CN204629195U - Current-limiting type LED high-voltage light bar - Google Patents
Current-limiting type LED high-voltage light bar Download PDFInfo
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- CN204629195U CN204629195U CN201520317509.9U CN201520317509U CN204629195U CN 204629195 U CN204629195 U CN 204629195U CN 201520317509 U CN201520317509 U CN 201520317509U CN 204629195 U CN204629195 U CN 204629195U
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Abstract
The utility model discloses a kind of current-limiting type LED high-voltage light bar; comprise multiple LED, current-limiting resistance, constant current chip and protective resistance; LED is connected with current-limiting resistance; constant current chip is connected mutually and each protective resistance is in parallel with each constant current chip respectively; constant current chip series connection after output mutually connect with LED and current-limiting resistance after cathode terminal be connected; constant current chip series connection after logically ground connection, LED mutually connect with current-limiting resistance after anode terminal for being connected with the positive pole behind commercial power rectification.Compared with prior art, the utility model current-limiting type LED high-voltage light bar carries out overvoltage and current-limiting protection by multiple constant current chip of connecting and a small amount of current-limiting resistance of connecting with LED to LED, improves light efficiency and the service life of LED high-voltage light bar.
Description
Technical field
The utility model relates to LED technical field, relates to a kind of current-limiting type LED high-voltage light bar more specifically.
Background technology
Existing LED high-voltage light bar generally comprises the LED of multiple series connection and the current-limiting resistance of a large amount of little resistance; when adopting constant voltage to drive; each current-limiting resistance of connecting with LED plays current-limiting protection effect; but a large amount of current-limiting resistances can convert electric energy to heat energy while current limliting; cause energy loss, thus reduce light efficiency.
Simultaneously, LED high-voltage light bar generally can only be operated in the voltage range of 200-230VAC, and China's civil power can reach 180-264VAC, there is larger fluctuation range, thus when civil power fluctuates between 230-264VAC, overtension can damage LED high-voltage light bar, greatly reduces the service life of LED.For solving this problem, special constant-current can be used to drive, but LED special constant-current IC is when single application, require higher to the resistance to pressure of LED special constant-current IC, make the cost of LED special constant-current IC higher, and when using for many, the situation that unbalanced-voltage-division is even can be there is, and then the LED special constant-current IC causing dividing potential drop large damages because of excessive heating.
Therefore, be badly in need of providing that a kind of light efficiency is high, current-limiting type LED high-voltage light bar that the life-span is long to be to overcome above-mentioned defect.
Utility model content
The purpose of this utility model is to provide a kind of current-limiting type LED high-voltage light bar, to realize current limliting and the overvoltage protection of LED high-voltage light bar, and improves light efficiency and the service life of LED high-voltage light bar.
For achieving the above object, the utility model provides a kind of current-limiting type LED high-voltage light bar, comprise multiple LED, current-limiting resistance, constant current chip and protective resistance, described LED is connected with described current-limiting resistance, described constant current chip is connected mutually and each described protective resistance is in parallel with each described constant current chip respectively, output after the series connection of described constant current chip mutually connect with described LED and described current-limiting resistance after cathode terminal be connected, logically ground connection after described constant current chip series connection, described LED mutually connect with described current-limiting resistance after anode terminal for being connected with the positive pole behind commercial power rectification.
Compared with prior art, the utility model current-limiting type LED high-voltage light bar comprises multiple LED, current-limiting resistance, constant current chip and protective resistance, wherein LED is connected with current-limiting resistance, constant current chip is connected mutually and each protective resistance is in parallel with each constant current chip respectively, constant current chip series connection after output mutually connect with LED and current-limiting resistance after cathode terminal be connected, LED mutually connect with current-limiting resistance after anode terminal for being connected with the positive pole behind commercial power rectification, when the line voltage accessed is lower, the electric current flowed through in each LED is less, if electric current is less than the constant current value of constant current chip, then now constant current chip is equivalent to short circuit, the protective resistance in parallel with constant current chip also short circuit, thus the resistance be connected in current-limiting type LED high-voltage light bar loop is less, now the light efficiency of LED high-voltage light bar is higher, and when civil power raises, the ER effect flowed through in each LED is large, if be greater than the constant current value of constant current chip, then constant current chip provides constraints to electric current, it is made to remain constant current value, and civil power raises and will the voltage at constant current chip two ends be caused to raise, now protective resistance is started working, electric current is had to pass through in protective resistance, because the resistance be connected in current-limiting type LED high-voltage light bar loop increases, electric current during voltage rise in each LED obtains restriction, and while having electric current to flow through in protective resistance, the electric current flowed through in each LED and current-limiting resistance is also increasing, the dividing potential drop of current-limiting resistance is also increased, the pressure drop of each LED can reduce further, thus the overvoltage protection achieved current-limiting type LED high-voltage light bar, improve the service life of LED.
Preferably, the quantity of described constant current chip and described protective resistance is 4, and the constant current value of each described constant current chip is identical.
Preferably, described LED high-voltage light bar is the line lamp of 8 to 15 mm wides.
Preferably, the drive circuit of described current-limiting type LED high-voltage light bar comprises fuse, piezo-resistance and bridge rectifier, one end of described fuse is connected with the live wire of described civil power, the other end of described fuse is connected with the positive input terminal of described piezo-resistance and described bridge rectifier, the negative input end of described bridge rectifier is connected with the zero line of described civil power, between the zero line that described piezo-resistance is parallel to described civil power and live wire.
Preferably, described drive circuit is integrated in described current-limiting type LED high-voltage light bar.
By following description also by reference to the accompanying drawings, the utility model will become more clear, and these accompanying drawings are for explaining embodiment of the present utility model.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model current-limiting type LED high-voltage light bar one embodiment.
Detailed description of the invention
With reference now to accompanying drawing, describe embodiment of the present utility model, element numbers similar in accompanying drawing represents similar element.
Please refer to Fig. 1, the utility model current-limiting type LED high-voltage light bar 100 comprises multiple LED D1 ~ Dn, multiple current-limiting resistance R1 ~ Rm, multiple constant current chip U0 and multiple protective resistance R0, wherein LED D1 ~ Dn connects with current-limiting resistance R1 ~ Rm, constant current chip U0 connects mutually and each protective resistance R0 is in parallel with each constant current chip U0 respectively, constant current chip U0 connect after output mutually connect with LED D1 ~ Dn and current-limiting resistance R1 ~ Rm after cathode terminal be connected, logically ground connection after constant current chip U0 connects, anode terminal after LED D1 ~ Dn connects mutually with current-limiting resistance R1 ~ Rm is for being connected with the positive pole after civil power AC rectification.
Wherein, when LED D1 ~ Dn connects with current-limiting resistance R1 ~ Rm, can be connected in series with the current-limiting resistance R1 ~ Rm mutually connected after LED D1 ~ Dn directly connects, also can be that each LED D1 ~ Dn intersects with current-limiting resistance R1 ~ Rm and is connected in series again.Preferably, LED D1 in the present embodiment ~ Dn intersects with current-limiting resistance R1 ~ Rm and is connected in series (as shown in Figure 1).In addition, as shown in Figure 1, in the present embodiment, the quantity of constant current chip U0 and protective resistance R0 is 4, and the constant current value (rated value) of each constant current chip U0 is identical, and the quantity of certain constant current chip U0 is not restricted to this.
Please refer to Fig. 1 again, the drive circuit 200 of current-limiting type LED high-voltage light bar 100 comprises fuse F, piezo-resistance ZV and bridge rectifier, one end of fuse F is connected with the live wire AC_L of civil power AC, the other end of fuse F is connected with the positive input terminal of piezo-resistance ZV and bridge rectifier, the negative input end of bridge rectifier is connected with the zero line AC_N of civil power AC, and piezo-resistance ZV is parallel between the zero line AC_N of civil power AC and live wire AC_L.In addition, drive circuit 200 can be integrated in current-limiting type LED high-voltage light bar 200, thus current-limiting type LED high-voltage light bar 100 gets final product work after directly connecting civil power, certainly, drive circuit 200 also can as independently a part of, during use, the input access civil power of drive circuit 200, output is connected with current-limiting type LED high-voltage light bar 100.
It should be noted that, constant current chip U0 is LED drived control special circuit, if model is the constant current chip of TM1810.
The operation principle of the utility model current-limiting type LED high-voltage light bar 100 is described in detail below in conjunction with Fig. 1:
After access civil power AC, bridge rectifier carries out rectification to civil power AC, city's electric drive current-limiting type LED high-voltage light bar 100 after rectification, wherein when civil power AC fluctuates between 180 ~ 264VAC, the civil power fluctuation range after rectification is 254-373V (magnitude of voltage of the civil power after rectification is that the civil power before rectification is multiplied by 1.414);
When civil power AC lower (as lower than 230VAC), the electric current flowed through in current-limiting type LED high-voltage light bar 100 is less, if when electric current is less than the constant current value of constant current chip U0, then constant current chip U0 is equivalent to short circuit, protective resistance R0 also short circuit in parallel with it, the resistance be now connected in current-limiting type LED high-voltage light bar 100 loop is less, thus the light efficiency of current-limiting type LED high-voltage light bar 100 is higher, and because now electric current is less, therefore there is not electric current excessive and damage the problem of LED;
When civil power raises (as higher than 230VAC), the ER effect flowed through in current-limiting type LED high-voltage light bar 100 is large, if electric current is greater than the constant current value of constant current chip U0, then constant current chip U0 provides constraints to electric current, it is made to remain constant current value (rated value), now due to the current constant of constant current chip U0 and civil power (input voltage) raise, raise causing the voltage at constant current chip U0 two ends, so time protective resistance R0 start working, electric current is had to pass through in protective resistance R0, protective resistance R0 work increases causing the resistance be connected in current-limiting type LED high-voltage light bar 100, the resistance increased can provide constraints by the electric current of convection current in each LED during voltage rise, and while having electric current to flow through in protective resistance R0, the electric current flowed through in each LED and current-limiting resistance is also increasing, the dividing potential drop of current-limiting resistance is also increased, the pressure drop of each LED can reduce further, thus the overvoltage protection achieved current-limiting type LED high-voltage light bar 100, make current-limiting type LED high-voltage light bar 100 can be applicable to the civil power input of 180 ~ 264VAC.
Compared with prior art, the utility model has the following advantages:
(1) each LED can be made to be operated within the scope of safe current by constant current chip U0 current limliting, the service life of LED is extended greatly, and the use of constant current chip U0, the quantity of current-limiting resistance in existing LED high-voltage light bar can be reduced;
(2) when voltage is higher than certain value, protective resistance R0 accesses in LED high-voltage light bar 100, when voltage is lower than certain value, protective resistance R0 short circuit, namely changes the resistance of access in current-limiting type LED high-voltage light bar 100 along with line voltage change, achieve when voltage is lower, to connect less resistance in current-limiting type LED high-voltage light bar 100, thus the energy of resistance consumption is less, improves the light efficiency of current-limiting type LED high-voltage light bar 100, and technique is simple, cost is low; In addition, change the resistance of access in current-limiting type LED high-voltage light bar 100 along with line voltage change, make current-limiting type LED high-voltage light bar 100 better can adapt to the change of input voltage, be really applicable to the civil power input of 180-264VAC;
(3) on constant current chip U0, protective resistance R0 in parallel can protect constant current chip U0, makes constant current chip U0 avoid burning because of unbalanced-voltage-division; Multiple constant current chip U0 series connection use can make low pressure constant current chip in high-tension circuit, reduce cost, simplify circuit, and multiple constant current chip U0 disperses heat radiation, improves stability.
In addition, in the present embodiment, current-limiting type LED high-voltage light bar 100 is the line lamp of 8 to 15 mm wides, easy to use, and can disperse heat radiation, and product stability is high.
More than in conjunction with most preferred embodiment, the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contain various carry out according to essence of the present utility model amendment, equivalent combinations.
Claims (5)
1. a current-limiting type LED high-voltage light bar, it is characterized in that, comprise multiple LED, current-limiting resistance, constant current chip and protective resistance, described LED is connected with described current-limiting resistance, described constant current chip is connected mutually and each described protective resistance is in parallel with each described constant current chip respectively, output after the series connection of described constant current chip mutually connect with described LED and described current-limiting resistance after cathode terminal be connected, logically ground connection after described constant current chip series connection, described LED mutually connect with described current-limiting resistance after anode terminal for being connected with the positive pole behind commercial power rectification.
2. current-limiting type LED high-voltage light bar as claimed in claim 1, it is characterized in that, the quantity of described constant current chip and described protective resistance is 4, and the constant current value of each described constant current chip is identical.
3. current-limiting type LED high-voltage light bar as claimed in claim 1, it is characterized in that, described LED high-voltage light bar is the line lamp of 8 to 15 mm wides.
4. current-limiting type LED high-voltage light bar as claimed in claim 1, it is characterized in that, the drive circuit of described current-limiting type LED high-voltage light bar comprises fuse, piezo-resistance and bridge rectifier, one end of described fuse is connected with the live wire of described civil power, the other end of described fuse is connected with the positive input terminal of described piezo-resistance and described bridge rectifier, the negative input end of described bridge rectifier is connected with the zero line of described civil power, between the zero line that described piezo-resistance is parallel to described civil power and live wire.
5. current-limiting type LED high-voltage light bar as claimed in claim 4, it is characterized in that, described drive circuit is integrated in described current-limiting type LED high-voltage light bar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520317509.9U CN204629195U (en) | 2015-05-15 | 2015-05-15 | Current-limiting type LED high-voltage light bar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520317509.9U CN204629195U (en) | 2015-05-15 | 2015-05-15 | Current-limiting type LED high-voltage light bar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071961A (en) * | 2017-01-18 | 2017-08-18 | 中山市美耐特光电有限公司 | It is a kind of effectively to weaken the high-voltage LED light bar of stroboscopic phenomenon |
| EP3799530A1 (en) | 2019-09-24 | 2021-03-31 | Jürgen Wambach | Lighting device for an elevator shaft with emergency lighting function |
| CN113966034A (en) * | 2021-11-02 | 2022-01-21 | 上海南麟电子股份有限公司 | LED system |
-
2015
- 2015-05-15 CN CN201520317509.9U patent/CN204629195U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071961A (en) * | 2017-01-18 | 2017-08-18 | 中山市美耐特光电有限公司 | It is a kind of effectively to weaken the high-voltage LED light bar of stroboscopic phenomenon |
| EP3799530A1 (en) | 2019-09-24 | 2021-03-31 | Jürgen Wambach | Lighting device for an elevator shaft with emergency lighting function |
| CN113966034A (en) * | 2021-11-02 | 2022-01-21 | 上海南麟电子股份有限公司 | LED system |
| CN113966034B (en) * | 2021-11-02 | 2023-10-03 | 上海南麟电子股份有限公司 | LED system |
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