CN202183895U - Constant current driving system for LED lamp - Google Patents
Constant current driving system for LED lamp Download PDFInfo
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- CN202183895U CN202183895U CN2011202355039U CN201120235503U CN202183895U CN 202183895 U CN202183895 U CN 202183895U CN 2011202355039 U CN2011202355039 U CN 2011202355039U CN 201120235503 U CN201120235503 U CN 201120235503U CN 202183895 U CN202183895 U CN 202183895U
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Abstract
Provided is a constant current driving system for an LED lamp. The constant current driving system comprises a voltage doubling rectifying circuit and a constant current control circuit, wherein the input end of the voltage doubling rectifying circuit is connected with a DC input voltage or an AC input voltage via an LC circuit; the LC circuit comprises an inductor L and a capacitor C1, with one end of the inductor L being connected with the input voltage while the other end of the inductor L being connected with a first input end of the voltage doubling rectifying circuit; the capacitor C1 is connected between the first input end and the second input end of the voltage doubling rectifying circuit in parallel; and the output end of the voltage doubling rectifying circuit is connected with the input end of the constant current control circuit. The constant current driving system of the utility model employs few components to optimize the inputting power supply and is capable of efficiently matching the input of an electronic transformer, reducing the stress of multiplied voltage, protecting the rear circuit, improving the loading capability of the system, and making the operation of the electronic transformer be securer and more stable. The constant current driving system of the utility model features small size, low cost, and high efficiency and is particularly applicable to small sized LED lamps having the input of over 3W.
Description
Technical field
The utility model relates to a kind of input is supplied power and is optimized the electronic circuit of adjusting, relates in particular to a kind of constant-current driving system that realizes small size, low cost, the high efficiency LED of applying to lamp.
Background technology
The existing constant-current driving system that is used on the LED lamp adopts buck circuit more, and electronic transformer power supply or direct current supply are adopted in its input power supply.When adopting the electronic transformer power supply, especially in the input power utilization greater than 3W, the power supply of electronic transformer can drop to and is not enough to the voltage that provides enough, power output is descended even makes the LED lamp produce flicker.
In order to tackle the phenomenon that power output descends even produces flicker, adopt strengthened input filter capacitor more, but big filter capacitor can cause big input pulse electric current, thereby increases the weight of the load of electronic transformer, makes electronic transformer move towards fast to lose efficacy.
Power output descends even produce the phenomenon of flicker in order to tackle, and also has to adopt the boost type circuit, make continuous input current, but the voltage after boosting is higher, and the size phase strain of filter capacitor is big, and control circuit is complicated.
Summary of the invention
The utility model mainly solves the constant-current driving system on the original LED of being used in lamp, the technical problem that adopts buck circuit power output is descended even the generation of LED lamp is glimmered; The increasing input filter capacitor can increase the weight of the load of electronic transformer, makes electronic transformer move towards the technical problem that lost efficacy fast; Adopt the boost type circuit, the size phase strain of filter capacitor is big, and control circuit is also than the complicated technology problem; A kind of constant-current driving system of the LED of applying to lamp is provided, realizes forming series resonance, thereby change the operating state of electronic transformer, reduce input current, improve input power factor, make electronic transformer work safer more stable with electronic transformer.
Another purpose of the utility model provides a kind of constant-current driving system of the LED of applying to lamp, and it can mate the input of electronic transformer efficiently, automatic compatible AC and DC power supply input; The elevator system load capacity; With considerably less components and parts the input power supply is optimized adjusting, volume is little, and cost is low; Efficient is high, is fit to very much be applied in the LED lamp of small size.
The another purpose of the utility model provides a kind of constant-current driving system of the LED of applying to lamp, and it has suitably reduced the voltage stress after the multiplication of voltage, makes the output voltage of voltage doubling rectifing circuit be able to restriction, the protection late-class circuit.
The above-mentioned technical problem of the utility model mainly is able to solve through following technical proposals: the utility model comprises voltage doubling rectifing circuit and constant-current control circuit; The output of voltage doubling rectifing circuit links to each other with the input of constant-current control circuit; The input of described voltage doubling rectifing circuit links to each other with DC input voitage or AC-input voltage through a lc circuit; Described lc circuit comprises inductance L and capacitor C 1; One end of inductance L links to each other with input voltage, and the other end of inductance L links to each other with the first input end of described voltage doubling rectifing circuit, and capacitor C 1 is connected in parallel between the first input end and second input of described voltage doubling rectifing circuit.The access of inductance L and capacitor C 1 is not for filtering adds, but through adjusting the parameter of inductance L and capacitor C 1; Make voltage doubling rectifing circuit to form series resonance with electronic transformer; Thereby reach the coupling that changes condition of resonance optimization and electronic transformer, make it to mate work better, reduce input current with constant-current control circuit; Improve the input power factor of this drive system; It is safer, more stable that electronic transformer work is got, and can play certain filter action simultaneously, kills two birds with one stone.
As preferably; Described voltage doubling rectifing circuit comprises capacitor C 2, capacitor C 3, electrochemical capacitor C4 and diode D1, diode D2, diode D3, diode D4; The negative pole of the positive pole of diode D1 and diode D2 also connects; Also contact is as the first input end of voltage doubling rectifing circuit; Be parallel with series circuit and the electrochemical capacitor C4 of series circuit, diode D3 and the diode D4 of capacitor C 2 and capacitor C 3 between the positive pole of the negative pole of diode D1 and diode D2, and the negative pole of the negative pole of diode D3 and diode D1 links to each other, the positive pole of diode D4 links to each other with the positive pole of diode D2; The also contact of capacitor C 2 and capacitor C 3 links to each other with the also contact of diode D3 and diode D4; This tie point is as second input of voltage doubling rectifing circuit, and the positive pole of electrochemical capacitor C4 is as the positive pole of the output of voltage doubling rectifing circuit, and the negative pole of electrochemical capacitor C4 is as the negative pole of the output of voltage doubling rectifing circuit.The input of voltage doubling rectifing circuit is optimized adjusting through voltage doubling rectifing circuit to the input power supply by ac-powered or by the electronic transformer power supply.When the input AC electricity is positive half cycle; Diode D1 and diode D4 conducting; Diode D2 and diode D3 end; The power supply input is to capacitor C 2 and electrochemical capacitor C4 charging; Being charged to the peak value
of effective value (be doubly) of power supply input; And be that output provides energy; When the input AC electricity converts negative half period into; Diode D1 and diode D4 end, diode D2 and diode D3 conducting, and the power supply input is to capacitor C 3 and electrochemical capacitor C4 charging; Being charged to the peak value
of effective value (be doubly) of power supply input; And, pass through after several cycles the voltage same polarity stack on capacitor C 2, the capacitor C 3 like this for output provides energy; Electrochemical capacitor C4 go up the output voltage maximum be exactly 2 times of power supply input peak value (be effective value 2
doubly); Because the appearance value of electrochemical capacitor C4 is much larger than the appearance value of capacitor C 2 and capacitor C 3, thereby when realizing voltage-doubler rectification, promoted the stability of supply power voltage significantly.Equally, when system be input as direct current supply the time, when last when negative just down; Diode D1 and diode D4 conducting, diode D2 and diode D3 end, and the power supply input is to capacitor C 2 and electrochemical capacitor C4 charging; (just go up when bearing instantly, diode D1 and diode D4 end, diode D2 and diode D3 conducting to arrive input voltage value; Power supply is imported capacitor C 3 and electrochemical capacitor C4 charging, arrives input voltage value), thus realize the compatibility that AC and DC is supplied power.The utility model can mate the input of electronic transformer, elevator system load capacity efficiently.The used components and parts of the utility model are considerably less, and volume can be accomplished very little, and cost is low, and efficient is high, is fit to very much be applied in the LED lamp of small size, reaches the requirement of small size, high effect.
As preferably; Be connected with resistance R 1 between the negative pole of the positive pole of described diode D3 and diode D4; The positive pole of diode D4 links to each other through the negative pole of the output of resistance R 2 and voltage doubling rectifing circuit; The also contact of the negative pole of resistance R 1 and diode D4 links to each other with the also contact of capacitor C 2 and capacitor C 3, and this tie point is as second input of voltage doubling rectifing circuit.Sealing in of resistance R 1 and resistance R 2 makes the output voltage of voltage doubling rectifing circuit be able to restriction, thereby reduces the voltage stress of constant-current control circuit, the protection late-class circuit.
The beneficial effect of the utility model is: with considerably less components and parts the input power supply is optimized adjusting; The input that can mate electronic transformer efficiently, automatic compatible AC and DC power supply input has suitably reduced the voltage stress after the multiplication of voltage; Make the output voltage of voltage doubling rectifing circuit be able to restriction; The protection late-class circuit, the elevator system load capacity makes electronic transformer work safer more stable.The utility model volume is little, and cost is low, and efficient is high, is fit to very much be applied in the LED lamp of the small size of importing greater than 3W, guarantees normal, the efficient operation of LED lamp.
Description of drawings
Fig. 1 is a kind of circuit theory diagrams of the utility model embodiment 1.
Fig. 2 is a kind of circuit theory diagrams of the utility model embodiment 2.
Fig. 3 is a kind of three-dimensional decomposition texture sketch map with the LED lamp of the utility model coupling.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically the technical scheme of the utility model.
Embodiment 1: the constant-current driving system that applies to the LED lamp of present embodiment; As shown in Figure 1; Comprise lc circuit 3, voltage doubling rectifing circuit 1 and constant-current control circuit 2; The input of voltage doubling rectifing circuit 1 links to each other with electronic transformer through lc circuit, also can link to each other with DC input voitage or AC-input voltage.Lc circuit 3 comprises inductance L and capacitor C 1, and an end of inductance L links to each other with input voltage, and the other end of inductance L links to each other with the first input end of voltage doubling rectifing circuit 1, and capacitor C 1 is connected in parallel between the first input end and second input of voltage doubling rectifing circuit 1.In the present embodiment, voltage doubling rectifing circuit 1 comprises capacitor C 2, capacitor C 3, electrochemical capacitor C4 and diode D1, diode D2, diode D3, diode D4.The negative pole of the positive pole of diode D1 and diode D2 also connects; Also contact is as the first input end of voltage doubling rectifing circuit 1; Be parallel with series circuit and the electrochemical capacitor C4 of series circuit, diode D3 and the diode D4 of capacitor C 2 and capacitor C 3 between the positive pole of the negative pole of diode D1 and diode D2; And the anodal of the negative pole of diode D3, electrochemical capacitor C4 all links to each other with the negative pole of diode D1; The negative pole of the positive pole of diode D4, electrochemical capacitor C4 all links to each other with the positive pole of diode D2; The also contact of capacitor C 2 and capacitor C 3 links to each other with the also contact of diode D3 and diode D4, and this tie point is as second input of voltage doubling rectifing circuit 1, and the positive pole of electrochemical capacitor C4 is as the positive pole of the output of voltage doubling rectifing circuit 1; The negative pole of electrochemical capacitor C4 is as the negative pole of the output of voltage doubling rectifing circuit 1, and the output of voltage doubling rectifing circuit 1 links to each other with the input of constant-current control circuit 2.
Embodiment 2: the constant-current driving system that applies to the LED lamp of present embodiment; As shown in Figure 2; Comprise lc circuit 3, voltage doubling rectifing circuit 1 and constant-current control circuit 2; The input of voltage doubling rectifing circuit 1 links to each other with electronic transformer through lc circuit 3, also can link to each other with DC input voitage or AC-input voltage.In voltage doubling rectifing circuit 1; Be connected with resistance R 1 between the negative pole of the positive pole of diode D3 and diode D4; The positive pole of diode D4 links to each other through the negative pole of resistance R 2 with the output of voltage doubling rectifing circuit 1; The also contact of the negative pole of resistance R 1 and diode D4 links to each other with the also contact of capacitor C 2 and capacitor C 3, and this tie point is as second input of voltage doubling rectifing circuit 1.All the other structures are with embodiment 1.
The constant-current driving system that applies to the LED lamp of present embodiment is installed in the LED lamp of small size, and is as shown in Figure 3, and this LED lamp comprises main casing 3, power storehouse 4 and three LED lamp pearls 5.Aluminium base 6 is installed in the main casing 3; Three LED lamp pearls 5 are installed on the aluminium base 6, are covered with 7, three lens 7 of lens on each LED lamp pearl 5 accordingly and are installed in a transparent baffle 8 back; There are three installation feet 9 at the back side of transparent baffle 8; Installation foot 9 links to each other with aluminium base 6, and the front end clamping of transparent baffle 8 and main casing 3 has louvre on the transparent baffle 8.Power storehouse 4 is connected the rear end of main casing 3; The power module 10 of the constant-current driving system that applies to the LED lamp that comprises present embodiment is installed in the power storehouse 4; The afterbody of power storehouse 4 is equipped with conductive pin 11; Conductive pin 11 is electrically connected with power module 10, and power module 10 is electrically connected with LED lamp pearl 5 again.The periphery of main casing 3 is evenly equipped with the fin that a lot of sheets axially are provided with, and the periphery of the fin that forms a circle is with a circle centring ring 12.
The course of work: link to each other with extraneous power supply through conductive pin.When the input of system is supplied power by ac-powered or through the electronic transformer on the power module, the input power supply is optimized adjusting through voltage doubling rectifing circuit.When the input AC electricity is positive half cycle; Diode D1 and diode D4 conducting; Diode D2 and diode D3 end; The power supply input is to capacitor C 2 and electrochemical capacitor C4 charging; Being charged to the peak value
of effective value (be doubly) of power supply input; And for output provides energy, when the input AC electricity converted negative half period into, diode D1 and diode D4 ended; Diode D2 and diode D3 conducting; Power supply input is to capacitor C 3 and electrochemical capacitor C4 charging, being charged to the peak value
of effective value (be doubly) of power supply input, and energy is provided for output; Like this through after several cycles; The stack of voltage same polarity on capacitor C 2, the capacitor C 3, electrochemical capacitor C4 go up the output voltage maximum be exactly 2 times of power supply input peak value (be effective value 2
doubly), because the appearance value of electrochemical capacitor C4 is much larger than the appearance value of capacitor C 2 and capacitor C 3; Thereby when realizing voltage-doubler rectification, promoted the stability of supply power voltage significantly.Equally, when system be input as direct current supply the time, when last when negative just down; Diode D1 and diode D4 conducting, diode D2 and diode D3 end, and the power supply input is to capacitor C 2 and electrochemical capacitor C4 charging; (just go up when bearing instantly, diode D1 and diode D4 end, diode D2 and diode D3 conducting to arrive input voltage value; Power supply is imported capacitor C 3 and electrochemical capacitor C4 charging, arrives input voltage value), thus realize the compatibility that AC and DC is supplied power.
Claims (3)
1. constant-current driving system that applies to the LED lamp; Comprise voltage doubling rectifing circuit (1) and constant-current control circuit (2); The output of voltage doubling rectifing circuit (1) links to each other with the input of constant-current control circuit (2); The input that it is characterized in that described voltage doubling rectifing circuit (1) links to each other with DC input voitage or AC-input voltage through a lc circuit (3); Described lc circuit (3) comprises inductance L and capacitor C 1; One end of inductance L links to each other with input voltage, and the other end of inductance L links to each other with the first input end of described voltage doubling rectifing circuit (1), and capacitor C 1 is connected in parallel between the first input end and second input of described voltage doubling rectifing circuit (1).
2. the constant-current driving system that applies to the LED lamp according to claim 1; It is characterized in that described voltage doubling rectifing circuit (1) comprises capacitor C 2, capacitor C 3, electrochemical capacitor C4 and diode D1, diode D2, diode D3, diode D4; The negative pole of the positive pole of diode D1 and diode D2 also connects; Also contact is as the first input end of voltage doubling rectifing circuit (1); Be parallel with series circuit and the electrochemical capacitor C4 of series circuit, diode D3 and the diode D4 of capacitor C 2 and capacitor C 3 between the positive pole of the negative pole of diode D1 and diode D2; And the negative pole of diode D3 links to each other with the negative pole of diode D1; The positive pole of diode D4 links to each other with the positive pole of diode D2, and the also contact of capacitor C 2 and capacitor C 3 links to each other with the also contact of diode D3 and diode D4, and this tie point is as second input of voltage doubling rectifing circuit (1); The positive pole of electrochemical capacitor C4 is as the positive pole of the output of voltage doubling rectifing circuit (1), and the negative pole of electrochemical capacitor C4 is as the negative pole of the output of voltage doubling rectifing circuit (1).
3. the constant-current driving system that applies to the LED lamp according to claim 2; It is characterized in that being connected with resistance R 1 between the negative pole of positive pole and diode D4 of described diode D3; The positive pole of diode D4 links to each other through the negative pole of resistance R 2 with the output of voltage doubling rectifing circuit (1); The also contact of the negative pole of resistance R 1 and diode D4 links to each other with the also contact of capacitor C 2 and capacitor C 3, and this tie point is as second input of voltage doubling rectifing circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202355039U CN202183895U (en) | 2011-07-06 | 2011-07-06 | Constant current driving system for LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202355039U CN202183895U (en) | 2011-07-06 | 2011-07-06 | Constant current driving system for LED lamp |
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| Publication Number | Publication Date |
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| CN202183895U true CN202183895U (en) | 2012-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202355039U Expired - Lifetime CN202183895U (en) | 2011-07-06 | 2011-07-06 | Constant current driving system for LED lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368881A (en) * | 2011-07-06 | 2012-03-07 | 晋宝电气（浙江）有限公司 | Constant current driving system used for LED lamp |
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2011
- 2011-07-06 CN CN2011202355039U patent/CN202183895U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368881A (en) * | 2011-07-06 | 2012-03-07 | 晋宝电气（浙江）有限公司 | Constant current driving system used for LED lamp |
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Granted publication date: 20120404 |
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| CX01 | Expiry of patent term |