Surge test and protection scheme of power adapter
Test products: surge test of power adapter;
Temperature and humidity of Leimao laboratory: 26 degrees, 61%;
Test standard: it is required to pass IEC61000-4-5 to test DC 60V；;
Test purpose: to test whether Leimao TVS 5.0SMDJ60CA has passed IEC61000-4-5 standard.
1. The requirements for testing products and standards are as follows:
|
testing nominative |
|
DC |
surge |
input voltage |
frequency |
|
IEC61000-4-5 |
Differential mode |
60V |
8/20 |
1KV |
5C |
|
common mode |
60V |
8/20 |
2KV |
5C |
Second, Lei Mao adopts circuit protection scheme:
Third, the test was changed to Lei Mao 5.0SMDJ60CA photo and result data record:
|
8/20 |
Power Supply |
voltage |
Coupling mode |
Test times |
test result |
|
original negative |
48V |
+0.5KV |
L-N |
1C |
bad |
|
Add varistor |
48V |
±0.5KV |
L-N |
1C |
bad |
|
Add TVS 5.0SMDJ60CA 2 capsules. |
48V |
±0.5KV |
L-N |
5C |
good |
|
48V |
±1KV |
L-N |
5C |
good |
|
|
48V |
±1KV |
L-PE/N-PE |
5C |
good |
|
|
48V |
±2KV |
L-PE/N-PE |
5C |
good |
|
|
Add |
48V |
±0.5KV |
L-N |
5C |
good |
|
48V |
±1KV |
L-N |
5C |
good |
|
|
48V |
±1KV |
L-PE/N-PE |
5C |
good |
|
|
48V |
±2KV |
L-PE/N-PE |
5C |
good |
It is recommended to use 5.0SMDJ60CA to meet the requirements of surge IEC61000-4-5 test.
summary
The interface protection of electronic products needs over-voltage protection devices, and many engineers realize that protection devices are needed. However, due to improper selection or failure to follow the design principles of protection circuit PCB, the electrostatic test or EMC test of the products failed, and the products were repeatedly verified and tested, wasting manpower and financial resources, which always caused the products to be delayed in the market or over-designed, resulting in cost pressure. Leimao Electronics provides EMC design services for customers, provides laboratories to do bottom-up tests, and completes the design with high efficiency and convenient cost control, hoping to do our best for more customers to quickly pass EMC projects and improve product reliability. Leimao Electronic emc lab provides free testing and reference circuits for peripheral electrostatic protection.
Leimao test equipment is available for customers to test for free. Please feel free to contact Hu Gong at 18016225001.