion capability |
| CN101347046A (en) * | 2005-11-22 | 2009-01-14 | 奥斯兰姆有限公司 | A led driving arrangement |
| CN101668369A (en) * | 2009-10-01 | 2010-03-10 | 英飞特电子（杭州）有限公司 | High-efficiency constant-current LED driver |
-
2012
- 2012-03-26 CN CN2012100813722A patent/CN102647831A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030107540A1 (en) * | 2001-12-12 | 2003-06-12 | Yew-Peng Kee | LCD with power conversion capability |
| CN101347046A (en) * | 2005-11-22 | 2009-01-14 | 奥斯兰姆有限公司 | A led driving arrangement |
| CN101668369A (en) * | 2009-10-01 | 2010-03-10 | 英飞特电子（杭州）有限公司 | High-efficiency constant-current LED driver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108449831A (en) * | 2018-03-14 | 2018-08-24 | 福州大学 | A kind of High Power Factor long-life LED drive power and control method |
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Application publication date: 20120822 |