Anti-thunder and anti-surge circuit

Abstract

The invention discloses an anti-thunder and anti-surge circuit, and relates to the technical field of lightning protection; the anti-thunder and anti-surge circuit comprises an anti-thunder circuit which is bridged between a live line and a null line of a power supply and is used for restraining lightning surge, and an anti-surge circuit which is arranged behind the anti-thunder circuit and is used for restraining continuous surge and further restraining lightning stroke residual voltage; the anti-surge circuit comprises a bridge type rectifier and a wave-eliminating circuit, wherein the inputof the bridge type rectifier is connected to the two ends of the power supply in a bridging mode; and the wave-eliminating circuit is bridged at the output end of the bridge type rectifier and is used for providing fast energy storage and discharging functions. The anti-thunder and anti-surge circuit with the current limiting function and capable of absorbing continuous surge can achieve the lightning protection effect of 12 kV, and in addition, the service life of an anti-thunder and anti-surge device is effectively prolonged, and the long-term reliability of the anti-thunder and anti-surgecircuit is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of lightning protection, in particular to a lightning protection and surge protection circuit. Background technique [0002] LED light sources have the advantages of low power consumption, long life, various optional color temperatures, and optional appearance, so they are widely used in indoor and outdoor lighting and decoration. Although the service life of the LED light source is particularly long, the overvoltage and overcurrent resistance of the LED light source is particularly weak, so the requirements for the lightning protection and surge protection of the LED drive power supply are particularly high. Especially when used outdoors, because the replacement cost is particularly high, improving the service life of the protection circuit itself has become one of the keys to the reliability of the power supply. [0003] Varistors and gas discharge tubes, which are commonly used lightning protection compo...

AI Technical Summary

Problems solved by technology

[0005] The patent No. is that a kind of external 12kV lightning protection circuit announced by CN202190073U has adopted 4 grades of lightning protection circuits (see figure 1 ), the circuit is connected with components such as inductors and capacitors, but it only connects inductors between the 2nd and 3rd lightning protection circuits, and the capacitors are directly connected in parallel with the AC power supply, which is a small capacitor, so the inductance and capacitance are only It can be used to absorb the peak voltage generated by the gas discharge tube due to unresponsiveness and intermittent conduction. It has no current limiting and anti-surge capabilities, so although this circuit has a good lightning protection effect, it cannot prolong the voltage of the varistor. Service Life and Effect of Absorbing Continuous Surge Voltage

[0006] The characteristics of the varistor are: the instantaneous absorbed power is extremely large (such as 470V / 14D, up to 3500KW instantaneously), but the average absorbed power Pw is extremely small (the average absorbed power of 470V / 14D≤0.8W). When there are electrical equipment with sudden changes in current such as impact drills and electric welding machines, the power transformer will generate corresponding continuous peak voltages (surges), and the average power of this surge often greatly exceeds the average absorbed power Pw of the varistor. , it is very easy to cause premature aging or breakdown of the varistor, resulting in failure of lightning protection and damage to the power supply

Images