Anti-static and lightning-prevention dual protection circuit
A double protection and anti-static technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve problems affecting EMC performance of electronic equipment, damage to electronic equipment, etc. To achieve the effect of flexible use, avoiding injury or damage, and simple structure
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Embodiment 1
[0014] see figure 1 , an anti-static and lightning protection double protection circuit, including a differential signal interface 1 at both ends and a first differential signal line 2 and a second differential signal line 3 connected to the differential signal interface 1, the first differential signal line 2 and the second differential signal line At least one gas discharge tube 4 connected in series with the differential signal interface 1 is arranged between the signal lines 3, and the gas discharge tube 4 is one. The gas discharge tube 4 has three pins, one of which is used for grounding, and the second pin is used for grounding. The first differential signal line 2 and the second differential signal line 3 are both provided with a resistor 5 , and a transient voltage suppressor 6 connected in parallel with the differential signal interface 1 is provided between the first differential signal line 2 and the second differential signal line 3 .
[0015] First of all, let the...
Embodiment 2
[0017] see figure 2 , an anti-static lightning protection double protection circuit, including a differential signal interface at both ends and a first differential signal line 2 and a second differential signal line 3 connected to the differential signal interface 1, the first differential signal line 2 and the second differential signal line At least one gas discharge tube 4 connected in series with the differential signal interface 1 is arranged between the lines 3, the first differential signal line 2 and the second differential signal line 3 are provided with a resistor 5, the first differential signal line 2 and the second differential signal line A transient voltage suppressor 6 connected in parallel with the differential signal interface 1 is provided between the differential signal lines 3 .
Embodiment 3
[0018] Embodiment 3: The difference from other embodiments is that the gas discharge tube 4 is a ceramic gas discharge tube, which can prolong the service life of the gas discharge tube.
[0019] The so-called gas discharge tube 4 in the present invention includes a diode and a triode, and the voltage range is from 75V to 3500V. It is used for the first or first two stages in the multi-level protection circuit and is a common discharge tube on the market.
[0020] The so-called transient voltage suppressor 6 in the present invention is a high-efficiency protection device in the form of a diode. When the transient voltage suppressor 6 diode is subjected to an instantaneous high-energy impact, it can turn it off at a speed of 10 seconds to 20 seconds. The high impedance between the two poles becomes low impedance, absorbing surge power of several thousand watts, making the voltage box between the two poles at a predetermined value, effectively protecting the precision components ...
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