Anti electrostatic protection scheme for sharing bicycle electronic lock



Sharing, sharing economy, Internet plus, these hot words not just words.
In the basic public construction, such as: highways, railways, bridges, tunnels, the park has been built intact. Our society has begun building a mobile sharing economy, such as: sharing bicycles, sharing electric bikes, sharing electric cars, and sharing the Cara OK hall......
Especially the number of bike sharing, more and more large scale, like spring rain, water on both sides of the Changjiang River. Our country recently introduced the sharing of bike development guidelines, clearly sharing bicycles must be equipped with positioning systems and electronic locks. Mobai bicycle standard is positioning system and electronic lock, it is the industry leader, what want to in front of. Sharing has to worry about, reducing the cost of repairs.
The shared bike electronic lock is based on the 2G/3G module transmission technology. The circuit of the electronic lock is very important for anti-static protection. Mobell bicycle a small circuit board used more than 7 TVS/ESD:
Sharing bike electronic locks requires a lot of protection, as follows:
1.SIM card, you can choose anti-static ESD:SRV05-4, or ESDA05CT, or SD05C, or SDA05CW or ESDA05CP, common capacitor, one-way protection of the internal structure of ESD, as shown.

2.GPS antenna, you can choose anti-static ESD:ULC0511CDN, or LC05CI
The ultra low capacitance single channel ESD internal structure has a much reduced capacity diode:

3.24V power, you can choose anti-static ESD:SDA2411CBP or SD24C
4. regular I/O import and export, you can choose anti-static ESD:ESDA05CT or SD05C, or SDA05CW or ESDA05CP
5.USB2.0, you can choose anti-static ESD:SRV05-4 or SDA05CW or ESDA05CP
The protection scheme is shown below:

SIM card protection case


I/O interface protection case

For the protection of IO can adopt 2 kinds of scheme of integrated and discrete, more customers choose SOD-323 package SD05C to protect SD05C, because the power is more than 300W, can effectively resist some lightning surge interference outside.

RF GPS antenna interface protection case

Module based antennas use high frequency signals, so here an ultra-low capacitor ESD ULC0511CDN can be designed to protect them

24V DC power interface protection

According to the power supply protection many design using PESD24VL1BA, from electronic SD24C anti surge capacity will be stronger, at about 400W.
Welcome to R & D Engineer for samples.