By LEIDITECH | 29 July 2024 | 0 Comments
Surge protection scheme for charging piles—The key to ensuring the safe and stable operation of char
In the era of booming development of new energy vehicles today，Charging stations as electric vehicles“gas station”，Its importance is self-evident。however，Due to its complex electrical environment and outdoor exposure characteristics，Charging stations are easily affected by surges。Surge may come from lightning、Power grid malfunction、Start stop of high-power equipment, etc，Causing serious damage to electronic devices and energy storage systems at charging stations。therefore，Designing an effective surge protection scheme is the key to ensuring the safe and reliable operation of energy storage charging piles。
one 、Sources and hazards of surges
The main sources of charging pile surges are：
1. thunder：The strong electromagnetic field generated by direct lightning strikes or nearby lightning strikes will induce high voltage and high current surges on the lines of the charging station。
2. Power grid malfunction：If there is a short circuit、Switch operation、Voltage fluctuations in the power grid, etc，May cause transient overvoltage。
3. Equipment start stop：High power equipment（Like an electric motor、Transformers, etc）The start and stop of can cause sudden changes in current and voltage in the circuit，Generate surge。
Surge may cause the following hazards：
1. Damaged charging module of charging station、control unit 、Communication equipment, etc，Affects normal charging function。
2. Battery management system in energy storage system（BMS）、Damage caused by battery pack，Reduce battery life and performance。
3. Triggering a fire、Serious safety accidents such as explosions。
Provide the above reasons，If not effectively protected，Will cause serious damage to charging stations and their connected electric vehicles。therefore，It is crucial to develop a scientifically reasonable surge protection plan for charging piles。
two、Design principles for protection schemes
Shanghai Leimao has developed the following design principles based on the above situation：
1. Multi level protection：Adopting a graded protection strategy，From power input to device port，Gradually reduce surge energy and voltage。
2. quick response：The protective device should have a fast response time，Capable of taking action at the moment of surge occurrence。
3. Sufficient flow capacity：Capable of withstanding the maximum possible surge current，Ensure not to be punctured。
4. Low residual pressure：After discharging surge current，The residual voltage at the output terminal should be minimized as much as possible，Protect backend devices。
three、Specific protective measures
first，At the power entrance of the charging station，High performance surge protectors should be installed（SPD）。This type of protector is usually composed of gas discharge tubesGDT、VaristorMOVHigh power transient voltage suppressiondiode（TVS）Equal component compositionGDTCapable of withstanding large surge currents，Quickly conduct when a surge arrives，Release most of the energy to the earth；MOVIt has a faster response speed，Can limit the rise of voltage within microseconds；High powerTVSThe diode, on the other hand, has an extremely fast response speed（Nanosecond level）Accurate voltage clamping capability，Further suppress residual surges，Ensure the safety of the backend circuit。
These three types of devices are the main surge protection devices for charging piles，It is also an advantageous component of Shanghai Leimao，GDT andMOV beforeBlogIntroduced，This time, we will mainly introduce high-power blue babies BPSS。
four、High power TVS Blue Baby
Usually refers to the Blue Baby surge suppressor，This is a high-power device TVS diode（Transient voltage suppression diode）。It has super strong surge absorption and voltage suppression capabilities，In practical applications, it is usually connected in parallel in circuits，Can solve the problem of lightning strikes and large surges，It can also provide strong protection against static electricity。
Its main advantages include：
- Strong surge absorption capability：maximum Ipp Can reach up to 20KA。
- Complete series：For example, there are 1KA、2KA、3KA、6KA、10KA、16KA、20KA Equivalent series。
- Fast response speed（microsecond ），Can protect devices from damage。
- Leakage current Ir small，Reduce fever。
- Has low slope resistance。
- Efficient energy consumption，Helps reduce energy costs。
- There are multiple packaging sizes to choose from。
- Supports extremely low voltage。
- Stable and reliable、Longer lifespan、Smaller volume。
five、Selection of charging stationsTVSBlue Baby Model
If you want to learn more about the specific models of Blue Baby surge suppressors、parameter、Application cases and other information，Or it may require procurement and use，Please contact Shanghai Leiditech EMCLittle brother。
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