CN101616519A - Constant-voltage LED illumination circuit - Google Patents
Constant-voltage LED illumination circuit Download PDFInfo
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- CN101616519A CN101616519A CN200910038124A CN200910038124A CN101616519A CN 101616519 A CN101616519 A CN 101616519A CN 200910038124 A CN200910038124 A CN 200910038124A CN 200910038124 A CN200910038124 A CN 200910038124A CN 101616519 A CN101616519 A CN 101616519A
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Abstract
The invention discloses the constant-voltage LED illumination circuit that a kind of cost is lower, simple in structure, efficient is high, low in energy consumption, energy-conservation.The present invention includes rectification circuit (1), voltage stabilizing circuit (2), LED load (3), the described LED load (3) of flowing through behind the direct current of alternating current through become the high pressure constant voltage after described rectification circuit (1) rectification from the output of the output of described voltage stabilizing circuit (2), described voltage stabilizing circuit (2) is a Switching Power Supply, described voltage stabilizing circuit (2) comprises circuit of power factor correction (IC1), described LED load (3) comprises at least one group of several LED that are in series, and each organizes between described several LED that are in series the output that parallel connection more directly is connected to described voltage stabilizing circuit (2).The present invention can be widely used in LED lighting circuit field.
Description
Technical field
The present invention relates to a kind of constant-voltage LED illumination circuit.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Existing led drive circuit generally all is by current stabilization or voltage stabilizing circuit are set LED to be carried out drive controlling.In the application of LED light fixture especially LED street lamp, the illumination driving circuit of each producer adopts the Switching Power Supply scheme mostly, voltage is generally between 24～48V, because the power of street lamp is bigger, generally more than 120W, therefore to use many group Switching Power Supplies simultaneously, this can cause with high costs, the average power consumption of Switching Power Supply itself loss simultaneously is about 15～20%, and the energy consumption of the LED street lamp waste 15～20% of this just feasible originally energy-conservation province consumption makes energy-saving effect have a greatly reduced quality.Fig. 1 is a kind of existing isolation type switching power supply voltage stabilizing circuit, so-called " isolated " is meant that the earth terminal of the both sides of transformer is independently, the voltage of the power output end of sort circuit is lower, the LED limited amount of series connection, therefore to use many group Switching Power Supplies to export simultaneously, this can cause the circuit complexity, the line trouble, and cost is higher.Fig. 2 is a kind of existing non-isolated power supply constant-current circuit, though sort circuit can guarantee the current stabilization of output, but under the situation of a plurality of load parallel connections, then can cause the inequality of electric current in each branch road to distribute, so that after a paths of LEDs burns, quicken to cause all burning of a paths of LEDs easily.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and the constant-voltage LED illumination circuit that a kind of cost is lower, simple in structure, efficient is high, low in energy consumption, energy-conservation is provided.
The technical solution adopted in the present invention is: the present invention includes rectification circuit, voltage stabilizing circuit, LED load, the described LED load of flowing through behind the direct current of alternating current through become the high pressure constant voltage after the described rectification circuit rectification from the output of the output of described voltage stabilizing circuit, described voltage stabilizing circuit is a Switching Power Supply, described voltage stabilizing circuit comprises circuit of power factor correction, described LED load comprises at least one group of several LED that are in series, and each organizes the output that directly is connected to described voltage stabilizing circuit in parallel again between described several LED that are in series.
Described constant-voltage LED illumination circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit is connected between the input and described rectification circuit of AC power.
Described rectification circuit adopts bridge rectifier.
The invention has the beneficial effects as follows: owing to the present invention includes rectification circuit, voltage stabilizing circuit, the LED load, the described LED load of flowing through behind the direct current of alternating current through become the high pressure constant voltage after the described rectification circuit rectification from the output of the output of described voltage stabilizing circuit, described voltage stabilizing circuit is a Switching Power Supply, described voltage stabilizing circuit comprises circuit of power factor correction IC, described LED load comprises at least one group of several LED that are in series, each organizes the output that directly is connected to described voltage stabilizing circuit in parallel again between described several LED that are in series, by described rectification circuit, described voltage stabilizing circuit obtains stable high tension voltage output, and at least one group of several LED that are in series directly are connected to the output of described voltage stabilizing circuit, many group Switching Power Supplies have been avoided using, make circuit element significantly reduce, circuit is simple, and cost is lower.In addition, described voltage stabilizing circuit comprises circuit of power factor correction, makes that circuit is simple, efficient is high, can provide the output of the stable high-voltage power supply of voltage to described LED load, so cost of the present invention is lower, simple in structure, efficient is high, low in energy consumption, energy-conservation.
Description of drawings
Fig. 1 is a kind of schematic diagram of existing isolation type switching power supply voltage stabilizing circuit;
Fig. 2 is a kind of schematic diagram of existing non-isolated power supply constant-current circuit;
Fig. 3 is the circuit diagram of the embodiment of the invention one;
Fig. 4 is the circuit diagram of the embodiment of the invention two.
Embodiment
Embodiment one:
As shown in Figure 3; the constant-voltage LED illumination circuit of present embodiment comprises rectification circuit 1; voltage stabilizing circuit 2; LED load 3; short-circuit protection circuit 5; the described LED load 3 of flowing through behind the direct current of alternating current through become the high pressure constant voltage after described rectification circuit 1 rectification from the output of the output of described voltage stabilizing circuit 2; described rectification circuit 1 adopts by four rectifier diode D1; D2; D3; the bridge rectifier that D4 forms; described short-circuit protection circuit 5 comprises fuse F1 and piezo-resistance RV1; be used for overcurrent and short-circuit protection; be connected between the input and described rectification circuit 1 of AC power; described voltage stabilizing circuit 2 is Switching Power Supplies; described voltage stabilizing circuit 2 comprises circuit of power factor correction IC1; the model that described circuit of power factor correction IC1 adopts ST company to produce is the power supply PFC power factor control circuit of L6561; it is simple that it has a circuit; the efficient advantages of higher; its power factor can reach more than 98% when normal pressure 220V; be widely used at present in the power circuit of required power factor correctings such as electricity-saving lamp; its peripheral cell comprises six capacitor C 1～C6; 11 resistance R 1～R9; R1 '; R9 '; three diode D5～D7; a metal-oxide-semiconductor Q1; an inductance coil T1; described LED load 3 comprises one group of 121 LED that are in series; this organizes the output that directly is connected to described voltage stabilizing circuit 2 after described 121 LED are in series; the quantity of the described LED that is in series should be looked the voltage V of the output of described voltage stabilizing circuit 2
0And the conducting voltage V of average each described LED
FAnd decide, so the number of described LED approximates V
0/ V
F, in the present embodiment, the output end voltage V of described voltage stabilizing circuit 2
0=400V, the conducting voltage V of each described LED
F=3.3V, then the number of LED described in the present embodiment is V
0/ V
F=121.
Embodiment two:
As shown in Figure 4, the difference of present embodiment and embodiment one is: the described load 3 of present embodiment comprises four groups of LED that are in series, the quantity of every group of described LED is 121, respectively organizes between the described LED output that directly is connected to described voltage stabilizing circuit 2 in parallel after the series connection again.In the present embodiment, the quantity Calculation mode of the every group of described LED that contacts mutually is identical with embodiment one.
All the other features of present embodiment are with embodiment one.
The present invention by described rectification circuit 1 rectification after through with obtaining stable high tension voltage output after described voltage stabilizing circuit 2 frequency modulation of described circuit of power factor correction IC1 or the pulsewidth adjustment, and at least one group of several LED that are in series directly are connected to the output of described voltage stabilizing circuit 2, avoided using many group Switching Power Supplies low-voltage (24～48V), high electric current (1～3A) drive scheme, be a kind of brand-new high voltage (about 400V), low current (0.3～0.5A) drive scheme, make circuit element significantly reduce, circuit is simple, and cost is lower.In addition, described voltage stabilizing circuit 2 comprises circuit of power factor correction IC1, makes that circuit is simple, efficient is high, and its effective power greater than 92%, can provide voltage stable high-voltage power supply output to described LED load 3 when normal pressure 220V.
The present invention can be widely used in LED lighting circuit field.
Claims (3)
1, a kind of constant-voltage LED illumination circuit, it is characterized in that: comprise rectification circuit (1), voltage stabilizing circuit (2), LED load (3), the described LED load (3) of flowing through behind the direct current of alternating current through become the high pressure constant voltage after described rectification circuit (1) rectification from the output of the output of described voltage stabilizing circuit (2), described voltage stabilizing circuit (2) is a Switching Power Supply, described voltage stabilizing circuit (2) comprises circuit of power factor correction (IC1), described LED load (3) comprises at least one group of several LED that are in series, and each organizes between described several LED that are in series the output that parallel connection more directly is connected to described voltage stabilizing circuit (2).
2, constant-voltage LED illumination circuit according to claim 1 is characterized in that: described constant-voltage LED illumination circuit also comprises short-circuit protection circuit (5), and described short-circuit protection circuit (5) is connected between the input and described rectification circuit (1) of AC power.
3, constant-voltage LED illumination circuit according to claim 1 is characterized in that: described rectification circuit (1) adopts bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910038124A CN101616519A (en) | 2009-03-23 | 2009-03-23 | Constant-voltage LED illumination circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910038124A CN101616519A (en) | 2009-03-23 | 2009-03-23 | Constant-voltage LED illumination circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101616519A true CN101616519A (en) | 2009-12-30 |
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ID=41495818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910038124A Pending CN101616519A (en) | 2009-03-23 | 2009-03-23 | Constant-voltage LED illumination circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909390A (en) * | 2010-07-30 | 2010-12-08 | 深圳市桑达实业股份有限公司 | Constant-voltage power circuit with power factor correction (PFC) and light-emitting diode (LED) street lamp |
| CN102083261A (en) * | 2011-01-19 | 2011-06-01 | 上海欣丰电子有限公司 | Drive circuit for LED (Light-Emitting Diode) lamp |
| CN110534055A (en) * | 2019-08-29 | 2019-12-03 | 广东美的制冷设备有限公司 | Display panel of air-conditioner and air conditioner |
-
2009
- 2009-03-23 CN CN200910038124A patent/CN101616519A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909390A (en) * | 2010-07-30 | 2010-12-08 | 深圳市桑达实业股份有限公司 | Constant-voltage power circuit with power factor correction (PFC) and light-emitting diode (LED) street lamp |
| CN101909390B (en) * | 2010-07-30 | 2013-06-19 | 深圳市桑达实业股份有限公司 | Constant-voltage power circuit with power factor correction (PFC) and light-emitting diode (LED) street lamp |
| CN102083261A (en) * | 2011-01-19 | 2011-06-01 | 上海欣丰电子有限公司 | Drive circuit for LED (Light-Emitting Diode) lamp |
| CN102083261B (en) * | 2011-01-19 | 2013-09-11 | 上海欣丰电子有限公司 | Drive circuit for LED (Light-Emitting Diode) lamp |
| CN110534055A (en) * | 2019-08-29 | 2019-12-03 | 广东美的制冷设备有限公司 | Display panel of air-conditioner and air conditioner |
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Application publication date: 20091230 |