Some beginners face GDT not how to use, application fields and some friends also discharge of ceramic gas is still a little strange or are only know that they often use the appliances. Application of electronic technology today tage Xiaobian to tell you something about the use of ceramic ceramic gas discharge tube and gas discharge tube of the two problems. GDT guidance:
In 1, under the impact of rapid pulse, GDT gas ionization requires a certain amount of time (usually 0.2 ~ 0.3 s, the fastest also has about 0.1 s), which has a higher amplitude spike will leak to the back. To curb the sharp pulse, there are several ways: A, in the discharge tube or shunt capacitor varistor; transmission line B, in the discharge tube after the series inductance or stay length is appropriate, the sharp pulse attenuation to the lower level; C, using two levels of protection circuit to discharge tube as the first stage in TVS tube or semiconductor overvoltage protection device as the second level, two level between the resistance and inductance or self recovery fuse isolation.
2, DC breakdown voltage Vsdc selection: DC breakdown voltage Vsdc minimum value should be greater than the maximum possible power supply peak voltage or maximum signal voltage of more than 1.2 times.
3, the impact of discharge current selection: according to the maximum surge current on the line or the maximum surge current needs to be protected. The discharge tube should be according to the nominal discharge current shock impulse discharge current (or half a single impulse discharge current) to calculate 4, GDT due to breakdown voltage error is large, generally do not make use of parallel.
5, the continued flow problem: in order to make the normal arc discharge in shock after the breakdown in the possible freewheeling place (such as active circuit), in the discharge tube series varistor or self recover fuse limit continued flow, make it less than the holding current discharge tube.
More than five point about the ceramic gas discharge tube using the rules, then the following is the ceramic gas discharge tube used to explain the field!
The application of ceramic gas discharge tube:
GDT is the most widely used switching device of lightning protection equipment, surge current, up to 20KA, 40KA, 50KA, 60KA, 100KA, 150KA or reach higher, interelectrodecapacitance low minimum 1pF; insulation resistance up to 10G, the breakdown voltage of large dispersion. It can play the role of lightning protection in communication products, lightning protection devices, special power supply, communication lines, communication distribution frame, security unit, security products and other products.
About other related technical problems in ceramic gas discharge tube can contact online electronic official website online tage of technical personnel, we will provide the latest technical resources to explain the existing questions in your heart!