Patent ID: 8227989
Filing Date: 2012-07-24
Classification: H01J,H01T

Abstract:
1. A discharge element and a control circuit for protection surge, comprising: an airtight cylinder formed with a ceramic insulation material, a pair of discharge electrodes arranged for facing an end opening of the airtight cylinder, a discharge gap formed between the pair of discharge electrodes, a discharge-assisting material filled inside the airtight cylinder, a discharge-control electrode in contact with the airtight cylinder and physically separated from the discharge-assisting material and a control circuit comprising a high voltage transformer, wherein a terminal A of the pair of discharge electrodes in the discharge element having a discharge-control electrode is connected to a terminal of a primary side of the high voltage transformer, and another terminal of the primary side of the high voltage transformer and a terminal of a secondary side of the high voltage transformer is connected to another terminal B of the pair of discharge electrodes, and another terminal of the secondary side of the high voltage transformer is connected to a terminal of the discharge-control electrode in the discharge element, wherein the discharge-control electrode is formed with a metal line, metal foil or metal piece, and a metal material of the metal line, metal foil or metal piece and a ceramic insulation material that forms an outside of the airtight cylinder are closely contacted in a line or surface, and a discharge between the pair of discharge electrodes is induced by a control voltage applied through the discharge-control electrode, wherein the discharge-control electrode is adapted to receive boosted voltage from the high voltage transformer as a result of excessive voltage including surge applied to the discharge electrode.