Surge protection for security systems With the development of society and technological progress, all walks of life are a large number of the introduction and use of advanced automation equipment, office networks and industrial television monitoring systems, these devices are often rich in a large number of high-precision electronic, component integration to improve the level of voltage resistance of the equipment continues to decline, the man-made operation of over-voltage, static electricity is very sensitive, and very susceptible to impulse breakdown. According to incomplete statistics from relevant organizations, more than 60% of the damage to electronic and electrical equipment, are caused by surge. So for electronic equipment, the strength of the surge protection performance is very important
Introduction of Security System The security system is an electronic system or network composed of related products to maintain public safety. It mainly consists of five systems: one is the video surveillance system, the second is the burglar alarm system, the third is the access control intercom system, the fourth is the patrol system, and the fifth is the fire broadcasting system. The five subsystems and a large number of electronic and electrical equipment are in a surge-prone environment.
Surge protection strategy for security systems Lightning protection is like flood control, we can dredge the river, and build dams to protect, it from the surge, the same can be done through the channeling and isolation of two ways to protect. (1) channeling - all the surge current through a good grounding system to the earth, can not be directly grounded through the lightning protection components and then grounded, the different grounding systems are connected with equipotential connectors. (2) isolation - the use of grounded metal mesh, metal pipe, etc. to the need to protect the target object (such as microcomputer room, power lines, signal lines, etc.) shielded, the equipment can not withstand the impact of high surge voltages with voltage-limiting components to isolate.
Surge Protection Cases for Security Electronics
Digital hard disk recorders (DVR)
DVR and surveillance cameras are very far away, there is no lightning protection circuit, and it is easy to burn the DVR chip. For the construction of electronic interface lightning protection, strictly speaking, is the use of the introduction of the previous channeling and isolation. TSS protection tube is channeling, channeling the surge to the earth. Its main role is to deploy the high-voltage to withstand the level of the equipment and components to isolate them. For the DVR, in addition to leading the video input interface, the power input system is also vulnerable to lightning, we can use varistors to form a protective circuit. For this circuit, generally speaking, to meet the IEC6100-4-2, that is, 6KV lighting requirements.
2. Surveillance camera Surveillance camera POE power supply technology surge protection.
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HD-SDI interface surge protection circuit: meets IEC61000-4-2, level 4 test requirements; also meets IEC61000-4-5, 10/700uS, 6KV test requirements. Protection devices used: GDT (SG5042B070), ESD (SE3D15B5.0MA) protection devices
1) GDT Ceramic Gas Discharge Tube: SG5042B075 The SG5042 gas discharge tubes (GDTs) are designed to provide a high level of protection against fast-rising transient voltages caused by lightning disturbances. They are available in a square surface-mount package (5.0×5.0×4.2mm) and have a surge performance of 5kA and a capacitance value of ≤1.0pF at break.
2)ESD Suppressor: SE3D15B5.0MA SE3D15B5.0MA series ESD suppressors are widely used for ESD protection">ESD protection of signal interfaces in security monitoring, network communication, automotive electronics, white goods, industrial control, etc. They have the features of low leakage current, fast response time (nS level), small inter-pole capacitance, and high reliability.
Typical Characteristics
Standard surface mount SOD-323 package. Fast response time Excellent clamping capability Low leakage current Halogen free and RoHS and Reach compliant. Product Line Link: https://semiware.com/en/tvs-array/se3d15b5-0ma/
3. Access control
The access controller is the core of the whole access control system, responsible for all information data input, processing, storage, and output. The access controller uses standard industrial serial communication (RS485), a communication distance of up to 1200 meters, using a two-level lightning protection design.
4. Access control reader Access control system surge protection is mainly through the power input port and communication serial port. Access control reader power input is mainly a cut-off. Can be carried out through the upper right figure, and connected in parallel with a varistor or transient suppression diode. As for the access control reader serial port, it is recommended to use the following structure to complete the construction of the protection circuit. Mainly play a role in power limitation, connected in parallel to the line inside, mainly play a role in overvoltage protection, for the access control system, the switching power supply is a source of power, and the strength of the surge of the switching power supply directly affects the security and stability of the access control system.
5. Switching power supply Switching power supply is the power source of the security system. Switching power supply surge immunity performance directly affects the stability and security of the entire system. The strength of the surge performance is determined by the lightning protection circuit it builds, as shown below.
1) GDT Ceramic Gas Discharge Tube: SG2R05B600 The SG2R05B600 series gas discharge tubes (GDTs) are designed to provide a high level of protection against fast-rising transient voltages caused by lightning disturbances. The SG2R05B600 series gas discharge tubes (GDTs) are designed to provide a high level of protection against fast-rising transient voltages caused by lightning disturbances. They are available in a perforated mounting package (5.5 x 6.0mm) with a surge performance of 5KA and a capacitance value of ≤1.5pF at break. Link to product line: https://semiware.com/power-gas-discharge/sg2r05b600/
2) GDT Ceramic Gas Discharge Tube: SG2R08B600 The SG2R08B600 series gas discharge tubes (GDTs) are designed to provide a high level of protection against fast-rising transient voltages caused by lightning disturbances. The SG2R08B600 series gas discharge tubes (GDTs) are designed to provide a high level of protection against fast-rising transient voltages caused by lightning disturbances. They are available in a perforated mounting package (8.0 x 6.0mm) with a surge performance of 5KA and a capacitance value of ≤1.5pF at break. Link to product line: https://semiware.com/power-gas-discharge/sg2r08b600/
6、Gateway Because the gateway is set in the building, so for its surge indicators as long as the ITU-K.21, 10/700μs, 6KV can meet the needs. For this test, can be connected in parallel with a gas discharge tube to complete the discharge tube is mainly selected to reach 2KA, 140V to 200V products (SG4532B150). Fine protection of the rear stage using transient voltage suppressor array SE3D15B5.0MA.
Recommended protection devices: 1) GDT Ceramic Gas Discharge Tube: SG4532B150 The SG4532 series gas discharge tubes (GDTs) are designed to provide a high level of protection against rapidly rising transient voltages caused by lightning disturbances. They are available in a square surface-mounted package (4.5 x 3.2 x 2.7mm) and have a surge performance of 2kA and a capacitance value of ≤0.5pF at break. Link to product line: http://semiware.com/products/Signal-Gas-Tubes/SG4532B150.html
2) TSS Semiconductor Discharge Tube: STB80B320 The STB80B320 series of semiconductor discharge tubes are characterized by low inter-pole capacitance, low leakage current, high surge absorption capability, high stability, and other product features. This axial leaded device is very suitable for Client Premises Equipment (CPE) such as telephones, answering machines, modems, fax machine interfaces, etc. It can also be used as an overvoltage protection device for T1/E1/J1 relay cards, etc., which have certain overcurrent protection requirements.
Standardized surface mount DO-214AA package 80A peak surge capability at 10/1000μs waveform. Peak surge capability of 6KV at 10/700μs waveform. Fast response time up to uS class Low leakage current Low inter-pole capacitance Halogen free and RoHS and Reach compliant. Product Line Link: https://semiware.com/high-reliability-thy/stb80b320/
3) ESD Suppressor: SE3D15B5.0MA SE3D15B5.0MA series ESD suppressors are widely used for ESD protection">ESD protection of signal interfaces in security monitoring, network communication, automotive electronics, white goods, industrial control, etc. They have the features of low leakage current, fast response time (nS level), low inter-pole capacitance, and high reliability.
Typical Characteristics:
Standard surface mount SOD-323 package. Fast response time Excellent clamping capability Low leakage current Halogen free and RoHS and Reach compliant. Product Line Link: https://semiware.com/tvs-array/se3d15b5-0ma/
About Semiware Semiware has a comprehensive product lineup of circuit protection device products. The company leverages its technology in the semiconductor field and application background in end products to serve customers in the electronics, automotive and industrial markets. For more information, please visit semiware official website: https://semiware.com/en/
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