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| 型號： | AN-15 |
| 英文描述： | TOPSwitch Power Supply Design Techniques for EMI & Safety |
| 中文描述： | 的TOPSwitch電源電磁干擾設(shè)計技術(shù) |
| 文件頁數(shù)： | 6/36頁 |
| 文件大?。?/td> | 381K |
| 代理商： | AN-15 |
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AN-15
A
6/96
6
IEC950 Requirements (Applicable to
TOPSwitch Power
Supplies
)
(1.4.5): In determining the most unfavorable supply voltage for
a test, the following variables shall be taken into account:
multiple rated voltages
extremes of rated voltage ranges
tolerance on rated voltage as specified by the manufacturer.
If a tolerance is not specified, it shall be taken as +6% and
- 10%.
(1.6.5): Equipment intended to operate directly from the mains
supply shall be designed for a minimum supply tolerance of
+6%, -10%.
(2.1.10): Equipment shall be so designed that at an external
point of disconnection of the mains supply, there is no risk of
electric shock from stored charge on capacitors connected to the
mains circuit. Equipment shall be considered to comply if any
capacitor having a rated capacitance exceeding 0.1 uF and
connected to the external mains circuit, has a means of discharge
resulting in a time constant not exceeding 1 second for pluggable
equipment type A (non-industrial plugs and socket-outlets).
This requirement specifically applies to any EMI filter capacitor
connected directly across the AC mains which could cause a
shock hazard on the exposed prongs of an unplugged power
cord.
(5.2.2): Earth Leakage Current: Maximum earth leakage
current must not exceed the limits shown in the following table
under the most unfavorable (highest) input voltage. For class II
equipment when output is not connected to earth ground, the
test shall be made on accessible conductive parts, and to metal
foil with an area not exceeding 10 cm x 20 cm on accessible non-
conductive parts.
Grade of insulation U < 130 VAC 130 < U < 250VAC
Basic, Supplementary 1000 VAC
Reinforced (Primary 2000 VAC
to Secondary)
1500 VAC
3000 VAC
Table 2. Insulation Electric Strength.
(5.3.2): Electric Strength: The insulation shall be subjected for
1 minute either to a voltage of substantially sine-wave form
having a frequency of 50 Hz or 60 Hz or to a DC voltage equal
to the peak of the prescribed AC test voltage. Test voltage shall
be as specified in the following table for the appropriate grade
of insulation and the working voltage U across the insulation:
(5.4.1): Abnormal Operating and Fault Conditions: Equipment
shall be so designed that the risk of fire or electric shock due to
mechanical or electrical overload or failure, or due to abnormal
operation or careless use, is limited as far as practicable.
(5.4.6): For components and circuits (other than motors,
transformers, PC board creepage and clearance distances, or
secondary circuit electromechanical components) compliance
with the abnormal operating and fault condition requirement
(5.4.1) is checked by simulating the following conditions:
- faults in any components in primary circuits (which includes
EMI filter components, bridge rectifier, energy storage
capacitor,
TOPSwitch
, and all
TOPSwitch
connected
components);
- faults in any components where failure could adversely
affect supplementary or reinforced insulation (specifically
failure of Y2-capacitors connected between primary circuits
and secondary circuits);
- additionally, for equipment that does not comply with the
requirement of Sub-clauses 4.4.2 (Minimizing the risk of
ignition) and 4.4.3 (Flammability of materials and
components), faults in all components;
- faults arising from connection of the most unfavorable load
impedance to terminals and connectors that deliver power
or signal outputs from the equipment, other than mains
power outlets (for example: connecting a class II equipment
output terminal to earth ground will increase measured
leakage current).
The equipment, circuit diagrams and component specifications
shall be examined to determine those fault conditions that might
reasonably be expected to occur.
(In general, components designed for use between primary and
secondary circuits, rated for the full electric strength voltage,
and carrying the appropriate safety agency approvals are not
subject to the single component fault test because a short circuit
fault is extremely unlikely. Two component examples are
safety rated optocouplers and Y1-capacitors which can be
applied directly between primary and secondary circuits
operating from AC mains with rated voltages up to 250 VAC.)
Table 1. Maximum Leakage Current.
0.25 mA
0.75 mA
3.50 mA
Class Type of Equipment Maximum Leakage Current
II
I
I
All
Hand-held
Movable
(other than hand-held)
相關(guān)PDF資料 |
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|---|---|
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| AN-18 | TOPSwitch Flyback Transformer Construction Guide |
| AN-19 | TOPSwitch Flyback Power Supply Efficiency |
| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
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