用于ESD分析的传输线脉冲测试 (Transmission Line Pulse - TLP Measurement) 元件级
151230 selv, non-selv led driver and class i- ii-iii luminaire
1. Luminaire Protection Class (Class I, II & III)
and LED Driver Types (SELV & non-isolated)
Tridonic China | Deputy of PM | Cole Siu | Dec 2015
2. Luminaire Protection Class
According to IEC 60598-1, Luminaires shall be classified according to the type of protection
against electric shock, as class I, class II or class III.
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Source: IEC 60598 – 1 (8th Edition, 2014-05)
3. Insulation Model of a LED Luminaire
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SELV Driver
DC voltage < 60/120V*
AC voltage < 25/55VRMS*
Protective separation (i.e., double
insulation, reinforced insulation or
protective screening Source: IEC 60598 – 1 (8th Edition, 2014-05)
4. About SELV
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Question: What’s SELV?
Safety Extra Low Voltage
<120 Vdc / 55 Vac
SELV is a must for Class III luminaires, and
optional for Class I/II luminaires’ application
SELV
SELV Safety Extra Low Voltage
55 Vac or 120 Vdc (ripple-free)
Touchable SELV
Allow to touch both poles
Active SELV
Allow to touch single pole only
< 60 Vdc ripple-free
Max. touch current: 2 mA
(Human resistance 50k Ohm)
< 120 Vdc ripple-free
5. Creepage & Clearance requirement of Basic
Insulation, and Double or reinforced insulation
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Note: Creepage and clearance
distance here serve only as
explanation purpose. They do
not conform to latest IEC
requirements.
9. Electric Strength Test
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Source: IEC 60598 – 1 (8th Edition, 2014-05)
Cautions: The electric strength test method could
undermine the reliability of the LED. It is recommend to
applying the insulation resistance measurement method
for quality test purpose during serial production.
12. Non-isolated driver + LLE:
Good match for class I luminaires
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Reason:
• With class I luminaires, even it is using non-isolated driver only basic insulation is required.
13. Non-isolated driver + LLE:
Good match for class I luminaires
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Reason:
• All LLE modules can suffice the insulation resistance requirement for class I luminaires (including the Best Deal).
Cautious:
• Ehen mounting the LLE modules directly with metal screws
with a big screw cap it could damage the PCB surface or
reduce the creepage & clearance distance (see picture). In
this case, it is advised to use a plastic flat washer.
• MCPCB is vey difficult to endure >1000V surge/burst voltage:
- Suggest to use FR4 or CEM3 PCB materials.
14. Non-isolated driver + LLE:
Good match for class I luminaires
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Reasons:
• Large metal casing where it is easy to provide the protective earth connection
• Large cavity to provide sufficient creepage and clearance distance
• Advantage of non-isolated driver compared to SELV / isolated driver:
Higher efficiency
Lower cost
Cautions:
• The construction of the luminaire prevent it from being opened without special tools
• The construction of the luminaire prevent the LED light module from being touched by an end-user
15. Non-isolated driver + LLE:
Key Points of Safety Issues
The possible path of current flow:
• Primary Input – Secondary Output – LED Module – Fixing Accessories – Fixture Housing
• Key Points:
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Non-isolated Driver
Fixing Accessories
Secondary Output
Primary Input
LED Board
Housing / Earthing
L
N
(1) LED PCB (2) Housing and installation (3) Fixing accessories
16. Non-isolated driver + LLE:
Key Points of Safety Issues
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LED PCB:
Ensure the necessary insulation of PCB materials.
Ensure the necessary Clearance & Creepage
Distance from PCB layout considering.
Suggest to replace MCPCB with FR4 / CEM3 PCB
materials:
Good enough thermal behavior.
Better voltage stress/insulation performance.
Lower PCB material cost.
Fixing accessories:
Metal screws may damage the PCB surface and
insulation.
Metal screws may reduce the Creepage &
Clearance Distance.
It is advised to use plastic components, including flat
washer, clip, bridge, etc. This would improve the
safety and assembly efficiency.
Housing and installation:
The protective earthing is a must for Class I fixture.
Prevent the LED module from being touched directly.
Prevent the fixture housing being opened without
special tools.
17. SELV driver make designing easier for class II
luminaires, compared to non-isolated driver
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18. Types of luminaires where SELV driver present
big benefits
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Typical use cases
• Extremely slim and compact luminaires(e.g. slim battens) with metal housing - limited space inside the
luminaire for creepage & clearance distance, or impossible to provide protective earth terminal.
• For lighting installation in a high risk environment of electric shock where there are frequent human
contacts or exposured to water. (e.g. ceiling or wall lights in shower room, freezer lights, shelf lights, etc.)
• Luminaire compartment (usually class III) which can be replaced on-site.
27. 电气强度测试
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信息来源: IEC 60598 – 1 (8th Edition, 2014-05)
部件的绝缘
试验电压/V
Ⅰ类灯具 Ⅱ类灯具 Ⅲ类灯具
安全特低电压(SELV):
不同极性的载流部件之间 a a a
载流部件和安装表面* 之间 a a a
载流部件和灯具的金属部件之间 a a a
被固线装置夹紧的软线或电缆的
外表面和可接触的金属部件之间
a a a
第5章中描述的绝缘套管 a a a
非安全特低电压(非SELV):
不同极性的带电部件之间 b b -
带电部件和安装表面* 之间 b b 和c, 或d -
带电部件和灯具的金属部件之间 b b 和c, 或d -
通过开关的动作可以成为不同极
性的带电部件之间
b *** b *** -
被固线装置夹紧的软线或电缆的
外表面和可接触的金属部件之间
b c -
第5章中描述的绝缘套管 b c -
(a) 对SELV电压的基本绝缘 500
(b) 对非SELV电压的基本绝缘 2U ** + 1 000
(c) 附加绝缘 2U ** + 1 000 (+1 750 in GB7000.1-2007)
(d) 双重绝缘或加强绝缘 4U ** + 2 000 (+2 750 in GB7000.1-2007)
* 进行本试验时,安装表面用金属箔覆盖。
** U 在这里定义为零线接地的供电系统中的带电极-中性极之间的相电压。建议参照IEC 60664-1。
*** 在测试中,开关可能影响结果。按照IEC 61058-1:2000, 7.1.11,为了避免电子关断或微关断的
情况,有必要去除电路中的开关。
表 10.2 – 电气强度
注意: 电气强度的测试方法会降低LED的可靠性。建
议采取绝缘电阻的测试方法用于批量生产时的质量检
验用途。
28. 绝缘电阻测试
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信息来源: IEC 60598 – 1 (8th Edition, 2014-05)
部件的绝缘
最小绝缘电阻M
Ⅰ类灯具 Ⅱ类灯具 Ⅲ类灯具
安全特低电压(SELV):
不同极性的载流部件之间 a a a
载流部件和安装表面* 之间 a a a
载流部件和灯具的金属部件之间 a a a
被固线装置夹紧的软线或电缆的外表面
和可接触的金属部件之间
a a a
第5章中描述的绝缘套管 a a a
非安全特低电压(非SELV):
不同极性的带电部件之间 b b -
带电部件和安装表面* 之间 b b 和c, 或d -
带电部件和灯具的金属部件之间 b b 和c, 或d -
通过开关的动作可以成为不同极性的带
电部件之间
b ** b ** -
被固线装置夹紧的软线或电缆的外表面
和可接触的金属部件之间
b c -
第5章中描述的绝缘套管 b c -
(a) 对SELV电压的基本绝缘 1
(b) 对非SELV电压的基本绝缘 2
(c) 附加绝缘 2
(d) 双重绝缘或加强绝缘 4
* 进行本试验时,安装表面用金属箔覆盖。
** 在测试中,开关可能影响结果。按照IEC 61058-1:2000, 7.1.11,为了避免电子关断或微关断的
情况,有必要去除电路中的开关。
表 10.1 – 最小绝缘电阻 10.2.1 试验方法– 绝缘电阻
绝缘电阻应在施加约500 V直流电压1 min后测定。
对于灯具的安全特低电压部件的绝缘,用于测量的直流电压为100 V。
绝缘电阻不应低于表10.1 规定的数值。
Ⅱ类灯具,如果基本绝缘和附加绝缘能单独试验的话,则不应对灯具的带电
部件和壳体之间的绝缘进行试验。