In the circuit of the protection that prevent thunder of power source system, gas discharge tube of pottery and porcelain and pressure quick the program that resistor coordinates to apply is very common, already was applied extensively in the domain such as communication system, railroad especially. In circuit protection program, pressure quick resistor cooperates GDT application, although have a lot of advantages, be like: Control is pressed quick the deterioration of resistor, reduce residual voltage to wait, but, in using a process actually, if circuit designs the word that plan misgivings is become or circuit protects error of yuan of type selecting of parts of an apparatus, can cause the trouble such as protective circuit occurrence combustion, explosion, of then influence system move normally. Next, will introduce in the light of GDT and pressure quick resistor cooperates to apply in, the problem that can appear expresses view, the hope can be helped have demand you!

 

 

One, gas discharge tube of pottery and porcelain and pressure quick the problem that resistor establishs ties

 

In protection of the circuit that prevent thunder, besides should take circuit seriously to protect the effect besides, the another key that pays close attention to even is, prevent the to circuit effect when Lei Bao protects invalidation of parts of an apparatus. Gas discharge tube of pottery and porcelain and which kinds of type pressing quick of resistor cooperate to apply, with the reliable security be closely bound up that protects circuit. Current, in protection of the circuit that prevent thunder, use pressure quick resistor type has: Pressure quick fuse of resistor series connection, pressure quick resistor sticks outfit temperature fuse, belt machinery takes off those who buckle mode to press quick resistor, situation of specific moving work is as follows:

 

1) GDT and pressure quick fuse of resistor series connection or stick outfit temperature fuse: Moving in, pressure quick after invalidation of short circuit of resistor happening puncture, the short-circuit current in if circuit cannot fusing fuse, the gas discharge tube of pottery and porcelain that establishs ties right now will turn from glow discharge for arc discharge, the plastic case that high fever can bring about PCB board or assembles produces combustion or GDT blast is cracked.

 

2) GDT and take machinery to take off those who buckle mode to press quick resistor: Take machinery to take off those who buckle mode to press quick resistor has very good invalidation to protect a function, show with respect to cipher out unusual when, also can make protect circuit and power source safety to be broken away from.

 

 

2, gas discharge tube of pottery and porcelain and pressure quick the problem of resistor paralell connection

 

On certain protection circuit, can use pottery and porcelain gas discharge tube and pressure quick the pattern that resistor paralell connection uses, below this kind of circumstance, the problem of basically nonexistent follow on current. Pressure quick resistor and GDT paralell connection, basically be to use pressure quick the wave head that resistance will come to answer overvoltage, rely on next pressure quick the residual voltage of resistor guides ignition of gas discharge tube of pottery and porcelain the impulse current of the enlarge that open leak.

 

In program of protection of this kind of circuit, pressure quick of resistor pressure quick the key that voltage choice is decision protection effect. If press quick of resistor pressure quick voltage is too low, will appear pressure quick resistor is damaged, and the phenomenon that gas discharge tube of pottery and porcelain does not work, have the effect that is less than protective circuit at all.

 

 

3, gas discharge tube of pottery and porcelain and pressure quick the problem that resistor combination is an organic whole

 

Nowadays, gas discharge tube of pottery and porcelain and pressure quick the module preventing thunder of unifinication of resistance group synthesis, miniaturization, apply extensively at railway system and communication industry. In pottery and porcelain gas discharge tube and pressure quick in the protective circuit that resistor combination is unifinication, how undertaking circuit joins is the key that safeguard unifinication prevents sex of thunder module on the safe side.

 

The engineer expressed a view:

1) do not suggest gas discharge tube of pottery and porcelain and pressure quick resistor undertakes the face solders sticking, because this both hot coefficient of expansion is different, if solder GDT directly,be in pressure quick of resistor base piece on silver-colored face, when sufferring strong electric current to pound, can direct damage.

2) after preventing thunder module be no longer in force to assure can safety severs power source system, right now, invalidation protects take off the position that deduct a point is mixed it is very important to buckle mode.