Background:
In the last 2 days of 2015, the new safety regulations on national security charge system for charging pile, charging pile often placed on the outside, from the power supply, accidentally encountered lightning and surge voltage abnormality. If the internal control circuit is not isolated, the internal circuit will be burned out, resulting in charging pile short-circuit or human electrocution, death and other dangerous events. In the new national standard on the charging pile under surge (impact) immunity clearly stipulates: the charger should be able to withstand the test class "17626.5-2008" provisions of GB/T chapter fifth to 3 level surge (impact) immunity test.
Under the interpretation of the specific content as follows.
Protection requirement:
In the standard description of two kinds of waveform generator, a (voltage: 1.2/50us, current: 8/20us) combination wave generator, the other one is in line with the requirements of the international telecommunication union committee (voltage: 10/700us, current waveform:
5/320us) combined wave generator.
The standard specifies that the surge test should be tested by at least 2KV of surge.
According to 8/20 waveform generator internal resistance characteristic 2 ou, corresponding current is 1KA energy.
Product protection parts
By charging pile internal structure can be found, the charge control management unit pile mainly include: the main control unit, voltage control unit, a current control unit, display and print control unit, a battery control unit, control unit. Therefore, the safety specification of charging pile is the ability to protect the internal card reader, touch screen, meter and charging control unit against lightning surge. Therefore, surge protection is required at the interface of the charging control unit, the card reader and the meter:
1 、 control module communication port RS485 interface protection
From the electronic scheme are as follows
GDT:3R090-5S
FUSE: SMD1210P050TF
TVS: SM712
Satisfaction standard:
IEC61000-4-2, GB/T 17626.2
IEC61000-4-5, GB/T17626.5

2 、 control module communication port RS232 interface protection
From the electronic scheme are as follows
GDT:3R090-5S
FUSE: SMD1210P050TF
TVS: SMC12
Satisfaction standard:
IEC61000-4-2, GB/T 17626.2
IEC61000-4-5, GB/T17626.5

3 control module, communication port, Can interface protection
From the electronic scheme are as follows
GDT:3R090-5S
FUSE: SMD1210P050TF
TVS: SMC12
Satisfaction standard:
IEC61000-4-2, GB/T 17626.2
IEC61000-4-5, GB/T17626.5

4 control module, communication port, USB interface protection
From the electronic scheme are as follows
TVS: SR05
Satisfaction standard:
IEC61000-4-2, GB/T 17626.2
IEC61000-4-2, CONTACT, DISCHARGE:, 8KV, AIR, DISCHARGE:, 15KV

5 communication port network 100M interface protection
Integrated component program

Discrete component scheme

GDT:3R090-5S
FUSE: SMD1210P050TF
TVS: SLVU2.8-4 LC03CI
Satisfaction standard:
IEC61000-4-2, GB/T 17626.2
IEC61000-4-5, GB/T17626.5