LED Surge Protection
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LED Surge Protection

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Brief Introduction to Lightning Protection of LED Engineering Lights


With the global trend of energy saving and emission reduction, LED technology is constantly innovating; from traditional incandescent lamps to energy-saving lamps with some electronic powder coated on the filament, to current LED energy-saving lamps; major semiconductor manufacturers in the world are constantly improving LED Device energy consumption, service life, heat dissipation and other technologies; In fact, the damage of the entire LED lighting system is mainly the damage of the driver, and in reality many manufacturers seem to consider the stability of the driving power supply insufficiently!

LED energy-saving products have been widely used in industrial plant lighting, urban landscape, urban lighting, advertising lighting outside the window, tunnel lighting and so on! Our company combined many project experiences and made some brief introduction to the current protection of LED drive power:


Standards: IEC61000-4-5 / GB/T17626.5

Comprehensive wave 8/20US 1.25/50US Low power grid source impedance, using equivalent input 2Ω

Test Level:

Leve

Open circuit test voltage +10%

1

0.5KV

2 1KV
3 2KV
4 4KV
5 10KV or 100KV(Mountainous or Forest Area)
Outdoor Lighting


Features: The working environment of the outdoor lighting system is very harsh, and it is easy to be affected by lightning surges, the maintenance cost for the damage of the drive power source is very high.

Electrical characteristics: Requires a wide input voltage range, high constant current accuracy, and small current fluctuations.

Drive power (including constant

current or constant voltage)

Suggested Options
100W ≤ P ≤ 300W

Option1

50W ≤ P ≤ 100W Option 1、 Option 2

15W ≤ P ≤ 50W

Option 2、 Option 3

5W ≤ P ≤15W

Option 2、Option 3、Option 4

Option 1
Advantages

It uses common and differential mode protection, and is connected in series with the discharge tube on the common differential mode line. There is no leakage current under normal conditions, and the service life of the MOV will be extended. Generally, when the MOV is found to be failure, it is an open circuit or burst. There are also special circumstances, when the MOV is short-circuited, the discharge tube will open circuit to protect the circuit, otherwise it will cause the circuit bus to trip.

It is connected in series with a NTC that suppresses inrush current. This is helpful for absorbing  inrush current when the power switch (ON / OFF) is switched, reducing the occurrence of electric sparks during the switching process, and making the constant current accuracy higher and more stable. It is also conducive to extending the device life of the rectifier voltage regulator circuit in the subsequent stage. 

Disadvantages

 Relatively high cost, taking up some space.


Option 2
Advantages

Average cost performance, it uses differential mode protection, and is connected in series with the discharge tube on the differential mode line; under normal circumstances, there is no leakage current between the LN lines, and it will also extend the life of the MOV. This plan can be applied in the projects without PE protective ground wire.

It is connected in series with a NTC that suppresses inrush current. This is helpful for absorbing inrush current when the power switch (ON / OFF) is switched, reducing the occurrence of electric sparks during the switching process, and making the constant current accuracy higher and more stable. It is also conducive to extending the life cycle of the rectifier voltage regulator circuit devices in the subsequent stage.

Disadvantages 

The surge voltage is only absorbed by the device, and there is no ground for proper discharge of energy






Option 3
Advantages

High cost performance, it uses differential mode protection, only MOV is used on the differential mode line; PCB Layout does not take up space, suitable for low power compact circuits.

It is connected in series with a NTC that suppresses inrush current. This is helpful for absorbing inrush current when the power switch (ON / OFF) is switched, reducing the occurrence of electric sparks during the switching process, and making the constant current accuracy higher and more stable. It is also conducive to extending the life cycle of the rectifier voltage regulator circuit devices in the subsequent stage.

Disadvantages

The requirements for the MOV and the flame retardancy of the chassis are relatively high.


Device selection (110V power supply voltage fluctuation 20%):


Driving power (Including constant

current or constant voltage)

Test Level IEC61000-4-5 / GB/T17626.5
Device

Level 

0.5KV

Level 2

1.0KV

Level 3

2KV

Level 4

4KV

100W ≤ P ≤ 300W MOV 14D241K 14D241K 20D241K 25D241K
NTC 2.5D20 or D25 2.5D20 or D25 2.5D20 or D25 2.5D20 or D25
GDT 2R230L-5.5 2R230L-6 2R230L-8 2R230L-10
50W ≤ P ≤ 100W MOV 10D241K 14D241K 20D241K 20D241K
NTC 5D15 or D20 5D15 or D20 5D15 or D20 5D15 or D20
GDT 2R230L-5.5 2R230L-6 2R230L-8 2R230L-10
15W ≤ P ≤ 50W MOV 10D241K 10D241K 20D241K 20D241K
NTC 5D9 or D11 5D9 or D11 5D9 or D11 5D9 or D11
GDT 2R230L-5.5 2R230L-6 2R230L-8 2R230L-10
5W ≤ P ≤ 15W MOV 07D241K 10D241K NC NC
NTC 5D7 or D9 5D7 or D9 NC NC
GDT 2R230L-5.5 2R230L-6 NC NC
Device selection (220V power supply voltage fluctuation 20%):


Driving power  (Including  constant

current or constant voltage)

Test Level IEC61000-4-5 / GB/T17626.5
Device

Level 

0.5KV

Level 2

1.0KV

Level 3

2KV

Level 4

4KV

100W ≤ P ≤ 300W MOV 14D511K 20D511K 20D511K 25D511K
NTC 2.5D15 or D20 2.5D15 or D20 2.5D15 or D20 2.5D15 or D20
GDT 2R600L-6 2R600L-6 2R600L-8 2R600L-10
50W ≤ P ≤ 100W MOV 14D511K 14D511K 20D511K 25D511K
NTC 5D15 or D20 5D15 or D20 5D15 or D20 5D15 or D20
GDT 2R600L-6 2R600L-6 2R600L-8 2R600L-10
15W ≤ P ≤ 50W MOV 10D511K 10D511K 20D511K 25D511K
NTC 10D9 or D11 10D9 or D11 10D9 or D11 10D9 or D11
GDT 2R600L-6 2R600L-6 2R600L-8 2R600L-10
5W ≤ P ≤ 15W MOV 7D511K 7D511K NC NC
NTC 22D7 or D9 22D7 or D9 NC NC
GDT 2R600L-6 2R600L-6 NC NC
Indoor Lighting


Features: The working environment of the indoor lighting system is relatively prone, and it is not easy to be affected by lightning surges; but it is easily affected by the indoor electrical equipment and needs to be fully considered in terms of cost.

Electrical characteristics: The input voltage range is applicable, and the constant current accuracy is required.

Drive power (including constant

current or constant voltage)

Suggested Options

100W ≤ P ≤ 300W

Option 2、Option 3

50W ≤ P ≤ 100W

Option 2、Option 3、Option 4

15W ≤ P ≤ 50W Option 3、Option 4
5W ≤ P ≤ 15W

Option 4

Device selection (110V power supply voltage fluctuation 20%)


Driving power (Including constant
current or constant voltage)
Test Level IEC61000-4-5 / GB/T17626.5
Device Level 1
0.5KV
Level 2
1.0KV
Level 3
2KV
Level 4
4KV
100W ≤ P ≤ 300W MOV 20D241K 25D241K NC NC
NTC 5D20 or D25 5D20 or D25 NC NC
GDT 2R230L-6 2R230L-6 NC NC
50W ≤ P ≤ 100W MOV 14D241K 14D241K NC NC
NTC 5D15 or D20 5D15 or D20 NC NC
GDT 2R230L-6 2R230L-6 NC NC
15W ≤ P ≤ 50W MOV 10D241K 14D241K NC NC
NTC 5D9 or D11 5D9 or D11 NC NC
GDT 2R230L-6 2R230L-6 NC NC
5W ≤ P ≤ 15W MOV 07D241K 10D241K NC NC
NTC 5D7 or D9 5D7 or D9 NC NC
GDT NC NC NC NC
Device selection (220V power supply voltage fluctuation 20%)


Driving power (Including constant
current or constant voltage)
Test Level IEC61000-4-5 / GB/T17626.5
Device Level 1
0.5KV
Level 2
1.0KV
Level 3
2KV
Level 4
4KV
100W ≤ P ≤ 300W MOV 20D511K 20D511K NC NC
NTC 2.5D20 or D25 2.5D20 or D25 NC NC
GDT 2R600L-6 2R600L-6 NC NC
50W ≤ P ≤ 100W MOV 14D511K 14D511K NC NC
NTC 5D15 or D20 5D15 or D20 NC NC
GDT 2R600L-6 2R600L-6 NC NC
15W ≤ P ≤ 50W MOV 10D511K 14D511K NC NC
NTC 10D9 or D11 10D9 or D11 NC NC
GDT 2R600L-6 2R600L-6 NC NC
5W ≤ P ≤ 15W MOV 07D511K 10D511K NC NC
NTC 5D7 or D9 5D7 or D9 NC NC
GDT NC NC NC NC
International Safety and EMC Standards


Safety Category Country Standard
UL USA & Canada

UL8750, UL935, UL1012, UL1310 Class 2

CSA-C22.2 No. 107.1, CSA C22.2 NO.

CE Europe EN 61347-1,EN61347-2-13
EMI Standards Country Notes
EN 55015 Europe

Conducted emission Test & Radiated emissio

Test with 6 dB margin

FCC USA FCC Part 15 Class B, ANSI C63.4: 2009.


EMS Standards Notes
EN 61000-3-2 Harmonic current emissions
EN 61000-3-3 Voltage fluctuations & flicker
EN 61000-4-2 Electrostatic Discharge (ESD): 8 kV air
discharge, 4 kV contact discharge
EN 61000-4-3 Radio-Frequency Electromagnetic Field
Susceptibility Test-RS
EN 61000-4-4 Electrical Fast Transient / Burst-EFT
EN 61000-4-5 Surge Immunity Test: AC Power Line: line to
line 2 kV, line to earth 4 kV
EN 61000-4-6 Conducted Radio Frequency Disturbances
EN 61000-4-8 Power Frequency Magnetic Field Test
EN 61000-4-11 Voltage Dips
EN 61547 Electromagnetic Immunity Requirements
Applies To Lighting Equipment


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