A weed inactivation device has at least two electrodes, whereby at least oneelectrode is directed to the weed. The weed activation device is used as aphysicalherbicide apparatus. A DC or AC power supply of any number of phases generatesavoltage. This voltage is fed to an inverter that increases frequency. Thecurrent withincreased frequency is fed to a harmonic filter. The harmonic filter may feeda highfrequency transformer that further increases the voltage input for the voltagemultiplier.The output of the previous components is fed to a voltage multiplier, such asa voltagemultiplier of the Cockroft-Walton type or a full wave Cockroft-Walten type.Thevoltage multiplier provides different voltage levels depending on its load, sofor avariable load it makes an auto-adjustable power control without any additionalcircuitry,processor or controller necessity.
