GDT is how to work flow?
Use a large number of ceramic gas discharge tube in the lightning surge protection circuit, transient surge and over voltage protection scheme, ceramic gas discharge tube comprises tage electronic discharge tube, plug-in ceramic gas discharge tube, gas discharge tube diode and transistor chip ceramic ceramic gas discharge tube gas, voltage range from 75V to 3500V. More than one hundred kinds of specifications; ceramic gas discharge tube with ceramic encapsulated inside by two or more band gap metal electrodes, filled with inert gas argon, neon, two electric voltage when added to the extreme to the ceramic gas discharge tube gas breakdown when the gas discharge tube to discharge from high impedance a low impedance, the surge voltage rapidly to zero voltage and short circuit, over current release into the ground, thus protecting the subsequent circuit.
This small detail for you on the working principle of ceramic gas discharge tube. At the front, small has introduced, ceramic gas discharge tube is composed of two electrodes separated by a certain distance from the package in the ceramic tube is filled with inert gas composition. Its electrical properties basically depend on the type of gas, gas pressure and electrode distance, the middle of the gas filled mainly neon or argon, and maintain a certain pressure, the electrode surface coated with propellant to reduce the electron emission energy. These measures allow the action voltage to be adjusted (typically 70 V to a few thousand volts) and can be maintained within a certain error range. When the voltage is lower than the discharge voltage, the gas discharge tube is an insulator (Rohm>100M resistor). When the voltage rises above the discharge voltage, generating arc discharge, gas ionization discharge from high impedance to low impedance, so that the voltage decreases rapidly, falling about tens of volts. The gas discharge tube by transient high energy impact, it can take 10-6 seconds of the speed, the high impedance between two poles into the low impedance, high inrush current through the several. Please continue to pay attention to more knowledge from the working principle of electronic, ceramic gas discharge tube, gas discharge tube is how to work, welcome consultation from the electronic.

1, how to effectively prevent the transient overvoltage?
In daily life, work, the electronic circuit transient over-voltage is often occurring. The cause of abnormal voltages are between the lightning surge voltage, power lines and communication lines, due to accidental contact misoperation caused accidents and increase the voltage of power supply device in the switch action in the process of the. If not handled in time, the instantaneous over-voltage will not only cause the semiconductor, integrated circuits and equipment within the precise components of the damage, but also pose a threat to personal safety.
Therefore, if the electrical equipment to have high reliability and long life, it must be effective protection against over-voltage. Is effective to prevent the transient overvoltage suggest gas discharge tube.
The utility model relates to a discharge tube which is a switch type device which is led by voltage. When the external voltage surge has not reached its operating voltage, the discharge tube is in a high impedance (insulation resistance of 1000M ohms above), and once the surge voltage reaches its operating voltage, discharge discharge gap breakdown occurs immediately, the discharge tube is equivalent to a good conductor, the surge voltage is rapidly shorted to near zero the voltage at 50ns time, surge current was quickly into the ground, thus to protect the equipment. When the surge voltage disappears, the GDT will extinguish and return to a high impedance state, waiting for the next action.

2, the internal structure of ceramic gas discharge tube
Ceramic gas discharge tube GDT is in the discharge gap is filled into the gas medium proper, with the high activity of electron emission material and discharge induced by design, a special porcelain made by vacuum brazing gas discharge device, which is mainly used for high voltage transient overvoltage protection.
Ceramic discharge tube in parallel lines, under normal circumstances, the discharge tube for high impedance and low capacitance characteristics of its own, the normal work of the line have almost no effect. When the abnormal surge into the discharge tube, with nanosecond response speed, the first is the breakdown discharge, the impedance decreased rapidly, almost a short circuit state, the discharge tube will surge current discharge to the earth through the ground, so as to protect the circuit and components. When the abnormal surge disappears, the discharge tube is quickly restored to the state of high resistance, and the circuit continues to work normally.

3, guiding the use of ceramic gas discharge tube
Always flow breakdown voltage VS choice: DC breakdown voltage VSdc minimum value should be greater than the highest possible peak voltage or maximum signal voltage 1.2 times.
Two in the 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.
Selection of impulse discharge current: according to the maximum surge current on the line or the maximum surge current to be protected. The discharge current of the discharge tube should be calculated according to the nominal impulse discharge current (or half of the single impulse discharge current).
Four continuous 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.
Wu GDT due to breakdown voltage error is large, generally do not make use of parallel.